dlls/comctl32/theme_combo.c

   1 /*
   2  * Theming - Combo box control
   3  *
   4  * Copyright (c) 2005 by Frank Richter
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  */
  21
  22 #include <stdarg.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "wingdi.h"
  29 #include "winuser.h"
  30 #include "uxtheme.h"
  31 #include "vssym32.h"
  32 #include "comctl32.h"
  33 #include "wine/debug.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(themingcombo);
  36
  37 /* Subclass-private state flags */
  38 #define STATE_NOREDRAW         1
  39 #define STATE_HOT              2
  40
  41 /* some constants for metrics, same as in user32 */
  42 #define COMBO_XBORDERSIZE      2
  43 #define COMBO_YBORDERSIZE      2
  44 #define COMBO_EDITBUTTONSPACE  0
  45 #define EDIT_CONTROL_PADDING   1
  46
  47 /* paint text of combobox, needed for read-only drop downs. */
  48 static void paint_text (HWND hwnd, HDC hdc, DWORD dwStyle, const COMBOBOXINFO *cbi)
  49 {
  50     INT  id, size = 0;
  51     LPWSTR pText = NULL;
  52     UINT itemState = ODS_COMBOBOXEDIT;
  53     HFONT font = (HFONT)SendMessageW (hwnd, WM_GETFONT, 0, 0);
  54     HFONT hPrevFont = (font) ? SelectObject(hdc, font) : 0;
  55     RECT rectEdit;
  56     BOOL focused = GetFocus () == hwnd;
  57     BOOL dropped = cbi->stateButton == STATE_SYSTEM_PRESSED;
  58
  59     TRACE("\n");
  60
  61     /* follow Windows combobox that sends a bunch of text
  62      * inquiries to its listbox while processing WM_PAINT. */
  63
  64     if( (id = SendMessageW (cbi->hwndList, LB_GETCURSEL, 0, 0) ) != LB_ERR )
  65     {
  66         size = SendMessageW (cbi->hwndList, LB_GETTEXTLEN, id, 0);
  67         if (size == LB_ERR)
  68           FIXME("LB_ERR probably not handled yet\n");
  69         if( (pText = HeapAlloc( GetProcessHeap(), 0, (size + 1) * sizeof(WCHAR))) )
  70         {
  71             /* size from LB_GETTEXTLEN may be too large, from LB_GETTEXT is accurate */
  72             size = SendMessageW (cbi->hwndList, LB_GETTEXT, id, (LPARAM)pText);
  73             pText[size] = '\0'; /* just in case */
  74         } else return;
  75     }
  76     else
  77        if( !(dwStyle & (CBS_OWNERDRAWFIXED | CBS_OWNERDRAWVARIABLE)) )
  78            return;
  79
  80     /*
  81      * Give ourselves some space.
  82      */
  83     CopyRect (&rectEdit, &cbi->rcItem);
  84     InflateRect( &rectEdit, -1, -1 );
  85
  86     if(dwStyle & (CBS_OWNERDRAWFIXED | CBS_OWNERDRAWVARIABLE))
  87     {
  88        DRAWITEMSTRUCT dis;
  89        HRGN           clipRegion;
  90        UINT ctlid = (UINT)GetWindowLongPtrW( hwnd, GWLP_ID );
  91
  92        /* setup state for DRAWITEM message. Owner will highlight */
  93        if ( focused && !dropped )
  94            itemState |= ODS_SELECTED | ODS_FOCUS;
  95
  96        /*
  97         * Save the current clip region.
  98         * To retrieve the clip region, we need to create one "dummy"
  99         * clip region.
 100         */
 101        clipRegion = CreateRectRgnIndirect(&rectEdit);
 102
 103        if (GetClipRgn(hdc, clipRegion)!=1)
 104        {
 105          DeleteObject(clipRegion);
 106          clipRegion=NULL;
 107        }
 108
 109        if (!IsWindowEnabled(hwnd)) itemState |= ODS_DISABLED;
 110
 111        dis.CtlType      = ODT_COMBOBOX;
 112        dis.CtlID        = ctlid;
 113        dis.hwndItem     = hwnd;
 114        dis.itemAction   = ODA_DRAWENTIRE;
 115        dis.itemID       = id;
 116        dis.itemState    = itemState;
 117        dis.hDC          = hdc;
 118        dis.rcItem       = rectEdit;
 119        dis.itemData     = SendMessageW(cbi->hwndList, LB_GETITEMDATA, id, 0);
 120
 121        /*
 122         * Clip the DC and have the parent draw the item.
 123         */
 124        IntersectClipRect(hdc,
 125                          rectEdit.left,  rectEdit.top,
 126                          rectEdit.right, rectEdit.bottom);
 127
 128        SendMessageW(GetParent (hwnd), WM_DRAWITEM, ctlid, (LPARAM)&dis );
 129
 130        /*
 131         * Reset the clipping region.
 132         */
 133        SelectClipRgn(hdc, clipRegion);
 134     }
 135     else
 136     {
 137        static const WCHAR empty_stringW[] = { 0 };
 138
 139        if ( focused && !dropped ) {
 140
 141            /* highlight */
 142            FillRect( hdc, &rectEdit, GetSysColorBrush(COLOR_HIGHLIGHT) );
 143            SetBkColor( hdc, GetSysColor( COLOR_HIGHLIGHT ) );
 144            SetTextColor( hdc, GetSysColor( COLOR_HIGHLIGHTTEXT ) );
 145       }
 146
 147       ExtTextOutW( hdc,
 148                    rectEdit.left + 1,
 149                    rectEdit.top + 1,
 150                    ETO_OPAQUE | ETO_CLIPPED,
 151                    &rectEdit,
 152                    pText ? pText : empty_stringW , size, NULL );
 153
 154       if ( focused && !dropped )
 155         DrawFocusRect( hdc, &rectEdit );
 156     }
 157
 158     if( hPrevFont )
 159       SelectObject(hdc, hPrevFont );
 160
 161     HeapFree( GetProcessHeap(), 0, pText );
 162 }
 163
 164 /* paint the combobox */
 165 static LRESULT paint (HTHEME theme, HWND hwnd, HDC hParamDC, ULONG state)
 166 {
 167   PAINTSTRUCT ps;
 168   HDC   hDC;
 169   COMBOBOXINFO cbi;
 170   DWORD dwStyle = GetWindowLongW (hwnd, GWL_STYLE);
 171
 172   hDC = (hParamDC) ? hParamDC
 173                    : BeginPaint( hwnd, &ps);
 174
 175   TRACE("hdc=%p\n", hDC);
 176
 177   if( hDC && !(state & STATE_NOREDRAW) )
 178   {
 179       RECT frameRect;
 180       int buttonState;
 181
 182       cbi.cbSize = sizeof (cbi);
 183       SendMessageW (hwnd, CB_GETCOMBOBOXINFO, 0, (LPARAM)&cbi);
 184
 185       /* paint border */
 186       if ((dwStyle & CBS_DROPDOWNLIST) != CBS_SIMPLE)
 187           GetClientRect (hwnd, &frameRect);
 188       else
 189       {
 190           CopyRect (&frameRect, &cbi.rcItem);
 191
 192           InflateRect(&frameRect,
 193               EDIT_CONTROL_PADDING + COMBO_XBORDERSIZE,
 194               EDIT_CONTROL_PADDING + COMBO_YBORDERSIZE);
 195       }
 196
 197       DrawThemeBackground (theme, hDC, 0,
 198           IsWindowEnabled (hwnd) ? CBXS_NORMAL : CBXS_DISABLED, &frameRect, NULL);
 199
 200       /* paint button */
 201       if (cbi.stateButton != STATE_SYSTEM_INVISIBLE)
 202       {
 203           if (!IsWindowEnabled (hwnd))
 204               buttonState = CBXS_DISABLED;
 205           else if (cbi.stateButton == STATE_SYSTEM_PRESSED)
 206               buttonState = CBXS_PRESSED;
 207           else if (state & STATE_HOT)
 208               buttonState = CBXS_HOT;
 209           else
 210               buttonState = CBXS_NORMAL;
 211           DrawThemeBackground (theme, hDC, CP_DROPDOWNBUTTON, buttonState,
 212               &cbi.rcButton, NULL);
 213       }
 214
 215       /* paint text, if we need to */
 216       if ((dwStyle & CBS_DROPDOWNLIST) == CBS_DROPDOWNLIST)
 217           paint_text (hwnd, hDC, dwStyle, &cbi);
 218   }
 219
 220   if( !hParamDC )
 221     EndPaint(hwnd, &ps);
 222
 223   return 0;
 224 }
 225
 226
 227 /**********************************************************************
 228  * The combo control subclass window proc.
 229  */
 230 LRESULT CALLBACK THEMING_ComboSubclassProc (HWND hwnd, UINT msg,
 231                                             WPARAM wParam, LPARAM lParam,
 232                                             ULONG_PTR dwRefData)
 233 {
 234     const WCHAR* themeClass = WC_COMBOBOXW;
 235     HTHEME theme;
 236     LRESULT result;
 237
 238     switch (msg)
 239     {
 240     case WM_CREATE:
 241         result = THEMING_CallOriginalClass  (hwnd, msg, wParam, lParam);
 242         OpenThemeData( hwnd, themeClass );
 243         return result;
 244
 245     case WM_DESTROY:
 246         theme = GetWindowTheme( hwnd );
 247         CloseThemeData ( theme );
 248         return THEMING_CallOriginalClass (hwnd, msg, wParam, lParam);
 249
 250     case WM_THEMECHANGED:
 251         theme = GetWindowTheme( hwnd );
 252         CloseThemeData ( theme );
 253         OpenThemeData( hwnd, themeClass );
 254         break;
 255
 256     case WM_SYSCOLORCHANGE:
 257         theme = GetWindowTheme( hwnd );
 258         if (!theme) return THEMING_CallOriginalClass (hwnd, msg, wParam, lParam);
 259         /* Do nothing. When themed, a WM_THEMECHANGED will be received, too,
 260          * which will do the repaint. */
 261         break;
 262
 263     case WM_PAINT:
 264         theme = GetWindowTheme( hwnd );
 265         if (!theme) return THEMING_CallOriginalClass (hwnd, msg, wParam, lParam);
 266         return paint (theme, hwnd, (HDC)wParam, dwRefData);
 267
 268     case WM_SETREDRAW:
 269         /* Since there doesn't seem to be WM_GETREDRAW, do redraw tracking in
 270          * the subclass as well. */
 271         if( wParam )
 272             dwRefData &= ~STATE_NOREDRAW;
 273         else
 274             dwRefData |= STATE_NOREDRAW;
 275         THEMING_SetSubclassData (hwnd, dwRefData);
 276         return THEMING_CallOriginalClass (hwnd, msg, wParam, lParam);
 277
 278     case WM_MOUSEMOVE:
 279         {
 280             /* Dropdown button hot-tracking */
 281             COMBOBOXINFO cbi;
 282             POINT pt;
 283
 284             pt.x = (short)LOWORD(lParam);
 285             pt.y = (short)HIWORD(lParam);
 286             cbi.cbSize = sizeof (cbi);
 287             SendMessageW (hwnd, CB_GETCOMBOBOXINFO, 0, (LPARAM)&cbi);
 288
 289             if (cbi.stateButton != STATE_SYSTEM_INVISIBLE)
 290             {
 291                 if (PtInRect (&cbi.rcButton, pt))
 292                 {
 293                     if (!(dwRefData & STATE_HOT))
 294                     {
 295                         dwRefData |= STATE_HOT;
 296                         THEMING_SetSubclassData (hwnd, dwRefData);
 297                         RedrawWindow (hwnd, &cbi.rcButton, 0,
 298                             RDW_INVALIDATE | RDW_UPDATENOW);
 299                     }
 300                 }
 301                 else
 302                 {
 303                     if (dwRefData & STATE_HOT)
 304                     {
 305                         dwRefData &= ~STATE_HOT;
 306                         THEMING_SetSubclassData (hwnd, dwRefData);
 307                         RedrawWindow (hwnd, &cbi.rcButton, 0,
 308                             RDW_INVALIDATE | RDW_UPDATENOW);
 309                     }
 310                 }
 311             }
 312         }
 313         return THEMING_CallOriginalClass (hwnd, msg, wParam, lParam);
 314
 315     default:
 316         /* Call old proc */
 317         return THEMING_CallOriginalClass (hwnd, msg, wParam, lParam);
 318     }
 319     return 0;
 320 }