third_party/WebKit/Source/core/events/GestureEvent.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "core/events/GestureEvent.h"

#include "core/dom/Element.h"
#include "wtf/text/AtomicString.h"

namespace blink {

GestureEvent* GestureEvent::create(AbstractView* view,
                                   const PlatformGestureEvent& event) {
  AtomicString eventType;
  float deltaX = 0;
  float deltaY = 0;
  float velocityX = 0;
  float velocityY = 0;
  ScrollInertialPhase inertialPhase =
      ScrollInertialPhase::ScrollInertialPhaseUnknown;
  bool synthetic = false;
  ScrollGranularity deltaUnits = ScrollGranularity::ScrollByPrecisePixel;

  GestureSource source = GestureSourceUninitialized;
  switch (event.source()) {
    case PlatformGestureSourceTouchpad:
      source = GestureSourceTouchpad;
      break;
    case PlatformGestureSourceTouchscreen:
      source = GestureSourceTouchscreen;
      break;
    default:
      NOTREACHED();
  }

  switch (event.type()) {
    case PlatformEvent::GestureScrollBegin:
      eventType = EventTypeNames::gesturescrollstart;
      synthetic = event.synthetic();
      deltaUnits = event.deltaUnits();
      inertialPhase = event.inertialPhase();
      break;
    case PlatformEvent::GestureScrollEnd:
      eventType = EventTypeNames::gesturescrollend;
      synthetic = event.synthetic();
      deltaUnits = event.deltaUnits();
      inertialPhase = event.inertialPhase();
      break;
    case PlatformEvent::GestureScrollUpdate:
      // Only deltaX/Y are used when converting this
      // back to a PlatformGestureEvent.
      eventType = EventTypeNames::gesturescrollupdate;
      deltaX = event.deltaX();
      deltaY = event.deltaY();
      inertialPhase = event.inertialPhase();
      deltaUnits = event.deltaUnits();
      break;
    case PlatformEvent::GestureTap:
      eventType = EventTypeNames::gesturetap;
      break;
    case PlatformEvent::GestureTapUnconfirmed:
      eventType = EventTypeNames::gesturetapunconfirmed;
      break;
    case PlatformEvent::GestureTapDown:
      eventType = EventTypeNames::gesturetapdown;
      break;
    case PlatformEvent::GestureShowPress:
      eventType = EventTypeNames::gestureshowpress;
      break;
    case PlatformEvent::GestureLongPress:
      eventType = EventTypeNames::gesturelongpress;
      break;
    case PlatformEvent::GestureFlingStart:
      eventType = EventTypeNames::gestureflingstart;
      velocityX = event.velocityX();
      velocityY = event.velocityY();
      break;
    case PlatformEvent::GestureTwoFingerTap:
    case PlatformEvent::GesturePinchBegin:
    case PlatformEvent::GesturePinchEnd:
    case PlatformEvent::GesturePinchUpdate:
    case PlatformEvent::GestureTapDownCancel:
    default:
      return nullptr;
  }
  return new GestureEvent(
      eventType, view, event.globalPosition().x(), event.globalPosition().y(),
      event.position().x(), event.position().y(), event.getModifiers(), deltaX,
      deltaY, velocityX, velocityY, inertialPhase, synthetic, deltaUnits,
      event.timestamp(), event.resendingPluginId(), source);
}

const AtomicString& GestureEvent::interfaceName() const {
  // FIXME: when a GestureEvent.idl interface is defined, return the string
  // "GestureEvent".  Until that happens, do not advertise an interface that
  // does not exist, since it will trip up the bindings integrity checks.
  return UIEvent::interfaceName();
}

bool GestureEvent::isGestureEvent() const {
  return true;
}

GestureEvent::GestureEvent(const AtomicString& type,
                           AbstractView* view,
                           int screenX,
                           int screenY,
                           int clientX,
                           int clientY,
                           PlatformEvent::Modifiers modifiers,
                           float deltaX,
                           float deltaY,
                           float velocityX,
                           float velocityY,
                           ScrollInertialPhase inertialPhase,
                           bool synthetic,
                           ScrollGranularity deltaUnits,
                           double platformTimeStamp,
                           int resendingPluginId,
                           GestureSource source)
    : MouseRelatedEvent(type,
                        true,
                        true,
                        view,
                        0,
                        IntPoint(screenX, screenY),
                        IntPoint(clientX, clientY),
                        IntPoint(0, 0),
                        modifiers,
                        platformTimeStamp,
                        PositionType::Position),
      m_deltaX(deltaX),
      m_deltaY(deltaY),
      m_velocityX(velocityX),
      m_velocityY(velocityY),
      m_inertialPhase(inertialPhase),
      m_synthetic(synthetic),
      m_deltaUnits(deltaUnits),
      m_source(source),
      m_resendingPluginId(resendingPluginId) {}

DEFINE_TRACE(GestureEvent) {
  MouseRelatedEvent::trace(visitor);
}

}  // namespace blink