path: root/src/events.c

/*****************************************************************************/
/*

Copyright 1989, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

*/
/**       Copyright 1988 by Evans & Sutherland Computer Corporation,        **/
/**                          Salt Lake City, Utah                           **/
/**                        Cambridge, Massachusetts                         **/
/**                                                                         **/
/**                           All Rights Reserved                           **/
/**                                                                         **/
/**    Permission to use, copy, modify, and distribute this software and    **/
/**    its documentation  for  any  purpose  and  without  fee is hereby    **/
/**    granted, provided that the above copyright notice appear  in  all    **/
/**    copies and that both  that  copyright  notice  and  this  permis-    **/
/**    sion  notice appear in supporting  documentation,  and  that  the    **/
/**    name of Evans & Sutherland not be used in advertising    **/
/**    in publicity pertaining to distribution of the  software  without    **/
/**    specific, written prior permission.                                  **/
/**                                                                         **/
/**    EVANS & SUTHERLAND DISCLAIMs ALL WARRANTIES WITH REGARD    **/
/**    TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES  OF  MERCHANT-    **/
/**    ABILITY  AND  FITNESS,  IN  NO  EVENT SHALL EVANS & SUTHERLAND    **/
/**    BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL  DAM-    **/
/**    AGES OR  ANY DAMAGES WHATSOEVER  RESULTING FROM LOSS OF USE, DATA    **/
/**    OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER    **/
/**    TORTIOUS ACTION, ARISING OUT OF OR IN  CONNECTION  WITH  THE  USE    **/
/**    OR PERFORMANCE OF THIS SOFTWARE.                                     **/
/*****************************************************************************/

/***********************************************************************
 *
 * twm event handling
 *
 * 17-Nov-87 Thomas E. LaStrange                File created
 *
 ***********************************************************************/

#include <stdio.h>
#include "twm.h"
#include <X11/Xatom.h>
#include "iconmgr.h"
#include "add_window.h"
#include "menus.h"
#include "events.h"
#include "resize.h"
#include "parse.h"
#include "gram.h"
#include "util.h"
#include "screen.h"
#include "icons.h"
#include "version.h"

#ifdef HAVE_XRANDR
#include <X11/extensions/Xrandr.h>
#endif

#define MAX_X_EVENT 256
event_proc EventHandler[MAX_X_EVENT];   /* event handler jump table */
static const char *Action;
int Context = C_NO_CONTEXT;     /* current button press context */
static TwmWindow *ButtonWindow; /* button press window structure */
static XEvent ButtonEvent;      /* button press event */
XEvent Event;                   /* the current event */
static TwmWindow *Tmp_win;      /* the current twm window */

/** Used in HandleEnterNotify to remove border highlight from a window
 * that has not received a LeaveNotify event because of a pointer grab
 */
static TwmWindow *UnHighLight_win = NULL;

Window DragWindow;              /* variables used in moving windows */
int origDragX;
int origDragY;
int DragX;
int DragY;
int DragWidth;
int DragHeight;
int CurrentDragX;
int CurrentDragY;

static int enter_flag;
static int ColortableThrashing;
static TwmWindow *enter_win, *raise_win;

static void free_window_names(TwmWindow *tmp, Bool nukefull, Bool nukename,
                              Bool nukeicon);
static void remove_window_from_ring(TwmWindow *tmp);
static void do_menu(MenuRoot *menu, Window w);
static Bool HENQueueScanner(Display *dpy, XEvent *ev, char *args);
static Bool HLNQueueScanner(Display *dpy, XEvent *ev, char *args);
static void flush_expose(Window w);
static Bool UninstallRootColormapQScanner(Display *dpy, XEvent *ev, char *args);
static void RedoIconName(void);

int ButtonPressed = -1;
int Cancel = FALSE;

void
AutoRaiseWindow(TwmWindow *tmp)
{
    XRaiseWindow(dpy, tmp->frame);
    XSync(dpy, 0);
    enter_win = NULL;
    enter_flag = TRUE;
    raise_win = tmp;
}

void
SetRaiseWindow(TwmWindow *tmp)
{
    enter_flag = TRUE;
    enter_win = NULL;
    raise_win = tmp;
    XSync(dpy, 0);
}

/**
 * initialize the event jump table.
 */
void
InitEvents(void)
{
    int i;

    ResizeWindow = (Window) 0;
    DragWindow = (Window) 0;
    enter_flag = FALSE;
    enter_win = raise_win = NULL;

    for (i = 0; i < MAX_X_EVENT; i++)
        EventHandler[i] = HandleUnknown;

    EventHandler[Expose] = HandleExpose;
    EventHandler[CreateNotify] = HandleCreateNotify;
    EventHandler[DestroyNotify] = HandleDestroyNotify;
    EventHandler[MapRequest] = HandleMapRequest;
    EventHandler[MapNotify] = HandleMapNotify;
    EventHandler[UnmapNotify] = HandleUnmapNotify;
    EventHandler[MotionNotify] = HandleMotionNotify;
    EventHandler[ButtonRelease] = HandleButtonRelease;
    EventHandler[ButtonPress] = HandleButtonPress;
    EventHandler[EnterNotify] = HandleEnterNotify;
    EventHandler[LeaveNotify] = HandleLeaveNotify;
    EventHandler[ConfigureRequest] = HandleConfigureRequest;
    EventHandler[ClientMessage] = HandleClientMessage;
    EventHandler[PropertyNotify] = HandlePropertyNotify;
    EventHandler[KeyPress] = HandleKeyPress;
    EventHandler[ColormapNotify] = HandleColormapNotify;
    EventHandler[VisibilityNotify] = HandleVisibilityNotify;
    if (HasShape)
        EventHandler[ShapeEventBase + ShapeNotify] = HandleShapeNotify;
#ifdef HAVE_XRANDR
    if (HasXrandr) {
        int scrnum;

        EventHandler[XrandrEventBase + RRScreenChangeNotify] =
            HandleScreenChangeNotify;
        for (scrnum = 0; scrnum < NumScreens; scrnum++) {
            XRRSelectInput(dpy, ScreenList[scrnum]->Root,
                           RRScreenChangeNotifyMask);
        }
    }
#endif
}

Time lastTimestamp = CurrentTime;       /* until Xlib does this for us */

Bool
StashEventTime(XEvent *ev)
{
    switch (ev->type) {
    case KeyPress:
    case KeyRelease:
        lastTimestamp = ev->xkey.time;
        return True;
    case ButtonPress:
    case ButtonRelease:
        lastTimestamp = ev->xbutton.time;
        return True;
    case MotionNotify:
        lastTimestamp = ev->xmotion.time;
        return True;
    case EnterNotify:
    case LeaveNotify:
        lastTimestamp = ev->xcrossing.time;
        return True;
    case PropertyNotify:
        lastTimestamp = ev->xproperty.time;
        return True;
    case SelectionClear:
        lastTimestamp = ev->xselectionclear.time;
        return True;
    case SelectionRequest:
        lastTimestamp = ev->xselectionrequest.time;
        return True;
    case SelectionNotify:
        lastTimestamp = ev->xselection.time;
        return True;
    }
    return False;
}

/**
 * return the window about which this event is concerned; this
 * window may not be the same as XEvent.xany.window (the first window listed
 * in the structure).
 */
Window
WindowOfEvent(XEvent *e)
{
    /*
     * Each window subfield is marked with whether or not it is the same as
     * XEvent.xany.window or is different (which is the case for some of the
     * notify events).
     */
    /* *INDENT-OFF* */
    switch (e->type) {
      case KeyPress:
      case KeyRelease:        return e->xkey.window;                 /* same */
      case ButtonPress:
      case ButtonRelease:     return e->xbutton.window;              /* same */
      case MotionNotify:      return e->xmotion.window;              /* same */
      case EnterNotify:
      case LeaveNotify:       return e->xcrossing.window;            /* same */
      case FocusIn:
      case FocusOut:          return e->xfocus.window;               /* same */
      case KeymapNotify:      return e->xkeymap.window;              /* same */
      case Expose:            return e->xexpose.window;              /* same */
      case GraphicsExpose:    return e->xgraphicsexpose.drawable;    /* same */
      case NoExpose:          return e->xnoexpose.drawable;          /* same */
      case VisibilityNotify:  return e->xvisibility.window;          /* same */
      case CreateNotify:      return e->xcreatewindow.window;        /* DIFF */
      case DestroyNotify:     return e->xdestroywindow.window;       /* DIFF */
      case UnmapNotify:       return e->xunmap.window;               /* DIFF */
      case MapNotify:         return e->xmap.window;                 /* DIFF */
      case MapRequest:        return e->xmaprequest.window;          /* DIFF */
      case ReparentNotify:    return e->xreparent.window;            /* DIFF */
      case ConfigureNotify:   return e->xconfigure.window;           /* DIFF */
      case ConfigureRequest:  return e->xconfigurerequest.window;    /* DIFF */
      case GravityNotify:     return e->xgravity.window;             /* DIFF */
      case ResizeRequest:     return e->xresizerequest.window;       /* same */
      case CirculateNotify:   return e->xcirculate.window;           /* DIFF */
      case CirculateRequest:  return e->xcirculaterequest.window;    /* DIFF */
      case PropertyNotify:    return e->xproperty.window;            /* same */
      case SelectionClear:    return e->xselectionclear.window;      /* same */
      case SelectionRequest:  return e->xselectionrequest.requestor; /* DIFF */
      case SelectionNotify:   return e->xselection.requestor;        /* same */
      case ColormapNotify:    return e->xcolormap.window;            /* same */
      case ClientMessage:     return e->xclient.window;              /* same */
      case MappingNotify:     return None;
    }
    /* *INDENT-ON* */
    return None;
}

/**
 *      handle a single X event stored in global var Event
 * this routine for is for a call during an f.move
 */
Bool
DispatchEvent2(void)
{
    Window w = Event.xany.window;
    XPointer context_data;
    StashEventTime(&Event);

    if (XFindContext(dpy, w, TwmContext, &context_data) == 0)
        Tmp_win = (TwmWindow *) context_data;
    else
        Tmp_win = NULL;

    if (XFindContext(dpy, w, ScreenContext, &context_data) == 0)
        Scr = (struct ScreenInfo *) context_data;
    else
        Scr = FindScreenInfo(WindowOfEvent(&Event));

    if (!Scr)
        return False;

    if (menuFromFrameOrWindowOrTitlebar && Event.type == Expose)
        HandleExpose();

    if (!menuFromFrameOrWindowOrTitlebar && Event.type >= 0 &&
        Event.type < MAX_X_EVENT) {
        (*EventHandler[Event.type]) ();
    }

    return True;
}

/**
 * handle a single X event stored in global var Event
 */
Bool
DispatchEvent(void)
{
    Window w = Event.xany.window;
    XPointer context_data;
    StashEventTime(&Event);

    if (XFindContext(dpy, w, TwmContext, &context_data) == 0)
        Tmp_win = (TwmWindow *) context_data;
    else
        Tmp_win = NULL;

    if (XFindContext(dpy, w, ScreenContext, &context_data) == 0)
        Scr = (struct ScreenInfo *) context_data;
    else
        Scr = FindScreenInfo(WindowOfEvent(&Event));

    if (!Scr)
        return False;

    if (Event.type >= 0 && Event.type < MAX_X_EVENT) {
        (*EventHandler[Event.type]) ();
    }

    return True;
}

/**
 * handle X events
 */
void
HandleEvents(XtAppContext appContext)
{
    while (TRUE) {
        if (enter_flag && !QLength(dpy)) {
            if (enter_win && enter_win != raise_win) {
                AutoRaiseWindow(enter_win);     /* sets enter_flag T */
            }
            else {
                enter_flag = FALSE;
            }
        }
        if (ColortableThrashing && !QLength(dpy) && Scr) {
            InstallWindowColormaps(ColormapNotify, (TwmWindow *) NULL);
        }
        WindowMoved = FALSE;
        XtAppNextEvent(appContext, &Event);

        if (Event.type >= 0 && Event.type < MAX_X_EVENT)
            (void) DispatchEvent();
        else
            XtDispatchEvent(&Event);
    }
}

/**
 * colormap notify event handler.
 *
 * This procedure handles both a client changing its own colormap, and
 * a client explicitly installing its colormap itself (only the window
 * manager should do that, so we must set it correctly).
 *
 */
void
HandleColormapNotify(void)
{
    XColormapEvent *cevent = (XColormapEvent *) &Event;
    ColormapWindow *cwin;
    TwmColormap *cmap;
    XPointer context_data;

    if (XFindContext(dpy, cevent->window, ColormapContext, &context_data) == 0)
        cwin = (ColormapWindow *) context_data;
    else
        return;

    cmap = cwin->colormap;

    if (cevent->new) {
        if (XFindContext(dpy, cevent->colormap, ColormapContext,
                         &context_data) == XCNOENT)
            cwin->colormap = CreateTwmColormap(cevent->colormap);
        else {
            cwin->colormap = (TwmColormap *) context_data;
            cwin->colormap->refcnt++;
        }

        cmap->refcnt--;

        if (cevent->state == ColormapUninstalled)
            cmap->state &= ~CM_INSTALLED;
        else
            cmap->state |= CM_INSTALLED;

        if (cmap->state & CM_INSTALLABLE)
            InstallWindowColormaps(ColormapNotify, (TwmWindow *) NULL);

        if (cmap->refcnt == 0) {
            XDeleteContext(dpy, cmap->c, ColormapContext);
            free(cmap);
        }

        return;
    }

    if (cevent->state == ColormapUninstalled && (cmap->state & CM_INSTALLABLE)) {
        if (!(cmap->state & CM_INSTALLED))
            return;
        cmap->state &= ~CM_INSTALLED;

        if (!ColortableThrashing) {
            ColortableThrashing = TRUE;
            XSync(dpy, 0);
        }

        if (cevent->serial >= Scr->cmapInfo.first_req) {
            ColormapWindow **cwins;
            int lost, won, n, number_cwins;

            number_cwins = Scr->cmapInfo.cmaps->number_cwins;

            /*
             * Find out which colortables collided.
             */

            cwins = Scr->cmapInfo.cmaps->cwins;
            for (lost = won = -1, n = 0;
                 (lost == -1 || won == -1) && n < number_cwins; n++) {
                if (lost == -1 && cwins[n] == cwin) {
                    lost = n;   /* This is the window which lost its colormap */
                    continue;
                }

                if (won == -1 &&
                    cwins[n]->colormap->install_req == cevent->serial) {
                    won = n;    /* This is the window whose colormap caused */
                    continue;   /* the de-install of the previous colormap */
                }
            }

            /*
             ** Cases are:
             ** Both the request and the window were found:
             **         One of the installs made honoring the WM_COLORMAP
             **         property caused another of the colormaps to be
             **         de-installed, just mark the scoreboard.
             **
             ** Only the request was found:
             **         One of the installs made honoring the WM_COLORMAP
             **         property caused a window not in the WM_COLORMAP
             **         list to lose its map.  This happens when the map
             **         it is losing is one which is trying to be installed,
             **         but is getting getting de-installed by another map
             **         in this case, we'll get a scoreable event later,
             **         this one is meaningless.
             **
             ** Neither the request nor the window was found:
             **         Somebody called installcolormap, but it doesn't
             **         affect the WM_COLORMAP windows.  This case will
             **         probably never occur.
             **
             ** Only the window was found:
             **         One of the WM_COLORMAP windows lost its colormap
             **         but it wasn't one of the requests known.  This is
             **         probably because someone did an "InstallColormap".
             **         The colormap policy is "enforced" by re-installing
             **         the colormaps which are believed to be correct.
             */

            if (won != -1) {
                if (lost != -1) {
                    /* lower diagonal index calculation */
                    if (lost > won)
                        n = lost * (lost - 1) / 2 + won;
                    else
                        n = won * (won - 1) / 2 + lost;
                    Scr->cmapInfo.cmaps->scoreboard[n] = 1;
                }
                else {
                    /*
                     ** One of the cwin installs caused one of the cwin
                     ** colormaps to be de-installed, so I'm sure to get an
                     ** UninstallNotify for the cwin I know about later.
                     ** I haven't got it yet, or the test of CM_INSTALLED
                     ** above would have failed.  Turning the CM_INSTALLED
                     ** bit back on makes sure we get back here to score
                     ** the collision.
                     */
                    cmap->state |= CM_INSTALLED;
                }
            }
            else if (lost != -1) {
                InstallWindowColormaps(ColormapNotify, (TwmWindow *) NULL);
            }
        }
    }

    else if (cevent->state == ColormapUninstalled)
        cmap->state &= ~CM_INSTALLED;

    else if (cevent->state == ColormapInstalled)
        cmap->state |= CM_INSTALLED;
}

/**
 * visibility notify event handler.
 *
 * This routine keeps track of visibility events so that colormap
 * installation can keep the maximum number of useful colormaps
 * installed at one time.
 *
 */
void
HandleVisibilityNotify(void)
{
    XVisibilityEvent *vevent = (XVisibilityEvent *) &Event;
    ColormapWindow *cwin;
    TwmColormap *cmap;
    XPointer context_data;

    if (XFindContext(dpy, vevent->window, ColormapContext, &context_data) == 0)
        cwin = (ColormapWindow *) context_data;
    else
        return;

    /*
     * when Saber complains about retrieving an <int> from an <unsigned int>
     * just type "touch vevent->state" and "cont"
     */
    cmap = cwin->colormap;
    if ((cmap->state & CM_INSTALLABLE) &&
        vevent->state != cwin->visibility &&
        (vevent->state == VisibilityFullyObscured ||
         cwin->visibility == VisibilityFullyObscured) && cmap->w == cwin->w) {
        cwin->visibility = vevent->state;
        InstallWindowColormaps(VisibilityNotify, (TwmWindow *) NULL);
    }
    else
        cwin->visibility = vevent->state;
}

int MovedFromKeyPress = False;

/**
 * key press event handler
 */
void
HandleKeyPress(void)
{
    KeySym ks;
    FuncKey *key;
    int len;
    unsigned int modifier;

    if (InfoLines)
        XUnmapWindow(dpy, Scr->InfoWindow);
    Context = C_NO_CONTEXT;

    if (Event.xany.window == Scr->Root)
        Context = C_ROOT;
    if (Tmp_win) {
        if (Event.xany.window == Tmp_win->title_w)
            Context = C_TITLE;
        if (Event.xany.window == Tmp_win->w)
            Context = C_WINDOW;
        if (Event.xany.window == Tmp_win->icon_w)
            Context = C_ICON;
        if (Event.xany.window == Tmp_win->frame)
            Context = C_FRAME;
        if (Tmp_win->list && Event.xany.window == Tmp_win->list->w)
            Context = C_ICONMGR;
        if (Tmp_win->list && Event.xany.window == Tmp_win->list->icon)
            Context = C_ICONMGR;
    }

    modifier = (Event.xkey.state & mods_used);
    ks = XLookupKeysym((XKeyEvent *) &Event, /* KeySyms index */ 0);

    for (key = Scr->FuncKeyRoot.next; key != NULL; key = key->next) {
        if (key->keysym == ks &&
            (unsigned) key->mods == modifier &&
            (key->cont == Context || key->cont == C_NAME)) {
            /* weed out the functions that don't make sense to execute
             * from a key press
             */
            if (key->func == F_RESIZE)
                return;
            /* special case for F_MOVE/F_FORCEMOVE activated from a keypress */
            if (key->func == F_MOVE || key->func == F_FORCEMOVE)
                MovedFromKeyPress = True;

            if (key->cont != C_NAME) {
                ExecuteFunction(key->func, key->action, Event.xany.window,
                                Tmp_win, &Event, Context, FALSE);
                XUngrabPointer(dpy, CurrentTime);
                return;
            }
            else {
                int matched = FALSE;

                len = (int) strlen(key->win_name);

                /* try and match the name first */
                for (Tmp_win = Scr->TwmRoot.next; Tmp_win != NULL;
                     Tmp_win = Tmp_win->next) {
                    if (!strncmp(key->win_name, Tmp_win->name, (size_t) len)) {
                        matched = TRUE;
                        ExecuteFunction(key->func, key->action, Tmp_win->frame,
                                        Tmp_win, &Event, C_FRAME, FALSE);
                        XUngrabPointer(dpy, CurrentTime);
                    }
                }

                /* now try the res_name */
                if (!matched)
                    for (Tmp_win = Scr->TwmRoot.next; Tmp_win != NULL;
                         Tmp_win = Tmp_win->next) {
                        if (!strncmp
                            (key->win_name, Tmp_win->class.res_name,
                             (size_t) len)) {
                            matched = TRUE;
                            ExecuteFunction(key->func, key->action,
                                            Tmp_win->frame, Tmp_win, &Event,
                                            C_FRAME, FALSE);
                            XUngrabPointer(dpy, CurrentTime);
                        }
                    }

                /* now try the res_class */
                if (!matched)
                    for (Tmp_win = Scr->TwmRoot.next; Tmp_win != NULL;
                         Tmp_win = Tmp_win->next) {
                        if (!strncmp
                            (key->win_name, Tmp_win->class.res_class,
                             (size_t) len)) {
                            matched = TRUE;
                            ExecuteFunction(key->func, key->action,
                                            Tmp_win->frame, Tmp_win, &Event,
                                            C_FRAME, FALSE);
                            XUngrabPointer(dpy, CurrentTime);
                        }
                    }
                if (matched)
                    return;
            }
        }
    }

    /* if we get here, no function key was bound to the key.  Send it
     * to the client if it was in a window we know about.
     */
    if (Tmp_win) {
        if (Event.xany.window == Tmp_win->icon_w ||
            Event.xany.window == Tmp_win->frame ||
            Event.xany.window == Tmp_win->title_w ||
            (Tmp_win->list && (Event.xany.window == Tmp_win->list->w))) {
            Event.xkey.window = Tmp_win->w;
            XSendEvent(dpy, Tmp_win->w, False, KeyPressMask, &Event);
        }
    }

}

static void
free_window_names(TwmWindow *tmp, Bool nukefull, Bool nukename, Bool nukeicon)
{
/*
 * XXX - are we sure that nobody ever sets these to another constant (check
 * twm windows)?
 */
    if (tmp->name == tmp->full_name)
        nukefull = False;
    if (tmp->icon_name == tmp->name)
        nukename = False;

    if (nukefull && tmp->full_name)
        free(tmp->full_name);
    if (nukename && tmp->name)
        free(tmp->name);
    if (nukeicon && tmp->icon_name)
        free(tmp->icon_name);
    return;
}

void
free_cwins(TwmWindow *tmp)
{
    if (tmp->cmaps.number_cwins) {
        int i;

        for (i = 0; i < tmp->cmaps.number_cwins; i++) {

            if (--tmp->cmaps.cwins[i]->refcnt == 0) {
                TwmColormap *cmap = tmp->cmaps.cwins[i]->colormap;

                if (--cmap->refcnt == 0) {
                    XDeleteContext(dpy, cmap->c, ColormapContext);
                    free(cmap);
                }
                XDeleteContext(dpy, tmp->cmaps.cwins[i]->w, ColormapContext);
                free(tmp->cmaps.cwins[i]);
            }
        }
        free(tmp->cmaps.cwins);

        if (tmp->cmaps.number_cwins > 1) {
            free(tmp->cmaps.scoreboard);
            tmp->cmaps.scoreboard = NULL;
        }
        tmp->cmaps.number_cwins = 0;
    }
}

/**
 * property notify event handler
 */
void
HandlePropertyNotify(void)
{
    char *name = NULL;
    XSetWindowAttributes attributes;    /* attributes for create windows */
    Pixmap pm;
    int dummy = 0;
    unsigned udummy = 0;
    Window wdummy = None;

    /* watch for standard colormap changes */
    if (Event.xproperty.window == Scr->Root) {
        XStandardColormap *maps = NULL;
        int nmaps;

        switch (Event.xproperty.state) {
        case PropertyNewValue:
            if (XGetRGBColormaps(dpy, Scr->Root, &maps, &nmaps,
                                 Event.xproperty.atom)) {
                /* if got one, then replace any existing entry */
                InsertRGBColormap(Event.xproperty.atom, maps, nmaps, True);
            }
            return;

        case PropertyDelete:
            RemoveRGBColormap(Event.xproperty.atom);

            return;
        }
    }

    if (!Tmp_win)
        return;                 /* unknown window */

#define MAX_NAME_LEN 200L       /* truncate to this many */
#define MAX_ICON_NAME_LEN 200L  /* ditto */

    switch (Event.xproperty.atom) {
    case XA_WM_NAME:
        if (!I18N_FetchName(dpy, Tmp_win->w, &name))
            return;
        free_window_names(Tmp_win, True, True, False);

        Tmp_win->full_name = strdup(name ? name : NoName);
        Tmp_win->name = strdup(name ? name : NoName);
        if (name)
            free(name);

        Tmp_win->nameChanged = 1;

        Tmp_win->name_width = MyFont_TextWidth(&Scr->TitleBarFont,
                                               Tmp_win->name,
                                               (int) strlen(Tmp_win->name));

        SetupWindow(Tmp_win, Tmp_win->frame_x, Tmp_win->frame_y,
                    Tmp_win->frame_width, Tmp_win->frame_height, -1);

        if (Tmp_win->title_w)
            XClearArea(dpy, Tmp_win->title_w, 0, 0, 0, 0, True);

        /*
         * if the icon name is NoName, set the name of the icon to be
         * the same as the window
         */
        if (Tmp_win->icon_name == NoName) {
            Tmp_win->icon_name = Tmp_win->name;
            RedoIconName();
        }
        break;

    case XA_WM_ICON_NAME:
        if (!I18N_GetIconName(dpy, Tmp_win->w, &name))
            return;
        free_window_names(Tmp_win, False, False, True);
        Tmp_win->icon_name = strdup(name ? name : NoName);
        if (name)
            free(name);

        RedoIconName();
        break;

    case XA_WM_HINTS:
        if (Tmp_win->wmhints)
            XFree(Tmp_win->wmhints);
        Tmp_win->wmhints = XGetWMHints(dpy, Event.xany.window);

        if (Tmp_win->wmhints && (Tmp_win->wmhints->flags & WindowGroupHint))
            Tmp_win->group = Tmp_win->wmhints->window_group;

        if (Tmp_win->icon_not_ours && Tmp_win->wmhints &&
            !(Tmp_win->wmhints->flags & IconWindowHint)) {
            /* IconWindowHint was formerly on, now off; revert
               // to a default icon */
            int icon_x = 0, icon_y = 0;

            XGetGeometry(dpy, Tmp_win->icon_w, &wdummy,
                         &icon_x, &icon_y,
                         &udummy, &udummy, &udummy, &udummy);
            XSelectInput(dpy, Tmp_win->icon_w, None);
            XDeleteContext(dpy, Tmp_win->icon_w, TwmContext);
            XDeleteContext(dpy, Tmp_win->icon_w, ScreenContext);
            CreateIconWindow(Tmp_win, icon_x, icon_y);
            break;
        }

        if (!Tmp_win->forced && Tmp_win->wmhints &&
            Tmp_win->wmhints->flags & IconWindowHint) {
            if (Tmp_win->icon_w) {
                int icon_x, icon_y;

                /*
                 * There's already an icon window.
                 * Try to find out where it is; if we succeed, move the new
                 * window to where the old one is.
                 */
                if (XGetGeometry(dpy, Tmp_win->icon_w, &wdummy, &icon_x,
                                 &icon_y, &udummy, &udummy, &udummy,
                                 &udummy)) {
                    /*
                     * Move the new icon window to where the old one was.
                     */
                    XMoveWindow(dpy, Tmp_win->wmhints->icon_window, icon_x,
                                icon_y);
                }

                /*
                 * If the window is iconic, map the new icon window.
                 */
                if (Tmp_win->icon)
                    XMapWindow(dpy, Tmp_win->wmhints->icon_window);

                /*
                 * Now, if the old window isn't ours, unmap it, otherwise
                 * just get rid of it completely.
                 */
                if (Tmp_win->icon_not_ours) {
                    if (Tmp_win->icon_w != Tmp_win->wmhints->icon_window)
                        XUnmapWindow(dpy, Tmp_win->icon_w);
                }
                else
                    XDestroyWindow(dpy, Tmp_win->icon_w);

                XDeleteContext(dpy, Tmp_win->icon_w, TwmContext);
                XDeleteContext(dpy, Tmp_win->icon_w, ScreenContext);

                /*
                 * The new icon window isn't our window, so note that fact
                 * so that we don't treat it as ours.
                 */
                Tmp_win->icon_not_ours = TRUE;

                /*
                 * Now make the new window the icon window for this window,
                 * and set it up to work as such (select for key presses
                 * and button presses/releases, set up the contexts for it,
                 * and define the cursor for it).
                 */
                Tmp_win->icon_w = Tmp_win->wmhints->icon_window;
                XSelectInput(dpy, Tmp_win->icon_w,
                             KeyPressMask | ButtonPressMask |
                             ButtonReleaseMask);
                XSaveContext(dpy, Tmp_win->icon_w, TwmContext,
                             (XPointer) Tmp_win);
                XSaveContext(dpy, Tmp_win->icon_w, ScreenContext,
                             (XPointer) Scr);
                XDefineCursor(dpy, Tmp_win->icon_w, Scr->IconCursor);
            }
        }

        if (Tmp_win->icon_w && !Tmp_win->forced && Tmp_win->wmhints &&
            (Tmp_win->wmhints->flags & IconPixmapHint)) {
            unsigned long valuemask;    /* mask for create windows */

            if (!XGetGeometry(dpy, Tmp_win->wmhints->icon_pixmap, &wdummy,
                              &dummy, &dummy,
                              (unsigned int *) &Tmp_win->icon_width,
                              (unsigned int *) &Tmp_win->icon_height, &udummy,
                              &udummy)) {
                return;
            }

            pm = XCreatePixmap(dpy, Scr->Root, (unsigned) Tmp_win->icon_width,
                               (unsigned) Tmp_win->icon_height,
                               (unsigned) Scr->d_depth);

            FB(Tmp_win->iconc.fore, Tmp_win->iconc.back);
            XCopyPlane(dpy, Tmp_win->wmhints->icon_pixmap, pm,
                       Scr->NormalGC,
                       0, 0, (unsigned) Tmp_win->icon_width,
                       (unsigned) Tmp_win->icon_height, 0, 0, 1);

            valuemask = CWBackPixmap;
            attributes.background_pixmap = pm;

            if (Tmp_win->icon_bm_w)
                XDestroyWindow(dpy, Tmp_win->icon_bm_w);

            Tmp_win->icon_bm_w =
                XCreateWindow(dpy, Tmp_win->icon_w, 0, 0,
                              (unsigned int) Tmp_win->icon_width,
                              (unsigned int) Tmp_win->icon_height,
                              (unsigned int) 0, Scr->d_depth,
                              (unsigned int) CopyFromParent, Scr->d_visual,
                              valuemask, &attributes);

            XFreePixmap(dpy, pm);
            RedoIconName();
        }
        break;

    case XA_WM_NORMAL_HINTS:
        GetWindowSizeHints(Tmp_win);
        break;

    default:
        if (Event.xproperty.atom == _XA_WM_COLORMAP_WINDOWS) {
            FetchWmColormapWindows(Tmp_win);    /* frees old data */
            break;
        }
        else if (Event.xproperty.atom == _XA_WM_PROTOCOLS) {
            FetchWmProtocols(Tmp_win);
            break;
        }
        break;
    }
}

/**
 * procedure to re-position the icon window and name
 */
static void
RedoIconName(void)
{
    int x, y;

    if (Tmp_win->list) {
        /* let the expose event cause the repaint */
        XClearArea(dpy, Tmp_win->list->w, 0, 0, 0, 0, True);

        if (Scr->SortIconMgr)
            SortIconManager(Tmp_win->list->iconmgr);
    }

    if (Tmp_win->icon_w == (Window) 0)
        return;

    if (Tmp_win->icon_not_ours)
        return;

    Tmp_win->icon_w_width = MyFont_TextWidth(&Scr->IconFont,
                                             Tmp_win->icon_name,
                                             (int) strlen(Tmp_win->icon_name));

    Tmp_win->icon_w_width += 6;
    if (Tmp_win->icon_w_width < Tmp_win->icon_width) {
        Tmp_win->icon_x = (Tmp_win->icon_width - Tmp_win->icon_w_width) / 2;
        Tmp_win->icon_x += 3;
        Tmp_win->icon_w_width = Tmp_win->icon_width;
    }
    else {
        Tmp_win->icon_x = 3;
    }

    if (Tmp_win->icon_w_width == Tmp_win->icon_width)
        x = 0;
    else
        x = (Tmp_win->icon_w_width - Tmp_win->icon_width) / 2;

    y = 0;

    Tmp_win->icon_w_height = Tmp_win->icon_height + Scr->IconFont.height + 4;
    Tmp_win->icon_y = Tmp_win->icon_height + Scr->IconFont.height;

    XResizeWindow(dpy, Tmp_win->icon_w, (unsigned) Tmp_win->icon_w_width,
                  (unsigned) Tmp_win->icon_w_height);
    if (Tmp_win->icon_bm_w) {
        XMoveWindow(dpy, Tmp_win->icon_bm_w, x, y);
        XMapWindow(dpy, Tmp_win->icon_bm_w);
    }
    if (Tmp_win->icon) {
        XClearArea(dpy, Tmp_win->icon_w, 0, 0, 0, 0, True);
    }
}

/**
 *client message event handler
 */
void
HandleClientMessage(void)
{
    int dummy = 0;
    unsigned udummy = 0;
    Window wdummy = None;

    if (Event.xclient.message_type == _XA_WM_CHANGE_STATE) {
        if (Tmp_win != NULL) {
            if (Event.xclient.data.l[0] == IconicState && !Tmp_win->icon) {
                XEvent button;

                XQueryPointer(dpy, Scr->Root, &wdummy, &wdummy,
                              &(button.xmotion.x_root),
                              &(button.xmotion.y_root),
                              &dummy, &dummy, &udummy);

                ExecuteFunction(F_ICONIFY, NULLSTR, Event.xany.window,
                                Tmp_win, &button, FRAME, FALSE);
                XUngrabPointer(dpy, CurrentTime);
            }
        }
    }
}

/**
 * expose event handler
 */
void
HandleExpose(void)
{
    XPointer context_data;

    if (XFindContext(dpy, Event.xany.window, MenuContext, &context_data) == 0) {
        MenuRoot *tmp = (MenuRoot *) context_data;
        PaintMenu(tmp, &Event);

        return;
    }

    if (Event.xexpose.count != 0)
        return;

    if (Event.xany.window == Scr->InfoWindow && InfoLines) {
        int i;
        int height;

        MyFont_ChangeGC(Scr->DefaultC.fore, Scr->DefaultC.back,
                        &Scr->DefaultFont);

        height = Scr->DefaultFont.height + 2;
        for (i = 0; i < InfoLines; i++) {
            MyFont_DrawString(dpy, Scr->InfoWindow, &Scr->DefaultFont,
                              Scr->NormalGC, 5,
                              (i * height) + Scr->DefaultFont.y, Info[i],
                              (int) strlen(Info[i]));
        }
        flush_expose(Event.xany.window);
    }
    else if (Tmp_win != NULL) {
        if (Event.xany.window == Tmp_win->title_w) {
            MyFont_ChangeGC(Tmp_win->title.fore, Tmp_win->title.back,
                            &Scr->TitleBarFont);

            MyFont_DrawString(dpy, Tmp_win->title_w, &Scr->TitleBarFont,
                              Scr->NormalGC, Scr->TBInfo.titlex,
                              Scr->TitleBarFont.y, Tmp_win->name,
                              (int) strlen(Tmp_win->name));
            flush_expose(Event.xany.window);
        }
        else if (Event.xany.window == Tmp_win->icon_w) {
            MyFont_ChangeGC(Tmp_win->iconc.fore, Tmp_win->iconc.back,
                            &Scr->IconFont);

            MyFont_DrawString(dpy, Tmp_win->icon_w, &Scr->IconFont,
                              Scr->NormalGC, Tmp_win->icon_x, Tmp_win->icon_y,
                              Tmp_win->icon_name,
                              (int) strlen(Tmp_win->icon_name));
            flush_expose(Event.xany.window);

            return;
        }
        else if (Tmp_win->titlebuttons) {
            int i;
            Window w = Event.xany.window;
            TBWindow *tbw;
            int nb = Scr->TBInfo.nleft + Scr->TBInfo.nright;

            for (i = 0, tbw = Tmp_win->titlebuttons; i < nb; i++, tbw++) {
                if (w == tbw->window) {
                    TitleButton *tb = tbw->info;

                    FB(Tmp_win->title.fore, Tmp_win->title.back);
                    XCopyPlane(dpy, tb->bitmap, w, Scr->NormalGC,
                               tb->srcx, tb->srcy, tb->width, tb->height,
                               tb->dstx, tb->dsty, 1);
                    flush_expose(w);
                    return;
                }
            }
        }
        if (Tmp_win->list) {
            if (Event.xany.window == Tmp_win->list->w) {
                MyFont_ChangeGC(Tmp_win->list->fore, Tmp_win->list->back,
                                &Scr->IconManagerFont);
                MyFont_DrawString(dpy, Event.xany.window,
                                  &Scr->IconManagerFont, Scr->NormalGC,
                                  iconmgr_textx, Scr->IconManagerFont.y + 4,
                                  Tmp_win->icon_name,
                                  (int) strlen(Tmp_win->icon_name));
                DrawIconManagerBorder(Tmp_win->list);
                flush_expose(Event.xany.window);

                return;
            }
            if (Event.xany.window == Tmp_win->list->icon) {
                FB(Tmp_win->list->fore, Tmp_win->list->back);
                XCopyPlane(dpy, Scr->siconifyPm, Tmp_win->list->icon,
                           Scr->NormalGC,
                           0, 0, (unsigned) iconifybox_width,
                           (unsigned) iconifybox_height, 0, 0, 1);
                flush_expose(Event.xany.window);

                return;
            }
        }
    }
}

static void
remove_window_from_ring(TwmWindow *tmp)
{
    TwmWindow *prev = tmp->ring.prev, *next = tmp->ring.next;

    if (enter_win == tmp) {
        enter_flag = FALSE;
        enter_win = NULL;
    }
    if (raise_win == Tmp_win)
        raise_win = NULL;

    /*
     * 1. Unlink window
     * 2. If window was only thing in ring, null out ring
     * 3. If window was ring leader, set to next (or null)
     */
    if (prev)
        prev->ring.next = next;
    if (next)
        next->ring.prev = prev;
    if (Scr->Ring == tmp)
        Scr->Ring = (next != tmp ? next : (TwmWindow *) NULL);

    if (!Scr->Ring || Scr->RingLeader == tmp)
        Scr->RingLeader = Scr->Ring;
}

/**
 * DestroyNotify event handler
 */
void
HandleDestroyNotify(void)
{

    /*
     * Warning, this is also called by HandleUnmapNotify; if it ever needs to
     * look at the event, HandleUnmapNotify will have to mash the UnmapNotify
     * into a DestroyNotify.
     */

    if (Tmp_win == NULL)
        return;

    if (Tmp_win == Scr->Focus) {
        FocusOnRoot();
    }
    XDeleteContext(dpy, Tmp_win->w, TwmContext);
    XDeleteContext(dpy, Tmp_win->w, ScreenContext);
    XDeleteContext(dpy, Tmp_win->frame, TwmContext);
    XDeleteContext(dpy, Tmp_win->frame, ScreenContext);
    if (Tmp_win->icon_w) {
        XDeleteContext(dpy, Tmp_win->icon_w, TwmContext);
        XDeleteContext(dpy, Tmp_win->icon_w, ScreenContext);
    }
    if (Tmp_win->title_height) {
        int nb = Scr->TBInfo.nleft + Scr->TBInfo.nright;

        XDeleteContext(dpy, Tmp_win->title_w, TwmContext);
        XDeleteContext(dpy, Tmp_win->title_w, ScreenContext);
        if (Tmp_win->hilite_w) {
            XDeleteContext(dpy, Tmp_win->hilite_w, TwmContext);
            XDeleteContext(dpy, Tmp_win->hilite_w, ScreenContext);
        }

        if (Tmp_win->titlebuttons) {
            int i;

            for (i = 0; i < nb; i++) {
                XDeleteContext(dpy, Tmp_win->titlebuttons[i].window,
                               TwmContext);
                XDeleteContext(dpy, Tmp_win->titlebuttons[i].window,
                               ScreenContext);
            }
        }
    }

    if (Scr->cmapInfo.cmaps == &Tmp_win->cmaps)
        InstallWindowColormaps(DestroyNotify, &Scr->TwmRoot);

    /*
     * TwmWindows contain the following pointers
     *
     *     1.  full_name
     *     2.  name
     *     3.  icon_name
     *     4.  wmhints
     *     5.  class.res_name
     *     6.  class.res_class
     *     7.  list
     *     8.  iconmgrp
     *     9.  cwins
     *     10. titlebuttons
     *     11. window ring
     */
    if (Tmp_win->gray)
        XFreePixmap(dpy, Tmp_win->gray);

    XDestroyWindow(dpy, Tmp_win->frame);
    if (Tmp_win->icon_w && !Tmp_win->icon_not_ours) {
        XDestroyWindow(dpy, Tmp_win->icon_w);
        IconDown(Tmp_win);
    }
    RemoveIconManager(Tmp_win); /* 7 */
    Tmp_win->prev->next = Tmp_win->next;
    if (Tmp_win->next != NULL)
        Tmp_win->next->prev = Tmp_win->prev;
    if (Tmp_win->auto_raise)
        Scr->NumAutoRaises--;

    free_window_names(Tmp_win, True, True, True);       /* 1, 2, 3 */
    if (Tmp_win->wmhints)       /* 4 */
        XFree(Tmp_win->wmhints);
    if (Tmp_win->class.res_name && Tmp_win->class.res_name != NoName)   /* 5 */
        XFree(Tmp_win->class.res_name);
    if (Tmp_win->class.res_class && Tmp_win->class.res_class != NoName) /* 6 */
        XFree(Tmp_win->class.res_class);
    free_cwins(Tmp_win);        /* 9 */
    if (Tmp_win->titlebuttons)  /* 10 */
        free(Tmp_win->titlebuttons);
    remove_window_from_ring(Tmp_win);   /* 11 */

    if (UnHighLight_win == Tmp_win)
        UnHighLight_win = NULL;

    free(Tmp_win);
}

void
HandleCreateNotify(void)
{
#ifdef DEBUG_EVENTS
    fprintf(stderr, "CreateNotify w = 0x%x\n", Event.xcreatewindow.window);

    fflush(stderr);
    Bell(XkbBI_Info, 0, Event.xcreatewindow.window);

    XSync(dpy, 0);
#endif
}

/**
 *      HandleMapRequest - MapRequest event handler
 */
void
HandleMapRequest(void)
{
    XPointer context_data;

    Event.xany.window = Event.xmaprequest.window;
    if (XFindContext(dpy, Event.xany.window, TwmContext, &context_data) == 0)
        Tmp_win = (TwmWindow *) context_data;

    else
        Tmp_win = NULL;

    /* If the window has never been mapped before ... */
    if (Tmp_win == NULL) {
        /* Add decorations. */
        Tmp_win = AddWindow(Event.xany.window, FALSE, (IconMgr *) NULL);

        if (Tmp_win == NULL)
            return;
    }
    else {
        /*
         * If the window has been unmapped by the client, it won't be listed
         * in the icon manager.  Add it again, if requested.
         */
        if (Tmp_win->list == NULL)
            (void) AddIconManager(Tmp_win);
    }

    /* If it's not merely iconified, and we have hints, use them. */
    if ((!Tmp_win->icon) &&
        Tmp_win->wmhints && (Tmp_win->wmhints->flags & StateHint)) {
        int state;
        int zoom_save;
        Window icon;

        /* use WM_STATE if enabled */
        if (!(RestartPreviousState && GetWMState(Tmp_win->w, &state, &icon) &&
              (state == NormalState || state == IconicState)))
            state = Tmp_win->wmhints->initial_state;

        switch (state) {
        case DontCareState:
        case NormalState:
        case ZoomState:
        case InactiveState:
            XMapWindow(dpy, Tmp_win->w);
            XMapWindow(dpy, Tmp_win->frame);
            SetMapStateProp(Tmp_win, NormalState);
            SetRaiseWindow(Tmp_win);
            break;

        case IconicState:
            zoom_save = Scr->DoZoom;
            Scr->DoZoom = FALSE;
            Iconify(Tmp_win, 0, 0);
            Scr->DoZoom = (short) zoom_save;
            break;
        }
    }
    /* If no hints, or currently an icon, just "deiconify" */
    else {
        DeIconify(Tmp_win);
        SetRaiseWindow(Tmp_win);
    }
}

void
SimulateMapRequest(Window w)
{
    Event.xmaprequest.window = w;

    HandleMapRequest();
}

/**
 *      MapNotify event handler
 */
void
HandleMapNotify(void)
{
    if (Tmp_win == NULL)
        return;

    /*
     * Need to do the grab to avoid race condition of having server send
     * MapNotify to client before the frame gets mapped; this is bad because
     * the client would think that the window has a chance of being viewable
     * when it really isn't.
     */
    XGrabServer(dpy);
    if (Tmp_win->icon_w)
        XUnmapWindow(dpy, Tmp_win->icon_w);
    if (Tmp_win->title_w)
        XMapSubwindows(dpy, Tmp_win->title_w);
    XMapSubwindows(dpy, Tmp_win->frame);
    if (Scr->Focus != Tmp_win && Tmp_win->hilite_w)
        XUnmapWindow(dpy, Tmp_win->hilite_w);

    XMapWindow(dpy, Tmp_win->frame);
    XUngrabServer(dpy);
    XFlush(dpy);
    Tmp_win->mapped = TRUE;
    Tmp_win->icon = FALSE;
    Tmp_win->icon_on = FALSE;
}

/**
 * UnmapNotify event handler
 */
void
HandleUnmapNotify(void)
{
    int dstx, dsty;
    Window dumwin;
    XPointer context_data;

    /*
     * The July 27, 1988 ICCCM spec states that a client wishing to switch
     * to WithdrawnState should send a synthetic UnmapNotify with the
     * event field set to (pseudo-)root, in case the window is already
     * unmapped (which is the case for twm for IconicState).  Unfortunately,
     * we looked for the TwmContext using that field, so try the window
     * field also.
     */
    if (Tmp_win == NULL) {
        Event.xany.window = Event.xunmap.window;
        if (XFindContext(dpy, Event.xany.window,
                         TwmContext, &context_data) == 0)
            Tmp_win = (TwmWindow *) context_data;

        else
            Tmp_win = NULL;
    }

    if (Tmp_win == NULL || (!Tmp_win->mapped && !Tmp_win->icon))
        return;

    /*
     * The program may have unmapped the client window, from either
     * NormalState or IconicState.  Handle the transition to WithdrawnState.
     *
     * We need to reparent the window back to the root (so that twm exiting
     * won't cause it to get mapped) and then throw away all state (pretend
     * that we've received a DestroyNotify).
     */

    XGrabServer(dpy);
    if (XTranslateCoordinates(dpy, Event.xunmap.window, Tmp_win->attr.root,
                              0, 0, &dstx, &dsty, &dumwin)) {
        XEvent ev;
        Bool reparented = XCheckTypedWindowEvent(dpy, Event.xunmap.window,
                                                 ReparentNotify, &ev);

        SetMapStateProp(Tmp_win, WithdrawnState);
        if (reparented) {
            if (Tmp_win->old_bw)
                XSetWindowBorderWidth(dpy,
                                      Event.xunmap.window,
                                      (unsigned) Tmp_win->old_bw);
            if (Tmp_win->wmhints && (Tmp_win->wmhints->flags & IconWindowHint))
                XUnmapWindow(dpy, Tmp_win->wmhints->icon_window);
        }
        else {
            XReparentWindow(dpy, Event.xunmap.window, Tmp_win->attr.root,
                            dstx, dsty);
            RestoreWithdrawnLocation(Tmp_win);
        }
        XRemoveFromSaveSet(dpy, Event.xunmap.window);
        XSelectInput(dpy, Event.xunmap.window, NoEventMask);

        HandleDestroyNotify();  /* do not need to mash event before */
    }                           /* else window no longer exists and we'll get a destroy notify */
    XUngrabServer(dpy);
    XFlush(dpy);
}

/**
 * MotionNotify event handler
 */
void
HandleMotionNotify(void)
{
    XPointer context_data;
    unsigned udummy = 0;
    Window wdummy = None;

    if (ResizeWindow != (Window) 0) {
        XQueryPointer(dpy, Event.xany.window,
                      &(Event.xmotion.root), &wdummy,
                      &(Event.xmotion.x_root), &(Event.xmotion.y_root),
                      &(Event.xmotion.x), &(Event.xmotion.y), &udummy);

        /* Set WindowMoved appropriately so that f.deltastop will
           work with resize as well as move. */
        if (abs(Event.xmotion.x - ResizeOrigX) >= Scr->MoveDelta
            || abs(Event.xmotion.y - ResizeOrigY) >= Scr->MoveDelta)
             WindowMoved = TRUE;

        if (XFindContext(dpy, ResizeWindow, TwmContext, &context_data) == 0)
            Tmp_win = (TwmWindow *) context_data;
        DoResize(Event.xmotion.x_root, Event.xmotion.y_root, Tmp_win);
    }
}

/**
 * ButtonRelease event handler
 */
void
HandleButtonRelease(void)
{
    unsigned mask;
    XPointer context_data;

    if (InfoLines)              /* delete info box on 2nd button release  */
        if (Context == C_IDENTIFY) {
            XUnmapWindow(dpy, Scr->InfoWindow);
            InfoLines = 0;
            Context = C_NO_CONTEXT;
        }

    if (DragWindow != None) {
        int xl, yt;
        int w, h;

        MoveOutline(Scr->Root, 0, 0, 0, 0, 0, 0);

        if (XFindContext(dpy, DragWindow, TwmContext, &context_data) == 0)
            Tmp_win = (TwmWindow *) context_data;
        if (DragWindow == Tmp_win->frame) {
            xl = Event.xbutton.x_root - DragX - Tmp_win->frame_bw;
            yt = Event.xbutton.y_root - DragY - Tmp_win->frame_bw;

            w = DragWidth + 2 * Tmp_win->frame_bw;
            h = DragHeight + 2 * Tmp_win->frame_bw;
        }
        else {
            xl = Event.xbutton.x_root - DragX - Scr->IconBorderWidth;
            yt = Event.xbutton.y_root - DragY - Scr->IconBorderWidth;

            w = DragWidth + 2 * Scr->IconBorderWidth;
            h = DragHeight + 2 * Scr->IconBorderWidth;
        }

        if (ConstMove) {
            if (ConstMoveDir == MOVE_HORIZ)
                yt = ConstMoveY;

            if (ConstMoveDir == MOVE_VERT)
                xl = ConstMoveX;

            if (ConstMoveDir == MOVE_NONE) {
                yt = ConstMoveY;
                xl = ConstMoveX;
            }
        }

        if (Scr->DontMoveOff && MoveFunction != F_FORCEMOVE) {
            int xr = xl + w;
            int yb = yt + h;

            if (xl < 0)
                xl = 0;
            if (xr > Scr->MyDisplayWidth)
                xl = Scr->MyDisplayWidth - w;

            if (yt < 0)
                yt = 0;
            if (yb > Scr->MyDisplayHeight)
                yt = Scr->MyDisplayHeight - h;
        }

        CurrentDragX = xl;
        CurrentDragY = yt;
        if (DragWindow == Tmp_win->frame)
            SetupWindow(Tmp_win, xl, yt,
                        Tmp_win->frame_width, Tmp_win->frame_height, -1);
        else
            XMoveWindow(dpy, DragWindow, xl, yt);

        if (!Scr->NoRaiseMove && !Scr->OpaqueMove)      /* opaque already did */
            XRaiseWindow(dpy, DragWindow);

        if (!Scr->OpaqueMove)
            UninstallRootColormap();
        else
            XSync(dpy, 0);

        if (Scr->NumAutoRaises) {
            enter_flag = TRUE;
            enter_win = NULL;
            raise_win = ((DragWindow == Tmp_win->frame && !Scr->NoRaiseMove)
                         ? Tmp_win : NULL);
        }

        DragWindow = (Window) 0;
        ConstMove = FALSE;
    }

    if (ResizeWindow != (Window) 0) {
        EndResize();
    }

    if (ActiveMenu != NULL && RootFunction == 0) {
        if (ActiveItem != NULL) {
            int func = ActiveItem->func;

            Action = ActiveItem->action;
            switch (func) {
            case F_MOVE:
            case F_FORCEMOVE:
                ButtonPressed = -1;
                break;
            case F_WARPTOSCREEN:
                XUngrabPointer(dpy, CurrentTime);
                /* fall through */
            case F_CIRCLEUP:
            case F_CIRCLEDOWN:
            case F_REFRESH:
                PopDownMenu();
                break;
            default:
                break;
            }
            ExecuteFunction(func, Action,
                            ButtonWindow ? ButtonWindow->frame : None,
                            ButtonWindow, &Event /*&ButtonEvent */ , Context,
                            TRUE);

            Context = C_NO_CONTEXT;
            ButtonWindow = NULL;

            /* if we are not executing a deferred command, then take down the
             * menu
             */
            if (RootFunction == 0) {
                PopDownMenu();
            }
        }
        else
            PopDownMenu();
    }

    mask =
        (Button1Mask | Button2Mask | Button3Mask | Button4Mask | Button5Mask);
    switch (Event.xbutton.button) {
        /* *INDENT-OFF* */
        case Button1: mask &= (unsigned)(~Button1Mask); break;
        case Button2: mask &= (unsigned)(~Button2Mask); break;
        case Button3: mask &= (unsigned)(~Button3Mask); break;
        case Button4: mask &= (unsigned)(~Button4Mask); break;
        case Button5: mask &= (unsigned)(~Button5Mask); break;
        /* *INDENT-ON* */
    }

    if (RootFunction != 0 || ResizeWindow != None || DragWindow != None)
        ButtonPressed = -1;

    if (RootFunction == 0 &&
        (Event.xbutton.state & mask) == 0 &&
        DragWindow == None && ResizeWindow == None) {
        XUngrabPointer(dpy, CurrentTime);
        XUngrabServer(dpy);
        XFlush(dpy);
        EventHandler[EnterNotify] = HandleEnterNotify;
        EventHandler[LeaveNotify] = HandleLeaveNotify;
        ButtonPressed = -1;
        if (DownIconManager) {
            DownIconManager->down = FALSE;
            if (Scr->Highlight)
                DrawIconManagerBorder(DownIconManager);
            DownIconManager = NULL;
        }
        Cancel = FALSE;
    }
}

/**
 *
 * \param menu menu to pop up
 * \param w    invoking window, or None
 */
static void
do_menu(MenuRoot *menu, Window w)
{
    int x = Event.xbutton.x_root;
    int y = Event.xbutton.y_root;
    Bool center;

    if (!Scr->NoGrabServer)
        XGrabServer(dpy);
    if (w) {
        int h = Scr->TBInfo.width - Scr->TBInfo.border;
        Window child;

        (void) XTranslateCoordinates(dpy, w, Scr->Root, 0, h, &x, &y, &child);
        center = False;
    }
    else {
        center = True;
    }
    if (PopUpMenu(menu, x, y, center)) {
        UpdateMenu();
    }
    else {
        Bell(XkbBI_MinorError, 0, w);
    }
}

/**
 * ButtonPress event handler
 */
void
HandleButtonPress(void)
{
    unsigned int modifier;
    Cursor cur;
    int dummy = 0;
    Window wdummy = None;

    /* too much code relies on this assumption */
    if (Event.xbutton.button > MAX_BUTTONS)
        return;

    /* pop down the menu, if any */
    if (ActiveMenu != NULL)
        PopDownMenu();

    XSync(dpy, 0);              /* XXX - remove? */

    if (ButtonPressed != -1 && !InfoLines) {    /* want menus if we have info box */
        /* we got another butt press in addition to one still held
         * down, we need to cancel the operation we were doing
         */
        Cancel = TRUE;
        CurrentDragX = origDragX;
        CurrentDragY = origDragY;
        if (!menuFromFrameOrWindowOrTitlebar) {
            if (Scr->OpaqueMove && DragWindow != None) {
                XMoveWindow(dpy, DragWindow, origDragX, origDragY);
            }
            else {
                MoveOutline(Scr->Root, 0, 0, 0, 0, 0, 0);
            }
        }
        XUnmapWindow(dpy, Scr->SizeWindow);
        if (!Scr->OpaqueMove)
            UninstallRootColormap();
        ResizeWindow = None;
        DragWindow = None;
        cur = LeftButt;
        if (Event.xbutton.button == Button2)
            cur = MiddleButt;
        else if (Event.xbutton.button >= Button3)
            cur = RightButt;

        XGrabPointer(dpy, Scr->Root, True,
                     ButtonReleaseMask | ButtonPressMask,
                     GrabModeAsync, GrabModeAsync, Scr->Root, cur, CurrentTime);

        return;
    }
    else
        ButtonPressed = (int) Event.xbutton.button;

    if (ResizeWindow != None || DragWindow != None || ActiveMenu != NULL)
        return;

    /* check the title bar buttons */
    if (Tmp_win && Tmp_win->title_height && Tmp_win->titlebuttons) {
        int i;
        TBWindow *tbw;
        int nb = Scr->TBInfo.nleft + Scr->TBInfo.nright;

        for (i = 0, tbw = Tmp_win->titlebuttons; i < nb; i++, tbw++) {
            if (Event.xany.window == tbw->window) {
                if (tbw->info->func == F_MENU) {
                    Context = C_TITLE;
                    ButtonEvent = Event;

                    ButtonWindow = Tmp_win;
                    do_menu(tbw->info->menuroot, tbw->window);
                }
                else {
                    ExecuteFunction(tbw->info->func, tbw->info->action,
                                    Event.xany.window, Tmp_win, &Event,
                                    C_TITLE, FALSE);
                }
                return;
            }
        }
    }

    Context = C_NO_CONTEXT;

    if (Event.xany.window == Scr->InfoWindow)
        Context = C_IDENTIFY;

    if (Event.xany.window == Scr->Root)
        Context = C_ROOT;
    if (Tmp_win) {
        if (Tmp_win->list && RootFunction != 0 &&
            (Event.xany.window == Tmp_win->list->w ||
             Event.xany.window == Tmp_win->list->icon)) {
            int x = 0;
            int y = 0;

            Tmp_win = Tmp_win->list->iconmgr->twm_win;

            XTranslateCoordinates(dpy, Event.xany.window, Tmp_win->w,
                                  Event.xbutton.x, Event.xbutton.y,
                                  &x, &y, &wdummy);

            Event.xbutton.x = x;
            Event.xbutton.y = y - Tmp_win->title_height;
            Event.xany.window = Tmp_win->w;

            Context = C_WINDOW;
        }
        else if (Event.xany.window == Tmp_win->title_w) {
            Context = C_TITLE;
        }
        else if (Event.xany.window == Tmp_win->w) {
            printf("ERROR! ERROR! ERROR! YOU SHOULD NOT BE HERE!!!\n");
            Context = C_WINDOW;
        }
        else if (Event.xany.window == Tmp_win->icon_w) {
            Context = C_ICON;
        }
        else if (Event.xany.window == Tmp_win->frame) {
            /* since we now place a button grab on the frame instead
             * of the window, (see GrabButtons() in add_window.c), we
             * need to figure out where the pointer exactly is before
             * assigning Context.  If the pointer is on the application
             * window we will change the event structure to look as if
             * it came from the application window.
             */
            if (Event.xbutton.subwindow == Tmp_win->w) {
                Event.xbutton.window = Tmp_win->w;
                Event.xbutton.y -= Tmp_win->title_height;

/*****
              Event.xbutton.x -= Tmp_win->frame_bw;
*****/
                Context = C_WINDOW;
            }
            else
                Context = C_FRAME;
        }
        else if (Tmp_win->list &&
                 (Event.xany.window == Tmp_win->list->w ||
                  Event.xany.window == Tmp_win->list->icon)) {
            Tmp_win->list->down = TRUE;
            if (Scr->Highlight)
                DrawIconManagerBorder(Tmp_win->list);
            DownIconManager = Tmp_win->list;
            Context = C_ICONMGR;
        }
    }

    /* this section of code checks to see if we were in the middle of
     * a command executed from a menu
     */
    if (RootFunction != 0) {
        if (Event.xany.window == Scr->Root) {
            /* if the window was the Root, we don't know for sure it
             * it was the root.  We must check to see if it happened to be
             * inside of a client that was getting button press events.
             */
            XPointer context_data;
            int x = 0;
            int y = 0;

            XTranslateCoordinates(dpy, Scr->Root, Scr->Root,
                                  Event.xbutton.x,
                                  Event.xbutton.y,
                                  &dummy, &dummy, &Event.xany.window);

            if (Event.xany.window == 0 ||
                (XFindContext(dpy, Event.xany.window, TwmContext,
                              &context_data) == XCNOENT)) {
                RootFunction = 0;
                Bell(XkbBI_MinorError, 0, Event.xany.window);

                return;
            }
            else
                Tmp_win = (TwmWindow *) context_data;

            XTranslateCoordinates(dpy, Scr->Root, Event.xany.window,
                                  Event.xbutton.x,
                                  Event.xbutton.y, &x, &y, &wdummy);

            Event.xbutton.x = x;
            Event.xbutton.y = y;

            Context = C_WINDOW;
        }

        /* make sure we are not trying to move an identify window */
        if (Event.xany.window != Scr->InfoWindow)
            ExecuteFunction(RootFunction, Action, Event.xany.window,
                            Tmp_win, &Event, Context, FALSE);

        RootFunction = 0;
        return;
    }

    ButtonEvent = Event;

    ButtonWindow = Tmp_win;

    /* if we get to here, we have to execute a function or pop up a
     * menu
     */
    modifier = (Event.xbutton.state & mods_used);

    if (Context == C_NO_CONTEXT)
        return;

    RootFunction = 0;
    if (Scr->Mouse[Event.xbutton.button][Context][modifier].func == F_MENU) {
        do_menu(Scr->Mouse[Event.xbutton.button][Context][modifier].menu,
                (Window) None);
    }
    else if (Scr->Mouse[Event.xbutton.button][Context][modifier].func != 0) {
        Action = Scr->Mouse[Event.xbutton.button][Context][modifier].item ?
            Scr->Mouse[Event.xbutton.button][Context][modifier].
            item->action : NULL;
        ExecuteFunction(Scr->
                        Mouse[Event.xbutton.button][Context][modifier].func,
                        Action, Event.xany.window, Tmp_win, &Event, Context,
                        FALSE);
    }
    else if (Scr->DefaultFunction.func != 0) {
        if (Scr->DefaultFunction.func == F_MENU) {
            do_menu(Scr->DefaultFunction.menu, (Window) None);
        }
        else {
            Action = Scr->DefaultFunction.item ?
                Scr->DefaultFunction.item->action : NULL;
            ExecuteFunction(Scr->DefaultFunction.func, Action,
                            Event.xany.window, Tmp_win, &Event, Context, FALSE);
        }
    }
}

/** \fn HENQueueScanner
 * EnterNotify event q scanner.
 *
 *      Looks at the queued events and determines if any matching
 *      LeaveNotify events or EnterEvents deriving from the
 *      termination of a grab are behind this event to allow
 *      skipping of unnecessary processing.
 */
typedef struct HENScanArgs {
    Window w;           /**< Window we are currently entering */
    Bool leaves;        /**< Any LeaveNotifies found for this window */
    Bool inferior;      /**< Was NotifyInferior the mode for LeaveNotify */
    Bool enters;        /**< Any EnterNotify events with NotifyUngrab */
} HENScanArgs;

static Bool
HENQueueScanner(Display *dpy2 _X_UNUSED, XEvent *ev, char *args)
{
    if (ev->type == LeaveNotify) {
        if (ev->xcrossing.window == ((HENScanArgs *) args)->w &&
            ev->xcrossing.mode == NotifyNormal) {
            ((HENScanArgs *) args)->leaves = True;
            /*
             * Only the last event found matters for the Inferior field.
             */
            ((HENScanArgs *) args)->inferior =
                (ev->xcrossing.detail == NotifyInferior);
        }
    }
    else if (ev->type == EnterNotify) {
        if (ev->xcrossing.mode == NotifyUngrab)
            ((HENScanArgs *) args)->enters = True;
    }

    return (False);
}

/**
 * EnterNotify event handler
 */
void
HandleEnterNotify(void)
{
    MenuRoot *mr;
    XEnterWindowEvent *ewp = &Event.xcrossing;
    HENScanArgs scanArgs;
    XEvent dummy;
    XPointer context_data;

    /*
     * Save the id of the window entered.  This will be used to remove
     * border highlight on entering the next application window.
     */
    if (UnHighLight_win && ewp->window != UnHighLight_win->w) {
        SetBorder(UnHighLight_win, False);      /* application window */
        if (UnHighLight_win->list)      /* in the icon box */
            NotActiveIconManager(UnHighLight_win->list);
    }
    if (ewp->window == Scr->Root)
        UnHighLight_win = NULL;
    else if (Tmp_win)
        UnHighLight_win = Tmp_win;

    /*
     * if we aren't in the middle of menu processing
     */
    if (!ActiveMenu) {
        /*
         * We're not interested in pseudo Enter/Leave events generated
         * from grab initiations.
         */
        if (ewp->mode == NotifyGrab)
            return;

        /*
         * Scan for Leave and Enter Notify events to see if we can avoid some
         * unnecessary processing.
         */
        scanArgs.w = ewp->window;
        scanArgs.leaves = scanArgs.enters = False;
        (void) XCheckIfEvent(dpy, &dummy, HENQueueScanner, (char *) &scanArgs);

        /*
         * if entering root window, restore twm default colormap so that
         * titlebars are legible
         */
        if (ewp->window == Scr->Root) {
            if (!scanArgs.leaves && !scanArgs.enters)
                InstallWindowColormaps(EnterNotify, &Scr->TwmRoot);
            return;
        }

        /*
         * if we have an event for a specific one of our windows
         */
        if (Tmp_win) {
            /*
             * If currently in PointerRoot mode (indicated by FocusRoot), then
             * focus on this window
             */
            if (Scr->FocusRoot && (!scanArgs.leaves || scanArgs.inferior)) {
                if (Tmp_win->list)
                    ActiveIconManager(Tmp_win->list);
                if (Tmp_win->mapped) {
                    /*
                     * unhighlight old focus window
                     */
                    if (Scr->Focus &&
                        Scr->Focus != Tmp_win && Tmp_win->hilite_w)
                        XUnmapWindow(dpy, Scr->Focus->hilite_w);

                    /*
                     * If entering the frame or the icon manager, then do
                     * "window activation things":
                     *
                     *     1.  turn on highlight window (if any)
                     *     2.  install frame colormap
                     *     3.  set frame and highlight window (if any) border
                     *     4.  focus on client window to forward typing
                     *     4a. same as 4 but for icon mgr w/with NoTitlebar on.
                     *     5.  send WM_TAKE_FOCUS if requested
                     */
                    if (ewp->window == Tmp_win->frame ||
                        (Tmp_win->list && ewp->window == Tmp_win->list->w)) {
                        if (Tmp_win->hilite_w)  /* 1 */
                            XMapWindow(dpy, Tmp_win->hilite_w);
                        if (!scanArgs.leaves && !scanArgs.enters)
                            InstallWindowColormaps(EnterNotify, /* 2 */
                                                   &Scr->TwmRoot);
                        SetBorder(Tmp_win, True);       /* 3 */
                        if (Tmp_win->title_w && Scr->TitleFocus &&      /* 4 */
                            Tmp_win->wmhints && Tmp_win->wmhints->input)
                            SetFocus(Tmp_win, ewp->time);
                        if (Scr->NoTitlebar && Scr->TitleFocus &&       /*4a */
                            Tmp_win->wmhints && Tmp_win->wmhints->input)
                            SetFocus(Tmp_win, ewp->time);
                        if (Tmp_win->protocols & DoesWmTakeFocus)       /* 5 */
                            SendTakeFocusMessage(Tmp_win, ewp->time);
                        Scr->Focus = Tmp_win;
                    }
                    else if (ewp->window == Tmp_win->w) {
                        /*
                         * If we are entering the application window, install
                         * its colormap(s).
                         */
                        if (!scanArgs.leaves || scanArgs.inferior)
                            InstallWindowColormaps(EnterNotify, Tmp_win);
                    }
                }               /* end if Tmp_win->mapped */
                if (Tmp_win->wmhints != NULL &&
                    ewp->window == Tmp_win->wmhints->icon_window &&
                    (!scanArgs.leaves || scanArgs.inferior))
                    InstallWindowColormaps(EnterNotify, Tmp_win);
            }                   /* end if FocusRoot */
            /*
             * If this window is to be autoraised, mark it so
             */
            if (Tmp_win->auto_raise) {
                enter_win = Tmp_win;
                if (enter_flag == FALSE)
                    AutoRaiseWindow(Tmp_win);
            }
            else if (enter_flag && raise_win == Tmp_win)
                enter_win = Tmp_win;
            /*
             * set ring leader
             */
            if (Tmp_win->ring.next && (!enter_flag || raise_win == enter_win))
                Scr->RingLeader = Tmp_win;
            XSync(dpy, 0);
            return;
        }                       /* end if Tmp_win */
    }                           /* end if !ActiveMenu */

    /*
     * Find the menu that we are dealing with now; punt if unknown
     */
    if (XFindContext(dpy, ewp->window, MenuContext, &context_data) == 0)
        mr = (MenuRoot *) context_data;
    else
        return;

    mr->entered = TRUE;
    if (ActiveMenu && mr == ActiveMenu->prev && RootFunction == 0) {
        if (Scr->Shadow)
            XUnmapWindow(dpy, ActiveMenu->shadow);
        XUnmapWindow(dpy, ActiveMenu->w);
        ActiveMenu->mapped = UNMAPPED;
        UninstallRootColormap();
        if (ActiveItem) {
            ActiveItem->state = 0;
            PaintEntry(ActiveMenu, ActiveItem, False);
        }
        ActiveItem = NULL;
        ActiveMenu = mr;
        MenuDepth--;
    }
    return;
}

/** \fn HLNQueueScanner
 *  LeaveNotify event q scanner.
 *
 *      Looks at the queued events and determines if any
 *      EnterNotify events are behind this event to allow
 *      skipping of unnecessary processing.
 */

typedef struct HLNScanArgs {
    Window w;           /**< The window getting the LeaveNotify */
    Bool enters;        /**< Any EnterNotify event at all */
    Bool matches;       /**< Any matching EnterNotify events */
} HLNScanArgs;

static Bool
HLNQueueScanner(Display *dpy2 _X_UNUSED, XEvent *ev, char *args)
{
    if (ev->type == EnterNotify && ev->xcrossing.mode != NotifyGrab) {
        ((HLNScanArgs *) args)->enters = True;
        if (ev->xcrossing.window == ((HLNScanArgs *) args)->w)
            ((HLNScanArgs *) args)->matches = True;
    }

    return (False);
}

/**
 * LeaveNotify event handler
 */
void
HandleLeaveNotify(void)
{
    HLNScanArgs scanArgs;
    XEvent dummy;

    if (Tmp_win != NULL) {
        Bool inicon;

        /*
         * We're not interested in pseudo Enter/Leave events generated
         * from grab initiations and terminations.
         */
        if (Event.xcrossing.mode != NotifyNormal)
            return;

        inicon = (Tmp_win->list && Tmp_win->list->w == Event.xcrossing.window);

        if (Scr->RingLeader && Scr->RingLeader == Tmp_win &&
            (Event.xcrossing.detail != NotifyInferior &&
             Event.xcrossing.window != Tmp_win->w)) {
            if (!inicon) {
                if (Tmp_win->mapped) {
                    Tmp_win->ring.cursor_valid = False;
                }
                else {
                    Tmp_win->ring.cursor_valid = True;
                    Tmp_win->ring.curs_x = (Event.xcrossing.x_root -
                                            Tmp_win->frame_x);
                    Tmp_win->ring.curs_y = (Event.xcrossing.y_root -
                                            Tmp_win->frame_y);
                }
            }
            Scr->RingLeader = (TwmWindow *) NULL;
        }
        if (Scr->FocusRoot) {

            if (Event.xcrossing.detail != NotifyInferior) {

                /*
                 * Scan for EnterNotify events to see if we can avoid some
                 * unnecessary processing.
                 */
                scanArgs.w = Event.xcrossing.window;

                scanArgs.enters = scanArgs.matches = False;
                (void) XCheckIfEvent(dpy, &dummy, HLNQueueScanner,
                                     (char *) &scanArgs);

                if ((Event.xcrossing.window == Tmp_win->frame &&
                     !scanArgs.matches) ||inicon) {
                    if (Tmp_win->list)
                        NotActiveIconManager(Tmp_win->list);
                    if (Tmp_win->hilite_w)
                        XUnmapWindow(dpy, Tmp_win->hilite_w);
                    SetBorder(Tmp_win, False);
                    if (Scr->TitleFocus || Tmp_win->protocols & DoesWmTakeFocus)
                        SetFocus((TwmWindow *) NULL, Event.xcrossing.time);

                    Scr->Focus = NULL;
                }
                else if (Event.xcrossing.window == Tmp_win->w &&
                         !scanArgs.enters) {
                    InstallWindowColormaps(LeaveNotify, &Scr->TwmRoot);
                }
            }
        }
        XSync(dpy, 0);
        return;
    }
}

/**
 *      HandleConfigureRequest - ConfigureRequest event handler
 */
void
HandleConfigureRequest(void)
{
    XWindowChanges xwc;
    int x, y, width, height, bw;
    int gravx, gravy;
    XConfigureRequestEvent *cre = &Event.xconfigurerequest;
    XPointer context_data;

#ifdef DEBUG_EVENTS
    fprintf(stderr, "ConfigureRequest\n");
    if (cre->value_mask & CWX)
        fprintf(stderr, "  x = %d\n", cre->x);
    if (cre->value_mask & CWY)
        fprintf(stderr, "  y = %d\n", cre->y);
    if (cre->value_mask & CWWidth)
        fprintf(stderr, "  width = %d\n", cre->width);
    if (cre->value_mask & CWHeight)
        fprintf(stderr, "  height = %d\n", cre->height);
    if (cre->value_mask & CWSibling)
        fprintf(stderr, "  above = 0x%x\n", cre->above);
    if (cre->value_mask & CWStackMode)
        fprintf(stderr, "  stack = %d\n", cre->detail);
#endif

    /*
     * Event.xany.window is Event.xconfigurerequest.parent, so Tmp_win will
     * be wrong
     */
    Event.xany.window = cre->window;    /* mash parent field */

    if (XFindContext(dpy, cre->window, TwmContext, &context_data) == 0)
        Tmp_win = (TwmWindow *) context_data;
    else
        Tmp_win = NULL;

    /*
     * According to the July 27, 1988 ICCCM draft, we should ignore size and
     * position fields in the WM_NORMAL_HINTS property when we map a window.
     * Instead, we'll read the current geometry.  Therefore, we should respond
     * to configuration requests for windows which have never been mapped.
     */
    if (!Tmp_win || Tmp_win->icon_w == cre->window) {
        unsigned long xwcm;

        xwcm = cre->value_mask &
            (CWX | CWY | CWWidth | CWHeight | CWBorderWidth);
        xwc.x = cre->x;
        xwc.y = cre->y;
        xwc.width = cre->width;
        xwc.height = cre->height;
        xwc.border_width = cre->border_width;
        XConfigureWindow(dpy, Event.xany.window, (unsigned) xwcm, &xwc);

        return;
    }

    if ((cre->value_mask & CWStackMode) && Tmp_win->stackmode) {
        TwmWindow *otherwin = NULL;

        if (cre->value_mask & CWSibling) {
            if (XFindContext(dpy, cre->above, TwmContext, &context_data) == 0)
                otherwin = (TwmWindow *) context_data;
        }

        xwc.sibling = (otherwin != NULL) ? otherwin->frame : cre->above;
        xwc.stack_mode = cre->detail;
        XConfigureWindow(dpy, Tmp_win->frame,
                         cre->value_mask & (CWSibling | CWStackMode), &xwc);
    }

    /* Don't modify frame_XXX fields before calling SetupWindow! */
    x = Tmp_win->frame_x;
    y = Tmp_win->frame_y;
    width = Tmp_win->frame_width;
    height = Tmp_win->frame_height;
    bw = Tmp_win->frame_bw;

    /*
     * Section 4.1.5 of the ICCCM states that the (x,y) coordinates in the
     * configure request are for the upper-left outer corner of the window.
     * This means that we need to adjust for the additional title height as
     * well as for any border width changes that we decide to allow.  The
     * current window gravity is to be used in computing the adjustments, just
     * as when initially locating the window.  Note that if we do decide to
     * allow border width changes, we will need to send the synthetic
     * ConfigureNotify event.
     */
    GetGravityOffsets(Tmp_win, &gravx, &gravy);

    if (cre->value_mask & CWBorderWidth) {
        int bwdelta = cre->border_width - Tmp_win->old_bw;      /* posit growth */

        if (bwdelta && Scr->ClientBorderWidth) {        /* if change allowed */
            x += gravx * bwdelta;       /* change default values only */
            y += gravy * bwdelta;       /* ditto */
            bw = cre->border_width;
            if (Tmp_win->title_height)
                height += bwdelta;
            x += (gravx < 0) ? bwdelta : -bwdelta;
            y += (gravy < 0) ? bwdelta : -bwdelta;
        }
        Tmp_win->old_bw = cre->border_width;    /* for restoring */
    }

    if (cre->value_mask & CWX) {        /* override even if border change */
        x = cre->x - bw;
    }
    if (cre->value_mask & CWY) {
        y = cre->y - ((gravy < 0) ? 0 : Tmp_win->title_height) - bw;
    }

    if (cre->value_mask & CWWidth) {
        width = cre->width;
    }
    if (cre->value_mask & CWHeight) {
        height = cre->height + Tmp_win->title_height;
    }

    if (width != Tmp_win->frame_width || height != Tmp_win->frame_height)
        Tmp_win->zoomed = ZOOM_NONE;

    /*
     * SetupWindow (x,y) are the location of the upper-left outer corner and
     * are passed directly to XMoveResizeWindow (frame).  The (width,height)
     * are the inner size of the frame.  The inner width is the same as the
     * requested client window width; the inner height is the same as the
     * requested client window height plus any title bar slop.
     */
    SetupWindow(Tmp_win, x, y, width, height, bw);
}

/**
 * shape notification event handler
 */
void
HandleShapeNotify(void)
{
    XShapeEvent *sev = (XShapeEvent *) & Event;

    if (Tmp_win == NULL)
        return;
    if (sev->kind != ShapeBounding)
        return;
    if (!Tmp_win->wShaped && sev->shaped) {
        XShapeCombineMask(dpy, Tmp_win->frame, ShapeClip, 0, 0, None, ShapeSet);
    }
    Tmp_win->wShaped = (short) sev->shaped;
    SetFrameShape(Tmp_win);
}

#ifdef HAVE_XRANDR
/**
 * xrandr screen configuration change-notification handler
 */
void
HandleScreenChangeNotify(void)
{
    XRRScreenChangeNotifyEvent *xev = (XRRScreenChangeNotifyEvent *) & Event;
    int scrnum;

    for (scrnum = 0; scrnum < NumScreens; scrnum++) {
        if (ScreenList[scrnum]->Root == xev->root) {
            ScreenList[scrnum]->MyDisplayWidth = xev->width;
            ScreenList[scrnum]->MyDisplayHeight = xev->height;
        }
    }

    XRRUpdateConfiguration(&Event);
}
#endif

/**
 * unknown event handler
 */
void
HandleUnknown(void)
{
#ifdef DEBUG_EVENTS
    fprintf(stderr, "type = %d\n", Event.type);
#endif
}

/**
 * checks to see if the window is a transient.
 *
 *  \return TRUE  if window is a transient
 *  \return FALSE if window is not a transient
 *
 *      \param w the window to check
 */
int
Transient(Window w, Window *propw)
{
    return (XGetTransientForHint(dpy, w, propw));
}

/**
 * get ScreenInfo struct associated with a given window
 *
 *  \return ScreenInfo struct
 *  \param  w the window
 */
ScreenInfo *
FindScreenInfo(Window w)
{
    XWindowAttributes attr;

    attr.screen = NULL;

    if (XGetWindowAttributes(dpy, w, &attr)) {
        int scrnum;

        for (scrnum = 0; scrnum < NumScreens; scrnum++) {
            if (ScreenList[scrnum] != NULL &&
                (ScreenOfDisplay(dpy, ScreenList[scrnum]->screen) ==
                 attr.screen))
                return ScreenList[scrnum];
        }
    }

    return NULL;
}

static void
flush_expose(Window w)
{
    XEvent dummy;

    /* SUPPRESS 530 */
    while (XCheckTypedWindowEvent(dpy, w, Expose, &dummy));
}

/**
 * install the colormaps for one twm window.
 *
 *  \param type  type of event that caused the installation
 *  \param tmp   for a subset of event types, the address of the
 *                window structure, whose colormaps are to be installed.
 */
void
InstallWindowColormaps(int type, TwmWindow *tmp)
{
    int i, j, n, number_cwins, state;
    ColormapWindow **cwins, *cwin, **maxcwin = NULL;
    TwmColormap *cmap;
    char *row, *scoreboard;

    switch (type) {
    case EnterNotify:
    case LeaveNotify:
    case DestroyNotify:
    default:
        /* Save the colormap to be loaded for when force loading of
         * root colormap(s) ends.
         */
        Scr->cmapInfo.pushed_window = tmp;
        /* Don't load any new colormap if root colormap(s) has been
         * force loaded.
         */
        if (Scr->cmapInfo.root_pushes)
            return;
        /* Don't reload the currend window colormap list.
         */
        if (Scr->cmapInfo.cmaps == &tmp->cmaps)
            return;
        if (Scr->cmapInfo.cmaps)
            for (i = Scr->cmapInfo.cmaps->number_cwins,
                 cwins = Scr->cmapInfo.cmaps->cwins; i-- > 0; cwins++)
                (*cwins)->colormap->state &= ~CM_INSTALLABLE;
        Scr->cmapInfo.cmaps = &tmp->cmaps;
        break;

    case PropertyNotify:
    case VisibilityNotify:
    case ColormapNotify:
        break;
    }

    number_cwins = Scr->cmapInfo.cmaps->number_cwins;
    cwins = Scr->cmapInfo.cmaps->cwins;
    scoreboard = Scr->cmapInfo.cmaps->scoreboard;

    ColortableThrashing = FALSE;        /* in case installation aborted */

    state = CM_INSTALLED;

    for (i = 0; i < number_cwins; i++) {
        cwin = cwins[i];
        cmap = cwin->colormap;
        cmap->state |= CM_INSTALLABLE;
        cmap->state &= ~CM_INSTALL;
        cmap->w = cwin->w;
    }
    for (i = n = 0; i < number_cwins; i++) {
        cwin = cwins[i];
        cmap = cwin->colormap;
        if (cwin->visibility != VisibilityFullyObscured &&
            n < Scr->cmapInfo.maxCmaps) {
            row = scoreboard + (i * (i - 1) / 2);
            for (j = 0; j < i; j++)
                if (row[j] && (cwins[j]->colormap->state & CM_INSTALL))
                    break;
            if (j != i)
                continue;
            n++;
            maxcwin = &cwins[i];
            state &= (cmap->state & CM_INSTALLED);
            cmap->state |= CM_INSTALL;
        }
    }

    Scr->cmapInfo.first_req = NextRequest(dpy);

    for (; n > 0 && maxcwin >= cwins; maxcwin--) {
        cmap = (*maxcwin)->colormap;
        if (cmap->state & CM_INSTALL) {
            cmap->state &= ~CM_INSTALL;
            if (!(state & CM_INSTALLED)) {
                cmap->install_req = NextRequest(dpy);
                XInstallColormap(dpy, cmap->c);
            }
            cmap->state |= CM_INSTALLED;
            n--;
        }
    }
}

/** \fn InstallRootColormap
 *  \fn UninstallRootColormap
 *
 * Force (un)loads root colormap(s)
 *
 *         These matching routines provide a mechanism to insure that
 *         the root colormap(s) is installed during operations like
 *         rubber banding or menu display that require colors from
 *         that colormap.  Calls may be nested arbitrarily deeply,
 *         as long as there is one UninstallRootColormap call per
 *         InstallRootColormap call.
 *
 *         The final UninstallRootColormap will cause the colormap list
 *         which would otherwise have be loaded to be loaded, unless
 *         Enter or Leave Notify events are queued, indicating some
 *         other colormap list would potentially be loaded anyway.
 */
void
InstallRootColormap(void)
{
    TwmWindow *tmp;

    if (Scr->cmapInfo.root_pushes == 0) {
        /*
         * The saving and restoring of cmapInfo.pushed_window here
         * is a slimy way to remember the actual pushed list and
         * not that of the root window.
         */
        tmp = Scr->cmapInfo.pushed_window;
        InstallWindowColormaps(0, &Scr->TwmRoot);
        Scr->cmapInfo.pushed_window = tmp;
    }
    Scr->cmapInfo.root_pushes++;
}

static Bool
UninstallRootColormapQScanner(Display *dpy2 _X_UNUSED, XEvent *ev, char *args)
{
    if (!*args) {
        if (ev->type == EnterNotify) {
            if (ev->xcrossing.mode != NotifyGrab)
                *args = 1;
        }
        else if (ev->type == LeaveNotify) {
            if (ev->xcrossing.mode == NotifyNormal)

                *args = 1;
        }
    }
    return (False);
}

void
UninstallRootColormap(void)
{
    char args;
    XEvent dummy;

    if (Scr->cmapInfo.root_pushes)
        Scr->cmapInfo.root_pushes--;

    if (!Scr->cmapInfo.root_pushes) {
        /*
         * If we have subsequent Enter or Leave Notify events,
         * we can skip the reload of pushed colormaps.
         */
        XSync(dpy, 0);
        args = 0;
        (void) XCheckIfEvent(dpy, &dummy, UninstallRootColormapQScanner, &args);

        if (!args)
            InstallWindowColormaps(0, Scr->cmapInfo.pushed_window);
    }
}

#ifdef TRACE
void
dumpevent(XEvent *e)
{
    char *name = NULL;

    switch (e->type) {
        /* *INDENT-OFF* */
        case KeyPress:            name = "KeyPress";         break;
        case KeyRelease:          name = "KeyRelease";       break;
        case ButtonPress:         name = "ButtonPress";      break;
        case ButtonRelease:       name = "ButtonRelease";    break;
        case MotionNotify:        name = "MotionNotify";     break;
        case EnterNotify:         name = "EnterNotify";      break;
        case LeaveNotify:         name = "LeaveNotify";      break;
        case FocusIn:             name = "FocusIn";          break;
        case FocusOut:            name = "FocusOut";         break;
        case KeymapNotify:        name = "KeymapNotify";     break;
        case Expose:              name = "Expose";           break;
        case GraphicsExpose:      name = "GraphicsExpose";   break;
        case NoExpose:            name = "NoExpose";         break;
        case VisibilityNotify:    name = "VisibilityNotify"; break;
        case CreateNotify:        name = "CreateNotify";     break;
        case DestroyNotify:       name = "DestroyNotify";    break;
        case UnmapNotify:         name = "UnmapNotify";      break;
        case MapNotify:           name = "MapNotify";        break;
        case MapRequest:          name = "MapRequest";       break;
        case ReparentNotify:      name = "ReparentNotify";   break;
        case ConfigureNotify:     name = "ConfigureNotify";  break;
        case ConfigureRequest:    name = "ConfigureRequest"; break;
        case GravityNotify:       name = "GravityNotify";    break;
        case ResizeRequest:       name = "ResizeRequest";    break;
        case CirculateNotify:     name = "CirculateNotify";  break;
        case CirculateRequest:    name = "CirculateRequest"; break;
        case PropertyNotify:      name = "PropertyNotify";   break;
        case SelectionClear:      name = "SelectionClear";   break;
        case SelectionRequest:    name = "SelectionRequest"; break;
        case SelectionNotify:     name = "SelectionNotify";  break;
        case ColormapNotify:      name = "ColormapNotify";   break;
        case ClientMessage:       name = "ClientMessage";    break;
        case MappingNotify:       name = "MappingNotify";    break;
        /* *INDENT-ON* */
    }

    if (name) {
        printf("event:  %s, %d remaining\n", name, QLength(dpy));
    }
    else {
        printf("unknown event %d, %d remaining\n", e->type, QLength(dpy));
    }
}
#endif                          /* TRACE */