Volume bubble added for ChromeOS.

chrome/browser/chromeos/volume_bubble.h

+// Copyright (c) 2010 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_VOLUME_BUBBLE_H_
+#define CHROME_BROWSER_CHROMEOS_VOLUME_BUBBLE_H_
+
+#include "app/active_window_watcher_x.h"
+#include "app/slide_animation.h"
+#include "base/singleton.h"
+#include "chrome/browser/views/info_bubble.h"
+
+namespace chromeos {
+
+class VolumeBubbleView;
+
+// Singleton class controlling volume bubble.
+class VolumeBubble : public InfoBubbleDelegate,
+                     public AnimationDelegate {
+ public:
+  static VolumeBubble* instance() {
+    return Singleton<VolumeBubble>::get();
+  }
+
+  void ShowVolumeBubble(int percent);
+
+ private:
+  friend struct DefaultSingletonTraits<VolumeBubble>;
+
+  VolumeBubble();
+  void OnTimeout();
+
+  // Overridden from InfoBubbleDelegate.
+  virtual void InfoBubbleClosing(InfoBubble* info_bubble,
+                                 bool closed_by_escape);
+  virtual bool CloseOnEscape() { return true; }
+  virtual bool FadeInOnShow() { return false; }
+
+  // Overridden from AnimationDelegate.
+  virtual void AnimationEnded(const Animation* animation);
+  virtual void AnimationProgressed(const Animation* animation);
+
+  // Previous and current volume percentages, -1 if not yet shown.
+  int previous_percent_;
+  int current_percent_;
+
+  // Currently shown bubble or NULL.
+  InfoBubble* bubble_;
+
+  // Its contents view, owned by InfoBubble.
+  VolumeBubbleView* view_;
+
+  SlideAnimation animation_;
+  base::OneShotTimer<VolumeBubble> timeout_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(VolumeBubble);
+};
+
+}  // namespace
+
+#endif  // CHROME_BROWSER_CHROMEOS_VOLUME_BUBBLE_H_