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..29b4ac678f7b32b58c49067a99826f171da28177 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;
@@ -66,10 +68,17 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   // If an animation is in-progress, it will be overriden appropriately.
   void SetVisible(bool visible, AnimationStyle animation_style);
 
-  // Update the handle placement to |position|.
+  // Update the handle placement to appropriate position based on mirror params.
   // Note: If a fade out animation is active or the handle is invisible, the
   // handle position will not be updated until the handle regains visibility.
-  void SetPosition(const gfx::PointF& position);
+  void UpdatePosition();
+
+  // Update the focus points for the handles. The Handle will be positioned
+  // either |top| or |bottom| based on the mirror parameters.
+  void SetFocus(const gfx::PointF& top, const gfx::PointF& bottom);
+
+  // Update the Viewport rect, based on which the handle decide its inversion
+  void SetViewportRect(const gfx::RectF viewport_rect);
 
   // Update the handle visuals to |orientation|.
   // Note: If the handle is being dragged, the orientation change will be
@@ -94,12 +103,16 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   void BeginFade();
   void EndFade();
   void SetAlpha(float alpha);
+  bool SetMirrorParameters();
 
   scoped_ptr<TouchHandleDrawable> drawable_;
 
   TouchHandleClient* const client_;
 
   gfx::PointF position_;
+  gfx::PointF focus_bottom_;
+  gfx::PointF focus_top_;
+  gfx::RectF viewport_rect_;
   TouchHandleOrientation orientation_;
   TouchHandleOrientation deferred_orientation_;
 
@@ -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);
 };