mirror of
https://github.com/classilla/tenfourfox.git
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225 lines
7.2 KiB
C++
225 lines
7.2 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 "nsPresShell.h"
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nsRefPtrHashtable<nsUint32HashKey, dom::Touch>* TouchManager::gCaptureTouchList;
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/*static*/ void
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TouchManager::InitializeStatics()
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{
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NS_ASSERTION(!gCaptureTouchList, "InitializeStatics called multiple times!");
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gCaptureTouchList = new nsRefPtrHashtable<nsUint32HashKey, dom::Touch>;
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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(gCaptureTouchList, "ReleaseStatics called without Initialize!");
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delete gCaptureTouchList;
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gCaptureTouchList = 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 void
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EvictTouchPoint(RefPtr<dom::Touch>& aTouch,
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nsIDocument* aLimitToDocument = nullptr)
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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->GetCurrentDoc();
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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.widget = widget;
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event.time = PR_IntervalNow();
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event.touches.AppendElement(aTouch);
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nsEventStatus status;
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widget->DispatchEvent(&event, status);
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return;
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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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// We couldn't dispatch touchend. Remove the touch from gCaptureTouchList explicitly.
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TouchManager::gCaptureTouchList->Remove(aTouch->Identifier());
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}
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}
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static PLDHashOperator
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AppendToTouchList(const uint32_t& aKey, RefPtr<dom::Touch>& aData, void *aTouchList)
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{
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WidgetTouchEvent::TouchArray* touches =
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static_cast<WidgetTouchEvent::TouchArray*>(aTouchList);
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aData->mChanged = false;
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touches->AppendElement(aData);
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return PL_DHASH_NEXT;
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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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gCaptureTouchList->Enumerate(&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->touches.Length() == 1) {
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WidgetTouchEvent::AutoTouchArray touches;
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gCaptureTouchList->Enumerate(&AppendToTouchList, (void *)&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->touches.Length(); ++i) {
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dom::Touch* touch = touchEvent->touches[i];
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int32_t id = touch->Identifier();
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if (!gCaptureTouchList->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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gCaptureTouchList->Put(id, touch);
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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->touches;
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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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dom::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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RefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
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if (!oldTouch) {
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touches.RemoveElementAt(i);
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continue;
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}
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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<dom::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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touch->SetTarget(targetPtr);
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gCaptureTouchList->Put(id, touch);
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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->touches.Length(); ++i) {
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if (touchEvent->touches[i]) {
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touchEvent->touches[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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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->touches;
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for (uint32_t i = 0; i < touches.Length(); ++i) {
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dom::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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RefPtr<dom::Touch> oldTouch = gCaptureTouchList->GetWeak(id);
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if (!oldTouch) {
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continue;
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}
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nsCOMPtr<EventTarget> targetPtr = oldTouch->mTarget;
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aCurrentEventContent = do_QueryInterface(targetPtr);
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touch->SetTarget(targetPtr);
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gCaptureTouchList->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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gCaptureTouchList->Enumerate(&AppendToTouchList, (void *)&touches);
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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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