1 files changed, 69 insertions, 0 deletions
diff --git a/ui/base/animation/throb_animation.h b/ui/base/animation/throb_animation.h
new file mode 100644
index 0000000..21dc03b
--- /dev/null
+++ b/ui/base/animation/throb_animation.h
@@ -0,0 +1,69 @@
+// Copyright (c) 2011 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 UI_BASE_ANIMATION_THROB_ANIMATION_H_
+#define UI_BASE_ANIMATION_THROB_ANIMATION_H_
+#pragma once
+
+#include "ui/base/animation/slide_animation.h"
+
+namespace ui {
+
+// A subclass of SlideAnimation that can continually slide. All of the Animation
+// methods behave like that of SlideAnimation: transition to the next state.
+// The StartThrobbing method causes the ThrobAnimation to cycle between hidden
+// and shown for a set number of cycles.
+//
+// A ThrobAnimation has two durations: the duration used when behavior like
+// a SlideAnimation, and the duration used when throbbing.
+class ThrobAnimation : public SlideAnimation {
+ public:
+  explicit ThrobAnimation(AnimationDelegate* target);
+  virtual ~ThrobAnimation() {}
+
+  // Starts throbbing. cycles_til_stop gives the number of cycles to do before
+  // stopping. A negative value means "throb indefinitely".
+  void StartThrobbing(int cycles_til_stop);
+
+  // Sets the duration of the slide animation when throbbing.
+  void SetThrobDuration(int duration) { throb_duration_ = duration; }
+
+  // Overridden to reset to the slide duration.
+  virtual void Reset();
+  virtual void Show();
+  virtual void Hide();
+
+  // Overridden to maintain the slide duration.
+  virtual void SetSlideDuration(int duration);
+
+  // The number of cycles remaining until the animation stops.
+  void set_cycles_remaining(int value) { cycles_remaining_ = value; }
+  int cycles_remaining() const { return cycles_remaining_; }
+
+ protected:
+  // Overriden to continually throb (assuming we're throbbing).
+  virtual void Step(base::TimeTicks time_now);
+
+ private:
+  // Resets state such that we behave like SlideAnimation.
+  void ResetForSlide();
+
+  // Duration of the slide animation.
+  int slide_duration_;
+
+  // Duration of the slide animation when throbbing.
+  int throb_duration_;
+
+  // If throbbing, this is the number of cycles left.
+  int cycles_remaining_;
+
+  // Are we throbbing?
+  bool throbbing_;
+
+  DISALLOW_COPY_AND_ASSIGN(ThrobAnimation);
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_ANIMATION_THROB_ANIMATION_H_