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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "CoalescedTouchData.h"
#include "BrowserChild.h"
#include "mozilla/dom/PointerEventHandler.h"
using namespace mozilla;
using namespace mozilla::dom;
static const uint32_t sMaxTouchMoveIdentifiers = 10;
void CoalescedTouchData::CreateCoalescedTouchEvent(
const WidgetTouchEvent& aEvent) {
MOZ_ASSERT(IsEmpty());
mCoalescedInputEvent = MakeUnique<WidgetTouchEvent>(aEvent);
for (size_t i = 0; i < mCoalescedInputEvent->mTouches.Length(); i++) {
const RefPtr<Touch>& touch = mCoalescedInputEvent->mTouches[i];
touch->mCoalescedWidgetEvents = MakeAndAddRef<WidgetPointerEventHolder>();
// Add an initial event into coalesced events, so
// the relevant pointer event would at least contain one coalesced event.
WidgetPointerEvent* event =
touch->mCoalescedWidgetEvents->mEvents.AppendElement(WidgetPointerEvent(
aEvent.IsTrusted(), ePointerMove, aEvent.mWidget));
PointerEventHandler::InitPointerEventFromTouch(*event, aEvent, *touch);
event->mFlags.mBubbles = false;
event->mFlags.mCancelable = false;
}
}
void CoalescedTouchData::Coalesce(const WidgetTouchEvent& aEvent,
const ScrollableLayerGuid& aGuid,
const uint64_t& aInputBlockId,
const nsEventStatus& aApzResponse) {
MOZ_ASSERT(aEvent.mMessage == eTouchMove);
if (IsEmpty()) {
CreateCoalescedTouchEvent(aEvent);
mGuid = aGuid;
mInputBlockId = aInputBlockId;
mApzResponse = aApzResponse;
} else {
MOZ_ASSERT(mGuid == aGuid);
MOZ_ASSERT(mInputBlockId == aInputBlockId);
MOZ_ASSERT(mCoalescedInputEvent->mModifiers == aEvent.mModifiers);
MOZ_ASSERT(mCoalescedInputEvent->mInputSource == aEvent.mInputSource);
for (size_t i = 0; i < aEvent.mTouches.Length(); i++) {
const RefPtr<Touch>& touch = aEvent.mTouches[i];
// Get the same touch in the original event
RefPtr<Touch> sameTouch = GetTouch(touch->Identifier());
// The checks in CoalescedTouchData::CanCoalesce ensure it should never
// be null.
MOZ_ASSERT(sameTouch);
MOZ_ASSERT(sameTouch->mCoalescedWidgetEvents);
MOZ_ASSERT(!sameTouch->mCoalescedWidgetEvents->mEvents.IsEmpty());
if (!sameTouch->Equals(touch)) {
sameTouch->SetSameAs(touch);
WidgetPointerEvent* event =
sameTouch->mCoalescedWidgetEvents->mEvents.AppendElement(
WidgetPointerEvent(aEvent.IsTrusted(), ePointerMove,
aEvent.mWidget));
PointerEventHandler::InitPointerEventFromTouch(*event, aEvent, *touch);
event->mFlags.mBubbles = false;
event->mFlags.mCancelable = false;
}
}
mCoalescedInputEvent->mTimeStamp = aEvent.mTimeStamp;
}
}
bool CoalescedTouchData::CanCoalesce(const WidgetTouchEvent& aEvent,
const ScrollableLayerGuid& aGuid,
const uint64_t& aInputBlockId,
const nsEventStatus& aApzResponse) {
MOZ_ASSERT(!IsEmpty());
if (mGuid != aGuid || mInputBlockId != aInputBlockId ||
mCoalescedInputEvent->mModifiers != aEvent.mModifiers ||
mCoalescedInputEvent->mInputSource != aEvent.mInputSource ||
aEvent.mTouches.Length() > sMaxTouchMoveIdentifiers) {
return false;
}
// Ensures both touchmove events have the same touches
if (aEvent.mTouches.Length() != mCoalescedInputEvent->mTouches.Length()) {
return false;
}
for (const RefPtr<Touch>& touch : aEvent.mTouches) {
if (!GetTouch(touch->Identifier())) {
return false;
}
}
// If one of them is eIgnore and the other one is eConsumeDoDefault,
// we always coalesce them to eConsumeDoDefault.
if (mApzResponse != aApzResponse) {
if (mApzResponse == nsEventStatus::nsEventStatus_eIgnore &&
aApzResponse == nsEventStatus::nsEventStatus_eConsumeDoDefault) {
mApzResponse = aApzResponse;
} else if (mApzResponse != nsEventStatus::nsEventStatus_eConsumeDoDefault ||
aApzResponse != nsEventStatus::nsEventStatus_eIgnore) {
return false;
}
}
return true;
}
Touch* CoalescedTouchData::GetTouch(int32_t aIdentifier) {
for (const RefPtr<Touch>& touch : mCoalescedInputEvent->mTouches) {
if (touch->Identifier() == aIdentifier) {
return touch;
}
}
return nullptr;
}
void CoalescedTouchMoveFlusher::WillRefresh(mozilla::TimeStamp aTime) {
MOZ_ASSERT(mRefreshDriver);
mBrowserChild->ProcessPendingCoalescedTouchData();
}
CoalescedTouchMoveFlusher::CoalescedTouchMoveFlusher(
BrowserChild* aBrowserChild)
: CoalescedInputFlusher(aBrowserChild) {}
CoalescedTouchMoveFlusher::~CoalescedTouchMoveFlusher() { RemoveObserver(); }
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