Handles users rotating screen too early

ash/rotator/screen_rotation_animator.h

 // Copyright 2015 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 ASH_ROTATOR_SCREEN_ROTATION_ANIMATOR_H_
 #define ASH_ROTATOR_SCREEN_ROTATION_ANIMATOR_H_
 
 #include <stdint.h>
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "ui/compositor/layer_tree_owner.h"
 #include "ui/display/display.h"
 
 namespace ash {
 
 // Utility to perform a screen rotation with an animation.
 class ASH_EXPORT ScreenRotationAnimator {
  public:
+  class ASH_EXPORT ScreenRotationAnimatorObserver {
+   public:
+    ScreenRotationAnimatorObserver();
+    virtual void OnEndedOrAbortedAnimation(
+        base::WeakPtr<ScreenRotationAnimator> animator);
+
+   protected:
+    ~ScreenRotationAnimatorObserver();
+  };
+
+  struct ScreenRotationRequest {
+    ScreenRotationAnimator* animator;
+    int64_t display_id;
+    display::Display::Rotation initial_rotation;
+    display::Display::Rotation new_rotation;
+    display::Display::RotationSource source;
+  };
+
   explicit ScreenRotationAnimator(int64_t display_id);
   ~ScreenRotationAnimator();
 
-  // Returns true if the screen rotation animation can be completed
-  // successfully. For example an animation is not possible if |display_id_|
-  // specifies a display::Display that is not currently active. See
-  // www.crbug.com/479503.
-  bool CanAnimate() const;
+  display::Display::Rotation GetCurrentRotation() const;
 
   // Rotates the display::Display specified by |display_id_| to the
   // |new_rotation|
   // orientation, for the given |source|. The rotation will also become active.
   // Clients should only call |Rotate()| if |CanAnimate()| returns true.
   void Rotate(display::Display::Rotation new_rotation,
               display::Display::RotationSource source);
 
+  int64_t display_id() const;

[bruthig, 2017/03/02 18:25:45]

You should inline the definition of simple getters in the .h file.

[wutao, 2017/03/03 02:45:52]

I move the simple getters and setters in the .h.

+
+  bool is_animating() const;
+  void set_is_animating(bool rotating);

[bruthig, 2017/03/02 18:25:45]

I think it is very odd that clients of the animator can change the
|is_animating_| value.  I would think that should all be handled inside of this.

[wutao, 2017/03/03 02:45:52]

I was debating myself where is the best to reset is_animating. Maybe the
layerCleanupObserver is good place when we delete the old layer tree owner?
Moved to there.

+
+  ScreenRotationAnimatorObserver* observer() const;
+  void SetObserver(ScreenRotationAnimatorObserver* observer);
+  void RemoveObserver();
+
+  ui::LayerTreeOwner* old_layer_tree_owner() const;
+  void reset_old_layer_tree_owner();
+  void set_old_layer_tree_owner(ui::LayerTreeOwner* layer_tree_owner);
+
+  ScreenRotationRequest* last_pending_request() const;
+  void reset_last_pending_request();
+
+  base::WeakPtr<ScreenRotationAnimator> WeakPtr();
+
  private:
   // The id of the display to rotate.
   int64_t display_id_;
+  bool is_animating_;
+  ScreenRotationAnimatorObserver* observer_;
+  std::unique_ptr<ui::LayerTreeOwner> old_layer_tree_owner_;
+  std::unique_ptr<ScreenRotationRequest> last_pending_request_;
+  base::WeakPtrFactory<ScreenRotationAnimator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenRotationAnimator);
 };
 
 }  // namespace ash
 
 #endif  // ASH_ROTATOR_SCREEN_ROTATION_ANIMATOR_H_