Reland: Implement Aura side of unified touch text selection for contents

ui/touch_selection/touch_selection_controller.h

 // Copyright 2014 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_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_
 #define UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_
 
 #include "ui/base/touch/selection_bound.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/rect_f.h"
@@ skipping 24 matching lines @@
 // Controller for manipulating text selection via touch input.
 class UI_TOUCH_SELECTION_EXPORT TouchSelectionController
     : public TouchHandleClient {
  public:
   TouchSelectionController(TouchSelectionControllerClient* client,
                            base::TimeDelta tap_timeout,
                            float tap_slop,
                            bool show_on_tap_for_empty_editable);
   ~TouchSelectionController() override;
 
-  // To be called when the selection bounds have changed.
+  // To be called when the selection bounds info has been updated.
   // Note that such updates will trigger handle updates only if preceded
   // by an appropriate call to allow automatic showing.
-  void OnSelectionBoundsChanged(const SelectionBound& start,
+  // Return value specifies if anything has been updated or not.
+  bool OnSelectionBoundsUpdated(const SelectionBound& start,
                                 const SelectionBound& end);
 
   // 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.
   bool WillHandleTouchEvent(const MotionEvent& event);
 
   // To be called before forwarding a tap event. This allows automatically
   // showing the insertion handle from subsequent bounds changes.
   void OnTapEvent();
@@ skipping 16 matching lines @@
   // To be called when the editability of the focused region changes.
   void OnSelectionEditable(bool editable);
 
   // To be called when the contents of the focused region changes.
   void OnSelectionEmpty(bool empty);
 
   // Ticks an active animation, as requested to the client by |SetNeedsAnimate|.
   // Returns true if an animation is active and requires further ticking.
   bool Animate(base::TimeTicks animate_time);
 
+  const SelectionBound& start() const { return start_; }
+  const SelectionBound& end() const { return end_; }
+
+  bool is_insertion_active() const { return is_insertion_active_; }
+  bool is_selection_active() const { return is_selection_active_; }
+
  private:
   enum InputEventType { TAP, LONG_PRESS, INPUT_EVENT_TYPE_NONE };
 
   // TouchHandleClient implementation.
   void OnHandleDragBegin(const TouchHandle& handle) override;
   void OnHandleDragUpdate(const TouchHandle& handle,
                           const gfx::PointF& new_position) override;
   void OnHandleDragEnd(const TouchHandle& handle) override;
   void OnHandleTapped(const TouchHandle& handle) override;
   void SetNeedsAnimate() override;
@@ skipping 56 matching lines @@
   // Whether a selection handle was dragged during the current 'selection
   // session' - i.e. since the current selection has been activated.
   bool selection_handle_dragged_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchSelectionController);
 };
 
 }  // namespace ui
 
 #endif  // UI_TOUCH_SELECTION_TOUCH_SELECTION_CONTROLLER_H_