Set 'backspace' in the system vimrc

[MacVim.git] / src / gui_beval.c

/* vi:set ts=8 sts=4 sw=4:
 *
 * VIM - Vi IMproved    by Bram Moolenaar
 *                      Visual Workshop integration by Gordon Prieur
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

#include "vim.h"

#if defined(FEAT_BEVAL) || defined(PROTO)

/*
 * Common code, invoked when the mouse is resting for a moment.
 */
/*ARGSUSED*/
    void
general_beval_cb(beval, state)
    BalloonEval *beval;
    int state;
{
    win_T       *wp;
    int         col;
    int         use_sandbox;
    linenr_T    lnum;
    char_u      *text;
    static char_u  *result = NULL;
    long        winnr = 0;
    char_u      *bexpr;
    buf_T       *save_curbuf;
#ifdef FEAT_WINDOWS
    win_T       *cw;
#endif
    static int  recursive = FALSE;

    /* Don't do anything when 'ballooneval' is off, messages scrolled the
     * windows up or we have no beval area. */
    if (!p_beval || balloonEval == NULL || msg_scrolled > 0)
        return;

    /* Don't do this recursively.  Happens when the expression evaluation
     * takes a long time and invokes something that checks for CTRL-C typed. */
    if (recursive)
        return;
    recursive = TRUE;

#ifdef FEAT_EVAL
    if (get_beval_info(balloonEval, TRUE, &wp, &lnum, &text, &col) == OK)
    {
        bexpr = (*wp->w_buffer->b_p_bexpr == NUL) ? p_bexpr
                                                    : wp->w_buffer->b_p_bexpr;
        if (*bexpr != NUL)
        {
# ifdef FEAT_WINDOWS
            /* Convert window pointer to number. */
            for (cw = firstwin; cw != wp; cw = cw->w_next)
                ++winnr;
# endif

            set_vim_var_nr(VV_BEVAL_BUFNR, (long)wp->w_buffer->b_fnum);
            set_vim_var_nr(VV_BEVAL_WINNR, winnr);
            set_vim_var_nr(VV_BEVAL_LNUM, (long)lnum);
            set_vim_var_nr(VV_BEVAL_COL, (long)(col + 1));
            set_vim_var_string(VV_BEVAL_TEXT, text, -1);
            vim_free(text);

            /*
             * Temporarily change the curbuf, so that we can determine whether
             * the buffer-local balloonexpr option was set insecurely.
             */
            save_curbuf = curbuf;
            curbuf = wp->w_buffer;
            use_sandbox = was_set_insecurely((char_u *)"balloonexpr",
                                 *curbuf->b_p_bexpr == NUL ? 0 : OPT_LOCAL);
            curbuf = save_curbuf;
            if (use_sandbox)
                ++sandbox;
            ++textlock;

            vim_free(result);
            result = eval_to_string(bexpr, NULL, TRUE);

            if (use_sandbox)
                --sandbox;
            --textlock;

            set_vim_var_string(VV_BEVAL_TEXT, NULL, -1);
            if (result != NULL && result[0] != NUL)
            {
                gui_mch_post_balloon(beval, result);
                recursive = FALSE;
                return;
            }
        }
    }
#endif
#ifdef FEAT_NETBEANS_INTG
    if (bevalServers & BEVAL_NETBEANS)
        netbeans_beval_cb(beval, state);
#endif
#ifdef FEAT_SUN_WORKSHOP
    if (bevalServers & BEVAL_WORKSHOP)
        workshop_beval_cb(beval, state);
#endif

    recursive = FALSE;
}

/* on Win32 only get_beval_info() is required */
#if !defined(FEAT_GUI_W32) || defined(PROTO)

#ifdef FEAT_GUI_GTK
# include <gdk/gdkkeysyms.h>
# include <gtk/gtk.h>
#else
# include <X11/keysym.h>
# ifdef FEAT_GUI_MOTIF
#  include <Xm/PushB.h>
#  include <Xm/Separator.h>
#  include <Xm/List.h>
#  include <Xm/Label.h>
#  include <Xm/AtomMgr.h>
#  include <Xm/Protocols.h>
# else
   /* Assume Athena */
#  include <X11/Shell.h>
#  ifdef FEAT_GUI_NEXTAW
#   include <X11/neXtaw/Label.h>
#  else
#   include <X11/Xaw/Label.h>
#  endif
# endif
#endif

#include "gui_beval.h"

#ifndef FEAT_GUI_GTK
extern Widget vimShell;

/*
 * Currently, we assume that there can be only one BalloonEval showing
 * on-screen at any given moment.  This variable will hold the currently
 * showing BalloonEval or NULL if none is showing.
 */
static BalloonEval *current_beval = NULL;
#endif

#ifdef FEAT_GUI_GTK
static void addEventHandler __ARGS((GtkWidget *, BalloonEval *));
static void removeEventHandler __ARGS((BalloonEval *));
static gint target_event_cb __ARGS((GtkWidget *, GdkEvent *, gpointer));
static gint mainwin_event_cb __ARGS((GtkWidget *, GdkEvent *, gpointer));
static void pointer_event __ARGS((BalloonEval *, int, int, unsigned));
static void key_event __ARGS((BalloonEval *, unsigned, int));
static gint timeout_cb __ARGS((gpointer));
static gint balloon_expose_event_cb __ARGS((GtkWidget *, GdkEventExpose *, gpointer));
# ifndef HAVE_GTK2
static void balloon_draw_cb __ARGS((GtkWidget *, GdkRectangle *, gpointer));
# endif
#else
static void addEventHandler __ARGS((Widget, BalloonEval *));
static void removeEventHandler __ARGS((BalloonEval *));
static void pointerEventEH __ARGS((Widget, XtPointer, XEvent *, Boolean *));
static void pointerEvent __ARGS((BalloonEval *, XEvent *));
static void timerRoutine __ARGS((XtPointer, XtIntervalId *));
#endif
static void cancelBalloon __ARGS((BalloonEval *));
static void requestBalloon __ARGS((BalloonEval *));
static void drawBalloon __ARGS((BalloonEval *));
static void undrawBalloon __ARGS((BalloonEval *beval));
static void createBalloonEvalWindow __ARGS((BalloonEval *));



/*
 * Create a balloon-evaluation area for a Widget.
 * There can be either a "mesg" for a fixed string or "mesgCB" to generate a
 * message by calling this callback function.
 * When "mesg" is not NULL it must remain valid for as long as the balloon is
 * used.  It is not freed here.
 * Returns a pointer to the resulting object (NULL when out of memory).
 */
    BalloonEval *
gui_mch_create_beval_area(target, mesg, mesgCB, clientData)
    void        *target;
    char_u      *mesg;
    void        (*mesgCB)__ARGS((BalloonEval *, int));
    void        *clientData;
{
#ifndef FEAT_GUI_GTK
    char        *display_name;      /* get from gui.dpy */
    int         screen_num;
    char        *p;
#endif
    BalloonEval *beval;

    if (mesg != NULL && mesgCB != NULL)
    {
        EMSG(_("E232: Cannot create BalloonEval with both message and callback"));
        return NULL;
    }

    beval = (BalloonEval *)alloc(sizeof(BalloonEval));
    if (beval != NULL)
    {
#ifdef FEAT_GUI_GTK
        beval->target = GTK_WIDGET(target);
        beval->balloonShell = NULL;
        beval->timerID = 0;
#else
        beval->target = (Widget)target;
        beval->balloonShell = NULL;
        beval->timerID = (XtIntervalId)NULL;
        beval->appContext = XtWidgetToApplicationContext((Widget)target);
#endif
        beval->showState = ShS_NEUTRAL;
        beval->x = 0;
        beval->y = 0;
        beval->msg = mesg;
        beval->msgCB = mesgCB;
        beval->clientData = clientData;

        /*
         * Set up event handler which will keep its eyes on the pointer,
         * and when the pointer rests in a certain spot for a given time
         * interval, show the beval.
         */
        addEventHandler(beval->target, beval);
        createBalloonEvalWindow(beval);

#ifndef FEAT_GUI_GTK
        /*
         * Now create and save the screen width and height. Used in drawing.
         */
        display_name = DisplayString(gui.dpy);
        p = strrchr(display_name, '.');
        if (p != NULL)
            screen_num = atoi(++p);
        else
            screen_num = 0;
        beval->screen_width = DisplayWidth(gui.dpy, screen_num);
        beval->screen_height = DisplayHeight(gui.dpy, screen_num);
#endif
    }

    return beval;
}

#if defined(FEAT_BEVAL_TIP) || defined(PROTO)
/*
 * Destroy a balloon-eval and free its associated memory.
 */
    void
gui_mch_destroy_beval_area(beval)
    BalloonEval *beval;
{
    cancelBalloon(beval);
    removeEventHandler(beval);
    /* Children will automatically be destroyed */
# ifdef FEAT_GUI_GTK
    gtk_widget_destroy(beval->balloonShell);
# else
    XtDestroyWidget(beval->balloonShell);
# endif
    vim_free(beval);
}
#endif

    void
gui_mch_enable_beval_area(beval)
    BalloonEval *beval;
{
    if (beval != NULL)
        addEventHandler(beval->target, beval);
}

    void
gui_mch_disable_beval_area(beval)
    BalloonEval *beval;
{
    if (beval != NULL)
        removeEventHandler(beval);
}

#if defined(FEAT_BEVAL_TIP) || defined(PROTO)
/*
 * This function returns the BalloonEval * associated with the currently
 * displayed tooltip.  Returns NULL if there is no tooltip currently showing.
 *
 * Assumption: Only one tooltip can be shown at a time.
 */
    BalloonEval *
gui_mch_currently_showing_beval()
{
    return current_beval;
}
#endif
#endif /* !FEAT_GUI_W32 */

#if defined(FEAT_SUN_WORKSHOP) || defined(FEAT_NETBEANS_INTG) \
    || defined(FEAT_EVAL) || defined(PROTO)
/*
 * Get the text and position to be evaluated for "beval".
 * If "getword" is true the returned text is not the whole line but the
 * relevant word in allocated memory.
 * Returns OK or FAIL.
 */
    int
get_beval_info(beval, getword, winp, lnump, textp, colp)
    BalloonEval *beval;
    int         getword;
    win_T       **winp;
    linenr_T    *lnump;
    char_u      **textp;
    int         *colp;
{
    win_T       *wp;
    int         row, col;
    char_u      *lbuf;
    linenr_T    lnum;

    *textp = NULL;
    row = Y_2_ROW(beval->y);
    col = X_2_COL(beval->x);
#ifdef FEAT_WINDOWS
    wp = mouse_find_win(&row, &col);
#else
    wp = firstwin;
#endif
    if (wp != NULL && row < wp->w_height && col < W_WIDTH(wp))
    {
        /* Found a window and the cursor is in the text.  Now find the line
         * number. */
        if (!mouse_comp_pos(wp, &row, &col, &lnum))
        {
            /* Not past end of the file. */
            lbuf = ml_get_buf(wp->w_buffer, lnum, FALSE);
            if (col <= win_linetabsize(wp, lbuf, (colnr_T)MAXCOL))
            {
                /* Not past end of line. */
                if (getword)
                {
                    /* For Netbeans we get the relevant part of the line
                     * instead of the whole line. */
                    int         len;
                    pos_T       *spos = NULL, *epos = NULL;

                    if (VIsual_active)
                    {
                        if (lt(VIsual, curwin->w_cursor))
                        {
                            spos = &VIsual;
                            epos = &curwin->w_cursor;
                        }
                        else
                        {
                            spos = &curwin->w_cursor;
                            epos = &VIsual;
                        }
                    }

                    col = vcol2col(wp, lnum, col) - 1;

                    if (VIsual_active
                            && wp->w_buffer == curwin->w_buffer
                            && (lnum == spos->lnum
                                ? col >= (int)spos->col
                                : lnum > spos->lnum)
                            && (lnum == epos->lnum
                                ? col <= (int)epos->col
                                : lnum < epos->lnum))
                    {
                        /* Visual mode and pointing to the line with the
                         * Visual selection: return selected text, with a
                         * maximum of one line. */
                        if (spos->lnum != epos->lnum || spos->col == epos->col)
                            return FAIL;

                        lbuf = ml_get_buf(curwin->w_buffer, VIsual.lnum, FALSE);
                        lbuf = vim_strnsave(lbuf + spos->col,
                                     epos->col - spos->col + (*p_sel != 'e'));
                        lnum = spos->lnum;
                        col = spos->col;
                    }
                    else
                    {
                        /* Find the word under the cursor. */
                        ++emsg_off;
                        len = find_ident_at_pos(wp, lnum, (colnr_T)col, &lbuf,
                                        FIND_IDENT + FIND_STRING + FIND_EVAL);
                        --emsg_off;
                        if (len == 0)
                            return FAIL;
                        lbuf = vim_strnsave(lbuf, len);
                    }
                }

                *winp = wp;
                *lnump = lnum;
                *textp = lbuf;
                *colp = col;
                beval->ts = wp->w_buffer->b_p_ts;
                return OK;
            }
        }
    }

    return FAIL;
}

# if !defined(FEAT_GUI_W32) || defined(PROTO)

/*
 * Show a balloon with "mesg".
 */
    void
gui_mch_post_balloon(beval, mesg)
    BalloonEval *beval;
    char_u      *mesg;
{
    beval->msg = mesg;
    if (mesg != NULL)
        drawBalloon(beval);
    else
        undrawBalloon(beval);
}
# endif /* FEAT_GUI_W32 */
#endif /* FEAT_SUN_WORKSHOP || FEAT_NETBEANS_INTG || PROTO */

#if !defined(FEAT_GUI_W32) || defined(PROTO)
#if defined(FEAT_BEVAL_TIP) || defined(PROTO)
/*
 * Hide the given balloon.
 */
    void
gui_mch_unpost_balloon(beval)
    BalloonEval *beval;
{
    undrawBalloon(beval);
}
#endif

#ifdef FEAT_GUI_GTK
/*
 * We can unconditionally use ANSI-style prototypes here since
 * GTK+ requires an ANSI C compiler anyway.
 */
    static void
addEventHandler(GtkWidget *target, BalloonEval *beval)
{
    /*
     * Connect to the generic "event" signal instead of the individual
     * signals for each event type, because the former is emitted earlier.
     * This allows us to catch events independently of the signal handlers
     * in gui_gtk_x11.c.
     */
    /* Should use GTK_OBJECT() here, but that causes a lint warning... */
    gtk_signal_connect((GtkObject*)(target), "event",
                       GTK_SIGNAL_FUNC(target_event_cb),
                       beval);
    /*
     * Nasty:  Key press events go to the main window thus the drawing area
     * will never see them.  This means we have to connect to the main window
     * as well in order to catch those events.
     */
    if (gtk_socket_id == 0 && gui.mainwin != NULL
            && gtk_widget_is_ancestor(target, gui.mainwin))
    {
        gtk_signal_connect((GtkObject*)(gui.mainwin), "event",
                           GTK_SIGNAL_FUNC(mainwin_event_cb),
                           beval);
    }
}

    static void
removeEventHandler(BalloonEval *beval)
{
    /* LINTED: avoid warning: dubious operation on enum */
    gtk_signal_disconnect_by_func((GtkObject*)(beval->target),
                                  GTK_SIGNAL_FUNC(target_event_cb),
                                  beval);

    if (gtk_socket_id == 0 && gui.mainwin != NULL
            && gtk_widget_is_ancestor(beval->target, gui.mainwin))
    {
        /* LINTED: avoid warning: dubious operation on enum */
        gtk_signal_disconnect_by_func((GtkObject*)(gui.mainwin),
                                      GTK_SIGNAL_FUNC(mainwin_event_cb),
                                      beval);
    }
}

    static gint
target_event_cb(GtkWidget *widget, GdkEvent *event, gpointer data)
{
    BalloonEval *beval = (BalloonEval *)data;

    switch (event->type)
    {
        case GDK_ENTER_NOTIFY:
            pointer_event(beval, (int)event->crossing.x,
                                 (int)event->crossing.y,
                                 event->crossing.state);
            break;
        case GDK_MOTION_NOTIFY:
            if (event->motion.is_hint)
            {
                int             x;
                int             y;
                GdkModifierType state;
                /*
                 * GDK_POINTER_MOTION_HINT_MASK is set, thus we cannot obtain
                 * the coordinates from the GdkEventMotion struct directly.
                 */
                gdk_window_get_pointer(widget->window, &x, &y, &state);
                pointer_event(beval, x, y, (unsigned int)state);
            }
            else
            {
                pointer_event(beval, (int)event->motion.x,
                                     (int)event->motion.y,
                                     event->motion.state);
            }
            break;
        case GDK_LEAVE_NOTIFY:
            /*
             * Ignore LeaveNotify events that are not "normal".
             * Apparently we also get it when somebody else grabs focus.
             */
            if (event->crossing.mode == GDK_CROSSING_NORMAL)
                cancelBalloon(beval);
            break;
        case GDK_BUTTON_PRESS:
# ifdef HAVE_GTK2
        case GDK_SCROLL:
# endif
            cancelBalloon(beval);
            break;
        case GDK_KEY_PRESS:
            key_event(beval, event->key.keyval, TRUE);
            break;
        case GDK_KEY_RELEASE:
            key_event(beval, event->key.keyval, FALSE);
            break;
        default:
            break;
    }

    return FALSE; /* continue emission */
}

/*ARGSUSED*/
    static gint
mainwin_event_cb(GtkWidget *widget, GdkEvent *event, gpointer data)
{
    BalloonEval *beval = (BalloonEval *)data;

    switch (event->type)
    {
        case GDK_KEY_PRESS:
            key_event(beval, event->key.keyval, TRUE);
            break;
        case GDK_KEY_RELEASE:
            key_event(beval, event->key.keyval, FALSE);
            break;
        default:
            break;
    }

    return FALSE; /* continue emission */
}

    static void
pointer_event(BalloonEval *beval, int x, int y, unsigned state)
{
    int distance;

    distance = ABS(x - beval->x) + ABS(y - beval->y);

    if (distance > 4)
    {
        /*
         * Moved out of the balloon location: cancel it.
         * Remember button state
         */
        beval->state = state;
        cancelBalloon(beval);

        /* Mouse buttons are pressed - no balloon now */
        if (!(state & ((int)GDK_BUTTON1_MASK | (int)GDK_BUTTON2_MASK
                                                    | (int)GDK_BUTTON3_MASK)))
        {
            beval->x = x;
            beval->y = y;

            if (state & (int)GDK_MOD1_MASK)
            {
                /*
                 * Alt is pressed -- enter super-evaluate-mode,
                 * where there is no time delay
                 */
                if (beval->msgCB != NULL)
                {
                    beval->showState = ShS_PENDING;
                    (*beval->msgCB)(beval, state);
                }
            }
            else
            {
                beval->timerID = gtk_timeout_add((guint32)p_bdlay,
                                                 &timeout_cb, beval);
            }
        }
    }
}

    static void
key_event(BalloonEval *beval, unsigned keyval, int is_keypress)
{
    if (beval->showState == ShS_SHOWING && beval->msgCB != NULL)
    {
        switch (keyval)
        {
            case GDK_Shift_L:
            case GDK_Shift_R:
                beval->showState = ShS_UPDATE_PENDING;
                (*beval->msgCB)(beval, (is_keypress)
                                                   ? (int)GDK_SHIFT_MASK : 0);
                break;
            case GDK_Control_L:
            case GDK_Control_R:
                beval->showState = ShS_UPDATE_PENDING;
                (*beval->msgCB)(beval, (is_keypress)
                                                 ? (int)GDK_CONTROL_MASK : 0);
                break;
            default:
                /* Don't do this for key release, we apparently get these with
                 * focus changes in some GTK version. */
                if (is_keypress)
                    cancelBalloon(beval);
                break;
        }
    }
    else
        cancelBalloon(beval);
}

    static gint
timeout_cb(gpointer data)
{
    BalloonEval *beval = (BalloonEval *)data;

    beval->timerID = 0;
    /*
     * If the timer event happens then the mouse has stopped long enough for
     * a request to be started. The request will only send to the debugger if
     * there the mouse is pointing at real data.
     */
    requestBalloon(beval);

    return FALSE; /* don't call me again */
}

/*ARGSUSED2*/
    static gint
balloon_expose_event_cb(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
    gtk_paint_flat_box(widget->style, widget->window,
                       GTK_STATE_NORMAL, GTK_SHADOW_OUT,
                       &event->area, widget, "tooltip",
                       0, 0, -1, -1);

    return FALSE; /* continue emission */
}

# ifndef HAVE_GTK2
/*ARGSUSED2*/
    static void
balloon_draw_cb(GtkWidget *widget, GdkRectangle *area, gpointer data)
{
    GtkWidget       *child;
    GdkRectangle    child_area;

    gtk_paint_flat_box(widget->style, widget->window,
                       GTK_STATE_NORMAL, GTK_SHADOW_OUT,
                       area, widget, "tooltip",
                       0, 0, -1, -1);

    child = GTK_BIN(widget)->child;

    if (gtk_widget_intersect(child, area, &child_area))
        gtk_widget_draw(child, &child_area);
}
# endif

#else /* !FEAT_GUI_GTK */

    static void
addEventHandler(target, beval)
    Widget      target;
    BalloonEval *beval;
{
    XtAddEventHandler(target,
                        PointerMotionMask | EnterWindowMask |
                        LeaveWindowMask | ButtonPressMask | KeyPressMask |
                        KeyReleaseMask,
                        False,
                        pointerEventEH, (XtPointer)beval);
}

    static void
removeEventHandler(beval)
    BalloonEval *beval;
{
    XtRemoveEventHandler(beval->target,
                        PointerMotionMask | EnterWindowMask |
                        LeaveWindowMask | ButtonPressMask | KeyPressMask |
                        KeyReleaseMask,
                        False,
                        pointerEventEH, (XtPointer)beval);
}


/*
 * The X event handler. All it does is call the real event handler.
 */
/*ARGSUSED*/
    static void
pointerEventEH(w, client_data, event, unused)
    Widget      w;
    XtPointer   client_data;
    XEvent      *event;
    Boolean     *unused;
{
    BalloonEval *beval = (BalloonEval *)client_data;
    pointerEvent(beval, event);
}


/*
 * The real event handler. Called by pointerEventEH() whenever an event we are
 * interested in occurs.
 */

    static void
pointerEvent(beval, event)
    BalloonEval *beval;
    XEvent      *event;
{
    Position    distance;           /* a measure of how much the ponter moved */
    Position    delta;              /* used to compute distance */

    switch (event->type)
    {
        case EnterNotify:
        case MotionNotify:
            delta = event->xmotion.x - beval->x;
            if (delta < 0)
                delta = -delta;
            distance = delta;
            delta = event->xmotion.y - beval->y;
            if (delta < 0)
                delta = -delta;
            distance += delta;
            if (distance > 4)
            {
                /*
                 * Moved out of the balloon location: cancel it.
                 * Remember button state
                 */
                beval->state = event->xmotion.state;
                if (beval->state & (Button1Mask|Button2Mask|Button3Mask))
                {
                    /* Mouse buttons are pressed - no balloon now */
                    cancelBalloon(beval);
                }
                else if (beval->state & (Mod1Mask|Mod2Mask|Mod3Mask))
                {
                    /*
                     * Alt is pressed -- enter super-evaluate-mode,
                     * where there is no time delay
                     */
                    beval->x = event->xmotion.x;
                    beval->y = event->xmotion.y;
                    beval->x_root = event->xmotion.x_root;
                    beval->y_root = event->xmotion.y_root;
                    cancelBalloon(beval);
                    if (beval->msgCB != NULL)
                    {
                        beval->showState = ShS_PENDING;
                        (*beval->msgCB)(beval, beval->state);
                    }
                }
                else
                {
                    beval->x = event->xmotion.x;
                    beval->y = event->xmotion.y;
                    beval->x_root = event->xmotion.x_root;
                    beval->y_root = event->xmotion.y_root;
                    cancelBalloon(beval);
                    beval->timerID = XtAppAddTimeOut( beval->appContext,
                                        (long_u)p_bdlay, timerRoutine, beval);
                }
            }
            break;

        /*
         * Motif and Athena version: Keystrokes will be caught by the
         * "textArea" widget, and handled in gui_x11_key_hit_cb().
         */
        case KeyPress:
            if (beval->showState == ShS_SHOWING && beval->msgCB != NULL)
            {
                Modifiers   modifier;
                KeySym      keysym;

                XtTranslateKeycode(gui.dpy,
                                       event->xkey.keycode, event->xkey.state,
                                       &modifier, &keysym);
                if (keysym == XK_Shift_L || keysym == XK_Shift_R)
                {
                    beval->showState = ShS_UPDATE_PENDING;
                    (*beval->msgCB)(beval, ShiftMask);
                }
                else if (keysym == XK_Control_L || keysym == XK_Control_R)
                {
                    beval->showState = ShS_UPDATE_PENDING;
                    (*beval->msgCB)(beval, ControlMask);
                }
                else
                    cancelBalloon(beval);
            }
            else
                cancelBalloon(beval);
            break;

        case KeyRelease:
            if (beval->showState == ShS_SHOWING && beval->msgCB != NULL)
            {
                Modifiers modifier;
                KeySym keysym;

                XtTranslateKeycode(gui.dpy, event->xkey.keycode,
                                event->xkey.state, &modifier, &keysym);
                if ((keysym == XK_Shift_L) || (keysym == XK_Shift_R)) {
                    beval->showState = ShS_UPDATE_PENDING;
                    (*beval->msgCB)(beval, 0);
                }
                else if ((keysym == XK_Control_L) || (keysym == XK_Control_R))
                {
                    beval->showState = ShS_UPDATE_PENDING;
                    (*beval->msgCB)(beval, 0);
                }
                else
                    cancelBalloon(beval);
            }
            else
                cancelBalloon(beval);
            break;

        case LeaveNotify:
                /* Ignore LeaveNotify events that are not "normal".
                 * Apparently we also get it when somebody else grabs focus.
                 * Happens for me every two seconds (some clipboard tool?) */
                if (event->xcrossing.mode == NotifyNormal)
                    cancelBalloon(beval);
                break;

        case ButtonPress:
                cancelBalloon(beval);
                break;

        default:
            break;
    }
}

/*ARGSUSED*/
    static void
timerRoutine(dx, id)
    XtPointer       dx;
    XtIntervalId    *id;
{
    BalloonEval *beval = (BalloonEval *)dx;

    beval->timerID = (XtIntervalId)NULL;

    /*
     * If the timer event happens then the mouse has stopped long enough for
     * a request to be started. The request will only send to the debugger if
     * there the mouse is pointing at real data.
     */
    requestBalloon(beval);
}

#endif /* !FEAT_GUI_GTK */

    static void
requestBalloon(beval)
    BalloonEval *beval;
{
    if (beval->showState != ShS_PENDING)
    {
        /* Determine the beval to display */
        if (beval->msgCB != NULL)
        {
            beval->showState = ShS_PENDING;
            (*beval->msgCB)(beval, beval->state);
        }
        else if (beval->msg != NULL)
            drawBalloon(beval);
    }
}

#ifdef FEAT_GUI_GTK

# ifdef HAVE_GTK2
/*
 * Convert the string to UTF-8 if 'encoding' is not "utf-8".
 * Replace any non-printable characters and invalid bytes sequences with
 * "^X" or "<xx>" escapes, and apply SpecialKey highlighting to them.
 * TAB and NL are passed through unscathed.
 */
#  define IS_NONPRINTABLE(c) (((c) < 0x20 && (c) != TAB && (c) != NL) \
                              || (c) == DEL)
    static void
set_printable_label_text(GtkLabel *label, char_u *text)
{
    char_u          *convbuf = NULL;
    char_u          *buf;
    char_u          *p;
    char_u          *pdest;
    unsigned int    len;
    int             charlen;
    int             uc;
    PangoAttrList   *attr_list;

    /* Convert to UTF-8 if it isn't already */
    if (output_conv.vc_type != CONV_NONE)
    {
        convbuf = string_convert(&output_conv, text, NULL);
        if (convbuf != NULL)
            text = convbuf;
    }

    /* First let's see how much we need to allocate */
    len = 0;
    for (p = text; *p != NUL; p += charlen)
    {
        if ((*p & 0x80) == 0)   /* be quick for ASCII */
        {
            charlen = 1;
            len += IS_NONPRINTABLE(*p) ? 2 : 1; /* nonprintable: ^X */
        }
        else
        {
            charlen = utf_ptr2len(p);
            uc = utf_ptr2char(p);

            if (charlen != utf_char2len(uc))
                charlen = 1; /* reject overlong sequences */

            if (charlen == 1 || uc < 0xa0)      /* illegal byte or    */
                len += 4;                       /* control char: <xx> */
            else if (!utf_printable(uc))
                /* Note: we assume here that utf_printable() doesn't
                 * care about characters outside the BMP. */
                len += 6;                       /* nonprintable: <xxxx> */
            else
                len += charlen;
        }
    }

    attr_list = pango_attr_list_new();
    buf = alloc(len + 1);

    /* Now go for the real work */
    if (buf != NULL)
    {
        attrentry_T     *aep;
        PangoAttribute  *attr;
        guicolor_T      pixel;
        GdkColor        color = { 0, 0, 0, 0 };

        /* Look up the RGB values of the SpecialKey foreground color. */
        aep = syn_gui_attr2entry(hl_attr(HLF_8));
        pixel = (aep != NULL) ? aep->ae_u.gui.fg_color : INVALCOLOR;
        if (pixel != INVALCOLOR)
            gdk_colormap_query_color(gtk_widget_get_colormap(gui.drawarea),
                                     (unsigned long)pixel, &color);

        pdest = buf;
        p = text;
        while (*p != NUL)
        {
            /* Be quick for ASCII */
            if ((*p & 0x80) == 0 && !IS_NONPRINTABLE(*p))
            {
                *pdest++ = *p++;
            }
            else
            {
                charlen = utf_ptr2len(p);
                uc = utf_ptr2char(p);

                if (charlen != utf_char2len(uc))
                    charlen = 1; /* reject overlong sequences */

                if (charlen == 1 || uc < 0xa0 || !utf_printable(uc))
                {
                    int outlen;

                    /* Careful: we can't just use transchar_byte() here,
                     * since 'encoding' is not necessarily set to "utf-8". */
                    if (*p & 0x80 && charlen == 1)
                    {
                        transchar_hex(pdest, *p);       /* <xx> */
                        outlen = 4;
                    }
                    else if (uc >= 0x80)
                    {
                        /* Note: we assume here that utf_printable() doesn't
                         * care about characters outside the BMP. */
                        transchar_hex(pdest, uc);       /* <xx> or <xxxx> */
                        outlen = (uc < 0x100) ? 4 : 6;
                    }
                    else
                    {
                        transchar_nonprint(pdest, *p);  /* ^X */
                        outlen = 2;
                    }
                    if (pixel != INVALCOLOR)
                    {
                        attr = pango_attr_foreground_new(
                                color.red, color.green, color.blue);
                        attr->start_index = pdest - buf;
                        attr->end_index   = pdest - buf + outlen;
                        pango_attr_list_insert(attr_list, attr);
                    }
                    pdest += outlen;
                    p += charlen;
                }
                else
                {
                    do
                        *pdest++ = *p++;
                    while (--charlen != 0);
                }
            }
        }
        *pdest = NUL;
    }

    vim_free(convbuf);

    gtk_label_set_text(label, (const char *)buf);
    vim_free(buf);

    gtk_label_set_attributes(label, attr_list);
    pango_attr_list_unref(attr_list);
}
#  undef IS_NONPRINTABLE
# endif /* HAVE_GTK2 */

/*
 * Draw a balloon.
 */
    static void
drawBalloon(BalloonEval *beval)
{
    if (beval->msg != NULL)
    {
        GtkRequisition  requisition;
        int             screen_w;
        int             screen_h;
        int             x;
        int             y;
        int             x_offset = EVAL_OFFSET_X;
        int             y_offset = EVAL_OFFSET_Y;
# ifdef HAVE_GTK2
        PangoLayout     *layout;
# endif
# ifdef HAVE_GTK_MULTIHEAD
        GdkScreen       *screen;

        screen = gtk_widget_get_screen(beval->target);
        gtk_window_set_screen(GTK_WINDOW(beval->balloonShell), screen);
        screen_w = gdk_screen_get_width(screen);
        screen_h = gdk_screen_get_height(screen);
# else
        screen_w = gdk_screen_width();
        screen_h = gdk_screen_height();
# endif
        gtk_widget_ensure_style(beval->balloonShell);
        gtk_widget_ensure_style(beval->balloonLabel);

# ifdef HAVE_GTK2
        set_printable_label_text(GTK_LABEL(beval->balloonLabel), beval->msg);
        /*
         * Dirty trick:  Enable wrapping mode on the label's layout behind its
         * back.  This way GtkLabel won't try to constrain the wrap width to a
         * builtin maximum value of about 65 Latin characters.
         */
        layout = gtk_label_get_layout(GTK_LABEL(beval->balloonLabel));
#  ifdef PANGO_WRAP_WORD_CHAR
        pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
#  else
        pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
#  endif
        pango_layout_set_width(layout,
                /* try to come up with some reasonable width */
                PANGO_SCALE * CLAMP(gui.num_cols * gui.char_width,
                                    screen_w / 2,
                                    MAX(20, screen_w - 20)));

        /* Calculate the balloon's width and height. */
        gtk_widget_size_request(beval->balloonShell, &requisition);
# else
        gtk_label_set_line_wrap(GTK_LABEL(beval->balloonLabel), FALSE);
        gtk_label_set_text(GTK_LABEL(beval->balloonLabel),
                           (const char *)beval->msg);

        /* Calculate the balloon's width and height. */
        gtk_widget_size_request(beval->balloonShell, &requisition);
        /*
         * Unfortunately, the dirty trick used above to get around the builtin
         * maximum wrap width of GtkLabel doesn't work with GTK+ 1.  Thus if
         * and only if it's absolutely necessary to avoid drawing off-screen,
         * do enable wrapping now and recalculate the size request.
         */
        if (requisition.width > screen_w)
        {
            gtk_label_set_line_wrap(GTK_LABEL(beval->balloonLabel), TRUE);
            gtk_widget_size_request(beval->balloonShell, &requisition);
        }
# endif

        /* Compute position of the balloon area */
        gdk_window_get_origin(beval->target->window, &x, &y);
        x += beval->x;
        y += beval->y;

        /* Get out of the way of the mouse pointer */
        if (x + x_offset + requisition.width > screen_w)
            y_offset += 15;
        if (y + y_offset + requisition.height > screen_h)
            y_offset = -requisition.height - EVAL_OFFSET_Y;

        /* Sanitize values */
        x = CLAMP(x + x_offset, 0, MAX(0, screen_w - requisition.width));
        y = CLAMP(y + y_offset, 0, MAX(0, screen_h - requisition.height));

        /* Show the balloon */
        gtk_widget_set_uposition(beval->balloonShell, x, y);
        gtk_widget_show(beval->balloonShell);

        beval->showState = ShS_SHOWING;
    }
}

/*
 * Undraw a balloon.
 */
    static void
undrawBalloon(BalloonEval *beval)
{
    if (beval->balloonShell != NULL)
        gtk_widget_hide(beval->balloonShell);
    beval->showState = ShS_NEUTRAL;
}

    static void
cancelBalloon(BalloonEval *beval)
{
    if (beval->showState == ShS_SHOWING
            || beval->showState == ShS_UPDATE_PENDING)
        undrawBalloon(beval);

    if (beval->timerID != 0)
    {
        gtk_timeout_remove(beval->timerID);
        beval->timerID = 0;
    }
    beval->showState = ShS_NEUTRAL;
}

    static void
createBalloonEvalWindow(BalloonEval *beval)
{
    beval->balloonShell = gtk_window_new(GTK_WINDOW_POPUP);

    gtk_widget_set_app_paintable(beval->balloonShell, TRUE);
    gtk_window_set_policy(GTK_WINDOW(beval->balloonShell), FALSE, FALSE, TRUE);
    gtk_widget_set_name(beval->balloonShell, "gtk-tooltips");
    gtk_container_border_width(GTK_CONTAINER(beval->balloonShell), 4);

    gtk_signal_connect((GtkObject*)(beval->balloonShell), "expose_event",
                       GTK_SIGNAL_FUNC(balloon_expose_event_cb), NULL);
# ifndef HAVE_GTK2
    gtk_signal_connect((GtkObject*)(beval->balloonShell), "draw",
                       GTK_SIGNAL_FUNC(balloon_draw_cb), NULL);
# endif
    beval->balloonLabel = gtk_label_new(NULL);

    gtk_label_set_line_wrap(GTK_LABEL(beval->balloonLabel), FALSE);
    gtk_label_set_justify(GTK_LABEL(beval->balloonLabel), GTK_JUSTIFY_LEFT);
    gtk_misc_set_alignment(GTK_MISC(beval->balloonLabel), 0.5f, 0.5f);
    gtk_widget_set_name(beval->balloonLabel, "vim-balloon-label");
    gtk_widget_show(beval->balloonLabel);

    gtk_container_add(GTK_CONTAINER(beval->balloonShell), beval->balloonLabel);
}

#else /* !FEAT_GUI_GTK */

/*
 * Draw a balloon.
 */
    static void
drawBalloon(beval)
    BalloonEval *beval;
{
    Dimension   w;
    Dimension   h;
    Position tx;
    Position ty;

    if (beval->msg != NULL)
    {
        /* Show the Balloon */

        /* Calculate the label's width and height */
#ifdef FEAT_GUI_MOTIF
        XmString s;

        /* For the callback function we parse NL characters to create a
         * multi-line label.  This doesn't work for all languages, but
         * XmStringCreateLocalized() doesn't do multi-line labels... */
        if (beval->msgCB != NULL)
            s = XmStringCreateLtoR((char *)beval->msg, XmFONTLIST_DEFAULT_TAG);
        else
            s = XmStringCreateLocalized((char *)beval->msg);
        {
            XmFontList fl;

            fl = gui_motif_fontset2fontlist(&gui.tooltip_fontset);
            if (fl != NULL)
            {
                XmStringExtent(fl, s, &w, &h);
                XmFontListFree(fl);
            }
        }
        w += gui.border_offset << 1;
        h += gui.border_offset << 1;
        XtVaSetValues(beval->balloonLabel, XmNlabelString, s, NULL);
        XmStringFree(s);
#else /* Athena */
        /* Assume XtNinternational == True */
        XFontSet        fset;
        XFontSetExtents *ext;

        XtVaGetValues(beval->balloonLabel, XtNfontSet, &fset, NULL);
        ext = XExtentsOfFontSet(fset);
        h = ext->max_ink_extent.height;
        w = XmbTextEscapement(fset,
                              (char *)beval->msg,
                              (int)STRLEN(beval->msg));
        w += gui.border_offset << 1;
        h += gui.border_offset << 1;
        XtVaSetValues(beval->balloonLabel, XtNlabel, beval->msg, NULL);
#endif

        /* Compute position of the balloon area */
        tx = beval->x_root + EVAL_OFFSET_X;
        ty = beval->y_root + EVAL_OFFSET_Y;
        if ((tx + w) > beval->screen_width)
            tx = beval->screen_width - w;
        if ((ty + h) > beval->screen_height)
            ty = beval->screen_height - h;
#ifdef FEAT_GUI_MOTIF
        XtVaSetValues(beval->balloonShell,
                XmNx, tx,
                XmNy, ty,
                NULL);
#else
        /* Athena */
        XtVaSetValues(beval->balloonShell,
                XtNx, tx,
                XtNy, ty,
                NULL);
#endif

        XtPopup(beval->balloonShell, XtGrabNone);

        beval->showState = ShS_SHOWING;

        current_beval = beval;
    }
}

/*
 * Undraw a balloon.
 */
    static void
undrawBalloon(beval)
    BalloonEval *beval;
{
    if (beval->balloonShell != (Widget)0)
        XtPopdown(beval->balloonShell);
    beval->showState = ShS_NEUTRAL;

    current_beval = NULL;
}

    static void
cancelBalloon(beval)
    BalloonEval *beval;
{
    if (beval->showState == ShS_SHOWING
            || beval->showState == ShS_UPDATE_PENDING)
        undrawBalloon(beval);

    if (beval->timerID != (XtIntervalId)NULL)
    {
        XtRemoveTimeOut(beval->timerID);
        beval->timerID = (XtIntervalId)NULL;
    }
    beval->showState = ShS_NEUTRAL;
}


    static void
createBalloonEvalWindow(beval)
    BalloonEval *beval;
{
    Arg         args[12];
    int         n;

    n = 0;
#ifdef FEAT_GUI_MOTIF
    XtSetArg(args[n], XmNallowShellResize, True); n++;
    beval->balloonShell = XtAppCreateShell("balloonEval", "BalloonEval",
                    overrideShellWidgetClass, gui.dpy, args, n);
#else
    /* Athena */
    XtSetArg(args[n], XtNallowShellResize, True); n++;
    beval->balloonShell = XtAppCreateShell("balloonEval", "BalloonEval",
                    overrideShellWidgetClass, gui.dpy, args, n);
#endif

    n = 0;
#ifdef FEAT_GUI_MOTIF
    {
        XmFontList fl;

        fl = gui_motif_fontset2fontlist(&gui.tooltip_fontset);
        XtSetArg(args[n], XmNforeground, gui.tooltip_fg_pixel); n++;
        XtSetArg(args[n], XmNbackground, gui.tooltip_bg_pixel); n++;
        XtSetArg(args[n], XmNfontList, fl); n++;
        XtSetArg(args[n], XmNalignment, XmALIGNMENT_BEGINNING); n++;
        beval->balloonLabel = XtCreateManagedWidget("balloonLabel",
                        xmLabelWidgetClass, beval->balloonShell, args, n);
    }
#else /* FEAT_GUI_ATHENA */
    XtSetArg(args[n], XtNforeground, gui.tooltip_fg_pixel); n++;
    XtSetArg(args[n], XtNbackground, gui.tooltip_bg_pixel); n++;
    XtSetArg(args[n], XtNinternational, True); n++;
    XtSetArg(args[n], XtNfontSet, gui.tooltip_fontset); n++;
    beval->balloonLabel = XtCreateManagedWidget("balloonLabel",
                    labelWidgetClass, beval->balloonShell, args, n);
#endif
}

#endif /* !FEAT_GUI_GTK */
#endif /* !FEAT_GUI_W32 */

#endif /* FEAT_BEVAL */