widl: Properly align name table entries.

[wine.git] / dlls / comctl32 / edit.c

/*
 *      Edit control
 *
 *      Copyright  David W. Metcalfe, 1994
 *      Copyright  William Magro, 1995, 1996
 *      Copyright  Frans van Dorsselaer, 1996, 1997
 *      Copyright  Frank Richter, 2005
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * TODO:
 *   - EDITBALLOONTIP structure
 *   - EM_HIDEBALLOONTIP/Edit_HideBalloonTip
 *   - EM_SHOWBALLOONTIP/Edit_ShowBalloonTip
 *   - EN_ALIGN_LTR_EC
 *   - EN_ALIGN_RTL_EC
 *   - ES_OEMCONVERT
 *
 */

#include <stdarg.h>
#include <string.h>
#include <stdlib.h>

#include "windef.h"
#include "winbase.h"
#include "winnt.h"
#include "wingdi.h"
#include "imm.h"
#include "usp10.h"
#include "commctrl.h"
#include "uxtheme.h"
#include "vsstyle.h"
#include "comctl32.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(edit);

#define BUFLIMIT_INITIAL    30000   /* initial buffer size */
#define GROWLENGTH              32      /* buffers granularity in bytes: must be power of 2 */
#define ROUND_TO_GROW(size)     (((size) + (GROWLENGTH - 1)) & ~(GROWLENGTH - 1))
#define HSCROLL_FRACTION        3       /* scroll window by 1/3 width */

/*
 *      extra flags for EDITSTATE.flags field
 */
#define EF_MODIFIED             0x0001  /* text has been modified */
#define EF_FOCUSED              0x0002  /* we have input focus */
#define EF_UPDATE               0x0004  /* notify parent of changed state */
#define EF_VSCROLL_TRACK        0x0008  /* don't SetScrollPos() since we are tracking the thumb */
#define EF_HSCROLL_TRACK        0x0010  /* don't SetScrollPos() since we are tracking the thumb */
#define EF_AFTER_WRAP           0x0080  /* the caret is displayed after the last character of a
                                           wrapped line, instead of in front of the next character */
#define EF_USE_SOFTBRK          0x0100  /* Enable soft breaks in text. */
#define EF_DIALOGMODE           0x0200  /* Indicates that we are inside a dialog window */

#define ID_CB_LISTBOX 1000

typedef enum
{
        END_0 = 0,                      /* line ends with terminating '\0' character */
        END_WRAP,                       /* line is wrapped */
        END_HARD,                       /* line ends with a hard return '\r\n' */
        END_SOFT,                       /* line ends with a soft return '\r\r\n' */
        END_RICH                        /* line ends with a single '\n' */
} LINE_END;

typedef struct tagLINEDEF {
        INT length;                     /* bruto length of a line in bytes */
        INT net_length;                 /* netto length of a line in visible characters */
        LINE_END ending;
        INT width;                      /* width of the line in pixels */
        INT index;                      /* line index into the buffer */
        SCRIPT_STRING_ANALYSIS ssa;     /* Uniscribe Data */
        struct tagLINEDEF *next;
} LINEDEF;

typedef struct
{
        LPWSTR text;                    /* the actual contents of the control */
        UINT text_length;               /* cached length of text buffer (in WCHARs) - use get_text_length() to retrieve */
        UINT buffer_size;               /* the size of the buffer in characters */
        UINT buffer_limit;              /* the maximum size to which the buffer may grow in characters */
        HFONT font;                     /* NULL means standard system font */
        INT x_offset;                   /* scroll offset        for multi lines this is in pixels
                                                                for single lines it's in characters */
        INT line_height;                /* height of a screen line in pixels */
        INT char_width;                 /* average character width in pixels */
        DWORD style;                    /* sane version of wnd->dwStyle */
        WORD flags;                     /* flags that are not in es->style or wnd->flags (EF_XXX) */
        INT undo_insert_count;          /* number of characters inserted in sequence */
        UINT undo_position;             /* character index of the insertion and deletion */
        LPWSTR undo_text;               /* deleted text */
        UINT undo_buffer_size;          /* size of the deleted text buffer */
        INT selection_start;            /* == selection_end if no selection */
        INT selection_end;              /* == current caret position */
        WCHAR password_char;            /* == 0 if no password char, and for multi line controls */
        INT left_margin;                /* in pixels */
        INT right_margin;               /* in pixels */
        RECT format_rect;
        INT text_width;                 /* width of the widest line in pixels for multi line controls
                                           and just line width for single line controls */
        EDITWORDBREAKPROCW word_break_proc;
        INT line_count;                 /* number of lines */
        INT y_offset;                   /* scroll offset in number of lines */
        BOOL bCaptureState;             /* flag indicating whether mouse was captured */
        BOOL bEnableState;              /* flag keeping the enable state */
        HWND hwndSelf;                  /* the our window handle */
        HWND hwndParent;                /* Handle of parent for sending EN_* messages.
                                           Even if parent will change, EN_* messages
                                           should be sent to the first parent. */
        HWND hwndListBox;               /* handle of ComboBox's listbox or NULL */
        INT wheelDeltaRemainder;        /* scroll wheel delta left over after scrolling whole lines */
        WCHAR *cue_banner_text;
        BOOL cue_banner_draw_focused;

        /*
         *      only for multi line controls
         */
        INT lock_count;                 /* amount of re-entries in the EditWndProc */
        INT tabs_count;
        LPINT tabs;
        LINEDEF *first_line_def;        /* linked list of (soft) linebreaks */
        HLOCAL hloc32W;                 /* our unicode local memory block */
        HLOCAL hlocapp;                 /* The text buffer handle belongs to the app */
        /*
         * IME Data
         */
        UINT ime_status;        /* IME status flag */

        /*
         * Uniscribe Data
         */
        SCRIPT_LOGATTR *logAttr;
        SCRIPT_STRING_ANALYSIS ssa; /* Uniscribe Data for single line controls */
} EDITSTATE;


#define SWAP_UINT32(x,y) do { UINT temp = (UINT)(x); (x) = (UINT)(y); (y) = temp; } while(0)
#define ORDER_UINT(x,y) do { if ((UINT)(y) < (UINT)(x)) SWAP_UINT32((x),(y)); } while(0)

static inline BOOL notify_parent(const EDITSTATE *es, INT code)
{
    HWND hwnd = es->hwndSelf;
    TRACE("notification %d sent to %p.\n", code, es->hwndParent);
    SendMessageW(es->hwndParent, WM_COMMAND, MAKEWPARAM(GetWindowLongPtrW(es->hwndSelf, GWLP_ID), code), (LPARAM)es->hwndSelf);
    return IsWindow(hwnd);
}

static LRESULT EDIT_EM_PosFromChar(EDITSTATE *es, INT index, BOOL after_wrap);

/*********************************************************************
 *
 *      EM_CANUNDO
 *
 */
static inline BOOL EDIT_EM_CanUndo(const EDITSTATE *es)
{
        return (es->undo_insert_count || lstrlenW(es->undo_text));
}


/*********************************************************************
 *
 *      EM_EMPTYUNDOBUFFER
 *
 */
static inline void EDIT_EM_EmptyUndoBuffer(EDITSTATE *es)
{
        es->undo_insert_count = 0;
        *es->undo_text = '\0';
}

static HBRUSH EDIT_NotifyCtlColor(EDITSTATE *es, HDC hdc)
{
    HBRUSH hbrush;
    UINT msg;

    if ((!es->bEnableState || (es->style & ES_READONLY)))
        msg = WM_CTLCOLORSTATIC;
    else
        msg = WM_CTLCOLOREDIT;

    /* Why do we notify to es->hwndParent, and we send this one to GetParent()? */
    hbrush = (HBRUSH)SendMessageW(GetParent(es->hwndSelf), msg, (WPARAM)hdc, (LPARAM)es->hwndSelf);
    if (!hbrush)
        hbrush = (HBRUSH)DefWindowProcW(GetParent(es->hwndSelf), msg, (WPARAM)hdc, (LPARAM)es->hwndSelf);
    return hbrush;
}


static inline UINT get_text_length(EDITSTATE *es)
{
    if(es->text_length == (UINT)-1)
        es->text_length = lstrlenW(es->text);
    return es->text_length;
}


/*********************************************************************
 *
 *      EDIT_WordBreakProc
 *
 *      Find the beginning of words.
 *      Note:   unlike the specs for a WordBreakProc, this function can
 *              only be called without linebreaks between s[0] up to
 *              s[count - 1].  Remember it is only called
 *              internally, so we can decide this for ourselves.
 *              Additionally we will always be breaking the full string.
 *
 */
static INT EDIT_WordBreakProc(EDITSTATE *es, LPWSTR s, INT index, INT count, INT action)
{
    INT ret = 0;

    TRACE("s=%p, index=%d, count=%d, action=%d\n", s, index, count, action);

    if(!s) return 0;

    if (!es->logAttr)
    {
        SCRIPT_ANALYSIS psa;

        memset(&psa,0,sizeof(SCRIPT_ANALYSIS));
        psa.eScript = SCRIPT_UNDEFINED;

        es->logAttr = Alloc(sizeof(SCRIPT_LOGATTR) * get_text_length(es));
        ScriptBreak(es->text, get_text_length(es), &psa, es->logAttr);
    }

    switch (action) {
    case WB_LEFT:
        if (index)
            index--;
        while (index && !es->logAttr[index].fSoftBreak)
            index--;
        ret = index;
        break;
    case WB_RIGHT:
        if (!count)
            break;
        while (index < count && s[index] && !es->logAttr[index].fSoftBreak)
            index++;
        ret = index;
        break;
    case WB_ISDELIMITER:
        ret = es->logAttr[index].fWhiteSpace;
        break;
    default:
        ERR("unknown action code, please report !\n");
        break;
    }
    return ret;
}


/*********************************************************************
 *
 *      EDIT_CallWordBreakProc
 *
 *      Call appropriate WordBreakProc (internal or external).
 *
 *      Note: The "start" argument should always be an index referring
 *              to es->text.  The actual wordbreak proc might be
 *              16 bit, so we can't always pass any 32 bit LPSTR.
 *              Hence we assume that es->text is the buffer that holds
 *              the string under examination (we can decide this for ourselves).
 *
 */
static INT EDIT_CallWordBreakProc(EDITSTATE *es, INT start, INT index, INT count, INT action)
{
    INT ret;

    if (es->word_break_proc)
        ret = es->word_break_proc(es->text + start, index, count, action);
    else
        ret = EDIT_WordBreakProc(es, es->text, index + start, count + start, action) - start;

    return ret;
}

static inline void EDIT_InvalidateUniscribeData_linedef(LINEDEF *line_def)
{
        if (line_def->ssa)
        {
                ScriptStringFree(&line_def->ssa);
                line_def->ssa = NULL;
        }
}

static inline void EDIT_InvalidateUniscribeData(EDITSTATE *es)
{
        LINEDEF *line_def = es->first_line_def;
        while (line_def)
        {
                EDIT_InvalidateUniscribeData_linedef(line_def);
                line_def = line_def->next;
        }
        if (es->ssa)
        {
                ScriptStringFree(&es->ssa);
                es->ssa = NULL;
        }
}

static SCRIPT_STRING_ANALYSIS EDIT_UpdateUniscribeData_linedef(EDITSTATE *es, HDC dc, LINEDEF *line_def)
{
        if (!line_def)
                return NULL;

        if (line_def->net_length && !line_def->ssa)
        {
                int index = line_def->index;
                HFONT old_font = NULL;
                HDC udc = dc;
                SCRIPT_TABDEF tabdef;
                HRESULT hr;

                if (!udc)
                        udc = GetDC(es->hwndSelf);
                if (es->font)
                        old_font = SelectObject(udc, es->font);

                tabdef.cTabStops = es->tabs_count;
                tabdef.iScale = GdiGetCharDimensions(udc, NULL, NULL);
                tabdef.pTabStops = es->tabs;
                tabdef.iTabOrigin = 0;

                hr = ScriptStringAnalyse(udc, &es->text[index], line_def->net_length,
                                         (1.5*line_def->net_length+16), -1,
                                         SSA_LINK|SSA_FALLBACK|SSA_GLYPHS|SSA_TAB, -1,
                                         NULL, NULL, NULL, &tabdef, NULL, &line_def->ssa);
                if (FAILED(hr))
                {
                        WARN("ScriptStringAnalyse failed, hr %#lx.\n", hr);
                        line_def->ssa = NULL;
                }

                if (es->font)
                        SelectObject(udc, old_font);
                if (udc != dc)
                        ReleaseDC(es->hwndSelf, udc);
        }

        return line_def->ssa;
}

static SCRIPT_STRING_ANALYSIS EDIT_UpdateUniscribeData(EDITSTATE *es, HDC dc, INT line)
{
        LINEDEF *line_def;

        if (!(es->style & ES_MULTILINE))
        {
                if (!es->ssa)
                {
                        INT length = get_text_length(es);
                        HFONT old_font = NULL;
                        HDC udc = dc;

                        if (!udc)
                                udc = GetDC(es->hwndSelf);
                        if (es->font)
                                old_font = SelectObject(udc, es->font);

                        if (es->style & ES_PASSWORD)
                                ScriptStringAnalyse(udc, &es->password_char, length, (1.5*length+16), -1, SSA_LINK|SSA_FALLBACK|SSA_GLYPHS|SSA_PASSWORD, -1, NULL, NULL, NULL, NULL, NULL, &es->ssa);
                        else
                                ScriptStringAnalyse(udc, es->text, length, (1.5*length+16), -1, SSA_LINK|SSA_FALLBACK|SSA_GLYPHS, -1, NULL, NULL, NULL, NULL, NULL, &es->ssa);

                        if (es->font)
                                SelectObject(udc, old_font);
                        if (udc != dc)
                                ReleaseDC(es->hwndSelf, udc);
                }
                return es->ssa;
        }
        else
        {
                line_def = es->first_line_def;
                while (line_def && line)
                {
                        line_def = line_def->next;
                        line--;
                }

                return EDIT_UpdateUniscribeData_linedef(es,dc,line_def);
        }
}

static inline INT get_vertical_line_count(EDITSTATE *es)
{
        INT vlc = es->line_height ? (es->format_rect.bottom - es->format_rect.top) / es->line_height : 0;
        return max(1,vlc);
}

/*********************************************************************
 *
 *      EDIT_BuildLineDefs_ML
 *
 *      Build linked list of text lines.
 *      Lines can end with '\0' (last line), a character (if it is wrapped),
 *      a soft return '\r\r\n' or a hard return '\r\n'
 *
 */
static void EDIT_BuildLineDefs_ML(EDITSTATE *es, INT istart, INT iend, INT delta, HRGN hrgn)
{
        LPWSTR current_position, cp;
        INT fw;
        LINEDEF *current_line;
        LINEDEF *previous_line;
        LINEDEF *start_line;
        INT line_index = 0, nstart_line, nstart_index;
        INT line_count = es->line_count;
        INT orig_net_length;
        RECT rc;
        INT vlc;

        if (istart == iend && delta == 0)
                return;

        previous_line = NULL;
        current_line = es->first_line_def;

        /* Find starting line. istart must lie inside an existing line or
         * at the end of buffer */
        do {
                if (istart < current_line->index + current_line->length ||
                                current_line->ending == END_0)
                        break;

                previous_line = current_line;
                current_line = current_line->next;
                line_index++;
        } while (current_line);

        if (!current_line) /* Error occurred start is not inside previous buffer */
        {
                FIXME(" modification occurred outside buffer\n");
                return;
        }

        /* Remember start of modifications in order to calculate update region */
        nstart_line = line_index;
        nstart_index = current_line->index;

        /* We must start to reformat from the previous line since the modifications
         * may have caused the line to wrap upwards. */
        if (!(es->style & ES_AUTOHSCROLL) && line_index > 0)
        {
                line_index--;
                current_line = previous_line;
        }
        start_line = current_line;

        fw = es->format_rect.right - es->format_rect.left;
        current_position = es->text + current_line->index;
        vlc = get_vertical_line_count(es);
        do {
                if (current_line != start_line)
                {
                        if (!current_line || current_line->index + delta > current_position - es->text)
                        {
                                /* The buffer has been expanded, create a new line and
                                   insert it into the link list */
                                LINEDEF *new_line = Alloc(sizeof(*new_line));
                                new_line->next = previous_line->next;
                                previous_line->next = new_line;
                                current_line = new_line;
                                es->line_count++;
                        }
                        else if (current_line->index + delta < current_position - es->text)
                        {
                                /* The previous line merged with this line so we delete this extra entry */
                                previous_line->next = current_line->next;
                                Free(current_line);
                                current_line = previous_line->next;
                                es->line_count--;
                                continue;
                        }
                        else /* current_line->index + delta == current_position */
                        {
                                if (current_position - es->text > iend)
                                        break; /* We reached end of line modifications */
                                /* else recalculate this line */
                        }
                }

                current_line->index = current_position - es->text;
                orig_net_length = current_line->net_length;

                /* Find end of line */
                cp = current_position;
                while (*cp) {
                    if (*cp == '\n') break;
                    if ((*cp == '\r') && (*(cp + 1) == '\n'))
                        break;
                    cp++;
                }

                /* Mark type of line termination */
                if (!(*cp)) {
                        current_line->ending = END_0;
                        current_line->net_length = lstrlenW(current_position);
                } else if ((cp > current_position) && (*(cp - 1) == '\r')) {
                        current_line->ending = END_SOFT;
                        current_line->net_length = cp - current_position - 1;
                } else if (*cp == '\n') {
                        current_line->ending = END_RICH;
                        current_line->net_length = cp - current_position;
                } else {
                        current_line->ending = END_HARD;
                        current_line->net_length = cp - current_position;
                }

                if (current_line->net_length)
                {
                        const SIZE *sz;
                        EDIT_InvalidateUniscribeData_linedef(current_line);
                        EDIT_UpdateUniscribeData_linedef(es, NULL, current_line);
                        if (current_line->ssa)
                        {
                                sz = ScriptString_pSize(current_line->ssa);
                                /* Calculate line width */
                                current_line->width = sz->cx;
                        }
                        else current_line->width = es->char_width * current_line->net_length;
                }
                else current_line->width = 0;

                /* FIXME: check here for lines that are too wide even in AUTOHSCROLL (> 32767 ???) */

/* Line breaks just look back from the end and find the next break and try that. */

                if (!(es->style & ES_AUTOHSCROLL)) {
                   if (current_line->width > fw && fw > es->char_width) {

                        INT prev, next;
                        int w;
                        const SIZE *sz;
                        float d;

                        prev = current_line->net_length - 1;
                        w = current_line->net_length;
                        d = (float)current_line->width/(float)fw;
                        if (d > 1.2f) d -= 0.2f;
                        next = prev/d;
                        if (next >= prev) next = prev-1;
                        do {
                                prev = EDIT_CallWordBreakProc(es, current_position - es->text,
                                                next, current_line->net_length, WB_LEFT);
                                current_line->net_length = prev;
                                EDIT_InvalidateUniscribeData_linedef(current_line);
                                EDIT_UpdateUniscribeData_linedef(es, NULL, current_line);
                                if (current_line->ssa)
                                        sz = ScriptString_pSize(current_line->ssa);
                                else sz = 0;
                                if (sz)
                                        current_line->width = sz->cx;
                                else
                                        prev = 0;
                                next = prev - 1;
                        } while (prev && current_line->width > fw);
                        current_line->net_length = w;

                        if (prev == 0) { /* Didn't find a line break so force a break */
                                INT *piDx;
                                const INT *count;

                                EDIT_InvalidateUniscribeData_linedef(current_line);
                                EDIT_UpdateUniscribeData_linedef(es, NULL, current_line);

                                if (current_line->ssa)
                                {
                                        count = ScriptString_pcOutChars(current_line->ssa);
                                        piDx = Alloc(sizeof(INT) * (*count));
                                        ScriptStringGetLogicalWidths(current_line->ssa,piDx);

                                        prev = current_line->net_length-1;
                                        do {
                                                current_line->width -= piDx[prev];
                                                prev--;
                                        } while ( prev > 0 && current_line->width > fw);
                                        if (prev<=0)
                                                prev = 1;
                                        Free(piDx);
                                }
                                else
                                        prev = (fw / es->char_width);
                        }

                        /* If the first line we are calculating, wrapped before istart, we must
                         * adjust istart in order for this to be reflected in the update region. */
                        if (current_line->index == nstart_index && istart > current_line->index + prev)
                                istart = current_line->index + prev;
                        /* else if we are updating the previous line before the first line we
                         * are re-calculating and it expanded */
                        else if (current_line == start_line &&
                                        current_line->index != nstart_index && orig_net_length < prev)
                        {
                          /* Line expanded due to an upwards line wrap so we must partially include
                           * previous line in update region */
                                nstart_line = line_index;
                                nstart_index = current_line->index;
                                istart = current_line->index + orig_net_length;
                        }

                        current_line->net_length = prev;
                        current_line->ending = END_WRAP;

                        if (current_line->net_length > 0)
                        {
                                EDIT_UpdateUniscribeData_linedef(es, NULL, current_line);
                                if (current_line->ssa)
                                {
                                        sz = ScriptString_pSize(current_line->ssa);
                                        current_line->width = sz->cx;
                                }
                                else
                                        current_line->width = 0;
                        }
                        else current_line->width = 0;
                    }
                    else if (current_line == start_line &&
                             current_line->index != nstart_index &&
                             orig_net_length < current_line->net_length) {
                        /* The previous line expanded but it's still not as wide as the client rect */
                        /* The expansion is due to an upwards line wrap so we must partially include
                           it in the update region */
                        nstart_line = line_index;
                        nstart_index = current_line->index;
                        istart = current_line->index + orig_net_length;
                    }
                }


                /* Adjust length to include line termination */
                switch (current_line->ending) {
                case END_SOFT:
                        current_line->length = current_line->net_length + 3;
                        break;
                case END_RICH:
                        current_line->length = current_line->net_length + 1;
                        break;
                case END_HARD:
                        current_line->length = current_line->net_length + 2;
                        break;
                case END_WRAP:
                case END_0:
                        current_line->length = current_line->net_length;
                        break;
                }
                es->text_width = max(es->text_width, current_line->width);
                current_position += current_line->length;
                previous_line = current_line;

                /* Discard data for non-visible lines. It will be calculated as needed */
                if ((line_index < es->y_offset) || (line_index > es->y_offset + vlc))
                        EDIT_InvalidateUniscribeData_linedef(current_line);

                current_line = current_line->next;
                line_index++;
        } while (previous_line->ending != END_0);

        /* Finish adjusting line indexes by delta or remove hanging lines */
        if (previous_line->ending == END_0)
        {
                LINEDEF *pnext = NULL;

                previous_line->next = NULL;
                while (current_line)
                {
                        pnext = current_line->next;
                        EDIT_InvalidateUniscribeData_linedef(current_line);
                        Free(current_line);
                        current_line = pnext;
                        es->line_count--;
                }
        }
        else if (delta != 0)
        {
                while (current_line)
                {
                        current_line->index += delta;
                        current_line = current_line->next;
                }
        }

        /* Calculate rest of modification rectangle */
        if (hrgn)
        {
                HRGN tmphrgn;
           /*
                * We calculate two rectangles. One for the first line which may have
                * an indent with respect to the format rect. The other is a format-width
                * rectangle that spans the rest of the lines that changed or moved.
                */
                rc.top = es->format_rect.top + nstart_line * es->line_height -
                        (es->y_offset * es->line_height); /* Adjust for vertical scrollbar */
                rc.bottom = rc.top + es->line_height;
                if ((es->style & ES_CENTER) || (es->style & ES_RIGHT))
                        rc.left = es->format_rect.left;
                else
                        rc.left = LOWORD(EDIT_EM_PosFromChar(es, nstart_index, FALSE));
                rc.right = es->format_rect.right;
                SetRectRgn(hrgn, rc.left, rc.top, rc.right, rc.bottom);

                rc.top = rc.bottom;
                rc.left = es->format_rect.left;
                rc.right = es->format_rect.right;
           /*
                * If lines were added or removed we must re-paint the remainder of the
            * lines since the remaining lines were either shifted up or down.
                */
                if (line_count < es->line_count) /* We added lines */
                        rc.bottom = es->line_count * es->line_height;
                else if (line_count > es->line_count) /* We removed lines */
                        rc.bottom = line_count * es->line_height;
                else
                        rc.bottom = line_index * es->line_height;
                rc.bottom += es->format_rect.top;
                rc.bottom -= (es->y_offset * es->line_height); /* Adjust for vertical scrollbar */
                tmphrgn = CreateRectRgn(rc.left, rc.top, rc.right, rc.bottom);
                CombineRgn(hrgn, hrgn, tmphrgn, RGN_OR);
                DeleteObject(tmphrgn);
        }
}

/*********************************************************************
 *
 *      EDIT_CalcLineWidth_SL
 *
 */
static void EDIT_CalcLineWidth_SL(EDITSTATE *es)
{
        EDIT_UpdateUniscribeData(es, NULL, 0);
        if (es->ssa)
        {
                const SIZE *size;
                size = ScriptString_pSize(es->ssa);
                es->text_width = size->cx;
        }
        else
                es->text_width = 0;
}

/*********************************************************************
 *
 *      EDIT_CharFromPos
 *
 *      Beware: This is not the function called on EM_CHARFROMPOS
 *              The position _can_ be outside the formatting / client
 *              rectangle
 *              The return value is only the character index
 *
 */
static INT EDIT_CharFromPos(EDITSTATE *es, INT x, INT y, LPBOOL after_wrap)
{
        INT index;

        if (es->style & ES_MULTILINE) {
                int trailing;
                INT line = (y - es->format_rect.top) / es->line_height + es->y_offset;
                INT line_index = 0;
                LINEDEF *line_def = es->first_line_def;
                EDIT_UpdateUniscribeData(es, NULL, line);
                while ((line > 0) && line_def->next) {
                        line_index += line_def->length;
                        line_def = line_def->next;
                        line--;
                }

                x += es->x_offset - es->format_rect.left;
                if (es->style & ES_RIGHT)
                        x -= (es->format_rect.right - es->format_rect.left) - line_def->width;
                else if (es->style & ES_CENTER)
                        x -= ((es->format_rect.right - es->format_rect.left) - line_def->width) / 2;
                if (x >= line_def->width) {
                        if (after_wrap)
                                *after_wrap = (line_def->ending == END_WRAP);
                        return line_index + line_def->net_length;
                }
                if (x <= 0 || !line_def->ssa) {
                        if (after_wrap)
                                *after_wrap = FALSE;
                        return line_index;
                }

                ScriptStringXtoCP(line_def->ssa, x , &index, &trailing);
                if (trailing) index++;
                index += line_index;
                if (after_wrap)
                        *after_wrap = ((index == line_index + line_def->net_length) &&
                                                        (line_def->ending == END_WRAP));
        } else {
                INT xoff = 0;
                INT trailing;
                if (after_wrap)
                        *after_wrap = FALSE;
                x -= es->format_rect.left;
                if (!x)
                        return es->x_offset;

                if (!es->x_offset)
                {
                        INT indent = (es->format_rect.right - es->format_rect.left) - es->text_width;
                        if (es->style & ES_RIGHT)
                                x -= indent;
                        else if (es->style & ES_CENTER)
                                x -= indent / 2;
                }

                EDIT_UpdateUniscribeData(es, NULL, 0);
                if (es->x_offset)
                {
                        if (es->ssa)
                        {
                                if (es->x_offset>= get_text_length(es))
                                {
                                        const SIZE *size;
                                        size = ScriptString_pSize(es->ssa);
                                        xoff = size->cx;
                                }
                                ScriptStringCPtoX(es->ssa, es->x_offset, FALSE, &xoff);
                        }
                        else
                                xoff = 0;
                }
                if (x < 0)
                {
                        if (x + xoff > 0 || !es->ssa)
                        {
                                ScriptStringXtoCP(es->ssa, x+xoff, &index, &trailing);
                                if (trailing) index++;
                        }
                        else
                                index = 0;
                }
                else
                {
                        if (x)
                        {
                                const SIZE *size = NULL;
                                if (es->ssa)
                                        size = ScriptString_pSize(es->ssa);
                                if (!size)
                                        index = 0;
                                else if (x > size->cx)
                                        index = get_text_length(es);
                                else if (es->ssa)
                                {
                                        ScriptStringXtoCP(es->ssa, x+xoff, &index, &trailing);
                                        if (trailing) index++;
                                }
                                else
                                        index = 0;
                        }
                        else
                                index = es->x_offset;
                }
        }
        return index;
}


/*********************************************************************
 *
 *      EDIT_ConfinePoint
 *
 *      adjusts the point to be within the formatting rectangle
 *      (so CharFromPos returns the nearest _visible_ character)
 *
 */
static void EDIT_ConfinePoint(const EDITSTATE *es, LPINT x, LPINT y)
{
        *x = min(max(*x, es->format_rect.left), es->format_rect.right - 1);
        *y = min(max(*y, es->format_rect.top), es->format_rect.bottom - 1);
}


/*********************************************************************
 *
 *      EM_LINEFROMCHAR
 *
 */
static INT EDIT_EM_LineFromChar(EDITSTATE *es, INT index)
{
        INT line;
        LINEDEF *line_def;

        if (!(es->style & ES_MULTILINE))
                return 0;
        if (index > (INT)get_text_length(es))
                return es->line_count - 1;
        if (index == -1)
                index = min(es->selection_start, es->selection_end);

        line = 0;
        line_def = es->first_line_def;
        index -= line_def->length;
        while ((index >= 0) && line_def->next) {
                line++;
                line_def = line_def->next;
                index -= line_def->length;
        }
        return line;
}


/*********************************************************************
 *
 *      EM_LINEINDEX
 *
 */
static INT EDIT_EM_LineIndex(const EDITSTATE *es, INT line)
{
        INT line_index;
        const LINEDEF *line_def;

        if (!(es->style & ES_MULTILINE))
                return 0;
        if (line >= es->line_count)
                return -1;

        line_index = 0;
        line_def = es->first_line_def;
        if (line == -1) {
                INT index = es->selection_end - line_def->length;
                while ((index >= 0) && line_def->next) {
                        line_index += line_def->length;
                        line_def = line_def->next;
                        index -= line_def->length;
                }
        } else {
                while (line > 0) {
                        line_index += line_def->length;
                        line_def = line_def->next;
                        line--;
                }
        }
        return line_index;
}


/*********************************************************************
 *
 *      EM_LINELENGTH
 *
 */
static INT EDIT_EM_LineLength(EDITSTATE *es, INT index)
{
        LINEDEF *line_def;

        if (!(es->style & ES_MULTILINE))
                return get_text_length(es);

        if (index == -1) {
                /* get the number of remaining non-selected chars of selected lines */
                INT32 l; /* line number */
                INT32 li; /* index of first char in line */
                INT32 count;
                l = EDIT_EM_LineFromChar(es, es->selection_start);
                /* # chars before start of selection area */
                count = es->selection_start - EDIT_EM_LineIndex(es, l);
                l = EDIT_EM_LineFromChar(es, es->selection_end);
                /* # chars after end of selection */
                li = EDIT_EM_LineIndex(es, l);
                count += li + EDIT_EM_LineLength(es, li) - es->selection_end;
                return count;
        }
        line_def = es->first_line_def;
        index -= line_def->length;
        while ((index >= 0) && line_def->next) {
                line_def = line_def->next;
                index -= line_def->length;
        }
        return line_def->net_length;
}


/*********************************************************************
 *
 *      EM_POSFROMCHAR
 *
 */
static LRESULT EDIT_EM_PosFromChar(EDITSTATE *es, INT index, BOOL after_wrap)
{
        INT len = get_text_length(es);
        INT l;
        INT li;
        INT x = 0;
        INT y = 0;
        INT w;
        INT lw;
        LINEDEF *line_def;

        index = min(index, len);
        if (es->style & ES_MULTILINE) {
                l = EDIT_EM_LineFromChar(es, index);
                EDIT_UpdateUniscribeData(es, NULL, l);

                y = (l - es->y_offset) * es->line_height;
                li = EDIT_EM_LineIndex(es, l);
                if (after_wrap && (li == index) && l) {
                        INT l2 = l - 1;
                        line_def = es->first_line_def;
                        while (l2) {
                                line_def = line_def->next;
                                l2--;
                        }
                        if (line_def->ending == END_WRAP) {
                                l--;
                                y -= es->line_height;
                                li = EDIT_EM_LineIndex(es, l);
                        }
                }

                line_def = es->first_line_def;
                while (line_def->index != li)
                        line_def = line_def->next;

                lw = line_def->width;
                w = es->format_rect.right - es->format_rect.left;
                if (line_def->ssa)
                        ScriptStringCPtoX(line_def->ssa, (index - 1) - li, TRUE, &x);
                x -= es->x_offset;

                if (es->style & ES_RIGHT)
                        x = w - (lw - x);
                else if (es->style & ES_CENTER)
                        x += (w - lw) / 2;
        } else {
                INT xoff = 0;
                INT xi = 0;
                EDIT_UpdateUniscribeData(es, NULL, 0);
                if (es->x_offset)
                {
                        if (es->ssa)
                        {
                                if (es->x_offset >= get_text_length(es))
                                {
                                        int leftover = es->x_offset - get_text_length(es);
                                        if (es->ssa)
                                        {
                                                const SIZE *size;
                                                size = ScriptString_pSize(es->ssa);
                                                xoff = size->cx;
                                        }
                                        else
                                                xoff = 0;
                                        xoff += es->char_width * leftover;
                                }
                                else
                                        ScriptStringCPtoX(es->ssa, es->x_offset, FALSE, &xoff);
                        }
                        else
                                xoff = 0;
                }
                if (index)
                {
                        if (index >= get_text_length(es))
                        {
                                if (es->ssa)
                                {
                                        const SIZE *size;
                                        size = ScriptString_pSize(es->ssa);
                                        xi = size->cx;
                                }
                                else
                                        xi = 0;
                        }
                        else if (es->ssa)
                                ScriptStringCPtoX(es->ssa, index, FALSE, &xi);
                        else
                                xi = 0;
                }
                x = xi - xoff;

                if (index >= es->x_offset) {
                        if (!es->x_offset && (es->style & (ES_RIGHT | ES_CENTER)))
                        {
                                w = es->format_rect.right - es->format_rect.left;
                                if (w > es->text_width)
                                {
                                        if (es->style & ES_RIGHT)
                                                x += w - es->text_width;
                                        else if (es->style & ES_CENTER)
                                                x += (w - es->text_width) / 2;
                                }
                        }
                }
                y = 0;
        }
        x += es->format_rect.left;
        y += es->format_rect.top;
        return MAKELONG((INT16)x, (INT16)y);
}


/*********************************************************************
 *
 *      EDIT_GetLineRect
 *
 *      Calculates the bounding rectangle for a line from a starting
 *      column to an ending column.
 *
 */
static void EDIT_GetLineRect(EDITSTATE *es, INT line, INT scol, INT ecol, LPRECT rc)
{
        SCRIPT_STRING_ANALYSIS ssa;
        INT line_index = 0;
        INT pt1, pt2, pt3;

        if (es->style & ES_MULTILINE)
        {
                const LINEDEF *line_def = NULL;
                rc->top = es->format_rect.top + (line - es->y_offset) * es->line_height;
                if (line >= es->line_count)
                        return;

                line_def = es->first_line_def;
                if (line == -1) {
                        INT index = es->selection_end - line_def->length;
                        while ((index >= 0) && line_def->next) {
                                line_index += line_def->length;
                                line_def = line_def->next;
                                index -= line_def->length;
                        }
                } else {
                        while (line > 0) {
                                line_index += line_def->length;
                                line_def = line_def->next;
                                line--;
                        }
                }
                ssa = line_def->ssa;
        }
        else
        {
                line_index = 0;
                rc->top = es->format_rect.top;
                ssa = es->ssa;
        }

        rc->bottom = rc->top + es->line_height;
        pt1 = (scol == 0) ? es->format_rect.left : (short)LOWORD(EDIT_EM_PosFromChar(es, line_index + scol, TRUE));
        pt2 = (ecol == -1) ? es->format_rect.right : (short)LOWORD(EDIT_EM_PosFromChar(es, line_index + ecol, TRUE));
        if (ssa)
        {
                ScriptStringCPtoX(ssa, scol, FALSE, &pt3);
                pt3+=es->format_rect.left;
        }
        else pt3 = pt1;
        rc->right = max(max(pt1 , pt2),pt3);
        rc->left = min(min(pt1, pt2),pt3);
}


static inline void text_buffer_changed(EDITSTATE *es)
{
    es->text_length = (UINT)-1;

    Free(es->logAttr);
    es->logAttr = NULL;
    EDIT_InvalidateUniscribeData(es);
}

/*********************************************************************
 * EDIT_LockBuffer
 *
 */
static void EDIT_LockBuffer(EDITSTATE *es)
{
    if (!es->text)
    {
        if (!es->hloc32W)
            return;

        es->text = LocalLock(es->hloc32W);
    }

    es->lock_count++;
}


/*********************************************************************
 *
 *      EDIT_UnlockBuffer
 *
 */
static void EDIT_UnlockBuffer(EDITSTATE *es, BOOL force)
{
    /* Edit window might be already destroyed */
    if (!IsWindow(es->hwndSelf))
    {
        WARN("edit hwnd %p already destroyed\n", es->hwndSelf);
        return;
    }

    if (!es->lock_count)
    {
        ERR("lock_count == 0 ... please report\n");
        return;
    }

    if (!es->text)
    {
        ERR("es->text == 0 ... please report\n");
        return;
    }

    if (force || (es->lock_count == 1))
    {
        if (es->hloc32W)
        {
            LocalUnlock(es->hloc32W);
            es->text = NULL;
        }
        else
        {
            ERR("no buffer ... please report\n");
            return;
        }

    }

    es->lock_count--;
}


/*********************************************************************
 *
 *      EDIT_MakeFit
 *
 * Try to fit size + 1 characters in the buffer.
 */
static BOOL EDIT_MakeFit(EDITSTATE *es, UINT size)
{
        HLOCAL hNew32W;

        if (size <= es->buffer_size)
                return TRUE;

        TRACE("trying to ReAlloc to %d+1 characters\n", size);

        /* Force edit to unlock its buffer. es->text now NULL */
        EDIT_UnlockBuffer(es, TRUE);

        if (es->hloc32W) {
            UINT alloc_size = ROUND_TO_GROW((size + 1) * sizeof(WCHAR));
            if ((hNew32W = LocalReAlloc(es->hloc32W, alloc_size, LMEM_MOVEABLE | LMEM_ZEROINIT))) {
                TRACE("Old 32 bit handle %p, new handle %p\n", es->hloc32W, hNew32W);
                es->hloc32W = hNew32W;
                es->buffer_size = LocalSize(hNew32W)/sizeof(WCHAR) - 1;
            }
        }

        EDIT_LockBuffer(es);

        if (es->buffer_size < size) {
                WARN("FAILED !  We now have %d+1\n", es->buffer_size);
                notify_parent(es, EN_ERRSPACE);
                return FALSE;
        } else {
                TRACE("We now have %d+1\n", es->buffer_size);
                return TRUE;
        }
}


/*********************************************************************
 *
 *      EDIT_MakeUndoFit
 *
 *      Try to fit size + 1 bytes in the undo buffer.
 *
 */
static BOOL EDIT_MakeUndoFit(EDITSTATE *es, UINT size)
{
        UINT alloc_size;
        WCHAR *new_undo_text;

        if (size <= es->undo_buffer_size)
                return TRUE;

        TRACE("trying to ReAlloc to %d+1\n", size);

        alloc_size = ROUND_TO_GROW((size + 1) * sizeof(WCHAR));
        if ((new_undo_text = ReAlloc(es->undo_text, alloc_size))) {
                memset(new_undo_text + es->undo_buffer_size, 0, alloc_size - es->undo_buffer_size * sizeof(WCHAR));
                es->undo_text = new_undo_text;
                es->undo_buffer_size = alloc_size/sizeof(WCHAR) - 1;
                return TRUE;
        }
        else
        {
                WARN("FAILED !  We now have %d+1\n", es->undo_buffer_size);
                return FALSE;
        }
}


/*********************************************************************
 *
 *      EDIT_UpdateTextRegion
 *
 */
static void EDIT_UpdateTextRegion(EDITSTATE *es, HRGN hrgn, BOOL bErase)
{
    if (es->flags & EF_UPDATE) {
        es->flags &= ~EF_UPDATE;
        if (!notify_parent(es, EN_UPDATE)) return;
    }
    InvalidateRgn(es->hwndSelf, hrgn, bErase);
}


/*********************************************************************
 *
 *      EDIT_UpdateText
 *
 */
static void EDIT_UpdateText(EDITSTATE *es, const RECT *rc, BOOL bErase)
{
    if (es->flags & EF_UPDATE) {
        es->flags &= ~EF_UPDATE;
        if (!notify_parent(es, EN_UPDATE)) return;
    }
    InvalidateRect(es->hwndSelf, rc, bErase);
}

/*********************************************************************
 *
 *      EDIT_SL_InvalidateText
 *
 *      Called from EDIT_InvalidateText().
 *      Does the job for single-line controls only.
 *
 */
static void EDIT_SL_InvalidateText(EDITSTATE *es, INT start, INT end)
{
        RECT line_rect;
        RECT rc;

        EDIT_GetLineRect(es, 0, start, end, &line_rect);
        if (IntersectRect(&rc, &line_rect, &es->format_rect))
                EDIT_UpdateText(es, &rc, TRUE);
}

/*********************************************************************
 *
 *      EDIT_ML_InvalidateText
 *
 *      Called from EDIT_InvalidateText().
 *      Does the job for multi-line controls only.
 *
 */
static void EDIT_ML_InvalidateText(EDITSTATE *es, INT start, INT end)
{
        INT vlc = get_vertical_line_count(es);
        INT sl = EDIT_EM_LineFromChar(es, start);
        INT el = EDIT_EM_LineFromChar(es, end);
        INT sc;
        INT ec;
        RECT rc1;
        RECT rcWnd;
        RECT rcLine;
        RECT rcUpdate;
        INT l;

        if ((el < es->y_offset) || (sl > es->y_offset + vlc))
                return;

        sc = start - EDIT_EM_LineIndex(es, sl);
        ec = end - EDIT_EM_LineIndex(es, el);
        if (sl < es->y_offset) {
                sl = es->y_offset;
                sc = 0;
        }
        if (el > es->y_offset + vlc) {
                el = es->y_offset + vlc;
                ec = EDIT_EM_LineLength(es, EDIT_EM_LineIndex(es, el));
        }
        GetClientRect(es->hwndSelf, &rc1);
        IntersectRect(&rcWnd, &rc1, &es->format_rect);
        if (sl == el) {
                EDIT_GetLineRect(es, sl, sc, ec, &rcLine);
                if (IntersectRect(&rcUpdate, &rcWnd, &rcLine))
                        EDIT_UpdateText(es, &rcUpdate, TRUE);
        } else {
                EDIT_GetLineRect(es, sl, sc,
                                EDIT_EM_LineLength(es,
                                        EDIT_EM_LineIndex(es, sl)),
                                &rcLine);
                if (IntersectRect(&rcUpdate, &rcWnd, &rcLine))
                        EDIT_UpdateText(es, &rcUpdate, TRUE);
                for (l = sl + 1 ; l < el ; l++) {
                        EDIT_GetLineRect(es, l, 0,
                                EDIT_EM_LineLength(es,
                                        EDIT_EM_LineIndex(es, l)),
                                &rcLine);
                        if (IntersectRect(&rcUpdate, &rcWnd, &rcLine))
                                EDIT_UpdateText(es, &rcUpdate, TRUE);
                }
                EDIT_GetLineRect(es, el, 0, ec, &rcLine);
                if (IntersectRect(&rcUpdate, &rcWnd, &rcLine))
                        EDIT_UpdateText(es, &rcUpdate, TRUE);
        }
}


/*********************************************************************
 *
 *      EDIT_InvalidateText
 *
 *      Invalidate the text from offset start up to, but not including,
 *      offset end.  Useful for (re)painting the selection.
 *      Regions outside the linewidth are not invalidated.
 *      end == -1 means end == TextLength.
 *      start and end need not be ordered.
 *
 */
static void EDIT_InvalidateText(EDITSTATE *es, INT start, INT end)
{
        if (end == start)
                return;

        if (end == -1)
                end = get_text_length(es);

        if (end < start) {
            INT tmp = start;
            start = end;
            end = tmp;
        }

        if (es->style & ES_MULTILINE)
                EDIT_ML_InvalidateText(es, start, end);
        else
                EDIT_SL_InvalidateText(es, start, end);
}


/*********************************************************************
 *
 *      EDIT_EM_SetSel
 *
 *      note:   unlike the specs say: the order of start and end
 *              _is_ preserved in Windows.  (i.e. start can be > end)
 *              In other words: this handler is OK
 *
 */
static BOOL EDIT_EM_SetSel(EDITSTATE *es, UINT start, UINT end, BOOL after_wrap)
{
        UINT old_start = es->selection_start;
        UINT old_end = es->selection_end;
        UINT len = get_text_length(es);

        if (start == old_start && end == old_end)
            return FALSE;

        if (start == (UINT)-1) {
                start = es->selection_end;
                end = es->selection_end;
        } else {
                start = min(start, len);
                end = min(end, len);
        }
        es->selection_start = start;
        es->selection_end = end;
        if (after_wrap)
                es->flags |= EF_AFTER_WRAP;
        else
                es->flags &= ~EF_AFTER_WRAP;
        /* Compute the necessary invalidation region. */
        /* Note that we don't need to invalidate regions which have
         * "never" been selected, or those which are "still" selected.
         * In fact, every time we hit a selection boundary, we can
         * *toggle* whether we need to invalidate.  Thus we can optimize by
         * *sorting* the interval endpoints.  Let's assume that we sort them
         * in this order:
         *        start <= end <= old_start <= old_end
         * Knuth 5.3.1 (p 183) assures us that this can be done optimally
         * in 5 comparisons; i.e. it is impossible to do better than the
         * following: */
        ORDER_UINT(end, old_end);
        ORDER_UINT(start, old_start);
        ORDER_UINT(old_start, old_end);
        ORDER_UINT(start, end);
        /* Note that at this point 'end' and 'old_start' are not in order, but
         * start is definitely the min. and old_end is definitely the max. */
        if (end != old_start)
        {
/*
 * One can also do
 *          ORDER_UINT32(end, old_start);
 *          EDIT_InvalidateText(es, start, end);
 *          EDIT_InvalidateText(es, old_start, old_end);
 * in place of the following if statement.
 * (That would complete the optimal five-comparison four-element sort.)
 */
            if (old_start > end )
            {
                EDIT_InvalidateText(es, start, end);
                EDIT_InvalidateText(es, old_start, old_end);
            }
            else
            {
                EDIT_InvalidateText(es, start, old_start);
                EDIT_InvalidateText(es, end, old_end);
            }
        }
        else EDIT_InvalidateText(es, start, old_end);

        return TRUE;
}


/*********************************************************************
 *
 *      EDIT_UpdateScrollInfo
 *
 */
static void EDIT_UpdateScrollInfo(EDITSTATE *es)
{
    if ((es->style & WS_VSCROLL) && !(es->flags & EF_VSCROLL_TRACK))
    {
        SCROLLINFO si;
        si.cbSize       = sizeof(SCROLLINFO);
        si.fMask        = SIF_PAGE | SIF_POS | SIF_RANGE | SIF_DISABLENOSCROLL;
        si.nMin         = 0;
        si.nMax         = es->line_count - 1;
        si.nPage        = es->line_height ? (es->format_rect.bottom - es->format_rect.top) / es->line_height : 0;
        si.nPos         = es->y_offset;
        TRACE("SB_VERT, nMin=%d, nMax=%d, nPage=%d, nPos=%d\n",
                si.nMin, si.nMax, si.nPage, si.nPos);
        SetScrollInfo(es->hwndSelf, SB_VERT, &si, TRUE);
    }

    if ((es->style & WS_HSCROLL) && !(es->flags & EF_HSCROLL_TRACK))
    {
        SCROLLINFO si;
        si.cbSize       = sizeof(SCROLLINFO);
        si.fMask        = SIF_PAGE | SIF_POS | SIF_RANGE | SIF_DISABLENOSCROLL;
        si.nMin         = 0;
        si.nMax         = es->text_width - 1;
        si.nPage        = es->format_rect.right - es->format_rect.left;
        si.nPos         = es->x_offset;
        TRACE("SB_HORZ, nMin=%d, nMax=%d, nPage=%d, nPos=%d\n",
                si.nMin, si.nMax, si.nPage, si.nPos);
        SetScrollInfo(es->hwndSelf, SB_HORZ, &si, TRUE);
    }
}


/*********************************************************************
 *
 *      EDIT_EM_LineScroll_internal
 *
 *      Version of EDIT_EM_LineScroll for internal use.
 *      It doesn't refuse if ES_MULTILINE is set and assumes that
 *      dx is in pixels, dy - in lines.
 *
 */
static BOOL EDIT_EM_LineScroll_internal(EDITSTATE *es, INT dx, INT dy)
{
        INT nyoff;
        INT x_offset_in_pixels;
        INT lines_per_page;

        if (!es->line_height || !es->char_width)
                return TRUE;

        lines_per_page = (es->format_rect.bottom - es->format_rect.top) / es->line_height;

        if (es->style & ES_MULTILINE)
        {
            x_offset_in_pixels = es->x_offset;
        }
        else
        {
            dy = 0;
            x_offset_in_pixels = (short)LOWORD(EDIT_EM_PosFromChar(es, es->x_offset, FALSE));
        }

        if (-dx > x_offset_in_pixels)
                dx = -x_offset_in_pixels;
        if (dx > es->text_width - x_offset_in_pixels)
                dx = es->text_width - x_offset_in_pixels;
        nyoff = max(0, es->y_offset + dy);
        if (nyoff >= es->line_count - lines_per_page)
                nyoff = max(0, es->line_count - lines_per_page);
        dy = (es->y_offset - nyoff) * es->line_height;
        if (dx || dy) {
                RECT rc1;
                RECT rc;

                es->y_offset = nyoff;
                if(es->style & ES_MULTILINE)
                    es->x_offset += dx;
                else
                    es->x_offset += dx / es->char_width;

                GetClientRect(es->hwndSelf, &rc1);
                IntersectRect(&rc, &rc1, &es->format_rect);
                ScrollWindowEx(es->hwndSelf, -dx, dy,
                                NULL, &rc, NULL, NULL, SW_INVALIDATE);
                /* force scroll info update */
                EDIT_UpdateScrollInfo(es);
        }
        if (dx && !(es->flags & EF_HSCROLL_TRACK))
                notify_parent(es, EN_HSCROLL);
        if (dy && !(es->flags & EF_VSCROLL_TRACK))
                notify_parent(es, EN_VSCROLL);
        return TRUE;
}

/*********************************************************************
 *
 *      EM_LINESCROLL
 *
 *      NOTE: dx is in average character widths, dy - in lines;
 *
 */
static BOOL EDIT_EM_LineScroll(EDITSTATE *es, INT dx, INT dy)
{
        if (!(es->style & ES_MULTILINE))
                return FALSE;

        dx *= es->char_width;
        return EDIT_EM_LineScroll_internal(es, dx, dy);
}


/*********************************************************************
 *
 *      EM_SCROLL
 *
 */
static LRESULT EDIT_EM_Scroll(EDITSTATE *es, INT action)
{
        INT dy;

        if (!(es->style & ES_MULTILINE))
                return (LRESULT)FALSE;

        dy = 0;

        switch (action) {
        case SB_LINEUP:
                if (es->y_offset)
                        dy = -1;
                break;
        case SB_LINEDOWN:
                if (es->y_offset < es->line_count - 1)
                        dy = 1;
                break;
        case SB_PAGEUP:
                if (es->y_offset)
                        dy = -(es->format_rect.bottom - es->format_rect.top) / es->line_height;
                break;
        case SB_PAGEDOWN:
                if (es->y_offset < es->line_count - 1)
                        dy = (es->format_rect.bottom - es->format_rect.top) / es->line_height;
                break;
        default:
                return (LRESULT)FALSE;
        }
        if (dy) {
            INT vlc = get_vertical_line_count(es);
            /* check if we are going to move too far */
            if(es->y_offset + dy > es->line_count - vlc)
                dy = max(es->line_count - vlc, 0) - es->y_offset;

            /* Notification is done in EDIT_EM_LineScroll */
            if(dy) {
                EDIT_EM_LineScroll(es, 0, dy);
                return MAKELONG(dy, TRUE);
            }

        }
        return (LRESULT)FALSE;
}


static void EDIT_UpdateImmCompositionWindow(EDITSTATE *es, UINT x, UINT y)
{
    COMPOSITIONFORM form =
    {
        .dwStyle = CFS_RECT,
        .ptCurrentPos = {.x = x, .y = y},
        .rcArea = es->format_rect,
    };
    HIMC himc = ImmGetContext(es->hwndSelf);
    ImmSetCompositionWindow(himc, &form);
    ImmReleaseContext(es->hwndSelf, himc);
}


/*********************************************************************
 *
 *      EDIT_SetCaretPos
 *
 */
static void EDIT_SetCaretPos(EDITSTATE *es, INT pos,
                             BOOL after_wrap)
{
    LRESULT res;

    if (es->flags & EF_FOCUSED)
    {
        res = EDIT_EM_PosFromChar(es, pos, after_wrap);
        TRACE("%d - %dx%d\n", pos, (short)LOWORD(res), (short)HIWORD(res));
        SetCaretPos((short)LOWORD(res), (short)HIWORD(res));
        EDIT_UpdateImmCompositionWindow(es, (short)LOWORD(res), (short)HIWORD(res));
    }
}


/*********************************************************************
 *
 *      EM_SCROLLCARET
 *
 */
static void EDIT_EM_ScrollCaret(EDITSTATE *es)
{
        if (es->style & ES_MULTILINE) {
                INT l;
                INT vlc;
                INT ww;
                INT cw = es->char_width;
                INT x;
                INT dy = 0;
                INT dx = 0;

                l = EDIT_EM_LineFromChar(es, es->selection_end);
                x = (short)LOWORD(EDIT_EM_PosFromChar(es, es->selection_end, es->flags & EF_AFTER_WRAP));
                vlc = get_vertical_line_count(es);
                if (l >= es->y_offset + vlc)
                        dy = l - vlc + 1 - es->y_offset;
                if (l < es->y_offset)
                        dy = l - es->y_offset;
                ww = es->format_rect.right - es->format_rect.left;
                if (x < es->format_rect.left)
                        dx = x - es->format_rect.left - ww / HSCROLL_FRACTION / cw * cw;
                if (x > es->format_rect.right)
                        dx = x - es->format_rect.left - (HSCROLL_FRACTION - 1) * ww / HSCROLL_FRACTION / cw * cw;
                if (dy || dx || (es->y_offset && (es->line_count - es->y_offset < vlc)))
                {
                    /* check if we are going to move too far */
                    if(es->x_offset + dx + ww > es->text_width)
                        dx = es->text_width - ww - es->x_offset;
                    if(dx || dy || (es->y_offset && (es->line_count - es->y_offset < vlc)))
                        EDIT_EM_LineScroll_internal(es, dx, dy);
                }
        } else {
                INT x;
                INT goal;
                INT format_width;

                x = (short)LOWORD(EDIT_EM_PosFromChar(es, es->selection_end, FALSE));
                format_width = es->format_rect.right - es->format_rect.left;
                if (x < es->format_rect.left) {
                        goal = es->format_rect.left + format_width / HSCROLL_FRACTION;
                        do {
                                es->x_offset--;
                                x = (short)LOWORD(EDIT_EM_PosFromChar(es, es->selection_end, FALSE));
                        } while ((x < goal) && es->x_offset);
                        /* FIXME: use ScrollWindow() somehow to improve performance */
                        EDIT_UpdateText(es, NULL, TRUE);
                } else if (x > es->format_rect.right) {
                        INT x_last;
                        INT len = get_text_length(es);
                        goal = es->format_rect.right - format_width / HSCROLL_FRACTION;
                        do {
                                es->x_offset++;
                                x = (short)LOWORD(EDIT_EM_PosFromChar(es, es->selection_end, FALSE));
                                x_last = (short)LOWORD(EDIT_EM_PosFromChar(es, len, FALSE));
                        } while ((x > goal) && (x_last > es->format_rect.right));
                        /* FIXME: use ScrollWindow() somehow to improve performance */
                        EDIT_UpdateText(es, NULL, TRUE);
                }
        }

        EDIT_SetCaretPos(es, es->selection_end, es->flags & EF_AFTER_WRAP);
}


/*********************************************************************
 *
 *      EDIT_MoveBackward
 *
 */
static void EDIT_MoveBackward(EDITSTATE *es, BOOL extend)
{
        INT e = es->selection_end;

        if (e) {
                e--;
                if ((es->style & ES_MULTILINE) && e &&
                                (es->text[e - 1] == '\r') && (es->text[e] == '\n')) {
                        e--;
                        if (e && (es->text[e - 1] == '\r'))
                                e--;
                }
        }
        EDIT_EM_SetSel(es, extend ? es->selection_start : e, e, FALSE);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MoveDown_ML
 *
 *      Only for multi line controls
 *      Move the caret one line down, on a column with the nearest
 *      x coordinate on the screen (might be a different column).
 *
 */
static void EDIT_MoveDown_ML(EDITSTATE *es, BOOL extend)
{
        INT s = es->selection_start;
        INT e = es->selection_end;
        BOOL after_wrap = (es->flags & EF_AFTER_WRAP);
        LRESULT pos = EDIT_EM_PosFromChar(es, e, after_wrap);
        INT x = (short)LOWORD(pos);
        INT y = (short)HIWORD(pos);

        e = EDIT_CharFromPos(es, x, y + es->line_height, &after_wrap);
        if (!extend)
                s = e;
        EDIT_EM_SetSel(es, s, e, after_wrap);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MoveEnd
 *
 */
static void EDIT_MoveEnd(EDITSTATE *es, BOOL extend, BOOL ctrl)
{
        BOOL after_wrap = FALSE;
        INT e;

        /* Pass a high value in x to make sure of receiving the end of the line */
        if (!ctrl && (es->style & ES_MULTILINE))
                e = EDIT_CharFromPos(es, 0x3fffffff,
                        HIWORD(EDIT_EM_PosFromChar(es, es->selection_end, es->flags & EF_AFTER_WRAP)), &after_wrap);
        else
                e = get_text_length(es);
        EDIT_EM_SetSel(es, extend ? es->selection_start : e, e, after_wrap);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MoveForward
 *
 */
static void EDIT_MoveForward(EDITSTATE *es, BOOL extend)
{
        INT e = es->selection_end;

        if (es->text[e]) {
                e++;
                if ((es->style & ES_MULTILINE) && (es->text[e - 1] == '\r')) {
                        if (es->text[e] == '\n')
                                e++;
                        else if ((es->text[e] == '\r') && (es->text[e + 1] == '\n'))
                                e += 2;
                }
        }
        EDIT_EM_SetSel(es, extend ? es->selection_start : e, e, FALSE);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MoveHome
 *
 *      Home key: move to beginning of line.
 *
 */
static void EDIT_MoveHome(EDITSTATE *es, BOOL extend, BOOL ctrl)
{
        INT e;

        /* Pass the x_offset in x to make sure of receiving the first position of the line */
        if (!ctrl && (es->style & ES_MULTILINE))
                e = EDIT_CharFromPos(es, -es->x_offset,
                        HIWORD(EDIT_EM_PosFromChar(es, es->selection_end, es->flags & EF_AFTER_WRAP)), NULL);
        else
                e = 0;
        EDIT_EM_SetSel(es, extend ? es->selection_start : e, e, FALSE);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MovePageDown_ML
 *
 *      Only for multi line controls
 *      Move the caret one page down, on a column with the nearest
 *      x coordinate on the screen (might be a different column).
 *
 */
static void EDIT_MovePageDown_ML(EDITSTATE *es, BOOL extend)
{
        INT s = es->selection_start;
        INT e = es->selection_end;
        BOOL after_wrap = (es->flags & EF_AFTER_WRAP);
        LRESULT pos = EDIT_EM_PosFromChar(es, e, after_wrap);
        INT x = (short)LOWORD(pos);
        INT y = (short)HIWORD(pos);

        e = EDIT_CharFromPos(es, x,
                y + (es->format_rect.bottom - es->format_rect.top),
                &after_wrap);
        if (!extend)
                s = e;
        EDIT_EM_SetSel(es, s, e, after_wrap);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MovePageUp_ML
 *
 *      Only for multi line controls
 *      Move the caret one page up, on a column with the nearest
 *      x coordinate on the screen (might be a different column).
 *
 */
static void EDIT_MovePageUp_ML(EDITSTATE *es, BOOL extend)
{
        INT s = es->selection_start;
        INT e = es->selection_end;
        BOOL after_wrap = (es->flags & EF_AFTER_WRAP);
        LRESULT pos = EDIT_EM_PosFromChar(es, e, after_wrap);
        INT x = (short)LOWORD(pos);
        INT y = (short)HIWORD(pos);

        e = EDIT_CharFromPos(es, x,
                y - (es->format_rect.bottom - es->format_rect.top),
                &after_wrap);
        if (!extend)
                s = e;
        EDIT_EM_SetSel(es, s, e, after_wrap);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MoveUp_ML
 *
 *      Only for multi line controls
 *      Move the caret one line up, on a column with the nearest
 *      x coordinate on the screen (might be a different column).
 *
 */
static void EDIT_MoveUp_ML(EDITSTATE *es, BOOL extend)
{
        INT s = es->selection_start;
        INT e = es->selection_end;
        BOOL after_wrap = (es->flags & EF_AFTER_WRAP);
        LRESULT pos = EDIT_EM_PosFromChar(es, e, after_wrap);
        INT x = (short)LOWORD(pos);
        INT y = (short)HIWORD(pos);

        e = EDIT_CharFromPos(es, x, y - es->line_height, &after_wrap);
        if (!extend)
                s = e;
        EDIT_EM_SetSel(es, s, e, after_wrap);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MoveWordBackward
 *
 */
static void EDIT_MoveWordBackward(EDITSTATE *es, BOOL extend)
{
        INT s = es->selection_start;
        INT e = es->selection_end;
        INT l;
        INT ll;
        INT li;

        l = EDIT_EM_LineFromChar(es, e);
        ll = EDIT_EM_LineLength(es, e);
        li = EDIT_EM_LineIndex(es, l);
        if (e - li == 0) {
                if (l) {
                        li = EDIT_EM_LineIndex(es, l - 1);
                        e = li + EDIT_EM_LineLength(es, li);
                }
        } else {
                e = li + EDIT_CallWordBreakProc(es, li, e - li, ll, WB_LEFT);
        }
        if (!extend)
                s = e;
        EDIT_EM_SetSel(es, s, e, FALSE);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_MoveWordForward
 *
 */
static void EDIT_MoveWordForward(EDITSTATE *es, BOOL extend)
{
        INT s = es->selection_start;
        INT e = es->selection_end;
        INT l;
        INT ll;
        INT li;

        l = EDIT_EM_LineFromChar(es, e);
        ll = EDIT_EM_LineLength(es, e);
        li = EDIT_EM_LineIndex(es, l);
        if (e - li == ll) {
                if ((es->style & ES_MULTILINE) && (l != es->line_count - 1))
                        e = EDIT_EM_LineIndex(es, l + 1);
        } else {
                e = li + EDIT_CallWordBreakProc(es,
                                li, e - li + 1, ll, WB_RIGHT);
        }
        if (!extend)
                s = e;
        EDIT_EM_SetSel(es, s, e, FALSE);
        EDIT_EM_ScrollCaret(es);
}


/*********************************************************************
 *
 *      EDIT_PaintText
 *
 */
static INT EDIT_PaintText(EDITSTATE *es, HDC dc, INT x, INT y, INT line, INT col, INT count, BOOL rev)
{
        COLORREF BkColor;
        COLORREF TextColor;
        INT ret;
        INT li;
        INT BkMode;
        SIZE size;

        if (!count)
                return 0;
        BkMode = GetBkMode(dc);
        BkColor = GetBkColor(dc);
        TextColor = GetTextColor(dc);
        if (rev) {
                SetBkColor(dc, GetSysColor(COLOR_HIGHLIGHT));
                SetTextColor(dc, GetSysColor(COLOR_HIGHLIGHTTEXT));
                SetBkMode(dc, OPAQUE);
        }
        li = EDIT_EM_LineIndex(es, line);
        if (es->style & ES_MULTILINE) {
                ret = (INT)LOWORD(TabbedTextOutW(dc, x, y, es->text + li + col, count,
                                        es->tabs_count, es->tabs, es->format_rect.left - es->x_offset));
        } else {
                TextOutW(dc, x, y, es->text + li + col, count);
                GetTextExtentPoint32W(dc, es->text + li + col, count, &size);
                ret = size.cx;
        }
        if (rev) {
                SetBkColor(dc, BkColor);
                SetTextColor(dc, TextColor);
                SetBkMode(dc, BkMode);
        }
        return ret;
}


/*********************************************************************
 *
 *      EDIT_PaintLine
 *
 */
static void EDIT_PaintLine(EDITSTATE *es, HDC dc, INT line, BOOL rev)
{
        INT s = 0;
        INT e = 0;
        INT li = 0;
        INT ll = 0;
        INT x;
        INT y;
        LRESULT pos;
        SCRIPT_STRING_ANALYSIS ssa;

        if (es->style & ES_MULTILINE) {
                INT vlc = get_vertical_line_count(es);

                if ((line < es->y_offset) || (line > es->y_offset + vlc) || (line >= es->line_count))
                        return;
        } else if (line)
                return;

        TRACE("line=%d\n", line);

        ssa = EDIT_UpdateUniscribeData(es, dc, line);
        pos = EDIT_EM_PosFromChar(es, EDIT_EM_LineIndex(es, line), FALSE);
        x = (short)LOWORD(pos);
        y = (short)HIWORD(pos);

        if (es->style & ES_MULTILINE)
        {
                int line_idx = line;
                x =  -es->x_offset;
                if (es->style & ES_RIGHT || es->style & ES_CENTER)
                {
                        LINEDEF *line_def = es->first_line_def;
                        int w, lw;

                        while (line_def && line_idx)
                        {
                                line_def = line_def->next;
                                line_idx--;
                        }
                        w = es->format_rect.right - es->format_rect.left;
                        lw = line_def->width;

                        if (es->style & ES_RIGHT)
                                x = w - (lw - x);
                        else if (es->style & ES_CENTER)
                                x += (w - lw) / 2;
                }
                x += es->format_rect.left;
        }

        if (rev)
        {
                li = EDIT_EM_LineIndex(es, line);
                ll = EDIT_EM_LineLength(es, li);
                s = min(es->selection_start, es->selection_end);
                e = max(es->selection_start, es->selection_end);
                s = min(li + ll, max(li, s));
                e = min(li + ll, max(li, e));
        }

        if (ssa)
                ScriptStringOut(ssa, x, y, 0, &es->format_rect, s - li, e - li, FALSE);
        else if (rev && (s != e) &&
                        ((es->flags & EF_FOCUSED) || (es->style & ES_NOHIDESEL))) {
                x += EDIT_PaintText(es, dc, x, y, line, 0, s - li, FALSE);
                x += EDIT_PaintText(es, dc, x, y, line, s - li, e - s, TRUE);
                x += EDIT_PaintText(es, dc, x, y, line, e - li, li + ll - e, FALSE);
        } else
                x += EDIT_PaintText(es, dc, x, y, line, 0, ll, FALSE);

       if (es->cue_banner_text && es->text_length == 0 && (!(es->flags & EF_FOCUSED) || es->cue_banner_draw_focused))
       {
               SetTextColor(dc, GetSysColor(COLOR_GRAYTEXT));
               TextOutW(dc, x, y, es->cue_banner_text, lstrlenW(es->cue_banner_text));
       }
}


/*********************************************************************
 *
 *      EDIT_AdjustFormatRect
 *
 *      Adjusts the format rectangle for the current font and the
 *      current client rectangle.
 *
 */
static void EDIT_AdjustFormatRect(EDITSTATE *es)
{
        RECT ClientRect;

        es->format_rect.right = max(es->format_rect.right, es->format_rect.left + es->char_width);
        if (es->style & ES_MULTILINE)
        {
            INT fw, vlc, max_x_offset, max_y_offset;

            vlc = get_vertical_line_count(es);
            es->format_rect.bottom = es->format_rect.top + vlc * es->line_height;

            /* correct es->x_offset */
            fw = es->format_rect.right - es->format_rect.left;
            max_x_offset = es->text_width - fw;
            if(max_x_offset < 0) max_x_offset = 0;
            if(es->x_offset > max_x_offset)
                es->x_offset = max_x_offset;

            /* correct es->y_offset */
            max_y_offset = es->line_count - vlc;
            if(max_y_offset < 0) max_y_offset = 0;
            if(es->y_offset > max_y_offset)
                es->y_offset = max_y_offset;

            /* force scroll info update */
            EDIT_UpdateScrollInfo(es);
        }
        else
        /* Windows doesn't care to fix text placement for SL controls */
                es->format_rect.bottom = es->format_rect.top + es->line_height;

        /* Always stay within the client area */
        GetClientRect(es->hwndSelf, &ClientRect);
        es->format_rect.bottom = min(es->format_rect.bottom, ClientRect.bottom);

        if ((es->style & ES_MULTILINE) && !(es->style & ES_AUTOHSCROLL))
                EDIT_BuildLineDefs_ML(es, 0, get_text_length(es), 0, NULL);

        EDIT_SetCaretPos(es, es->selection_end, es->flags & EF_AFTER_WRAP);
}


/*********************************************************************
 *
 *      EDIT_SetRectNP
 *
 *      note:   this is not (exactly) the handler called on EM_SETRECTNP
 *              it is also used to set the rect of a single line control
 *
 */
static void EDIT_SetRectNP(EDITSTATE *es, const RECT *rc)
{
        LONG_PTR ExStyle;
        INT bw, bh;
        ExStyle = GetWindowLongPtrW(es->hwndSelf, GWL_EXSTYLE);

        CopyRect(&es->format_rect, rc);

        if (ExStyle & WS_EX_CLIENTEDGE) {
                es->format_rect.left++;
                es->format_rect.right--;

                if (es->format_rect.bottom - es->format_rect.top
                    >= es->line_height + 2)
                {
                        es->format_rect.top++;
                        es->format_rect.bottom--;
                }
        }
        else if (es->style & WS_BORDER) {
                bw = GetSystemMetrics(SM_CXBORDER) + 1;
                bh = GetSystemMetrics(SM_CYBORDER) + 1;
                InflateRect(&es->format_rect, -bw, 0);
                if (es->format_rect.bottom - es->format_rect.top >= es->line_height + 2 * bh)
                    InflateRect(&es->format_rect, 0, -bh);
        }

        es->format_rect.left += es->left_margin;
        es->format_rect.right -= es->right_margin;
        EDIT_AdjustFormatRect(es);
}


/*********************************************************************
 *
 *      EM_CHARFROMPOS
 *
 *      returns line number (not index) in high-order word of result.
 *      NB : Q137805 is unclear about this. POINT * pointer in lParam apply
 *      to Richedit, not to the edit control. Original documentation is valid.
 *      FIXME: do the specs mean to return -1 if outside client area or
 *              if outside formatting rectangle ???
 *
 */
static LRESULT EDIT_EM_CharFromPos(EDITSTATE *es, INT x, INT y)
{
        POINT pt;
        RECT rc;
        INT index;

        pt.x = x;
        pt.y = y;
        GetClientRect(es->hwndSelf, &rc);
        if (!PtInRect(&rc, pt))
                return -1;

        index = EDIT_CharFromPos(es, x, y, NULL);
        return MAKELONG(index, EDIT_EM_LineFromChar(es, index));
}


/*********************************************************************
 *
 *      EM_FMTLINES
 *
 * Enable or disable soft breaks.
 *
 * This means: insert or remove the soft linebreak character (\r\r\n).
 * Take care to check if the text still fits the buffer after insertion.
 * If not, notify with EN_ERRSPACE.
 *
 */
static BOOL EDIT_EM_FmtLines(EDITSTATE *es, BOOL add_eol)
{
        es->flags &= ~EF_USE_SOFTBRK;
        if (add_eol) {
                es->flags |= EF_USE_SOFTBRK;
                FIXME("soft break enabled, not implemented\n");
        }
        return add_eol;
}


/*********************************************************************
 *
 *      EM_GETHANDLE
 *
 *      Hopefully this won't fire back at us.
 *      We always start with a fixed buffer in the local heap.
 *      Despite of the documentation says that the local heap is used
 *      only if DS_LOCALEDIT flag is set, NT and 2000 always allocate
 *      buffer on the local heap.
 *
 */
static HLOCAL EDIT_EM_GetHandle(EDITSTATE *es)
{
    if (!(es->style & ES_MULTILINE))
        return 0;

    EDIT_UnlockBuffer(es, TRUE);

    /* The text buffer handle belongs to the app */
    es->hlocapp = es->hloc32W;

    TRACE("Returning %p, LocalSize() = %Id\n", es->hlocapp, LocalSize(es->hlocapp));
    return es->hlocapp;
}


/*********************************************************************
 *
 *      EM_GETLINE
 *
 */
static INT EDIT_EM_GetLine(EDITSTATE *es, INT line, LPWSTR dst)
{
    INT line_len, dst_len;
    LPWSTR src;
    INT i;

    if (es->style & ES_MULTILINE)
    {
        if (line >= es->line_count)
            return 0;
    }
    else
        line = 0;

    i = EDIT_EM_LineIndex(es, line);
    src = es->text + i;
    line_len = EDIT_EM_LineLength(es, i);
    dst_len = *(WORD *)dst;

    if (dst_len <= line_len)
    {
        memcpy(dst, src, dst_len * sizeof(WCHAR));
        return dst_len;
    }
    else /* Append 0 if enough space */
    {
        memcpy(dst, src, line_len * sizeof(WCHAR));
        dst[line_len] = 0;
        return line_len;
    }
}


/*********************************************************************
 *
 *      EM_GETSEL
 *
 */
static LRESULT EDIT_EM_GetSel(const EDITSTATE *es, PUINT start, PUINT end)
{
        UINT s = es->selection_start;
        UINT e = es->selection_end;

        ORDER_UINT(s, e);
        if (start)
                *start = s;
        if (end)
                *end = e;
        return MAKELONG(s, e);
}


/*********************************************************************
 *
 *      EM_REPLACESEL
 *
 *      FIXME: handle ES_NUMBER and ES_OEMCONVERT here
 *
 */
static void EDIT_EM_ReplaceSel(EDITSTATE *es, BOOL can_undo, const WCHAR *lpsz_replace, UINT strl,
                               BOOL send_update, BOOL honor_limit)
{
        UINT tl = get_text_length(es);
        UINT utl;
        UINT s;
        UINT e;
        UINT i;
        UINT size;
        LPWSTR p;
        HRGN hrgn = 0;
        LPWSTR buf = NULL;
        UINT bufl;

        TRACE("%s, can_undo %d, send_update %d\n",
            debugstr_wn(lpsz_replace, strl), can_undo, send_update);

        s = es->selection_start;
        e = es->selection_end;

        EDIT_InvalidateUniscribeData(es);
        if ((s == e) && !strl)
                return;

        ORDER_UINT(s, e);

        size = tl - (e - s) + strl;
        if (!size)
                es->text_width = 0;

        /* Issue the EN_MAXTEXT notification and continue with replacing text
         * so that buffer limit is honored. */
        if ((honor_limit) && (size > es->buffer_limit))
        {
                if (!notify_parent(es, EN_MAXTEXT)) return;
                /* Buffer limit can be smaller than the actual length of text in combobox */
                if (es->buffer_limit < (tl - (e-s)))
                        strl = 0;
                else
                        strl = min(strl, es->buffer_limit - (tl - (e-s)));
        }

        if (!EDIT_MakeFit(es, tl - (e - s) + strl))
                return;

        if (e != s) {
                /* there is something to be deleted */
                TRACE("deleting stuff.\n");
                bufl = e - s;
                buf = Alloc((bufl + 1) * sizeof(WCHAR));
                if (!buf) return;
                memcpy(buf, es->text + s, bufl * sizeof(WCHAR));
                buf[bufl] = 0; /* ensure 0 termination */
                /* now delete */
                lstrcpyW(es->text + s, es->text + e);
                text_buffer_changed(es);
        }
        if (strl) {
                /* there is an insertion */
                tl = get_text_length(es);
                TRACE("inserting stuff (tl %d, strl %d, selstart %d (%s), text %s)\n", tl, strl, s, debugstr_w(es->text + s), debugstr_w(es->text));
                for (p = es->text + tl ; p >= es->text + s ; p--)
                        p[strl] = p[0];
                for (i = 0 , p = es->text + s ; i < strl ; i++)
                        p[i] = lpsz_replace[i];
                if(es->style & ES_UPPERCASE)
                        CharUpperBuffW(p, strl);
                else if(es->style & ES_LOWERCASE)
                        CharLowerBuffW(p, strl);
                text_buffer_changed(es);
        }
        if (es->style & ES_MULTILINE)
        {
                INT st = min(es->selection_start, es->selection_end);
                INT vlc = get_vertical_line_count(es);

                hrgn = CreateRectRgn(0, 0, 0, 0);
                EDIT_BuildLineDefs_ML(es, st, st + strl,
                                strl - abs(es->selection_end - es->selection_start), hrgn);
                /* if text is too long undo all changes */
                if (honor_limit && !(es->style & ES_AUTOVSCROLL) && (es->line_count > vlc)) {
                        if (strl)
                                lstrcpyW(es->text + e, es->text + e + strl);
                        if (e != s)
                                for (i = 0 , p = es->text ; i < e - s ; i++)
                                        p[i + s] = buf[i];
                        text_buffer_changed(es);
                        EDIT_BuildLineDefs_ML(es, s, e,
                                abs(es->selection_end - es->selection_start) - strl, hrgn);
                        strl = 0;
                        e = s;
                        SetRectRgn(hrgn, 0, 0, 0, 0);
                        if (!notify_parent(es, EN_MAXTEXT)) return;
                }
        }
        else {
                INT fw = es->format_rect.right - es->format_rect.left;
                EDIT_InvalidateUniscribeData(es);
                EDIT_CalcLineWidth_SL(es);
                /* remove chars that don't fit */
                if (honor_limit && !(es->style & ES_AUTOHSCROLL) && (es->text_width > fw)) {
                        while ((es->text_width > fw) && s + strl >= s) {
                                lstrcpyW(es->text + s + strl - 1, es->text + s + strl);
                                strl--;
                                es->text_length = -1;
                                EDIT_InvalidateUniscribeData(es);
                                EDIT_CalcLineWidth_SL(es);
                        }
                        text_buffer_changed(es);
                        if (!notify_parent(es, EN_MAXTEXT)) return;
                }
        }

        if (e != s) {
                if (can_undo) {
                        utl = lstrlenW(es->undo_text);
                        if (!es->undo_insert_count && (*es->undo_text && (s == es->undo_position))) {
                                /* undo-buffer is extended to the right */
                                EDIT_MakeUndoFit(es, utl + e - s);
                                memcpy(es->undo_text + utl, buf, (e - s)*sizeof(WCHAR));
                                (es->undo_text + utl)[e - s] = 0; /* ensure 0 termination */
                        } else if (!es->undo_insert_count && (*es->undo_text && (e == es->undo_position))) {
                                /* undo-buffer is extended to the left */
                                EDIT_MakeUndoFit(es, utl + e - s);
                                for (p = es->undo_text + utl ; p >= es->undo_text ; p--)
                                        p[e - s] = p[0];
                                for (i = 0 , p = es->undo_text ; i < e - s ; i++)
                                        p[i] = buf[i];
                                es->undo_position = s;
                        } else {
                                /* new undo-buffer */
                                EDIT_MakeUndoFit(es, e - s);
                                memcpy(es->undo_text, buf, (e - s)*sizeof(WCHAR));
                                es->undo_text[e - s] = 0; /* ensure 0 termination */
                                es->undo_position = s;
                        }
                        /* any deletion makes the old insertion-undo invalid */
                        es->undo_insert_count = 0;
                } else
                        EDIT_EM_EmptyUndoBuffer(es);
        }
        if (strl) {
                if (can_undo) {
                        if ((s == es->undo_position) ||
                                ((es->undo_insert_count) &&
                                (s == es->undo_position + es->undo_insert_count)))
                                /*
                                 * insertion is new and at delete position or
                                 * an extension to either left or right
                                 */
                                es->undo_insert_count += strl;
                        else {
                                /* new insertion undo */
                                es->undo_position = s;
                                es->undo_insert_count = strl;
                                /* new insertion makes old delete-buffer invalid */
                                *es->undo_text = '\0';
                        }
                } else
                        EDIT_EM_EmptyUndoBuffer(es);
        }

        Free(buf);

        s += strl;

        /* If text has been deleted and we're right or center aligned then scroll rightward */
        if (es->style & (ES_RIGHT | ES_CENTER))
        {
                INT delta = strl - abs(es->selection_end - es->selection_start);

                if (delta < 0 && es->x_offset)
                {
                        if (abs(delta) > es->x_offset)
                                es->x_offset = 0;
                        else
                                es->x_offset += delta;
                }
        }

        EDIT_EM_SetSel(es, s, s, FALSE);
        es->flags |= EF_MODIFIED;
        if (send_update) es->flags |= EF_UPDATE;
        if (hrgn)
        {
                EDIT_UpdateTextRegion(es, hrgn, TRUE);
                DeleteObject(hrgn);
        }
        else
            EDIT_UpdateText(es, NULL, TRUE);

        EDIT_EM_ScrollCaret(es);

        /* force scroll info update */
        EDIT_UpdateScrollInfo(es);


        if(send_update || (es->flags & EF_UPDATE))
        {
            es->flags &= ~EF_UPDATE;
            if (!notify_parent(es, EN_CHANGE)) return;
        }
        EDIT_InvalidateUniscribeData(es);
}


/*********************************************************************
 *
 *      EM_SETHANDLE
 *
 *      FIXME:  ES_LOWERCASE, ES_UPPERCASE, ES_OEMCONVERT, ES_NUMBER ???
 *
 */
static void EDIT_EM_SetHandle(EDITSTATE *es, HLOCAL hloc)
{
    if (!(es->style & ES_MULTILINE))
        return;

    if (!hloc)
        return;

    EDIT_UnlockBuffer(es, TRUE);

    es->hloc32W = hloc;
    es->buffer_size = LocalSize(es->hloc32W)/sizeof(WCHAR) - 1;

    /* The text buffer handle belongs to the control */
    es->hlocapp = NULL;

    EDIT_LockBuffer(es);
    text_buffer_changed(es);

    es->x_offset = es->y_offset = 0;
    es->selection_start = es->selection_end = 0;
    EDIT_EM_EmptyUndoBuffer(es);
    es->flags &= ~EF_MODIFIED;
    es->flags &= ~EF_UPDATE;
    EDIT_BuildLineDefs_ML(es, 0, get_text_length(es), 0, NULL);
    EDIT_UpdateText(es, NULL, TRUE);
    EDIT_EM_ScrollCaret(es);
    /* force scroll info update */
    EDIT_UpdateScrollInfo(es);
}


/*********************************************************************
 *
 *      EM_SETLIMITTEXT
 *
 *      NOTE: this version currently implements WinNT limits
 *
 */
static void EDIT_EM_SetLimitText(EDITSTATE *es, UINT limit)
{
    if (!limit) limit = ~0u;
    if (!(es->style & ES_MULTILINE)) limit = min(limit, 0x7ffffffe);
    es->buffer_limit = limit;
}

static BOOL is_cjk(HDC dc)
{
    const DWORD FS_DBCS_MASK = FS_JISJAPAN|FS_CHINESESIMP|FS_WANSUNG|FS_CHINESETRAD|FS_JOHAB;
    FONTSIGNATURE fs;

    switch (GdiGetCodePage(dc)) {
    case 932: case 936: case 949: case 950: case 1361:
        return TRUE;
    default:
        return (GetTextCharsetInfo(dc, &fs, 0) != DEFAULT_CHARSET &&
                (fs.fsCsb[0] & FS_DBCS_MASK));
    }
}

static int get_cjk_fontinfo_margin(int width, int side_bearing)
{
    int margin;
    if (side_bearing < 0)
        margin = min(-side_bearing, width/2);
    else
        margin = 0;
    return margin;
}

struct char_width_info {
    INT min_lsb, min_rsb, unknown;
};

/* Undocumented gdi32 export */
extern BOOL WINAPI GetCharWidthInfo(HDC, struct char_width_info *);

/*********************************************************************
 *
 *      EM_SETMARGINS
 *
 * EC_USEFONTINFO is used as a left or right value i.e. lParam and not as an
 * action wParam despite what the docs say. EC_USEFONTINFO calculates the
 * margin according to the textmetrics of the current font.
 *
 * When EC_USEFONTINFO is used, the margins only change if the edit control is
 * equal to or larger than a certain size. The empty client rect is treated as
 * 80 pixels width.
 */
static void EDIT_EM_SetMargins(EDITSTATE *es, INT action,
                               WORD left, WORD right, BOOL repaint)
{
        TEXTMETRICW tm;
        INT default_left_margin  = 0; /* in pixels */
        INT default_right_margin = 0; /* in pixels */

        /* Set the default margins depending on the font */
        if (es->font && (left == EC_USEFONTINFO || right == EC_USEFONTINFO)) {
            HDC dc = GetDC(es->hwndSelf);
            HFONT old_font = SelectObject(dc, es->font);
            LONG width = GdiGetCharDimensions(dc, &tm, NULL), rc_width;
            RECT rc;

            /* The default margins are only non zero for TrueType or Vector fonts */
            if (tm.tmPitchAndFamily & ( TMPF_VECTOR | TMPF_TRUETYPE )) {
                struct char_width_info width_info;

                if (is_cjk(dc) && GetCharWidthInfo(dc, &width_info))
                {
                    default_left_margin = get_cjk_fontinfo_margin(width, width_info.min_lsb);
                    default_right_margin = get_cjk_fontinfo_margin(width, width_info.min_rsb);
                }
                else
                {
                    default_left_margin = width / 2;
                    default_right_margin = width / 2;
                }

                GetClientRect(es->hwndSelf, &rc);
                rc_width = !IsRectEmpty(&rc) ? rc.right - rc.left : 80;
                if (rc_width < default_left_margin + default_right_margin + width * 2) {
                    default_left_margin = es->left_margin;
                    default_right_margin = es->right_margin;
                }
            }
            SelectObject(dc, old_font);
            ReleaseDC(es->hwndSelf, dc);
        }

        if (action & EC_LEFTMARGIN) {
                es->format_rect.left -= es->left_margin;
                if (left != EC_USEFONTINFO)
                        es->left_margin = left;
                else
                        es->left_margin = default_left_margin;
                es->format_rect.left += es->left_margin;
        }

        if (action & EC_RIGHTMARGIN) {
                es->format_rect.right += es->right_margin;
                if (right != EC_USEFONTINFO)
                        es->right_margin = right;
                else
                        es->right_margin = default_right_margin;
                es->format_rect.right -= es->right_margin;
        }

        if (action & (EC_LEFTMARGIN | EC_RIGHTMARGIN)) {
                EDIT_AdjustFormatRect(es);
                if (repaint) EDIT_UpdateText(es, NULL, TRUE);
        }

        TRACE("left=%d, right=%d\n", es->left_margin, es->right_margin);
}


/*********************************************************************
 *
 *      EM_SETPASSWORDCHAR
 *
 */
static void EDIT_EM_SetPasswordChar(EDITSTATE *es, WCHAR c)
{
        LONG style;

        if (es->style & ES_MULTILINE)
                return;

        if (es->password_char == c)
                return;

        style = GetWindowLongW( es->hwndSelf, GWL_STYLE );
        es->password_char = c;
        if (c) {
            SetWindowLongW( es->hwndSelf, GWL_STYLE, style | ES_PASSWORD );
            es->style |= ES_PASSWORD;
        } else {
            SetWindowLongW( es->hwndSelf, GWL_STYLE, style & ~ES_PASSWORD );
            es->style &= ~ES_PASSWORD;
        }
        EDIT_InvalidateUniscribeData(es);
        EDIT_UpdateText(es, NULL, TRUE);
}


/*********************************************************************
 *
 *      EM_SETTABSTOPS
 *
 */
static BOOL EDIT_EM_SetTabStops(EDITSTATE *es, INT count, const INT *tabs)
{
        if (!(es->style & ES_MULTILINE))
                return FALSE;
        Free(es->tabs);
        es->tabs_count = count;
        if (!count)
                es->tabs = NULL;
        else {
                es->tabs = Alloc(count * sizeof(INT));
                memcpy(es->tabs, tabs, count * sizeof(INT));
        }
        EDIT_InvalidateUniscribeData(es);
        return TRUE;
}


/*********************************************************************
 *
 *      EM_SETWORDBREAKPROC
 *
 */
static void EDIT_EM_SetWordBreakProc(EDITSTATE *es, EDITWORDBREAKPROCW wbp)
{
        if (es->word_break_proc == wbp)
                return;

        es->word_break_proc = wbp;

        if ((es->style & ES_MULTILINE) && !(es->style & ES_AUTOHSCROLL)) {
                EDIT_BuildLineDefs_ML(es, 0, get_text_length(es), 0, NULL);
                EDIT_UpdateText(es, NULL, TRUE);
        }
}


/*********************************************************************
 *
 *      EM_UNDO / WM_UNDO
 *
 */
static BOOL EDIT_EM_Undo(EDITSTATE *es)
{
        INT ulength;
        LPWSTR utext;

        /* As per MSDN spec, for a single-line edit control,
           the return value is always TRUE */
        if( es->style & ES_READONLY )
            return !(es->style & ES_MULTILINE);

        ulength = lstrlenW(es->undo_text);

        utext = Alloc((ulength + 1) * sizeof(WCHAR));

        lstrcpyW(utext, es->undo_text);

        TRACE("before UNDO:insertion length = %d, deletion buffer = %s\n",
                     es->undo_insert_count, debugstr_w(utext));

        EDIT_EM_SetSel(es, es->undo_position, es->undo_position + es->undo_insert_count, FALSE);
        EDIT_EM_EmptyUndoBuffer(es);
        EDIT_EM_ReplaceSel(es, TRUE, utext, ulength, TRUE, TRUE);
        EDIT_EM_SetSel(es, es->undo_position, es->undo_position + es->undo_insert_count, FALSE);
        /* send the notification after the selection start and end are set */
        if (!notify_parent(es, EN_CHANGE)) return TRUE;
        EDIT_EM_ScrollCaret(es);
        Free(utext);

        TRACE("after UNDO:insertion length = %d, deletion buffer = %s\n",
                        es->undo_insert_count, debugstr_w(es->undo_text));
        return TRUE;
}


/* Helper function for WM_CHAR
 *
 * According to an MSDN blog article titled "Just because you're a control
 * doesn't mean that you're necessarily inside a dialog box," multiline edit
 * controls without ES_WANTRETURN would attempt to detect whether it is inside
 * a dialog box or not.
 */
static inline BOOL EDIT_IsInsideDialog(EDITSTATE *es)
{
    return (es->flags & EF_DIALOGMODE);
}


/*********************************************************************
 *
 *      WM_PASTE
 *
 */
static void EDIT_WM_Paste(EDITSTATE *es)
{
        HGLOBAL hsrc;
        LPWSTR src, ptr;
        int len;

        /* Protect read-only edit control from modification */
        if(es->style & ES_READONLY)
            return;

        OpenClipboard(es->hwndSelf);
        if ((hsrc = GetClipboardData(CF_UNICODETEXT))) {
                src = GlobalLock(hsrc);
                len = lstrlenW(src);
                /* Protect single-line edit against pasting new line character */
                if (!(es->style & ES_MULTILINE) && ((ptr = wcschr(src, '\n')))) {
                        len = ptr - src;
                        if (len && src[len - 1] == '\r')
                                --len;
                }
                EDIT_EM_ReplaceSel(es, TRUE, src, len, TRUE, TRUE);
                GlobalUnlock(hsrc);
        }
        else if (es->style & ES_PASSWORD) {
            /* clear selected text in password edit box even with empty clipboard */
            EDIT_EM_ReplaceSel(es, TRUE, NULL, 0, TRUE, TRUE);
        }
        CloseClipboard();
}


/*********************************************************************
 *
 *      WM_COPY
 *
 */
static void EDIT_WM_Copy(EDITSTATE *es)
{
        INT s = min(es->selection_start, es->selection_end);
        INT e = max(es->selection_start, es->selection_end);
        HGLOBAL hdst;
        LPWSTR dst;
        DWORD len;

        if (e == s) return;

        len = e - s;
        hdst = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, (len + 1) * sizeof(WCHAR));
        dst = GlobalLock(hdst);
        memcpy(dst, es->text + s, len * sizeof(WCHAR));
        dst[len] = 0; /* ensure 0 termination */
        TRACE("%s\n", debugstr_w(dst));
        GlobalUnlock(hdst);
        OpenClipboard(es->hwndSelf);
        EmptyClipboard();
        SetClipboardData(CF_UNICODETEXT, hdst);
        CloseClipboard();
}


/*********************************************************************
 *
 *      WM_CLEAR
 *
 */
static inline void EDIT_WM_Clear(EDITSTATE *es)
{
        /* Protect read-only edit control from modification */
        if(es->style & ES_READONLY)
            return;

        EDIT_EM_ReplaceSel(es, TRUE, NULL, 0, TRUE, TRUE);
}


/*********************************************************************
 *
 *      WM_CUT
 *
 */
static inline void EDIT_WM_Cut(EDITSTATE *es)
{
        EDIT_WM_Copy(es);
        EDIT_WM_Clear(es);
}


/*********************************************************************
 *
 *      WM_CHAR
 *
 */
static LRESULT EDIT_WM_Char(EDITSTATE *es, WCHAR c)
{
        BOOL control;

        control = GetKeyState(VK_CONTROL) & 0x8000;

        switch (c) {
        case '\r':
            /* If it's not a multiline edit box, it would be ignored below.
             * For multiline edit without ES_WANTRETURN, we have to make a
             * special case.
             */
            if ((es->style & ES_MULTILINE) && !(es->style & ES_WANTRETURN))
                if (EDIT_IsInsideDialog(es))
                    break;
        case '\n':
                if (es->style & ES_MULTILINE) {
                        if (es->style & ES_READONLY) {
                                EDIT_MoveHome(es, FALSE, FALSE);
                                EDIT_MoveDown_ML(es, FALSE);
                        } else
                                EDIT_EM_ReplaceSel(es, TRUE, L"\r\n", 2, TRUE, TRUE);
                }
                break;
        case '\t':
                if ((es->style & ES_MULTILINE) && !(es->style & ES_READONLY))
                {
                        if (EDIT_IsInsideDialog(es))
                            break;
                        EDIT_EM_ReplaceSel(es, TRUE, L"\t", 1, TRUE, TRUE);
                }
                break;
        case VK_BACK:
                if (!(es->style & ES_READONLY) && !control) {
                        if (es->selection_start != es->selection_end)
                                EDIT_WM_Clear(es);
                        else {
                                /* delete character left of caret */
                                EDIT_EM_SetSel(es, (UINT)-1, 0, FALSE);
                                EDIT_MoveBackward(es, TRUE);
                                EDIT_WM_Clear(es);
                        }
                }
                break;
        case 0x03: /* ^C */
                if (!(es->style & ES_PASSWORD))
                    SendMessageW(es->hwndSelf, WM_COPY, 0, 0);
                break;
        case 0x16: /* ^V */
                if (!(es->style & ES_READONLY))
                    SendMessageW(es->hwndSelf, WM_PASTE, 0, 0);
                break;
        case 0x18: /* ^X */
                if (!((es->style & ES_READONLY) || (es->style & ES_PASSWORD)))
                    SendMessageW(es->hwndSelf, WM_CUT, 0, 0);
                break;
        case 0x1A: /* ^Z */
                if (!(es->style & ES_READONLY))
                    SendMessageW(es->hwndSelf, WM_UNDO, 0, 0);
                break;

        default:
                /*If Edit control style is ES_NUMBER allow users to key in only numeric values*/
                if( (es->style & ES_NUMBER) && !( c >= '0' && c <= '9') )
                        break;

                if (!(es->style & ES_READONLY) && (c >= ' ') && (c != 127))
                        EDIT_EM_ReplaceSel(es, TRUE, &c, 1, TRUE, TRUE);
                break;
        }
    return 1;
}


/*********************************************************************
 *
 *      EDIT_ContextMenuCommand
 *
 */
static void EDIT_ContextMenuCommand(EDITSTATE *es, UINT id)
{
        switch (id) {
                case EM_UNDO:
                        SendMessageW(es->hwndSelf, WM_UNDO, 0, 0);
                        break;
                case WM_CUT:
                        SendMessageW(es->hwndSelf, WM_CUT, 0, 0);
                        break;
                case WM_COPY:
                        SendMessageW(es->hwndSelf, WM_COPY, 0, 0);
                        break;
                case WM_PASTE:
                        SendMessageW(es->hwndSelf, WM_PASTE, 0, 0);
                        break;
                case WM_CLEAR:
                        SendMessageW(es->hwndSelf, WM_CLEAR, 0, 0);
                        break;
                case EM_SETSEL:
                        SendMessageW(es->hwndSelf, EM_SETSEL, 0, -1);
                        break;
                default:
                        ERR("unknown menu item, please report\n");
                        break;
        }
}


/*********************************************************************
 *
 *      WM_CONTEXTMENU
 *
 *      Note: the resource files resource/sysres_??.rc cannot define a
 *              single popup menu.  Hence we use a (dummy) menubar
 *              containing the single popup menu as its first item.
 *
 *      FIXME: the message identifiers have been chosen arbitrarily,
 *              hence we use MF_BYPOSITION.
 *              We might as well use the "real" values (anybody knows ?)
 *              The menu definition is in resources/sysres_??.rc.
 *              Once these are OK, we better use MF_BYCOMMAND here
 *              (as we do in EDIT_WM_Command()).
 *
 */
static void EDIT_WM_ContextMenu(EDITSTATE *es, INT x, INT y)
{
    HMENU menu = LoadMenuA(GetModuleHandleA("user32.dll"), "EDITMENU");
    HMENU popup = GetSubMenu(menu, 0);
    UINT start = es->selection_start;
    UINT end = es->selection_end;
    UINT cmd;
    POINT pt;

    ORDER_UINT(start, end);

    /* undo */
    EnableMenuItem(popup, 0, MF_BYPOSITION | (EDIT_EM_CanUndo(es) && !(es->style & ES_READONLY) ? MF_ENABLED : MF_GRAYED));
    /* cut */
    EnableMenuItem(popup, 2, MF_BYPOSITION | ((end - start) && !(es->style & ES_PASSWORD) && !(es->style & ES_READONLY) ? MF_ENABLED : MF_GRAYED));
    /* copy */
    EnableMenuItem(popup, 3, MF_BYPOSITION | ((end - start) && !(es->style & ES_PASSWORD) ? MF_ENABLED : MF_GRAYED));
    /* paste */
    EnableMenuItem(popup, 4, MF_BYPOSITION | (IsClipboardFormatAvailable(CF_UNICODETEXT) && !(es->style & ES_READONLY) ? MF_ENABLED : MF_GRAYED));
    /* delete */
    EnableMenuItem(popup, 5, MF_BYPOSITION | ((end - start) && !(es->style & ES_READONLY) ? MF_ENABLED : MF_GRAYED));
    /* select all */
    EnableMenuItem(popup, 7, MF_BYPOSITION | (start || (end != get_text_length(es)) ? MF_ENABLED : MF_GRAYED));

    pt.x = x;
    pt.y = y;

    if (pt.x == -1 && pt.y == -1) /* passed via VK_APPS press/release */
    {
        RECT rc;

        /* Windows places the menu at the edit's center in this case */
        GetClientRect(es->hwndSelf, &rc);
        pt.x = rc.left + (rc.right - rc.left) / 2;
        pt.y = rc.top + (rc.bottom - rc.top) / 2;
        ClientToScreen(es->hwndSelf, &pt);
    }

    if (!(es->flags & EF_FOCUSED))
        SetFocus(es->hwndSelf);

    cmd = TrackPopupMenu(popup, TPM_LEFTALIGN | TPM_RIGHTBUTTON | TPM_RETURNCMD | TPM_NONOTIFY,
            pt.x, pt.y, 0, es->hwndSelf, NULL);

    if (cmd)
        EDIT_ContextMenuCommand(es, cmd);

    DestroyMenu(menu);
}


/*********************************************************************
 *
 *      WM_GETTEXT
 *
 */
static INT EDIT_WM_GetText(const EDITSTATE *es, INT count, LPWSTR dst)
{
    if (!count)
        return 0;

    lstrcpynW(dst, es->text, count);
    return lstrlenW(dst);
}

/*********************************************************************
 *
 *      EDIT_CheckCombo
 *
 */
static BOOL EDIT_CheckCombo(EDITSTATE *es, UINT msg, INT key)
{
    HWND hLBox = es->hwndListBox;
    HWND hCombo;
    BOOL bDropped;
    int  nEUI;

    if (!hLBox)
        return FALSE;

    hCombo   = GetParent(es->hwndSelf);
    bDropped = TRUE;
    nEUI     = 0;

    TRACE("[%p]: handling msg %x (%x)\n", es->hwndSelf, msg, key);

    if (key == VK_UP || key == VK_DOWN)
    {
        if (SendMessageW(hCombo, CB_GETEXTENDEDUI, 0, 0))
            nEUI = 1;

        if (msg == WM_KEYDOWN || nEUI)
            bDropped = (BOOL)SendMessageW(hCombo, CB_GETDROPPEDSTATE, 0, 0);
    }

    switch (msg)
    {
    case WM_KEYDOWN:
        if (!bDropped && nEUI && (key == VK_UP || key == VK_DOWN))
        {
            /* make sure ComboLBox pops up */
            SendMessageW(hCombo, CB_SETEXTENDEDUI, FALSE, 0);
            key = VK_F4;
            nEUI = 2;
        }

        SendMessageW(hLBox, WM_KEYDOWN, key, 0);
        break;

    case WM_SYSKEYDOWN: /* Handle Alt+up/down arrows */
        if (nEUI)
           SendMessageW(hCombo, CB_SHOWDROPDOWN, !bDropped, 0);
        else
           SendMessageW(hLBox, WM_KEYDOWN, VK_F4, 0);
        break;
    }

    if (nEUI == 2)
        SendMessageW(hCombo, CB_SETEXTENDEDUI, TRUE, 0);

    return TRUE;
}


/*********************************************************************
 *
 *      WM_KEYDOWN
 *
 *      Handling of special keys that don't produce a WM_CHAR
 *      (i.e. non-printable keys) & Backspace & Delete
 *
 */
static LRESULT EDIT_WM_KeyDown(EDITSTATE *es, INT key)
{
        BOOL shift;
        BOOL control;

        if (GetKeyState(VK_MENU) & 0x8000)
                return 0;

        shift = GetKeyState(VK_SHIFT) & 0x8000;
        control = GetKeyState(VK_CONTROL) & 0x8000;

        switch (key) {
        case VK_F4:
        case VK_UP:
                if (EDIT_CheckCombo(es, WM_KEYDOWN, key) || key == VK_F4)
                        break;

                /* fall through */
        case VK_LEFT:
                if ((es->style & ES_MULTILINE) && (key == VK_UP))
                        EDIT_MoveUp_ML(es, shift);
                else
                        if (control)
                                EDIT_MoveWordBackward(es, shift);
                        else
                                EDIT_MoveBackward(es, shift);
                break;
        case VK_DOWN:
                if (EDIT_CheckCombo(es, WM_KEYDOWN, key))
                        break;
                /* fall through */
        case VK_RIGHT:
                if ((es->style & ES_MULTILINE) && (key == VK_DOWN))
                        EDIT_MoveDown_ML(es, shift);
                else if (control)
                        EDIT_MoveWordForward(es, shift);
                else
                        EDIT_MoveForward(es, shift);
                break;
        case VK_HOME:
                EDIT_MoveHome(es, shift, control);
                break;
        case VK_END:
                EDIT_MoveEnd(es, shift, control);
                break;
        case VK_PRIOR:
                if (es->style & ES_MULTILINE)
                        EDIT_MovePageUp_ML(es, shift);
                else
                        EDIT_CheckCombo(es, WM_KEYDOWN, key);
                break;
        case VK_NEXT:
                if (es->style & ES_MULTILINE)
                        EDIT_MovePageDown_ML(es, shift);
                else
                        EDIT_CheckCombo(es, WM_KEYDOWN, key);
                break;
        case VK_DELETE:
                if (!(es->style & ES_READONLY) && !(shift && control)) {
                        if (es->selection_start != es->selection_end) {
                                if (shift)
                                        EDIT_WM_Cut(es);
                                else
                                        EDIT_WM_Clear(es);
                        } else {
                                EDIT_EM_SetSel(es, ~0u, 0, FALSE);
                                if (shift)
                                        /* delete character left of caret */
                                        EDIT_MoveBackward(es, TRUE);
                                else if (control)
                                        /* delete to end of line */
                                        EDIT_MoveEnd(es, TRUE, FALSE);
                                else
                                        /* delete character right of caret */
                                        EDIT_MoveForward(es, TRUE);
                                EDIT_WM_Clear(es);
                        }
                }
                break;
        case VK_INSERT:
                if (shift) {
                        if (!(es->style & ES_READONLY))
                                EDIT_WM_Paste(es);
                } else if (control)
                        EDIT_WM_Copy(es);
                break;
        case VK_RETURN:
            /* If the edit doesn't want the return send a message to the default object */
            if(!(es->style & ES_MULTILINE) || !(es->style & ES_WANTRETURN))
            {
                DWORD dw;

                if (!EDIT_IsInsideDialog(es)) break;
                if (control) break;
                dw = SendMessageW(es->hwndParent, DM_GETDEFID, 0, 0);
                if (HIWORD(dw) == DC_HASDEFID)
                {
                    HWND hwDefCtrl = GetDlgItem(es->hwndParent, LOWORD(dw));
                    if (hwDefCtrl)
                    {
                        SendMessageW(es->hwndParent, WM_NEXTDLGCTL, (WPARAM)hwDefCtrl, TRUE);
                        PostMessageW(hwDefCtrl, WM_KEYDOWN, VK_RETURN, 0);
                    }
                }
            }
            break;
        case VK_ESCAPE:
            if ((es->style & ES_MULTILINE) && EDIT_IsInsideDialog(es))
                PostMessageW(es->hwndParent, WM_CLOSE, 0, 0);
            break;
        case VK_TAB:
            if ((es->style & ES_MULTILINE) && EDIT_IsInsideDialog(es))
                SendMessageW(es->hwndParent, WM_NEXTDLGCTL, shift, 0);
            break;
        case 'A':
            if (control)
            {
                if (EDIT_EM_SetSel(es, 0, get_text_length(es), FALSE))
                {
                    if (!notify_parent(es, EN_UPDATE)) break;
                    notify_parent(es, EN_CHANGE);
                }
            }
            break;
        }
        return TRUE;
}


/*********************************************************************
 *
 *      WM_KILLFOCUS
 *
 */
static LRESULT EDIT_WM_KillFocus(HTHEME theme, EDITSTATE *es)
{
    UINT flags = RDW_INVALIDATE;

    es->flags &= ~EF_FOCUSED;
    DestroyCaret();
    if (!(es->style & ES_NOHIDESEL))
        EDIT_InvalidateText(es, es->selection_start, es->selection_end);
    if (!notify_parent(es, EN_KILLFOCUS)) return 0;
    /* Throw away left over scroll when we lose focus */
    es->wheelDeltaRemainder = 0;

    if (theme)
        flags |= RDW_FRAME;

    RedrawWindow(es->hwndSelf, NULL, NULL, flags);
    return 0;
}


/*********************************************************************
 *
 *      WM_LBUTTONDBLCLK
 *
 *      The caret position has been set on the WM_LBUTTONDOWN message
 *
 */
static LRESULT EDIT_WM_LButtonDblClk(EDITSTATE *es)
{
        INT s;
        INT e = es->selection_end;
        INT l;
        INT li;
        INT ll;

        es->bCaptureState = TRUE;
        SetCapture(es->hwndSelf);

        l = EDIT_EM_LineFromChar(es, e);
        li = EDIT_EM_LineIndex(es, l);
        ll = EDIT_EM_LineLength(es, e);
        s = li + EDIT_CallWordBreakProc(es, li, e - li, ll, WB_LEFT);
        e = li + EDIT_CallWordBreakProc(es, li, e - li, ll, WB_RIGHT);
        EDIT_EM_SetSel(es, s, e, FALSE);
        EDIT_EM_ScrollCaret(es);
        return 0;
}


/*********************************************************************
 *
 *      WM_LBUTTONDOWN
 *
 */
static LRESULT EDIT_WM_LButtonDown(EDITSTATE *es, DWORD keys, INT x, INT y)
{
        INT e;
        BOOL after_wrap;

        es->bCaptureState = TRUE;
        SetCapture(es->hwndSelf);
        EDIT_ConfinePoint(es, &x, &y);
        e = EDIT_CharFromPos(es, x, y, &after_wrap);
        EDIT_EM_SetSel(es, (keys & MK_SHIFT) ? es->selection_start : e, e, after_wrap);
        EDIT_EM_ScrollCaret(es);

        if (!(es->flags & EF_FOCUSED))
            SetFocus(es->hwndSelf);

        return 0;
}


/*********************************************************************
 *
 *      WM_LBUTTONUP
 *
 */
static LRESULT EDIT_WM_LButtonUp(EDITSTATE *es)
{
        if (es->bCaptureState) {
                if (GetCapture() == es->hwndSelf) ReleaseCapture();
        }
        es->bCaptureState = FALSE;
        return 0;
}


/*********************************************************************
 *
 *      WM_MBUTTONDOWN
 *
 */
static LRESULT EDIT_WM_MButtonDown(EDITSTATE *es)
{
    SendMessageW(es->hwndSelf, WM_PASTE, 0, 0);
    return 0;
}


/*********************************************************************
 *
 *      WM_MOUSEMOVE
 *
 */
static LRESULT EDIT_WM_MouseMove(EDITSTATE *es, INT x, INT y)
{
        INT e;
        BOOL after_wrap;

        /* If the mouse has been captured by process other than the edit control itself,
         * the windows edit controls will not select the strings with mouse move.
         */
        if (!es->bCaptureState || GetCapture() != es->hwndSelf)
                return 0;

        e = EDIT_CharFromPos(es, x, y, &after_wrap);
        EDIT_EM_SetSel(es, es->selection_start, e, after_wrap);
        EDIT_SetCaretPos(es,es->selection_end,es->flags & EF_AFTER_WRAP);
        EDIT_EM_ScrollCaret(es);
        return 0;
}


/*********************************************************************
 *
 *      WM_PAINT
 *
 */
static void EDIT_WM_Paint(EDITSTATE *es, HDC hdc)
{
        PAINTSTRUCT ps;
        INT i;
        HDC dc;
        HFONT old_font = 0;
        RECT rc;
        RECT rcClient;
        RECT rcLine;
        RECT rcRgn;
        HBRUSH brush;
        HBRUSH old_brush;
        INT bw, bh;
        BOOL rev = es->bEnableState &&
                                ((es->flags & EF_FOCUSED) ||
                                        (es->style & ES_NOHIDESEL));
        dc = hdc ? hdc : BeginPaint(es->hwndSelf, &ps);

        /* The dc we use for calculating may not be the one we paint into.
           This is the safest action. */
        EDIT_InvalidateUniscribeData(es);
        GetClientRect(es->hwndSelf, &rcClient);

        /* get the background brush */
        brush = EDIT_NotifyCtlColor(es, dc);

        /* paint the border and the background */
        IntersectClipRect(dc, rcClient.left, rcClient.top, rcClient.right, rcClient.bottom);

        if(es->style & WS_BORDER) {
                bw = GetSystemMetrics(SM_CXBORDER);
                bh = GetSystemMetrics(SM_CYBORDER);
                rc = rcClient;
                if(es->style & ES_MULTILINE) {
                        if(es->style & WS_HSCROLL) rc.bottom+=bh;
                        if(es->style & WS_VSCROLL) rc.right+=bw;
                }

                /* Draw the frame. Same code as in nonclient.c */
                old_brush = SelectObject(dc, GetSysColorBrush(COLOR_WINDOWFRAME));
                PatBlt(dc, rc.left, rc.top, rc.right - rc.left, bh, PATCOPY);
                PatBlt(dc, rc.left, rc.top, bw, rc.bottom - rc.top, PATCOPY);
                PatBlt(dc, rc.left, rc.bottom - 1, rc.right - rc.left, -bw, PATCOPY);
                PatBlt(dc, rc.right - 1, rc.top, -bw, rc.bottom - rc.top, PATCOPY);
                SelectObject(dc, old_brush);

                /* Keep the border clean */
                IntersectClipRect(dc, rc.left+bw, rc.top+bh,
                    max(rc.right-bw, rc.left+bw), max(rc.bottom-bh, rc.top+bh));
        }

        GetClipBox(dc, &rc);
        FillRect(dc, &rc, brush);

        IntersectClipRect(dc, es->format_rect.left,
                                es->format_rect.top,
                                es->format_rect.right,
                                es->format_rect.bottom);
        if (es->style & ES_MULTILINE) {
                rc = rcClient;
                IntersectClipRect(dc, rc.left, rc.top, rc.right, rc.bottom);
        }
        if (es->font)
                old_font = SelectObject(dc, es->font);

        if (!es->bEnableState)
                SetTextColor(dc, GetSysColor(COLOR_GRAYTEXT));
        GetClipBox(dc, &rcRgn);
        if (es->style & ES_MULTILINE) {
                INT vlc = get_vertical_line_count(es);
                for (i = es->y_offset ; i <= min(es->y_offset + vlc, es->y_offset + es->line_count - 1) ; i++) {
                        EDIT_UpdateUniscribeData(es, dc, i);
                        EDIT_GetLineRect(es, i, 0, -1, &rcLine);
                        if (IntersectRect(&rc, &rcRgn, &rcLine))
                                EDIT_PaintLine(es, dc, i, rev);
                }
        } else {
                EDIT_UpdateUniscribeData(es, dc, 0);
                EDIT_GetLineRect(es, 0, 0, -1, &rcLine);
                if (IntersectRect(&rc, &rcRgn, &rcLine))
                        EDIT_PaintLine(es, dc, 0, rev);
        }
        if (es->font)
                SelectObject(dc, old_font);

        if (!hdc)
            EndPaint(es->hwndSelf, &ps);
}

static void EDIT_WM_NCPaint(HWND hwnd, HRGN region)
{
    DWORD exStyle = GetWindowLongW(hwnd, GWL_EXSTYLE);
    HTHEME theme = GetWindowTheme(hwnd);
    HRGN cliprgn = region;

    if (theme && exStyle & WS_EX_CLIENTEDGE)
    {
        HDC dc;
        RECT r;
        int cxEdge = GetSystemMetrics(SM_CXEDGE),
            cyEdge = GetSystemMetrics(SM_CYEDGE);
        const int part = EP_EDITTEXT;
        int state = ETS_NORMAL;
        DWORD dwStyle = GetWindowLongW(hwnd, GWL_STYLE);

        if (!IsWindowEnabled(hwnd))
            state = ETS_DISABLED;
        else if (dwStyle & ES_READONLY)
            state = ETS_READONLY;
        else if (GetFocus() == hwnd)
            state = ETS_FOCUSED;

        GetWindowRect(hwnd, &r);

        /* New clipping region passed to default proc to exclude border */
        cliprgn = CreateRectRgn(r.left + cxEdge, r.top + cyEdge,
            r.right - cxEdge, r.bottom - cyEdge);
        if (region != (HRGN)1)
            CombineRgn(cliprgn, cliprgn, region, RGN_AND);
        OffsetRect(&r, -r.left, -r.top);

        dc = GetDCEx(hwnd, region, DCX_WINDOW|DCX_INTERSECTRGN);

        if (IsThemeBackgroundPartiallyTransparent(theme, part, state))
            DrawThemeParentBackground(hwnd, dc, &r);
        DrawThemeBackground(theme, dc, part, state, &r, 0);
        ReleaseDC(hwnd, dc);
    }

    /* Call default proc to get the scrollbars etc. also painted */
    DefWindowProcW (hwnd, WM_NCPAINT, (WPARAM)cliprgn, 0);
    if (cliprgn != region)
        DeleteObject(cliprgn);
}

/*********************************************************************
 *
 *      WM_SETFOCUS
 *
 */
static void EDIT_WM_SetFocus(HTHEME theme, EDITSTATE *es)
{
    UINT flags = RDW_INVALIDATE;

    es->flags |= EF_FOCUSED;

    if (!(es->style & ES_NOHIDESEL))
        EDIT_InvalidateText(es, es->selection_start, es->selection_end);

    CreateCaret(es->hwndSelf, 0, 1, es->line_height);
    EDIT_SetCaretPos(es, es->selection_end, es->flags & EF_AFTER_WRAP);
    ShowCaret(es->hwndSelf);
    if (!notify_parent(es, EN_SETFOCUS)) return;

    if (theme)
        flags |= RDW_FRAME | RDW_ERASE;

    RedrawWindow(es->hwndSelf, NULL, NULL, flags);
}


static DWORD get_font_margins(HDC hdc, const TEXTMETRICW *tm)
{
        ABC abc[256];
        SHORT left, right;
        UINT i;

        if (!(tm->tmPitchAndFamily & (TMPF_VECTOR | TMPF_TRUETYPE)))
                return MAKELONG(EC_USEFONTINFO, EC_USEFONTINFO);

        if (!is_cjk(hdc))
                return MAKELONG(EC_USEFONTINFO, EC_USEFONTINFO);

        if (!GetCharABCWidthsW(hdc, 0, 255, abc))
                return 0;

        left = right = 0;
        for (i = 0; i < ARRAY_SIZE(abc); i++) {
                if (-abc[i].abcA > right) right = -abc[i].abcA;
                if (-abc[i].abcC > left ) left  = -abc[i].abcC;
        }
        return MAKELONG(left, right);
}

static void EDIT_UpdateImmCompositionFont(EDITSTATE *es)
{
    LOGFONTW composition_font;
    HIMC himc = ImmGetContext(es->hwndSelf);
    GetObjectW(es->font, sizeof(LOGFONTW), &composition_font);
    ImmSetCompositionFontW(himc, &composition_font);
    ImmReleaseContext(es->hwndSelf, himc);
}

/*********************************************************************
 *
 *      WM_SETFONT
 *
 * With Win95 look the margins are set to default font value unless
 * the system font (font == 0) is being set, in which case they are left
 * unchanged.
 *
 */
static void EDIT_WM_SetFont(EDITSTATE *es, HFONT font, BOOL redraw)
{
        TEXTMETRICW tm;
        HDC dc;
        HFONT old_font = 0;
        RECT clientRect;
        DWORD margins;

        es->font = font;
        EDIT_InvalidateUniscribeData(es);
        dc = GetDC(es->hwndSelf);
        if (font)
                old_font = SelectObject(dc, font);
        GetTextMetricsW(dc, &tm);
        es->line_height = tm.tmHeight;
        es->char_width = tm.tmAveCharWidth;
        margins = get_font_margins(dc, &tm);
        if (font)
                SelectObject(dc, old_font);
        ReleaseDC(es->hwndSelf, dc);

        /* Reset the format rect and the margins */
        GetClientRect(es->hwndSelf, &clientRect);
        EDIT_SetRectNP(es, &clientRect);
        if (margins)
                EDIT_EM_SetMargins(es, EC_LEFTMARGIN | EC_RIGHTMARGIN,
                                   LOWORD(margins), HIWORD(margins), FALSE);

        if (es->style & ES_MULTILINE)
                EDIT_BuildLineDefs_ML(es, 0, get_text_length(es), 0, NULL);
        else
            EDIT_CalcLineWidth_SL(es);

        if (redraw)
                EDIT_UpdateText(es, NULL, TRUE);
        if (es->flags & EF_FOCUSED) {
                DestroyCaret();
                CreateCaret(es->hwndSelf, 0, 1, es->line_height);
                EDIT_SetCaretPos(es, es->selection_end,
                                 es->flags & EF_AFTER_WRAP);
                ShowCaret(es->hwndSelf);
        }

        EDIT_UpdateImmCompositionFont(es);
}


/*********************************************************************
 *
 *      WM_SETTEXT
 *
 * NOTES
 *  For multiline controls (ES_MULTILINE), reception of WM_SETTEXT triggers:
 *  The modified flag is reset. No notifications are sent.
 *
 *  For single-line controls, reception of WM_SETTEXT triggers:
 *  The modified flag is reset. EN_UPDATE and EN_CHANGE notifications are sent.
 *
 */
static void EDIT_WM_SetText(EDITSTATE *es, LPCWSTR text)
{
    if (es->flags & EF_UPDATE)
        /* fixed this bug once; complain if we see it about to happen again. */
        ERR("SetSel may generate UPDATE message whose handler may reset "
            "selection.\n");

    EDIT_EM_SetSel(es, 0, (UINT)-1, FALSE);
    if (text)
    {
        TRACE("%s\n", debugstr_w(text));
        EDIT_EM_ReplaceSel(es, FALSE, text, lstrlenW(text), FALSE, FALSE);
    }
    else
    {
        TRACE("<NULL>\n");
        EDIT_EM_ReplaceSel(es, FALSE, NULL, 0, FALSE, FALSE);
    }
    es->x_offset = 0;
    es->flags &= ~EF_MODIFIED;
    EDIT_EM_SetSel(es, 0, 0, FALSE);

    /* Send the notification after the selection start and end have been set
     * edit control doesn't send notification on WM_SETTEXT
     * if it is multiline, or it is part of combobox
     */
    if( !((es->style & ES_MULTILINE) || es->hwndListBox))
    {
        if (!notify_parent(es, EN_UPDATE)) return;
        if (!notify_parent(es, EN_CHANGE)) return;
    }
    EDIT_EM_ScrollCaret(es);
    EDIT_UpdateScrollInfo(es);
    EDIT_InvalidateUniscribeData(es);
}


/*********************************************************************
 *
 *      WM_SIZE
 *
 */
static void EDIT_WM_Size(EDITSTATE *es, UINT action)
{
        if ((action == SIZE_MAXIMIZED) || (action == SIZE_RESTORED)) {
                RECT rc;
                GetClientRect(es->hwndSelf, &rc);
                EDIT_SetRectNP(es, &rc);
                EDIT_UpdateText(es, NULL, TRUE);
        }
}


/*********************************************************************
 *
 *      WM_STYLECHANGED
 *
 * This message is sent by SetWindowLong on having changed either the Style
 * or the extended style.
 *
 * We ensure that the window's version of the styles and the EDITSTATE's agree.
 *
 * See also EDIT_WM_NCCreate
 *
 * It appears that the Windows version of the edit control allows the style
 * (as retrieved by GetWindowLong) to be any value and maintains an internal
 * style variable which will generally be different.  In this function we
 * update the internal style based on what changed in the externally visible
 * style.
 *
 * Much of this content as based upon the MSDN, especially:
 *  Platform SDK Documentation -> User Interface Services ->
 *      Windows User Interface -> Edit Controls -> Edit Control Reference ->
 *      Edit Control Styles
 */
static LRESULT  EDIT_WM_StyleChanged ( EDITSTATE *es, WPARAM which, const STYLESTRUCT *style)
{
        if (GWL_STYLE == which) {
                DWORD style_change_mask;
                DWORD new_style;
                /* Only a subset of changes can be applied after the control
                 * has been created.
                 */
                style_change_mask = ES_UPPERCASE | ES_LOWERCASE |
                                    ES_NUMBER;
                if (es->style & ES_MULTILINE)
                        style_change_mask |= ES_WANTRETURN;

                new_style = style->styleNew & style_change_mask;

                /* Number overrides lowercase overrides uppercase (at least it
                 * does in Win95).  However I'll bet that ES_NUMBER would be
                 * invalid under Win 3.1.
                 */
                if (new_style & ES_NUMBER) {
                        ; /* do not override the ES_NUMBER */
                }  else if (new_style & ES_LOWERCASE) {
                        new_style &= ~ES_UPPERCASE;
                }

                es->style = (es->style & ~style_change_mask) | new_style;
        } else if (GWL_EXSTYLE == which) {
                ; /* FIXME - what is needed here */
        } else {
                WARN ("Invalid style change %#Ix.\n", which);
        }

        return 0;
}

/*********************************************************************
 *
 *      WM_SYSKEYDOWN
 *
 */
static LRESULT EDIT_WM_SysKeyDown(EDITSTATE *es, INT key, DWORD key_data)
{
        if ((key == VK_BACK) && (key_data & 0x2000)) {
                if (EDIT_EM_CanUndo(es))
                        EDIT_EM_Undo(es);
                return 0;
        } else if (key == VK_UP || key == VK_DOWN) {
                if (EDIT_CheckCombo(es, WM_SYSKEYDOWN, key))
                        return 0;
        }
        return DefWindowProcW(es->hwndSelf, WM_SYSKEYDOWN, key, key_data);
}

/*********************************************************************
 *
 *      WM_HSCROLL
 *
 */
static LRESULT EDIT_WM_HScroll(EDITSTATE *es, INT action, INT pos)
{
        INT dx;
        INT fw;

        if (!(es->style & ES_MULTILINE))
                return 0;

        if (!(es->style & ES_AUTOHSCROLL))
                return 0;

        dx = 0;
        fw = es->format_rect.right - es->format_rect.left;
        switch (action) {
        case SB_LINELEFT:
                TRACE("SB_LINELEFT\n");
                if (es->x_offset)
                        dx = -es->char_width;
                break;
        case SB_LINERIGHT:
                TRACE("SB_LINERIGHT\n");
                if (es->x_offset < es->text_width)
                        dx = es->char_width;
                break;
        case SB_PAGELEFT:
                TRACE("SB_PAGELEFT\n");
                if (es->x_offset)
                        dx = -fw / HSCROLL_FRACTION / es->char_width * es->char_width;
                break;
        case SB_PAGERIGHT:
                TRACE("SB_PAGERIGHT\n");
                if (es->x_offset < es->text_width)
                        dx = fw / HSCROLL_FRACTION / es->char_width * es->char_width;
                break;
        case SB_LEFT:
                TRACE("SB_LEFT\n");
                if (es->x_offset)
                        dx = -es->x_offset;
                break;
        case SB_RIGHT:
                TRACE("SB_RIGHT\n");
                if (es->x_offset < es->text_width)
                        dx = es->text_width - es->x_offset;
                break;
        case SB_THUMBTRACK:
                TRACE("SB_THUMBTRACK %d\n", pos);
                es->flags |= EF_HSCROLL_TRACK;
                if(es->style & WS_HSCROLL)
                    dx = pos - es->x_offset;
                else
                {
                    INT fw, new_x;
                    /* Sanity check */
                    if(pos < 0 || pos > 100) return 0;
                    /* Assume default scroll range 0-100 */
                    fw = es->format_rect.right - es->format_rect.left;
                    new_x = pos * (es->text_width - fw) / 100;
                    dx = es->text_width ? (new_x - es->x_offset) : 0;
                }
                break;
        case SB_THUMBPOSITION:
                TRACE("SB_THUMBPOSITION %d\n", pos);
                es->flags &= ~EF_HSCROLL_TRACK;
                if(GetWindowLongW( es->hwndSelf, GWL_STYLE ) & WS_HSCROLL)
                    dx = pos - es->x_offset;
                else
                {
                    INT fw, new_x;
                    /* Sanity check */
                    if(pos < 0 || pos > 100) return 0;
                    /* Assume default scroll range 0-100 */
                    fw = es->format_rect.right - es->format_rect.left;
                    new_x = pos * (es->text_width - fw) / 100;
                    dx = es->text_width ? (new_x - es->x_offset) : 0;
                }
                if (!dx) {
                        /* force scroll info update */
                        EDIT_UpdateScrollInfo(es);
                        notify_parent(es, EN_HSCROLL);
                }
                break;
        case SB_ENDSCROLL:
                TRACE("SB_ENDSCROLL\n");
                break;
        /*
         *      FIXME : the next two are undocumented !
         *      Are we doing the right thing ?
         *      At least Win 3.1 Notepad makes use of EM_GETTHUMB this way,
         *      although it's also a regular control message.
         */
        case EM_GETTHUMB: /* this one is used by NT notepad */
        {
                LRESULT ret;
                if(GetWindowLongW( es->hwndSelf, GWL_STYLE ) & WS_HSCROLL)
                    ret = GetScrollPos(es->hwndSelf, SB_HORZ);
                else
                {
                    /* Assume default scroll range 0-100 */
                    INT fw = es->format_rect.right - es->format_rect.left;
                    ret = es->text_width ? es->x_offset * 100 / (es->text_width - fw) : 0;
                }
                TRACE("EM_GETTHUMB: returning %Id\n", ret);
                return ret;
        }
        case EM_LINESCROLL:
                TRACE("EM_LINESCROLL16\n");
                dx = pos;
                break;

        default:
                ERR("undocumented WM_HSCROLL action %d (0x%04x), please report\n",
                    action, action);
                return 0;
        }
        if (dx)
        {
            INT fw = es->format_rect.right - es->format_rect.left;
            /* check if we are going to move too far */
            if(es->x_offset + dx + fw > es->text_width)
                dx = es->text_width - fw - es->x_offset;
            if(dx)
                EDIT_EM_LineScroll_internal(es, dx, 0);
        }
        return 0;
}


/*********************************************************************
 *
 *      WM_VSCROLL
 *
 */
static LRESULT EDIT_WM_VScroll(EDITSTATE *es, INT action, INT pos)
{
        INT dy;

        if (!(es->style & ES_MULTILINE))
                return 0;

        if (!(es->style & ES_AUTOVSCROLL))
                return 0;

        dy = 0;
        switch (action) {
        case SB_LINEUP:
        case SB_LINEDOWN:
        case SB_PAGEUP:
        case SB_PAGEDOWN:
                TRACE("action %d (%s)\n", action, (action == SB_LINEUP ? "SB_LINEUP" :
                                                   (action == SB_LINEDOWN ? "SB_LINEDOWN" :
                                                    (action == SB_PAGEUP ? "SB_PAGEUP" :
                                                     "SB_PAGEDOWN"))));
                EDIT_EM_Scroll(es, action);
                return 0;
        case SB_TOP:
                TRACE("SB_TOP\n");
                dy = -es->y_offset;
                break;
        case SB_BOTTOM:
                TRACE("SB_BOTTOM\n");
                dy = es->line_count - 1 - es->y_offset;
                break;
        case SB_THUMBTRACK:
                TRACE("SB_THUMBTRACK %d\n", pos);
                es->flags |= EF_VSCROLL_TRACK;
                if(es->style & WS_VSCROLL)
                    dy = pos - es->y_offset;
                else
                {
                    /* Assume default scroll range 0-100 */
                    INT vlc, new_y;
                    /* Sanity check */
                    if(pos < 0 || pos > 100) return 0;
                    vlc = get_vertical_line_count(es);
                    new_y = pos * (es->line_count - vlc) / 100;
                    dy = es->line_count ? (new_y - es->y_offset) : 0;
                    TRACE("line_count=%d, y_offset=%d, pos=%d, dy = %d\n",
                            es->line_count, es->y_offset, pos, dy);
                }
                break;
        case SB_THUMBPOSITION:
                TRACE("SB_THUMBPOSITION %d\n", pos);
                es->flags &= ~EF_VSCROLL_TRACK;
                if(es->style & WS_VSCROLL)
                    dy = pos - es->y_offset;
                else
                {
                    /* Assume default scroll range 0-100 */
                    INT vlc, new_y;
                    /* Sanity check */
                    if(pos < 0 || pos > 100) return 0;
                    vlc = get_vertical_line_count(es);
                    new_y = pos * (es->line_count - vlc) / 100;
                    dy = es->line_count ? (new_y - es->y_offset) : 0;
                    TRACE("line_count=%d, y_offset=%d, pos=%d, dy = %d\n",
                            es->line_count, es->y_offset, pos, dy);
                }
                if (!dy)
                {
                        /* force scroll info update */
                        EDIT_UpdateScrollInfo(es);
                        notify_parent(es, EN_VSCROLL);
                }
                break;
        case SB_ENDSCROLL:
                TRACE("SB_ENDSCROLL\n");
                break;
        /*
         *      FIXME : the next two are undocumented !
         *      Are we doing the right thing ?
         *      At least Win 3.1 Notepad makes use of EM_GETTHUMB this way,
         *      although it's also a regular control message.
         */
        case EM_GETTHUMB: /* this one is used by NT notepad */
        {
                LRESULT ret;
                if(GetWindowLongW( es->hwndSelf, GWL_STYLE ) & WS_VSCROLL)
                    ret = GetScrollPos(es->hwndSelf, SB_VERT);
                else
                {
                    /* Assume default scroll range 0-100 */
                    INT vlc = get_vertical_line_count(es);
                    ret = es->line_count ? es->y_offset * 100 / (es->line_count - vlc) : 0;
                }
                TRACE("EM_GETTHUMB: returning %Id\n", ret);
                return ret;
        }
        case EM_LINESCROLL:
                TRACE("EM_LINESCROLL %d\n", pos);
                dy = pos;
                break;

        default:
                ERR("undocumented WM_VSCROLL action %d (0x%04x), please report\n",
                    action, action);
                return 0;
        }
        if (dy)
                EDIT_EM_LineScroll(es, 0, dy);
        return 0;
}

/*********************************************************************
 *
 *      EM_GETTHUMB
 *
 *      FIXME: is this right ?  (or should it be only VSCROLL)
 *      (and maybe only for edit controls that really have their
 *      own scrollbars) (and maybe only for multiline controls ?)
 *      All in all: very poorly documented
 *
 */
static LRESULT EDIT_EM_GetThumb(EDITSTATE *es)
{
        return MAKELONG(EDIT_WM_VScroll(es, EM_GETTHUMB, 0),
                        EDIT_WM_HScroll(es, EM_GETTHUMB, 0));
}

/*********************************************************************
 *
 *      EM_SETCUEBANNER
 *
 */
static BOOL EDIT_EM_SetCueBanner(EDITSTATE *es, BOOL draw_focused, const WCHAR *cue_text)
{
    if (es->style & ES_MULTILINE || !cue_text)
        return FALSE;

    Free(es->cue_banner_text);
    es->cue_banner_text = wcsdup(cue_text);
    es->cue_banner_draw_focused = draw_focused;

    return TRUE;
}

/*********************************************************************
 *
 *      EM_GETCUEBANNER
 *
 */
static BOOL EDIT_EM_GetCueBanner(EDITSTATE *es, WCHAR *buf, DWORD size)
{
    if (es->style & ES_MULTILINE)
        return FALSE;

    if (!es->cue_banner_text)
    {
        if (buf && size)
            *buf = 0;
        return FALSE;
    }
    else
    {
        if (buf)
            lstrcpynW(buf, es->cue_banner_text, size);
        return TRUE;
    }
}


/********************************************************************
 *
 * The Following code is to handle inline editing from IMEs
 */

static void EDIT_GetResultStr(HIMC hIMC, EDITSTATE *es)
{
    LONG buflen;
    LPWSTR lpResultStr;

    buflen = ImmGetCompositionStringW(hIMC, GCS_RESULTSTR, NULL, 0);
    if (buflen <= 0)
    {
        return;
    }

    lpResultStr = Alloc(buflen);
    if (!lpResultStr)
    {
        ERR("Unable to alloc buffer for IME string\n");
        return;
    }

    ImmGetCompositionStringW(hIMC, GCS_RESULTSTR, lpResultStr, buflen);
    EDIT_EM_ReplaceSel(es, TRUE, lpResultStr, buflen / sizeof(WCHAR), TRUE, TRUE);
    Free(lpResultStr);
}

static void EDIT_ImeComposition(HWND hwnd, LPARAM CompFlag, EDITSTATE *es)
{
    HIMC hIMC;

    hIMC = ImmGetContext(hwnd);
    if (!hIMC)
        return;

    if (CompFlag & GCS_RESULTSTR)
        EDIT_GetResultStr(hIMC, es);

    ImmReleaseContext(hwnd, hIMC);
}


/*********************************************************************
 *
 *      WM_NCCREATE
 *
 * See also EDIT_WM_StyleChanged
 */
static LRESULT EDIT_WM_NCCreate(HWND hwnd, LPCREATESTRUCTW lpcs)
{
        EDITSTATE *es;
        UINT alloc_size;

    TRACE("Creating edit control, style = %#lx\n", lpcs->style);

    if (!(es = Alloc(sizeof(*es))))
        return FALSE;
    SetWindowLongPtrW( hwnd, 0, (LONG_PTR)es );

       /*
        *      Note: since the EDITSTATE has not been fully initialized yet,
        *            we can't use any API calls that may send
        *            WM_XXX messages before WM_NCCREATE is completed.
        */

    es->style = lpcs->style;

        es->bEnableState = !(es->style & WS_DISABLED);

        es->hwndSelf = hwnd;
        /* Save parent, which will be notified by EN_* messages */
        es->hwndParent = lpcs->hwndParent;

        if (es->style & ES_COMBO)
           es->hwndListBox = GetDlgItem(es->hwndParent, ID_CB_LISTBOX);

        /* FIXME: should we handle changes to WS_EX_RIGHT style after creation? */
        if (lpcs->dwExStyle & WS_EX_RIGHT) es->style |= ES_RIGHT;

        /* Number overrides lowercase overrides uppercase (at least it
         * does in Win95).  However I'll bet that ES_NUMBER would be
         * invalid under Win 3.1.
         */
        if (es->style & ES_NUMBER) {
                ; /* do not override the ES_NUMBER */
        }  else if (es->style & ES_LOWERCASE) {
                es->style &= ~ES_UPPERCASE;
        }
        if (es->style & ES_MULTILINE) {
                es->buffer_limit = BUFLIMIT_INITIAL;
                if (es->style & WS_VSCROLL)
                        es->style |= ES_AUTOVSCROLL;
                if (es->style & WS_HSCROLL)
                        es->style |= ES_AUTOHSCROLL;
                es->style &= ~ES_PASSWORD;
                if ((es->style & ES_CENTER) || (es->style & ES_RIGHT)) {
                        /* Confirmed - RIGHT overrides CENTER */
                        if (es->style & ES_RIGHT)
                                es->style &= ~ES_CENTER;
                        es->style &= ~WS_HSCROLL;
                        es->style &= ~ES_AUTOHSCROLL;
                }
        } else {
                es->buffer_limit = BUFLIMIT_INITIAL;
                if ((es->style & ES_RIGHT) && (es->style & ES_CENTER))
                        es->style &= ~ES_CENTER;
                es->style &= ~WS_HSCROLL;
                es->style &= ~WS_VSCROLL;
                if (es->style & ES_PASSWORD)
                        es->password_char = '*';
        }

        alloc_size = ROUND_TO_GROW((es->buffer_size + 1) * sizeof(WCHAR));
        if(!(es->hloc32W = LocalAlloc(LMEM_MOVEABLE | LMEM_ZEROINIT, alloc_size)))
            goto cleanup;
        es->buffer_size = LocalSize(es->hloc32W)/sizeof(WCHAR) - 1;

        if (!(es->undo_text = Alloc((es->buffer_size + 1) * sizeof(WCHAR))))
                goto cleanup;
        es->undo_buffer_size = es->buffer_size;

        if (es->style & ES_MULTILINE)
            if (!(es->first_line_def = Alloc(sizeof(LINEDEF))))
                goto cleanup;
        es->line_count = 1;

        /*
         * In Win95 look and feel, the WS_BORDER style is replaced by the
         * WS_EX_CLIENTEDGE style for the edit control. This gives the edit
         * control a nonclient area so we don't need to draw the border.
         * If WS_BORDER without WS_EX_CLIENTEDGE is specified we shouldn't have
         * a nonclient area and we should handle painting the border ourselves.
         *
         * When making modifications please ensure that the code still works
         * for edit controls created directly with style 0x50800000, exStyle 0
         * (which should have a single pixel border)
         */
        if (lpcs->dwExStyle & WS_EX_CLIENTEDGE)
                es->style &= ~WS_BORDER;
        else if (es->style & WS_BORDER)
                SetWindowLongW(hwnd, GWL_STYLE, es->style & ~WS_BORDER);

        return TRUE;

cleanup:
        SetWindowLongPtrW(es->hwndSelf, 0, 0);
        EDIT_InvalidateUniscribeData(es);
        Free(es->first_line_def);
        Free(es->undo_text);
        if (es->hloc32W) LocalFree(es->hloc32W);
        Free(es->logAttr);
        Free(es);
        return FALSE;
}


/*********************************************************************
 *
 *      WM_CREATE
 *
 */
static LRESULT EDIT_WM_Create(EDITSTATE *es, const WCHAR *name)
{
    RECT clientRect;

    TRACE("%s\n", debugstr_w(name));

    /*
     * To initialize some final structure members, we call some helper
     * functions.  However, since the EDITSTATE is not consistent (i.e.
     * not fully initialized), we should be very careful which
     * functions can be called, and in what order.
     */
    EDIT_WM_SetFont(es, 0, FALSE);
    EDIT_EM_EmptyUndoBuffer(es);

    /* We need to calculate the format rect
       (applications may send EM_SETMARGINS before the control gets visible) */
    GetClientRect(es->hwndSelf, &clientRect);
    EDIT_SetRectNP(es, &clientRect);

    if (name && *name)
    {
        EDIT_EM_ReplaceSel(es, FALSE, name, lstrlenW(name), FALSE, FALSE);
        /* if we insert text to the editline, the text scrolls out
         * of the window, as the caret is placed after the insert
         * pos normally; thus we reset es->selection... to 0 and
         * update caret
         */
        es->selection_start = es->selection_end = 0;
        /* Adobe Photoshop does NOT like this. and MSDN says that EN_CHANGE
         * Messages are only to be sent when the USER does something to
         * change the contents. So I am removing this EN_CHANGE
         *
         * EDIT_NOTIFY_PARENT(es, EN_CHANGE);
         */
        EDIT_EM_ScrollCaret(es);
    }

    /* force scroll info update */
    EDIT_UpdateScrollInfo(es);
    OpenThemeData(es->hwndSelf, WC_EDITW);

    /* The rule seems to return 1 here for success */
    /* Power Builder masked edit controls will crash  */
    /* if not. */
    /* FIXME: is that in all cases so ? */
    return 1;
}


/*********************************************************************
 *
 *      WM_NCDESTROY
 *
 */
static LRESULT EDIT_WM_NCDestroy(EDITSTATE *es)
{
    LINEDEF *pc, *pp;
    HTHEME theme;

    theme = GetWindowTheme(es->hwndSelf);
    CloseThemeData(theme);

    /* The app can own the text buffer handle */
    if (es->hloc32W && (es->hloc32W != es->hlocapp))
        LocalFree(es->hloc32W);

    EDIT_InvalidateUniscribeData(es);

    pc = es->first_line_def;
    while (pc)
    {
        pp = pc->next;
        Free(pc);
        pc = pp;
    }

    SetWindowLongPtrW( es->hwndSelf, 0, 0 );
    Free(es->undo_text);
    Free(es->cue_banner_text);
    Free(es);

    return 0;
}

static LRESULT CALLBACK EDIT_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    EDITSTATE *es = (EDITSTATE *)GetWindowLongPtrW(hwnd, 0);
    LRESULT result = 0;
    RECT *rect;
    POINT pt;

    TRACE("hwnd %p, msg %#x, wparam %Ix, lparam %Ix\n", hwnd, msg, wParam, lParam);

    if (!es && msg != WM_NCCREATE)
        return DefWindowProcW(hwnd, msg, wParam, lParam);

    if (es && (msg != WM_NCDESTROY))
        EDIT_LockBuffer(es);

    switch (msg)
    {
    case EM_GETSEL:
        result = EDIT_EM_GetSel(es, (UINT *)wParam, (UINT *)lParam);
        break;

    case EM_SETSEL:
        EDIT_EM_SetSel(es, wParam, lParam, FALSE);
        EDIT_EM_ScrollCaret(es);
        result = 1;
        break;

    case EM_GETRECT:
        rect = (RECT *)lParam;
        if (rect)
            *rect = es->format_rect;
        break;

    case EM_SETRECT:
        if ((es->style & ES_MULTILINE) && lParam)
        {
            EDIT_SetRectNP(es, (RECT *)lParam);
            EDIT_UpdateText(es, NULL, TRUE);
        }
        break;

    case EM_SETRECTNP:
        if ((es->style & ES_MULTILINE) && lParam)
            EDIT_SetRectNP(es, (LPRECT)lParam);
        break;

    case EM_SCROLL:
        result = EDIT_EM_Scroll(es, (INT)wParam);
        break;

    case EM_LINESCROLL:
        result = (LRESULT)EDIT_EM_LineScroll(es, (INT)wParam, (INT)lParam);
        break;

    case EM_SCROLLCARET:
        EDIT_EM_ScrollCaret(es);
        result = 1;
        break;

    case EM_GETMODIFY:
        result = ((es->flags & EF_MODIFIED) != 0);
        break;

    case EM_SETMODIFY:
        if (wParam)
            es->flags |= EF_MODIFIED;
        else
            es->flags &= ~(EF_MODIFIED | EF_UPDATE);  /* reset pending updates */
        break;

    case EM_GETLINECOUNT:
        result = (es->style & ES_MULTILINE) ? es->line_count : 1;
        break;

    case EM_LINEINDEX:
        result = (LRESULT)EDIT_EM_LineIndex(es, (INT)wParam);
        break;

    case EM_SETHANDLE:
        EDIT_EM_SetHandle(es, (HLOCAL)wParam);
        break;

    case EM_GETHANDLE:
        result = (LRESULT)EDIT_EM_GetHandle(es);
        break;

    case EM_GETTHUMB:
        result = EDIT_EM_GetThumb(es);
        break;

    /* these messages missing from specs */
    case 0x00bf:
    case 0x00c0:
    case 0x00c3:
    case 0x00ca:
        FIXME("undocumented message 0x%x, please report\n", msg);
        result = DefWindowProcW(hwnd, msg, wParam, lParam);
        break;

    case EM_LINELENGTH:
        result = (LRESULT)EDIT_EM_LineLength(es, (INT)wParam);
        break;

    case EM_REPLACESEL:
    {
        const WCHAR *textW = (const WCHAR *)lParam;

        EDIT_EM_ReplaceSel(es, (BOOL)wParam, textW, lstrlenW(textW), TRUE, TRUE);
        result = 1;
        break;
    }

    case EM_GETLINE:
        result = (LRESULT)EDIT_EM_GetLine(es, (INT)wParam, (LPWSTR)lParam);
        break;

    case EM_SETLIMITTEXT:
        EDIT_EM_SetLimitText(es, wParam);
        break;

    case EM_CANUNDO:
        result = (LRESULT)EDIT_EM_CanUndo(es);
        break;

    case EM_UNDO:
    case WM_UNDO:
        result = (LRESULT)EDIT_EM_Undo(es);
        break;

    case EM_FMTLINES:
        result = (LRESULT)EDIT_EM_FmtLines(es, (BOOL)wParam);
        break;

    case EM_LINEFROMCHAR:
        result = (LRESULT)EDIT_EM_LineFromChar(es, (INT)wParam);
        break;

    case EM_SETTABSTOPS:
        result = (LRESULT)EDIT_EM_SetTabStops(es, (INT)wParam, (LPINT)lParam);
        break;

    case EM_SETPASSWORDCHAR:
        EDIT_EM_SetPasswordChar(es, wParam);
        break;

    case EM_EMPTYUNDOBUFFER:
        EDIT_EM_EmptyUndoBuffer(es);
        break;

    case EM_GETFIRSTVISIBLELINE:
        result = (es->style & ES_MULTILINE) ? es->y_offset : es->x_offset;
        break;

    case EM_SETREADONLY:
    {
        DWORD old_style = es->style;

        if (wParam)
        {
            SetWindowLongW(hwnd, GWL_STYLE, GetWindowLongW(hwnd, GWL_STYLE) | ES_READONLY);
            es->style |= ES_READONLY;
        }
        else
        {
            SetWindowLongW(hwnd, GWL_STYLE, GetWindowLongW(hwnd, GWL_STYLE) & ~ES_READONLY);
            es->style &= ~ES_READONLY;
        }

        if (old_style ^ es->style)
            InvalidateRect(es->hwndSelf, NULL, TRUE);

        result = 1;
        break;
    }

    case EM_SETWORDBREAKPROC:
        EDIT_EM_SetWordBreakProc(es, (void *)lParam);
        result = 1;
        break;

    case EM_GETWORDBREAKPROC:
        result = (LRESULT)es->word_break_proc;
        break;

    case EM_GETPASSWORDCHAR:
        result = es->password_char;
        break;

    case EM_SETMARGINS:
        EDIT_EM_SetMargins(es, (INT)wParam, LOWORD(lParam), HIWORD(lParam), TRUE);
        break;

    case EM_GETMARGINS:
        result = MAKELONG(es->left_margin, es->right_margin);
        break;

    case EM_GETLIMITTEXT:
        result = es->buffer_limit;
        break;

    case EM_POSFROMCHAR:
        if ((INT)wParam >= get_text_length(es)) result = -1;
        else result = EDIT_EM_PosFromChar(es, (INT)wParam, FALSE);
        break;

    case EM_CHARFROMPOS:
        result = EDIT_EM_CharFromPos(es, (short)LOWORD(lParam), (short)HIWORD(lParam));
        break;

    case EM_SETCUEBANNER:
        result = EDIT_EM_SetCueBanner(es, (BOOL)wParam, (const WCHAR *)lParam);
        break;

    case EM_GETCUEBANNER:
        result = EDIT_EM_GetCueBanner(es, (WCHAR *)wParam, (DWORD)lParam);
        break;

    case EM_SETIMESTATUS:
        if (wParam == EMSIS_COMPOSITIONSTRING)
            es->ime_status = lParam & 0xFFFF;

        result = 1;
        break;

    case EM_GETIMESTATUS:
        result = wParam == EMSIS_COMPOSITIONSTRING ? es->ime_status : 1;
        break;

    /* End of the EM_ messages which were in numerical order; what order
     * are these in?  vaguely alphabetical?
     */

    case WM_NCCREATE:
        result = EDIT_WM_NCCreate(hwnd, (LPCREATESTRUCTW)lParam);
        break;

    case WM_NCDESTROY:
        result = EDIT_WM_NCDestroy(es);
        es = NULL;
        break;

    case WM_GETDLGCODE:
        result = DLGC_HASSETSEL | DLGC_WANTCHARS | DLGC_WANTARROWS;

        if (es->style & ES_MULTILINE)
            result |= DLGC_WANTALLKEYS;

        if (lParam)
        {
            MSG *msg = (MSG *)lParam;
            es->flags |= EF_DIALOGMODE;

            if (msg->message == WM_KEYDOWN)
            {
                int vk = (int)msg->wParam;

                if (es->hwndListBox)
                {
                    if (vk == VK_RETURN || vk == VK_ESCAPE)
                        if (SendMessageW(GetParent(hwnd), CB_GETDROPPEDSTATE, 0, 0))
                            result |= DLGC_WANTMESSAGE;
                }
            }
        }
        break;

    case WM_CHAR:
    {
        WCHAR charW = wParam;

        if (es->hwndListBox)
        {
            if (charW == VK_RETURN || charW == VK_ESCAPE)
            {
                if (SendMessageW(GetParent(hwnd), CB_GETDROPPEDSTATE, 0, 0))
                    SendMessageW(GetParent(hwnd), WM_KEYDOWN, charW, 0);
                break;
            }
        }
        result = EDIT_WM_Char(es, charW);
        break;
    }

    case WM_UNICHAR:
        if (wParam == UNICODE_NOCHAR) return TRUE;
        if (wParam <= 0x000fffff)
        {
            if (wParam > 0xffff) /* convert to surrogates */
            {
                wParam -= 0x10000;
                EDIT_WM_Char(es, (wParam >> 10) + 0xd800);
                EDIT_WM_Char(es, (wParam & 0x03ff) + 0xdc00);
            }
            else
                EDIT_WM_Char(es, wParam);
        }
        return 0;

    case WM_CLEAR:
        EDIT_WM_Clear(es);
        break;

    case WM_CONTEXTMENU:
        EDIT_WM_ContextMenu(es, (short)LOWORD(lParam), (short)HIWORD(lParam));
        break;

    case WM_COPY:
        EDIT_WM_Copy(es);
        break;

    case WM_CREATE:
        result = EDIT_WM_Create(es, ((LPCREATESTRUCTW)lParam)->lpszName);
        break;

    case WM_CUT:
        EDIT_WM_Cut(es);
        break;

    case WM_ENABLE:
        es->bEnableState = (BOOL) wParam;
        EDIT_UpdateText(es, NULL, TRUE);
        if (GetWindowTheme(hwnd))
            RedrawWindow(hwnd, NULL, NULL, RDW_FRAME | RDW_INVALIDATE | RDW_UPDATENOW);
        break;

    case WM_ERASEBKGND:
        /* we do the proper erase in EDIT_WM_Paint */
        result = 1;
        break;

    case WM_GETFONT:
        result = (LRESULT)es->font;
        break;

    case WM_GETTEXT:
        result = (LRESULT)EDIT_WM_GetText(es, (INT)wParam, (LPWSTR)lParam);
        break;

    case WM_GETTEXTLENGTH:
        result = get_text_length(es);
        break;

    case WM_HSCROLL:
        result = EDIT_WM_HScroll(es, LOWORD(wParam), (short)HIWORD(wParam));
        break;

    case WM_KEYDOWN:
        result = EDIT_WM_KeyDown(es, (INT)wParam);
        break;

    case WM_KILLFOCUS:
        result = EDIT_WM_KillFocus(GetWindowTheme(hwnd), es);
        break;

    case WM_LBUTTONDBLCLK:
        result = EDIT_WM_LButtonDblClk(es);
        break;

    case WM_LBUTTONDOWN:
        result = EDIT_WM_LButtonDown(es, wParam, (short)LOWORD(lParam), (short)HIWORD(lParam));
        break;

    case WM_LBUTTONUP:
        result = EDIT_WM_LButtonUp(es);
        break;

    case WM_MBUTTONDOWN:
        result = EDIT_WM_MButtonDown(es);
        break;

    case WM_MOUSEMOVE:
        result = EDIT_WM_MouseMove(es, (short)LOWORD(lParam), (short)HIWORD(lParam));
        break;

    case WM_PRINTCLIENT:
    case WM_PAINT:
        EDIT_WM_Paint(es, (HDC)wParam);
        break;

    case WM_NCPAINT:
        EDIT_WM_NCPaint(hwnd, (HRGN)wParam);
        break;

    case WM_PASTE:
        EDIT_WM_Paste(es);
        break;

    case WM_SETFOCUS:
        EDIT_WM_SetFocus(GetWindowTheme(hwnd), es);
        break;

    case WM_SETFONT:
        EDIT_WM_SetFont(es, (HFONT)wParam, LOWORD(lParam) != 0);
        break;

    case WM_SETREDRAW:
        /* FIXME: actually set an internal flag and behave accordingly */
        break;

    case WM_SETTEXT:
        EDIT_WM_SetText(es, (const WCHAR *)lParam);
        result = TRUE;
        break;

    case WM_SIZE:
        EDIT_WM_Size(es, (UINT)wParam);
        break;

    case WM_STYLECHANGED:
        result = EDIT_WM_StyleChanged(es, wParam, (const STYLESTRUCT *)lParam);
        break;

    case WM_STYLECHANGING:
        result = 0; /* See EDIT_WM_StyleChanged */
        break;

    case WM_SYSKEYDOWN:
        result = EDIT_WM_SysKeyDown(es, (INT)wParam, (DWORD)lParam);
        break;

    case WM_VSCROLL:
        result = EDIT_WM_VScroll(es, LOWORD(wParam), (short)HIWORD(wParam));
        break;

    case WM_MOUSEWHEEL:
    {
        int wheelDelta;
        INT pulScrollLines = 3;
        SystemParametersInfoW(SPI_GETWHEELSCROLLLINES,0, &pulScrollLines, 0);

        if (wParam & (MK_SHIFT | MK_CONTROL))
        {
            result = DefWindowProcW(hwnd, msg, wParam, lParam);
            break;
        }

        wheelDelta = GET_WHEEL_DELTA_WPARAM(wParam);
        /* if scrolling changes direction, ignore left overs */
        if ((wheelDelta < 0 && es->wheelDeltaRemainder < 0) ||
               (wheelDelta > 0 && es->wheelDeltaRemainder > 0))
                es->wheelDeltaRemainder += wheelDelta;
        else
            es->wheelDeltaRemainder = wheelDelta;

        if (es->wheelDeltaRemainder && pulScrollLines)
        {
            int cLineScroll;
            pulScrollLines = min(es->line_count, pulScrollLines);
            cLineScroll = pulScrollLines * es->wheelDeltaRemainder / WHEEL_DELTA;
            es->wheelDeltaRemainder -= WHEEL_DELTA * cLineScroll / pulScrollLines;
            result = EDIT_EM_LineScroll(es, 0, -cLineScroll);
        }
        break;
    }

    /* IME messages to make the edit control IME aware */
    case WM_IME_SETCONTEXT:
        GetCaretPos(&pt);
        EDIT_UpdateImmCompositionWindow(es, pt.x, pt.y);
        EDIT_UpdateImmCompositionFont(es);
        break;

    case WM_IME_COMPOSITION:
        EDIT_EM_ReplaceSel(es, TRUE, NULL, 0, TRUE, TRUE);
        if ((lParam & GCS_RESULTSTR) && (es->ime_status & EIMES_GETCOMPSTRATONCE))
            EDIT_ImeComposition(hwnd, lParam, es);
        return DefWindowProcW(hwnd, msg, wParam, lParam);

    case WM_IME_SELECT:
        break;

    case WM_IME_CONTROL:
        break;

    case WM_IME_REQUEST:
        switch (wParam)
        {
            case IMR_QUERYCHARPOSITION:
            {
                IMECHARPOSITION *chpos = (IMECHARPOSITION *)lParam;
                LRESULT pos;

                pos = EDIT_EM_PosFromChar(es, es->selection_start + chpos->dwCharPos, FALSE);
                chpos->pt.x = LOWORD(pos);
                chpos->pt.y = HIWORD(pos);
                chpos->cLineHeight = es->line_height;
                chpos->rcDocument = es->format_rect;
                MapWindowPoints(hwnd, 0, &chpos->pt, 1);
                MapWindowPoints(hwnd, 0, (POINT*)&chpos->rcDocument, 2);
                result = 1;
                break;
            }
        }
        break;

    case WM_THEMECHANGED:
        CloseThemeData(GetWindowTheme(hwnd));
        OpenThemeData(hwnd, WC_EDITW);
        InvalidateRect(hwnd, NULL, TRUE);
        break;

    default:
        result = DefWindowProcW(hwnd, msg, wParam, lParam);
        break;
    }

    if (IsWindow(hwnd) && es && msg != EM_GETHANDLE)
        EDIT_UnlockBuffer(es, FALSE);

    TRACE("hwnd=%p msg=%x -- %#Ix\n", hwnd, msg, result);

    return result;
}

void EDIT_Register(void)
{
    WNDCLASSW wndClass;

    memset(&wndClass, 0, sizeof(wndClass));
    wndClass.style = CS_PARENTDC | CS_GLOBALCLASS | CS_DBLCLKS;
    wndClass.lpfnWndProc = EDIT_WindowProc;
    wndClass.cbClsExtra = 0;
#ifdef __i386__
    wndClass.cbWndExtra = sizeof(EDITSTATE *) + sizeof(WORD);
#else
    wndClass.cbWndExtra = sizeof(EDITSTATE *);
#endif
    wndClass.hCursor = LoadCursorW(0, (LPWSTR)IDC_IBEAM);
    wndClass.hbrBackground = NULL;
    wndClass.lpszClassName = WC_EDITW;
    RegisterClassW(&wndClass);
}