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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 "TouchCounter.h"
#include "InputData.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/touchcancel");
mActiveTouchCount = 0;
}
break;
case MultiTouchInput::MULTITOUCH_CANCEL:
mActiveTouchCount = 0;
break;
default:
break;
}
}
uint32_t
TouchCounter::GetActiveTouchCount() const
{
return mActiveTouchCount;
}
} // namespace layers
} // namespace mozilla
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