[ash-md] Fades overview header in and out

ash/common/wm/overview/scoped_transform_overview_window.h

 // 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 ASH_COMMON_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 #define ASH_COMMON_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 14 matching lines @@
 
 class ScopedOverviewAnimationSettings;
 class WmWindow;
 
 // Manages a window, and it's transient children, in the overview mode. This
 // class allows transforming the windows with a helper to determine the best
 // fit in certain bounds. The window's state is restored on destruction of this
 // object.
 class ASH_EXPORT ScopedTransformOverviewWindow {
  public:
+  class OverviewContentMask;
   using ScopedAnimationSettings =
       std::vector<std::unique_ptr<ScopedOverviewAnimationSettings>>;
 
   // Calculates and returns an optimal scale ratio. With MD this is only
   // taking into account |size.height()| as the width can vary. Without MD this
   // returns the scale that allows the item to fully fit within |size|.
   static float GetItemScale(const gfx::Size& source,
                             const gfx::Size& target,
                             int top_view_inset,
                             int title_height);
@@ skipping 68 matching lines @@
   void OnWindowDestroyed();
 
   // Prepares for overview mode by doing any necessary actions before entering.
   void PrepareForOverview();
 
   // Applies the |transform| to the overview window and all of its transient
   // children. With Material Design creates a mask layer with the bottom edge
   // using rounded corners of |radius|. When |use_mask| is set, hides the
   // original window header and uses rounded rectangle mask which may be
   // resource-intensive. When |use_shape| is set and |use_mask| is not, uses
-  // SetAlphaShape to mask the header.
+  // SetAlphaShape to mask the header. If |animate| is set, the shape or mask
+  // is set only upon the animation completion.
   void SetTransform(WmWindow* root_window,
                     const gfx::Transform& transform,
                     bool use_mask,
                     bool use_shape,
-                    float radius);
+                    float radius,
+                    bool animate);
 
   // Set's the opacity of the managed windows.
   void SetOpacity(float opacity);
 
   WmWindow* window() const { return window_; }
 
   // Closes the transient root of the window managed by |this|.
   void Close();
 
  private:
+  class OverviewWindowAnimationObserver;
   friend class WindowSelectorTest;
-  class OverviewContentMask;
 
   enum OriginalVisibility {
     ORIGINALLY_VISIBLE,
     ORIGINALLY_MINIMIZED,
     ORIGINALLY_DOCKED_MINIMIZED,
   };
 
   // Shows the window if it was minimized.
   void ShowWindowIfMinimized();
 
   // Closes the window managed by |this|.
   void CloseWidget();
 
   // Makes Close() execute synchronously when used in tests.
   static void SetImmediateCloseForTests();
 
   // A weak pointer to the real window in the overview.
   WmWindow* window_;
 
   // Mask layer that hides the original window header.
   std::unique_ptr<OverviewContentMask> mask_;
 
   // Original window shape, if it was set on a window.
   std::unique_ptr<SkRegion> original_window_shape_;
 
+  // Observes transform animation and hides the window header when the animation
+  // completes.
+  std::unique_ptr<OverviewWindowAnimationObserver> animation_observer_;
+
   // True after the |original_window_shape_| has been set or after it has
   // been determined that window shape was not originally set on the |window_|.
   bool determined_original_window_shape_;
 
   // Original visibility of |window_| upon entering overview mode that needs to
   // be restored unless the window gets selected.
   OriginalVisibility original_visibility_;
 
   // Tracks if this window was ignored by the shelf.
   bool ignored_by_shelf_;
@@ skipping 12 matching lines @@
   float original_opacity_;
 
   base::WeakPtrFactory<ScopedTransformOverviewWindow> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedTransformOverviewWindow);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_