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"
+
+#include "base/memory/scoped_nsobject.h"
+
+@implementation HoverImageMenuButtonCell
+
+@synthesize hovered = hovered_;
+
+- (void)setHoverImage:(NSImage*)newImage {
+  hoverImage_.reset([newImage retain]);
+  [[self controlView] setNeedsDisplay:YES];
+}
+
+- (NSImage*)hoverImage {
+  return hoverImage_;
+}
+
+- (NSImage*)imageToDraw {
+  if ([self isHighlighted] && [self alternateImage])
+    return [self alternateImage];
+
+  if ([self isHovered] && [self hoverImage])
+    return [self hoverImage];
+
+  return [self image];

[sail, 2013/05/31 19:07:03]

How does this work? Shouldn't this be [buttonMenuItem image]?

[tapted, 2013/06/03 12:49:18]

It does work - there's even tests ;). This felt more in line with how a cell
should retrieve its default image. Maybe it will cover the (hypothetical) case
for setUsesItemFromMenu:YES as well, but I haven't tested that.

I've added a comment, but let me know if I should change it.

+}
+
+- (void)setImage:(NSImage*)defaultImage {
+  [self setUsesItemFromMenu:NO];

[sail, 2013/05/31 19:07:03]

Since the button class explicitly states that the first menu item is not used I
think it makes sense to always enforce that. How about moving this to init
instead?

[tapted, 2013/06/03 12:49:18]

Done.

+  scoped_nsobject<NSMenuItem> buttonItem([[NSMenuItem alloc] init]);

[sail, 2013/05/31 19:07:03]

how about buttonMenuItem?

[tapted, 2013/06/03 12:49:18]

Done.

+  [buttonItem setImage:defaultImage];
+  [self setMenuItem:buttonItem];
+}
+
+- (void)drawWithFrame:(NSRect)cellFrame
+               inView:(NSView*)controlView {
+  [[self imageToDraw] drawInRect:cellFrame
+                        fromRect:NSZeroRect
+                       operation:NSCompositeSourceOver
+                        fraction:1.0
+                  respectFlipped:YES
+                           hints:nil];
+}
+
+@end