1 files changed, 99 insertions, 0 deletions
diff --git a/chromium/cc/input/top_controls_manager.h b/chromium/cc/input/top_controls_manager.h
new file mode 100644
index 00000000000..9bc3040d31a
--- /dev/null
+++ b/chromium/cc/input/top_controls_manager.h
@@ -0,0 +1,99 @@
+// 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.
+
+#ifndef CC_INPUT_TOP_CONTROLS_MANAGER_H_
+#define CC_INPUT_TOP_CONTROLS_MANAGER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "cc/input/top_controls_state.h"
+#include "cc/layers/layer_impl.h"
+#include "ui/gfx/size.h"
+#include "ui/gfx/vector2d_f.h"
+
+namespace base {
+class TimeTicks;
+}
+
+namespace cc {
+
+class KeyframedFloatAnimationCurve;
+class LayerTreeImpl;
+class TopControlsManagerClient;
+
+// Manages the position of the top controls.
+class CC_EXPORT TopControlsManager
+    : public base::SupportsWeakPtr<TopControlsManager> {
+ public:
+  enum AnimationDirection {
+    NO_ANIMATION,
+    SHOWING_CONTROLS,
+    HIDING_CONTROLS
+  };
+
+  static scoped_ptr<TopControlsManager> Create(
+      TopControlsManagerClient* client,
+      float top_controls_height,
+      float top_controls_show_threshold,
+      float top_controls_hide_threshold);
+  virtual ~TopControlsManager();
+
+  float controls_top_offset() { return controls_top_offset_; }
+  float content_top_offset() {
+    return controls_top_offset_ + top_controls_height_;
+  }
+  KeyframedFloatAnimationCurve* animation() {
+    return top_controls_animation_.get();
+  }
+  AnimationDirection animation_direction() { return animation_direction_; }
+
+  void UpdateTopControlsState(TopControlsState constraints,
+                              TopControlsState current,
+                              bool animate);
+
+  void ScrollBegin();
+  gfx::Vector2dF ScrollBy(const gfx::Vector2dF pending_delta);
+  void ScrollEnd();
+
+  gfx::Vector2dF Animate(base::TimeTicks monotonic_time);
+
+ protected:
+  TopControlsManager(TopControlsManagerClient* client,
+                     float top_controls_height,
+                     float top_controls_show_threshold,
+                     float top_controls_hide_threshold);
+
+ private:
+  void SetControlsTopOffset(float offset);
+  void ResetAnimations();
+  void SetupAnimation(AnimationDirection direction);
+  void StartAnimationIfNecessary();
+  bool IsAnimationCompleteAtTime(base::TimeTicks time);
+
+  TopControlsManagerClient* client_;  // The client manages the lifecycle of
+                                      // this.
+
+  scoped_ptr<KeyframedFloatAnimationCurve> top_controls_animation_;
+  AnimationDirection animation_direction_;
+  TopControlsState permitted_state_;
+  float controls_top_offset_;
+  float top_controls_height_;
+
+  float current_scroll_delta_;
+  float controls_scroll_begin_offset_;
+
+  // The height of the visible top control such that it must be shown when
+  // the user stops the scroll.
+  float top_controls_show_height_;
+
+  // The height of the visible top control such that it must be hidden when
+  // the user stops the scroll.
+  float top_controls_hide_height_;
+
+  DISALLOW_COPY_AND_ASSIGN(TopControlsManager);
+};
+
+}  // namespace cc
+
+#endif  // CC_INPUT_TOP_CONTROLS_MANAGER_H_