зеркало из https://github.com/mozilla/gecko-dev.git
559 строки
19 KiB
C++
559 строки
19 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 "PointerEventHandler.h"
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#include "nsIFrame.h"
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#include "PointerEvent.h"
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#include "mozilla/PresShell.h"
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namespace mozilla {
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using namespace dom;
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static bool sPointerEventEnabled = true;
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static bool sPointerEventImplicitCapture = false;
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class PointerInfo final
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{
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public:
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uint16_t mPointerType;
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bool mActiveState;
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bool mPrimaryState;
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bool mPreventMouseEventByContent;
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explicit PointerInfo(bool aActiveState, uint16_t aPointerType,
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bool aPrimaryState)
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: mPointerType(aPointerType)
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, mActiveState(aActiveState)
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, mPrimaryState(aPrimaryState)
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, mPreventMouseEventByContent(false)
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{
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}
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};
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// Keeps a map between pointerId and element that currently capturing pointer
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// with such pointerId. If pointerId is absent in this map then nobody is
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// capturing it. Additionally keep information about pending capturing content.
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static nsClassHashtable<nsUint32HashKey,
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PointerCaptureInfo>* sPointerCaptureList;
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// Keeps information about pointers such as pointerId, activeState, pointerType,
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// primaryState
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static nsClassHashtable<nsUint32HashKey, PointerInfo>* sActivePointersIds;
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/* static */ void
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PointerEventHandler::Initialize()
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{
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static bool initialized = false;
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if (initialized) {
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return;
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}
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initialized = true;
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Preferences::AddBoolVarCache(&sPointerEventEnabled,
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"dom.w3c_pointer_events.enabled", true);
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Preferences::AddBoolVarCache(&sPointerEventImplicitCapture,
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"dom.w3c_pointer_events.implicit_capture", true);
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}
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/* static */ void
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PointerEventHandler::InitializeStatics()
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{
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MOZ_ASSERT(!sPointerCaptureList, "InitializeStatics called multiple times!");
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sPointerCaptureList =
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new nsClassHashtable<nsUint32HashKey, PointerCaptureInfo>;
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sActivePointersIds = new nsClassHashtable<nsUint32HashKey, PointerInfo>;
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}
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/* static */ void
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PointerEventHandler::ReleaseStatics()
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{
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MOZ_ASSERT(sPointerCaptureList, "ReleaseStatics called without Initialize!");
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delete sPointerCaptureList;
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sPointerCaptureList = nullptr;
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delete sActivePointersIds;
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sActivePointersIds = nullptr;
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}
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/* static */ bool
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PointerEventHandler::IsPointerEventEnabled()
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{
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return sPointerEventEnabled;
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}
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/* static */ bool
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PointerEventHandler::IsPointerEventImplicitCaptureForTouchEnabled()
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{
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return sPointerEventEnabled && sPointerEventImplicitCapture;
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}
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/* static */ void
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PointerEventHandler::UpdateActivePointerState(WidgetMouseEvent* aEvent)
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{
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if (!IsPointerEventEnabled() || !aEvent) {
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return;
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}
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switch (aEvent->mMessage) {
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case eMouseEnterIntoWidget:
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// In this case we have to know information about available mouse pointers
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sActivePointersIds->Put(aEvent->pointerId,
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new PointerInfo(false, aEvent->inputSource, true));
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break;
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case ePointerDown:
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// In this case we switch pointer to active state
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if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
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sActivePointersIds->Put(pointerEvent->pointerId,
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new PointerInfo(true, pointerEvent->inputSource,
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pointerEvent->mIsPrimary));
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}
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break;
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case ePointerCancel:
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// pointercancel means a pointer is unlikely to continue to produce pointer
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// events. In that case, we should turn off active state or remove the
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// pointer from active pointers.
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case ePointerUp:
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// In this case we remove information about pointer or turn off active state
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if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
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if(pointerEvent->inputSource != nsIDOMMouseEvent::MOZ_SOURCE_TOUCH) {
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sActivePointersIds->Put(pointerEvent->pointerId,
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new PointerInfo(false,
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pointerEvent->inputSource,
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pointerEvent->mIsPrimary));
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} else {
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sActivePointersIds->Remove(pointerEvent->pointerId);
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}
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}
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break;
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case eMouseExitFromWidget:
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// In this case we have to remove information about disappeared mouse
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// pointers
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sActivePointersIds->Remove(aEvent->pointerId);
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break;
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default:
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break;
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}
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}
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/* static */ void
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PointerEventHandler::SetPointerCaptureById(uint32_t aPointerId,
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nsIContent* aContent)
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{
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MOZ_ASSERT(aContent);
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if (nsIDOMMouseEvent::MOZ_SOURCE_MOUSE == GetPointerType(aPointerId)) {
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nsIPresShell::SetCapturingContent(aContent, CAPTURE_PREVENTDRAG);
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}
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PointerCaptureInfo* pointerCaptureInfo = GetPointerCaptureInfo(aPointerId);
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if (pointerCaptureInfo) {
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pointerCaptureInfo->mPendingContent = aContent;
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} else {
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sPointerCaptureList->Put(aPointerId, new PointerCaptureInfo(aContent));
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}
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}
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/* static */ PointerCaptureInfo*
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PointerEventHandler::GetPointerCaptureInfo(uint32_t aPointerId)
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{
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PointerCaptureInfo* pointerCaptureInfo = nullptr;
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sPointerCaptureList->Get(aPointerId, &pointerCaptureInfo);
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return pointerCaptureInfo;
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}
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/* static */ void
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PointerEventHandler::ReleasePointerCaptureById(uint32_t aPointerId)
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{
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PointerCaptureInfo* pointerCaptureInfo = GetPointerCaptureInfo(aPointerId);
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if (pointerCaptureInfo && pointerCaptureInfo->mPendingContent) {
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if (nsIDOMMouseEvent::MOZ_SOURCE_MOUSE == GetPointerType(aPointerId)) {
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nsIPresShell::SetCapturingContent(nullptr, CAPTURE_PREVENTDRAG);
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}
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pointerCaptureInfo->mPendingContent = nullptr;
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}
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}
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/* static */ void
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PointerEventHandler::ReleaseAllPointerCapture()
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{
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for (auto iter = sPointerCaptureList->Iter(); !iter.Done(); iter.Next()) {
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PointerCaptureInfo* data = iter.UserData();
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if (data && data->mPendingContent) {
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ReleasePointerCaptureById(iter.Key());
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}
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}
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}
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/* static */ bool
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PointerEventHandler::GetPointerInfo(uint32_t aPointerId, bool& aActiveState)
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{
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PointerInfo* pointerInfo = nullptr;
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if (sActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
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aActiveState = pointerInfo->mActiveState;
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return true;
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}
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return false;
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}
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/* static */ void
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PointerEventHandler::CheckPointerCaptureState(WidgetPointerEvent* aEvent)
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{
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// Handle pending pointer capture before any pointer events except
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// gotpointercapture / lostpointercapture.
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if (!aEvent) {
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return;
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}
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MOZ_ASSERT(IsPointerEventEnabled());
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MOZ_ASSERT(aEvent->mClass == ePointerEventClass);
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PointerCaptureInfo* captureInfo = GetPointerCaptureInfo(aEvent->pointerId);
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if (captureInfo &&
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captureInfo->mPendingContent != captureInfo->mOverrideContent) {
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// cache captureInfo->mPendingContent since it may be changed in the pointer
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// event listener
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nsIContent* pendingContent = captureInfo->mPendingContent.get();
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if (captureInfo->mOverrideContent) {
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DispatchGotOrLostPointerCaptureEvent(/* aIsGotCapture */ false, aEvent,
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captureInfo->mOverrideContent);
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}
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if (pendingContent) {
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DispatchGotOrLostPointerCaptureEvent(/* aIsGotCapture */ true, aEvent,
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pendingContent);
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}
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captureInfo->mOverrideContent = pendingContent;
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if (captureInfo->Empty()) {
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sPointerCaptureList->Remove(aEvent->pointerId);
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}
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}
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}
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/* static */ void
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PointerEventHandler::ImplicitlyCapturePointer(nsIFrame* aFrame,
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WidgetEvent* aEvent)
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{
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MOZ_ASSERT(aEvent->mMessage == ePointerDown);
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if (!aFrame || !IsPointerEventEnabled() ||
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!IsPointerEventImplicitCaptureForTouchEnabled()) {
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return;
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}
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WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent();
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NS_WARNING_ASSERTION(pointerEvent,
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"Call ImplicitlyCapturePointer with non-pointer event");
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if (pointerEvent->inputSource != nsIDOMMouseEvent::MOZ_SOURCE_TOUCH) {
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// We only implicitly capture the pointer for touch device.
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return;
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}
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nsCOMPtr<nsIContent> target;
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aFrame->GetContentForEvent(aEvent, getter_AddRefs(target));
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while (target && !target->IsElement()) {
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target = target->GetParent();
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}
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if (NS_WARN_IF(!target)) {
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return;
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}
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SetPointerCaptureById(pointerEvent->pointerId, target);
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}
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/* static */ void
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PointerEventHandler::ImplicitlyReleasePointerCapture(WidgetEvent* aEvent)
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{
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MOZ_ASSERT(aEvent);
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if (aEvent->mMessage != ePointerUp && aEvent->mMessage != ePointerCancel) {
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return;
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}
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WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent();
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ReleasePointerCaptureById(pointerEvent->pointerId);
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CheckPointerCaptureState(pointerEvent);
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}
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/* static */ nsIContent*
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PointerEventHandler::GetPointerCapturingContent(uint32_t aPointerId)
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{
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PointerCaptureInfo* pointerCaptureInfo = GetPointerCaptureInfo(aPointerId);
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if (pointerCaptureInfo) {
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return pointerCaptureInfo->mOverrideContent;
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}
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return nullptr;
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}
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/* static */ nsIFrame*
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PointerEventHandler::GetPointerCapturingFrame(nsIFrame* aFrameUnderCursor,
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WidgetGUIEvent* aEvent)
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{
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if (!IsPointerEventEnabled() || (aEvent->mClass != ePointerEventClass &&
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aEvent->mClass != eMouseEventClass) ||
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aEvent->mMessage == ePointerDown || aEvent->mMessage == eMouseDown) {
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// Pointer capture should only be applied to all pointer events and mouse
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// events except ePointerDown and eMouseDown;
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return aFrameUnderCursor;
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}
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WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
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if (!mouseEvent) {
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return aFrameUnderCursor;
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}
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// Find the content which captures the pointer.
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nsIContent* capturingContent =
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GetPointerCapturingContent(mouseEvent->pointerId);
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if (!capturingContent) {
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return aFrameUnderCursor;
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}
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// Return the content's primary frame as the target frame.
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nsIFrame* capturingFrame = capturingContent->GetPrimaryFrame();
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return capturingFrame ? capturingFrame : aFrameUnderCursor;
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}
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/* static */ void
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PointerEventHandler::ReleaseIfCaptureByDescendant(nsIContent* aContent)
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{
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// We should check that aChild does not contain pointer capturing elements.
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// If it does we should release the pointer capture for the elements.
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for (auto iter = sPointerCaptureList->Iter(); !iter.Done(); iter.Next()) {
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PointerCaptureInfo* data = iter.UserData();
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if (data && data->mPendingContent &&
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nsContentUtils::ContentIsDescendantOf(data->mPendingContent,
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aContent)) {
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ReleasePointerCaptureById(iter.Key());
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}
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}
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}
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/* static */ void
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PointerEventHandler::PreHandlePointerEventsPreventDefault(
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WidgetPointerEvent* aPointerEvent,
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WidgetGUIEvent* aMouseOrTouchEvent)
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{
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if (!aPointerEvent->mIsPrimary || aPointerEvent->mMessage == ePointerDown) {
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return;
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}
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PointerInfo* pointerInfo = nullptr;
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if (!sActivePointersIds->Get(aPointerEvent->pointerId, &pointerInfo) ||
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!pointerInfo) {
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// The PointerInfo for active pointer should be added for normal cases. But
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// in some cases, we may receive mouse events before adding PointerInfo in
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// sActivePointersIds. (e.g. receive mousemove before eMouseEnterIntoWidget
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// or change preference 'dom.w3c_pointer_events.enabled' from off to on).
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// In these cases, we could ignore them because they are not the events
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// between a DefaultPrevented pointerdown and the corresponding pointerup.
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return;
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}
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if (!pointerInfo->mPreventMouseEventByContent) {
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return;
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}
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aMouseOrTouchEvent->PreventDefault(false);
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if (aPointerEvent->mMessage == ePointerUp) {
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pointerInfo->mPreventMouseEventByContent = false;
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}
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}
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/* static */ void
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PointerEventHandler::PostHandlePointerEventsPreventDefault(
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WidgetPointerEvent* aPointerEvent,
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WidgetGUIEvent* aMouseOrTouchEvent)
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{
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if (!aPointerEvent->mIsPrimary || aPointerEvent->mMessage != ePointerDown ||
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!aPointerEvent->DefaultPreventedByContent()) {
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return;
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}
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PointerInfo* pointerInfo = nullptr;
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if (!sActivePointersIds->Get(aPointerEvent->pointerId, &pointerInfo) ||
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!pointerInfo) {
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// We already added the PointerInfo for active pointer when
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// PresShell::HandleEvent handling pointerdown event.
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#ifdef DEBUG
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MOZ_CRASH("Got ePointerDown w/o active pointer info!!");
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#endif // #ifdef DEBUG
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return;
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}
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// PreventDefault only applied for active pointers.
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if (!pointerInfo->mActiveState) {
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return;
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}
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aMouseOrTouchEvent->PreventDefault(false);
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pointerInfo->mPreventMouseEventByContent = true;
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}
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/* static */ void
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PointerEventHandler::DispatchPointerFromMouseOrTouch(
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PresShell* aShell,
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nsIFrame* aFrame,
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WidgetGUIEvent* aEvent,
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bool aDontRetargetEvents,
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nsEventStatus* aStatus,
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nsIContent** aTargetContent)
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{
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MOZ_ASSERT(IsPointerEventEnabled());
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MOZ_ASSERT(aFrame);
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MOZ_ASSERT(aEvent);
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EventMessage pointerMessage = eVoidEvent;
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if (aEvent->mClass == eMouseEventClass) {
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WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
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// 1. If it is not mouse then it is likely will come as touch event
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// 2. We don't synthesize pointer events for those events that are not
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// dispatched to DOM.
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if (!mouseEvent->convertToPointer ||
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!aEvent->IsAllowedToDispatchDOMEvent()) {
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return;
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}
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int16_t button = mouseEvent->button;
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switch (mouseEvent->mMessage) {
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case eMouseMove:
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button = WidgetMouseEvent::eNoButton;
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pointerMessage = ePointerMove;
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break;
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case eMouseUp:
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pointerMessage = mouseEvent->buttons ? ePointerMove : ePointerUp;
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break;
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case eMouseDown:
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pointerMessage =
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mouseEvent->buttons & ~nsContentUtils::GetButtonsFlagForButton(button) ?
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ePointerMove : ePointerDown;
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break;
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default:
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return;
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}
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WidgetPointerEvent event(*mouseEvent);
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event.pointerId = mouseEvent->pointerId;
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event.inputSource = mouseEvent->inputSource;
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event.mMessage = pointerMessage;
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event.button = button;
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event.buttons = mouseEvent->buttons;
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event.pressure = event.buttons ?
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mouseEvent->pressure ? mouseEvent->pressure : 0.5f :
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0.0f;
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event.convertToPointer = mouseEvent->convertToPointer = false;
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PreHandlePointerEventsPreventDefault(&event, aEvent);
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RefPtr<PresShell> shell(aShell);
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shell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus,
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aTargetContent);
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PostHandlePointerEventsPreventDefault(&event, aEvent);
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} else if (aEvent->mClass == eTouchEventClass) {
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WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
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int16_t button = WidgetMouseEvent::eLeftButton;
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int16_t buttons = WidgetMouseEvent::eLeftButtonFlag;
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// loop over all touches and dispatch pointer events on each touch
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// copy the event
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switch (touchEvent->mMessage) {
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case eTouchMove:
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pointerMessage = ePointerMove;
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button = WidgetMouseEvent::eNoButton;
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break;
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case eTouchEnd:
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pointerMessage = ePointerUp;
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buttons = WidgetMouseEvent::eNoButtonFlag;
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break;
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case eTouchStart:
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pointerMessage = ePointerDown;
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break;
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case eTouchCancel:
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case eTouchPointerCancel:
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pointerMessage = ePointerCancel;
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break;
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default:
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return;
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}
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RefPtr<PresShell> shell(aShell);
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for (uint32_t i = 0; i < touchEvent->mTouches.Length(); ++i) {
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Touch* touch = touchEvent->mTouches[i];
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if (!TouchManager::ShouldConvertTouchToPointer(touch, touchEvent)) {
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continue;
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}
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WidgetPointerEvent event(touchEvent->IsTrusted(), pointerMessage,
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touchEvent->mWidget);
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event.mIsPrimary = i == 0;
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event.pointerId = touch->Identifier();
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event.mRefPoint = touch->mRefPoint;
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event.mModifiers = touchEvent->mModifiers;
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event.mWidth = touch->RadiusX(CallerType::System);
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event.mHeight = touch->RadiusY(CallerType::System);
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event.tiltX = touch->tiltX;
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event.tiltY = touch->tiltY;
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event.mTime = touchEvent->mTime;
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event.mTimeStamp = touchEvent->mTimeStamp;
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event.mFlags = touchEvent->mFlags;
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event.button = button;
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event.buttons = buttons;
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event.inputSource = nsIDOMMouseEvent::MOZ_SOURCE_TOUCH;
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event.convertToPointer = touch->convertToPointer = false;
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PreHandlePointerEventsPreventDefault(&event, aEvent);
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shell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus,
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aTargetContent);
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PostHandlePointerEventsPreventDefault(&event, aEvent);
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}
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}
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}
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/* static */ uint16_t
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PointerEventHandler::GetPointerType(uint32_t aPointerId)
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{
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PointerInfo* pointerInfo = nullptr;
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if (sActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
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return pointerInfo->mPointerType;
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}
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return nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN;
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}
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/* static */ bool
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PointerEventHandler::GetPointerPrimaryState(uint32_t aPointerId)
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{
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PointerInfo* pointerInfo = nullptr;
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if (sActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
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return pointerInfo->mPrimaryState;
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}
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return false;
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}
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/* static */ void
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PointerEventHandler::DispatchGotOrLostPointerCaptureEvent(
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bool aIsGotCapture,
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const WidgetPointerEvent* aPointerEvent,
|
|
nsIContent* aCaptureTarget)
|
|
{
|
|
nsIDocument* targetDoc = aCaptureTarget->OwnerDoc();
|
|
nsCOMPtr<nsIPresShell> shell = targetDoc->GetShell();
|
|
if (NS_WARN_IF(!shell)) {
|
|
return;
|
|
}
|
|
|
|
if (!aIsGotCapture && !aCaptureTarget->IsInUncomposedDoc()) {
|
|
// If the capturing element was removed from the DOM tree, fire
|
|
// ePointerLostCapture at the document.
|
|
PointerEventInit init;
|
|
init.mPointerId = aPointerEvent->pointerId;
|
|
init.mBubbles = true;
|
|
init.mComposed = true;
|
|
ConvertPointerTypeToString(aPointerEvent->inputSource, init.mPointerType);
|
|
init.mIsPrimary = aPointerEvent->mIsPrimary;
|
|
RefPtr<PointerEvent> event;
|
|
event = PointerEvent::Constructor(aCaptureTarget,
|
|
NS_LITERAL_STRING("lostpointercapture"),
|
|
init);
|
|
bool dummy;
|
|
targetDoc->DispatchEvent(event->InternalDOMEvent(), &dummy);
|
|
return;
|
|
}
|
|
nsEventStatus status = nsEventStatus_eIgnore;
|
|
WidgetPointerEvent localEvent(aPointerEvent->IsTrusted(),
|
|
aIsGotCapture ? ePointerGotCapture :
|
|
ePointerLostCapture,
|
|
aPointerEvent->mWidget);
|
|
|
|
localEvent.AssignPointerEventData(*aPointerEvent, true);
|
|
DebugOnly<nsresult> rv = shell->HandleEventWithTarget(
|
|
&localEvent,
|
|
aCaptureTarget->GetPrimaryFrame(),
|
|
aCaptureTarget, &status);
|
|
|
|
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
|
|
"DispatchGotOrLostPointerCaptureEvent failed");
|
|
}
|
|
|
|
} // namespace mozilla
|