NSDockTile - Implement methods to update the icon and show badge (#185)

NSDockTile - Implement methods to update the icon and show badge using a NSCustomImageRep. Link the NSDockTile view with the AppIcon window contentView.
GSTheme - add badgeColor color and corresponding methods to theme background, decoration and text color

Source/NSDockTile.m

@@ -1,29 +1,43 @@
 /* Implementation of class NSDockTile
-   Copyright (C) 2019 Free Software Foundation, Inc.
-   
+   Copyright (C) 2019-2023 Free Software Foundation, Inc.
+
    By: Gregory John Casamento <greg.casamento@gmail.com>
+       Riccardo Mottola <rm@gnu.org>
+
    Date: Sat Nov 16 21:11:06 EST 2019
 
    This file is part of the GNUstep Library.
-   
+
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
-   
+
    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.
-   
+
    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free
    Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110 USA.
 */
 
-#import <AppKit/NSDockTile.h>
-#import <AppKit/NSView.h>
+#import "AppKit/NSApplication.h"
+#import "AppKit/NSDockTile.h"
+#import "AppKit/NSView.h"
+#import "AppKit/NSImage.h"
+#import "AppKit/NSImageRep.h"
+#import "AppKit/NSCustomImageRep.h"
+#import "AppKit/NSFont.h"
+#import "AppKit/NSStringDrawing.h"
+#import "AppKit/NSAttributedString.h"
+#import "AppKit/NSBezierPath.h"
+
+
+#import "GNUstepGUI/GSTheme.h"
+#import "GNUstepGUI/GSDisplayServer.h"
 
 @implementation NSDockTile
 
@@ -32,11 +46,24 @@
   self = [super init];
   if (self != nil)
     {
-      NSRect rect = NSMakeRect(0,0,48,48);
-      _size = rect.size;
+      GSDisplayServer *server = GSCurrentServer();
+      NSSize size = [server iconSize]; 
+      NSRect rect = NSMakeRect(0, 0, size.width, size.height);
+      
+      _size = size;
       _contentView = [[NSView alloc] initWithFrame: rect];
       _badgeLabel = nil;
       _owner = nil;
+      _showsApplicationBadge = YES;
+      _appIconImage = [NSImage imageNamed: @"NSApplicationIcon"];
+      RETAIN(_appIconImage);
+      _imageRep = [[NSCustomImageRep alloc] initWithDrawSelector: @selector(draw) delegate: self];
+      [_imageRep setSize: [_appIconImage size]];
+      _dockTileImage = [[NSImage alloc] initWithSize: [_appIconImage size]];
+      [_dockTileImage setCacheMode: NSImageCacheNever]; // Only needed because NSImage caches NSCustomImageReps
+      [_dockTileImage addRepresentation: _imageRep];
+      RELEASE(_imageRep);
+      [NSApp setApplicationIconImage: _dockTileImage];
     }
   return self;
 }
@@ -45,6 +72,8 @@
 {
   RELEASE(_contentView);
   RELEASE(_badgeLabel);
+  RELEASE(_appIconImage);
+  RELEASE(_dockTileImage);
   [super release];
 }
 
@@ -57,8 +86,8 @@
 {
   ASSIGN(_contentView, contentView);
 }
-  
-- (NSSize) size 
+
+- (NSSize) size
 {
   return _size;
 }
@@ -81,6 +110,7 @@
 - (void) setShowsApplicationBadge: (BOOL)flag
 {
   _showsApplicationBadge = flag;
+  [self display];
 }
 
 - (NSString *) badgeLabel
@@ -91,6 +121,7 @@
 - (void) setBadgeLabel: (NSString *)label
 {
   ASSIGNCOPY(_badgeLabel, label);
+  [self display];
 }
 
 - (void) display
@@ -98,5 +129,93 @@
   [_contentView setNeedsDisplay: YES];
 }
 
-@end
+- (void)draw
+{
+  [_appIconImage compositeToPoint: NSZeroPoint operation: NSCompositeCopy];
 
+  if (_showsApplicationBadge && _badgeLabel)
+    {
+      NSMutableDictionary *attrs;
+      NSPoint textLocation;
+      NSRect discRect;
+      NSSize discSize;
+      NSSize textSize;
+      int pad;
+      NSBezierPath *p;
+      NSPoint point;
+      CGFloat radius;
+      NSSize imageSize;
+      NSColor *badgeBackColor;
+      NSColor *badgeDecorationColor;
+      NSColor *badgeTextColor;
+      NSString *displayString;
+
+      badgeBackColor = [[GSTheme theme] badgeBackgroundColor];
+      badgeDecorationColor = [[GSTheme theme] badgeDecorationColor];
+      badgeTextColor = [[GSTheme theme] badgeTextColor];
+
+      imageSize = [_appIconImage size];
+
+      displayString = _badgeLabel;
+      if ([_badgeLabel length] > 5)
+	{
+	  displayString = [NSString stringWithFormat: @"%@\u2026%@", [_badgeLabel substringToIndex: 2], [_badgeLabel substringFromIndex: [_badgeLabel  length]-2]];
+	}
+
+      attrs = [[NSMutableDictionary alloc] init];
+      [attrs setObject: [NSFont boldSystemFontOfSize: imageSize.width/5]  forKey: NSFontAttributeName];
+      [attrs setObject: badgeTextColor  forKey: NSForegroundColorAttributeName];
+
+      textSize = [displayString sizeWithAttributes: attrs];
+
+      pad = imageSize.width / 10;
+      discSize = textSize;
+      if (discSize.width < 12)
+	{
+	  discSize.width = 12;
+	}
+      discSize.height += pad;
+      discSize.width += pad;
+
+      discRect = NSMakeRect(imageSize.width - discSize.width,
+			     imageSize.height - discSize.height,
+			     discSize.width,
+			     discSize.height);
+
+      textLocation = NSMakePoint(imageSize.width -  discSize.width + (discSize.width - textSize.width)/2,
+				 imageSize.height - discSize.height + (discSize.height - textSize.height)/2);
+
+      radius = discRect.size.height / 2.0;
+      point = discRect.origin;
+      point.x += radius;
+      point.y += radius - 0.5;
+
+      // left half-circle
+      p = [NSBezierPath bezierPath];
+      [p appendBezierPathWithArcWithCenter: point
+				    radius: radius
+				startAngle: 90.0
+				  endAngle: 270.0];
+
+      // line to first point and right halfcircle
+      point.x += discRect.size.width - discRect.size.height;
+      [p appendBezierPathWithArcWithCenter: point
+				    radius: radius
+				startAngle: 270.0
+				  endAngle: 90.0];
+      [p closePath];
+
+      [badgeBackColor set];
+      [p fill];
+
+      [p setLineWidth: 1.5];
+      [badgeDecorationColor set];
+      [p stroke];
+
+      [displayString drawAtPoint: textLocation  withAttributes: attrs];
+
+      RELEASE(attrs);
+    }
+}
+
+@end