Some more fixes for pixelwise resizing.

[gnu-emacs] / src / widget.c

/* The emacs frame widget.
   Copyright (C) 1992-1993, 2000-2013 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

/* Emacs 19 face widget ported by Fred Pierresteguy */

/* This file has been censored by the Communications Decency Act.
   That law was passed under the guise of a ban on pornography, but
   it bans far more than that.  This file did not contain pornography,
   but it was censored nonetheless.

   For information on US government censorship of the Internet, and
   what you can do to bring back freedom of the press, see the web
   site http://www.vtw.org/
   */

#include <config.h>
#include <stdio.h>

#include "lisp.h"
#include "xterm.h"

#include "keyboard.h"
#include "frame.h"
#include "window.h"

#include "dispextern.h"
#include "blockinput.h"

#include <X11/StringDefs.h>
#include <X11/IntrinsicP.h>
#include <X11/cursorfont.h>
#include "widgetprv.h"
#include <X11/ObjectP.h>
#include <X11/Shell.h>
#include <X11/ShellP.h>
#include "../lwlib/lwlib.h"

#include "character.h"
#include "font.h"

/* This sucks: this is the first default that x-faces.el tries.  This won't
   be used unless neither the "Emacs.EmacsFrame" resource nor the
   "Emacs.EmacsFrame" resource is set; the frame
   may have the wrong default size if this font doesn't exist, but some other
   font that x-faces.el does.  The workaround is to specify some font in the
   resource database; I don't know a solution other than duplicating the font-
   searching code from x-faces.el in this file.

   This also means that if "Emacs.EmacsFrame" is specified as a non-
   existent font, then Xt is going to substitute "XtDefaultFont" for it,
   which is a different size than this one.  The solution for this is to
   make x-faces.el try to use XtDefaultFont.  The problem with that is that
   XtDefaultFont is almost certainly variable-width.

   #### Perhaps we could have this code explicitly set XtDefaultFont to this?
 */
#define DEFAULT_FACE_FONT "-*-courier-medium-r-*-*-*-120-*-*-*-*-iso8859-*"


static void EmacsFrameInitialize (Widget request, Widget new, ArgList dum1, Cardinal *dum2);
static void EmacsFrameDestroy (Widget widget);
static void EmacsFrameRealize (Widget widget, XtValueMask *mask, XSetWindowAttributes *attrs);
static void EmacsFrameResize (Widget widget);
static Boolean EmacsFrameSetValues (Widget cur_widget, Widget req_widget, Widget new_widget, ArgList dum1, Cardinal *dum2);
static XtGeometryResult EmacsFrameQueryGeometry (Widget widget, XtWidgetGeometry *request, XtWidgetGeometry *result);


#undef XtOffset
#define XtOffset(p_type,field) \
        ((Cardinal) (((char *) (&(((p_type)0)->field))) - ((char *)0)))
#define offset(field) XtOffset (EmacsFrame, emacs_frame.field)

static XtResource resources[] = {
  {XtNgeometry, XtCGeometry, XtRString, sizeof (String),
     offset (geometry), XtRString, (XtPointer) 0},
  {XtNiconic, XtCIconic, XtRBoolean, sizeof (Boolean),
     offset (iconic), XtRImmediate, (XtPointer) False},

  {XtNemacsFrame, XtCEmacsFrame, XtRPointer, sizeof (XtPointer),
     offset (frame), XtRImmediate, 0},

  {XtNminibuffer, XtCMinibuffer, XtRInt, sizeof (int),
     offset (minibuffer), XtRImmediate, (XtPointer)0},
  {XtNunsplittable, XtCUnsplittable, XtRBoolean, sizeof (Boolean),
     offset (unsplittable), XtRImmediate, (XtPointer)0},
  {XtNinternalBorderWidth, XtCInternalBorderWidth, XtRInt, sizeof (int),
     offset (internal_border_width), XtRImmediate, (XtPointer)4},
  {XtNinterline, XtCInterline, XtRInt, sizeof (int),
     offset (interline), XtRImmediate, (XtPointer)0},
  {XtNfont,  XtCFont, XtRFontStruct, sizeof (struct font *),
     offset (font),XtRString, DEFAULT_FACE_FONT},
  {XtNforeground, XtCForeground, XtRPixel, sizeof (Pixel),
     offset (foreground_pixel), XtRString, "XtDefaultForeground"},
  {XtNcursorColor, XtCForeground, XtRPixel, sizeof (Pixel),
     offset (cursor_color), XtRString, "XtDefaultForeground"},
  {XtNbarCursor, XtCBarCursor, XtRBoolean, sizeof (Boolean),
     offset (bar_cursor), XtRImmediate, (XtPointer)0},
  {XtNvisualBell, XtCVisualBell, XtRBoolean, sizeof (Boolean),
     offset (visual_bell), XtRImmediate, (XtPointer)0},
  {XtNbellVolume, XtCBellVolume, XtRInt, sizeof (int),
     offset (bell_volume), XtRImmediate, (XtPointer)0},
};

#undef offset

/*
static XtActionsRec
emacsFrameActionsTable [] = {
  {"keypress",  key_press},
  {"focus_in",  emacs_frame_focus_handler},
  {"focus_out", emacs_frame_focus_handler},
};

static char
emacsFrameTranslations [] = "\
<KeyPress>: keypress()\n\
<FocusIn>:  focus_in()\n\
<FocusOut>: focus_out()\n\
";
*/

static EmacsFrameClassRec emacsFrameClassRec = {
    { /* core fields */
    /* superclass               */      &widgetClassRec,
    /* class_name               */      "EmacsFrame",
    /* widget_size              */      sizeof (EmacsFrameRec),
    /* class_initialize         */      0,
    /* class_part_initialize    */      0,
    /* class_inited             */      FALSE,
    /* initialize               */      EmacsFrameInitialize,
    /* initialize_hook          */      0,
    /* realize                  */      EmacsFrameRealize,
    /* actions                  */      0, /*emacsFrameActionsTable*/
    /* num_actions              */      0, /*XtNumber (emacsFrameActionsTable)*/
    /* resources                */      resources,
    /* resource_count           */      XtNumber (resources),
    /* xrm_class                */      NULLQUARK,
    /* compress_motion          */      TRUE,
    /* compress_exposure        */      TRUE,
    /* compress_enterleave      */      TRUE,
    /* visible_interest         */      FALSE,
    /* destroy                  */      EmacsFrameDestroy,
    /* resize                   */      EmacsFrameResize,
    /* expose                   */      XtInheritExpose,
    /* set_values               */      EmacsFrameSetValues,
    /* set_values_hook          */      0,
    /* set_values_almost        */      XtInheritSetValuesAlmost,
    /* get_values_hook          */      0,
    /* accept_focus             */      XtInheritAcceptFocus,
    /* version                  */      XtVersion,
    /* callback_private         */      0,
    /* tm_table                 */      0, /*emacsFrameTranslations*/
    /* query_geometry           */      EmacsFrameQueryGeometry,
    /* display_accelerator      */      XtInheritDisplayAccelerator,
    /* extension                */      0
    }
};

WidgetClass emacsFrameClass = (WidgetClass) &emacsFrameClassRec;

static void
get_default_char_pixel_size (EmacsFrame ew, int *pixel_width, int *pixel_height)
{
  struct frame* f = ew->emacs_frame.frame;
  *pixel_width = FRAME_COLUMN_WIDTH (f);
  *pixel_height = FRAME_LINE_HEIGHT (f);
}

static void
pixel_to_char_size (EmacsFrame ew, Dimension pixel_width, Dimension pixel_height, int *char_width, int *char_height)
{
  struct frame* f = ew->emacs_frame.frame;
  *char_width = FRAME_PIXEL_WIDTH_TO_TEXT_COLS (f, (int) pixel_width);
  *char_height = FRAME_PIXEL_HEIGHT_TO_TEXT_LINES (f, (int) pixel_height);
}

static void
char_to_pixel_size (EmacsFrame ew, int char_width, int char_height, Dimension *pixel_width, Dimension *pixel_height)
{
  struct frame* f = ew->emacs_frame.frame;
  *pixel_width = FRAME_TEXT_COLS_TO_PIXEL_WIDTH (f, char_width);
  *pixel_height = FRAME_TEXT_LINES_TO_PIXEL_HEIGHT (f, char_height);
}

static void
round_size_to_char (EmacsFrame ew, Dimension in_width, Dimension in_height, Dimension *out_width, Dimension *out_height)
{
  int char_width;
  int char_height;
  pixel_to_char_size (ew, in_width, in_height, &char_width, &char_height);
  char_to_pixel_size (ew, char_width, char_height, out_width, out_height);
}

static Widget
get_wm_shell (Widget w)
{
  Widget wmshell;

  for (wmshell = XtParent (w);
       wmshell && !XtIsWMShell (wmshell);
       wmshell = XtParent (wmshell));

  return wmshell;
}

#if 0 /* Currently not used.  */

static void
mark_shell_size_user_specified (Widget wmshell)
{
  if (! XtIsWMShell (wmshell)) emacs_abort ();
  /* This is kind of sleazy, but I can't see how else to tell it to make it
     mark the WM_SIZE_HINTS size as user specified when appropriate. */
  ((WMShellWidget) wmshell)->wm.size_hints.flags |= USSize;
}

#endif


/* Can't have static frame locals because of some broken compilers.
   Normally, initializing a variable like this doesn't work in emacs,
   but it's ok in this file because it must come after lastfile (and
   thus have its data not go into text space) because Xt needs to
   write to initialized data objects too.
 */
#if 0
static Boolean first_frame_p = True;
#endif

static void
set_frame_size (EmacsFrame ew)
{
  /* The widget hierarchy is

        argv[0]                 emacsShell      pane    Frame-NAME
        ApplicationShell        EmacsShell      Paned   EmacsFrame

     We accept geometry specs in this order:

        *Frame-NAME.geometry
        *EmacsFrame.geometry
        Emacs.geometry

     Other possibilities for widget hierarchies might be

        argv[0]                 frame           pane    Frame-NAME
        ApplicationShell        EmacsShell      Paned   EmacsFrame
     or
        argv[0]                 Frame-NAME      pane    Frame-NAME
        ApplicationShell        EmacsShell      Paned   EmacsFrame
     or
        argv[0]                 Frame-NAME      pane    emacsTextPane
        ApplicationShell        EmacsFrame      Paned   EmacsTextPane

     With the current setup, the text-display-area is the part which is
     an emacs "frame", since that's the only part managed by emacs proper
     (the menubar and the parent of the menubar and all that sort of thing
     are managed by lwlib.)

     The EmacsShell widget is simply a replacement for the Shell widget
     which is able to deal with using an externally-supplied window instead
     of always creating its own.  It is not actually emacs specific, and
     should possibly have class "Shell" instead of "EmacsShell" to simplify
     the resources.

   */

  /* Hairily merged geometry */
  unsigned int w = FRAME_COLS (ew->emacs_frame.frame);
  unsigned int h = FRAME_LINES (ew->emacs_frame.frame);

  Widget wmshell = get_wm_shell ((Widget) ew);
  /* Each Emacs shell is now independent and top-level.  */

  if (! XtIsSubclass (wmshell, shellWidgetClass)) emacs_abort ();

  /* We don't need this for the moment. The geometry is computed in
     xfns.c.  */
#if 0
  /* If the EmacsFrame doesn't have a geometry but the shell does,
     treat that as the geometry of the frame.  (Is this bogus?
     I'm not sure.) */
  if (ew->emacs_frame.geometry == 0)
    XtVaGetValues (wmshell, XtNgeometry, &ew->emacs_frame.geometry, NULL);

  /* If the Shell is iconic, then the EmacsFrame is iconic.  (Is
     this bogus? I'm not sure.) */
  if (!ew->emacs_frame.iconic)
    XtVaGetValues (wmshell, XtNiconic, &ew->emacs_frame.iconic, NULL);


  {
    char *geom = 0;
    XtVaGetValues (app_shell, XtNgeometry, &geom, NULL);
    if (geom)
      app_flags = XParseGeometry (geom, &app_x, &app_y, &app_w, &app_h);
  }

  if (ew->emacs_frame.geometry)
    frame_flags = XParseGeometry (ew->emacs_frame.geometry,
                                   &frame_x, &frame_y,
                                   &frame_w, &frame_h);

  if (first_frame_p)
    {
      /* If this is the first frame created:
         ====================================

         - Use the ApplicationShell's size/position, if specified.
           (This is "Emacs.geometry", or the "-geometry" command line arg.)
         - Else use the EmacsFrame's size/position.
           (This is "*Frame-NAME.geometry")

         - If the AppShell is iconic, the frame should be iconic.

         AppShell comes first so that -geometry always applies to the first
         frame created, even if there is an "every frame" entry in the
         resource database.
       */
      if (app_flags & (XValue | YValue))
        {
          x = app_x; y = app_y;
          flags |= (app_flags & (XValue | YValue | XNegative | YNegative));
        }
      else if (frame_flags & (XValue | YValue))
        {
          x = frame_x; y = frame_y;
          flags |= (frame_flags & (XValue | YValue | XNegative | YNegative));
        }

      if (app_flags & (WidthValue | HeightValue))
        {
          w = app_w; h = app_h;
          flags |= (app_flags & (WidthValue | HeightValue));
        }
      else if (frame_flags & (WidthValue | HeightValue))
        {
          w = frame_w; h = frame_h;
          flags |= (frame_flags & (WidthValue | HeightValue));
        }

      /* If the AppShell is iconic, then the EmacsFrame is iconic. */
      if (!ew->emacs_frame.iconic)
        XtVaGetValues (app_shell, XtNiconic, &ew->emacs_frame.iconic, NULL);

      first_frame_p = False;
    }
  else
    {
      /* If this is not the first frame created:
         ========================================

         - use the EmacsFrame's size/position if specified
         - Otherwise, use the ApplicationShell's size, but not position.

         So that means that one can specify the position of the first frame
         with "Emacs.geometry" or `-geometry'; but can only specify the
         position of subsequent frames with "*Frame-NAME.geometry".

         AppShell comes second so that -geometry does not apply to subsequent
         frames when there is an "every frame" entry in the resource db,
         but does apply to the first frame.
       */
      if (frame_flags & (XValue | YValue))
        {
          x = frame_x; y = frame_y;
          flags |= (frame_flags & (XValue | YValue | XNegative | YNegative));
        }

      if (frame_flags & (WidthValue | HeightValue))
        {
          w = frame_w; h = frame_h;
          flags |= (frame_flags & (WidthValue | HeightValue));
        }
      else if (app_flags & (WidthValue | HeightValue))
        {
          w = app_w;
          h = app_h;
          flags |= (app_flags & (WidthValue | HeightValue));
        }
    }
#endif /* 0 */
  {
    struct frame *f = ew->emacs_frame.frame;
    Dimension pixel_width, pixel_height;

    /* Take into account the size of the scrollbar.  Always use the
       number of columns occupied by the scroll bar here otherwise we
       might end up with a frame width that is not a multiple of the
       frame's character width which is bad for vertically split
       windows.  */

    compute_fringe_widths (f, 0);

#if 0 /* This can run Lisp code, and it is dangerous to give
         out the frame to Lisp code before it officially exists.
         This is handled in Fx_create_frame so not needed here.  */
    change_frame_size (f, w, h, 1, 0, 0, 0);
#endif
    char_to_pixel_size (ew, w, h, &pixel_width, &pixel_height);
    ew->core.width = pixel_width;
    ew->core.height = pixel_height;

#if 0 /* xfns.c takes care of this now.  */
    /* If a position was specified, assign it to the shell widget.
       (Else WM won't do anything with it.)
     */
    if (flags & (XValue | YValue))
      {
        /* the tricky things with the sign is to make sure that
           -0 is printed -0. */
        sprintf (shell_position, "=%c%d%c%d",
                 flags & XNegative ? '-' : '+', x < 0 ? -x : x,
                 flags & YNegative ? '-' : '+', y < 0 ? -y : y);
        XtVaSetValues (wmshell, XtNgeometry, xstrdup (shell_position), NULL);
      }
    else if (flags & (WidthValue | HeightValue))
      {
        sprintf (shell_position, "=%dx%d", pixel_width, pixel_height);
        XtVaSetValues (wmshell, XtNgeometry, xstrdup (shell_position), NULL);
      }

    /* If the geometry spec we're using has W/H components, mark the size
       in the WM_SIZE_HINTS as user specified. */
    if (flags & (WidthValue | HeightValue))
      mark_shell_size_user_specified (wmshell);

    /* Also assign the iconic status of the frame to the Shell, so that
       the WM sees it. */
    XtVaSetValues (wmshell, XtNiconic, ew->emacs_frame.iconic, NULL);
#endif /* 0 */
  }
}

static void
update_wm_hints (EmacsFrame ew)
{
  Widget wmshell = get_wm_shell ((Widget)ew);
  int cw;
  int ch;
  Dimension rounded_width;
  Dimension rounded_height;
  int char_width;
  int char_height;
  int base_width;
  int base_height;
  int min_rows = 0, min_cols = 0;

  /* This happens when the frame is just created.  */
  if (! wmshell) return;

#if 0
  check_frame_size (ew->emacs_frame.frame, &min_cols, &min_rows, 0);
#endif

  pixel_to_char_size (ew, ew->core.width, ew->core.height,
                      &char_width, &char_height);
  char_to_pixel_size (ew, char_width, char_height,
                      &rounded_width, &rounded_height);
  get_default_char_pixel_size (ew, &cw, &ch);

  base_width = (wmshell->core.width - ew->core.width
                + (rounded_width - (char_width * cw)));
  base_height = (wmshell->core.height - ew->core.height
                + (rounded_height - (char_height * ch)));

  /* This is kind of sleazy, but I can't see how else to tell it to
     make it mark the WM_SIZE_HINTS size as user specified.
   */
/*  ((WMShellWidget) wmshell)->wm.size_hints.flags |= USSize;*/

  XtVaSetValues (wmshell,
                 XtNbaseWidth, (XtArgVal) base_width,
                 XtNbaseHeight, (XtArgVal) base_height,
                 XtNwidthInc, (XtArgVal) cw,
                 XtNheightInc, (XtArgVal) ch,
                 XtNminWidth, (XtArgVal) (base_width + min_cols * cw),
                 XtNminHeight, (XtArgVal) (base_height + min_rows * ch),
                 NULL);
}

void
widget_update_wm_size_hints (Widget widget)
{
  EmacsFrame ew = (EmacsFrame)widget;
  update_wm_hints (ew);
}

static char setup_frame_cursor_bits[] =
{
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

static void
setup_frame_gcs (EmacsFrame ew)
{
  XGCValues gc_values;
  struct frame* s = ew->emacs_frame.frame;
  Pixmap blank_stipple, blank_tile;
  unsigned long valuemask = (GCForeground | GCBackground | GCGraphicsExposures
                             | GCStipple | GCTile);
  Lisp_Object font;

  XSETFONT (font, ew->emacs_frame.font);
  font = Ffont_xlfd_name (font, Qnil);
  if (STRINGP (font))
    {
      XFontStruct *xfont = XLoadQueryFont (FRAME_DISPLAY_INFO (s)->display,
                                           SSDATA (font));
      if (xfont)
        {
          gc_values.font = xfont->fid;
          valuemask |= GCFont;
        }
    }

  /* We have to initialize all of our GCs to have a stipple/tile, otherwise
     XGetGCValues returns uninitialized data when we query the stipple
     (instead of None or something sensible) and it makes things hard.

     This should be fixed for real by not querying the GCs but instead having
     some GC-based cache instead of the current face-based cache which doesn't
     effectively cache all of the GC settings we need to use.
   */

  blank_stipple
    = XCreateBitmapFromData (XtDisplay (ew),
                             RootWindowOfScreen (XtScreen (ew)),
                             setup_frame_cursor_bits, 2, 2);

  /* use fg = 0, bg = 1 below, but it's irrelevant since this pixmap should
     never actually get used as a background tile!
   */
  blank_tile
    = XCreatePixmapFromBitmapData (XtDisplay (ew),
                                   RootWindowOfScreen (XtScreen (ew)),
                                   setup_frame_cursor_bits, 2, 2,
                                   0, 1, ew->core.depth);

  /* Normal video */
  gc_values.foreground = ew->emacs_frame.foreground_pixel;
  gc_values.background = ew->core.background_pixel;
  gc_values.graphics_exposures = False;
  gc_values.stipple = blank_stipple;
  gc_values.tile = blank_tile;
  XChangeGC (XtDisplay (ew), s->output_data.x->normal_gc,
             valuemask, &gc_values);

  /* Reverse video style. */
  gc_values.foreground = ew->core.background_pixel;
  gc_values.background = ew->emacs_frame.foreground_pixel;
  gc_values.graphics_exposures = False;
  gc_values.stipple = blank_stipple;
  gc_values.tile = blank_tile;
  XChangeGC (XtDisplay (ew), s->output_data.x->reverse_gc,
             valuemask, &gc_values);

  /* Cursor has to have an empty stipple. */
  gc_values.foreground = ew->core.background_pixel;
  gc_values.background = ew->emacs_frame.cursor_color;
  gc_values.graphics_exposures = False;
  gc_values.tile = blank_tile;
  gc_values.stipple
    = XCreateBitmapFromData (XtDisplay (ew),
                             RootWindowOfScreen (XtScreen (ew)),
                             setup_frame_cursor_bits, 16, 16);
  XChangeGC (XtDisplay (ew), s->output_data.x->cursor_gc,
             valuemask, &gc_values);
}

static void
update_various_frame_slots (EmacsFrame ew)
{
  struct frame *f = ew->emacs_frame.frame;
  struct x_output *x = f->output_data.x;
  FRAME_PIXEL_HEIGHT (f) = ew->core.height + x->menubar_height;
  FRAME_PIXEL_WIDTH (f) = ew->core.width;
  f->internal_border_width = ew->emacs_frame.internal_border_width;

}

static void
update_from_various_frame_slots (EmacsFrame ew)
{
  struct frame *f = ew->emacs_frame.frame;
  struct x_output *x = f->output_data.x;
  ew->core.height = FRAME_PIXEL_HEIGHT (f) - x->menubar_height;
  ew->core.width = FRAME_PIXEL_WIDTH (f);
  ew->core.background_pixel = FRAME_BACKGROUND_PIXEL (f);
  ew->emacs_frame.internal_border_width = f->internal_border_width;
  ew->emacs_frame.font = x->font;
  ew->emacs_frame.foreground_pixel = FRAME_FOREGROUND_PIXEL (f);
  ew->emacs_frame.cursor_color = x->cursor_pixel;
  ew->core.border_pixel = x->border_pixel;
}

static void
EmacsFrameInitialize (Widget request, Widget new, ArgList dum1, Cardinal *dum2)
{
  EmacsFrame ew = (EmacsFrame)new;

  if (!ew->emacs_frame.frame)
    {
      fprintf (stderr,
               "can't create an emacs frame widget without a frame\n");
      exit (1);
    }

  update_from_various_frame_slots (ew);
  set_frame_size (ew);
}

static void
resize_cb (Widget widget,
           XtPointer closure,
           XEvent* event,
           Boolean* continue_to_dispatch)
{
  EmacsFrameResize (widget);
}


static void
EmacsFrameRealize (Widget widget, XtValueMask *mask, XSetWindowAttributes *attrs)
{
  EmacsFrame ew = (EmacsFrame)widget;

  /* This used to contain SubstructureRedirectMask, but this turns out
     to be a problem with XIM on Solaris, and events from that mask
     don't seem to be used.  Let's check that.  */
  attrs->event_mask = (STANDARD_EVENT_SET
                       | PropertyChangeMask
                       | SubstructureNotifyMask);
  *mask |= CWEventMask;
  XtCreateWindow (widget, InputOutput, (Visual *)CopyFromParent, *mask,
                  attrs);
  /* Some ConfigureNotify events does not end up in EmacsFrameResize so
     make sure we get them all.  Seen with xfcwm4 for example.  */
  XtAddRawEventHandler (widget, StructureNotifyMask, False, resize_cb, NULL);
  update_wm_hints (ew);
}

static void
EmacsFrameDestroy (Widget widget)
{
  /* All GCs are now freed in x_free_frame_resources.  */
}

static void
EmacsFrameResize (Widget widget)
{
  EmacsFrame ew = (EmacsFrame)widget;
  struct frame *f = ew->emacs_frame.frame;
  struct x_output *x = f->output_data.x;
  int columns;
  int rows;

  pixel_to_char_size (ew, ew->core.width, ew->core.height, &columns, &rows);
  if (columns != FRAME_COLS (f)
      || rows != FRAME_LINES (f)
      || ew->core.width != FRAME_PIXEL_WIDTH (f)
      || ew->core.height + x->menubar_height != FRAME_PIXEL_HEIGHT (f))
    {
      change_frame_size (f, columns, rows, 0, 1, 0, 0);
      update_wm_hints (ew);
      update_various_frame_slots (ew);

      cancel_mouse_face (f);
    }
}

static Boolean
EmacsFrameSetValues (Widget cur_widget, Widget req_widget, Widget new_widget, ArgList dum1, Cardinal *dum2)
{
  EmacsFrame cur = (EmacsFrame)cur_widget;
  EmacsFrame new = (EmacsFrame)new_widget;

  Boolean needs_a_refresh = False;
  Boolean has_to_recompute_size;
  Boolean has_to_recompute_gcs;
  Boolean has_to_update_hints;

  int char_width, char_height;
  Dimension pixel_width;
  Dimension pixel_height;

  /* AFAIK, this function is never called. -- Jan D, Oct 2009.  */
  has_to_recompute_gcs = (cur->emacs_frame.font != new->emacs_frame.font
                          || (cur->emacs_frame.foreground_pixel
                              != new->emacs_frame.foreground_pixel)
                          || (cur->core.background_pixel
                              != new->core.background_pixel)
                          );

  has_to_recompute_size = (cur->emacs_frame.font != new->emacs_frame.font
                           && cur->core.width == new->core.width
                           && cur->core.height == new->core.height);

  has_to_update_hints = (cur->emacs_frame.font != new->emacs_frame.font);

  if (has_to_recompute_gcs)
    {
      setup_frame_gcs (new);
      needs_a_refresh = True;
    }

  if (has_to_recompute_size)
    {
      pixel_width = new->core.width;
      pixel_height = new->core.height;
      pixel_to_char_size (new, pixel_width, pixel_height, &char_width,
                          &char_height);
      char_to_pixel_size (new, char_width, char_height, &pixel_width,
                          &pixel_height);
      new->core.width = pixel_width;
      new->core.height = pixel_height;

      change_frame_size (new->emacs_frame.frame, char_width, char_height,
                         1, 0, 0, 0);
      needs_a_refresh = True;
    }

  if (has_to_update_hints)
    update_wm_hints (new);

  update_various_frame_slots (new);

  /* #### This doesn't work, I haven't been able to find ANY kludge that
     will let (x-create-frame '((iconic . t))) work.  It seems that changes
     to wm_shell's iconic slot have no effect after it has been realized,
     and calling XIconifyWindow doesn't work either (even though the window
     has been created.)  Perhaps there is some property we could smash
     directly, but I'm sick of this for now.
   */
  if (cur->emacs_frame.iconic != new->emacs_frame.iconic)
    {
      Widget wmshell = get_wm_shell ((Widget) cur);
      XtVaSetValues (wmshell, XtNiconic,
                     (XtArgVal) new->emacs_frame.iconic, NULL);
    }

  return needs_a_refresh;
}

static XtGeometryResult
EmacsFrameQueryGeometry (Widget widget, XtWidgetGeometry *request, XtWidgetGeometry *result)
{
  EmacsFrame ew = (EmacsFrame)widget;

  int mask = request->request_mode;
  Dimension ok_width, ok_height;

  if (mask & (CWWidth | CWHeight))
    {
      round_size_to_char (ew,
                          (mask & CWWidth) ? request->width : ew->core.width,
                          ((mask & CWHeight) ? request->height
                           : ew->core.height),
                          &ok_width, &ok_height);
      if ((mask & CWWidth) && (ok_width != request->width))
        {
          result->request_mode |= CWWidth;
          result->width = ok_width;
        }
      if ((mask & CWHeight) && (ok_height != request->height))
        {
          result->request_mode |= CWHeight;
          result->height = ok_height;
        }
    }
  return result->request_mode ? XtGeometryAlmost : XtGeometryYes;
}

/* Special entry points */
void
EmacsFrameSetCharSize (Widget widget, int columns, int rows)
{
  EmacsFrame ew = (EmacsFrame) widget;
  struct frame *f = ew->emacs_frame.frame;

  x_set_window_size (f, 0, columns, rows, 0);
}

\f
void
widget_store_internal_border (Widget widget)
{
  EmacsFrame ew = (EmacsFrame) widget;
  struct frame *f = ew->emacs_frame.frame;

  ew->emacs_frame.internal_border_width = f->internal_border_width;
}