/* 
 * tkMacButton.c --
 *
 *	This file implements the Macintosh specific portion of the
 *	button widgets.
 *
 * Copyright (c) 1996-1997 by Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkMacButton.c,v 1.10.2.1 2001/04/04 21:39:48 hobbs Exp $
 */

#include "tkButton.h"
#include "tkMacInt.h"
#include <Controls.h>
#include <ControlDefinitions.h>
#include <LowMem.h>
#include <Appearance.h>


#include <ToolUtils.h>

/*
 * Some defines used to control what type of control is drawn.
 */

#define DRAW_LABEL	0		/* Labels are treated genericly. */
#define DRAW_CONTROL	1		/* Draw using the Native control. */
#define DRAW_CUSTOM	2		/* Make our own button drawing. */
#define DRAW_BEVEL	3

/*
 * The following structures are used to draw our controls.  Rather than
 * having many Mac controls we just use one control of each type and
 * reuse them for all Tk widgets.  When the windowRef variable is NULL
 * it means none of the data structures have been allocated.
 */

static WindowRef windowRef = NULL;
static CWindowRecord windowRecord;
static ControlRef buttonHandle;
static ControlRef checkHandle;
static ControlRef radioHandle;
static ControlRef smallBevelHandle;
static ControlRef smallStickyBevelHandle;
static ControlRef medBevelHandle;
static ControlRef medStickyBevelHandle;
static ControlRef largeBevelHandle;
static ControlRef largeStickyBevelHandle;

/*
 * These are used to store the image content for
 * beveled buttons - i.e. buttons with images.
 */
 
static ControlButtonContentInfo bevelButtonContent;
static OpenCPicParams picParams;

static CCTabHandle buttonTabHandle;
static CCTabHandle checkTabHandle;
static CCTabHandle radioTabHandle;
static PixMapHandle oldPixPtr;

/*
 * These functions are used when Appearance is present.
 * By embedding all our controls in a userPane control,
 * we can color the background of the text in radiobuttons
 * and checkbuttons.  Thanks to Peter Gontier of Apple DTS
 * for help on this one.
 */

static ControlRef userPaneHandle;
static RGBColor gUserPaneBackground = { ~0, ~0, ~0};
static pascal OSErr SetUserPaneDrawProc(ControlRef control,
	ControlUserPaneDrawProcPtr upp);
static pascal OSErr SetUserPaneSetUpSpecialBackgroundProc(ControlRef control,
	ControlUserPaneBackgroundProcPtr upp);
static pascal void UserPaneDraw(ControlRef control, ControlPartCode cpc);
static pascal void UserPaneBackgroundProc(ControlHandle,
	ControlBackgroundPtr info);

/*
 * Forward declarations for procedures defined later in this file:
 */

static void		ButtonEventProc _ANSI_ARGS_((
			    ClientData clientData, XEvent *eventPtr));
static int	UpdateControlColors _ANSI_ARGS_((TkButton *butPtr,
	ControlRef controlHandle, CCTabHandle ccTabHandle,
	RGBColor *saveColorPtr));
static void	DrawBufferedControl _ANSI_ARGS_((TkButton *butPtr,
	GWorldPtr destPort, GC gc, Pixmap pixmap));
static void	InitSampleControls();
static void	SetupBevelButton _ANSI_ARGS_((TkButton *butPtr,
	ControlRef controlHandle, 
	GWorldPtr destPort, GC gc, Pixmap pixmap));
static void	ChangeBackgroundWindowColor _ANSI_ARGS_((
    WindowRef macintoshWindow, RGBColor rgbColor,
    RGBColor *oldColor));
static void	ButtonExitProc _ANSI_ARGS_((ClientData clientData));

/*
 * The class procedure table for the button widgets.
 */

TkClassProcs tkpButtonProcs = { 
    NULL,			/* createProc. */
    TkButtonWorldChanged,	/* geometryProc. */
    NULL			/* modalProc. */
};

/*
 *----------------------------------------------------------------------
 *
 * TkpCreateButton --
 *
 *	Allocate a new TkButton structure.
 *
 * Results:
 *	Returns a newly allocated TkButton structure.
 *
 * Side effects:
 *	Registers an event handler for the widget.
 *
 *----------------------------------------------------------------------
 */

TkButton *
TkpCreateButton(
    Tk_Window tkwin)
{
    TkButton *buttonPtr;
    buttonPtr = (TkButton *) ckalloc(sizeof(TkButton));
    Tk_CreateEventHandler(tkwin, ActivateMask,
	    ButtonEventProc, (ClientData) buttonPtr);
    return buttonPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpDisplayButton --
 *
 *	This procedure is invoked to display a button widget.  It is
 *	normally invoked as an idle handler.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Commands are output to X to display the button in its
 *	current mode.  The REDRAW_PENDING flag is cleared.
 *
 *----------------------------------------------------------------------
 */

void
TkpDisplayButton(
    ClientData clientData)	/* Information about widget. */
{
    TkButton *butPtr = (TkButton *) clientData;
    Pixmap pixmap;
    GC gc;
    Tk_3DBorder border;
    int x = 0;			/* Initialization only needed to stop
				 * compiler warning. */
    int y, relief;
    register Tk_Window tkwin = butPtr->tkwin;
    int width, height;
    int offset;			/* 0 means this is a normal widget.  1 means
				 * it is an image button, so we offset the
				 * image to make the button appear to move
				 * up and down as the relief changes. */
    int hasImageOrBitmap;
    CGrafPtr saveWorld;
    GDHandle saveDevice;
    GWorldPtr destPort;
    int drawType, borderWidth;

    GetGWorld(&saveWorld, &saveDevice);

    butPtr->flags &= ~REDRAW_PENDING;
    if ((butPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
	return;
    }

    /*
     * In order to avoid screen flashes, this procedure redraws
     * the button in a pixmap, then copies the pixmap to the
     * screen in a single operation.  This means that there's no
     * point in time where the on-sreen image has been cleared.
     */

    pixmap = Tk_GetPixmap(butPtr->display, Tk_WindowId(tkwin),
	    Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));

    hasImageOrBitmap = ((butPtr->image != NULL) || (butPtr->bitmap != None));
    offset = (butPtr->type == TYPE_BUTTON) && hasImageOrBitmap;

    border = butPtr->normalBorder;
    if ((butPtr->state == STATE_DISABLED) && (butPtr->disabledFg != NULL)) {
	gc = butPtr->disabledGC;
    } else if ((butPtr->type == TYPE_BUTTON)
	    && (butPtr->state == STATE_ACTIVE)) {
	gc = butPtr->activeTextGC;
	border = butPtr->activeBorder;
    } else {
	gc = butPtr->normalTextGC;
    }
    
    if ((butPtr->flags & SELECTED) && (butPtr->state != STATE_ACTIVE)
	    && (butPtr->selectBorder != NULL) && !butPtr->indicatorOn) {
	border = butPtr->selectBorder;
    }

    /*
     * Override the relief specified for the button if this is a
     * checkbutton or radiobutton and there's no indicator.
     * However, don't do this in the presence of Appearance, since
     * then the bevel button will take care of the relief.
     */

    relief = butPtr->relief;

    if ((butPtr->type >= TYPE_CHECK_BUTTON) && !butPtr->indicatorOn) { 
	if (!TkMacHaveAppearance() || !hasImageOrBitmap) {
	    relief = (butPtr->flags & SELECTED) ? TK_RELIEF_SUNKEN
		: TK_RELIEF_RAISED;
	}
    }

    /*
     * See the comment in UpdateControlColors as to why we use the 
     * highlightbackground for the border of Macintosh buttons.
     */
     
    if (butPtr->type == TYPE_BUTTON) {
	Tk_Fill3DRectangle(tkwin, pixmap, butPtr->highlightBorder, 0, 0,
		Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);
    } else {
	Tk_Fill3DRectangle(tkwin, pixmap, butPtr->normalBorder, 0, 0,
		Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);
    }
   
    if (butPtr->type == TYPE_LABEL) {
	drawType = DRAW_LABEL;
    } else if (butPtr->type == TYPE_BUTTON) {
	if (!hasImageOrBitmap) {
	    drawType = DRAW_CONTROL;
	} else if (butPtr->image != None) {
	    drawType = DRAW_BEVEL;
	} else {
	    /*
	     * TO DO - The current way the we draw bitmaps (XCopyPlane)
	     * uses CopyDeepMask in this one case.  The Picture recording 
	     * does not record this call, and so we can't use the
	     * Appearance bevel button here.  The only case that would
	     * exercise this is if you use a bitmap, with
	     * -data & -mask specified.	 We should probably draw the 
	     * appearance button and overprint the image in this case.
	     * This just punts and draws the old-style, ugly, button.
	     */
	     
	    if (gc->clip_mask == 0) {
		drawType = DRAW_BEVEL;
	    } else {
		TkpClipMask *clipPtr = (TkpClipMask*) gc->clip_mask;
		if ((clipPtr->type == TKP_CLIP_PIXMAP) &&
			(clipPtr->value.pixmap != butPtr->bitmap)) {
		    drawType = DRAW_CUSTOM;
		} else {
		    drawType = DRAW_BEVEL;
		}
	    }
	}
    } else {
	if (butPtr->indicatorOn) {
	    drawType = DRAW_CONTROL;
	} else if (hasImageOrBitmap) {
	    if (gc->clip_mask == 0) {
		drawType = DRAW_BEVEL;
	    } else {
		TkpClipMask *clipPtr = (TkpClipMask*) gc->clip_mask;
		if ((clipPtr->type == TKP_CLIP_PIXMAP) &&
			(clipPtr->value.pixmap != butPtr->bitmap)) {
		    drawType = DRAW_CUSTOM;
		} else {
		    drawType = DRAW_BEVEL;
		}
	    }
	} else {
	    drawType = DRAW_CUSTOM;
	}
    }

    /*
     * Draw the native portion of the buttons.	Start by creating the control
     * if it doesn't already exist.  Then configure the Macintosh control from
     * the Tk info.  Finally, we call Draw1Control to draw to the screen.
     */

    if ((drawType == DRAW_CONTROL) || 
	    ((drawType == DRAW_BEVEL) && TkMacHaveAppearance())) {
	borderWidth = 0;
	
	/*
	 * This part uses Macintosh rather than Tk calls to draw
	 * to the screen.  Make sure the ports etc. are set correctly.
	 */
	
	destPort = TkMacGetDrawablePort(pixmap);
	SetGWorld(destPort, NULL);
	DrawBufferedControl(butPtr, destPort, gc, pixmap);
    }

    if ((drawType == DRAW_CUSTOM) || (drawType == DRAW_LABEL)) {
	borderWidth = butPtr->borderWidth;
    }

    /*
     * Display image or bitmap or text for button.  This has
     * already been done under Appearance with the Bevel
     * button types.
     */

    if ((drawType == DRAW_BEVEL) && TkMacHaveAppearance()) {
	/* Empty Body */
    } else if (butPtr->image != None) {
	Tk_SizeOfImage(butPtr->image, &width, &height);

	imageOrBitmap:
	TkComputeAnchor(butPtr->anchor, tkwin, 0, 0,
		butPtr->indicatorSpace + width, height, &x, &y);
	x += butPtr->indicatorSpace;

	x += offset;
	y += offset;
	if (relief == TK_RELIEF_RAISED) {
	    x -= offset;
	    y -= offset;
	} else if (relief == TK_RELIEF_SUNKEN) {
	    x += offset;
	    y += offset;
	}
	if (butPtr->image != NULL) {
	    if ((butPtr->selectImage != NULL) && (butPtr->flags & SELECTED)) {
		Tk_RedrawImage(butPtr->selectImage, 0, 0, width, height,
			pixmap, x, y);
	    } else {
		Tk_RedrawImage(butPtr->image, 0, 0, width, height, pixmap,
			x, y);
	    }
	} else {
	    XSetClipOrigin(butPtr->display, gc, x, y);
	    XCopyPlane(butPtr->display, butPtr->bitmap, pixmap, gc, 0, 0,
		    (unsigned int) width, (unsigned int) height, x, y, 1);
	    XSetClipOrigin(butPtr->display, gc, 0, 0);
	}
	y += height/2;
    } else if (butPtr->bitmap != None) {
	Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, &width, &height);
	goto imageOrBitmap;
    } else {
	TkComputeAnchor(butPtr->anchor, tkwin, butPtr->padX, butPtr->padY,
		butPtr->indicatorSpace + butPtr->textWidth, butPtr->textHeight,
		&x, &y);

	x += butPtr->indicatorSpace;

	Tk_DrawTextLayout(butPtr->display, pixmap, gc, butPtr->textLayout,
		x, y, 0, -1);
	y += butPtr->textHeight/2;
    }

    /*
     * If the button is disabled with a stipple rather than a special
     * foreground color, generate the stippled effect.	If the widget
     * is selected and we use a different background color when selected,
     * must temporarily modify the GC.
     */

    if ((butPtr->state == STATE_DISABLED)
	    && ((butPtr->disabledFg == NULL) || (butPtr->image != NULL))) {
	if ((butPtr->flags & SELECTED) && !butPtr->indicatorOn
		&& (butPtr->selectBorder != NULL)) {
	    XSetForeground(butPtr->display, butPtr->disabledGC,
		    Tk_3DBorderColor(butPtr->selectBorder)->pixel);
	}
	XFillRectangle(butPtr->display, pixmap, butPtr->disabledGC,
		butPtr->inset, butPtr->inset,
		(unsigned) (Tk_Width(tkwin) - 2*butPtr->inset),
		(unsigned) (Tk_Height(tkwin) - 2*butPtr->inset));
	if ((butPtr->flags & SELECTED) && !butPtr->indicatorOn
		&& (butPtr->selectBorder != NULL)) {
	    XSetForeground(butPtr->display, butPtr->disabledGC,
		    Tk_3DBorderColor(butPtr->normalBorder)->pixel);
	}
    }

    /*
     * Draw the border and traversal highlight last.  This way, if the
     * button's contents overflow they'll be covered up by the border.
     */

    if (relief != TK_RELIEF_FLAT) {
	int inset = butPtr->highlightWidth;
	Tk_Draw3DRectangle(tkwin, pixmap, border, inset, inset,
		Tk_Width(tkwin) - 2*inset, Tk_Height(tkwin) - 2*inset,
		butPtr->borderWidth, relief);
    }

    /*
     * Copy the information from the off-screen pixmap onto the screen,
     * then delete the pixmap.
     */

    XCopyArea(butPtr->display, pixmap, Tk_WindowId(tkwin),
	    butPtr->copyGC, 0, 0, (unsigned) Tk_Width(tkwin),
	    (unsigned) Tk_Height(tkwin), 0, 0);
    Tk_FreePixmap(butPtr->display, pixmap);

    SetGWorld(saveWorld, saveDevice);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpComputeButtonGeometry --
 *
 *	After changes in a button's text or bitmap, this procedure
 *	recomputes the button's geometry and passes this information
 *	along to the geometry manager for the window.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The button's window may change size.
 *
 *----------------------------------------------------------------------
 */

void
TkpComputeButtonGeometry(
    TkButton *butPtr)	/* Button whose geometry may have changed. */
{
    int width, height, avgWidth;
    Tk_FontMetrics fm;


    /*
     * First figure out the size of the contents of the button.
     */
     
    butPtr->indicatorSpace = 0;
    if (butPtr->image != NULL) {
	Tk_SizeOfImage(butPtr->image, &width, &height);
	imageOrBitmap:
	if (butPtr->width > 0) {
	    width = butPtr->width;
	}
	if (butPtr->height > 0) {
	    height = butPtr->height;
	}
	if ((butPtr->type >= TYPE_CHECK_BUTTON) && butPtr->indicatorOn) {
	    butPtr->indicatorSpace = height;
	    if (butPtr->type == TYPE_CHECK_BUTTON) {
		butPtr->indicatorDiameter = (65*height)/100;
	    } else {
		butPtr->indicatorDiameter = (75*height)/100;
	    }
	}
    } else if (butPtr->bitmap != None) {
	Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, &width, &height);
	goto imageOrBitmap;
    } else {
	Tk_FreeTextLayout(butPtr->textLayout);
	butPtr->textLayout = Tk_ComputeTextLayout(butPtr->tkfont,
		Tcl_GetString(butPtr->textPtr), -1, butPtr->wrapLength,
		butPtr->justify, 0, &butPtr->textWidth, &butPtr->textHeight);

	width = butPtr->textWidth;
	height = butPtr->textHeight;
	avgWidth = Tk_TextWidth(butPtr->tkfont, "0", 1);
	Tk_GetFontMetrics(butPtr->tkfont, &fm);

	if (butPtr->width > 0) {
	    width = butPtr->width * avgWidth;
	}
	if (butPtr->height > 0) {
	    height = butPtr->height * fm.linespace;
	}
	if ((butPtr->type >= TYPE_CHECK_BUTTON) && butPtr->indicatorOn) {
	    butPtr->indicatorDiameter = fm.linespace;
	    if (butPtr->type == TYPE_CHECK_BUTTON) {
		butPtr->indicatorDiameter = (80*butPtr->indicatorDiameter)/100;
	    }
	    butPtr->indicatorSpace = butPtr->indicatorDiameter + avgWidth;
	}
    }

    /*
     * Now figure out the size of the border decorations for the button.
     */
     
    if (butPtr->highlightWidth < 0) {
	butPtr->highlightWidth = 0;
    }
    
    /*
     * The width and height calculation for Appearance buttons with images & 
     * non-Appearance buttons with images is different.	 In the latter case, 
     * we add the borderwidth to the inset, since we are going to stamp a
     * 3-D border over the image.  In the former, we add it to the height,
     * directly, since Appearance will draw the border as part of our control.
     *
     * When issuing the geometry request, add extra space for the indicator,
     * if any, and for the border and padding, plus if this is an image two 
     * extra pixels so the display can be offset by 1 pixel in either
     * direction for the raised or lowered effect.
     *
     * The highlight width corresponds to the default ring on the Macintosh.
     * As such, the highlight width is only added if the button is the default
     * button.	The actual width of the default ring is one less than the
     * highlight width as there is also one pixel of spacing.
     * Appearance buttons with images do not have a highlight ring, because the 
     * Bevel button type does not support one.
     */

    if ((butPtr->image == None) && (butPtr->bitmap == None)) {
	width += 2*butPtr->padX;
	height += 2*butPtr->padY;
    }
    
    if ((butPtr->type == TYPE_BUTTON)) {
	if ((butPtr->image == None) && (butPtr->bitmap == None)) {
	    butPtr->inset = 0;
	    if (butPtr->defaultState != STATE_DISABLED) {
		butPtr->inset += butPtr->highlightWidth;
	    }
	} else if (TkMacHaveAppearance()) {
	    butPtr->inset = 0;
	    width += (2 * butPtr->borderWidth + 4);
	    height += (2 * butPtr->borderWidth + 4);
	} else {
	    butPtr->inset = butPtr->borderWidth;
	    width += 2;
	    height += 2;
	    if (butPtr->defaultState != STATE_DISABLED) {
		butPtr->inset += butPtr->highlightWidth;
	    }
	}
    } else if ((butPtr->type != TYPE_LABEL)) {
	if (butPtr->indicatorOn) {
	    butPtr->inset = 0;
	} else {
	    /*
	     * Under Appearance, the Checkbutton or radiobutton with an image
	     * is represented by a BevelButton with the Sticky defProc...  
	     * So we must set its height in the same way as the Button 
	     * with an image or bitmap.
	     */
	    if (((butPtr->image != None) || (butPtr->bitmap != None))
		    && TkMacHaveAppearance()) {
		int border;
		butPtr->inset = 0;
		if ( butPtr->borderWidth <= 2 ) {
		    border = 6;
		}  else {
		    border = 2 * butPtr->borderWidth + 2;
		}	       
		width += border;
		height += border;
	    } else {
		butPtr->inset = butPtr->borderWidth;
	    }	
	}	
    } else {
	butPtr->inset = butPtr->borderWidth;
    }



    Tk_GeometryRequest(butPtr->tkwin, (int) (width + butPtr->indicatorSpace
	    + 2*butPtr->inset), (int) (height + 2*butPtr->inset));
    Tk_SetInternalBorder(butPtr->tkwin, butPtr->inset);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpDestroyButton --
 *
 *	Free data structures associated with the button control.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Restores the default control state.
 *
 *----------------------------------------------------------------------
 */

void
TkpDestroyButton(
    TkButton *butPtr)
{
    /* Do nothing. */
}

/*
 *--------------------------------------------------------------
 *
 * DrawBufferedControl --
 *
 *	This function uses a dummy Macintosh window to allow
 *	drawing Mac controls to any GWorld (including off-screen
 *	bitmaps).  In addition, this code may apply custom
 *	colors passed in the TkButton.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Control is to the GWorld.  Static state created on
 *	first invocation of this routine.
 *
 *--------------------------------------------------------------
 */

static void
DrawBufferedControl(
    TkButton *butPtr,		/* Tk button. */
    GWorldPtr destPort,		/* Off screen GWorld. */
    GC gc,			/* The GC we are drawing into - needed for
				 * the bevel button */
    Pixmap pixmap		/* The pixmap we are drawing into - needed
				   for the bevel button */
    )		
{
    ControlRef controlHandle;
    CCTabHandle ccTabHandle;
    int windowColorChanged = false;
    RGBColor saveBackColor;
    int isBevel = 0;
   
    if (windowRef == NULL) {
	InitSampleControls();
    }
    
    /*
     * Now swap in the passed in GWorld for the portBits of our fake
     * window.	We also adjust various fields in the WindowRecord to make
     * the system think this is a normal window.
     * Note, we can use DrawControlInCurrentPort under Appearance, so we don't
     * need to swap pixmaps.
     */
    
    if (!TkMacHaveAppearance()) {
	((CWindowPeek) windowRef)->port.portPixMap = destPort->portPixMap;
    }
    
    ((CWindowPeek) windowRef)->port.portRect = destPort->portRect;
    RectRgn(((CWindowPeek) windowRef)->port.visRgn, &destPort->portRect);
    RectRgn(((CWindowPeek) windowRef)->strucRgn, &destPort->portRect);
    RectRgn(((CWindowPeek) windowRef)->updateRgn, &destPort->portRect);
    RectRgn(((CWindowPeek) windowRef)->contRgn, &destPort->portRect);
    PortChanged(windowRef);
    
    /*
     * Set up control in hidden window to match what we need
     * to draw in the buffered window.	
     */
     
    isBevel = 0;   
    switch (butPtr->type) {
	case TYPE_BUTTON:
	    if (TkMacHaveAppearance()) {
		if ((butPtr->image == None) && (butPtr->bitmap == None)) {
		    controlHandle = buttonHandle;
		    ccTabHandle = buttonTabHandle;
		} else {
		    if (butPtr->borderWidth <= 2) {
			controlHandle = smallBevelHandle;
		    } else if (butPtr->borderWidth == 3) {
			controlHandle = medBevelHandle;
		    } else {
			controlHandle = largeBevelHandle;
		    }
		    ccTabHandle = buttonTabHandle;
		    SetupBevelButton(butPtr, controlHandle, destPort, 
			    gc, pixmap);
		    isBevel = 1;		
		}
	    } else {
		controlHandle = buttonHandle;
		ccTabHandle = buttonTabHandle;
	    }
	    break;
	case TYPE_RADIO_BUTTON:
	    if (TkMacHaveAppearance()) {
		if (((butPtr->image == None) && (butPtr->bitmap == None))
			|| (butPtr->indicatorOn)) {
		    controlHandle = radioHandle;
		    ccTabHandle = radioTabHandle;
		} else {
		    if (butPtr->borderWidth <= 2) {
			controlHandle = smallStickyBevelHandle;
		    } else if (butPtr->borderWidth == 3) {
			controlHandle = medStickyBevelHandle;
		    } else {
			controlHandle = largeStickyBevelHandle;
		    }
		    ccTabHandle = radioTabHandle;
		    SetupBevelButton(butPtr, controlHandle, destPort, 
			    gc, pixmap);
		    isBevel = 1;		
		}
	    } else {
		controlHandle = radioHandle;
		ccTabHandle = radioTabHandle;
	    }	       
	    break;
	case TYPE_CHECK_BUTTON:
	    if (TkMacHaveAppearance()) {
		if (((butPtr->image == None) && (butPtr->bitmap == None))
			|| (butPtr->indicatorOn)) {
		    controlHandle = checkHandle;
		    ccTabHandle = checkTabHandle;
		} else {
		    if (butPtr->borderWidth <= 2) {
			controlHandle = smallStickyBevelHandle;
		    } else if (butPtr->borderWidth == 3) {
			controlHandle = medStickyBevelHandle;
		    } else {
			controlHandle = largeStickyBevelHandle;
		    }
		    ccTabHandle = checkTabHandle;
		    SetupBevelButton(butPtr, controlHandle, destPort, 
			    gc, pixmap);
		    isBevel = 1;		
		}
	    } else {
		controlHandle = checkHandle;
		ccTabHandle = checkTabHandle;
	    }	       
	    break;
    }
    
    (**controlHandle).contrlRect.left = butPtr->inset;
    (**controlHandle).contrlRect.top = butPtr->inset;
    (**controlHandle).contrlRect.right = Tk_Width(butPtr->tkwin) 
	- butPtr->inset;
    (**controlHandle).contrlRect.bottom = Tk_Height(butPtr->tkwin) 
	- butPtr->inset;
	    
    /*
     * Setting the control visibility by hand does not 
     * seem to work under Appearance. 
     */
     
    if (TkMacHaveAppearance()) {
	SetControlVisibility(controlHandle, true, false);      
	(**userPaneHandle).contrlRect.left = 0;
	(**userPaneHandle).contrlRect.top = 0;
	(**userPaneHandle).contrlRect.right = Tk_Width(butPtr->tkwin);
	(**userPaneHandle).contrlRect.bottom = Tk_Height(butPtr->tkwin);
    } else {	  
	(**controlHandle).contrlVis = 255;
    }	  
    
		
    
    if (butPtr->flags & SELECTED) {
	(**controlHandle).contrlValue = 1;
    } else {
	(**controlHandle).contrlValue = 0;
    }
    
    if (!tkMacAppInFront || butPtr->state == STATE_DISABLED) {
	(**controlHandle).contrlHilite = kControlInactivePart;
    } else if (butPtr->state == STATE_ACTIVE) {
	if (isBevel) {
	    (**controlHandle).contrlHilite = kControlButtonPart;
	} else {
	    switch (butPtr->type) {
		case TYPE_BUTTON:
		    (**controlHandle).contrlHilite = kControlButtonPart;
		    break;
		case TYPE_RADIO_BUTTON:
		    (**controlHandle).contrlHilite = kControlRadioButtonPart;
		    break;
		case TYPE_CHECK_BUTTON:
		    (**controlHandle).contrlHilite = kControlCheckBoxPart;
		    break;
	    }
	}
    } else {
	(**controlHandle).contrlHilite = kControlNoPart;
    }
    /*
     * Before we draw the control we must add the hidden window back to the
     * main window list.  Otherwise, radiobuttons and checkbuttons will draw
     * incorrectly.  I don't really know why - but clearly the control draw
     * proc needs to have the controls window in the window list.  This is not
     * necessary under Appearance, and will have to go when we Carbonize Tk...
     */
    if (!TkMacHaveAppearance()) {
        ((CWindowPeek) windowRef)->nextWindow = (CWindowPeek) LMGetWindowList();
        LMSetWindowList(windowRef);
    }

    /*
     * Now we can set the port to our doctered up window.  We next need
     * to muck with the colors for the port & window to draw the control
     * with the proper Tk colors.  If we need to we also draw a default
     * ring for buttons.
     * Under Appearance, we draw the control directly into destPort, and
     * just set the default control data.
     */

    if (TkMacHaveAppearance()) {
	SetPort((GrafPort *) destPort);
    } else {
	SetPort(windowRef);
    }

    windowColorChanged = UpdateControlColors(butPtr, controlHandle, 
	    ccTabHandle, &saveBackColor);
	
    if ((butPtr->type == TYPE_BUTTON) && TkMacHaveAppearance()) {
	Boolean isDefault;
	
	if (butPtr->defaultState == STATE_ACTIVE) {
	    isDefault = true;
	} else {
	    isDefault = false;
	}
	SetControlData(controlHandle, kControlNoPart, 
		kControlPushButtonDefaultTag,
		sizeof(isDefault), (Ptr) &isDefault);			
    }

    if (TkMacHaveAppearance()) {
	DrawControlInCurrentPort(userPaneHandle);
    } else {
	Draw1Control(controlHandle);
    }

    if (!TkMacHaveAppearance() &&
	    (butPtr->type == TYPE_BUTTON) && 
	    (butPtr->defaultState == STATE_ACTIVE)) {
	Rect box = (**controlHandle).contrlRect;
	RGBColor rgbColor;

	TkSetMacColor(butPtr->highlightColorPtr->pixel, &rgbColor);
	RGBForeColor(&rgbColor);
	PenSize(butPtr->highlightWidth - 1, butPtr->highlightWidth - 1);
	InsetRect(&box, -butPtr->highlightWidth, -butPtr->highlightWidth);
	FrameRoundRect(&box, 16, 16);
    }
    
    if (windowColorChanged) {
	RGBColor dummyColor;
	ChangeBackgroundWindowColor(windowRef, saveBackColor, &dummyColor);
    }
    
    /*
     * Clean up: remove the hidden window from the main window list, and
     * hide the control we drew.  
     */

    if (TkMacHaveAppearance()) {
	SetControlVisibility(controlHandle, false, false);
	if (isBevel) {
	    KillPicture(bevelButtonContent.u.picture);
	}     
    } else {	  
	(**controlHandle).contrlVis = 0;
    }	  
    if (!TkMacHaveAppearance()) {    
        LMSetWindowList((WindowRef) ((CWindowPeek) windowRef)->nextWindow);
    }
}

/*
 *--------------------------------------------------------------
 *
 * InitSampleControls --
 *
 *	This function initializes a dummy Macintosh window and
 *	sample controls to allow drawing Mac controls to any GWorld 
 *	(including off-screen bitmaps).	 
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Controls & a window are created.
 *
 *--------------------------------------------------------------
 */

static void
InitSampleControls()
{
    Rect geometry = {0, 0, 10, 10};
    CWindowPeek windowList;
    GWorldPtr frontWin = NULL;
    TkMacWindowList *winListPtr;

    /*
     * Create a dummy window that we can draw to.  We will
     * actually replace this window's bitmap with the one
     * we want to draw to at a later time.  This window and
     * the data structures attached to it are only deallocated
     * on exit of the application.
     */

    /* 
     * This is a bit of a hack...  The problem is that under appearance,
     * taking a window out of the window list causes instability, so we can't 
     * do that.  OTOH, we need to make sure that this window is NEVER the front
     * window, or we may inadvertently send keystrokes to it...
     * So we put it BEHIND ".", and then we won't ever be able to destroy
     * ALL the windows that are above it.
     */
      
    for (winListPtr = tkMacWindowListPtr; winListPtr != NULL; 
            winListPtr = winListPtr->nextPtr) {
        frontWin = ((MacDrawable *) tkMacWindowListPtr->winPtr->privatePtr)->portPtr;
        if (strcmp(tkMacWindowListPtr->winPtr->pathName, ".") == 0) {
            break;
        }
    }
    
    windowRef = NewCWindow(NULL, &geometry, "\pempty", false, 
	    zoomDocProc, (WindowRef) frontWin, true, 0);
    if (windowRef == NULL) {
	panic("Can't allocate buffer window.");
    }
	
    /*
     * Now add the three standard controls to hidden window.  We
     * only create one of each and reuse them for every widget in
     * Tk.
     * Under Appearance, we have to embed the controls in a UserPane
     * control, so that we can color the background text in 
     * radiobuttons and checkbuttons.
     */
	
    SetPort(windowRef);
	
    if (TkMacHaveAppearance()) {
	    
	OSErr err;
	ControlRef dontCare;
	    
 	/* 
 	 * Adding UserPaneBackgroundProcs to the root control does
	 * not seem to work, so we have to add another UserPane to 
	 * the root control.
	 */
	     
	err = CreateRootControl(windowRef, &dontCare);
	if (err != noErr) {
	    panic("Can't create root control in DrawBufferedControl");
	}
	    
	userPaneHandle = NewControl(windowRef, &geometry, "\p",
		true, kControlSupportsEmbedding|kControlHasSpecialBackground, 
		0, 1, kControlUserPaneProc, (SInt32) 0);
	SetUserPaneSetUpSpecialBackgroundProc(userPaneHandle,
		UserPaneBackgroundProc);
	SetUserPaneDrawProc(userPaneHandle, UserPaneDraw);

	buttonHandle = NewControl(windowRef, &geometry, "\p",
		false, 1, 0, 1, kControlPushButtonProc, (SInt32) 0);
	EmbedControl(buttonHandle, userPaneHandle);
	checkHandle = NewControl(windowRef, &geometry, "\p",
		false, 1, 0, 1, kControlCheckBoxProc, (SInt32) 0);
	EmbedControl(checkHandle, userPaneHandle);
	radioHandle = NewControl(windowRef, &geometry, "\p",
		false, 1, 0, 1, kControlRadioButtonProc, (SInt32) 0);
	EmbedControl(radioHandle, userPaneHandle);
	smallBevelHandle = NewControl(windowRef, &geometry, "\p",
		false, 0, 0, 
		kControlBehaviorOffsetContents << 16
		| kControlContentPictHandle, 
		kControlBevelButtonSmallBevelProc, (SInt32) 0);
	EmbedControl(smallBevelHandle, userPaneHandle);
	medBevelHandle = NewControl(windowRef, &geometry, "\p",
		false, 0, 0, 
		kControlBehaviorOffsetContents << 16
		| kControlContentPictHandle, 
		kControlBevelButtonNormalBevelProc, (SInt32) 0);
	EmbedControl(medBevelHandle, userPaneHandle);
	largeBevelHandle = NewControl(windowRef, &geometry, "\p",
		false, 0, 0, 
		kControlBehaviorOffsetContents << 16
		| kControlContentPictHandle, 
		kControlBevelButtonLargeBevelProc, (SInt32) 0);
	EmbedControl(largeBevelHandle, userPaneHandle);
	bevelButtonContent.contentType = kControlContentPictHandle;
	smallStickyBevelHandle = NewControl(windowRef, &geometry, "\p",
		false, 0, 0, 
		(kControlBehaviorOffsetContents
			| kControlBehaviorSticky) << 16 
		| kControlContentPictHandle, 
		kControlBevelButtonSmallBevelProc, (SInt32) 0);
	EmbedControl(smallStickyBevelHandle, userPaneHandle);
	medStickyBevelHandle = NewControl(windowRef, &geometry, "\p",
		false, 0, 0, 
		(kControlBehaviorOffsetContents
			| kControlBehaviorSticky) << 16 
		| kControlContentPictHandle, 
		kControlBevelButtonNormalBevelProc, (SInt32) 0);
	EmbedControl(medStickyBevelHandle, userPaneHandle);
	largeStickyBevelHandle = NewControl(windowRef, &geometry, "\p",
		false, 0, 0, 
		(kControlBehaviorOffsetContents
			| kControlBehaviorSticky) << 16 
		| kControlContentPictHandle, 
		kControlBevelButtonLargeBevelProc, (SInt32) 0);
	EmbedControl(largeStickyBevelHandle, userPaneHandle);
    
	picParams.version = -2;
	picParams.hRes = 0x00480000;
	picParams.vRes = 0x00480000;
	picParams.srcRect.top = 0;
	picParams.srcRect.left = 0;
    
	((CWindowPeek) windowRef)->visible = true;
    } else {
	buttonHandle = NewControl(windowRef, &geometry, "\p",
		false, 1, 0, 1, pushButProc, (SInt32) 0);
	checkHandle = NewControl(windowRef, &geometry, "\p",
		false, 1, 0, 1, checkBoxProc, (SInt32) 0);
	radioHandle = NewControl(windowRef, &geometry, "\p",
		false, 1, 0, 1, radioButProc, (SInt32) 0);
	((CWindowPeek) windowRef)->visible = true;

	buttonTabHandle = (CCTabHandle) NewHandle(sizeof(CtlCTab));
	checkTabHandle = (CCTabHandle) NewHandle(sizeof(CtlCTab));
	radioTabHandle = (CCTabHandle) NewHandle(sizeof(CtlCTab));
    }

    /*
     * Remove our window from the window list.	This way our
     * applications and others will not be confused that this
     * window exists - but no one knows about it.
     * I actually don't see the point of doing this, and it causes Floating
     * Window support to crash under Appearance, so I just leave it out.
     * Note that we have to do without this under Carbon, since you can't
     * go poking at the window list...
     */

    if (!TkMacHaveAppearance()) {
        windowList = (CWindowPeek) LMGetWindowList();
        if (windowList == (CWindowPeek) windowRef) {
	    LMSetWindowList((WindowRef) windowList->nextWindow);
        } else {
	    while ((windowList != NULL) 
		    && (windowList->nextWindow != (CWindowPeek) windowRef)) {
	        windowList = windowList->nextWindow;
	    }
	    if (windowList != NULL) {
	        windowList->nextWindow = windowList->nextWindow->nextWindow;
	    }
        }
        ((CWindowPeek) windowRef)->nextWindow = NULL;
    }

    /* 
     * Create an exit handler to clean up this mess if we our
     * unloaded etc.  We need to remember the windows portPixMap
     * so it isn't leaked.
     *
     * TODO: The ButtonExitProc doesn't currently work and the
     * code it includes will crash the Mac on exit from Tk.
	 
     oldPixPtr = ((CWindowPeek) windowRef)->port.portPixMap;
     Tcl_CreateExitHandler(ButtonExitProc, (ClientData) NULL);
    */

}

/*
 *--------------------------------------------------------------
 *
 * SetupBevelButton --
 *
 *	Sets up the Bevel Button with image by copying the
 *	source image onto the PicHandle for the button.
 *
 * Results:
 *	None
 *
 * Side effects:
 *	The image or bitmap for the button is copied over to a picture.
 *
 *--------------------------------------------------------------
 */
void
SetupBevelButton(
    TkButton *butPtr,		/* Tk button. */
    ControlRef controlHandle,	 /* The control to set this picture to */
    GWorldPtr destPort,		/* Off screen GWorld. */
    GC gc,			/* The GC we are drawing into - needed for
				 * the bevel button */
    Pixmap pixmap		/* The pixmap we are drawing into - needed
				   for the bevel button */
    )
{
    int height, width;
    ControlButtonGraphicAlignment theAlignment;
    
    SetPort((GrafPtr) destPort);

    if (butPtr->image != None) {
	Tk_SizeOfImage(butPtr->image, 
		&width, &height);
    } else {
	Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, 
		&width, &height);
    }
	    
    if ((butPtr->width > 0) && (butPtr->width < width)) {
	width = butPtr->width;
    }
    if ((butPtr->height > 0) && (butPtr->height < height)) {
	height = butPtr->height;
    }
    
    picParams.srcRect.right = width;
    picParams.srcRect.bottom = height;
    
    bevelButtonContent.u.picture = OpenCPicture(&picParams);
    
    /*
     * TO DO - There is one case where XCopyPlane calls CopyDeepMask,
     * which does not get recorded in the picture.  So the bitmap code
     * will fail in that case.
     */
     
    if ((butPtr->selectImage != NULL) && (butPtr->flags & SELECTED)) {
	Tk_RedrawImage(butPtr->selectImage, 0, 0, width, height,
		pixmap, 0, 0);
    } else if (butPtr->image != NULL) {
	Tk_RedrawImage(butPtr->image, 0, 0, width, 
		height, pixmap, 0, 0);
    } else {			
	XSetClipOrigin(butPtr->display, gc, 0, 0);
	XCopyPlane(butPtr->display, butPtr->bitmap, pixmap, gc, 0, 0,
		(unsigned int) width, (unsigned int) height, 0, 0, 1);
    }
    
    ClosePicture();
    
    SetControlData(controlHandle, kControlButtonPart,
	    kControlBevelButtonContentTag,
	    sizeof(ControlButtonContentInfo),
	    (char *) &bevelButtonContent);
	    
    if (butPtr->anchor == TK_ANCHOR_N) {
	theAlignment = kControlBevelButtonAlignTop;
    } else if (butPtr->anchor == TK_ANCHOR_NE) { 
	theAlignment = kControlBevelButtonAlignTopRight;
    } else if (butPtr->anchor == TK_ANCHOR_E) { 
	theAlignment = kControlBevelButtonAlignRight;
    } else if (butPtr->anchor == TK_ANCHOR_SE) {
	theAlignment = kControlBevelButtonAlignBottomRight;
    } else if (butPtr->anchor == TK_ANCHOR_S) {
	theAlignment = kControlBevelButtonAlignBottom;
    } else if (butPtr->anchor == TK_ANCHOR_SW) {
	theAlignment = kControlBevelButtonAlignBottomLeft;
    } else if (butPtr->anchor == TK_ANCHOR_W) {
	theAlignment = kControlBevelButtonAlignLeft;
    } else if (butPtr->anchor == TK_ANCHOR_NW) {
	theAlignment = kControlBevelButtonAlignTopLeft;
    } else if (butPtr->anchor == TK_ANCHOR_CENTER) {
	theAlignment = kControlBevelButtonAlignCenter;
    }

    SetControlData(controlHandle, kControlButtonPart,
	    kControlBevelButtonGraphicAlignTag,
	    sizeof(ControlButtonGraphicAlignment),
	    (char *) &theAlignment);

}

/*
 *--------------------------------------------------------------
 *
 * SetUserPaneDrawProc --
 *
 *	Utility function to add a UserPaneDrawProc
 *	to a userPane control.	From MoreControls code
 *	from Apple DTS.
 *
 * Results:
 *	MacOS system error.
 *
 * Side effects:
 *	The user pane gets a new UserPaneDrawProc.
 *
 *--------------------------------------------------------------
 */
pascal OSErr SetUserPaneDrawProc (
    ControlRef control,
    ControlUserPaneDrawProcPtr upp)
{
    ControlUserPaneDrawUPP myControlUserPaneDrawUPP;
    myControlUserPaneDrawUPP = NewControlUserPaneDrawProc(upp);	
    return SetControlData (control, 
	    kControlNoPart, kControlUserPaneDrawProcTag, 
	    sizeof(myControlUserPaneDrawUPP), 
	    (Ptr) &myControlUserPaneDrawUPP);
}

/*
 *--------------------------------------------------------------
 *
 * SetUserPaneSetUpSpecialBackgroundProc --
 *
 *	Utility function to add a UserPaneBackgroundProc
 *	to a userPane control
 *
 * Results:
 *	MacOS system error.
 *
 * Side effects:
 *	The user pane gets a new UserPaneBackgroundProc.
 *
 *--------------------------------------------------------------
 */
pascal OSErr
SetUserPaneSetUpSpecialBackgroundProc(
    ControlRef control, 
    ControlUserPaneBackgroundProcPtr upp)
{
    ControlUserPaneBackgroundUPP myControlUserPaneBackgroundUPP;
    myControlUserPaneBackgroundUPP = NewControlUserPaneBackgroundProc(upp);
    return SetControlData (control, kControlNoPart, 
	    kControlUserPaneBackgroundProcTag, 
	    sizeof(myControlUserPaneBackgroundUPP), 
	    (Ptr) &myControlUserPaneBackgroundUPP);
}

/*
 *--------------------------------------------------------------
 *
 * UserPaneDraw --
 *
 *	This function draws the background of the user pane that will 
 *	lie under checkboxes and radiobuttons.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The user pane gets updated to the current color.
 *
 *--------------------------------------------------------------
 */
pascal void
UserPaneDraw(
    ControlRef control,
    ControlPartCode cpc)
{
    Rect contrlRect = (**control).contrlRect;
    RGBBackColor (&gUserPaneBackground);
    EraseRect (&contrlRect);
}

/*
 *--------------------------------------------------------------
 *
 * UserPaneBackgroundProc --
 *
 *	This function sets up the background of the user pane that will 
 *	lie under checkboxes and radiobuttons.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The user pane background gets set to the current color.
 *
 *--------------------------------------------------------------
 */

pascal void
UserPaneBackgroundProc(
    ControlHandle,
    ControlBackgroundPtr info)
{
    if (info->colorDevice) {
	RGBBackColor (&gUserPaneBackground);
    }
}

/*
 *--------------------------------------------------------------
 *
 * UpdateControlColors --
 *
 *	This function will review the colors used to display
 *	a Macintosh button.  If any non-standard colors are
 *	used we create a custom palette for the button, populate
 *	with the colors for the button and install the palette.
 *
 *	Under Appearance, we just set the pointer that will be
 *	used by the UserPaneDrawProc.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The Macintosh control may get a custom palette installed.
 *
 *--------------------------------------------------------------
 */

static int
UpdateControlColors(
    TkButton *butPtr,
    ControlRef controlHandle,
    CCTabHandle ccTabHandle,
    RGBColor *saveColorPtr)
{
    XColor *xcolor;
    
    /*
     * Under Appearance we cannot change the background of the
     * button itself.  However, the color we are setting is the color
     *	of the containing userPane.  This will be the color that peeks 
     * around the rounded corners of the button.  
     * We make this the highlightbackground rather than the background,
     * because if you color the background of a frame containing a
     * button, you usually also color the highlightbackground as well,
     * or you will get a thin grey ring around the button.
     */
      
    if (TkMacHaveAppearance() && (butPtr->type == TYPE_BUTTON)) {
	xcolor = Tk_3DBorderColor(butPtr->highlightBorder);
    } else {
	xcolor = Tk_3DBorderColor(butPtr->normalBorder);
    }
    if (TkMacHaveAppearance()) {
	TkSetMacColor(xcolor->pixel, &gUserPaneBackground);
    } else {
	(**ccTabHandle).ccSeed = 0;
	(**ccTabHandle).ccRider = 0;
	(**ccTabHandle).ctSize = 3;
	(**ccTabHandle).ctTable[0].value = cBodyColor;
	TkSetMacColor(xcolor->pixel,
		&(**ccTabHandle).ctTable[0].rgb);
	(**ccTabHandle).ctTable[1].value = cTextColor;
	TkSetMacColor(butPtr->normalFg->pixel,
		&(**ccTabHandle).ctTable[1].rgb);
	(**ccTabHandle).ctTable[2].value = cFrameColor;
	TkSetMacColor(butPtr->highlightColorPtr->pixel,
		&(**ccTabHandle).ctTable[2].rgb);
	SetControlColor(controlHandle, ccTabHandle);
	
	if (((xcolor->pixel >> 24) != CONTROL_BODY_PIXEL) && 
		((butPtr->type == TYPE_CHECK_BUTTON) ||
			(butPtr->type == TYPE_RADIO_BUTTON))) {
	    RGBColor newColor;
	
	    if (TkSetMacColor(xcolor->pixel, &newColor)) {
	    ChangeBackgroundWindowColor((**controlHandle).contrlOwner,
		    newColor, saveColorPtr);
            }
	    return true;
	}
    }
    
    return false;
}

/*
 *--------------------------------------------------------------
 *
 * ChangeBackgroundWindowColor --
 *
 *	This procedure will change the background color entry
 *	in the Window's colortable.  The system isn't notified
 *	of the change.	This call should only be used to fool
 *	the drawing routines for checkboxes and radiobuttons.
 *	Any change should be temporary and be reverted after
 *	the widget is drawn.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The Window's color table will be adjusted.
 *
 *--------------------------------------------------------------
 */

static void
ChangeBackgroundWindowColor(
    WindowRef macintoshWindow,	/* A Mac window whose color to change. */
    RGBColor rgbColor,		/* The new RGB Color for the background. */
    RGBColor *oldColor)		/* The old color of the background. */
{
    AuxWinHandle auxWinHandle;
    WCTabHandle winCTabHandle;
    short ctIndex;
    ColorSpecPtr rgbScan;
	
    GetAuxWin(macintoshWindow, &auxWinHandle);
    winCTabHandle = (WCTabHandle) ((**auxWinHandle).awCTable);

    /*
     * Scan through the color table until we find the content
     * (background) color for the window.  Don't tell the system
     * about the change - it will generate damage and we will get
     * into an infinite loop.
     */

    ctIndex = (**winCTabHandle).ctSize;
    while (ctIndex > -1) {
	rgbScan = ctIndex + (**winCTabHandle).ctTable;

	if (rgbScan->value == wContentColor) {
	    *oldColor = rgbScan->rgb;
	    rgbScan->rgb = rgbColor;
	    break;
	}
	ctIndex--;
    }
}

/*
 *--------------------------------------------------------------
 *
 * ButtonEventProc --
 *
 *	This procedure is invoked by the Tk dispatcher for various
 *	events on buttons.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *      When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

static void
ButtonEventProc(
    ClientData clientData,	/* Information about window. */
    XEvent *eventPtr)		/* Information about event. */
{
    TkButton *buttonPtr = (TkButton *) clientData;

    if (eventPtr->type == ActivateNotify
            || eventPtr->type == DeactivateNotify) {
        if ((buttonPtr->tkwin == NULL) || (!Tk_IsMapped(buttonPtr->tkwin))) {
	    return;
        }
        if ((buttonPtr->flags & REDRAW_PENDING) == 0) {
	    Tcl_DoWhenIdle(TkpDisplayButton, (ClientData) buttonPtr);
	    buttonPtr->flags |= REDRAW_PENDING;
        }
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ButtonExitProc --
 *
 *	This procedure is invoked just before the application exits.
 *	It frees all of the control handles, our dummy window, etc.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Memory is freed.
 *
 *----------------------------------------------------------------------
 */

static void
ButtonExitProc(clientData)
    ClientData clientData;		/* Not used. */
{
    Rect pixRect = {0, 0, 10, 10};
    Rect rgnRect = {0, 0, 0, 0};

    /*
     * Restore our dummy window to it's origional state by putting it
     * back in the window list and restoring it's bits.	 The destroy
     * the controls and window.
     */
 
    ((CWindowPeek) windowRef)->nextWindow = (CWindowPeek) LMGetWindowList();
    LMSetWindowList(windowRef);
    ((CWindowPeek) windowRef)->port.portPixMap = oldPixPtr;
    ((CWindowPeek) windowRef)->port.portRect = pixRect;
    RectRgn(((CWindowPeek) windowRef)->port.visRgn, &rgnRect);
    RectRgn(((CWindowPeek) windowRef)->strucRgn, &rgnRect);
    RectRgn(((CWindowPeek) windowRef)->updateRgn, &rgnRect);
    RectRgn(((CWindowPeek) windowRef)->contRgn, &rgnRect);
    PortChanged(windowRef);

    DisposeControl(buttonHandle);
    DisposeControl(checkHandle);
    DisposeControl(radioHandle);
    DisposeWindow(windowRef);
    windowRef = NULL;
}