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) {
+    SyntheticGestureParams::GestureSourceType gesture_type =
+        params_.gesture_source_type;
+    if (gesture_type == SyntheticGestureParams::DEFAULT_INPUT)
+      gesture_type = target->GetDefaultSyntheticGestureSourceType();
+
+    if (gesture_type == SyntheticGestureParams::TOUCH_INPUT ||
+        gesture_type == SyntheticGestureParams::MOUSE_INPUT) {

[picksi, 2015/02/20 11:51:18]

IMO The logic to determine the gesture_type should also be in a separate
function (also inside InitializeMoveGesture?) as it deals with stuff that
ForwardInputEvents shouldn't need to care about.

+      InitializeMoveGesture(gesture_type);
+    } else
+      return SyntheticGesture::GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED;
+  }
+  return move_gesture_->ForwardInputEvents(timestamp, target);
+}
+
+SyntheticSmoothMoveGesture::InputType
+SyntheticSmoothDragGesture::GetInputSourceType(
+    SyntheticGestureParams::GestureSourceType gesture_source_type) {
+  if (gesture_source_type == SyntheticGestureParams::MOUSE_INPUT)
+    return SyntheticSmoothMoveGesture::MOUSE_DRAG_INPUT;
+  else
+    return SyntheticSmoothMoveGesture::TOUCH_DRAG_INPUT;
+}
+
+void SyntheticSmoothDragGesture::InitializeMoveGesture(
+    SyntheticGestureParams::GestureSourceType gesture_type) {
+  bool prevent_fling = true;
+  move_gesture_.reset(new SyntheticSmoothMoveGesture(
+      GetInputSourceType(gesture_type), params_.start_point, params_.distances,
+      params_.speed_in_pixels_s, prevent_fling));
+}
+
+}  // namespace content