Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_pointer_action_controller.cc

+// Copyright 2016 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.
+
+#include "content/browser/renderer_host/input/synthetic_pointer_action_controller.h"
+
+namespace content {
+
+SyntheticPointerActionController::SyntheticPointerActionController()
+    : action_param_list_(new std::vector<SyntheticPointerActionParams>()) {
+  std::fill(index_map_.begin(), index_map_.end(), -1);
+}
+SyntheticPointerActionController::~SyntheticPointerActionController() {}
+
+std::unique_ptr<SyntheticGesture>
+SyntheticPointerActionController::CreateSyntheticPointerAction(
+    const SyntheticPointerActionParams& gesture_params) {
+  DCHECK(gesture_params.pointer_action_type() !=
+         SyntheticPointerActionParams::PointerActionType::NOT_INITIALIZED);
+  DCHECK(action_param_list_.get());
+  std::unique_ptr<SyntheticGesture> synthetic_gesture;
+  if (gesture_params.pointer_action_type() !=
+      SyntheticPointerActionParams::PointerActionType::PROCESS) {
+    action_param_list_->push_back(gesture_params);
+  }
+
+  if (gesture_params.pointer_action_type() ==
+          SyntheticPointerActionParams::PointerActionType::PROCESS ||
+      gesture_params.pointer_action_type() ==
+          SyntheticPointerActionParams::PointerActionType::FINISH) {
+    // TODO(lanwei): Will support multiple pointer types in the same stream
+    // later, see https://crbug.com/613303.
+    if (!action_param_list_->empty()) {
+      if (!synthetic_pointer_)
+        SetSyntheticPointer(gesture_params);
+
+      synthetic_gesture = std::unique_ptr<SyntheticGesture>(

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

You can replace = std::unique_ptr<SyntheticGesture> here with a .reset, can't
you?

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

Yes, thanks!

+          new SyntheticPointerAction(std::move(action_param_list_),
+                                     synthetic_pointer_.get(), &index_map_));
+      action_param_list_.reset(new std::vector<SyntheticPointerActionParams>());
+    }
+  }
+  return synthetic_gesture;
+}
+
+void SyntheticPointerActionController::SetSyntheticPointer(
+    const SyntheticPointerActionParams& gesture_params) {
+  SyntheticGestureParams::GestureSourceType gesture_source_type =
+      gesture_params.gesture_source_type;
+  if (gesture_source_type == SyntheticGestureParams::DEFAULT_INPUT)
+    gesture_source_type = default_type_;
+  DCHECK_NE(gesture_source_type, SyntheticGestureParams::DEFAULT_INPUT);
+  synthetic_pointer_ = SyntheticPointer::Create(gesture_source_type);
+}
+
+void SyntheticPointerActionController::ResetSyntheticPointer() {
+  synthetic_pointer_.reset();
+}
+
+void SyntheticPointerActionController::SetDefaultGestureSourceType(
+    SyntheticGestureParams::GestureSourceType default_type) {
+  default_type_ = default_type;
+}
+
+}  // namespace content