Add user action for changing the active window in Ash overview mode

ash/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_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 
 #include "ash/ash_export.h"
 #include "ash/wm/overview/scoped_transform_overview_window.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/scoped_window_targeter.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/button/label_button.h"
 
 namespace aura {
 class Window;
 }
 
 namespace views {
 class LabelButton;
 class Widget;
 }
 
 namespace ash {
 
+class WindowSelector;
+
 // This class represents an item in overview mode.
 class ASH_EXPORT WindowSelectorItem : public views::ButtonListener,
                                       public aura::WindowObserver {
  public:
   class OverviewLabelButton : public views::LabelButton {
    public:
     OverviewLabelButton(views::ButtonListener* listener,
                         const base::string16& text);
 
     ~OverviewLabelButton() override;
 
     void set_top_padding(int top_padding) { top_padding_ = top_padding; }
 
    protected:
     // views::LabelButton:
     gfx::Rect GetChildAreaBounds() override;
 
    private:
     // Padding on top of the button.
     int top_padding_;
 
     DISALLOW_COPY_AND_ASSIGN(OverviewLabelButton);
   };
 
-  explicit WindowSelectorItem(aura::Window* window);
+  WindowSelectorItem(aura::Window* window, WindowSelector* window_selector);
   ~WindowSelectorItem() override;
 
   aura::Window* GetWindow();
 
   // Returns the root window on which this item is shown.
   aura::Window* root_window() { return root_window_; }
 
   // Returns true if |target| is contained in this WindowSelectorItem.
   bool Contains(const aura::Window* target) const;
 
@@ skipping 86 matching lines @@
   // View for the label under the window.
   OverviewLabelButton* window_label_button_view_;
 
   // The close buttons widget container.
   views::Widget close_button_widget_;
 
   // An easy to access close button for the window in this item. Owned by the
   // close_button_widget_.
   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_;

[tdanderson, 2015/05/14 01:36:32]

Or should we instead have a non-owned pointer back to our owning WindowGrid
(which in turn has a non-owned pointer back to its owning WindowSelector)?

+
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_