content/browser/renderer_host/ui_events_helper.cc

// Copyright (c) 2012 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/ui_events_helper.h"

#include "content/browser/renderer_host/input/web_input_event_util.h"
#include "content/common/input/web_touch_event_traits.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "ui/events/blink/blink_event_util.h"
#include "ui/events/event.h"
#include "ui/events/event_constants.h"

namespace {

ui::EventType WebTouchPointStateToEventType(
    blink::WebTouchPoint::State state) {
  switch (state) {
    case blink::WebTouchPoint::StateReleased:
      return ui::ET_TOUCH_RELEASED;

    case blink::WebTouchPoint::StatePressed:
      return ui::ET_TOUCH_PRESSED;

    case blink::WebTouchPoint::StateMoved:
      return ui::ET_TOUCH_MOVED;

    case blink::WebTouchPoint::StateCancelled:
      return ui::ET_TOUCH_CANCELLED;

    default:
      return ui::ET_UNKNOWN;
  }
}

}  // namespace

namespace content {

bool MakeUITouchEventsFromWebTouchEvents(
    const TouchEventWithLatencyInfo& touch_with_latency,
    ScopedVector<ui::TouchEvent>* list,
    TouchEventCoordinateSystem coordinate_system) {
  const blink::WebTouchEvent& touch = touch_with_latency.event;
  ui::EventType type = ui::ET_UNKNOWN;
  switch (touch.type) {
    case blink::WebInputEvent::TouchStart:
      type = ui::ET_TOUCH_PRESSED;
      break;
    case blink::WebInputEvent::TouchEnd:
      type = ui::ET_TOUCH_RELEASED;
      break;
    case blink::WebInputEvent::TouchMove:
      type = ui::ET_TOUCH_MOVED;
      break;
    case blink::WebInputEvent::TouchCancel:
      type = ui::ET_TOUCH_CANCELLED;
      break;
    default:
      NOTREACHED();
      return false;
  }

  int flags = WebEventModifiersToEventFlags(touch.modifiers);
  base::TimeDelta timestamp = base::TimeDelta::FromMicroseconds(
      static_cast<int64>(touch.timeStampSeconds * 1000000));
  for (unsigned i = 0; i < touch.touchesLength; ++i) {
    const blink::WebTouchPoint& point = touch.touches[i];
    if (WebTouchPointStateToEventType(point.state) != type)
      continue;
    // ui events start in the co-ordinate space of the EventDispatcher.
    gfx::PointF location;
    if (coordinate_system == LOCAL_COORDINATES)
      location = point.position;
    else
      location = point.screenPosition;
    ui::TouchEvent* uievent = new ui::TouchEvent(type,
          location,
          flags,
          point.id,
          timestamp,
          point.radiusX,
          point.radiusY,
          point.rotationAngle,
          point.force);
    uievent->set_latency(touch_with_latency.latency);
    list->push_back(uievent);
  }
  return true;
}

blink::WebGestureEvent MakeWebGestureEventFromUIEvent(
    const ui::GestureEvent& event) {
  return ui::CreateWebGestureEvent(event.details(), event.time_stamp(),
                                   event.location_f(), event.root_location_f(),
                                   event.flags());
}

}  // namespace content