 /* Tabs Widget for XEmacs.
    Copyright (C) 1999 Edward A. Falk

 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.  */

 /*
 * Tabs.c - Index Tabs composite widget
 *
 * Author: Edward A. Falk
 *	   falk@falconer.vip.best.com
 *
 * Date: July 29, 1997
 *
 *
 * Overall layout of this widget is as follows:
 *
 *   ________ ,---------. _________
 *  |  label ||  Label  ||  Label  |  \ tabs
 *  |________||         ||_________|  /
 *  |+----------------------------+|  \
 *  ||                            ||  |
 *  ||  child widget window       ||   > frame
 *  |+----------------------------+|  |
 *  +------------------------------+  /
 *
 * The height of the tabs includes the shadow width, top and bottom
 * margins, and the height of the text.
 *
 * The height of the frame includes the top and bottom shadow width and the
 * size of the child widget window.
 *
 * The tabs overlap the frame and each other vertically by the shadow
 * width, so that when the topmost tab is drawn, it obliterates part of
 * the frame.
 */

 /* Synched up with: Tabs.c 1.27.  

 This file contains essential XEmacs-related fixes to the original
 version of the Tabs widget. Be VERY careful about syncing if you ever
 update to a more recent version. In general this is probably now a
 bad idea.

 #### We need to check that various windows (the  whole widget, or a single
 tab) are of "reasonable" size, ie, we need to try for more sanity in the
 geometry management routines.
 */

/*
 * TODO: min child height = tab height
 */

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

#include	<X11/Xlib.h>
#include	<X11/IntrinsicP.h>
#include	<X11/StringDefs.h>

/* #### This may be risky, lwlib-internal.h redefines abort() */
#include	"lwlib-fonts.h"
#include	"lwlib-colors.h"
#include	"lwlib-internal.h"
#include	"../src/xmu.h"
#include	"xlwtabsP.h"
#include	"xlwgcs.h"

#define XFT_USE_HEIGHT_NOT_ASCENT_DESCENT 0

/* #### These should probably be resources. */
#define	MIN_WID		10
#define	MIN_HGT		10
#define	INDENT		3	/* tabs indented from edge by this much */
#define	SPACING		0	/* distance between tabs */
#define	SHADWID		1	/* default shadow width */
#define	TABDELTA	2	/* top tab grows this many pixels */
#define	TABLDELTA	2	/* top tab label offset this many pixels */


/****************************************************************
 *
 * IndexTabs Resources
 *
 ****************************************************************/

static	char	defaultTranslations[] = "\
	<BtnUp>:		select()	\n\
	<FocusIn>:		highlight()	\n\
	<FocusOut>:		unhighlight()	\n\
	<Key>Page_Up:		page(up)	\n\
	<Key>KP_Page_Up:	page(up)	\n\
	<Key>Prior:		page(up)	\n\
	<Key>KP_Prior:		page(up)	\n\
	<Key>Page_Down:		page(down)	\n\
	<Key>KP_Page_Down:	page(down)	\n\
	<Key>Next:		page(down)	\n\
	<Key>KP_Next:		page(down)	\n\
	<Key>Home:		page(home)	\n\
	<Key>KP_Home:		page(home)	\n\
	<Key>End:		page(end)	\n\
	<Key>KP_End:		page(end)	\n\
	<Key>Up:		highlight(up)	\n\
	<Key>KP_Up:		highlight(up)	\n\
	<Key>Down:		highlight(down)	\n\
	<Key>KP_Down:		highlight(down)	\n\
	<Key> :			page(select)	\n\
	 " ;

static	char	accelTable[] = "	#augment\n\
	<Key>Page_Up:		page(up)	\n\
	<Key>KP_Page_Up:	page(up)	\n\
	<Key>Prior:		page(up)	\n\
	<Key>KP_Prior:		page(up)	\n\
	<Key>Page_Down:		page(down)	\n\
	<Key>KP_Page_Down:	page(down)	\n\
	<Key>Next:		page(down)	\n\
	<Key>KP_Next:		page(down)	\n\
	<Key>Home:		page(home)	\n\
	<Key>KP_Home:		page(home)	\n\
	<Key>End:		page(end)	\n\
	<Key>KP_End:		page(end)	\n\
	<Key>Up:		highlight(up)	\n\
	<Key>KP_Up:		highlight(up)	\n\
	<Key>Down:		highlight(down)	\n\
	<Key>KP_Down:		highlight(down)	\n\
	<Key> :			page(select)	\n\
	 " ;
static	XtAccelerators	defaultAccelerators ; /* #### Never used */

#define	offset(field)	XtOffsetOf(TabsRec, tabs.field)
static XtResource resources[] = {

  {XtNselectInsensitive, XtCSelectInsensitive, XtRBoolean, sizeof(Boolean),
	offset(selectInsensitive), XtRImmediate, (XtPointer) True},
  {XtNfont, XtCFont, XtRFontStruct, sizeof(XFontStruct *),
	offset(font), XtRString, (XtPointer) XtDefaultFont},
#ifdef USE_XFT_TABS
  /* #### Maybe use "-*-helvetica-bold-r-*-*-*-120-*-*-*-*-iso8859-1" here?
     or XtDefaultFont? */
  {XtNfcFontName, XtCFcFontName, XtRString, sizeof(String),
	offset(fcFontName), XtRString, (XtPointer) "AirCut-16" },
  /* #### This needs to be fixed to give a proper type and converter for
     XftFonts.  See also xlwmenu.c. */
  {XtNxftFont, XtCXftFont, XtRPointer, sizeof(XtPointer),
	offset(renderFont), XtRPointer, (XtPointer) NULL },
#endif
  {XtNinternalWidth, XtCWidth, XtRDimension, sizeof(Dimension),
	offset(internalWidth), XtRImmediate, (XtPointer)4 },
  {XtNinternalHeight, XtCHeight, XtRDimension, sizeof(Dimension),
	offset(internalHeight), XtRImmediate, (XtPointer)4 },
  {XtNborderWidth, XtCBorderWidth, XtRDimension, sizeof(Dimension),
	XtOffsetOf(RectObjRec,rectangle.border_width), XtRImmediate, (XtPointer)0},
  {XtNtopWidget, XtCTopWidget, XtRWidget, sizeof(Widget),
	offset(topWidget), XtRImmediate, NULL},
  {XtNcallback, XtCCallback, XtRCallback, sizeof(XtPointer),
	offset(callbacks), XtRCallback, NULL},
  {XtNpopdownCallback, XtCCallback, XtRCallback, sizeof(XtPointer),
	offset(popdownCallbacks), XtRCallback, NULL},
  {XtNbeNiceToColormap, XtCBeNiceToColormap, XtRBoolean, sizeof(Boolean),
	offset(be_nice_to_cmap), XtRImmediate, (XtPointer) True},
  {XtNtopShadowContrast, XtCTopShadowContrast, XtRInt, sizeof(int),
	offset(top_shadow_contrast), XtRImmediate, (XtPointer) 20},
  {XtNbottomShadowContrast, XtCBottomShadowContrast, XtRInt, sizeof(int),
	offset(bot_shadow_contrast), XtRImmediate, (XtPointer) 40},
  {XtNinsensitiveContrast, XtCInsensitiveContrast, XtRInt, sizeof(int),
	offset(insensitive_contrast), XtRImmediate, (XtPointer) 33},
  {XtNaccelerators, XtCAccelerators, XtRAcceleratorTable,sizeof(XtTranslations),
	XtOffsetOf(TabsRec,core.accelerators), XtRString, accelTable},
};
#undef	offset



	/* constraint resources */

#define	offset(field)	XtOffsetOf(TabsConstraintsRec, tabs.field)
static XtResource tabsConstraintResources[] = {
  {XtNtabLabel, XtCLabel, XtRString, sizeof(String),
	offset(label), XtRString, NULL},
  {XtNtabLeftBitmap, XtCLeftBitmap, XtRBitmap, sizeof(Pixmap),
	offset(left_bitmap), XtRImmediate, None},
  {XtNtabForeground, XtCForeground, XtRPixel, sizeof(Pixel),
	offset(foreground), XtRString, (XtPointer) XtDefaultForeground},
  {XtNresizable, XtCResizable, XtRBoolean, sizeof(Boolean),
	offset(resizable), XtRImmediate, (XtPointer) True},
} ;
#undef	offset




#if	!NeedFunctionPrototypes

	/* FORWARD REFERENCES: */

	/* member functions */

static	void	TabsClassInit();
static	void	TabsInit();
static	void	TabsResize();
static	void	TabsExpose();
static	void	TabsDestroy();
static	void	TabsRealize();
static	Boolean	TabsSetValues();
static	Boolean	TabsAcceptFocus();
static	XtGeometryResult	TabsQueryGeometry();
static	XtGeometryResult	TabsGeometryManager();
static	void	TabsChangeManaged();
static	void	TabsConstraintInitialize() ;
static	Boolean	TabsConstraintSetValues() ;

	/* action procs */

static	void	TabsSelect() ;
static	void	TabsPage() ;
static	void	TabsHighlight() ;
static	void	TabsUnhighlight() ;

	/* internal privates */

static	void	TabsAllocGCs() ;	/* get rendering GCs */
static	void	TabsFreeGCs() ;		/* return rendering GCs */
static	void	DrawTabs() ;		/* draw all tabs */
static	void	DrawTab() ;		/* draw one index tab */
static	void	DrawFrame() ;		/* draw frame around contents */
static	void	DrawTrim() ;		/* draw trim around a tab */
static	void	DrawBorder() ;		/* draw border */
static	void	DrawHighlight() ;	/* draw highlight */
static	void	UndrawTab() ;		/* undraw interior of a tab */
static	void	TabWidth() ;		/* recompute tab size */
static	void	GetPreferredSizes() ;	/* query all children for their sizes */
static	void	MaxChild() ;		/* find max preferred child size */
static	int	PreferredSize() ;	/* compute preferred size */
static	int	PreferredSize2() ;	/* compute preferred size */
static	int	PreferredSize3() ;	/* compute preferred size */
static	void	MakeSizeRequest() ;	/* try to change size */
static	void	getBitmapInfo() ;
static	int	TabLayout() ;		/* lay out tabs */
static	void	TabsShuffleRows() ;	/* bring current tab to bottom row */

static	void	TabsAllocFgGC() ;
static	void	TabsAllocGreyGC() ;

#else

static	void	TabsClassInit(void) ;
static	void	TabsInit( Widget req, Widget new_, ArgList, Cardinal *nargs) ;
static	void	TabsConstraintInitialize(Widget, Widget, ArgList, Cardinal *) ;
static	void	TabsRealize(Widget, Mask *, XSetWindowAttributes *) ;
static	void	TabsDestroy( Widget w) ;
static	void	TabsResize( Widget w) ;
static	void	TabsExpose( Widget w, XEvent *event, Region region) ;
static	Boolean	TabsSetValues(Widget, Widget, Widget, ArgList, Cardinal *) ;
static	Boolean	TabsAcceptFocus(Widget, Time *);
static	Boolean	TabsConstraintSetValues(Widget, Widget, Widget,
			ArgList, Cardinal *) ;
static	XtGeometryResult TabsQueryGeometry(Widget,
				XtWidgetGeometry *, XtWidgetGeometry *) ;
static	XtGeometryResult TabsGeometryManager(Widget,
				XtWidgetGeometry *, XtWidgetGeometry *) ;
static	void	TabsChangeManaged( Widget w) ;

static	void	TabsSelect(Widget, XEvent *, String *, Cardinal *) ;
static	void	TabsPage(Widget, XEvent *, String *, Cardinal *) ;
static	void	TabsHighlight(Widget, XEvent *, String *, Cardinal *) ;
static	void	TabsUnhighlight(Widget, XEvent *, String *, Cardinal *) ;

static	void	DrawTabs( TabsWidget tw, Bool labels) ;
static	void	DrawTab( TabsWidget tw, Widget child, Bool labels) ;
static	void	DrawFrame( TabsWidget tw) ;
static	void	DrawTrim( TabsWidget, int x, int y,
		  int wid, int hgt, Bool bottom, Bool undraw) ;
static	void	DrawBorder( TabsWidget tw, Widget child, Bool undraw) ;
static	void	DrawHighlight( TabsWidget tw, Widget child, Bool undraw) ;
static	void	UndrawTab( TabsWidget tw, Widget child) ;

static	void	TabWidth( Widget w) ;
static	int	TabLayout( TabsWidget, Dimension wid, Dimension hgt, Dimension *r_hgt,
			Bool query_only) ;
static	void	GetPreferredSizes(TabsWidget) ;
static	void	MaxChild(TabsWidget, Widget except, Dimension, Dimension) ;
static	void	TabsShuffleRows( TabsWidget tw) ;
static	int	PreferredSize( TabsWidget,
			Dimension *reply_width, Dimension *reply_height,
			Dimension *reply_cw, Dimension *reply_ch) ;
static	int	PreferredSize2( TabsWidget, Dimension cw, Dimension ch,
			Dimension *rw, Dimension *rh) ;
static	int	PreferredSize3( TabsWidget, Dimension wid, Dimension hgt,
			Dimension *rw, Dimension *rh) ;
static	void	MakeSizeRequest(TabsWidget) ;

static	void	TabsAllocGCs(TabsWidget) ;
static	void	TabsFreeGCs(TabsWidget) ;
static	void	getBitmapInfo( TabsWidget tw, TabsConstraints tab) ;
static	void	TabsAllocFgGC( TabsWidget tw) ;
static	void	TabsAllocGreyGC( TabsWidget tw) ;

#endif

#define	AddRect(i,xx,yy,w,h)	\
  do{rects[(i)].x=(xx); rects[i].y=(yy);	\
     rects[i].width=(w); rects[i].height=(h);}while(0)

static	XtActionsRec	actionsList[] =
  {
    {"select",	TabsSelect},
    {"page",	TabsPage},
    {"highlight", TabsHighlight},
    {"unhighlight", TabsUnhighlight},
  } ;


/****************************************************************
*
* Full class record constant
*
****************************************************************/

#ifndef	NEED_MOTIF
#define	SuperClass	(&constraintClassRec)
#else
#define	SuperClass	(&xmManagerClassRec)
#endif

TabsClassRec tabsClassRec = {
  {
/* core_class fields      */
    /* superclass         */    (WidgetClass) SuperClass,
    /* class_name         */    "Tabs",
    /* widget_size        */    sizeof(TabsRec),
    /* class_initialize   */    TabsClassInit,
    /* class_part_init    */	NULL,			/* TODO? */
    /* class_inited       */	FALSE,
    /* initialize         */    TabsInit,
    /* initialize_hook    */	NULL,
    /* realize            */    TabsRealize,
    /* actions            */    actionsList,
    /* num_actions	  */	XtNumber(actionsList),
    /* resources          */    resources,
    /* num_resources      */    XtNumber(resources),
    /* xrm_class          */    NULLQUARK,
    /* compress_motion	  */	TRUE,
#if XtSpecificationRelease < 6
    /* compress_exposure  */	XtExposeCompressMaximal,
#else
    /* compress_exposure  */	XtExposeCompressMaximal|XtExposeNoRegion,
#endif
    /* compress_enterleave*/	TRUE,
    /* visible_interest   */    TRUE,
    /* destroy            */    TabsDestroy,
    /* resize             */    TabsResize,
    /* expose             */    TabsExpose,
    /* set_values         */    TabsSetValues,
    /* set_values_hook    */	NULL,
    /* set_values_almost  */    XtInheritSetValuesAlmost,
    /* get_values_hook    */	NULL,
    /* accept_focus       */    TabsAcceptFocus,
    /* version            */	XtVersion,
    /* callback_private   */    NULL,
    /* tm_table           */    defaultTranslations,
    /* query_geometry     */	TabsQueryGeometry,
    /* display_accelerator*/	XtInheritDisplayAccelerator,
    /* extension          */	NULL
  },
  {
/* composite_class fields */
    /* geometry_manager   */    TabsGeometryManager,
    /* change_managed     */    TabsChangeManaged,
    /* insert_child	  */	XtInheritInsertChild,	/* TODO? */
    /* delete_child	  */	XtInheritDeleteChild,	/* TODO? */
    /* extension          */	NULL
  },
  {
/* constraint_class fields */
    /* subresources	  */	tabsConstraintResources,
    /* subresource_count  */	XtNumber(tabsConstraintResources),
    /* constraint_size	  */	sizeof(TabsConstraintsRec),
    /* initialize	  */	TabsConstraintInitialize,
    /* destroy		  */	NULL,
    /* set_values	  */	TabsConstraintSetValues,
    /* extension	  */	NULL,
  },
#ifdef	NEED_MOTIF
/* Manager Class fields */
  {
    /* translations		*/	NULL,
    /* syn_resources		*/	NULL,
    /* num_syn_resources	*/	0,
    /* syn_constraint_resources	*/	NULL,
    /* num_syn_constraint_resources */	0,
    /* parent_process		*/	XmInheritParentProcess,
    /* extension		*/	NULL
  },
#endif
  {
/* Tabs class fields */
    /* extension	  */	NULL,
  }
};

WidgetClass tabsWidgetClass = (WidgetClass)&tabsClassRec;

#define TabsNumChildren(tw) (((TabsWidget)tw)->composite.num_children)
#define TabVisible(tab) \
	(XtIsManaged(tab) && \
	 ((TabsConstraints)((tab)->core.constraints))->tabs.visible)



static int debug_tabs = 0;	/* increase for more verbosity */

#ifdef USE_XFT_TABS
/* #### duplicated from xlwmenu.c -- CLEAN THIS SHIT UP!
   Undeclared so define at top. */
#define MINL(x,y) ((((unsigned long) (x)) < ((unsigned long) (y))) \
		   ? ((unsigned long) (x)) : ((unsigned long) (y)))

static int
x_xft_text_width (Display *dpy, XftFont *xft_font, FcChar8 *run, int len)
{
  static XGlyphInfo glyphinfo;	/* #### static? */

  XftTextExtents8 (dpy,
		   xft_font,
		   run, len, &glyphinfo);
  return glyphinfo.xOff;
}
#endif

/****************************************************************
 *
 * Member Procedures
 *
 ****************************************************************/

static void
TabsClassInit(void)
{
	defaultAccelerators = XtParseAcceleratorTable(accelTable) ;
	/* TODO: register converter for labels? */
}



	/* Init a newly created tabs widget.  Compute height of tabs
	 * and optionally compute size of widget. */

/* ARGSUSED */

static void
TabsInit(Widget request, Widget new_, ArgList UNUSED (args),
	 Cardinal *UNUSED (num_args))
{
    TabsWidget newTw = (TabsWidget)new_;

    newTw->tabs.numRows = 0 ;
    newTw->tabs.realRows = 0;

    GetPreferredSizes(newTw) ;

    /* height is easy, it's the same for all tabs:
     *  TODO: font height + height of tallest bitmap.
     */
    newTw->tabs.tab_height = 2 * newTw->tabs.internalHeight + SHADWID ;

#ifdef USE_XFT_TABS
    /* must get font here
       to do this right, we should add a new Xt Resource type +
       conversion function
    */
    newTw->tabs.renderFont =
      xft_open_font_by_name (XtDisplay ((Widget) newTw),
			     newTw->tabs.fcFontName);
    if (newTw->tabs.renderFont != NULL) 
#if XFT_USE_HEIGHT_NOT_ASCENT_DESCENT
      newTw->tabs.tab_height += newTw->tabs.renderFont->height;
#else
      newTw->tabs.tab_height += newTw->tabs.renderFont->ascent +
				newTw->tabs.renderFont->descent;
#endif /* XFT_USE_HEIGHT_NOT_ASCENT_DESCENT */
#else  /* ! USE_XFT_TABS */
    if (newTw->tabs.font != NULL)
      newTw->tabs.tab_height += newTw->tabs.font->max_bounds.ascent +
				newTw->tabs.font->max_bounds.descent;
#endif /* ! USE_XFT_TABS */

    /* if size not explicitly set, set it to our preferred size now. */

    if( request->core.width == 0 || request->core.height == 0 )
    {
      Dimension	w,h ;
      PreferredSize(newTw, &w, &h, NULL,NULL) ;
      if( request->core.width == 0 ) new_->core.width = w ;
      if( request->core.height == 0 ) new_->core.height = h ;
      XtClass(new_)->core_class.resize(new_) ;
    }

    /* defer GC allocation, etc., until Realize() time. */
    newTw->tabs.foregroundGC =
    newTw->tabs.backgroundGC =
    newTw->tabs.greyGC =
    newTw->tabs.topGC =
    newTw->tabs.botGC = None ;

    newTw->tabs.grey50 = None ;

    newTw->tabs.needs_layout = False ;

    newTw->tabs.hilight = NULL ;

#ifdef	NEED_MOTIF
    newTw->manager.navigation_type = XmTAB_GROUP ;
    newTw->manager.traversal_on = True ;
#endif
}


	/* Init the constraint part of a new tab child.  Compute the
	 * size of the tab.
	 */
/* ARGSUSED */
static	void
TabsConstraintInitialize(Widget UNUSED (request), Widget new_,
			 ArgList UNUSED (args), Cardinal *UNUSED (num_args))
{
	TabsConstraints tab = (TabsConstraints) new_->core.constraints ;
	tab->tabs.greyAlloc = False ;	/* defer allocation of pixel */
	tab->tabs.visible = False ;

	getBitmapInfo((TabsWidget)XtParent(new_), tab) ;
	TabWidth(new_) ;
}



	/* Called when tabs widget first realized.  Create the window
	 * and allocate the GCs
	 */

static	void
TabsRealize(Widget w, Mask *valueMask, XSetWindowAttributes *attributes)
{
	TabsWidget tw = (TabsWidget) w;

	attributes->bit_gravity = NorthWestGravity;
	*valueMask |= CWBitGravity;

	SuperClass->core_class.realize(w, valueMask, attributes);

	TabsAllocGCs(tw) ;
}



static	void
TabsDestroy(Widget w)
{
	TabsFreeGCs((TabsWidget)w) ;
}


	/* Parent has resized us.  This will require that the tabs be
	 * laid out again.
	 */

static void
TabsResize(Widget w)
{
	TabsWidget	tw = (TabsWidget) w;
	int		i ;
	int		num_children = tw->composite.num_children ;
	Widget		*childP ;
	/* TabsConstraints tab ; */ /* #### unused */
	Dimension	cw,ch,bw ;

	/* Our size has now been dictated by the parent.  Lay out the
	 * tabs, lay out the frame, lay out the children.  Remember
	 * that the tabs overlap each other and the frame by shadowWidth.
	 * Also, the top tab is larger than the others, so if there's only
	 * one row, the widget must be made taller to accommodate this.
	 *
	 * Once the tabs are laid out, if there is more than one
	 * row, we may need to shuffle the rows to bring the top tab
	 * to the bottom row.
	 */

	tw->tabs.needs_layout = False ;

	if( num_children > 0 && tw->composite.children != NULL )
	{
	  /* Loop through the tabs and assign rows & x positions */
	  (void) TabLayout(tw, tw->core.width, tw->core.height, NULL, False) ;
	  num_children = TabsNumChildren (tw);

	  /* assign a top widget, bring it to bottom row. */
	  TabsShuffleRows(tw) ;

	  /* now assign child positions & sizes.  Positions are all the
	   * same: just inside the frame.  Sizes are also all the same.
	   */

	  tw->tabs.child_width = cw = tw->core.width - 2 * SHADWID ;
	  tw->tabs.child_height = ch =
	    tw->core.height < (tw->tabs.tab_total + 2 * SHADWID) ? 0 :
	    tw->core.height - tw->tabs.tab_total - 2 * SHADWID ;

	  for(i=0, childP=tw->composite.children;
		i < num_children;
		++i, ++childP)
	    if( XtIsManaged(*childP) )
	    {
	      /* tab = (TabsConstraints) (*childP)->core.constraints ; */
	      bw = (*childP)->core.border_width ;
	      /* Don't do anything if we can't see any of the child. */
	      if (ch >= bw*2 && ch > 0 && cw >= bw*2 && cw > 0)
		XtConfigureWidget(*childP, SHADWID,tw->tabs.tab_total+SHADWID,
				  cw-bw*2,ch-bw*2, bw) ;
	    }
	  if( XtIsRealized(w) ) {
	    XClearWindow(XtDisplay((Widget)tw), XtWindow((Widget)tw)) ;
	    /* should not be necessary to explicitly repaint after a
	     * resize, but XEmacs folks tell me it is.
	     */
	    XtClass(tw)->core_class.expose((Widget)tw,NULL,None) ;
	  }
	}
} /* Resize */



	/* Redraw entire Tabs widget */

/* ARGSUSED */
static	void
TabsExpose(Widget w, XEvent *UNUSED (event), Region UNUSED (region))
{
	TabsWidget	tw = (TabsWidget) w;

	if( tw->tabs.needs_layout )
	  XtClass(w)->core_class.resize(w) ;

	DrawTabs(tw, True) ;
}


	/* Called when any Tabs widget resources are changed. */

/* ARGSUSED */
static	Boolean
TabsSetValues(Widget current, Widget UNUSED (request), Widget new_,
	      ArgList UNUSED (args), Cardinal *UNUSED (num_args))
{
	TabsWidget curtw = (TabsWidget) current ;
	TabsWidget tw = (TabsWidget) new_ ;
	Boolean	needRedraw = False ;
	Widget	*childP ;
	int	i ;

	if(
#ifdef USE_XFT_TABS
            tw->tabs.renderFont != curtw->tabs.renderFont  ||
#else
	    tw->tabs.font != curtw->tabs.font  ||
#endif
            tw->tabs.internalWidth != curtw->tabs.internalWidth ||
	    tw->tabs.internalHeight != curtw->tabs.internalHeight)
	{
	  tw->tabs.tab_height = 2 * tw->tabs.internalHeight + SHADWID;

#ifdef USE_XFT_TABS
	  if (tw->tabs.renderFont != NULL)
#if XFT_USE_HEIGHT_NOT_ASCENT_DESCENT
	    tw->tabs.tab_height += tw->tabs.renderFont->height;
#else
	    tw->tabs.tab_height += tw->tabs.renderFont->ascent +
				   tw->tabs.renderFont->descent;
#endif /* XFT_USE_HEIGHT_NOT_ASCENT_DESCENT */
#else  /* ! USE_XFT_TABS */
	  if (tw->tabs.font != NULL)
	    tw->tabs.tab_height += tw->tabs.font->max_bounds.ascent +
				   tw->tabs.font->max_bounds.descent;
#endif /* ! USE_XFT_TABS */

	  /* Tab size has changed.  Resize all tabs and request a new size */
	  for(i=0, childP=tw->composite.children;
		i < (int) tw->composite.num_children;
		++i, ++childP)
	    if( XtIsManaged(*childP) )
	      TabWidth(*childP) ;
	  PreferredSize(tw, &tw->core.width, &tw->core.height, NULL,NULL) ;
	  needRedraw = True ;
	  tw->tabs.needs_layout = True ;
	}

	/* TODO: if any color changes, need to recompute GCs and redraw */

	if( tw->core.background_pixel != curtw->core.background_pixel ||
	    tw->core.background_pixmap != curtw->core.background_pixmap ||
#ifdef USE_XFT_TABS
	    tw->tabs.renderFont != curtw->tabs.renderFont
#else
	    tw->tabs.font != curtw->tabs.font
#endif
	    )
	  if( XtIsRealized(new_) )
	  {
	    TabsFreeGCs(tw) ;
	    TabsAllocGCs(tw) ;
	    needRedraw = True ;
	  }

	if( tw->core.sensitive != curtw->core.sensitive )
	  needRedraw = True ;

	/* If top widget changes, need to change stacking order, redraw tabs.
	 * Window system will handle the redraws.
	 */

	if( tw->tabs.topWidget != curtw->tabs.topWidget )
	{
	  if( XtIsRealized(tw->tabs.topWidget) )
	  {
	    Widget		w = tw->tabs.topWidget ;
	    TabsConstraints	tab = (TabsConstraints) w->core.constraints ;

	    XRaiseWindow(XtDisplay(w), XtWindow(w)) ;
#ifdef	NEED_MOTIF
	    XtVaSetValues(curtw->tabs.topWidget, XmNtraversalOn, False, 0) ;
	    XtVaSetValues(w, XmNtraversalOn, True, 0) ;
#endif

	    if( tab->tabs.row != (int) tw->tabs.numRows-1 )
	      TabsShuffleRows(tw) ;

	    needRedraw = True ;
	  }
	  else
	    tw->tabs.needs_layout = True ;
	}

	return needRedraw ;
}


	/* Called when any child constraint resources change. */

/* ARGSUSED */
static	Boolean
TabsConstraintSetValues(Widget current, Widget UNUSED (request), Widget new_,
			ArgList UNUSED (args), Cardinal *UNUSED (num_args))
{
	TabsWidget tw = (TabsWidget) XtParent(new_) ;
	TabsConstraints ctab = (TabsConstraints) current->core.constraints ;
	TabsConstraints tab = (TabsConstraints) new_->core.constraints ;


	/* if label changes, need to re-layout the entire widget */
	/* if foreground changes, need to redraw tab label */

	/* TODO: only need resize of new bitmap has different dimensions
	 * from old bitmap.
	 */

	if( tab->tabs.label != ctab->tabs.label ||  /* Tab size has changed. */
	    tab->tabs.left_bitmap != ctab->tabs.left_bitmap )
	{
	  TabWidth(new_) ;
	  tw->tabs.needs_layout = True ;

	  if( tab->tabs.left_bitmap != ctab->tabs.left_bitmap )
	    getBitmapInfo(tw, tab) ;

	  /* If there are no subclass ConstraintSetValues procedures remaining
	   * to be invoked, and if the preferred size has changed, ask
	   * for a resize.
	   */
	  if( XtClass((Widget)tw) == tabsWidgetClass )
	    MakeSizeRequest(tw) ;
	}


	/* The child widget itself never needs a redisplay, but the parent
	 * Tabs widget might.
	 */

	if( XtIsRealized(new_) )
	{
	  if( tw->tabs.needs_layout ) {
	    XClearWindow(XtDisplay((Widget)tw), XtWindow((Widget)tw)) ;
	    XtClass(tw)->core_class.expose((Widget)tw,NULL,None) ;
	  }

	  else if( tab->tabs.foreground != ctab->tabs.foreground )
	    DrawTab(tw, new_, True) ;
	}

	return False ;
}


static	Boolean
TabsAcceptFocus(Widget w, Time *UNUSED (t))
{
	if( !w->core.being_destroyed && XtIsRealized(w) &&
	    XtIsSensitive(w) && XtIsManaged(w) && w->core.visible )
	{
	  Widget p ;
	  for(p = XtParent(w); !XtIsShell(p); p = XtParent(p)) ;
	  XtSetKeyboardFocus(p,w) ;
	  return True ;
	}
	else
	  return False ;
}



/*
 * Return status, with preferred size in PREFERRED.
 *
 * According to the X Toolkit Intrinsics manual
 *   XtGeometryYes    = accept INTENDED without change
 *   XtGeometryNo     = request to stay _exactly_ the same
 *   XtGeometryAlmost = suggest PREFERRED as a compromise
 * and the PREFERRED argument must be filled in completely (ie, any fields
 * whose bits are set in the request_mode mask must correspond to the
 * preferred geometry, which must be consistent with the return value).
 *
 * Assuming horizontal orientation, in XEmacs, we should always accept if
 * the width is more than we need.  There's no problem if there are only a
 * couple of tabs packed to the left.  OTOH there's probably something wrong
 * if we're offered a height more than 1.5x or 2x the preferred height.
 * (#### Do tab controls do vertical?)
 */

/* compute the height above which we complain */
#define TAB_HEIGHT_TOLERANCE(x) (2*x)

static XtGeometryResult
TabsQueryGeometry (Widget w,
		   XtWidgetGeometry *intended,
		   XtWidgetGeometry *preferred)	/* RETURN */
{
    TabsWidget tw = (TabsWidget) w;
    XtGeometryMask mode = intended->request_mode;
    
    preferred->request_mode = CWWidth | CWHeight;
    PreferredSize (tw, &preferred->width, &preferred->height, NULL, NULL);

    /* If width is big enough, accept it. */
    if ((mode & CWWidth) && intended->width >= preferred->width)
      preferred->width = intended->width;

    /* If height is within range, accept it.
       #### If too tall, we could offer a compromise at TAB_HEIGHT_TOLERANCE.
       Should we? */
    if ((mode & CWHeight) && intended->height >= preferred->height
	&& intended->height <= TAB_HEIGHT_TOLERANCE (preferred->height))
      preferred->height = intended->height;

    /* Compute return value. */
    if (preferred->width == ((mode & CWWidth) ? intended->width
					      : w->core.width)
	&& preferred->height == ((mode & CWHeight) ? intended->height
						   : w->core.height))
      return XtGeometryYes;
    else if (preferred->width == w->core.width
	     && preferred->height == w->core.height)
      return XtGeometryNo;
    else
      return XtGeometryAlmost;
}



/*
 * Geometry Manager; called when TAB (a child) wants to be resized.
 *
 * According to the X Toolkit Intrinsics manual
 *   XtGeometryDone   = accept REQUEST and do it (#### check this)
 *   XtGeometryYes    = accept REQUEST without change
 *   XtGeometryNo     = refuse REQUEST (ie, stay _exactly_ the same)
 *   XtGeometryAlmost = suggest REPLY as a compromise
 */

static XtGeometryResult
TabsGeometryManager (Widget tab,
		     XtWidgetGeometry *request,
		     XtWidgetGeometry *reply) /* RETURN */
{
	TabsWidget	 control = (TabsWidget) XtParent(tab);
	Dimension	 s = SHADWID;
	TabsConstraints	 constraint = (TabsConstraints) tab->core.constraints;
	XtGeometryResult result, best_offer = XtGeometryYes;
	Dimension	 rw, rh;

	static int debug_count = 0;
        static int debug_mask = 1;

	/* Position request cannot be satisfied, so if tabs are not resizable,
	   no nontrivial request can be satisfied: return XGeometryNo. */
	if (!constraint->tabs.resizable)
	  return XtGeometryNo;

	fprintf (stderr, "Urk! label is resizable!\n");

	/* Assume we will refuse these; toggle iff we accept them.
	   Reply won't specify any fields not in the request. */
	reply->request_mode = request->request_mode;
	reply->x = tab->core.x;
	reply->y = tab->core.y;

	/* If a position request would result in a change, best offer is
	   XtGeometryAlmost.  Otherwise toggle reply->request_mode. */
	if ((request->request_mode & CWX) && request->x != tab->core.x)
	  best_offer = XtGeometryAlmost;
	else
	  reply->request_mode &= ~CWX;
	if ((request->request_mode & CWY) && request->y != tab->core.y)
	  best_offer = XtGeometryAlmost;
	else
	  reply->request_mode &= ~CWY;

	/* Make all three fields in the reply valid */
	reply->width = (request->request_mode & CWWidth)
		       ? request->width : tab->core.width;
	reply->height = (request->request_mode & CWHeight)
			? request->height : tab->core.height;
	reply->border_width = (request->request_mode & CWBorderWidth)
			      ? request->border_width : tab->core.border_width;

	/* check if we can already offer a compromise */
	if (best_offer == XtGeometryAlmost &&
	    reply->width == tab->core.width &&
	    reply->height == tab->core.height &&
	    reply->border_width == tab->core.border_width)
	  {
	    reply->request_mode &= ~(CWWidth | CWHeight | CWBorderWidth);
	    return best_offer;
	  }

#ifndef DONT_DEBUG_REQUESTS
#define DBG_REQUEST_PRINT(name,field,size)				\
do {									\
  if (reply->field > size)						\
    {									\
      if (++debug_count == debug_mask)					\
	{								\
	  debug_mask <<= 1;						\
	  fprintf (stderr, "ridiculous %s request #%d: %d > %d\n",	\
		   name, debug_count, reply->field, size);		\
	}								\
      reply->field = tab->core.field;					\
    }									\
} while (0)

	DBG_REQUEST_PRINT ("width",width,1024);
	DBG_REQUEST_PRINT ("height",height,768);
	DBG_REQUEST_PRINT ("border_width",border_width,30);
#undef DBG_REQUEST_PRINT
#endif

	rw = reply->width + 2 * reply->border_width;
	rh = reply->height + 2 * reply->border_width;

	/* find out how big the children want to be now */
	MaxChild (control, tab, rw, rh);


	/* Size changes must see if the new size can be accommodated.
	 * The Tabs widget keeps all of its children the same height, but
	 * widths may vary.
	 * A request to shrink will be accepted only if the
	 * new size is still big enough for all other children.  A
	 * request to shrink that is not big enough for all children
	 * returns an "almost" response with the new proposed size
	 * or a "no" response if unable to shrink at all.
	 *
	 * A request to grow will be accepted only if the Tabs control can
	 * grow to accommodate.
	 *
	 * TODO:
	 * We could get fancy here and re-arrange the tabs if it is
	 * necessary to compromise with the parent, but we'll save that
	 * for another day.
	 */

	if (request->request_mode & (CWWidth | CWHeight | CWBorderWidth))
	{
	  Dimension	cw,ch ;		/* children's preferred size */
	  Dimension	aw,ah ;		/* available size we can give child */
	  Dimension	th ;		/* space used by tabs */
	  Dimension	wid,hgt ;	/* Tabs widget size */
	  int check_nrows;

	  cw = control->tabs.max_cw ;
	  ch = control->tabs.max_ch ;

	  /* find out what *my* resulting preferred size would be */
	  /* #### this whole API is wrong; what should happen is
	     1. app should hint as to #rows and/or aspect ratio
	     2. tab control should attempt to layout in current space
	     3. if not all tabs fit, should request resize to achieve
		layout hints
	     Probably can and should cache preferred size in widget, with
	     cache cleared when labels or core size changes. */
	  PreferredSize2(control, cw, ch, &wid, &hgt) ;

	  /* Would my size change?  If so, ask to be resized. */

	  if (wid != control->core.width || hgt != control->core.height)
	  {
	    Dimension oldWid = control->core.width,
		      oldHgt = control->core.height;
	    XtWidgetGeometry	myrequest, myreply ;

	    myrequest.width = wid ;
	    myrequest.height = hgt ;
	    myrequest.request_mode = CWWidth | CWHeight ;
	    
	    assert (wid > 0 && hgt > 0);
	    /* If child is only querying, or if we're going to have to
	     * offer the child a compromise, then make this a query only.
	     */

	    if ((request->request_mode & XtCWQueryOnly) || rw < cw || rh < ch)
	      myrequest.request_mode |= XtCWQueryOnly;

	    result = XtMakeGeometryRequest ((Widget) control,
					    &myrequest, &myreply);

	    /* !$@# Athena Box widget changes the core size even if QueryOnly
	     * is set.  I'm convinced this is a bug.  At any rate, to work
	     * around the bug, we need to restore the core size after every
	     * query geometry request.  This is only partly effective,
	     * as there may be other boxes further up the tree.
	     */
	    if (myrequest.request_mode & XtCWQueryOnly) {
	      control->core.width = oldWid;
	      control->core.height = oldHgt;
	    }

	    /* based on the parent's response, determine what the
	     * resulting Tabs widget size would be.
	     */

	    switch (result) {
	      case XtGeometryYes:
	      case XtGeometryDone:
		control->tabs.needs_layout = True;
		break;

	      case XtGeometryNo:
		wid = control->core.width;
		hgt = control->core.height;
		break;

	      case XtGeometryAlmost:
		wid = myreply.width;
		hgt = myreply.height;
		control->tabs.needs_layout = True;
		break;
	    }
	  }

	  /* Within the constraints imposed by the parent, what is
	   * the max size we can give the child?
	   */
	  check_nrows = TabLayout (control, wid, hgt, &th, True);
	  aw = wid - 2*s;
	  if (check_nrows == 1)
	    {
	      ah = hgt - th - 2*s;
	    }
	  else
	    {
	      /* this rarely gets triggered, but when it does it seems to
		 get triggered forever after */
	      int n = control->composite.num_children;
	      ah = control->tabs.tab_height;
	      if (debug_tabs > 1)
		fprintf (stderr, "Kludging around %d != 1 rows,"
			 " #children = %d, total height %d, using %d.\n",
			 check_nrows, n, th, ah);
	    }

	  /* OK, make our decision.  If requested size is >= max sibling
	   * preferred size, AND requested size <= available size, then
	   * we accept.  Otherwise, we offer a compromise.
	   */

	  if (rw == aw && rh == ah)
	  {
	    /* Acceptable.  If this wasn't a query, change *all* children
	     * to this size.
	     */
	    if (request->request_mode & XtCWQueryOnly)
	      {
		control->tabs.needs_layout = False;
		return XtGeometryYes ;
	      }
	    else
	    {
	      Widget	*childP = control->composite.children;
	      int	i, bw;
	      tab->core.border_width = request->border_width;
	      for (i = TabsNumChildren (control); --i >= 0; ++childP)
		if (TabVisible (*childP))
		{
		  bw = (*childP)->core.border_width;
		  XtConfigureWidget (*childP, s, control->tabs.tab_total+s,
				     rw-2*bw, rh-2*bw, bw);
		}
#ifdef	COMMENT
	      /* TODO: under what conditions will we need to redraw? */
	      XClearWindow (XtDisplay ((Widget) control),
			    XtWindow ((Widget) control));
	      XtClass (control)->core_class.expose ((Widget)control,
						    NULL, NULL);
#endif	/* COMMENT */
	      return XtGeometryDone;
	    }
	  }

	  /* Cannot grant child's request.  Describe what we *can* do
	   * and return counter-offer.
	   */
	  control->tabs.needs_layout = False;
	  reply->width  = aw - 2 * request->border_width ;
	  reply->height = ah - 2 * request->border_width ;
	  reply->request_mode &=
	    ~((reply->border_width == tab->core.border_width
	       ? CWBorderWidth : 0)
	      |(reply->width == tab->core.width ? CWWidth : 0)
	      |(reply->height == tab->core.height ? CWHeight : 0));
	  return XtGeometryAlmost ;
	}

	return XtGeometryYes ;
}




	/* The number of children we manage has changed; recompute
	 * size from scratch.
	 */

static	void
TabsChangeManaged(Widget w)
{
    TabsWidget	tw = (TabsWidget)w ;
    Widget	*childP = tw->composite.children ;
    int		i ;

    if( tw->tabs.topWidget != NULL &&
        ( !XtIsManaged(tw->tabs.topWidget) ||
	  tw->tabs.topWidget->core.being_destroyed ) )
      tw->tabs.topWidget = NULL ;

    /* Check whether the highlight tab is still valid. */
    if( tw->tabs.hilight != NULL &&
        ( !XtIsManaged(tw->tabs.hilight) ||
	  tw->tabs.hilight->core.being_destroyed ) )
      tw->tabs.hilight = NULL ;

    GetPreferredSizes(tw) ;
    MakeSizeRequest(tw) ;

    XtClass(w)->core_class.resize(w) ;
    if( XtIsRealized(w) )
    {
      Display *dpy = XtDisplay(w) ;
      XClearWindow(dpy, XtWindow(w)) ;
      XtClass(w)->core_class.expose(w,NULL,NULL) ;

      /* make sure the top widget stays on top.  This requires
       * making sure that all new children are realized first.
       */
      if( tw->tabs.topWidget != NULL && XtIsRealized(tw->tabs.topWidget) )
      {
	for(i=TabsNumChildren (tw); --i >= 0; ++childP)
	  if( !XtIsRealized(*childP) )
	    XtRealizeWidget(*childP) ;

	XRaiseWindow(dpy, XtWindow(tw->tabs.topWidget)) ;
      }
    }

#ifdef	NEED_MOTIF
    /* Only top widget may receive input */

    for(childP = tw->composite.children, i=tw->composite.num_children;
        --i >= 0;
	++childP)
    {
      XtVaSetValues(*childP, XmNtraversalOn, False, 0) ;
    }

    if( tw->tabs.topWidget != NULL )
      XtVaSetValues(tw->tabs.topWidget, XmNtraversalOn, True, 0) ;
#endif
}




/****************************************************************
 *
 * Action Procedures
 *
 ****************************************************************/


	/* User clicks on a tab, figure out which one it was. */

/* ARGSUSED */
static	void
TabsSelect(Widget w, XEvent *event, String *UNUSED (params),
	   Cardinal *UNUSED (num_params))
{
	TabsWidget	tw = (TabsWidget) w ;
	Widget	*childP ;
	Position x,y ;
	Dimension h = tw->tabs.tab_height ;
	int	i ;

#ifdef	NEED_MOTIF
	XmProcessTraversal (w, XmTRAVERSE_CURRENT) ;
#endif

	/* TODO: is there an Xmu function or something to do this instead? */
	switch( event->type ) {
	  case ButtonPress:
	  case ButtonRelease:
	    x = event->xbutton.x ; y = event->xbutton.y ; break ;
	  case KeyPress:
	  case KeyRelease:
	    x = event->xkey.x ; y = event->xkey.y ; break ;
	  default:
	    return ;
	}

	/* TODO: determine which tab was clicked, if any.  Set that
	 * widget to be top of stacking order with XawTabsSetTop().
	 */
	for(i=0, childP=tw->composite.children;
	      i < (int) TabsNumChildren (tw);
	      ++i, ++childP)
	  if( TabVisible(*childP) )
	  {
	    TabsConstraints tab = (TabsConstraints)(*childP)->core.constraints;
	    if( x > tab->tabs.x  &&  x < tab->tabs.x + tab->tabs.width  &&
		y > tab->tabs.y  &&  y < tab->tabs.y + h )
	    {
	      if( *childP != tw->tabs.topWidget &&
		  (XtIsSensitive(*childP) || tw->tabs.selectInsensitive) )
		XawTabsSetTop(*childP, True) ;
	      break ;
	    }
	  }
}


	/* User hits a key */

static	void
TabsPage(Widget w, XEvent *UNUSED (event), String *params,
	 Cardinal *num_params)
{
	TabsWidget	tw = (TabsWidget) w ;
	Widget		newtop = NULL;
	Widget		*childP ;
	int		idx ;
	int		nc = TabsNumChildren (tw) ;

	if( nc <= 0 )
	  return ;

	if( *num_params < 1 ) {
	  XtAppWarning(XtWidgetToApplicationContext(w),
	    "Tabs: page() action called with no arguments") ;
	  return ;
	}

	if( tw->tabs.topWidget == NULL )
	  tw->tabs.topWidget = tw->composite.children[0] ;

	for(idx=0, childP=tw->composite.children; idx < nc; ++idx, ++childP )
	  if( tw->tabs.topWidget == *childP )
	    break ;

	switch( params[0][0] ) {
	  case 'u':		/* up */
	  case 'U':
	    if( --idx < 0 )
	      idx = nc-1 ;
	    newtop = tw->composite.children[idx] ;
	    break ;

	  case 'd':		/* down */
	  case 'D':
	    if( ++idx >= nc )
	      idx = 0 ;
	    newtop = tw->composite.children[idx] ;
	    break ;

	  case 'h':
	  case 'H':
	  default:
	      newtop = tw->composite.children[0] ;
	      break ;

	  case 'e':
	  case 'E':
	      newtop = tw->composite.children[nc-1] ;
	      break ;

	  case 's':		/* selected */
	  case 'S':
	      if( (newtop = tw->tabs.hilight) == NULL )
		return ;
	      break ;
	}

	XawTabsSetTop(newtop, True) ;
}


	/* User hits up/down key */

static	void
TabsHighlight(Widget w, XEvent *UNUSED (event), String *params,
	      Cardinal *num_params)
{
	TabsWidget	tw = (TabsWidget) w ;
	Widget		newhl = NULL;
	Widget		*childP ;
	int		idx ;
	int		nc = TabsNumChildren (tw) ;

	if( nc <= 0 )
	  return ;

	if( *num_params < 1 )
	{
	  if( tw->tabs.hilight != NULL )
	    DrawHighlight(tw, tw->tabs.hilight, False) ;
	  return ;
	}

	if( tw->tabs.hilight == NULL )
	  newhl = tw->composite.children[0] ;

	else
	{
	  /* find index of currently highlit child */
	  for(idx=0, childP=tw->composite.children; idx < nc; ++idx, ++childP )
	    if( tw->tabs.hilight == *childP )
	      break ;

	  switch( params[0][0] ) {
	    case 'u':		/* up */
	    case 'U':
	      if( --idx < 0 )
		idx = nc-1 ;
	      newhl = tw->composite.children[idx] ;
	      break ;

	    case 'd':		/* down */
	    case 'D':
	      if( ++idx >= nc )
		idx = 0 ;
	      newhl = tw->composite.children[idx] ;
	      break ;

	    case 'h':
	    case 'H':
		newhl = tw->composite.children[0] ;
		break ;

	    case 'e':
	    case 'E':
		newhl = tw->composite.children[nc-1] ;
		break ;

	    default:
		newhl = tw->tabs.hilight ;
		break ;
	  }
	}

	XawTabsSetHighlight(w, newhl) ;
}



static	void
TabsUnhighlight(Widget w, XEvent *UNUSED (event), String *UNUSED (params),
		Cardinal *UNUSED (num_params))
{
	TabsWidget	tw = (TabsWidget) w ;
	int		nc = tw->composite.num_children ;

	if( nc <= 0 )
	  return ;

	if( tw->tabs.hilight != NULL )
	  DrawHighlight(tw, tw->tabs.hilight, True) ;
}





/****************************************************************
 *
 * Public Procedures
 *
 ****************************************************************/


	/* Set the top tab, optionally call all callbacks. */
void
XawTabsSetTop(Widget w, Bool callCallbacks)
{
	TabsWidget	tw = (TabsWidget)w->core.parent ;
	TabsConstraints tab ;
	Widget		oldtop = tw->tabs.topWidget ;

	if( !XtIsSubclass(w->core.parent, tabsWidgetClass) )
	{
	  char line[256] ;
	  sprintf(line, "XawTabsSetTop: widget \"%.64s\" is not the child of a tabs widget.", XtName(w)) ;
	  XtAppWarning(XtWidgetToApplicationContext(w), line) ;
	  return ;
	}

	if( callCallbacks )
	  XtCallCallbackList(w, tw->tabs.popdownCallbacks,
		(XtPointer)tw->tabs.topWidget) ;

	if( !XtIsRealized(w) ) {
	  tw->tabs.topWidget = w ;
	  tw->tabs.needs_layout = True ;
	  tw->tabs.hilight = NULL; /* The highlight tab might disappear. */
	  return ;
	}

	XRaiseWindow(XtDisplay(w), XtWindow(w)) ;
#ifdef	NEED_MOTIF
	XtVaSetValues(oldtop, XmNtraversalOn, False, 0) ;
	XtVaSetValues(w, XmNtraversalOn, True, 0) ;
#endif

	tab = (TabsConstraints) w->core.constraints ;

	/* Unhighlight before we start messing with the stacking order. */
	if( tw->tabs.hilight != NULL )
	  {
	    DrawHighlight(tw, tw->tabs.hilight, True) ;
	    tw->tabs.hilight = NULL;
	  }

	if( tab->tabs.row == 0 )
	{
	  /* Easy case; undraw current top, undraw new top, assign new
	   * top, redraw all borders.
	   * We *could* just erase and execute a full redraw, but I like to
	   * reduce screen flicker.
	   */
	  UndrawTab(tw, oldtop) ;		/* undraw old */
	  DrawBorder(tw, oldtop, True) ;
	  UndrawTab(tw, w) ;			/* undraw new */
	  DrawBorder(tw, w, True) ;
	  tw->tabs.topWidget = w ;
	  DrawTab(tw, oldtop, True) ;		/* redraw old */
	  DrawTab(tw, w, True) ;		/* redraw new */
	  DrawTabs(tw, False) ;
	}
	else
	{
	  tw->tabs.topWidget = w ;
	  TabsShuffleRows(tw) ;
	  XClearWindow(XtDisplay((Widget)tw), XtWindow((Widget)tw)) ;
	  XtClass(tw)->core_class.expose((Widget)tw,NULL,None) ;
	}

	XawTabsSetHighlight((Widget)tw, w) ;

	if( callCallbacks )
	  XtCallCallbackList(w, tw->tabs.callbacks, (XtPointer)w) ;
}


	/* Set the top tab, optionally call all callbacks. */
void
XawTabsSetHighlight(Widget t, Widget w)
{
	TabsWidget	tw = (TabsWidget)t ;

	if( !XtIsSubclass(t, tabsWidgetClass) )
	  return ;

	if( XtIsRealized(t) && w != tw->tabs.hilight )
	{
	  if( w != NULL )
	    DrawHighlight(tw, w, False) ;
	}

	tw->tabs.hilight = w ;
}




/****************************************************************
 *
 * Private Procedures
 *
 ****************************************************************/


static	void
TabsAllocGCs(TabsWidget tw)
{
	TabsAllocFgGC(tw) ;
	TabsAllocGreyGC(tw) ;
	tw->tabs.backgroundGC = AllocBackgroundGC((Widget)tw, None) ;
	tw->tabs.topGC = AllocTopShadowGC((Widget)tw,
		tw->tabs.top_shadow_contrast, tw->tabs.be_nice_to_cmap) ;
	tw->tabs.botGC = AllocBotShadowGC((Widget)tw,
		tw->tabs.bot_shadow_contrast, tw->tabs.be_nice_to_cmap) ;
}


static	void
TabsFreeGCs(TabsWidget tw)
{
	Widget w = (Widget) tw;

	XtReleaseGC(w, tw->tabs.foregroundGC) ;
	XtReleaseGC(w, tw->tabs.greyGC) ;
	XtReleaseGC(w, tw->tabs.backgroundGC) ;
	XtReleaseGC(w, tw->tabs.topGC) ;
	XtReleaseGC(w, tw->tabs.botGC) ;
#ifdef HAVE_XMU
	XmuReleaseStippledPixmap(XtScreen(w), tw->tabs.grey50) ;
#endif
}





	/* Redraw entire Tabs widget */

static	void
DrawTabs(TabsWidget tw, Bool labels)
{
	Widget		*childP ;
	int		i,j ;
	Dimension	s = SHADWID ;
	Dimension	th = tw->tabs.tab_height ;
	Position	y ;
	TabsConstraints	tab ;

 	if( !XtIsRealized((Widget)tw))
 	  return ;

	/* draw tabs and frames by row except for the top tab, which
	 * is drawn last.  (This is inefficiently written, but should not
	 * be too slow as long as there are not a lot of rows.)
	 */

	y = tw->tabs.numRows == 1 ? TABDELTA : 0 ;
	for(i=0; i < (int) tw->tabs.numRows; ++i, y += th)
	{
 	  for( j=TabsNumChildren (tw), childP=tw->composite.children;
  	      --j >= 0; ++childP )
	    if( TabVisible(*childP) )
	    {
	      tab = (TabsConstraints)(*childP)->core.constraints;
	      if( tab->tabs.row == i && *childP != tw->tabs.topWidget )
		DrawTab(tw, *childP, labels) ;
	    }
	  if( i != (int) tw->tabs.numRows -1 )
	    DrawTrim(tw, 0,y+th, tw->core.width, th+s, False,False) ;
	}

	DrawFrame(tw) ;

	/* and now the top tab */
	if( tw->tabs.topWidget != NULL )
	  DrawTab(tw, tw->tabs.topWidget, labels) ;
}



/* Draw one tab.  Corners are rounded very slightly. */

static	void
DrawTab(TabsWidget tw, Widget child, Bool labels)
{
	GC	gc ;
	int	x,y ;

	if (debug_tabs > 2) fprintf (stderr, "DrawTab called.\n");

 	if( !XtIsRealized((Widget)tw))
 	  return ;

	DrawBorder(tw, child, False) ;

	if( labels )
	{
	  TabsConstraints tab = (TabsConstraints)child->core.constraints;
	  Display	*dpy = XtDisplay((Widget)tw) ;
	  Window	win = XtWindow((Widget)tw) ;
	  String	lbl = tab->tabs.label != NULL ?
			      tab->tabs.label : XtName(child) ;
#ifdef USE_XFT_TABS
	  XftColor color;
	  XftColor colorBG;
	  Colormap cmap = tw->core.colormap;
	  Visual *visual;
	  int ignored;

	  visual_info_from_widget ((Widget) tw, &visual, &ignored);
	  colorBG = xft_convert_color (dpy, cmap, visual,
				       tw->core.background_pixel, 0);
#endif

	  if (debug_tabs > 2)
	    fprintf (stderr, "(Re)drawing labels.\n");

	  if (XtIsSensitive(child))
	  {
	    gc = tw->tabs.foregroundGC;
#ifdef USE_XFT_TABS
	    color = xft_convert_color (dpy, cmap, visual,
				       tab->tabs.foreground, 0);
#else
	    XSetForeground(dpy, gc, tab->tabs.foreground);
#endif
	  }
	  else
	  {
	    /* grey pixel allocation deferred until now */
	    if (!tab->tabs.greyAlloc)
	    {
	      if (tw->tabs.be_nice_to_cmap || tw->core.depth == 1)
		tab->tabs.grey = tab->tabs.foreground;
	      else
		tab->tabs.grey = AllocGreyPixel ((Widget) tw,
					tab->tabs.foreground,
					tw->core.background_pixel,
					tw->tabs.insensitive_contrast);
	      tab->tabs.greyAlloc = True;
	    }
	    gc = tw->tabs.greyGC;
#ifdef USE_XFT_TABS
	    color = xft_convert_color (dpy, cmap, visual, tab->tabs.grey, 0);
#else
	    XSetForeground(dpy, gc, tab->tabs.grey);
#endif
	  }

	  x = tab->tabs.x;
	  y = tab->tabs.y;
	  if (child == tw->tabs.topWidget)
	    y -= TABLDELTA;

	  if (tab->tabs.left_bitmap != None && tab->tabs.lbm_width > 0)
	  {
	    if (tab->tabs.lbm_depth == 1)
	      XCopyPlane(dpy, tab->tabs.left_bitmap, win,gc,
		0,0, tab->tabs.lbm_width, tab->tabs.lbm_height,
		x+tab->tabs.lbm_x, y+tab->tabs.lbm_y, 1L);
	    else
	      XCopyArea(dpy, tab->tabs.left_bitmap, win,gc,
		0,0, tab->tabs.lbm_width, tab->tabs.lbm_height,
		x+tab->tabs.lbm_x, y+tab->tabs.lbm_y);
	  }

	  if (lbl != NULL &&
#ifdef USE_XFT_TABS
	      tw->tabs.renderFont != NULL
#else
	      tw->tabs.font != NULL
#endif
	      )
	    {
#ifdef USE_XFT_TABS
	      XftDraw *xftDraw = XftDrawCreate (dpy, win, visual, cmap);
	      XftFont *renderFont = tw->tabs.renderFont;
	      XGlyphInfo glyphinfo;
	      XftColor colorDBG;
	      XftColorAllocName (dpy, visual, cmap, "wheat", &colorDBG);
	      XftTextExtents8 (dpy, renderFont, (FcChar8 *) lbl,
			       (int) strlen (lbl), &glyphinfo);
	      /* #### unnecessary? for the moment, give visual extent */
	      /* draw background rect */
	      if (debug_tabs > 2)
		{
		  fprintf (stderr, "background color:  pixel=%08lx, r=%04x,"
			   " g=%04x, b=%04x, alpha=%04x.\n",
			   colorDBG.pixel, colorDBG.color.red,
			   colorDBG.color.green, colorDBG.color.blue,
			   colorDBG.color.alpha);
 		  fprintf (stderr, "label geometry: x=%d, y=%d, xOff=%d,"
 			   " yOff=%d, width=%d, height=%d\n",
 			   glyphinfo.x, glyphinfo.y, glyphinfo.xOff,
 			   glyphinfo.yOff, glyphinfo.width, glyphinfo.height);
 		}
	      if (debug_tabs > 2)
		XftDrawRect (xftDraw, &colorDBG,
			     /* left, top, width, height */
			     x+tab->tabs.l_x-glyphinfo.x,
			     y+tab->tabs.l_y-glyphinfo.y,
			     glyphinfo.width, glyphinfo.height);

	      /* draw text */
	      if (debug_tabs > 1)
		{
		  fprintf (stderr, "label:             %s.\n", lbl);
		  fprintf (stderr, "foreground color:  pixel=%08lx, r=%04x,"
				   " g=%04x, b=%04x, alpha=%04x.\n",
			   color.pixel, color.color.red, color.color.green,
			   color.color.blue, color.color.alpha);
		  fprintf (stderr, "extent:            x=%d, y=%d, xOffset=%d,"
				   " yOffset=%d, height=%d, width=%d.\n",
			   glyphinfo.x, glyphinfo.y, glyphinfo.xOff,
			   glyphinfo.yOff, glyphinfo.height, glyphinfo.width);
		}
	      if (debug_tabs > 0)
		{
		  FcValue name;
		  FcValue size;
		  FcPatternGet (renderFont->pattern, FC_FAMILY, 0, &name);
		  FcPatternGet (renderFont->pattern, FC_SIZE, 0, &size);
		  fprintf (stderr, "font:              name=%s-%.1f,"
				   " height=%d, ascent=%d, descent=%d.\n",
			   name.u.s, size.u.d, renderFont->height,
			   renderFont->ascent, renderFont->descent);
		}
	      XftDrawString8 (xftDraw, &color, renderFont,
			      x+tab->tabs.l_x, y+tab->tabs.l_y,
			      (FcChar8 *) lbl, (int) strlen (lbl));
	      XftDrawDestroy (xftDraw);
#else
	      XDrawString(dpy,win,gc,
			  x+tab->tabs.l_x, y+tab->tabs.l_y,
			  lbl, (int)strlen(lbl));
#endif
	    }
	}

	if (child == tw->tabs.hilight)
	  DrawHighlight(tw, child, False);
}


	/* draw frame all the way around the child windows. */

static	void
DrawFrame(TabsWidget tw)
{
	GC		topgc = tw->tabs.topGC ;
	GC		botgc = tw->tabs.botGC ;
	Dimension	s = SHADWID ;
	Dimension	ch = tw->tabs.child_height ;
	if (ch > 0)
	  Draw3dBox((Widget)tw, 0,tw->tabs.tab_total,
		    tw->core.width, ch+2*s, s, topgc, botgc) ;
	else
	  {
	    Widget		w = tw->tabs.topWidget ;
	    if (w != NULL)
	      {
		TabsConstraints	tab = (TabsConstraints) w->core.constraints ;
		Draw3dBox((Widget)tw, 0,tw->core.height - 2*s,
			  tab->tabs.x, 2*s, s, topgc, botgc);
		Draw3dBox((Widget)tw, tab->tabs.x + tab->tabs.width, 
			  tw->core.height - 2*s,
			  tw->core.width - tab->tabs.x - tab->tabs.width, 2*s, s, 
			  topgc, botgc);
	      }
	    else
	      Draw3dBox((Widget)tw, 0,tw->core.height - 2*s,
			tw->core.width, 2*s, s, topgc, botgc) ;
	  }
}


	/* draw trim around a tab or underneath a row of tabs */

static	void
DrawTrim(TabsWidget tw,		/* widget */
	int	x,		/* upper-left corner */
	int	y,
	int	wid,		/* total size */
	int	hgt,
	Bool	bottom,		/* draw bottom? */
	Bool	undraw)		/* undraw all */
{
	Display		*dpy = XtDisplay((Widget)tw) ;
	Window		win = XtWindow((Widget)tw) ;
	GC		bggc = tw->tabs.backgroundGC ;
	GC		topgc = undraw ? bggc : tw->tabs.topGC ;
	GC		botgc = undraw ? bggc : tw->tabs.botGC ;
	if( bottom )
	  XDrawLine(dpy,win,bggc, x,y+hgt-1, x+wid-1,y+hgt-1) ;	/* bottom */
	XDrawLine(dpy,win,topgc, x,y+2, x,y+hgt-2) ;		/* left */
	XDrawPoint(dpy,win,topgc, x+1,y+1) ;			/* corner */
	XDrawLine(dpy,win,topgc, x+2,y, x+wid-3,y) ;		/* top */
	XDrawLine(dpy,win,botgc, x+wid-2,y+1, x+wid-2,y+hgt-2) ; /* right */
	XDrawLine(dpy,win,botgc, x+wid-1,y+2, x+wid-1,y+hgt-2) ; /* right */
}


/* Draw one tab border. */

static	void
DrawBorder(TabsWidget tw, Widget child, Bool undraw)
{
	TabsConstraints tab = (TabsConstraints)child->core.constraints;
	Position	x = tab->tabs.x ;
	Position	y = tab->tabs.y ;
	Dimension	twid = tab->tabs.width ;
	Dimension	thgt = tw->tabs.tab_height ;

	/* top tab requires a little special attention; it overlaps
	 * neighboring tabs slightly, so the background must be cleared
	 * in the region of the overlap to partially erase those neighbors.
	 * TODO: is this worth doing with regions instead?
	 */
	if( child == tw->tabs.topWidget )
	{
	  Display	*dpy = XtDisplay((Widget)tw) ;
	  Window	win = XtWindow((Widget)tw) ;
	  GC		bggc = tw->tabs.backgroundGC ;
	  XRectangle	rects[3] ;
	  x -= TABDELTA ;
	  y -= TABDELTA ;
	  twid += TABDELTA*2 ;
	  thgt += TABDELTA ;
	  AddRect(0, x,y+1,twid,TABDELTA) ;
	  AddRect(1, x+1,y,TABDELTA,thgt) ;
	  AddRect(2, x+twid-TABDELTA-1,y,TABDELTA,thgt) ;
	  XFillRectangles(dpy,win,bggc, rects, 3) ;
	}

	DrawTrim(tw, x,y,twid,thgt+1, child == tw->tabs.topWidget, undraw) ;
}


/* Draw highlight around tab that has focus */

static	void
DrawHighlight(TabsWidget tw, Widget child, Bool undraw)
{
	TabsConstraints tab = (TabsConstraints)child->core.constraints;
	Display		*dpy = XtDisplay((Widget)tw) ;
	Window		win = XtWindow((Widget)tw) ;
	GC		gc ;
	Position	x = tab->tabs.x ;
	Position	y = tab->tabs.y ;
	Dimension	wid = tab->tabs.width ;
	Dimension	hgt = tw->tabs.tab_height ;
	XPoint		points[6] ;

	/* top tab does not have a highlight */

	if( child == tw->tabs.topWidget )
	  return ;

	if( undraw )
	  gc = tw->tabs.backgroundGC ;

	else if( XtIsSensitive(child) )
	{
	  gc = tw->tabs.foregroundGC ;
	  XSetForeground(dpy, gc, tab->tabs.foreground) ;
	}
	else
	{
	  gc = tw->tabs.greyGC ;
	  XSetForeground(dpy, gc, tab->tabs.grey) ;
	}

	points[0].x = x+1 ; points[0].y = y+hgt-1 ;
	points[1].x = x+1 ; points[1].y = y+2 ;
	points[2].x = x+2 ; points[2].y = y+1 ;
	points[3].x = x+wid-4 ; points[3].y = y+1 ;
	points[4].x = x+wid-3 ; points[4].y = y+2 ;
	points[5].x = x+wid-3 ; points[5].y = y+hgt-1 ;

	XDrawLines(dpy,win,gc, points,6, CoordModeOrigin) ;
}


/* Undraw one tab interior */

static	void
UndrawTab(TabsWidget tw, Widget child)
{
	TabsConstraints tab = (TabsConstraints)child->core.constraints;
	Position	x = tab->tabs.x ;
	Position	y = tab->tabs.y ;
	Dimension	twid = tab->tabs.width ;
	Dimension	thgt = tw->tabs.tab_height ;
	Display		*dpy = XtDisplay((Widget)tw) ;
	Window		win = XtWindow((Widget)tw) ;
	GC		bggc = tw->tabs.backgroundGC ;

	XFillRectangle(dpy,win,bggc, x,y, twid,thgt) ;
}





	/* GEOMETRY UTILITIES */

	/* Overview:
	 *
	 *  MaxChild(): ask all children (except possibly one) their
	 *  preferred sizes, set max_cw, max_ch accordingly.
	 *
	 *  GetPreferredSizes(): ask all children their preferred sizes,
	 *  set max_cw, max_ch accordingly.
	 *
	 *  PreferredSize(): given max_cw, max_ch, return tabs widget
	 *  preferred size.  Iterate with other widths in order to get
	 *  a reasonable aspect ratio.
	 *
	 *  PreferredSize2(): Given child dimensions, return Tabs
	 *  widget dimensions.
	 *
	 *  PreferredSize3(): Same, except given child dimensions plus
	 *  shadow.
	 */


	/* Compute the width of one child's tab.  Positions will be computed
	 * elsewhere.
	 *
	 *	height: font height + vertical_space*2 + shadowWid*2
	 *	width:	string width + horizontal_space*2 + shadowWid*2
	 *
	 * All tabs are the same height, so that is computed elsewhere.
	 */

static	void
TabWidth(Widget w)
{
	TabsConstraints tab = (TabsConstraints) w->core.constraints ;
	TabsWidget	tw = (TabsWidget)XtParent(w) ;
	String		lbl = tab->tabs.label != NULL ?
				tab->tabs.label : XtName(w);
#ifdef USE_XFT_TABS
	XftFont		*font = tw->tabs.renderFont;
#else
	XFontStruct	*font = tw->tabs.font;
#endif
	int		iw = tw->tabs.internalWidth;

	tab->tabs.width = iw + SHADWID*2 ;
	tab->tabs.l_x = tab->tabs.lbm_x = SHADWID + iw ;

	if( tab->tabs.left_bitmap != None )
	{
	  tab->tabs.width += tab->tabs.lbm_width + iw ;
	  tab->tabs.l_x += tab->tabs.lbm_width + iw ;
	  tab->tabs.lbm_y = (tw->tabs.tab_height - tab->tabs.lbm_height)/2 ;
	}

	if( lbl != NULL && font != NULL )
	{
#ifdef USE_XFT_TABS
	  tab->tabs.width += x_xft_text_width (XtDisplay(tw), font,
					       (FcChar8 *) lbl,
					       (int)strlen(lbl)) + iw;
	  tab->tabs.l_y = (tw->tabs.tab_height
			   + tw->tabs.renderFont->ascent
			   /* #### how can this subtraction be correct? */
			   - tw->tabs.renderFont->descent)/2;
	  if (debug_tabs > 2)
	    fprintf (stderr, "tab:  height=%d, width=%d, baseline=%d.\n",
		     tw->tabs.tab_height, tab->tabs.width, tab->tabs.l_y);
	  if (debug_tabs > 1)
	    fprintf (stderr, "font: height=%d, ascent=%d, descent=%d.\n",
		     tw->tabs.renderFont->height,
		     tw->tabs.renderFont->ascent,
		     tw->tabs.renderFont->descent);
#else
	  tab->tabs.width += XTextWidth (font, lbl, (int)strlen(lbl)) + iw;
	  tab->tabs.l_y = (tw->tabs.tab_height +
		 tw->tabs.font->max_bounds.ascent -
		 tw->tabs.font->max_bounds.descent)/2;
#endif
	}
}



	/* Lay out tabs to fit in given width.  Compute x,y position and
	 * row number for each tab.  Return number of rows and total height
	 * required by all tabs.  If there is only one row, add TABDELTA
	 * height to the total.  Rows are assigned bottom to top.
	 *
	 * Tabs are indented from the edges by INDENT.
	 *
	 * TODO: if they require more than two rows and the total height:width
	 * ratio is more than 2:1, then try something else.
	 * Gaak!  This is actually already done in PreferredSize()!
	 *
	 * TODO SOONER: for reasons unclear, some applications (specifically
	 * XEmacs) give a nominal geometry (in the core record) which doesn't
	 * make much sense (eg, may be smaller than some of the tab children).
	 * This results in bizarre values for DISPLAY_ROWS and REPLY_HEIGHT.
	 * Specify a way to say "tell me what you really want" (eg, with WID
	 * and/or HGT == 0 or == Dimension_MAX), and use it where appropriate.
	 * LATE-BREAKING LOSE: This happens in PreferredSize(), not XEmacs!
	 *
	 * TODO EVEN SOONER: some applications lay out the tab control by
	 * repeatedly querying until a fixed width and height has been filled
	 * by the tabs (XEmacs).  There should be an API to cache this?
	 */

static	int
TabLayout(TabsWidget tw, 
	  Dimension wid,	/* if 0, use core.width as guess */
	  Dimension hgt,	/* if 0, use core.height as guess */
	  Dimension *reply_height, Bool query_only)
{
	int		i, row, done = 0, display_rows = 0 ;
	int		num_children = tw->composite.num_children ;
	Widget		*childP ;
	Dimension	w ;
	Position	x,y ;	/* #### gaak, these are dimensions! */
	TabsConstraints	tab ;

	/* Algorithm: loop through children, assign X positions.  If a tab
	 * would extend beyond the right edge, start a new row.  After all
	 * rows are assigned, make a second pass and assign Y positions.
	 */

	if( num_children > 0 )
	{
	  /* Loop through the tabs and see how much space they need. */

	  row = 0 ;
	  x = INDENT ;
	  y = 0 ;
	  /* If wid or hgt is 0, we want to guess our own dimensions.
	     Currently the guessing functions are broken....
	     #### When PreferredSize*() get fixed, fix this too. */
	  if (debug_tabs > 1)
	    fprintf (stderr, "arg=%d,", wid);
	  wid = (wid ? wid : tw->core.width) - INDENT ;
	  hgt = hgt ? hgt : tw->core.height;
	  if (debug_tabs > 1)
	    fprintf (stderr, "wid=%d: x,w,y=", wid);
	  for(i=num_children, childP=tw->composite.children; --i >= 0; ++childP)
	    if( XtIsManaged(*childP) )
	    {
	      tab = (TabsConstraints) (*childP)->core.constraints ;
	      w = tab->tabs.width ;

	      if (debug_tabs > 1)
		fprintf (stderr, "%d,%d,%d;", x, w, y);
	      if( x + w > wid ) {			/* new row */
		/* #### algorithm is not robust to wid < child's width */
		++row;
		x = INDENT ;
		y += tw->tabs.tab_height ;
 		if (y > hgt && !done)
		  {
		    display_rows = row;
		    done = 1;
		  }
	      }
	      if( !query_only ) {
		tab->tabs.x = x ;
		tab->tabs.y = y ;
		tab->tabs.row = row ;
	      }
	      x += w + SPACING ;
	      if (!query_only && !done)
		tab->tabs.visible = 1;

	    }
	  if (debug_tabs > 1)
	    fprintf (stderr, "\n");
	  /* If there was only one row, increase the height by TABDELTA */
	  if( ++display_rows == 1 )
	  {
	    y = TABDELTA ;
	    if( !query_only )
	      for(i=num_children, childP=tw->composite.children;
		    --i >= 0 ; ++childP)
		if( XtIsManaged(*childP) )
		{
		  tab = (TabsConstraints) (*childP)->core.constraints ;
		  tab->tabs.y = y ;
		}
	  }
	  row++;
	  y += tw->tabs.tab_height ;
	}
	else
	  display_rows = row = y = 0 ;

	if( !query_only ) {
	  tw->tabs.tab_total = y ;
	  tw->tabs.numRows = display_rows ;
	  tw->tabs.realRows = row;
	}

	if (debug_tabs > 1 && (row > 1 || display_rows > 1))
	  fprintf (stderr, "tab: %d display rows, #children = %d,"
		   " total height %d, total rows %d%s.\n",
		   display_rows, num_children, y, row,
		   query_only ? " (query)" : "");

	if( reply_height != NULL )
	  *reply_height = y ;

	return display_rows ;
}



	/* Find max preferred child size.  Returned sizes include child
	 * border widths.
	 */

static	void
GetPreferredSizes(TabsWidget tw)
{
	MaxChild(tw, NULL, 0,0) ;
}



	/* Find max preferred child size and store in control widget.
	 * If except is non-null, don't ask that one.
	 */

static	void
MaxChild(TabsWidget tw, Widget except, Dimension cw, Dimension ch)
{
	int			i ;
	Widget			*childP = tw->composite.children ;
	XtWidgetGeometry	preferred ;

	for(i=tw->composite.num_children; --i >=0; ++childP)
	  if( TabVisible (*childP) /*XtIsManaged(*childP)*/  &&  *childP != except )
	  {
	    (void) XtQueryGeometry(*childP, NULL, &preferred) ;
	    cw = Max(cw, preferred.width + preferred.border_width * 2 ) ;
	    ch = Max(ch, preferred.height + preferred.border_width * 2 ) ;
	  }

	tw->tabs.max_cw = cw ;
	tw->tabs.max_ch = ch ;
}



	/* rotate row numbers to bring current widget to bottom row,
	 * compute y positions for all tabs
	 */

static	void
TabsShuffleRows(TabsWidget tw)
{
	TabsConstraints	tab ;
	int		move ;
	int		real_rows, display_rows ;
	Widget		*childP ;
	Dimension	th = tw->tabs.tab_height ;
	Position	bottom ;
	int		i ;

	/* There must be a top widget.  If not, assign one. */
	if( tw->tabs.topWidget == NULL && tw->composite.children != NULL )
	  for(i=TabsNumChildren (tw), childP=tw->composite.children;
	      --i >= 0;
	      ++childP)
	    if( XtIsManaged(*childP) ) {
	      tw->tabs.topWidget = *childP ;
	      break ;
	    }

	if( tw->tabs.topWidget != NULL )
	{
	  display_rows = tw->tabs.numRows ;
	  real_rows = tw->tabs.realRows ;
	  assert( display_rows <= real_rows ) ;

	  if( real_rows > 1 )
	  {
	    tab = (TabsConstraints) tw->tabs.topWidget->core.constraints ;
	    assert( tab != NULL ) ;

	    /* How far to move top row. The selected tab must be on
	       the bottom row of the *visible* rows. */
	    move = (real_rows + 1 - display_rows) - tab->tabs.row ;
	    if (move < 0) 
	      move = real_rows - move;
	    bottom = tw->tabs.tab_total - th ;

	    for(i=tw->composite.num_children, childP=tw->composite.children;
		  --i >= 0;
		  ++childP)
	      if( XtIsManaged(*childP) )
	      {
		tab = (TabsConstraints) (*childP)->core.constraints ;
		tab->tabs.row = (tab->tabs.row + move) % real_rows ;
		tab->tabs.y = bottom - tab->tabs.row * th ;
		tab->tabs.visible = (tab->tabs.row < display_rows);
	      }
	  }
	}
}


	/* Find preferred size.  Ask children, find size of largest,
	 * add room for tabs & return.  This can get a little involved,
	 * as we don't want to have too many rows of tabs; we may widen
	 * the widget to reduce # of rows.
	 *
	 * This function requires that max_cw, max_ch already be set.
	 */
static	int
PreferredSize(
	TabsWidget	tw,
	Dimension	*reply_width,		/* total widget size */
	Dimension	*reply_height,
	Dimension	*reply_cw,		/* child widget size */
	Dimension	*reply_ch)
{
	Dimension	cw,ch ;		/* child width, height */
	Dimension	wid,hgt ;
	Dimension	rwid,rhgt ;
	int		nrow ;

	wid = cw = tw->tabs.max_cw ;
	hgt = ch = tw->tabs.max_ch ;

	nrow = PreferredSize2(tw, wid,hgt, &rwid, &rhgt) ;

	/* Check for absurd results (more than 2 rows, high aspect
	 * ratio).  Try wider size if needed.
	 * TODO: make sure this terminates.
	 */

	if( nrow > 2 && rhgt > rwid )
	{
	  Dimension w0, w1 ;
	  int maxloop = 20 ;

	  /* step 1: start doubling size until it's too big */
	  do {
	    w0 = wid ;
	    wid = Max(wid*2, wid+20) ;
	    nrow = PreferredSize2(tw, wid,hgt, &rwid,&rhgt) ;
	  } while( nrow > 2 && rhgt > rwid ) ;
	  w1 = wid ;

	  /* step 2: use Newton's method to find ideal size.  Stop within
	   * 8 pixels.
	   */
	  while( --maxloop > 0 && w1 > w0 + 8 )
	  {
	    wid = (w0+w1)/2 ;
	    nrow = PreferredSize2(tw, wid,hgt, &rwid,&rhgt) ;
	    if( nrow > 2 && rhgt > rwid )
	      w0 = wid ;
	    else
	      w1 = wid ;
	  }
	  wid = w1 ;
	}

	*reply_width = rwid ;
	*reply_height = rhgt ;
	if( reply_cw != NULL ) *reply_cw = cw ;
	if( reply_ch != NULL ) *reply_ch = ch ;
	return nrow ;
}


	/* Find preferred size, given size of children. */

static	int
PreferredSize2(
	TabsWidget	tw,
	Dimension	cw,		/* child width, height */
	Dimension	ch,
	Dimension	*reply_width,	/* total widget size */
	Dimension	*reply_height)
{
	Dimension	s = SHADWID ;
	int ret;

	/* make room for shadow frame */
	cw += s*2 ;
	ch += s*2 ;

	ret = PreferredSize3(tw, cw, ch, reply_width, reply_height) ;

	assert (*reply_width > 0 && *reply_height > 0);
	return ret;
}


	/* Find preferred size, given size of children+shadow. */

static	int
PreferredSize3(
	TabsWidget	tw,
	Dimension	wid,		/* child width, height */
	Dimension	hgt,
	Dimension	*reply_width,	/* total widget size */
	Dimension	*reply_height)
{
	Dimension	th ;		/* space used by tabs */
	int		nrows ;

	if( tw->composite.num_children > 0 )
	  /* used to be wid, hgt not 0, 0 but that's obviously wrong
	     since TabLayout wants dimensions of control parent but
	     wid, hgt are dimensions of some child */
	  nrows = TabLayout(tw, 0, 0, &th, True) ;
	else {
	  th = 0 ;
	  nrows = 0 ;
	}

	*reply_width = Max(wid, MIN_WID) ;
	*reply_height = Max(th+hgt, MIN_HGT) ;

	return nrows ;
}


static	void
MakeSizeRequest(TabsWidget tw)
{
	Widget			w = (Widget)tw ;
	XtWidgetGeometry	request, reply ;
	XtGeometryResult	result ;
	Dimension		cw,ch ;

	request.request_mode = CWWidth | CWHeight ;
	PreferredSize(tw, &request.width, &request.height, &cw, &ch) ;

	if( request.width == tw->core.width &&
	    request.height == tw->core.height )
	  return ;

	result = XtMakeGeometryRequest(w, &request, &reply) ;

	if( result == XtGeometryAlmost )
	{
	  /* Bugger.  Didn't get what we want, but were offered a
	   * compromise.  If the width was too small, recompute
	   * based on the too-small width and try again.
	   * If the height was too small, make a wild-ass guess
	   * at a wider width and try again.
	   */

	  if( reply.width < request.width && reply.height >= request.height )
	  {
	    Dimension s = SHADWID ;
	    ch += s*2 ;
	    PreferredSize3(tw, reply.width,ch, &request.width, &request.height);
	    result = XtMakeGeometryRequest(w, &request, &reply) ;
	    if( result == XtGeometryAlmost )
	      (void) XtMakeGeometryRequest(w, &reply, NULL) ;
	  }

	  else
	    (void) XtMakeGeometryRequest(w, &reply, NULL) ;
	}
}


static	void
getBitmapInfo(TabsWidget tw, TabsConstraints tab)
{
	Window root ;
	int	x,y ;
	unsigned int bw ;

	if( tab->tabs.left_bitmap == None  ||
	    !XGetGeometry(XtDisplay(tw), tab->tabs.left_bitmap, &root, &x, &y,
		&tab->tabs.lbm_width, &tab->tabs.lbm_height,
		&bw, &tab->tabs.lbm_depth) )
	  tab->tabs.lbm_width = tab->tabs.lbm_height = 0 ;
}




	/* Code copied & modified from Gcs.c.  This version has dynamic
	 * foreground.
	 */

static	void
TabsAllocFgGC(TabsWidget tw)
{
	Widget		w = (Widget) tw;
	XGCValues	values ;

	values.background = tw->core.background_pixel;
	values.font =
#ifdef USE_XFT_TABS
	  None;
#else
	  tw->tabs.font->fid;
#endif
	values.line_style = LineOnOffDash;
	values.line_style = LineSolid;

	tw->tabs.foregroundGC =
	  XtAllocateGC(w, w->core.depth,
#ifndef USE_XFT_TABS
		       GCFont|
#endif
		       GCBackground|GCLineStyle,
		       &values,
		       GCForeground,
#ifdef USE_XFT_TABS
		       GCFont|
#endif
		       GCSubwindowMode|GCGraphicsExposures|GCDashOffset|
		       GCDashList|GCArcMode);
}

static	void
TabsAllocGreyGC(TabsWidget tw)
{
	Widget		w = (Widget) tw;
	XGCValues	values ;

	values.background = tw->core.background_pixel;
	values.font =
#ifdef USE_XFT_TABS
	  None;
#else
	  tw->tabs.font->fid;
#endif
#ifdef HAVE_XMU
	if (tw->tabs.be_nice_to_cmap || w->core.depth == 1)
	{
	  values.fill_style = FillStippled;
	  tw->tabs.grey50 =
	  values.stipple = XmuCreateStippledPixmap(XtScreen(w), 1L, 0L, 1);

	  tw->tabs.greyGC =
	    XtAllocateGC(w, w->core.depth,
#ifndef USE_XFT_TABS
	      GCFont|
#endif
	      GCBackground|GCStipple|GCFillStyle, &values,
	      GCForeground,
#ifdef USE_XFT_TABS
	      GCFont|
#endif
	      GCSubwindowMode|GCGraphicsExposures|GCDashOffset|
		  GCDashList|GCArcMode);
	}
	else
#endif
	{
	  tw->tabs.greyGC =
	    XtAllocateGC(w, w->core.depth,
#ifdef USE_XFT_TABS
	      0L,
#else
	      GCFont,
#endif
	      &values,
	      GCForeground,
#ifdef USE_XFT_TABS
	      GCFont|
#endif
	      GCBackground|GCSubwindowMode|GCGraphicsExposures|GCDashOffset|
		  GCDashList|GCArcMode);
	}
}
