content/browser/renderer_host/input/synthetic_smooth_scroll_gesture.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/renderer_host/input/synthetic_smooth_scroll_gesture.h"
   6
   7 namespace content {
   8
   9 SyntheticSmoothScrollGesture::SyntheticSmoothScrollGesture(
  10     const SyntheticSmoothScrollGestureParams& params)
  11     : params_(params) {
  12 }
  13
  14 SyntheticSmoothScrollGesture::~SyntheticSmoothScrollGesture() {
  15 }
  16
  17 SyntheticGesture::Result SyntheticSmoothScrollGesture::ForwardInputEvents(
  18     const base::TimeTicks& timestamp,
  19     SyntheticGestureTarget* target) {
  20   if (!move_gesture_) {
  21     if (!InitializeMoveGesture(params_.gesture_source_type, target))
  22       return SyntheticGesture::GESTURE_SOURCE_TYPE_NOT_IMPLEMENTED;
  23   }
  24   return move_gesture_->ForwardInputEvents(timestamp, target);
  25 }
  26
  27 SyntheticSmoothMoveGestureParams::InputType
  28 SyntheticSmoothScrollGesture::GetInputSourceType(
  29     SyntheticGestureParams::GestureSourceType gesture_source_type) {
  30   if (gesture_source_type == SyntheticGestureParams::MOUSE_INPUT)
  31     return SyntheticSmoothMoveGestureParams::MOUSE_WHEEL_INPUT;
  32   else
  33     return SyntheticSmoothMoveGestureParams::TOUCH_INPUT;
  34 }
  35
  36 bool SyntheticSmoothScrollGesture::InitializeMoveGesture(
  37     SyntheticGestureParams::GestureSourceType gesture_type,
  38     SyntheticGestureTarget* target) {
  39   if (gesture_type == SyntheticGestureParams::DEFAULT_INPUT)
  40     gesture_type = target->GetDefaultSyntheticGestureSourceType();
  41
  42   if (gesture_type == SyntheticGestureParams::TOUCH_INPUT ||
  43       gesture_type == SyntheticGestureParams::MOUSE_INPUT) {
  44     SyntheticSmoothMoveGestureParams move_params;
  45     move_params.start_point = params_.anchor;
  46     move_params.distances = params_.distances;
  47     move_params.speed_in_pixels_s = params_.speed_in_pixels_s;
  48     move_params.prevent_fling = params_.prevent_fling;
  49     move_params.input_type = GetInputSourceType(gesture_type);
  50     move_params.add_slop = true;
  51     move_gesture_.reset(new SyntheticSmoothMoveGesture(move_params));
  52     return true;
  53   }
  54   return false;
  55 }
  56
  57 }  // namespace content