зеркало из https://github.com/mozilla/gecko-dev.git
352 строки
12 KiB
C++
352 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/Navigator.h"
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#include "mozilla/dom/TouchEvent.h"
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#include "mozilla/dom/Touch.h"
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#include "mozilla/dom/TouchListBinding.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/StaticPrefs.h"
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#include "mozilla/TouchEvents.h"
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#include "nsContentUtils.h"
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#include "nsIDocShell.h"
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#include "mozilla/WidgetUtils.h"
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namespace mozilla {
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namespace dom {
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/******************************************************************************
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* TouchList
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*****************************************************************************/
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TouchList)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(TouchList, mParent, mPoints)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(TouchList)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(TouchList)
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JSObject* TouchList::WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return TouchList_Binding::Wrap(aCx, this, aGivenProto);
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}
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// static
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bool TouchList::PrefEnabled(JSContext* aCx, JSObject* aGlobal) {
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return TouchEvent::PrefEnabled(aCx, aGlobal);
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}
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/******************************************************************************
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* TouchEvent
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*****************************************************************************/
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TouchEvent::TouchEvent(EventTarget* aOwner, nsPresContext* aPresContext,
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WidgetTouchEvent* aEvent)
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: UIEvent(
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aOwner, aPresContext,
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aEvent ? aEvent : new WidgetTouchEvent(false, eVoidEvent, nullptr)) {
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if (aEvent) {
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mEventIsInternal = false;
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for (uint32_t i = 0; i < aEvent->mTouches.Length(); ++i) {
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Touch* touch = aEvent->mTouches[i];
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touch->InitializePoints(mPresContext, aEvent);
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}
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} else {
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mEventIsInternal = true;
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mEvent->mTime = PR_Now();
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}
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}
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NS_IMPL_CYCLE_COLLECTION_INHERITED(TouchEvent, UIEvent,
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mEvent->AsTouchEvent()->mTouches, mTouches,
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mTargetTouches, mChangedTouches)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TouchEvent)
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NS_INTERFACE_MAP_END_INHERITING(UIEvent)
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NS_IMPL_ADDREF_INHERITED(TouchEvent, UIEvent)
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NS_IMPL_RELEASE_INHERITED(TouchEvent, UIEvent)
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void TouchEvent::InitTouchEvent(const nsAString& aType, bool aCanBubble,
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bool aCancelable, nsGlobalWindowInner* aView,
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int32_t aDetail, bool aCtrlKey, bool aAltKey,
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bool aShiftKey, bool aMetaKey,
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TouchList* aTouches, TouchList* aTargetTouches,
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TouchList* aChangedTouches) {
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NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
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UIEvent::InitUIEvent(aType, aCanBubble, aCancelable, aView, aDetail);
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mEvent->AsInputEvent()->InitBasicModifiers(aCtrlKey, aAltKey, aShiftKey,
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aMetaKey);
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mEvent->AsTouchEvent()->mTouches.Clear();
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// To support touch.target retargeting also when the event is
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// created by JS, we need to copy Touch objects to the widget event.
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// In order to not affect targetTouches, we don't check duplicates in that
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// list.
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mTargetTouches = aTargetTouches;
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AssignTouchesToWidgetEvent(mTargetTouches, false);
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mTouches = aTouches;
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AssignTouchesToWidgetEvent(mTouches, true);
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mChangedTouches = aChangedTouches;
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AssignTouchesToWidgetEvent(mChangedTouches, true);
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}
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void TouchEvent::AssignTouchesToWidgetEvent(TouchList* aList,
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bool aCheckDuplicates) {
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if (!aList) {
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return;
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}
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WidgetTouchEvent* widgetTouchEvent = mEvent->AsTouchEvent();
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for (uint32_t i = 0; i < aList->Length(); ++i) {
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Touch* touch = aList->Item(i);
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if (touch &&
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(!aCheckDuplicates || !widgetTouchEvent->mTouches.Contains(touch))) {
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widgetTouchEvent->mTouches.AppendElement(touch);
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}
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}
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}
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TouchList* TouchEvent::Touches() {
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if (!mTouches) {
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WidgetTouchEvent* touchEvent = mEvent->AsTouchEvent();
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if (mEvent->mMessage == eTouchEnd || mEvent->mMessage == eTouchCancel) {
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// for touchend events, remove any changed touches from mTouches
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WidgetTouchEvent::AutoTouchArray unchangedTouches;
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const WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
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for (uint32_t i = 0; i < touches.Length(); ++i) {
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if (!touches[i]->mChanged) {
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unchangedTouches.AppendElement(touches[i]);
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}
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}
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mTouches = new TouchList(ToSupports(this), unchangedTouches);
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} else {
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mTouches = new TouchList(ToSupports(this), touchEvent->mTouches);
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}
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}
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return mTouches;
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}
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TouchList* TouchEvent::TargetTouches() {
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if (!mTargetTouches || !mTargetTouches->Length()) {
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WidgetTouchEvent* touchEvent = mEvent->AsTouchEvent();
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if (!mTargetTouches) {
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mTargetTouches = new TouchList(ToSupports(this));
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}
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const WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
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for (uint32_t i = 0; i < touches.Length(); ++i) {
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// for touchend/cancel events, don't append to the target list if this is
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// a touch that is ending
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if ((mEvent->mMessage != eTouchEnd && mEvent->mMessage != eTouchCancel) ||
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!touches[i]->mChanged) {
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bool equalTarget = touches[i]->mTarget == mEvent->mTarget;
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if (!equalTarget) {
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// Need to still check if we're inside native anonymous content
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// and the non-NAC target would be the same.
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nsCOMPtr<nsIContent> touchTarget =
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do_QueryInterface(touches[i]->mTarget);
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nsCOMPtr<nsIContent> eventTarget = do_QueryInterface(mEvent->mTarget);
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equalTarget = touchTarget && eventTarget &&
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touchTarget->FindFirstNonChromeOnlyAccessContent() ==
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eventTarget->FindFirstNonChromeOnlyAccessContent();
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}
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if (equalTarget) {
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mTargetTouches->Append(touches[i]);
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}
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}
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}
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}
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return mTargetTouches;
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}
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TouchList* TouchEvent::ChangedTouches() {
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if (!mChangedTouches) {
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WidgetTouchEvent::AutoTouchArray changedTouches;
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WidgetTouchEvent* touchEvent = mEvent->AsTouchEvent();
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const WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
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for (uint32_t i = 0; i < touches.Length(); ++i) {
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if (touches[i]->mChanged) {
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changedTouches.AppendElement(touches[i]);
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}
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}
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mChangedTouches = new TouchList(ToSupports(this), changedTouches);
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}
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return mChangedTouches;
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}
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// static
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bool TouchEvent::PrefEnabled(JSContext* aCx, JSObject* aGlobal) {
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nsIDocShell* docShell = nullptr;
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if (aGlobal) {
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nsGlobalWindowInner* win = xpc::WindowOrNull(aGlobal);
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if (win) {
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docShell = win->GetDocShell();
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}
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}
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return PrefEnabled(docShell);
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}
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// static
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bool TouchEvent::PlatformSupportsTouch() {
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#if defined(MOZ_WIDGET_ANDROID)
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// Touch support is always enabled on android.
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return true;
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#elif defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
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static bool sDidCheckTouchDeviceSupport = false;
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static bool sIsTouchDeviceSupportPresent = false;
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// On Windows and GTK3 we auto-detect based on device support.
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if (!sDidCheckTouchDeviceSupport) {
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sDidCheckTouchDeviceSupport = true;
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sIsTouchDeviceSupportPresent = WidgetUtils::IsTouchDeviceSupportPresent();
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// But touch events are only actually supported if APZ is enabled. If
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// APZ is disabled globally, we can check that once and incorporate that
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// into the cached state. If APZ is enabled, we need to further check
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// based on the widget, which we do below (and don't cache that result).
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sIsTouchDeviceSupportPresent &= gfxPlatform::AsyncPanZoomEnabled();
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}
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return sIsTouchDeviceSupportPresent;
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#else
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return false;
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#endif
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}
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// static
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bool TouchEvent::PrefEnabled(nsIDocShell* aDocShell) {
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static bool sPrefCached = false;
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static int32_t sPrefCacheValue = 0;
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auto touchEventsOverride = nsIDocShell::TOUCHEVENTS_OVERRIDE_NONE;
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if (aDocShell) {
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touchEventsOverride = aDocShell->GetTouchEventsOverride();
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}
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if (!sPrefCached) {
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sPrefCached = true;
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Preferences::AddIntVarCache(&sPrefCacheValue,
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"dom.w3c_touch_events.enabled");
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}
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bool enabled = false;
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if (touchEventsOverride == nsIDocShell::TOUCHEVENTS_OVERRIDE_ENABLED) {
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enabled = true;
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} else if (touchEventsOverride ==
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nsIDocShell::TOUCHEVENTS_OVERRIDE_DISABLED) {
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enabled = false;
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} else {
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if (sPrefCacheValue == 2) {
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enabled = PlatformSupportsTouch();
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static bool firstTime = true;
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// The touch screen data seems to be inaccurate in the parent process,
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// and we really need the crash annotation in child processes.
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if (firstTime && !XRE_IsParentProcess()) {
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CrashReporter::AnnotateCrashReport(
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CrashReporter::Annotation::HasDeviceTouchScreen, enabled);
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firstTime = false;
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}
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#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
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if (enabled && aDocShell) {
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// APZ might be disabled on this particular widget, in which case
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// TouchEvent support will also be disabled. Try to detect that.
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RefPtr<nsPresContext> pc = aDocShell->GetPresContext();
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if (pc && pc->GetRootWidget()) {
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enabled &= pc->GetRootWidget()->AsyncPanZoomEnabled();
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}
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}
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#endif
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} else {
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enabled = !!sPrefCacheValue;
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}
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}
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if (enabled) {
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nsContentUtils::InitializeTouchEventTable();
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}
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return enabled;
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}
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// static
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bool TouchEvent::LegacyAPIEnabled(JSContext* aCx, JSObject* aGlobal) {
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nsIPrincipal* principal = nsContentUtils::SubjectPrincipal(aCx);
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bool isSystem = principal && nsContentUtils::IsSystemPrincipal(principal);
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nsIDocShell* docShell = nullptr;
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if (aGlobal) {
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nsGlobalWindowInner* win = xpc::WindowOrNull(aGlobal);
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if (win) {
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docShell = win->GetDocShell();
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}
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}
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return LegacyAPIEnabled(docShell, isSystem);
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}
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// static
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bool TouchEvent::LegacyAPIEnabled(nsIDocShell* aDocShell,
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bool aCallerIsSystem) {
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return (aCallerIsSystem ||
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StaticPrefs::dom_w3c_touch_events_legacy_apis_enabled() ||
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(aDocShell && aDocShell->GetTouchEventsOverride() ==
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nsIDocShell::TOUCHEVENTS_OVERRIDE_ENABLED)) &&
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PrefEnabled(aDocShell);
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}
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// static
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already_AddRefed<TouchEvent> TouchEvent::Constructor(
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const GlobalObject& aGlobal, const nsAString& aType,
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const TouchEventInit& aParam, ErrorResult& aRv) {
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nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
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RefPtr<TouchEvent> e = new TouchEvent(t, nullptr, nullptr);
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bool trusted = e->Init(t);
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RefPtr<TouchList> touches = e->CopyTouches(aParam.mTouches);
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RefPtr<TouchList> targetTouches = e->CopyTouches(aParam.mTargetTouches);
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RefPtr<TouchList> changedTouches = e->CopyTouches(aParam.mChangedTouches);
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e->InitTouchEvent(aType, aParam.mBubbles, aParam.mCancelable, aParam.mView,
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aParam.mDetail, aParam.mCtrlKey, aParam.mAltKey,
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aParam.mShiftKey, aParam.mMetaKey, touches, targetTouches,
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changedTouches);
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e->SetTrusted(trusted);
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e->SetComposed(aParam.mComposed);
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return e.forget();
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}
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already_AddRefed<TouchList> TouchEvent::CopyTouches(
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const Sequence<OwningNonNull<Touch>>& aTouches) {
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RefPtr<TouchList> list = new TouchList(GetParentObject());
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size_t len = aTouches.Length();
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for (size_t i = 0; i < len; ++i) {
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list->Append(aTouches[i]);
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}
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return list.forget();
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}
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bool TouchEvent::AltKey() { return mEvent->AsTouchEvent()->IsAlt(); }
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bool TouchEvent::MetaKey() { return mEvent->AsTouchEvent()->IsMeta(); }
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bool TouchEvent::CtrlKey() { return mEvent->AsTouchEvent()->IsControl(); }
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bool TouchEvent::ShiftKey() { return mEvent->AsTouchEvent()->IsShift(); }
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} // namespace dom
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} // namespace mozilla
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using namespace mozilla;
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using namespace mozilla::dom;
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already_AddRefed<TouchEvent> NS_NewDOMTouchEvent(EventTarget* aOwner,
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nsPresContext* aPresContext,
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WidgetTouchEvent* aEvent) {
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RefPtr<TouchEvent> it = new TouchEvent(aOwner, aPresContext, aEvent);
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return it.forget();
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}
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