Menu for the OSX app launcher.

ui/base/cocoa/controls/hover_image_menu_button_cell.mm

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ui/base/cocoa/controls/hover_image_menu_button_cell.h"
+
+@implementation HoverImageMenuButtonCell
+
+@synthesize hovered = hovered_;
+
+- (id)initTextCell:(NSString*)stringValue
+         pullsDown:(BOOL)pullDown {
+  if ((self = [super initTextCell:stringValue
+                        pullsDown:pullDown])) {
+    [self setUsesItemFromMenu:NO];
+  }
+  return self;
+}
+
+- (void)setHoverImage:(NSImage*)newImage {
+  if ([hoverImage_ isEqual:newImage])
+    return;
+
+  hoverImage_.reset([newImage retain]);
+  if (hovered_)
+    [[self controlView] setNeedsDisplay:YES];
+}
+
+- (NSImage*)hoverImage {
+  return hoverImage_;
+}
+
+- (void)setHovered:(BOOL)hovered {
+  if (hovered_ == hovered)
+    return;
+
+  hovered_ = hovered;
+  [[self controlView] setNeedsDisplay:YES];
+}
+
+- (NSImage*)imageToDraw {
+  if ([self isHighlighted] && [self alternateImage])
+    return [self alternateImage];
+
+  if ([self isHovered] && [self hoverImage])
+    return [self hoverImage];
+
+  // Note that NSPopUpButtonCell updates the cell image when the [self menuItem]
+  // changes.
+  return [self image];
+}
+
+- (void)setDefaultImage:(NSImage*)defaultImage {
+  scoped_nsobject<NSMenuItem> buttonMenuItem([[NSMenuItem alloc] init]);
+  [buttonMenuItem setImage:defaultImage];
+  [self setMenuItem:buttonMenuItem];
+}
+
+- (void)drawWithFrame:(NSRect)cellFrame
+               inView:(NSView*)controlView {
+  [[self imageToDraw] drawInRect:cellFrame
+                        fromRect:NSZeroRect
+                       operation:NSCompositeSourceOver
+                        fraction:1.0
+                  respectFlipped:YES
+                           hints:nil];
+}
+
+@end