gecko-dev/dom/events/TouchEvent.cpp

258 lines
7.3 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/Touch.h"
#include "mozilla/dom/TouchListBinding.h"
#include "mozilla/Preferences.h"
#include "mozilla/TouchEvents.h"
#include "nsContentUtils.h"
namespace mozilla {
#ifdef XP_WIN
namespace widget {
extern int32_t IsTouchDeviceSupportPresent();
} // namespace widget
#endif // #ifdef XP_WIN
namespace dom {
/******************************************************************************
* TouchList
*****************************************************************************/
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TouchList)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(TouchList, mParent, mPoints)
NS_IMPL_CYCLE_COLLECTING_ADDREF(TouchList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(TouchList)
JSObject*
TouchList::WrapObject(JSContext* aCx)
{
return TouchListBinding::Wrap(aCx, this);
}
// static
bool
TouchList::PrefEnabled(JSContext* aCx, JSObject* aGlobal)
{
return TouchEvent::PrefEnabled(aCx, aGlobal);
}
Touch*
TouchList::IdentifiedTouch(int32_t aIdentifier) const
{
for (uint32_t i = 0; i < mPoints.Length(); ++i) {
Touch* point = mPoints[i];
if (point && point->Identifier() == aIdentifier) {
return point;
}
}
return nullptr;
}
/******************************************************************************
* TouchEvent
*****************************************************************************/
TouchEvent::TouchEvent(EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetTouchEvent* aEvent)
: UIEvent(aOwner, aPresContext,
aEvent ? aEvent : new WidgetTouchEvent(false, 0, nullptr))
{
if (aEvent) {
mEventIsInternal = false;
for (uint32_t i = 0; i < aEvent->touches.Length(); ++i) {
Touch* touch = aEvent->touches[i];
touch->InitializePoints(mPresContext, aEvent);
}
} else {
mEventIsInternal = true;
mEvent->time = PR_Now();
}
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(TouchEvent, UIEvent,
mTouches,
mTargetTouches,
mChangedTouches)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TouchEvent)
NS_INTERFACE_MAP_END_INHERITING(UIEvent)
NS_IMPL_ADDREF_INHERITED(TouchEvent, UIEvent)
NS_IMPL_RELEASE_INHERITED(TouchEvent, UIEvent)
void
TouchEvent::InitTouchEvent(const nsAString& aType,
bool aCanBubble,
bool aCancelable,
nsIDOMWindow* aView,
int32_t aDetail,
bool aCtrlKey,
bool aAltKey,
bool aShiftKey,
bool aMetaKey,
TouchList* aTouches,
TouchList* aTargetTouches,
TouchList* aChangedTouches,
ErrorResult& aRv)
{
aRv = UIEvent::InitUIEvent(aType, aCanBubble, aCancelable, aView, aDetail);
if (aRv.Failed()) {
return;
}
mEvent->AsInputEvent()->InitBasicModifiers(aCtrlKey, aAltKey,
aShiftKey, aMetaKey);
mTouches = aTouches;
mTargetTouches = aTargetTouches;
mChangedTouches = aChangedTouches;
}
TouchList*
TouchEvent::Touches()
{
if (!mTouches) {
WidgetTouchEvent* touchEvent = mEvent->AsTouchEvent();
if (mEvent->message == NS_TOUCH_END || mEvent->message == NS_TOUCH_CANCEL) {
// for touchend events, remove any changed touches from the touches array
WidgetTouchEvent::AutoTouchArray unchangedTouches;
const WidgetTouchEvent::TouchArray& touches = touchEvent->touches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
if (!touches[i]->mChanged) {
unchangedTouches.AppendElement(touches[i]);
}
}
mTouches = new TouchList(ToSupports(this), unchangedTouches);
} else {
mTouches = new TouchList(ToSupports(this), touchEvent->touches);
}
}
return mTouches;
}
TouchList*
TouchEvent::TargetTouches()
{
if (!mTargetTouches) {
WidgetTouchEvent::AutoTouchArray targetTouches;
WidgetTouchEvent* touchEvent = mEvent->AsTouchEvent();
const WidgetTouchEvent::TouchArray& touches = touchEvent->touches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
// for touchend/cancel events, don't append to the target list if this is a
// touch that is ending
if ((mEvent->message != NS_TOUCH_END &&
mEvent->message != NS_TOUCH_CANCEL) || !touches[i]->mChanged) {
if (touches[i]->mTarget == mEvent->originalTarget) {
targetTouches.AppendElement(touches[i]);
}
}
}
mTargetTouches = new TouchList(ToSupports(this), targetTouches);
}
return mTargetTouches;
}
TouchList*
TouchEvent::ChangedTouches()
{
if (!mChangedTouches) {
WidgetTouchEvent::AutoTouchArray changedTouches;
WidgetTouchEvent* touchEvent = mEvent->AsTouchEvent();
const WidgetTouchEvent::TouchArray& touches = touchEvent->touches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
if (touches[i]->mChanged) {
changedTouches.AppendElement(touches[i]);
}
}
mChangedTouches = new TouchList(ToSupports(this), changedTouches);
}
return mChangedTouches;
}
// static
bool
TouchEvent::PrefEnabled(JSContext* aCx, JSObject* aGlobal)
{
bool prefValue = false;
int32_t flag = 0;
if (NS_SUCCEEDED(Preferences::GetInt("dom.w3c_touch_events.enabled",
&flag))) {
if (flag == 2) {
#ifdef XP_WIN
static bool sDidCheckTouchDeviceSupport = false;
static bool sIsTouchDeviceSupportPresent = false;
// On Windows we auto-detect based on device support.
if (!sDidCheckTouchDeviceSupport) {
sDidCheckTouchDeviceSupport = true;
sIsTouchDeviceSupportPresent = widget::IsTouchDeviceSupportPresent();
}
prefValue = sIsTouchDeviceSupportPresent;
#else
NS_WARNING("dom.w3c_touch_events.enabled=2 not implemented!");
prefValue = false;
#endif
} else {
prefValue = !!flag;
}
}
if (prefValue) {
nsContentUtils::InitializeTouchEventTable();
}
return prefValue;
}
bool
TouchEvent::AltKey()
{
return mEvent->AsTouchEvent()->IsAlt();
}
bool
TouchEvent::MetaKey()
{
return mEvent->AsTouchEvent()->IsMeta();
}
bool
TouchEvent::CtrlKey()
{
return mEvent->AsTouchEvent()->IsControl();
}
bool
TouchEvent::ShiftKey()
{
return mEvent->AsTouchEvent()->IsShift();
}
} // namespace dom
} // namespace mozilla
using namespace mozilla;
using namespace mozilla::dom;
nsresult
NS_NewDOMTouchEvent(nsIDOMEvent** aInstancePtrResult,
EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetTouchEvent* aEvent)
{
TouchEvent* it = new TouchEvent(aOwner, aPresContext, aEvent);
NS_ADDREF(it);
*aInstancePtrResult = static_cast<Event*>(it);
return NS_OK;
}