cros: Arrow key traversal in views.

ui/views/focus/focus_manager.h

 // Copyright (c) 2012 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 UI_VIEWS_FOCUS_FOCUS_MANAGER_H_
 #define UI_VIEWS_FOCUS_FOCUS_MANAGER_H_
 
 #include <list>
 #include <map>
 
@@ skipping 132 matching lines @@
   };
 
   enum FocusCycleWrappingBehavior {
     kWrap,
     kNoWrap
   };
 
   FocusManager(Widget* widget, FocusManagerDelegate* delegate);
   virtual ~FocusManager();
 
-  // Processes the passed key event for accelerators and tab traversal.
+  // Processes the passed key event for accelerators and keyboard traversal.
   // Returns false if the event has been consumed and should not be processed
   // further.
   bool OnKeyEvent(const ui::KeyEvent& event);
 
   // Returns true is the specified is part of the hierarchy of the window
   // associated with this FocusManager.
   bool ContainsView(View* view);
 
   // Advances the focus (backward if reverse is true).
   void AdvanceFocus(bool reverse);
@@ skipping 125 matching lines @@
   // order to trap keyboard focus within that pane. If |wrap| is kWrap,
   // it keeps cycling within this widget, otherwise it returns false after
   // reaching the last pane so that focus can cycle to another widget.
   bool RotatePaneFocus(Direction direction, FocusCycleWrappingBehavior wrap);
 
   // Convenience method that returns true if the passed |key_event| should
   // trigger tab traversal (if it is a TAB key press with or without SHIFT
   // pressed).
   static bool IsTabTraversalKeyEvent(const ui::KeyEvent& key_event);
 
+  // Sets whether arrow key traversal is enabled. When enabled, right/down key
+  // behaves like tab and left/up key behaves like shift-tab. Note when this
+  // is enabled, the arrow key movement within grouped views are disabled.
+  static void set_arrow_key_traversal_enabled(bool enabled) {
+    arrow_key_traversal_enabled_ = enabled;
+  }
+  // Returns whether arrow key traversal is enabled.
+  static bool arrow_key_traversal_enabled() {
+    return arrow_key_traversal_enabled_;
+  }
+
  private:
   // Returns the next focusable view.
   View* GetNextFocusableView(View* starting_view, bool reverse, bool dont_loop);
 
   // Returns the focusable view found in the FocusTraversable specified starting
   // at the specified view. This traverses down along the FocusTraversable
   // hierarchy.
   // Returns NULL if no focusable view were found.
   View* FindFocusableView(FocusTraversable* focus_traversable,
                           View* starting_view,
                           bool reverse);
 
+  // Process arrow key traversal. Returns true if the event has been consumed
+  // and should not be processed further.
+  bool ProcessArrowKeyTraversal(const ui::KeyEvent& event);
+
   // Keeps track of whether shortcut handling is currently suspended.
   static bool shortcut_handling_suspended_;
 
+  // Whether arrow key traversal is enabled.
+  static bool arrow_key_traversal_enabled_;
+
   // The top-level Widget this FocusManager is associated with.
   Widget* widget_;
 
   // The object which handles an accelerator when |accelerator_manager_| doesn't
   // handle it.
   scoped_ptr<FocusManagerDelegate> delegate_;
 
   // The view that currently is focused.
   View* focused_view_;
 
@@ skipping 12 matching lines @@
 
   // See description above getter.
   bool is_changing_focus_;
 
   DISALLOW_COPY_AND_ASSIGN(FocusManager);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_FOCUS_FOCUS_MANAGER_H_