Support for Adaptive Handle Orientation

ui/touch_selection/touch_selection_controller.h

Index: ui/touch_selection/touch_selection_controller.h
diff --git a/ui/touch_selection/touch_selection_controller.h b/ui/touch_selection/touch_selection_controller.h
index 72e2ae23fe81f6dc1e08aa5fdc1a107bb7028524..797b7556444b46046c8f6b48908d4b8aae1af283 100644
--- a/ui/touch_selection/touch_selection_controller.h
+++ b/ui/touch_selection/touch_selection_controller.h
@@ -56,6 +56,10 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
     // Defaults to 8 DIPs.
     float tap_slop;
 
+    // Controls whether adaptive orientation for selection handles is enabled.
+    // Defaults to false.
+    bool enable_adaptive_handle_orientation;
+
     // Controls whether drag selection after a longpress is enabled.
     // Defaults to false.
     bool enable_longpress_drag_selection;
@@ -75,6 +79,10 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
   void OnSelectionBoundsChanged(const SelectionBound& start,
                                 const SelectionBound& end);
 
+  // To be called when the viewport rect has been changed. This is used for
+  // setting the state of the handles.
+  void OnViewportChanged(const gfx::RectF viewport_rect);
+
   // Allows touch-dragging of the handle.
   // Returns true iff the event was consumed, in which case the caller should
   // cease further handling of the event.
@@ -148,6 +156,7 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
   void SetNeedsAnimate() override;
   scoped_ptr<TouchHandleDrawable> CreateDrawable() override;
   base::TimeDelta GetMaxTapDuration() const override;
+  bool IsAdaptiveHandleOrientationEnabled() const override;
 
   // LongPressDragSelectorClient implementation.
   void OnLongPressDragActiveStateChanged() override;
@@ -168,6 +177,7 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
   bool ActivateSelectionIfNecessary();
   void DeactivateSelection();
   void ForceNextUpdateIfInactive();
+  void UpdateHandleLayoutIfNecessary();
 
   bool WillHandleTouchEventForLongPressDrag(const MotionEvent& event);
   void SetTemporarilyHiddenForLongPressDrag(bool hidden);
@@ -218,6 +228,8 @@ class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
   // Longpress drag allows direct manipulation of longpress-initiated selection.
   LongPressDragSelector longpress_drag_selector_;
 
+  gfx::RectF viewport_rect_;
+
   base::TimeTicks selection_start_time_;
   // Whether a selection handle was dragged during the current 'selection
   // session' - i.e. since the current selection has been activated.