Source code
Revision control
Copy as Markdown
Other Tools
/* -*- 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
#include "TouchCounter.h"
#include "InputData.h"
#include "mozilla/TouchEvents.h"
namespace mozilla {
namespace layers {
TouchCounter::TouchCounter() : mActiveTouchCount(0) {}
void TouchCounter::Update(const MultiTouchInput& aInput) {
switch (aInput.mType) {
case MultiTouchInput::MULTITOUCH_START:
// touch-start event contains all active touches of the current session
mActiveTouchCount = aInput.mTouches.Length();
break;
case MultiTouchInput::MULTITOUCH_END:
if (mActiveTouchCount >= aInput.mTouches.Length()) {
// touch-end event contains only released touches
mActiveTouchCount -= aInput.mTouches.Length();
} else {
NS_WARNING("Got an unexpected touchend");
mActiveTouchCount = 0;
}
break;
case MultiTouchInput::MULTITOUCH_CANCEL:
mActiveTouchCount = 0;
break;
case MultiTouchInput::MULTITOUCH_MOVE:
break;
}
}
void TouchCounter::Update(const WidgetTouchEvent& aEvent) {
switch (aEvent.mMessage) {
case eTouchStart:
// touch-start event contains all active touches of the current session
mActiveTouchCount = aEvent.mTouches.Length();
break;
case eTouchEnd: {
// touch-end contains all touches, but ones being lifted are marked as
// changed
uint32_t liftedTouches = 0;
for (const auto& touch : aEvent.mTouches) {
if (touch->mChanged) {
liftedTouches++;
}
}
if (mActiveTouchCount >= liftedTouches) {
mActiveTouchCount -= liftedTouches;
} else {
NS_WARNING("Got an unexpected touchend");
mActiveTouchCount = 0;
}
break;
}
case eTouchCancel:
mActiveTouchCount = 0;
break;
default:
break;
}
}
uint32_t TouchCounter::GetActiveTouchCount() const { return mActiveTouchCount; }
} // namespace layers
} // namespace mozilla