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 21 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 {
+    RIGHT,
+    DOWN,
+    LEFT,
+    UP
+  };
+
   typedef std::vector<aura::Window*> WindowList;
   typedef ScopedVector<WindowSelectorItem> WindowSelectorItemList;
 
   WindowSelector(const WindowList& windows,
                  WindowSelectorDelegate* delegate);
   virtual ~WindowSelector();
 
   // Choose |window| from the available windows to select.
   void SelectWindow(aura::Window* window);
 
@@ skipping 25 matching lines @@
   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();
 
-  // Position all of the windows based on the current selection mode.
+  // Position all of the windows in the overview.
   void PositionWindows(bool animate);
-  // Position all of the windows from |root_window| on |root_window|.
-  void PositionWindowsFromRoot(aura::Window* root_window, bool animate);
+
+  // Creates the WindowGrid objects and populates them with the current windows.
+  void CreateWindowGrids();
 
   // Resets the stored window from RemoveFocusAndSetRestoreWindow to NULL. If
   // Hide and track all hidden windows not in overview.
   void HideAndTrackNonOverviewWindows();
 
   // |focus|, restores focus to the stored window.
   void ResetFocusRestoreWindow(bool focus);
 
   // Returns the target of |event| or NULL if the event is not targeted at
   // any of the windows in the selector.
   aura::Window* GetEventTarget(ui::LocatedEvent* event);
 
   // Returns the top-level window selected by targeting |window| or NULL if
   // no overview window was found for |window|.
   aura::Window* GetTargetedWindow(aura::Window* window);
 
+  // Helper function that moves the selection widget to |direction| on the
+  // corresponding window grid.
+  void Move(Direction direction);
+
   // 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_;
 
   // 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 cursor client used to lock the current cursor during overview.
   aura::client::CursorClient* cursor_client_;
 
   // 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 root_index_;

[flackr, 2014/05/29 20:04:25]

nit: selected_grid_index_ or something like that.

[Nina, 2014/06/02 22:04:38]

Done.

+
   DISALLOW_COPY_AND_ASSIGN(WindowSelector);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_H_