.so man.macros
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
tk::mac \- Access Mac-Specific Functionality on OS X from Tk
.SH SYNOPSIS
.nf


\fB::tk::mac::ShowPreferences\fR
\fB::tk::mac::OpenApplication\fR
\fB::tk::mac::ReopenApplication\fR
\fB::tk::mac::OpenDocument \fIfile...\fR
\fB::tk::mac::PrintDocument \fIfile...\fR
\fB::tk::mac::Quit\fR
\fB::tk::mac::OnHide\fR
................................................................................

\fB::tk::mac::standardAboutPanel\fR

\fB::tk::mac::useCompatibilityMetrics \fIboolean\fR
\fB::tk::mac::CGAntialiasLimit \fIlimit\fR
\fB::tk::mac::antialiasedtext \fInumber\fR
\fB::tk::mac::useThemedToplevel \fIboolean\fR


\fB::tk::mac::iconBitmap \fIname width height \-kind value\fR
.fi
.BE
.SH "EVENT HANDLER CALLBACKS"
.PP
The Aqua/Mac OS X application environment defines a number of additional
events that applications should respond to. These events are mapped by Tk to
calls to commands in the \fB::tk::mac\fR namespace; unless otherwise noted, if
the command is absent, no action will be taken.
.TP














\fB::tk::mac::ShowPreferences\fR
.
The default Apple Event handler for kAEShowPreferences,
.QW pref .
The application menu
.QW "Preferences"
menu item is only enabled when this proc is defined. Typically this command is

.so man.macros
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
tk::mac \- Access Mac-Specific Functionality on OS X from Tk
.SH SYNOPSIS
.nf
\fB::tk::mac::DoScriptFile\fR
\fB::tk::mac::DoScriptText\fR
\fB::tk::mac::ShowPreferences\fR
\fB::tk::mac::OpenApplication\fR
\fB::tk::mac::ReopenApplication\fR
\fB::tk::mac::OpenDocument \fIfile...\fR
\fB::tk::mac::PrintDocument \fIfile...\fR
\fB::tk::mac::Quit\fR
\fB::tk::mac::OnHide\fR
................................................................................

\fB::tk::mac::standardAboutPanel\fR

\fB::tk::mac::useCompatibilityMetrics \fIboolean\fR
\fB::tk::mac::CGAntialiasLimit \fIlimit\fR
\fB::tk::mac::antialiasedtext \fInumber\fR
\fB::tk::mac::useThemedToplevel \fIboolean\fR


\fB::tk::mac::iconBitmap \fIname width height \-kind value\fR
.fi
.BE
.SH "EVENT HANDLER CALLBACKS"
.PP
The Aqua/Mac OS X application environment defines a number of additional
events that applications should respond to. These events are mapped by Tk to
calls to commands in the \fB::tk::mac\fR namespace; unless otherwise noted, if
the command is absent, no action will be taken.
.TP
\fB::tk::mac::DoScriptFile\fR
.
The default Apple Event handler for AEDoScriptHandler. This command,
if defined, executes a Tcl file when an AppleScript sends a
.QW "do script"
command to Wish with a file path as a parameter. 
.TP
\fB::tk::mac::DoScriptText\fR
.
The default Apple Event handler for AEDoScriptHandler. This command,
if defined, executes Tcl code when an AppleScript sends a
.QW "do script"
command to Wish with Tcl code or a Tcl procedure as a parameter.
.TP
\fB::tk::mac::ShowPreferences\fR
.
The default Apple Event handler for kAEShowPreferences,
.QW pref .
The application menu
.QW "Preferences"
menu item is only enabled when this proc is defined. Typically this command is

bind Menubutton <FocusIn> {}
bind Menubutton <Enter> {
    tk::MbEnter %W
}
bind Menubutton <Leave> {
    tk::MbLeave %W





}
bind Menubutton <1> {
    if {$tk::Priv(inMenubutton) ne ""} {
	tk::MbPost $tk::Priv(inMenubutton) %X %Y
    }
}
bind Menubutton <Motion> {
................................................................................
    if {$::tk_strictMotif} {
        set Priv(cursor) [$w cget -cursor]
        $w configure -cursor arrow
    }
    if {[tk windowingsystem] ne "aqua"} {
	set Priv(relief) [$w cget -relief]
	$w configure -relief raised



    } else {
	$w configure -state active
    }

    set Priv(postedMb) $w
    set Priv(focus) [focus]
    $menu activate none

bind Menubutton <FocusIn> {}
bind Menubutton <Enter> {
    tk::MbEnter %W
}
bind Menubutton <Leave> {
    tk::MbLeave %W
}
if {$::tk::android} {
    bind Menubutton <<FingerUp>> {
	if {%s == 1} {tk::MbLeave %W}
    }
}
bind Menubutton <1> {
    if {$tk::Priv(inMenubutton) ne ""} {
	tk::MbPost $tk::Priv(inMenubutton) %X %Y
    }
}
bind Menubutton <Motion> {
................................................................................
    if {$::tk_strictMotif} {
        set Priv(cursor) [$w cget -cursor]
        $w configure -cursor arrow
    }
    if {[tk windowingsystem] ne "aqua"} {
	set Priv(relief) [$w cget -relief]
	$w configure -relief raised
	if {[$w cget -state] ne "active"} {
	    $w configure -state active
	}
    } else {
	$w configure -state active
    }

    set Priv(postedMb) $w
    set Priv(focus) [focus]
    $menu activate none

bind TMenubutton <Enter>	{ %W instate !disabled {%W state active } }
bind TMenubutton <Leave>	{ %W state !active }
bind TMenubutton <Key-space> 	{ ttk::menubutton::Popdown %W }
bind TMenubutton <<Invoke>> 	{ ttk::menubutton::Popdown %W }

if {[tk windowingsystem] eq "x11"} {





    bind TMenubutton <ButtonPress-1>  	{ ttk::menubutton::Pulldown %W }
    bind TMenubutton <ButtonRelease-1>	{ ttk::menubutton::TransferGrab %W }
    bind TMenubutton <B1-Leave> 	{ ttk::menubutton::TransferGrab %W }
} else {
    bind TMenubutton <ButtonPress-1>  \
	{ %W state pressed ; ttk::menubutton::Popdown %W }
    bind TMenubutton <ButtonRelease-1>  \
................................................................................
proc ttk::menubutton::Pulldown {mb} {
    variable State
    if {[$mb instate disabled] || [set menu [$mb cget -menu]] eq ""} {
	return
    }
    set State(pulldown) 1
    set State(oldcursor) [$mb cget -cursor]


    $mb state pressed
    $mb configure -cursor [$menu cget -cursor]
    foreach {x y entry} [PostPosition $mb $menu] { break }
    if {$entry ne {}} {
	$menu post $x $y $entry
    } else {

bind TMenubutton <Enter>	{ %W instate !disabled {%W state active } }
bind TMenubutton <Leave>	{ %W state !active }
bind TMenubutton <Key-space> 	{ ttk::menubutton::Popdown %W }
bind TMenubutton <<Invoke>> 	{ ttk::menubutton::Popdown %W }

if {[tk windowingsystem] eq "x11"} {
    if {$::tk::android} {
	bind TMenubutton <<FingerUp>> {
	    if {%s == 1} { %W instate active { %W state !active } }
	}
    }
    bind TMenubutton <ButtonPress-1>  	{ ttk::menubutton::Pulldown %W }
    bind TMenubutton <ButtonRelease-1>	{ ttk::menubutton::TransferGrab %W }
    bind TMenubutton <B1-Leave> 	{ ttk::menubutton::TransferGrab %W }
} else {
    bind TMenubutton <ButtonPress-1>  \
	{ %W state pressed ; ttk::menubutton::Popdown %W }
    bind TMenubutton <ButtonRelease-1>  \
................................................................................
proc ttk::menubutton::Pulldown {mb} {
    variable State
    if {[$mb instate disabled] || [set menu [$mb cget -menu]] eq ""} {
	return
    }
    set State(pulldown) 1
    set State(oldcursor) [$mb cget -cursor]
    $mb instate !active { $mb state active }

    $mb state pressed
    $mb configure -cursor [$menu cget -cursor]
    foreach {x y entry} [PostPosition $mb $menu] { break }
    if {$entry ne {}} {
	$menu post $x $y $entry
    } else {

}
@end
 

@implementation TKContentView

-(id)init {
    if (self = [super init]) {

        _needsRedisplay = NO;
    }
    return self;
}

/* <NSTextInput> implementation (called through interpretKeyEvents:]). */

}
@end
 

@implementation TKContentView

-(id)init {
    self = [super init];
    if (self) {
        _needsRedisplay = NO;
    }
    return self;
}

/* <NSTextInput> implementation (called through interpretKeyEvents:]). */

 */

@implementation TKApplication(TKMouseEvent)
- (NSEvent *) tkProcessMouseEvent: (NSEvent *) theEvent
{
    NSWindow *eventWindow = [theEvent window];
    NSEventType eventType = [theEvent type];
    TkWindow *winPtr, *grabWinPtr;
    Tk_Window tkwin;
    NSPoint local, global;
#if 0
    NSTrackingArea *trackingArea = nil;
    NSInteger eventNumber, clickCount, buttonNumber;
#endif

 */

@implementation TKApplication(TKMouseEvent)
- (NSEvent *) tkProcessMouseEvent: (NSEvent *) theEvent
{
    NSWindow *eventWindow = [theEvent window];
    NSEventType eventType = [theEvent type];
    TkWindow *winPtr = NULL, *grabWinPtr;
    Tk_Window tkwin;
    NSPoint local, global;
#if 0
    NSTrackingArea *trackingArea = nil;
    NSInteger eventNumber, clickCount, buttonNumber;
#endif

@end

VISIBILITY_HIDDEN
@interface TKContentView : NSView <NSTextInput>
{
@private
    NSString *privateWorkingText;
#ifdef __i386__
    /* The Objective C runtime used on i386 requires this. */
    Bool _needsRedisplay;
#endif
}
@property Bool needsRedisplay;
@end

@interface TKContentView(TKKeyEvent)
- (void) deleteWorkingText;
@end

@end

VISIBILITY_HIDDEN
@interface TKContentView : NSView <NSTextInput>
{
@private
    NSString *privateWorkingText;


    Bool _needsRedisplay;

}
@property Bool needsRedisplay;
@end

@interface TKContentView(TKKeyEvent)
- (void) deleteWorkingText;
@end

 *	This file implements the Macintosh specific portion of the scrollbar
 *	widget.
 *
 * Copyright (c) 1996 by Sun Microsystems, Inc.
 * Copyright 2001-2009, Apple Inc.
 * Copyright (c) 2006-2009 Daniel A. Steffen <das@users.sourceforge.net>
 * Copyright (c) 2015 Kevin Walzer/WordTech Commununications LLC.
 * Copyright (c) 2018 Marc Culler
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tkInt.h"
#include "tkScrollbar.h"
#include "tkMacOSXPrivate.h"

#define MIN_SCROLLBAR_VALUE		0

/*
 * Minimum slider length, in pixels (designed to make sure that the slider is
 * always easy to grab with the mouse).
 */

#define MIN_SLIDER_LENGTH	5


/*
 * Borrowed from ttkMacOSXTheme.c to provide appropriate scaling.
 */

#ifdef __LP64__
#define RangeToFactor(maximum)	(((double) (INT_MAX >> 1)) / (maximum))
................................................................................
typedef struct ScrollbarMetrics {
    SInt32 width, minThumbHeight;
    int minHeight, topArrowHeight, bottomArrowHeight;
    NSControlSize controlSize;
} ScrollbarMetrics;

static ScrollbarMetrics metrics = {
    15, 54, 26, 14, 14, kControlSizeNormal /* kThemeScrollBarMedium */

};

/*
 * Declarations of static functions defined later in this file:
 */

static void		ScrollbarEventProc(ClientData clientData,
................................................................................
 *
 * Side effects:
 *	Draws a scrollbar on the screen.
 *
 *--------------------------------------------------------------
 */











































































void
TkpDisplayScrollbar(
    ClientData clientData)	/* Information about window. */
{
    TkScrollbar *scrollPtr = clientData;
    MacScrollbar *msPtr = (MacScrollbar *) scrollPtr;
    Tk_Window tkwin = scrollPtr->tkwin;
................................................................................

    if ((view == NULL)
	    || (macWin->flags & TK_DO_NOT_DRAW)
	    || !TkMacOSXSetupDrawingContext((Drawable) macWin, NULL, 1, &dc)) {
	return;
    }





    CGFloat viewHeight = [view bounds].size.height;
    CGAffineTransform t = {
	.a = 1, .b = 0,
	.c = 0, .d = -1,
	.tx = 0, .ty = viewHeight
    };

................................................................................
     * Update values and then draw the native scrollbar over the rectangle.
     */

    UpdateControlValues(scrollPtr);

    if (SNOW_LEOPARD_STYLE) {
	HIThemeDrawTrack(&msPtr->info, 0, dc.context,
		kHIThemeOrientationInverted);
    } else {
	HIThemeDrawTrack(&msPtr->info, 0, dc.context,
		kHIThemeOrientationNormal);


    }
    TkMacOSXRestoreDrawingContext(&dc);









    scrollPtr->flags &= ~REDRAW_PENDING;
}
 
/*
 *----------------------------------------------------------------------
 *
 * TkpComputeScrollbarGeometry --
................................................................................
    if (fieldLength < 0) {
	fieldLength = 0;
    }
    scrollPtr->sliderFirst = fieldLength*scrollPtr->firstFraction;
    scrollPtr->sliderLast = fieldLength*scrollPtr->lastFraction;

    /*
     * Adjust the slider so that some piece of it is always displayed in the
     * scrollbar and so that it has at least a minimal width (so it can be
     * grabbed with the mouse).

     */









    if (scrollPtr->sliderFirst > fieldLength - MIN_SLIDER_LENGTH) {
	scrollPtr->sliderFirst = fieldLength - MIN_SLIDER_LENGTH;
    }
    if (scrollPtr->sliderFirst < 0) {
	scrollPtr->sliderFirst = 0;
    }
    if (scrollPtr->sliderLast < scrollPtr->sliderFirst + MIN_SLIDER_LENGTH) {
	scrollPtr->sliderLast = scrollPtr->sliderFirst + MIN_SLIDER_LENGTH;
    }
    if (scrollPtr->sliderLast > fieldLength) {
	scrollPtr->sliderLast = fieldLength;
    }
    scrollPtr->sliderFirst += -scrollPtr->arrowLength + scrollPtr->inset;
    scrollPtr->sliderLast += scrollPtr->inset;

    /*
     * Register the desired geometry for the window. Leave enough space for the
     * two arrows, if there are any arrows, plus a minimum-size slider, plus
     * border around the whole window, if any. Then arrange for the window to
................................................................................
    frame = NSInsetRect(frame, scrollPtr->inset, scrollPtr->inset);
    frame.origin.y = viewHeight - (frame.origin.y + frame.size.height);

    contrlRect = NSRectToCGRect(frame);
    msPtr->info.bounds = contrlRect;

    width = contrlRect.size.width;
    height = contrlRect.size.height;

    /*
     * Ensure we set scrollbar control bounds only once all size adjustments
     * have been computed.
     */

    msPtr->info.bounds = contrlRect;
................................................................................
     * Macintosh thumb. The Aqua scroll control works as follows. The
     * scrollbar's value is the position of the left (or top) side of the view
     * area in the content area being scrolled. The maximum value of the
     * control is therefore the dimension of the content area less the size of
     * the view area.
     */

    double maximum = 100, factor = RangeToFactor(maximum);

    dViewSize = (scrollPtr->lastFraction - scrollPtr->firstFraction) * factor;
    msPtr->info.max = MIN_SCROLLBAR_VALUE + factor - dViewSize;
    msPtr->info.trackInfo.scrollbar.viewsize = dViewSize;
    if (scrollPtr->vertical) {
	if (SNOW_LEOPARD_STYLE) {
	    msPtr->info.value = factor * scrollPtr->firstFraction;
	} else {
	    msPtr->info.value = msPtr->info.max -
		    factor * scrollPtr->firstFraction;
	}
    } else {
	msPtr->info.value = MIN_SCROLLBAR_VALUE +
		factor * scrollPtr->firstFraction;
    }

    if ((scrollPtr->firstFraction <= 0.0 && scrollPtr->lastFraction >= 1.0)
	    || height <= metrics.minHeight) {
    	msPtr->info.enableState = kThemeTrackHideTrack;
    } else {
        msPtr->info.enableState = kThemeTrackActive;
................................................................................
	    msPtr->info.trackInfo.scrollbar.pressState = kThemeThumbPressed;
	    break;
	case BOTTOM_GAP:
	    msPtr->info.trackInfo.scrollbar.pressState =
		    kThemeBottomTrackPressed;
	    break;
	case TOP_ARROW:

	    /*
	     * This looks wrong and the docs say it is wrong but it works.
	     */

	    msPtr->info.trackInfo.scrollbar.pressState =
		    kThemeTopInsideArrowPressed;
	    break;
................................................................................
    }
    if (eventPtr->type == LeaveNotify) {
	msPtr->mouseOver = false;
	if (!msPtr->buttonDown) {
	    msPtr->info.trackInfo.scrollbar.pressState = 0;
	}
    }

    return TCL_OK;
}
 
/*
 *--------------------------------------------------------------
 *
 * ScrollbarEventProc --

 *	This file implements the Macintosh specific portion of the scrollbar
 *	widget.
 *
 * Copyright (c) 1996 by Sun Microsystems, Inc.
 * Copyright 2001-2009, Apple Inc.
 * Copyright (c) 2006-2009 Daniel A. Steffen <das@users.sourceforge.net>
 * Copyright (c) 2015 Kevin Walzer/WordTech Commununications LLC.
 * Copyright (c) 2018-2019 Marc Culler
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tkInt.h"
#include "tkScrollbar.h"
#include "tkMacOSXPrivate.h"



/*
 * Minimum slider length, in pixels (designed to make sure that the slider is
 * always easy to grab with the mouse).
 */

#define MIN_SLIDER_LENGTH	18
#define MIN_GAP			4

/*
 * Borrowed from ttkMacOSXTheme.c to provide appropriate scaling.
 */

#ifdef __LP64__
#define RangeToFactor(maximum)	(((double) (INT_MAX >> 1)) / (maximum))
................................................................................
typedef struct ScrollbarMetrics {
    SInt32 width, minThumbHeight;
    int minHeight, topArrowHeight, bottomArrowHeight;
    NSControlSize controlSize;
} ScrollbarMetrics;

static ScrollbarMetrics metrics = {
    /* kThemeScrollBarMedium */
    15, MIN_SLIDER_LENGTH, 26, 14, 14, kControlSizeNormal
};

/*
 * Declarations of static functions defined later in this file:
 */

static void		ScrollbarEventProc(ClientData clientData,
................................................................................
 *
 * Side effects:
 *	Draws a scrollbar on the screen.
 *
 *--------------------------------------------------------------
 */

#if MAC_OS_X_VERSION_MAX_ALLOWED > 1080

/*
 * This stand-alone drawing function is used on macOS 10.9 and newer because
 * the HIToolbox does not draw the scrollbar thumb at the expected size on
 * those systems.  The thumb is drawn too large, causing a mouse click on the
 * thumb to be interpreted as a mouse click in the trough.
 */

static void drawMacScrollbar(
    TkScrollbar *scrollPtr,
    MacScrollbar *msPtr,
    CGContextRef context)
{
    MacDrawable *macWin = (MacDrawable *) Tk_WindowId(scrollPtr->tkwin);
    NSView *view = TkMacOSXDrawableView(macWin);
    CGPathRef path;
    CGPoint inner[2], outer[2], thumbOrigin;
    CGSize thumbSize;
    CGRect troughBounds = msPtr->info.bounds;
    troughBounds.origin.y = [view bounds].size.height -
	(troughBounds.origin.y + troughBounds.size.height);
    if (scrollPtr->vertical) {
	thumbOrigin.x = troughBounds.origin.x + MIN_GAP;
	thumbOrigin.y = troughBounds.origin.y + scrollPtr->sliderFirst;
	thumbSize.width = troughBounds.size.width - 2*MIN_GAP + 1;
	thumbSize.height = scrollPtr->sliderLast - scrollPtr->sliderFirst;
	inner[0] = troughBounds.origin;
	inner[1] = CGPointMake(inner[0].x,
			       inner[0].y + troughBounds.size.height);
	outer[0] = CGPointMake(inner[0].x + troughBounds.size.width - 1,
			       inner[0].y);
	outer[1] = CGPointMake(outer[0].x, inner[1].y);
    } else {
	thumbOrigin.x = troughBounds.origin.x + scrollPtr->sliderFirst;
	thumbOrigin.y = troughBounds.origin.y + MIN_GAP;
	thumbSize.width = scrollPtr->sliderLast - scrollPtr->sliderFirst;
	thumbSize.height = troughBounds.size.height - 2*MIN_GAP + 1;
	inner[0] = troughBounds.origin;
	inner[1] = CGPointMake(inner[0].x + troughBounds.size.width,
			       inner[0].y + 1);
	outer[0] = CGPointMake(inner[0].x,
			       inner[0].y + troughBounds.size.height);
	outer[1] = CGPointMake(inner[1].x, outer[0].y);
    }
    CGContextSetShouldAntialias(context, false);
    CGContextSetGrayFillColor(context, 250.0 / 255, 1.0);
    CGContextFillRect(context, troughBounds);
    CGContextSetGrayStrokeColor(context, 232.0 / 255, 1.0);
    CGContextStrokeLineSegments(context, inner, 2);
    CGContextSetGrayStrokeColor(context, 238.0 / 255, 1.0);
    CGContextStrokeLineSegments(context, outer, 2);

    /*
     * Do not display the thumb unless scrolling is possible.
     */
    
    if (scrollPtr->firstFraction > 0.0 || scrollPtr->lastFraction < 1.0) {
	CGRect thumbBounds = {thumbOrigin, thumbSize};
	path = CGPathCreateWithRoundedRect(thumbBounds, 4, 4, NULL);
	CGContextBeginPath(context);
	CGContextAddPath(context, path);
	if (msPtr->info.trackInfo.scrollbar.pressState != 0) {
	    CGContextSetGrayFillColor(context, 133.0 / 255, 1.0);
	} else {
	    CGContextSetGrayFillColor(context, 200.0 / 255, 1.0);
	}
	CGContextSetShouldAntialias(context, true);
	CGContextFillPath(context);
	CFRelease(path);
    }
}
#endif
	       
void
TkpDisplayScrollbar(
    ClientData clientData)	/* Information about window. */
{
    TkScrollbar *scrollPtr = clientData;
    MacScrollbar *msPtr = (MacScrollbar *) scrollPtr;
    Tk_Window tkwin = scrollPtr->tkwin;
................................................................................

    if ((view == NULL)
	    || (macWin->flags & TK_DO_NOT_DRAW)
	    || !TkMacOSXSetupDrawingContext((Drawable) macWin, NULL, 1, &dc)) {
	return;
    }

    /*
     * Transform NSView coordinates to CoreGraphics coordinates.
     */

    CGFloat viewHeight = [view bounds].size.height;
    CGAffineTransform t = {
	.a = 1, .b = 0,
	.c = 0, .d = -1,
	.tx = 0, .ty = viewHeight
    };

................................................................................
     * Update values and then draw the native scrollbar over the rectangle.
     */

    UpdateControlValues(scrollPtr);

    if (SNOW_LEOPARD_STYLE) {
	HIThemeDrawTrack(&msPtr->info, 0, dc.context,
			 kHIThemeOrientationInverted);
    } else if ([NSApp macMinorVersion] <= 8) {
	HIThemeDrawTrack(&msPtr->info, 0, dc.context,
			 kHIThemeOrientationNormal);
    } else {
#if MAC_OS_X_VERSION_MAX_ALLOWED > 1080


	/*
	 * Switch back to NSView coordinates and draw a modern scrollbar.
	 */
	
	CGContextConcatCTM(dc.context, t);
	drawMacScrollbar(scrollPtr, msPtr, dc.context);
#endif
    }
    TkMacOSXRestoreDrawingContext(&dc);
    scrollPtr->flags &= ~REDRAW_PENDING;
}
 
/*
 *----------------------------------------------------------------------
 *
 * TkpComputeScrollbarGeometry --
................................................................................
    if (fieldLength < 0) {
	fieldLength = 0;
    }
    scrollPtr->sliderFirst = fieldLength*scrollPtr->firstFraction;
    scrollPtr->sliderLast = fieldLength*scrollPtr->lastFraction;

    /*

     * Adjust the slider so that it has at least a minimal size and so there

     * is a small gap on either end which can be used to scroll by one page.
     */

    if (scrollPtr->sliderFirst < MIN_GAP) {
	scrollPtr->sliderFirst = MIN_GAP;
	scrollPtr->sliderLast += MIN_GAP;
    }
    if (scrollPtr->sliderLast > fieldLength - MIN_GAP) {
	scrollPtr->sliderLast = fieldLength - MIN_GAP;
	scrollPtr->sliderFirst -= MIN_GAP;
    }
    if (scrollPtr->sliderFirst > fieldLength - MIN_SLIDER_LENGTH) {
	scrollPtr->sliderFirst = fieldLength - MIN_SLIDER_LENGTH;
    }



    if (scrollPtr->sliderLast < scrollPtr->sliderFirst + MIN_SLIDER_LENGTH) {
	scrollPtr->sliderLast = scrollPtr->sliderFirst + MIN_SLIDER_LENGTH;
    }



    scrollPtr->sliderFirst += -scrollPtr->arrowLength + scrollPtr->inset;
    scrollPtr->sliderLast += scrollPtr->inset;

    /*
     * Register the desired geometry for the window. Leave enough space for the
     * two arrows, if there are any arrows, plus a minimum-size slider, plus
     * border around the whole window, if any. Then arrange for the window to
................................................................................
    frame = NSInsetRect(frame, scrollPtr->inset, scrollPtr->inset);
    frame.origin.y = viewHeight - (frame.origin.y + frame.size.height);

    contrlRect = NSRectToCGRect(frame);
    msPtr->info.bounds = contrlRect;

    width = contrlRect.size.width;
    height = contrlRect.size.height - scrollPtr->arrowLength;

    /*
     * Ensure we set scrollbar control bounds only once all size adjustments
     * have been computed.
     */

    msPtr->info.bounds = contrlRect;
................................................................................
     * Macintosh thumb. The Aqua scroll control works as follows. The
     * scrollbar's value is the position of the left (or top) side of the view
     * area in the content area being scrolled. The maximum value of the
     * control is therefore the dimension of the content area less the size of
     * the view area.
     */

    double factor = RangeToFactor(100.0);

    dViewSize = (scrollPtr->lastFraction - scrollPtr->firstFraction) * factor;
    msPtr->info.max = factor - dViewSize;
    msPtr->info.trackInfo.scrollbar.viewsize = dViewSize;
    if (scrollPtr->vertical) {
	if (SNOW_LEOPARD_STYLE) {
	    msPtr->info.value = factor * scrollPtr->firstFraction;
	} else {
	    msPtr->info.value = msPtr->info.max -
		    factor * scrollPtr->firstFraction;
	}
    } else {

	msPtr->info.value = factor * scrollPtr->firstFraction;
    }

    if ((scrollPtr->firstFraction <= 0.0 && scrollPtr->lastFraction >= 1.0)
	    || height <= metrics.minHeight) {
    	msPtr->info.enableState = kThemeTrackHideTrack;
    } else {
        msPtr->info.enableState = kThemeTrackActive;
................................................................................
	    msPtr->info.trackInfo.scrollbar.pressState = kThemeThumbPressed;
	    break;
	case BOTTOM_GAP:
	    msPtr->info.trackInfo.scrollbar.pressState =
		    kThemeBottomTrackPressed;
	    break;
	case TOP_ARROW:

	    /*
	     * This looks wrong and the docs say it is wrong but it works.
	     */

	    msPtr->info.trackInfo.scrollbar.pressState =
		    kThemeTopInsideArrowPressed;
	    break;
................................................................................
    }
    if (eventPtr->type == LeaveNotify) {
	msPtr->mouseOver = false;
	if (!msPtr->buttonDown) {
	    msPtr->info.trackInfo.scrollbar.pressState = 0;
	}
    }
    TkScrollbarEventuallyRedraw(scrollPtr);
    return TCL_OK;
}
 
/*
 *--------------------------------------------------------------
 *
 * ScrollbarEventProc --

 * that must be defined in info.plist.
 */

- (void)provideService:(NSPasteboard *)pboard
	      userData:(NSString *)data
		 error:(NSString **)error
{
    NSString *pboardString, *pboardType;
    NSArray *types = [pboard types];
    Tcl_Event *event;

    /*
     * Get string from private pasteboard, write to general pasteboard to make
     * available to Tcl service.
     */

 * that must be defined in info.plist.
 */

- (void)provideService:(NSPasteboard *)pboard
	      userData:(NSString *)data
		 error:(NSString **)error
{
    NSString *pboardString = nil, *pboardType = nil;
    NSArray *types = [pboard types];
    Tcl_Event *event;

    /*
     * Get string from private pasteboard, write to general pasteboard to make
     * available to Tcl service.
     */

						count:4];
    CGFloat x = bounds.origin.x, y = bounds.origin.y;
    CGFloat w = bounds.size.width, h = bounds.size.height;
    CGPoint topPart[4] = {
	{x, y + h}, {x, y + 1}, {x + w - 1, y + 1}, {x + w - 1, y + h}
    };
    CGPoint bottom[2] = {{x, y + h}, {x + w, y + h}};
    CGRect outerRect = CGRectInset(bounds, -3, -3);

    CGContextSaveGState(context);
    CGContextSetShouldAntialias(context, false);
    CGContextBeginPath(context);
    strokeColor = [NSColor colorWithColorSpace: deviceRGB
				    components: darkFocusRingTop
					 count: 4];
................................................................................
				    components: darkFocusRingBottom
					 count: 4];
    CGContextSetStrokeColorWithColor(context, CGCOLOR(strokeColor));
    CGContextAddLines(context, bottom, 2);
    CGContextStrokePath(context);
    CGContextSetShouldAntialias(context, true);
    CGContextSetFillColorWithColor(context, CGCOLOR(fillColor));
    CGPathRef path = CGPathCreateWithRoundedRect(outerRect, 4, 4, NULL);

    CGContextBeginPath(context);
    CGContextAddPath(context, path);
    CGContextAddRect(context, bounds);
    CGContextEOFillPath(context);
    CGContextRestoreGState(context);
}
/*----------------------------------------------------------------------
................................................................................
    CGFloat x = bounds.origin.x, y = bounds.origin.y;
    CGFloat w = bounds.size.width, h = bounds.size.height;
    CGPoint topPart[4] = {
	{x, y + h - 1}, {x, y + 1}, {x + w, y + 1}, {x + w, y + h - 1}
    };
    CGPoint bottom[2] = {{x, y + h}, {x + w, y + h}};
    CGPoint accent[2] = {{x, y + 1}, {x + w, y + 1}};

    switch (kind) {
    case kHIThemeFrameTextFieldSquare:
	CGContextSaveGState(context);
	CGContextSetShouldAntialias(context, false);
	CGContextBeginPath(context);
	stroke = [NSColor colorWithColorSpace: deviceRGB
	    components: darkFrameTop
................................................................................
    int *minHeight,
    Ttk_Padding *paddingPtr)
{
    ScrollbarElement *scrollbar = elementRecord;
    int orientation = TTK_ORIENT_HORIZONTAL;

    Ttk_GetOrientFromObj(NULL, scrollbar->orientObj, &orientation);


    *minHeight = *minWidth = 8;




}

static void ThumbElementDraw(
    void *clientData,
    void *elementRecord,
    Tk_Window tkwin,
    Drawable d,
................................................................................
    Ttk_GetOrientFromObj(NULL, scrollbar->orientObj, &orientation);

    /*
     * In order to make ttk scrollbars work correctly it is necessary to be
     * able to display the thumb element at the size and location which the ttk
     * scrollbar widget requests.  The algorithm that HIToolbox uses to
     * determine the thumb geometry from the input values of min, max, value
     * and viewSize is, of course, undocumented.  And this turns out to be a
     * hard reverse engineering problem.  A seemingly natural algorithm is
     * implemented below, but it does not correctly compute the same thumb
     * geometry as HITools (which also apparently does not agree with
     * NSScrollbar).  This code uses that algorithm for older OS versions,
     * because using HITools also handles drawing the buttons and 3D thumb used
     * on those systems.  The incorrect geometry is annoying but not completely
     * unusable.  For newer systems the cleanest approach is to just draw the
     * thumb directly.
     */

    if ([NSApp macMinorVersion] > 8) {
	CGRect thumbBounds = BoxToRect(d, b);
	NSColorSpace *deviceRGB = [NSColorSpace deviceRGBColorSpace];
	NSColor *thumbColor;
	CGFloat *rgba;
................................................................................
	thumbColor = [NSColor colorWithColorSpace: deviceRGB
	    components: rgba
	    count: 4];
	BEGIN_DRAWING(d)
	SolidFillRoundedRectangle(dc.context, thumbBounds, 4, thumbColor);
	END_DRAWING
    } else {
	double thumbSize, trackSize, visibleSize, viewSize;
	MacDrawable *macWin = (MacDrawable *) Tk_WindowId(tkwin);
	CGRect troughBounds = {{macWin->xOff, macWin->yOff},
			       {Tk_Width(tkwin), Tk_Height(tkwin)}};

        /*
         * The info struct has integer fields, which will be converted to
         * floats in the drawing routine.  All of values provided in the info
         * struct, namely min, max, value, and viewSize are only defined up to
         * an arbitrary scale factor.  To avoid roundoff error we scale so
         * that the viewSize is a large float which is smaller than the
         * largest int.
         */

	viewSize = RangeToFactor(100.0);
	HIThemeTrackDrawInfo info = {
	    .version = 0,
	    .bounds = troughBounds,
	    .min = 0,
	    .attributes = kThemeTrackShowThumb |
		kThemeTrackThumbRgnIsNotGhost,
	    .enableState = kThemeTrackActive
	};
	info.trackInfo.scrollbar.viewsize = viewSize * .8;
	if (orientation == TTK_ORIENT_HORIZONTAL) {
	    trackSize = troughBounds.size.width;
	    thumbSize = b.width;
	    visibleSize = (thumbSize / trackSize) * viewSize;
	    info.max = viewSize - visibleSize;
	    info.value = info.max * (b.x / (trackSize - thumbSize));
	} else {
	    thumbSize = b.height;
	    trackSize = troughBounds.size.height;



	    visibleSize = (thumbSize / trackSize) * viewSize;
	    info.max = viewSize - visibleSize;





	    info.value = info.max * (b.y / (trackSize - thumbSize));
	}
	if ((state & TTK_STATE_PRESSED) ||
	    (state & TTK_STATE_HOVER)) {
	    info.trackInfo.scrollbar.pressState = kThemeThumbPressed;
	} else {
	    info.trackInfo.scrollbar.pressState = 0;
	}

						count:4];
    CGFloat x = bounds.origin.x, y = bounds.origin.y;
    CGFloat w = bounds.size.width, h = bounds.size.height;
    CGPoint topPart[4] = {
	{x, y + h}, {x, y + 1}, {x + w - 1, y + 1}, {x + w - 1, y + h}
    };
    CGPoint bottom[2] = {{x, y + h}, {x + w, y + h}};


    CGContextSaveGState(context);
    CGContextSetShouldAntialias(context, false);
    CGContextBeginPath(context);
    strokeColor = [NSColor colorWithColorSpace: deviceRGB
				    components: darkFocusRingTop
					 count: 4];
................................................................................
				    components: darkFocusRingBottom
					 count: 4];
    CGContextSetStrokeColorWithColor(context, CGCOLOR(strokeColor));
    CGContextAddLines(context, bottom, 2);
    CGContextStrokePath(context);
    CGContextSetShouldAntialias(context, true);
    CGContextSetFillColorWithColor(context, CGCOLOR(fillColor));
    CGPathRef path = CGPathCreateWithRoundedRect(CGRectInset(bounds, -3, -3),
						 4, 4, NULL);
    CGContextBeginPath(context);
    CGContextAddPath(context, path);
    CGContextAddRect(context, bounds);
    CGContextEOFillPath(context);
    CGContextRestoreGState(context);
}
/*----------------------------------------------------------------------
................................................................................
    CGFloat x = bounds.origin.x, y = bounds.origin.y;
    CGFloat w = bounds.size.width, h = bounds.size.height;
    CGPoint topPart[4] = {
	{x, y + h - 1}, {x, y + 1}, {x + w, y + 1}, {x + w, y + h - 1}
    };
    CGPoint bottom[2] = {{x, y + h}, {x + w, y + h}};
    CGPoint accent[2] = {{x, y + 1}, {x + w, y + 1}};

    switch (kind) {
    case kHIThemeFrameTextFieldSquare:
	CGContextSaveGState(context);
	CGContextSetShouldAntialias(context, false);
	CGContextBeginPath(context);
	stroke = [NSColor colorWithColorSpace: deviceRGB
	    components: darkFrameTop
................................................................................
    int *minHeight,
    Ttk_Padding *paddingPtr)
{
    ScrollbarElement *scrollbar = elementRecord;
    int orientation = TTK_ORIENT_HORIZONTAL;

    Ttk_GetOrientFromObj(NULL, scrollbar->orientObj, &orientation);
    if (orientation == TTK_ORIENT_VERTICAL) {
	*minHeight = 18;
	*minWidth = 8;
    } else {
	*minHeight = 8;
	*minWidth = 18;
    }	
}

static void ThumbElementDraw(
    void *clientData,
    void *elementRecord,
    Tk_Window tkwin,
    Drawable d,
................................................................................
    Ttk_GetOrientFromObj(NULL, scrollbar->orientObj, &orientation);

    /*
     * In order to make ttk scrollbars work correctly it is necessary to be
     * able to display the thumb element at the size and location which the ttk
     * scrollbar widget requests.  The algorithm that HIToolbox uses to
     * determine the thumb geometry from the input values of min, max, value

     * and viewSize is undocumented.  A seemingly natural algorithm is


     * implemented below.  This code uses that algorithm for older OS versions,
     * because using HITools also handles drawing the buttons and 3D thumb used

     * on those systems.  For newer systems the cleanest approach is to just
     * draw the thumb directly.
     */

    if ([NSApp macMinorVersion] > 8) {
	CGRect thumbBounds = BoxToRect(d, b);
	NSColorSpace *deviceRGB = [NSColorSpace deviceRGBColorSpace];
	NSColor *thumbColor;
	CGFloat *rgba;
................................................................................
	thumbColor = [NSColor colorWithColorSpace: deviceRGB
	    components: rgba
	    count: 4];
	BEGIN_DRAWING(d)
	SolidFillRoundedRectangle(dc.context, thumbBounds, 4, thumbColor);
	END_DRAWING
    } else {
	double thumbSize, trackSize, visibleSize, factor, fraction;
	MacDrawable *macWin = (MacDrawable *) Tk_WindowId(tkwin);
	CGRect troughBounds = {{macWin->xOff, macWin->yOff},
			       {Tk_Width(tkwin), Tk_Height(tkwin)}};

        /*
         * The info struct has integer fields, which will be converted to
         * floats in the drawing routine.  All of values provided in the info
         * struct, namely min, max, value, and viewSize are only defined up to
         * an arbitrary scale factor.  To avoid roundoff error we scale so
         * that the viewSize is a large float which is smaller than the
         * largest int.
         */


	HIThemeTrackDrawInfo info = {
	    .version = 0,
	    .bounds = troughBounds,
	    .min = 0,
	    .attributes = kThemeTrackShowThumb |
		kThemeTrackThumbRgnIsNotGhost,
	    .enableState = kThemeTrackActive
	};
	factor = RangeToFactor(100.0);
	if (orientation == TTK_ORIENT_HORIZONTAL) {
	    trackSize = troughBounds.size.width;
	    thumbSize = b.width;
	    fraction = b.x / trackSize;


	} else {

	    trackSize = troughBounds.size.height;
	    thumbSize = b.height;
	    fraction = b.y / trackSize;
	}
	visibleSize = (thumbSize / trackSize) * factor;
	info.max = factor - visibleSize;
	info.trackInfo.scrollbar.viewsize = visibleSize;
	if ([NSApp macMinorVersion] < 8 ||
	    orientation == TTK_ORIENT_HORIZONTAL) {
	    info.value = factor * fraction;
	} else {
	    info.value = info.max - factor * fraction;
	}
	if ((state & TTK_STATE_PRESSED) ||
	    (state & TTK_STATE_HOVER)) {
	    info.trackInfo.scrollbar.pressState = kThemeThumbPressed;
	} else {
	    info.trackInfo.scrollbar.pressState = 0;
	}

		|| (Tcl_WideUInt)w2 >= (1<<28)) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "exponent too large", -1));
	    return GENERAL_ARITHMETIC_ERROR;
	}
	Tcl_TakeBignumFromObj(NULL, valuePtr, &big1);
	mp_init(&bigResult);
	mp_expt_d(&big1, w2, &bigResult);
	mp_clear(&big1);
	BIG_RESULT(&bigResult);
    }

    case INST_ADD:
    case INST_SUB:
    case INST_MULT:

		|| (Tcl_WideUInt)w2 >= (1<<28)) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "exponent too large", -1));
	    return GENERAL_ARITHMETIC_ERROR;
	}
	Tcl_TakeBignumFromObj(NULL, valuePtr, &big1);
	mp_init(&bigResult);
	mp_expt_d(&big1, (mp_digit)w2, &bigResult);
	mp_clear(&big1);
	BIG_RESULT(&bigResult);
    }

    case INST_ADD:
    case INST_SUB:
    case INST_MULT:

    unsigned int size, allocsize;

    allocsize = size = strlen(string) + 1;
    if (size < sizeof(hPtr->key)) {
	allocsize = sizeof(hPtr->key);
    }
    hPtr = ckalloc(TclOffset(Tcl_HashEntry, key) + allocsize);

    memcpy(hPtr->key.string, string, size);
    hPtr->clientData = 0;
    return hPtr;
}
 
/*
 *----------------------------------------------------------------------

    unsigned int size, allocsize;

    allocsize = size = strlen(string) + 1;
    if (size < sizeof(hPtr->key)) {
	allocsize = sizeof(hPtr->key);
    }
    hPtr = ckalloc(TclOffset(Tcl_HashEntry, key) + allocsize);
    memset(hPtr, 0, sizeof(Tcl_HashEntry) + allocsize - sizeof(hPtr->key));
    memcpy(hPtr->key.string, string, size);
    hPtr->clientData = 0;
    return hPtr;
}
 
/*
 *----------------------------------------------------------------------

  cp -p undroidwish ${APP}/Contents/MacOS
  cp -p sdl2tk/sdl/undroidwish.icns sdl2tk/sdl/undroidwish.tiff \
    ${APP}/Contents/Resources
  cp -p sdl2tk/sdl/undroidwish-Info.plist ${APP}/Contents/Info.plist
  (
    cd ${APPDIR}
    # provide some symlinked apps
    for f in tksqlite bugz zint dungfork vncviewer tkmc helpviewer stardom TSB ; do
      mkdir -p ${f}.app/Contents
      ln -sf ../../undroidwish.app/Contents/MacOS ${f}.app/Contents
      ln -sf ../../undroidwish.app/Contents/Resources ${f}.app/Contents
      ( cd undroidwish.app/Contents/MacOS ; ln -s undroidwish $f )
      cp undroidwish.app/Contents/Info.plist ${f}.app/Contents
      perl -pi -e 's@<string>undroidawish</string>@<string>'$f'</string>@g' \
        ${f}.app/Contents/Info.plist
    done
    if test -d ${AWDIR}/assets/tkchat* ; then
      mkdir -p tkchat.app/Contents
      ln -sf ../../undroidwish.app/Contents/MacOS tkchat.app/Contents
      ln -sf ../../undroidwish.app/Contents/Resources tkchat.app/Contents
      ( cd undroidwish.app/Contents/MacOS ; ln -s undroidwish tkchat )

  cp -p undroidwish ${APP}/Contents/MacOS
  cp -p sdl2tk/sdl/undroidwish.icns sdl2tk/sdl/undroidwish.tiff \
    ${APP}/Contents/Resources
  cp -p sdl2tk/sdl/undroidwish-Info.plist ${APP}/Contents/Info.plist
  (
    cd ${APPDIR}
    # provide some symlinked apps
    for f in tksqlite bugz zint dungfork vncviewer tkmc helpviewer stardom ; do
      mkdir -p ${f}.app/Contents
      ln -sf ../../undroidwish.app/Contents/MacOS ${f}.app/Contents
      ln -sf ../../undroidwish.app/Contents/Resources ${f}.app/Contents
      ( cd undroidwish.app/Contents/MacOS ; ln -s undroidwish $f )
      cp undroidwish.app/Contents/Info.plist ${f}.app/Contents
      perl -pi -e 's@<string>undroidwish</string>@<string>'$f'</string>@g' \
        ${f}.app/Contents/Info.plist
    done
    if test -d ${AWDIR}/assets/tkchat* ; then
      mkdir -p tkchat.app/Contents
      ln -sf ../../undroidwish.app/Contents/MacOS tkchat.app/Contents
      ln -sf ../../undroidwish.app/Contents/Resources tkchat.app/Contents
      ( cd undroidwish.app/Contents/MacOS ; ln -s undroidwish tkchat )

	}
	return $all
    }

    proc canvascmd {c cmd args} {
	variable C
	set ret ""





	switch -glob -- $cmd {
	    cr* {
		# create
		set args [lassign $args type]
		set id [incr C($c,id)]
		set coords {}
		set count 0
		foreach arg $args {
		    if {[string is double $arg]} {
			lappend coords $arg
................................................................................
			set opt -tags
		    }
		    dict set C($c,$id) $opt $val
		}
		lappend C($c,dlist) $id
		set ret $id
	    }
	    bb* {
		# bbox, assumes measuring text item with "M"
		set ret {0 0 12 16}
	    }
	    cg* {
		# cget



		switch -glob -- [lindex $args 0] {


		    -bd - -bo* {
			set ret 0
		    }
		    -wi* {
			set ret $C($c,width)
		    }
		    -he* {
			set ret $C($c,height)
		    }
		}
	    }
	    ra* {
		# raise
		lassign $args tags
		set all $C($c,dlist)
		foreach t [tagfind $c $tags] {
		    set n [lsearch -exact $all $t]
		    if {$n >= 0} {
			set all [lreplace $all $n $n]
			lappend all $t
		    }
		}
		set C($c,dlist) $all
	    }
	    lo* {
		# lower
		lassign $args tags
		set all $C($c,dlist)
		foreach t [tagfind $c $tags] {
		    set n [lsearch -exact $all $t]
		    if {$n >= 0} {
			set all [lreplace $all $n $n]
			set all [linsert $all 0 $t]
		    }
		}
		set C($c,dlist) $all
	    }
	    des* {
		# destroy
		set cmd $C($c,cmd)
		foreach name [array names C $c,*] {
		    unset C($name)
		}
		rename "::$cmd" {}
	    }
	    de* {
		# delete
		lassign $args tags
		set all $C($c,dlist)
		foreach t [tagfind $c $tags] {
		    set n [lsearch -exact $all $t]
		    if {$n >= 0} {
			set all [lreplace $all $n $n]
			unset C($c,$t)
		    }
		}
		set C($c,dlist) $all
	    }
	    coo* {
		# coords
		set coords [lassign $args id]
		if {![info exists C($c,$id)]} {
		    foreach item $C($c,dlist) {
			set t [dict get $C($c,$item) -tags]
			if {$id in $t} {
			    if {[llength $coords]} {
				dict set C($c,$item) -coords $coords
................................................................................
		    }
		} elseif {[llength $coords]} {
		    dict set C($c,$id) -coords $coords
		} else {
		    set ret [dict get $C($c,$id) -coords]
		}
	    }
	    fi* {
		# find ?withtag?
		set args [lassign $args tags]
		if {$tags eq "withtag"} {
		    lassign $args tags
		}
		set ret [tagfind $c $tags]
	    }
	    sv* {
		# svg
		set vx ""
		set vy ""
		set vw ""
		set vh ""
		lassign $args vx vy vw vh
		package require can2svg
		set xml "<?xml version='1.0'?>\n"
................................................................................
	set C($cid,cmd) $cmd
	set C($cid,dlist) {}
	set C($cid,width) 640
	set C($cid,height) 480
	set C($cid,id) 0
	incr C(cid)
	foreach {key value} $args {



	    switch -glob -- $key {
		-wi* {
		    if {[scan $value %d value]} {
			set C($cid,width) $value
		    }
		}
		-he* {
		    if {[scan $value %d value]} {
			set C($cid,height) $value
		    }
		}
	    }
	}
	return $cmd

	}
	return $all
    }

    proc canvascmd {c cmd args} {
	variable C
	set ret ""
	if {![catch {tcl::prefix match {
	    create bbox cget raise lower destroy delete coords find svg
	} ncmd}]} {
	    set cmd $ncmd
	}
	switch -glob -- $cmd {

	    create {
		set args [lassign $args type]
		set id [incr C($c,id)]
		set coords {}
		set count 0
		foreach arg $args {
		    if {[string is double $arg]} {
			lappend coords $arg
................................................................................
			set opt -tags
		    }
		    dict set C($c,$id) $opt $val
		}
		lappend C($c,dlist) $id
		set ret $id
	    }
	    bbox {
		# assumes measuring text item with "M"
		set ret {0 0 12 16}
	    }

	    cget {
		if {[catch {tcl::prefix match {
		    -bd -borderwidth -width -height
		} [lindex $args 0]} opt]} {
		    set opt [lindex $args 0]
		}
		switch -glob -- $opt {
		    -bd - -borderwidth {
			set ret 0
		    }
		    -width {
			set ret $C($c,width)
		    }
		    -height {
			set ret $C($c,height)
		    }
		}
	    }

	    raise {
		lassign $args tags
		set all $C($c,dlist)
		foreach t [tagfind $c $tags] {
		    set n [lsearch -exact $all $t]
		    if {$n >= 0} {
			set all [lreplace $all $n $n]
			lappend all $t
		    }
		}
		set C($c,dlist) $all
	    }

	    lower {
		lassign $args tags
		set all $C($c,dlist)
		foreach t [tagfind $c $tags] {
		    set n [lsearch -exact $all $t]
		    if {$n >= 0} {
			set all [lreplace $all $n $n]
			set all [linsert $all 0 $t]
		    }
		}
		set C($c,dlist) $all
	    }

	    destroy {
		set cmd $C($c,cmd)
		foreach name [array names C $c,*] {
		    unset C($name)
		}
		rename "::$cmd" {}
	    }

	    delete {
		lassign $args tags
		set all $C($c,dlist)
		foreach t [tagfind $c $tags] {
		    set n [lsearch -exact $all $t]
		    if {$n >= 0} {
			set all [lreplace $all $n $n]
			unset C($c,$t)
		    }
		}
		set C($c,dlist) $all
	    }

	    coords {
		set coords [lassign $args id]
		if {![info exists C($c,$id)]} {
		    foreach item $C($c,dlist) {
			set t [dict get $C($c,$item) -tags]
			if {$id in $t} {
			    if {[llength $coords]} {
				dict set C($c,$item) -coords $coords
................................................................................
		    }
		} elseif {[llength $coords]} {
		    dict set C($c,$id) -coords $coords
		} else {
		    set ret [dict get $C($c,$id) -coords]
		}
	    }
	    find {
		# find ?withtag?
		set args [lassign $args tags]
		if {$tags eq "withtag"} {
		    lassign $args tags
		}
		set ret [tagfind $c $tags]
	    }

	    svg {
		set vx ""
		set vy ""
		set vw ""
		set vh ""
		lassign $args vx vy vw vh
		package require can2svg
		set xml "<?xml version='1.0'?>\n"
................................................................................
	set C($cid,cmd) $cmd
	set C($cid,dlist) {}
	set C($cid,width) 640
	set C($cid,height) 480
	set C($cid,id) 0
	incr C(cid)
	foreach {key value} $args {
	    if {![catch {tcl::prefix match {-width -height} $key} nkey]} {
		set key $nkey
	    }
	    switch -glob -- $key {
		-width {
		    if {[scan $value %d value]} {
			set C($cid,width) $value
		    }
		}
		-height {
		    if {[scan $value %d value]} {
			set C($cid,height) $value
		    }
		}
	    }
	}
	return $cmd