Support for Adaptive Handle Orientation

ui/touch_selection/touch_handle.h

Index: ui/touch_selection/touch_handle.h
diff --git a/ui/touch_selection/touch_handle.h b/ui/touch_selection/touch_handle.h
index 12c66d09983626db3c3f9b4a356aa80a2a9d9178..a668235cb963d91d06e43eea36c4e73cdf0d0cb1 100644
--- a/ui/touch_selection/touch_handle.h
+++ b/ui/touch_selection/touch_handle.h
@@ -24,7 +24,9 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandleDrawable {
  public:
   virtual ~TouchHandleDrawable() {}
   virtual void SetEnabled(bool enabled) = 0;
-  virtual void SetOrientation(TouchHandleOrientation orientation) = 0;
+  virtual void SetOrientation(TouchHandleOrientation orientation,
+                              bool mirror_vertical,
+                              bool mirror_horizontal) = 0;
   virtual void SetAlpha(float alpha) = 0;
   virtual void SetFocus(const gfx::PointF& position) = 0;
   virtual gfx::RectF GetVisibleBounds() const = 0;
@@ -74,7 +76,9 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   // Update the handle visuals to |orientation|.
   // Note: If the handle is being dragged, the orientation change will be
   // deferred until the drag has ceased.
-  void SetOrientation(TouchHandleOrientation orientation);
+  void SetOrientation(TouchHandleOrientation orientation,
+                      const gfx::RectF viewport_rect,
+                      const gfx::PointF handle_bottom);
 
   // Allows touch-dragging of the handle. Returns true if the event was
   // consumed, in which case the caller should cease further handling.
@@ -84,7 +88,12 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   // Returns true if an animation is active and requires further ticking.
   bool Animate(base::TimeTicks frame_time);
 
+  // Returns the visible bounds of the handle
+  gfx::RectF GetHandleBounds();
+
   bool is_dragging() const { return is_dragging_; }
+  bool is_inverted() const { return mirror_vertical_; }
+  bool is_flipped() const { return mirror_horizontal_; }
   const gfx::PointF& position() const { return position_; }
   TouchHandleOrientation orientation() const { return orientation_; }
 
@@ -94,6 +103,8 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   void BeginFade();
   void EndFade();
   void SetAlpha(float alpha);
+  bool SetInvertHandleParameters(const gfx::RectF viewport_rect,
+                                 const gfx::PointF handle_bottom);
 
   scoped_ptr<TouchHandleDrawable> drawable_;
 
@@ -102,6 +113,8 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   gfx::PointF position_;
   TouchHandleOrientation orientation_;
   TouchHandleOrientation deferred_orientation_;
+  gfx::RectF deferred_viewport_rect_;
+  gfx::PointF deferred_handle_bottom_;
 
   gfx::PointF touch_down_position_;
   gfx::Vector2dF touch_to_focus_offset_;
@@ -120,6 +133,10 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   bool is_dragging_;
   bool is_drag_within_tap_region_;
 
+  // Mirror variables determine if the handles should be inverted or not.
+  bool mirror_vertical_;
+  bool mirror_horizontal_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchHandle);
 };