Source

xemacs-beta / src / EmacsFrame.c

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/* The emacs frame widget.
   Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   Copyright (C) 1993-1995 Sun Microsystems, Inc.
   Copyright (C) 1995 Ben Wing.

This file is part of XEmacs.

XEmacs 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 2, or (at your option) any
later version.

XEmacs 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 XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: Not in FSF. */

/* #### Note to potential hackers: Don't mess with this unless you're
   sure you know what you're doing!  Xt is a lot more subtle than
   you may think. */

#include <config.h>
#include "lisp.h"

#include "console-x.h"
#include "glyphs-x.h"
#include "objects-x.h"
#include <X11/Shell.h>
#include "EmacsFrameP.h"
#include "EmacsManager.h"	/* for EmacsManagerChangeSize */
#include "xmu.h"

#include "faces.h"
#include "frame.h"
#include "toolbar.h"
#include "redisplay.h"
#include "window.h"

static void EmacsFrameClassInitialize (void);
static void EmacsFrameInitialize (Widget, Widget, ArgList, Cardinal *);
static void EmacsFrameRealize (Widget, XtValueMask*, XSetWindowAttributes*);
static void EmacsFrameResize (Widget widget);
static Boolean EmacsFrameSetValues (Widget, Widget, Widget,
				     ArgList, Cardinal *);
static XtGeometryResult EmacsFrameQueryGeometry (Widget, XtWidgetGeometry*,
						  XtWidgetGeometry*);

extern void
emacs_Xt_mapping_action (Widget w, XEvent* event);

#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},
  {XtNmenubar, XtCMenubar, XtRBoolean, sizeof (Boolean),
     offset (menubar_p), XtRImmediate, (XtPointer) True},
  {XtNinitiallyUnmapped, XtCInitiallyUnmapped, XtRBoolean, sizeof (Boolean),
     offset (initially_unmapped), XtRImmediate, (XtPointer) False},
  {XtNminibuffer, XtCMinibuffer, XtRBoolean, sizeof (Boolean),
     offset (minibuffer), XtRImmediate, (XtPointer) True},
  {XtNunsplittable, XtCUnsplittable, XtRBoolean, sizeof (Boolean),
     offset (unsplittable), XtRImmediate, (XtPointer) False},
  {XtNinternalBorderWidth, XtCInternalBorderWidth, XtRInt, sizeof (int),
     offset (internal_border_width), XtRImmediate, (XtPointer)4},
#ifdef HAVE_SCROLLBARS
  {XtNscrollBarWidth, XtCScrollBarWidth, XtRInt, sizeof (int),
     offset (scrollbar_width), XtRImmediate, (XtPointer)-1},
  {XtNscrollBarHeight, XtCScrollBarHeight, XtRInt, sizeof (int),
     offset (scrollbar_height), XtRImmediate, (XtPointer)-1},
  {XtNscrollBarPlacement, XtCScrollBarPlacement, XtRScrollBarPlacement,
      sizeof(unsigned char), offset(scrollbar_placement), XtRImmediate,
#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID) || \
    defined (LWLIB_SCROLLBARS_ATHENA3D)
      (XtPointer) XtBOTTOM_RIGHT
#else
      (XtPointer) XtBOTTOM_LEFT
#endif
  },
#endif /* HAVE_SCROLLBARS */
#ifdef HAVE_TOOLBARS
  {XtNtopToolBarHeight, XtCTopToolBarHeight, XtRInt, sizeof (int),
     offset (top_toolbar_height), XtRImmediate, (XtPointer)-1},
  {XtNbottomToolBarHeight, XtCBottomToolBarHeight, XtRInt, sizeof (int),
     offset (bottom_toolbar_height), XtRImmediate, (XtPointer)-1},
  {XtNleftToolBarWidth, XtCLeftToolBarWidth, XtRInt, sizeof (int),
     offset (left_toolbar_width), XtRImmediate, (XtPointer)-1},
  {XtNrightToolBarWidth, XtCRightToolBarWidth, XtRInt, sizeof (int),
     offset (right_toolbar_width), XtRImmediate, (XtPointer)-1},
  {XtNtopToolBarBorderWidth, XtCTopToolBarBorderWidth, XtRInt,
     sizeof (int),
     offset (top_toolbar_border_width), XtRImmediate, (XtPointer)-1},
  {XtNbottomToolBarBorderWidth, XtCBottomToolBarBorderWidth, XtRInt,
     sizeof (int),
     offset (bottom_toolbar_border_width), XtRImmediate, (XtPointer)-1},
  {XtNleftToolBarBorderWidth, XtCLeftToolBarBorderWidth, XtRInt,
     sizeof (int),
     offset (left_toolbar_border_width), XtRImmediate, (XtPointer)-1},
  {XtNrightToolBarBorderWidth, XtCRightToolBarBorderWidth, XtRInt,
     sizeof (int),
     offset (right_toolbar_border_width), XtRImmediate, (XtPointer)-1},
  {XtNtopToolBarShadowColor, XtCTopToolBarShadowColor, XtRPixel, sizeof(Pixel),
     offset(top_toolbar_shadow_pixel), XtRString, "#000000"},
  {XtNbottomToolBarShadowColor, XtCBottomToolBarShadowColor, XtRPixel,
     sizeof(Pixel), offset(bottom_toolbar_shadow_pixel), XtRString, "#000000"},
  {XtNbackgroundToolBarColor, XtCBackgroundToolBarColor, XtRPixel,
     sizeof(Pixel), offset(background_toolbar_pixel), XtRString, "Gray75"},
  {XtNtopToolBarShadowPixmap, XtCTopToolBarShadowPixmap, XtRPixmap,
     sizeof (Pixmap), offset(top_toolbar_shadow_pixmap), XtRImmediate,
     (XtPointer)None},
  {XtNbottomToolBarShadowPixmap, XtCBottomToolBarShadowPixmap, XtRPixmap,
     sizeof (Pixmap), offset(bottom_toolbar_shadow_pixmap), XtRImmediate,
     (XtPointer)None},
  {XtNtoolBarShadowThickness, XtCToolBarShadowThickness, XtRDimension,
     sizeof (Dimension), offset (toolbar_shadow_thickness), XtRImmediate,
     (XtPointer)2},
#endif /* HAVE_TOOLBARS */
  {XtNinterline, XtCInterline, XtRInt, sizeof (int),
     offset (interline), XtRImmediate, (XtPointer)0},
  {
#ifdef I18N4
    XtNfontSet, XtCFontSet, XtRFontSet,    sizeof(XFontSet),
#else
    XtNfont,    XtCFont,    XtRFontStruct, sizeof(XFontStruct *),
#endif
    offset(font), XtRImmediate, (XtPointer)0
  },
  {XtNforeground, XtCForeground, XtRPixel, sizeof(Pixel),
     offset(foreground_pixel), XtRString, "XtDefaultForeground"},
  {XtNbackground, XtCBackground, XtRPixel, sizeof(Pixel),
     offset(background_pixel), XtRImmediate, (XtPointer)-1},
  {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},
  {XtNuseBackingStore, XtCUseBackingStore, XtRBoolean, sizeof (Boolean),
     offset (use_backing_store), XtRImmediate, (XtPointer)0},
  {XtNpreferredWidth, XtCPreferredWidth, XtRDimension, sizeof (Dimension),
     offset (preferred_width), XtRImmediate, (XtPointer)0},
  {XtNpreferredHeight, XtCPreferredHeight, XtRDimension, sizeof (Dimension),
     offset (preferred_height), XtRImmediate, (XtPointer)0},
};

#undef offset

/* Xt is stupid and dumb.
   Xt is stupid and dumb.
   Xt is stupid and dumb. */

static XtActionsRec
emacsFrameActionsTable [] = {
  {"mapping",  (XtActionProc) emacs_Xt_mapping_action},
};

static char
emacsFrameTranslations [] = "\
<Mapping>: mapping()\n\
";

/* If we're running under Motif, make this widget a subclass
   of XmPrimitive.  It's not clear this is necessary, but it
   may make focus behavior work better. */

EmacsFrameClassRec emacsFrameClassRec = {
    { /* core fields */
#ifdef LWLIB_USES_MOTIF
    /* superclass		*/	(WidgetClass) &xmPrimitiveClassRec,
#else
    /* superclass		*/	&widgetClassRec,
#endif
    /* class_name		*/	"EmacsFrame",
    /* widget_size		*/	sizeof(EmacsFrameRec),
    /* class_initialize		*/	EmacsFrameClassInitialize,
    /* class_part_initialize	*/	0,
    /* class_inited		*/	FALSE,
    /* initialize		*/	EmacsFrameInitialize,
    /* initialize_hook		*/	0,
    /* realize			*/	EmacsFrameRealize,
    /* actions			*/	emacsFrameActionsTable,
    /* num_actions		*/	XtNumber (emacsFrameActionsTable),
    /* resources		*/	resources,
    /* resource_count		*/	XtNumber(resources),
    /* xrm_class		*/	NULLQUARK,
    /* compress_motion		*/	TRUE,
    /* compress_exposure	*/	TRUE,
    /* compress_enterleave	*/	TRUE,
    /* visible_interest		*/	FALSE,
    /* destroy			*/	NULL,
    /* 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			*/	emacsFrameTranslations,
    /* query_geometry		*/	EmacsFrameQueryGeometry,
    /* display_accelerator	*/	XtInheritDisplayAccelerator,
    /* extension		*/	0
    },
#ifdef LWLIB_USES_MOTIF
    {	/* XmPrimitiveClassPart
	 */
      (XtWidgetProc) _XtInherit,	/* border_highlight */
      (XtWidgetProc) _XtInherit,	/* border_unhighlight */
      /* Setting the following to NULL causes PrimitiveInitialize()
	 not to add traversal (TAB etc. to switch focus) and
	 focus-in/out (border highlight/unhighlight) translations.
	 If you want those translations, use the value XtInheritTranslations
	 instead.  Doing this, however, will interfere with Emacs
	 focus handling (which highlights/unhighlights the text cursor),
	 and will lead to strange display results around the border of the
	 widget. */
      NULL,				/* translations */
      NULL,				/* arm_and_activate */
      NULL,				/* get resources */
      0,				/* num get_resources */
      NULL,				/* extension */
    },
#endif /* LWLIB_USES_MOTIF */
    {
      0
    }
};
WidgetClass emacsFrameClass = (WidgetClass) &emacsFrameClassRec;

static void
update_various_frame_slots (EmacsFrame ew)
{
  ew->emacs_frame.frame->pixheight = ew->core.height;
  ew->emacs_frame.frame->pixwidth = ew->core.width;
  ew->emacs_frame.frame->internal_border_width =
    ew->emacs_frame.internal_border_width;
}

static void
EmacsFrameInitialize (Widget request, Widget new,
		       ArgList dum1, Cardinal *dum2)
{
  EmacsFrame ew = (EmacsFrame)new;
  struct frame *f = ew->emacs_frame.frame;

  if (!f)
    fatal ("can't create an emacs frame widget without a frame.");
}

void emacs_Xt_event_handler (Widget wid /* unused */,
			     XtPointer closure /* unused */,
			     XEvent *event,
			     Boolean *continue_to_dispatch /* unused */);

static void
EmacsFrameRealize (Widget widget, XtValueMask *mask,
		   XSetWindowAttributes *attrs)
{
  EmacsFrame ew = (EmacsFrame) widget;
  struct frame *f = ew->emacs_frame.frame;
  Widget shell_widget = FRAME_X_SHELL_WIDGET (f);

  attrs->event_mask =
    ExposureMask           |
    VisibilityChangeMask   |
    PropertyChangeMask     |
    StructureNotifyMask    |
    SubstructureNotifyMask |
    /*SubstructureRedirectMask |*/ /* Only for WMs! */
    KeyPressMask           |
    KeyReleaseMask         |
    ButtonPressMask        |
    ButtonReleaseMask      |
    FocusChangeMask        |
    PointerMotionHintMask  |
    PointerMotionMask      |
    LeaveWindowMask        |
    EnterWindowMask;


#ifdef I18N4
  /* Make sure that events wanted by the input method are selected. */
  attrs->event_mask |= input_method_event_mask;
#endif

  *mask |= CWEventMask;

  if (ew->emacs_frame.use_backing_store)
    {
      attrs->backing_store = Always;
      *mask |= CWBackingStore;
    }
  XtCreateWindow (widget, InputOutput, (Visual *)CopyFromParent, *mask,
		  attrs);

  /* snarf the events we want. */
  XtInsertEventHandler (widget, attrs->event_mask, TRUE,
			emacs_Xt_event_handler, NULL, XtListHead);
  /* some events (e.g. map-notify and WM_DELETE_WINDOW) get sent
     directly to the shell, and the above event handler won't see
     them.  So add a handler to get them.  These events don't
     propagate, so there's no danger of them being seen twice. */
  XtInsertEventHandler (shell_widget,
			EnterWindowMask | LeaveWindowMask |
			VisibilityChangeMask | StructureNotifyMask |
			KeyPressMask,
			TRUE, emacs_Xt_event_handler, NULL, XtListHead);

#ifdef EXTERNAL_WIDGET
  /* #### Not sure if this special case is necessary */
  if (!FRAME_X_EXTERNAL_WINDOW_P (f))
#endif
    /* This is necessary under Motif in order to make it possible to click in
       a buffer and move focus out of a dialog box or control panel and back
       into emacs-land; also necessary so that you can still type chars
       if the cursor is over the menubar or scrollbar. */
    lw_set_keyboard_focus (shell_widget, FRAME_X_TEXT_WIDGET (f));
}

/* DO NOT CALL THIS FUNCTION!  Only Xt is supposed to do this. */

static void
EmacsFrameResize (Widget widget)
{
  EmacsFrame ew = (EmacsFrame)widget;
  struct frame *f = ew->emacs_frame.frame;
  int columns;
  int rows;
  XtWidgetGeometry req, repl;

  pixel_to_char_size (f, ew->core.width, ew->core.height, &columns, &rows);
  update_various_frame_slots (ew);
  change_frame_size (f, rows, columns, 0);

  /* Now we tell the EmacsShell that we've changed the size of the non-fixed
     portion of the frame.  Note that, if we the resize occurred as a result
     of EmacsFrameSetCharSize(), this information will be stored twice.
     This is not a big deal, as storing this information doesn't actually
     do anything until the next resize. */
  if (FRAME_X_TOP_LEVEL_FRAME_P (f))
    x_wm_set_variable_size (FRAME_X_SHELL_WIDGET (f), columns, rows);

  /* Kick the manager so that it knows we've changed size. */
  req.request_mode = 0;
  XtQueryGeometry (FRAME_X_CONTAINER_WIDGET (f), &req, &repl);
  EmacsManagerChangeSize (FRAME_X_CONTAINER_WIDGET (f), repl.width,
			  repl.height);
}

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;
  Lisp_Object frame = Qnil;

  XSETFRAME (frame, new->emacs_frame.frame);
  in_resource_setting++;
  /* This function does not need to do much.  Pretty much everything
     interesting will get done in the resize method, which will
     (if necessary) get called by Xt when this function returns
     (see below).
   */

  /* #### This function will not work if it is not called from
     update_EmacsFrame(), called from SET_FACE_PROPERTY().
     The code located there should be moved inside of here instead,
     so that things work if either SET_FACE_PROPERTY() is
     called or XtSetValues() is called.
     */

  if (cur->emacs_frame.iconic != new->emacs_frame.iconic &&
      FRAME_X_TOP_LEVEL_FRAME_P (new->emacs_frame.frame))
    x_wm_set_shell_iconic_p (FRAME_X_SHELL_WIDGET (new->emacs_frame.frame),
			     new->emacs_frame.iconic);

  if (!in_specifier_change_function)
    {
      /* If we got here, then we were likely called as a result of
	 the EditRes protocol, so go ahead and change scrollbar-width
	 and scrollbar-height.  Otherwise, we're merely mirroring
	 a change made to scrollbar-width etc. so don't do anything
	 special. */
#ifdef HAVE_SCROLLBARS
      if (cur->emacs_frame.scrollbar_width !=
	  new->emacs_frame.scrollbar_width)
	Fadd_spec_to_specifier
	  (Vscrollbar_width,
	   make_int (new->emacs_frame.scrollbar_width),
	   frame, Qnil, Qnil);
      if (cur->emacs_frame.scrollbar_height !=
	  new->emacs_frame.scrollbar_height)
	Fadd_spec_to_specifier
	  (Vscrollbar_height,
	   make_int (new->emacs_frame.scrollbar_height),
	   frame, Qnil, Qnil);
#endif /* HAVE_SCROLLBARS */
#ifdef HAVE_TOOLBARS
      if (cur->emacs_frame.top_toolbar_height !=
	  new->emacs_frame.top_toolbar_height)
	Fadd_spec_to_specifier
	  (Vtoolbar_size[TOP_TOOLBAR],
	   make_int (new->emacs_frame.top_toolbar_height),
	   frame, Qnil, Qnil);
      if (cur->emacs_frame.bottom_toolbar_height !=
	  new->emacs_frame.bottom_toolbar_height)
	Fadd_spec_to_specifier
	  (Vtoolbar_size[BOTTOM_TOOLBAR],
	   make_int (new->emacs_frame.bottom_toolbar_height),
	   frame, Qnil, Qnil);
      if (cur->emacs_frame.left_toolbar_width !=
	  new->emacs_frame.left_toolbar_width)
	Fadd_spec_to_specifier
	  (Vtoolbar_size[LEFT_TOOLBAR],
	   make_int (new->emacs_frame.left_toolbar_width),
	   frame, Qnil, Qnil);
      if (cur->emacs_frame.right_toolbar_width !=
	  new->emacs_frame.right_toolbar_width)
	Fadd_spec_to_specifier
	  (Vtoolbar_size[RIGHT_TOOLBAR],
	   make_int (new->emacs_frame.right_toolbar_width),
	   frame, Qnil, Qnil);
      if (cur->emacs_frame.top_toolbar_border_width !=
	  new->emacs_frame.top_toolbar_border_width)
	Fadd_spec_to_specifier
	  (Vtoolbar_border_width[TOP_TOOLBAR],
	   make_int (new->emacs_frame.top_toolbar_border_width),
	   frame, Qnil, Qnil);
      if (cur->emacs_frame.bottom_toolbar_border_width !=
	  new->emacs_frame.bottom_toolbar_border_width)
	Fadd_spec_to_specifier
	  (Vtoolbar_border_width[BOTTOM_TOOLBAR],
	   make_int (new->emacs_frame.bottom_toolbar_border_width),
	   frame, Qnil, Qnil);
      if (cur->emacs_frame.left_toolbar_border_width !=
	  new->emacs_frame.left_toolbar_border_width)
	Fadd_spec_to_specifier
	  (Vtoolbar_border_width[LEFT_TOOLBAR],
	   make_int (new->emacs_frame.left_toolbar_border_width),
	   frame, Qnil, Qnil);
      if (cur->emacs_frame.right_toolbar_border_width !=
	  new->emacs_frame.right_toolbar_border_width)
	Fadd_spec_to_specifier
	  (Vtoolbar_border_width[RIGHT_TOOLBAR],
	   make_int (new->emacs_frame.right_toolbar_border_width),
	   frame, Qnil, Qnil);
#endif /* HAVE_TOOLBARS */
    }
  in_resource_setting--;

  return False;

  /* Note that if either (a) we return True, or (b) the width or
     height has changed, an Expose event will be generated.  The Xt
     manual says you should not return True if the width or height has
     changed, because then two Expose events will be generated.

     In any case, there is no need to return True because
     SET_FACE_PROPERTY(), which does the resource
     setting, automatically forces a redisplay as necessary. */
}

static XtGeometryResult
EmacsFrameQueryGeometry (Widget widget, XtWidgetGeometry *request,
			 XtWidgetGeometry *result)
{
  EmacsFrame ew = (EmacsFrame) widget;
  int mask = request->request_mode;
  Dimension width, height;
  int ok_width_int, ok_height_int;
  Dimension ok_width, ok_height;

  /* We have a definite preference for what size we would like
     to be.

     1) If a preferred size was specified for us, use it.
        (This is not currently used)
     2) If a proposed size was given, round it to the nearest
        multiple of the default char size and return it.
     3) Otherwise, take our current size and round it to the
        nearest multiple of the default char size. */

  width = mask & CWWidth ? request->width : ew->core.width;
  height = mask & CWHeight ? request->height : ew->core.height;
  round_size_to_char (ew->emacs_frame.frame, width, height,
		      &ok_width_int, &ok_height_int);
  ok_width = (Dimension) ok_width_int;
  ok_height = (Dimension) ok_height_int;
  if (ew->emacs_frame.preferred_width)
    ok_width = ew->emacs_frame.preferred_width;
  if (ew->emacs_frame.preferred_height)
    ok_height = ew->emacs_frame.preferred_height;
  result->request_mode |= CWWidth | CWHeight;
  result->width = ok_width;
  result->height = ok_height;
  if (((mask & CWWidth) && ok_width != request->width)
      || ((mask & CWHeight) && ok_height != request->height))
    return XtGeometryAlmost;
  else
    return XtGeometryYes;
}

/* Xt string-to-scrollbar-placement converter */
/* ### Convert this to a `new-style' converter (See XtAddTypeConverter) */

/* This variable cannot be a stack variable. */
static unsigned char cvt_string_scrollbar_placement;

/* ARGSUSED */
static void
Xt_StringToScrollBarPlacement (XrmValuePtr args,   /* unused */
				 Cardinal *num_args, /* unused */
				 XrmValuePtr fromVal,
				 XrmValuePtr toVal)
{
  XrmQuark q;
  char *lowerName = (char *) alloca (strlen ((char *) fromVal->addr) + 1);

  XmuCopyISOLatin1Lowered (lowerName, (char *) fromVal->addr);
  q = XrmStringToQuark (lowerName);

  toVal->size = sizeof (cvt_string_scrollbar_placement);
  toVal->addr = (XPointer) &cvt_string_scrollbar_placement;

  if      (q == XrmStringToQuark ("top_left"))
    cvt_string_scrollbar_placement = XtTOP_LEFT;
  else if (q == XrmStringToQuark ("bottom_left"))
    cvt_string_scrollbar_placement = XtBOTTOM_LEFT;
  else if (q == XrmStringToQuark ("top_right"))
    cvt_string_scrollbar_placement = XtTOP_RIGHT;
  else if (q == XrmStringToQuark ("bottom_right"))
    cvt_string_scrollbar_placement = XtBOTTOM_RIGHT;
  else
    {
      XtStringConversionWarning (fromVal->addr, "scrollBarPlacement");
      toVal->addr = NULL;
      toVal->size = 0;
    }
}

static void
EmacsFrameClassInitialize (void)
{
  XtAddConverter (XtRString, XtRScrollBarPlacement,
		  Xt_StringToScrollBarPlacement, NULL, 0);
}

/********************* Special entrypoints *******************/

void
EmacsFrameRecomputeCellSize (Widget w)
{
  EmacsFrame ew = (EmacsFrame) w;
  int cw, ch;
  struct frame *f = ew->emacs_frame.frame;

  if (! XtIsSubclass (w, emacsFrameClass))
    abort ();

  default_face_height_and_width (make_frame (f), &ch, &cw);
  if (FRAME_X_TOP_LEVEL_FRAME_P (f))
    x_wm_set_cell_size (FRAME_X_SHELL_WIDGET (f), cw, ch);
}

/* Set the size of the widget to have the number of rows and columns
   specified.  This both causes the X window to change and the
   internal frame structures to get modified to match. */

void
EmacsFrameSetCharSize (Widget widget, int columns, int rows)
{
  EmacsFrame ew = (EmacsFrame) widget;
  int pixel_width, pixel_height;
  struct frame *f = ew->emacs_frame.frame;
  Arg al [2];

  if (columns < 3)
    columns = 3;  /* no way buddy */
  if (rows < 1)
    rows = 1;

  char_to_pixel_size (f, columns, rows, &pixel_width, &pixel_height);

  if (FRAME_X_TOP_LEVEL_FRAME_P (f))
    x_wm_set_variable_size (FRAME_X_SHELL_WIDGET (f), columns, rows);

  XtSetArg (al [0], XtNwidth,  (Dimension) pixel_width);
  XtSetArg (al [1], XtNheight, (Dimension) pixel_height);
  XtSetValues ((Widget) ew, al, 2);
}
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