mirror of
https://github.com/mozilla/gecko-dev.git
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335 lines
10 KiB
C++
335 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=2 sw=2 et tw=78:
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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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*/
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#include "TouchManager.h"
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#include "mozilla/dom/EventTarget.h"
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#include "mozilla/PresShell.h"
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#include "nsIFrame.h"
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#include "nsView.h"
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using namespace mozilla::dom;
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namespace mozilla {
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nsDataHashtable<nsUint32HashKey, TouchManager::TouchInfo>* TouchManager::sCaptureTouchList;
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/*static*/ void
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TouchManager::InitializeStatics()
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{
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NS_ASSERTION(!sCaptureTouchList, "InitializeStatics called multiple times!");
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sCaptureTouchList = new nsDataHashtable<nsUint32HashKey, TouchManager::TouchInfo>;
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}
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/*static*/ void
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TouchManager::ReleaseStatics()
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{
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NS_ASSERTION(sCaptureTouchList, "ReleaseStatics called without Initialize!");
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delete sCaptureTouchList;
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sCaptureTouchList = nullptr;
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}
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void
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TouchManager::Init(PresShell* aPresShell, nsIDocument* aDocument)
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{
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mPresShell = aPresShell;
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mDocument = aDocument;
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}
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void
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TouchManager::Destroy()
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{
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EvictTouches();
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mDocument = nullptr;
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mPresShell = nullptr;
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}
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static nsIContent*
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GetNonAnonymousAncestor(EventTarget* aTarget)
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{
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nsCOMPtr<nsIContent> content(do_QueryInterface(aTarget));
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if (content && content->IsInNativeAnonymousSubtree()) {
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content = content->FindFirstNonChromeOnlyAccessContent();
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}
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return content;
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}
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/*static*/ void
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TouchManager::EvictTouchPoint(RefPtr<Touch>& aTouch,
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nsIDocument* aLimitToDocument)
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{
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nsCOMPtr<nsINode> node(do_QueryInterface(aTouch->mTarget));
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if (node) {
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nsIDocument* doc = node->GetUncomposedDoc();
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if (doc && (!aLimitToDocument || aLimitToDocument == doc)) {
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nsIPresShell* presShell = doc->GetShell();
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if (presShell) {
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nsIFrame* frame = presShell->GetRootFrame();
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if (frame) {
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nsPoint pt(aTouch->mRefPoint.x, aTouch->mRefPoint.y);
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nsCOMPtr<nsIWidget> widget = frame->GetView()->GetNearestWidget(&pt);
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if (widget) {
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WidgetTouchEvent event(true, eTouchEnd, widget);
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event.mTime = PR_IntervalNow();
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event.mTouches.AppendElement(aTouch);
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nsEventStatus status;
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widget->DispatchEvent(&event, status);
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}
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}
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}
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}
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}
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if (!node || !aLimitToDocument || node->OwnerDoc() == aLimitToDocument) {
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sCaptureTouchList->Remove(aTouch->Identifier());
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}
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}
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/*static*/ void
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TouchManager::AppendToTouchList(WidgetTouchEvent::TouchArray* aTouchList)
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{
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for (auto iter = sCaptureTouchList->Iter();
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!iter.Done();
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iter.Next()) {
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RefPtr<Touch>& touch = iter.Data().mTouch;
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touch->mChanged = false;
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aTouchList->AppendElement(touch);
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}
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}
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void
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TouchManager::EvictTouches()
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{
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WidgetTouchEvent::AutoTouchArray touches;
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AppendToTouchList(&touches);
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for (uint32_t i = 0; i < touches.Length(); ++i) {
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EvictTouchPoint(touches[i], mDocument);
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}
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}
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bool
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TouchManager::PreHandleEvent(WidgetEvent* aEvent,
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nsEventStatus* aStatus,
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bool& aTouchIsNew,
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bool& aIsHandlingUserInput,
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nsCOMPtr<nsIContent>& aCurrentEventContent)
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{
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switch (aEvent->mMessage) {
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case eTouchStart: {
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aIsHandlingUserInput = true;
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WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
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// if there is only one touch in this touchstart event, assume that it is
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// the start of a new touch session and evict any old touches in the
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// queue
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if (touchEvent->mTouches.Length() == 1) {
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WidgetTouchEvent::AutoTouchArray touches;
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AppendToTouchList(&touches);
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for (uint32_t i = 0; i < touches.Length(); ++i) {
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EvictTouchPoint(touches[i]);
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}
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}
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// Add any new touches to the queue
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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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int32_t id = touch->Identifier();
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if (!sCaptureTouchList->Get(id, nullptr)) {
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// If it is not already in the queue, it is a new touch
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touch->mChanged = true;
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}
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touch->mMessage = aEvent->mMessage;
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TouchInfo info = { touch, GetNonAnonymousAncestor(touch->mTarget),
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true };
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sCaptureTouchList->Put(id, info);
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}
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break;
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}
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case eTouchMove: {
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// Check for touches that changed. Mark them add to queue
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WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
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WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
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bool haveChanged = false;
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for (int32_t i = touches.Length(); i; ) {
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--i;
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Touch* touch = touches[i];
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if (!touch) {
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continue;
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}
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int32_t id = touch->Identifier();
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touch->mMessage = aEvent->mMessage;
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TouchInfo info;
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if (!sCaptureTouchList->Get(id, &info)) {
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touches.RemoveElementAt(i);
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continue;
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}
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RefPtr<Touch> oldTouch = info.mTouch;
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if (!touch->Equals(oldTouch)) {
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touch->mChanged = true;
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haveChanged = true;
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}
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nsCOMPtr<EventTarget> targetPtr = oldTouch->mTarget;
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if (!targetPtr) {
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touches.RemoveElementAt(i);
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continue;
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}
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nsCOMPtr<nsINode> targetNode(do_QueryInterface(targetPtr));
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if (!targetNode->IsInComposedDoc()) {
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targetPtr = do_QueryInterface(info.mNonAnonymousTarget);
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}
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touch->SetTarget(targetPtr);
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info.mTouch = touch;
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// info.mNonAnonymousTarget is still valid from above
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sCaptureTouchList->Put(id, info);
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// if we're moving from touchstart to touchmove for this touch
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// we allow preventDefault to prevent mouse events
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if (oldTouch->mMessage != touch->mMessage) {
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aTouchIsNew = true;
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}
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}
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// is nothing has changed, we should just return
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if (!haveChanged) {
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if (aTouchIsNew) {
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// however, if this is the first touchmove after a touchstart,
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// it is special in that preventDefault is allowed on it, so
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// we must dispatch it to content even if nothing changed. we
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// arbitrarily pick the first touch point to be the "changed"
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// touch because firing an event with no changed events doesn't
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// work.
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for (uint32_t i = 0; i < touchEvent->mTouches.Length(); ++i) {
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if (touchEvent->mTouches[i]) {
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touchEvent->mTouches[i]->mChanged = true;
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break;
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}
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}
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} else {
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return false;
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}
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}
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break;
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}
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case eTouchEnd:
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aIsHandlingUserInput = true;
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// Fall through to touchcancel code
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MOZ_FALLTHROUGH;
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case eTouchCancel: {
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// Remove the changed touches
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// need to make sure we only remove touches that are ending here
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WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
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WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
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for (uint32_t i = 0; i < touches.Length(); ++i) {
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Touch* touch = touches[i];
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if (!touch) {
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continue;
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}
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touch->mMessage = aEvent->mMessage;
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touch->mChanged = true;
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int32_t id = touch->Identifier();
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TouchInfo info;
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if (!sCaptureTouchList->Get(id, &info)) {
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continue;
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}
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nsCOMPtr<EventTarget> targetPtr = info.mTouch->mTarget;
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nsCOMPtr<nsINode> targetNode(do_QueryInterface(targetPtr));
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if (targetNode && !targetNode->IsInComposedDoc()) {
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targetPtr = do_QueryInterface(info.mNonAnonymousTarget);
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}
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aCurrentEventContent = do_QueryInterface(targetPtr);
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touch->SetTarget(targetPtr);
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sCaptureTouchList->Remove(id);
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}
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// add any touches left in the touch list, but ensure changed=false
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AppendToTouchList(&touches);
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break;
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}
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case eTouchPointerCancel: {
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// Don't generate pointer events by touch events after eTouchPointerCancel
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// is received.
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WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
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WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
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for (uint32_t i = 0; i < touches.Length(); ++i) {
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Touch* touch = touches[i];
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if (!touch) {
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continue;
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}
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int32_t id = touch->Identifier();
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TouchInfo info;
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if (!sCaptureTouchList->Get(id, &info)) {
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continue;
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}
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info.mConvertToPointer = false;
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sCaptureTouchList->Put(id, info);
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}
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break;
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}
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default:
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break;
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}
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return true;
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}
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/*static*/ already_AddRefed<nsIContent>
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TouchManager::GetAnyCapturedTouchTarget()
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{
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nsCOMPtr<nsIContent> result = nullptr;
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if (sCaptureTouchList->Count() == 0) {
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return result.forget();
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}
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for (auto iter = sCaptureTouchList->Iter(); !iter.Done(); iter.Next()) {
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RefPtr<Touch>& touch = iter.Data().mTouch;
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if (touch) {
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EventTarget* target = touch->GetTarget();
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if (target) {
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result = do_QueryInterface(target);
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break;
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}
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}
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}
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return result.forget();
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}
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/*static*/ bool
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TouchManager::HasCapturedTouch(int32_t aId)
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{
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return sCaptureTouchList->Contains(aId);
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}
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/*static*/ already_AddRefed<Touch>
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TouchManager::GetCapturedTouch(int32_t aId)
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{
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RefPtr<Touch> touch;
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TouchInfo info;
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if (sCaptureTouchList->Get(aId, &info)) {
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touch = info.mTouch;
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}
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return touch.forget();
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}
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/*static*/ bool
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TouchManager::ShouldConvertTouchToPointer(const Touch* aTouch,
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const WidgetTouchEvent* aEvent)
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{
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if (!aTouch || !aTouch->convertToPointer) {
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return false;
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}
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TouchInfo info;
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if (!sCaptureTouchList->Get(aTouch->Identifier(), &info)) {
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// This check runs before the TouchManager has the touch registered in its
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// touch list. It's because we dispatching pointer events before handling
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// touch events. So we convert eTouchStart to pointerdown even it's not
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// registered.
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// Check WidgetTouchEvent::mMessage because Touch::mMessage is assigned when
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// pre-handling touch events.
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return aEvent->mMessage == eTouchStart;
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}
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return info.mConvertToPointer;
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}
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} // namespace mozilla
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