Make GestureTextSelector detect its own gestures

content/browser/renderer_host/input/gesture_text_selector.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 CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_TEXT_SELECTOR_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_TEXT_SELECTOR_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
+#include "ui/events/gesture_detection/gesture_listeners.h"
 
 namespace ui {
-struct GestureEventData;
+class GestureDetector;
 class MotionEvent;
 }
 
 namespace content {
 class GestureTextSelectorTest;
 
 // Interface with which GestureTextSelector can select, unselect, show
 // selection handles, or long press.
 class CONTENT_EXPORT GestureTextSelectorClient {
  public:
   virtual ~GestureTextSelectorClient() {}
 
   virtual void ShowSelectionHandlesAutomatically() = 0;
   virtual void SelectRange(float x1, float y1, float x2, float y2) = 0;
-  virtual void Unselect() = 0;
   virtual void LongPress(base::TimeTicks time, float x, float y) = 0;
 };
 
 // A class to handle gesture-based text selection, such as when clicking first
 // button on stylus input. It also generates a synthetic long press gesture on
 // tap so that a word can be selected or the contextual menu can be shown.
-class CONTENT_EXPORT GestureTextSelector {
+class CONTENT_EXPORT GestureTextSelector : public ui::SimpleGestureListener {
  public:
   explicit GestureTextSelector(GestureTextSelectorClient* client);
   virtual ~GestureTextSelector();
 
-  // This should be called after gesture detection but before associated
-  // gestures are dispatched. Returns whether it will consume |event|.
+  // This should be called before |event| is seen by the platform gesture
+  // detector or forwarded to web content.
   bool OnTouchEvent(const ui::MotionEvent& event);
 
-  // Returns whether it will consume the event.
-  bool OnGestureEvent(const ui::GestureEventData& gesture);
-
  private:
   friend class GestureTextSelectorTest;
   FRIEND_TEST_ALL_PREFIXES(GestureTextSelectorTest,
                            ShouldStartTextSelection);
 
+  // SimpleGestureListener implementation.
+  virtual bool OnSingleTapUp(const ui::MotionEvent& e) override;
+  virtual bool OnScroll(const ui::MotionEvent& e1,
+                        const ui::MotionEvent& e2,
+                        float distance_x,
+                        float distance_y) override;
+
   static bool ShouldStartTextSelection(const ui::MotionEvent& event);
 
   GestureTextSelectorClient* client_;
   bool text_selection_triggered_;
-  float anchor_x_;
-  float anchor_y_;
+  scoped_ptr<ui::GestureDetector> gesture_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureTextSelector);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_TEXT_SELECTOR_H_