[ash-md] Fades overview header in and out

ash/common/wm/overview/window_selector_item.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_WINDOW_SELECTOR_ITEM_H_
 #define ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 95 matching lines @@
   void RecomputeWindowTransforms();
 
   // Sends an accessibility event indicating that this window became selected
   // so that it's highlighted and announced if accessibility features are
   // enabled.
   void SendAccessibleSelectionEvent();
 
   // Closes |transform_window_|.
   void CloseWindow();
 
+  // Hides the original window header and sets shape or mask on a window.
+  // When masks are used, rounded corner |radius| can be specified.
+  // TODO(varkha): remove |radius|.
+  void HideHeaderAndSetShape(int radius);
+
   // Sets if the item is dimmed in the overview. Changing the value will also
   // change the visibility of the transform windows.
   void SetDimmed(bool dimmed);
   bool dimmed() const { return dimmed_; }
 
   const gfx::Rect& target_bounds() const { return target_bounds_; }
   static void set_use_mask(bool use_mask) { use_mask_ = use_mask; }
   static void set_use_shape(bool use_shape) { use_shape_ = use_shape; }
 
   // views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // WmWindowObserver:
   void OnWindowDestroying(WmWindow* window) override;
   void OnWindowTitleChanged(WmWindow* window) override;
 
  private:
   class CaptionContainerView;
+  class RoundedContainerView;
   friend class WindowSelectorTest;
 
   // Sets the bounds of this selector's items to |target_bounds| in
   // |root_window_|. The bounds change will be animated as specified
   // by |animation_type|.
   void SetItemBounds(const gfx::Rect& target_bounds,
                      OverviewAnimationType animation_type);
 
   // Changes the opacity of all the windows the item owns.
   void SetOpacity(float opacity);
@@ skipping 10 matching lines @@
   // |animation_type|.
   void UpdateHeaderLayout(OverviewAnimationType animation_type);
 
   // Animates opacity of the |transform_window_| and its caption to |opacity|
   // using |animation_type|.
   void AnimateOpacity(float opacity, OverviewAnimationType animation_type);
 
   // Updates the close buttons accessibility name.
   void UpdateCloseButtonAccessibilityName();
 
+  // Fades out a window caption when exiting overview mode.
+  void FadeOut(std::unique_ptr<views::Widget> widget);
+
   static bool hide_header() { return use_mask_ || use_shape_; }
 
   // True if the item is being shown in the overview, false if it's being
   // filtered.
   bool dimmed_;
 
   // The root window this item is being displayed on.
   WmWindow* root_window_;
 
   // The contained Window's wrapper.
   ScopedTransformOverviewWindow transform_window_;
 
   // The target bounds this selector item is fit within.
   gfx::Rect target_bounds_;
 
   // True if running SetItemBounds. This prevents recursive calls resulting from
   // the bounds update when calling ::wm::RecreateWindowLayers to copy
   // a window layer for display on another monitor.
   bool in_bounds_update_;
 
+  // True when |this| item is visually selected. Item header is made transparent
+  // when the item is selected.
+  bool selected_;
+
+  // True initially until the UpdateHeaderLayout is invoked for the first time.

[bruthig, 2016/09/02 16:00:13]

This seems inconsistent with where |first_time_update_| is set to true. i.e. in
WindowSelectorItem::CreateWindowLabel().  I would have expected it to be set at
the bottom of WindowSelectorItem::UpdateHeaderLayout().

[varkha, 2016/09/02 21:38:37]

I have removed this in favor for passing the stage (enter / update / exit) into
UpdateHeaderLayout.

+  // Provided in order to set the initial bounds for the header to animate from.
+  bool first_time_update_;
+
   // Label displaying its name (active tab for tabbed windows).
   // With Material Design this Widget owns |caption_container_view_| and is
   // shown above the |transform_window_|.
   // Otherwise it is shown under the window.
   std::unique_ptr<views::Widget> window_label_;
 
   // Shadow around the item in overview.
   std::unique_ptr<::wm::Shadow> shadow_;
 
-  // Label background widget used to fade in opacity when moving selection.
-  std::unique_ptr<views::Widget> window_label_selector_;
-
   // Container view that owns |window_label_button_view_| and |close_button_|.
   // Only used with Material Design.
   CaptionContainerView* caption_container_view_;
 
   // View for the label below the window or (with material design) above it.
   OverviewLabelButton* window_label_button_view_;
 
   // The close buttons widget container. Not used with Material Design.
   std::unique_ptr<views::Widget> close_button_widget_;
 
   // A close button for the window in this item. Owned by the
   // |caption_container_view_| with Material Design or by |close_button_widget_|
   // otherwise.
   views::ImageButton* close_button_;
 
   // Pointer to the WindowSelector that owns the WindowGrid containing |this|.
   // Guaranteed to be non-null for the lifetime of |this|.
   WindowSelector* window_selector_;
 
+  // Pointer to a view that covers the original header and has rounded top
+  // corners. This view can have its color and opacity animated.
+  RoundedContainerView* background_view_;
+
   // If true, mask the original window header while in overview and make corners
   // rounded using a mask layer. This has performance implications so it can be
   // disabled when there are many windows.
   static bool use_mask_;
 
   // If true, hide the original window header while in overview using alpha
   // shape. This has performance implications so it can be disabled when there
   // are many windows.
   static bool use_shape_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_