Added arrow key navigation to Overview Mode

ash/wm/overview/window_selector.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_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 18 matching lines @@
 }
 
 namespace ui {
 class LocatedEvent;
 }
 
 namespace ash {
 class WindowSelectorDelegate;
 class WindowSelectorItem;
 class WindowSelectorTest;
+class WindowGrid;
 
 // The WindowSelector shows a grid of all of your windows, allowing to select
 // one by clicking or tapping on it.
 class ASH_EXPORT WindowSelector
     : public ui::EventHandler,
       public gfx::DisplayObserver,
       public aura::WindowObserver,
       public aura::client::ActivationChangeObserver {
  public:
+  enum Direction {
+    LEFT,
+    UP,
+    RIGHT,
+    DOWN
+  };
+
   typedef std::vector<aura::Window*> WindowList;
   typedef ScopedVector<WindowSelectorItem> WindowSelectorItemList;
 
   WindowSelector(const WindowList& windows,
                  WindowSelectorDelegate* delegate);
   virtual ~WindowSelector();
 
   // Cancels window selection.
   void CancelSelection();
 
+  // Called when the last window selector item from a grid is deleted.
+  void OnGridEmpty(WindowGrid* grid);
+
   // ui::EventHandler:
   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
 
   // gfx::DisplayObserver:
   virtual void OnDisplayAdded(const gfx::Display& display) OVERRIDE;
   virtual void OnDisplayRemoved(const gfx::Display& display) OVERRIDE;
   virtual void OnDisplayMetricsChanged(const gfx::Display& display,
                                        uint32_t metrics) OVERRIDE;
 
   // aura::WindowObserver:
   virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE;
-  virtual void OnWindowBoundsChanged(aura::Window* window,
-                                     const gfx::Rect& old_bounds,
-                                     const gfx::Rect& new_bounds) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   // aura::client::ActivationChangeObserver:
   virtual void OnWindowActivated(aura::Window* gained_active,
                                  aura::Window* lost_active) OVERRIDE;
   virtual void OnAttemptToReactivateWindow(
       aura::Window* request_active,
       aura::Window* actual_active) OVERRIDE;
 
  private:
   friend class WindowSelectorTest;
 
   // Begins positioning windows such that all windows are visible on the screen.
   void StartOverview();
 
-  // Returns true if a window is contained in the overview, and therefore should
-  // not be hidden prior to entering overview mode.
-  bool Contains(const aura::Window* window);
+  // Position all of the windows in the overview.
+  void PositionWindows(bool animate);
 
-  // Position all of the windows based on the current selection mode.
-  void PositionWindows(bool animate);
-  // Position all of the windows from |root_window| on |root_window|.
-  void PositionWindowsFromRoot(aura::Window* root_window, bool animate);
-
-  // Resets the stored window from RemoveFocusAndSetRestoreWindow to NULL. If
-  // Hide and track all hidden windows not in overview.
+  // Hide and track all hidden windows not in the overview item list.
   void HideAndTrackNonOverviewWindows();
 
   // |focus|, restores focus to the stored window.
   void ResetFocusRestoreWindow(bool focus);
 
-  // The collection of items in the overview wrapped by a helper class which
-  // restores their state and helps transform them to other root windows.
-  ScopedVector<WindowSelectorItem> windows_;
+  // Helper function that moves the selection widget to |direction| on the
+  // corresponding window grid.
+  void Move(Direction direction);
 
   // Tracks observed windows.
   std::set<aura::Window*> observed_windows_;
 
   // Weak pointer to the selector delegate which will be called when a
   // selection is made.
   WindowSelectorDelegate* delegate_;
 
   // A weak pointer to the window which was focused on beginning window
   // selection. If window selection is canceled the focus should be restored to
   // this window.
   aura::Window* restore_focus_window_;
 
   // True when performing operations that may cause window activations. This is
   // used to prevent handling the resulting expected activation.
   bool ignore_activations_;
 
+  // List of all the window overview grids, one for each root window.
+  ScopedVector<WindowGrid> grid_list_;
+
   // The time when overview was started.
   base::Time overview_start_time_;
 
   // Tracks windows which were hidden because they were not part of the
   // overview.
   aura::WindowTracker hidden_windows_;
 
+  // Tracks the index of the root window the selection widget is in.
+  size_t selected_grid_index_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowSelector);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_