[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 143 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.
+  // Provided in order to set the initial bounds for the header to animate from.
+  bool first_time_;

[bruthig, 2016/08/30 17:57:33]

nit: A more explicit var name would be very helpful.

[varkha, 2016/09/02 11:22:51]

How is this?

+
   // 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.
@@ skipping 27 matching lines @@
   // 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_