Adding synthetic touch/mouse drag [Part1]

content/browser/renderer_host/input/synthetic_smooth_drag_gesture.cc

+// 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.
+
+#include "content/browser/renderer_host/input/synthetic_smooth_drag_gesture.h"
+
+namespace content {
+
+SyntheticSmoothDragGesture::SyntheticSmoothDragGesture(
+    const SyntheticSmoothDragGestureParams& params)
+    : params_(params) {
+}
+
+SyntheticSmoothDragGesture::~SyntheticSmoothDragGesture() {
+}
+
+SyntheticGesture::Result SyntheticSmoothDragGesture::ForwardInputEvents(
+    const base::TimeTicks& timestamp,
+    SyntheticGestureTarget* target) {
+  if (move_gesture_ == nullptr) {

[Sami, 2015/02/23 18:03:28]

nit: !move_gesture_ would be more idiomatic.

[ssid, 2015/02/23 19:10:36]

Done.

+    if (!InitializeMoveGesture(params_.gesture_source_type, target))
+      return SyntheticGesture::GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED;
+  }
+  return move_gesture_->ForwardInputEvents(timestamp, target);
+}
+
+SyntheticSmoothMoveGestureParams::InputType
+SyntheticSmoothDragGesture::GetInputSourceType(
+    SyntheticGestureParams::GestureSourceType gesture_source_type) {
+  if (gesture_source_type == SyntheticGestureParams::MOUSE_INPUT)
+    return SyntheticSmoothMoveGestureParams::MOUSE_DRAG_INPUT;
+  else
+    return SyntheticSmoothMoveGestureParams::TOUCH_INPUT;
+}
+
+bool SyntheticSmoothDragGesture::InitializeMoveGesture(
+    SyntheticGestureParams::GestureSourceType gesture_type,
+    SyntheticGestureTarget* target) {
+  if (gesture_type == SyntheticGestureParams::DEFAULT_INPUT)
+    gesture_type = target->GetDefaultSyntheticGestureSourceType();
+
+  if (gesture_type == SyntheticGestureParams::TOUCH_INPUT ||
+      gesture_type == SyntheticGestureParams::MOUSE_INPUT) {
+    SyntheticSmoothMoveGestureParams move_params(params_);
+    move_params.input_type = GetInputSourceType(gesture_type);
+    move_params.prevent_slop = true;
+    move_gesture_.reset(new SyntheticSmoothMoveGesture(move_params));
+    return true;
+  }
+  return false;
+}
+
+}  // namespace content