Audio indicator: Mac UI

chrome/browser/ui/cocoa/tabs/tab_audio_indicator_view_mac.mm

+// Copyright (c) 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 "chrome/browser/ui/cocoa/tabs/tab_audio_indicator_view_mac.h"
+
+#include "chrome/browser/ui/tabs/tab_audio_indicator.h"
+#include "ui/gfx/canvas_skia_paint.h"
+#include "ui/gfx/rect.h"
+
+class TabAudioIndicatorDelegateMac : public TabAudioIndicator::Delegate {
+ public:
+  explicit TabAudioIndicatorDelegateMac(TabAudioIndicatorViewMac* view)
+      : view_(view) {
+  }
+
+  virtual ~TabAudioIndicatorDelegateMac() {}
+
+  virtual void ScheduleAudioIndicatorPaint() OVERRIDE {
+    [view_ setNeedsDisplay:YES];
+  }
+
+ private:
+  TabAudioIndicatorViewMac* view_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabAudioIndicatorDelegateMac);
+};
+
+@interface TabAudioIndicatorViewMac ()
+@end
+
+@implementation TabAudioIndicatorViewMac
+
+- (id)initWithFrame:(NSRect)frame {
+  if ((self = [super initWithFrame:frame])) {
+    delegate_.reset(new TabAudioIndicatorDelegateMac(self));
+    tabAudioIndicator_.reset(new TabAudioIndicator(delegate_.get()));
+  }
+  return self;
+}
+
+- (void)setIsPlayingAudio:(BOOL)isPlayingAudio {
+  tabAudioIndicator_->SetIsPlayingAudio(isPlayingAudio);
+}
+
+- (void)setBackgroundImage:(NSImage*)backgroundImage {
+  backgroundImage_.reset([backgroundImage retain]);
+}
+
+- (BOOL)isAnimating {
+  return tabAudioIndicator_->IsAnimating();
+}
+
+- (void)drawRect:(NSRect)rect {
+  [backgroundImage_ drawInRect:[self bounds]
+                      fromRect:NSZeroRect
+                     operation:NSCompositeSourceOver
+                      fraction:1];
+
+  gfx::CanvasSkiaPaint canvas(rect, false);
+  canvas.set_composite_alpha(true);
+  tabAudioIndicator_->Paint(&canvas, gfx::Rect(NSRectToCGRect([self bounds])));
+}
+
+@end