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/*
* Copyright (C) 2011 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 APPLE COMPUTER, INC. ``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
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PlatformGestureEvent_h
#define PlatformGestureEvent_h
#include "platform/PlatformEvent.h"
#include "platform/geometry/FloatPoint.h"
#include "platform/geometry/IntPoint.h"
#include "platform/geometry/IntSize.h"
#include "wtf/Assertions.h"
#include <string.h>
namespace blink {
enum PlatformGestureSource {
PlatformGestureSourceUninitialized,
PlatformGestureSourceTouchpad,
PlatformGestureSourceTouchscreen
};
class PlatformGestureEvent : public PlatformEvent {
public:
PlatformGestureEvent()
: PlatformEvent(PlatformEvent::GestureScrollBegin)
, m_source(PlatformGestureSourceUninitialized)
{
memset(&m_data, 0, sizeof(m_data));
}
PlatformGestureEvent(Type type, const IntPoint& position,
const IntPoint& globalPosition, const IntSize& area, double timestamp,
PlatformEvent::Modifiers modifiers, PlatformGestureSource source)
: PlatformEvent(type, modifiers, timestamp)
, m_position(position)
, m_globalPosition(globalPosition)
, m_area(area)
, m_source(source)
{
memset(&m_data, 0, sizeof(m_data));
}
void setScrollGestureData(float deltaX, float deltaY, float velocityX, float velocityY,
bool inertial, bool preventPropagation, int resendingPluginId)
{
ASSERT(type() == PlatformEvent::GestureScrollBegin
|| type() == PlatformEvent::GestureScrollUpdate
|| type() == PlatformEvent::GestureScrollEnd);
if (type() != GestureScrollUpdate) {
ASSERT(deltaX == 0);
ASSERT(deltaY == 0);
ASSERT(velocityX == 0);
ASSERT(velocityY == 0);
ASSERT(!preventPropagation);
}
if (type() == PlatformEvent::GestureScrollBegin)
ASSERT(!inertial);
m_data.m_scroll.m_deltaX = deltaX;
m_data.m_scroll.m_deltaY = deltaY;
m_data.m_scroll.m_velocityX = velocityX;
m_data.m_scroll.m_velocityY = velocityY;
m_data.m_scroll.m_inertial = inertial;
m_data.m_scroll.m_resendingPluginId = resendingPluginId;
m_data.m_scroll.m_preventPropagation = preventPropagation;
}
const IntPoint& position() const { return m_position; } // PlatformWindow coordinates.
const IntPoint& globalPosition() const { return m_globalPosition; } // Screen coordinates.
const IntSize& area() const { return m_area; }
PlatformGestureSource source() const { return m_source; }
float deltaX() const
{
ASSERT(m_type == PlatformEvent::GestureScrollUpdate);
return m_data.m_scroll.m_deltaX;
}
float deltaY() const
{
ASSERT(m_type == PlatformEvent::GestureScrollUpdate);
return m_data.m_scroll.m_deltaY;
}
int tapCount() const
{
ASSERT(m_type == PlatformEvent::GestureTap);
return m_data.m_tap.m_tapCount;
}
float velocityX() const
{
ASSERT(m_type == PlatformEvent::GestureScrollUpdate || m_type == PlatformEvent::GestureFlingStart);
return m_data.m_scroll.m_velocityX;
}
float velocityY() const
{
ASSERT(m_type == PlatformEvent::GestureScrollUpdate || m_type == PlatformEvent::GestureFlingStart);
return m_data.m_scroll.m_velocityY;
}
bool inertial() const
{
ASSERT(m_type == PlatformEvent::GestureScrollUpdate || m_type == PlatformEvent::GestureScrollEnd);
return m_data.m_scroll.m_inertial;
}
int resendingPluginId() const
{
if (m_type == PlatformEvent::GestureScrollUpdate
|| m_type == PlatformEvent::GestureScrollBegin
|| m_type == PlatformEvent::GestureScrollEnd)
return m_data.m_scroll.m_resendingPluginId;
// This function is called by *all* gesture event types in
// GestureEvent::Create(), so we return -1 for all other types.
return -1;
}
bool preventPropagation() const
{
// TODO(tdresser) Once we've decided if we're getting rid of scroll
// chaining, we should remove all scroll chaining related logic. See
// crbug.com/526462 for details.
ASSERT(m_type == PlatformEvent::GestureScrollUpdate);
return true;
}
float scale() const
{
ASSERT(m_type == PlatformEvent::GesturePinchUpdate);
return m_data.m_pinchUpdate.m_scale;
}
void applyTouchAdjustment(const IntPoint& adjustedPosition)
{
// Update the window-relative position of the event so that the node that was
// ultimately hit is under this point (i.e. elementFromPoint for the client
// co-ordinates in a 'click' event should yield the target). The global
// position is intentionally left unmodified because it's intended to reflect
// raw co-ordinates unrelated to any content.
m_position = adjustedPosition;
}
bool isScrollEvent() const
{
switch (m_type) {
case GestureScrollBegin:
case GestureScrollEnd:
case GestureScrollUpdate:
case GestureFlingStart:
case GesturePinchBegin:
case GesturePinchEnd:
case GesturePinchUpdate:
return true;
case GestureTap:
case GestureTapUnconfirmed:
case GestureTapDown:
case GestureShowPress:
case GestureTapDownCancel:
case GestureTwoFingerTap:
case GestureLongPress:
case GestureLongTap:
return false;
default:
ASSERT_NOT_REACHED();
return false;
}
}
protected:
IntPoint m_position;
IntPoint m_globalPosition;
IntSize m_area;
PlatformGestureSource m_source;
union {
struct {
int m_tapCount;
} m_tap;
struct {
float m_deltaX;
float m_deltaY;
float m_velocityX;
float m_velocityY;
int m_preventPropagation;
bool m_inertial;
int m_resendingPluginId;
} m_scroll;
struct {
float m_scale;
} m_pinchUpdate;
} m_data;
};
} // namespace blink
#endif // PlatformGestureEvent_h
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