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Mypal/layout/base/TouchManager.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include "TouchManager.h"
#include "mozilla/dom/EventTarget.h"
#include "nsIFrame.h"
#include "nsPresShell.h"
#include "nsView.h"
using namespace mozilla::dom;
namespace mozilla {
nsDataHashtable<nsUint32HashKey, TouchManager::TouchInfo>* TouchManager::sCaptureTouchList;
/*static*/ void
TouchManager::InitializeStatics()
{
NS_ASSERTION(!sCaptureTouchList, "InitializeStatics called multiple times!");
sCaptureTouchList = new nsDataHashtable<nsUint32HashKey, TouchManager::TouchInfo>;
}
/*static*/ void
TouchManager::ReleaseStatics()
{
NS_ASSERTION(sCaptureTouchList, "ReleaseStatics called without Initialize!");
delete sCaptureTouchList;
sCaptureTouchList = nullptr;
}
void
TouchManager::Init(PresShell* aPresShell, nsIDocument* aDocument)
{
mPresShell = aPresShell;
mDocument = aDocument;
}
void
TouchManager::Destroy()
{
EvictTouches();
mDocument = nullptr;
mPresShell = nullptr;
}
static nsIContent*
GetNonAnonymousAncestor(dom::EventTarget* aTarget)
{
nsCOMPtr<nsIContent> content(do_QueryInterface(aTarget));
if (content && content->IsInNativeAnonymousSubtree()) {
content = content->FindFirstNonChromeOnlyAccessContent();
}
return content;
}
/*static*/ void
TouchManager::EvictTouchPoint(RefPtr<dom::Touch>& aTouch,
nsIDocument* aLimitToDocument)
{
nsCOMPtr<nsINode> node(do_QueryInterface(aTouch->mTarget));
if (node) {
nsIDocument* doc = node->GetUncomposedDoc();
if (doc && (!aLimitToDocument || aLimitToDocument == doc)) {
nsIPresShell* presShell = doc->GetShell();
if (presShell) {
nsIFrame* frame = presShell->GetRootFrame();
if (frame) {
nsPoint pt(aTouch->mRefPoint.x, aTouch->mRefPoint.y);
nsCOMPtr<nsIWidget> widget = frame->GetView()->GetNearestWidget(&pt);
if (widget) {
WidgetTouchEvent event(true, eTouchEnd, widget);
event.mTime = PR_IntervalNow();
event.mTouches.AppendElement(aTouch);
nsEventStatus status;
widget->DispatchEvent(&event, status);
}
}
}
}
}
if (!node || !aLimitToDocument || node->OwnerDoc() == aLimitToDocument) {
sCaptureTouchList->Remove(aTouch->Identifier());
}
}
/*static*/ void
TouchManager::AppendToTouchList(WidgetTouchEvent::TouchArray* aTouchList)
{
for (auto iter = sCaptureTouchList->Iter();
!iter.Done();
iter.Next()) {
RefPtr<dom::Touch>& touch = iter.Data().mTouch;
touch->mChanged = false;
aTouchList->AppendElement(touch);
}
}
void
TouchManager::EvictTouches()
{
WidgetTouchEvent::AutoTouchArray touches;
AppendToTouchList(&touches);
for (uint32_t i = 0; i < touches.Length(); ++i) {
EvictTouchPoint(touches[i], mDocument);
}
}
bool
TouchManager::PreHandleEvent(WidgetEvent* aEvent,
nsEventStatus* aStatus,
bool& aTouchIsNew,
bool& aIsHandlingUserInput,
nsCOMPtr<nsIContent>& aCurrentEventContent)
{
switch (aEvent->mMessage) {
case eTouchStart: {
aIsHandlingUserInput = true;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// if there is only one touch in this touchstart event, assume that it is
// the start of a new touch session and evict any old touches in the
// queue
if (touchEvent->mTouches.Length() == 1) {
WidgetTouchEvent::AutoTouchArray touches;
AppendToTouchList(&touches);
for (uint32_t i = 0; i < touches.Length(); ++i) {
EvictTouchPoint(touches[i]);
}
}
// Add any new touches to the queue
for (uint32_t i = 0; i < touchEvent->mTouches.Length(); ++i) {
dom::Touch* touch = touchEvent->mTouches[i];
int32_t id = touch->Identifier();
if (!sCaptureTouchList->Get(id, nullptr)) {
// If it is not already in the queue, it is a new touch
touch->mChanged = true;
}
touch->mMessage = aEvent->mMessage;
TouchInfo info = { touch, GetNonAnonymousAncestor(touch->mTarget) };
sCaptureTouchList->Put(id, info);
}
break;
}
case eTouchMove: {
// Check for touches that changed. Mark them add to queue
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
bool haveChanged = false;
for (int32_t i = touches.Length(); i; ) {
--i;
dom::Touch* touch = touches[i];
if (!touch) {
continue;
}
int32_t id = touch->Identifier();
touch->mMessage = aEvent->mMessage;
TouchInfo info;
if (!sCaptureTouchList->Get(id, &info)) {
touches.RemoveElementAt(i);
continue;
}
RefPtr<dom::Touch> oldTouch = info.mTouch;
if (!touch->Equals(oldTouch)) {
touch->mChanged = true;
haveChanged = true;
}
nsCOMPtr<dom::EventTarget> targetPtr = oldTouch->mTarget;
if (!targetPtr) {
touches.RemoveElementAt(i);
continue;
}
nsCOMPtr<nsINode> targetNode(do_QueryInterface(targetPtr));
if (!targetNode->IsInComposedDoc()) {
targetPtr = do_QueryInterface(info.mNonAnonymousTarget);
}
touch->SetTarget(targetPtr);
info.mTouch = touch;
// info.mNonAnonymousTarget is still valid from above
sCaptureTouchList->Put(id, info);
// if we're moving from touchstart to touchmove for this touch
// we allow preventDefault to prevent mouse events
if (oldTouch->mMessage != touch->mMessage) {
aTouchIsNew = true;
}
}
// is nothing has changed, we should just return
if (!haveChanged) {
if (aTouchIsNew) {
// however, if this is the first touchmove after a touchstart,
// it is special in that preventDefault is allowed on it, so
// we must dispatch it to content even if nothing changed. we
// arbitrarily pick the first touch point to be the "changed"
// touch because firing an event with no changed events doesn't
// work.
for (uint32_t i = 0; i < touchEvent->mTouches.Length(); ++i) {
if (touchEvent->mTouches[i]) {
touchEvent->mTouches[i]->mChanged = true;
break;
}
}
} else {
return false;
}
}
break;
}
case eTouchEnd:
aIsHandlingUserInput = true;
// Fall through to touchcancel code
MOZ_FALLTHROUGH;
case eTouchCancel: {
// Remove the changed touches
// need to make sure we only remove touches that are ending here
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
dom::Touch* touch = touches[i];
if (!touch) {
continue;
}
touch->mMessage = aEvent->mMessage;
touch->mChanged = true;
int32_t id = touch->Identifier();
TouchInfo info;
if (!sCaptureTouchList->Get(id, &info)) {
continue;
}
nsCOMPtr<EventTarget> targetPtr = info.mTouch->mTarget;
nsCOMPtr<nsINode> targetNode(do_QueryInterface(targetPtr));
if (targetNode && !targetNode->IsInComposedDoc()) {
targetPtr = do_QueryInterface(info.mNonAnonymousTarget);
}
aCurrentEventContent = do_QueryInterface(targetPtr);
touch->SetTarget(targetPtr);
sCaptureTouchList->Remove(id);
}
// add any touches left in the touch list, but ensure changed=false
AppendToTouchList(&touches);
break;
}
default:
break;
}
return true;
}
/*static*/ already_AddRefed<nsIContent>
TouchManager::GetAnyCapturedTouchTarget()
{
nsCOMPtr<nsIContent> result = nullptr;
if (sCaptureTouchList->Count() == 0) {
return result.forget();
}
for (auto iter = sCaptureTouchList->Iter(); !iter.Done(); iter.Next()) {
RefPtr<dom::Touch>& touch = iter.Data().mTouch;
if (touch) {
dom::EventTarget* target = touch->GetTarget();
if (target) {
result = do_QueryInterface(target);
break;
}
}
}
return result.forget();
}
/*static*/ bool
TouchManager::HasCapturedTouch(int32_t aId)
{
return sCaptureTouchList->Contains(aId);
}
/*static*/ already_AddRefed<dom::Touch>
TouchManager::GetCapturedTouch(int32_t aId)
{
RefPtr<dom::Touch> touch;
TouchInfo info;
if (sCaptureTouchList->Get(aId, &info)) {
touch = info.mTouch;
}
return touch.forget();
}
} // namespace mozilla
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