Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_pointer_action.h

 // Copyright 2015 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_SYNTHETIC_POINTER_ACTION_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_POINTER_ACTION_H_
 
+#include <array>
 #include "base/macros.h"
 #include "content/browser/renderer_host/input/synthetic_gesture.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 #include "content/browser/renderer_host/input/synthetic_pointer.h"
 #include "content/common/content_export.h"
 #include "content/common/input/synthetic_pointer_action_params.h"
 
+using blink::WebTouchEvent;
+
 namespace content {
 
 class CONTENT_EXPORT SyntheticPointerAction : public SyntheticGesture {
  public:
+  using IndexMap = std::array<int, WebTouchEvent::touchesLengthCap>;
+
   explicit SyntheticPointerAction(const SyntheticPointerActionParams& params);
-  SyntheticPointerAction(const SyntheticPointerActionParams& params,
-                         SyntheticPointer* synthetic_pointer);
+  SyntheticPointerAction(
+      std::unique_ptr<std::vector<SyntheticPointerActionParams>> param_list,
+      SyntheticPointer* synthetic_pointer,
+      IndexMap* index_map);
   ~SyntheticPointerAction() override;
 
   SyntheticGesture::Result ForwardInputEvents(
       const base::TimeTicks& timestamp,
       SyntheticGestureTarget* target) override;
 
-  void ForwardTouchOrMouseInputEvents(const base::TimeTicks& timestamp,
-                                      SyntheticGestureTarget* target);
+  SyntheticGesture::Result ForwardTouchOrMouseInputEvents(
+      const base::TimeTicks& timestamp,
+      SyntheticGestureTarget* target);
+
+  void SetSyntheticPointer(SyntheticPointer* synthetic_pointer) {
+    synthetic_pointer_ = synthetic_pointer;
+  }
+
+  int GetPointIndex(int index) const;
+
+  void SetPointIndex(int index, int point_index) {
+    (*index_map_)[index] = point_index;
+  }
 
  private:
+  // This is passed from SyntheticPointerActionController, which will reset its
+  // value to push a new patch of action parameters.

[tdresser, 2016/05/31 13:44:26]

patch -> batch

[lanwei, 2016/06/02 13:26:26]

Done.

+  // This contains a list of pointer actions which will be dispatched together.
+  const std::unique_ptr<std::vector<SyntheticPointerActionParams>> param_list_;
+  // These two objects are owned by SyntheticPointerActionController, which
+  // will manage their lifetime by initiating them when it starts processing a
+  // pointer action sequence and resets them when it finishes.

[tdresser, 2016/05/31 13:44:26]

resets -> resetting

[lanwei, 2016/06/02 13:26:27]

Done.

+  SyntheticPointer* synthetic_pointer_;
+  IndexMap* index_map_;
+
   SyntheticPointerActionParams params_;
-  SyntheticPointer* synthetic_pointer_;
 
   DISALLOW_COPY_AND_ASSIGN(SyntheticPointerAction);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_POINTER_ACTION_H_