Support longpress drag selection

ui/events/test/motion_event_test_utils.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_EVENTS_TEST_MOTION_EVENT_TEST_UTILS_H_
 #define UI_EVENTS_TEST_MOTION_EVENT_TEST_UTILS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 26 matching lines @@
                   float x2,
                   float y2);
   MockMotionEvent(Action action,
                   base::TimeTicks time,
                   const std::vector<gfx::PointF>& positions);
   MockMotionEvent(const MockMotionEvent& other);
 
   ~MockMotionEvent() override;
 
   // Utility methods.
-  void PressPoint(float x, float y);
-  void MovePoint(size_t index, float x, float y);
-  void ReleasePoint();
-  void CancelPoint();
-  void SetTouchMajor(float new_touch_major);
-  void SetRawOffset(float raw_offset_x, float raw_offset_y);
-  void SetToolType(size_t index, ToolType tool_type);
-  void SetPrimaryPointerId(int id);
+  MockMotionEvent& PressPoint(float x, float y);
+  MockMotionEvent& MovePoint(size_t index, float x, float y);
+  MockMotionEvent& ReleasePoint();
+  MockMotionEvent& CancelPoint();
+  MockMotionEvent& SetTouchMajor(float new_touch_major);
+  MockMotionEvent& SetRawOffset(float raw_offset_x, float raw_offset_y);
+  MockMotionEvent& SetToolType(size_t index, ToolType tool_type);
+  MockMotionEvent& SetPrimaryPointerId(int id);
 

[sadrul, 2015/05/14 22:44:36]

Interesting. I haven't seen this pattern used elsewhere in chrome ... are there
any?

[jdduke (slow), 2015/05/14 22:49:46]

Isn't this pretty common with builder objects (confessedly I haven't actually
used builders much in Chrome...)? Otherwise I haven't seen it used much either.
Regardless, it's convenient, and in tests it's sometimes fun to rebel against
conformity ;).

[sadrul, 2015/05/14 22:55:32]

Not sure. I don't think we have that many builders [that do this] in chrome. But
yeah, I quite like this.

  private:
   void PushPointer(float x, float y);
   void ResolvePointers();
 };
 
 std::string ToString(const MotionEvent& event);
 
 }  // namespace test
 }  // namespace ui
 
 #endif  // UI_EVENTS_TEST_MOTION_EVENT_TEST_UTILS_H_