/* 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/. */
#ifndef mozilla_layers_TouchCounter_h
#define mozilla_layers_TouchCounter_h
#include "mozilla/EventForwards.h"
namespace mozilla {
class MultiTouchInput;
namespace layers {
// TouchCounter tracks the number of active touch points and whether the first
// move of the current touch block has been seen. Feed it your input events to
// update the internal state. Generally you should only be calling one of the
// Update functions, depending on which type of touch inputs you have access to.
class TouchCounter {
public:
TouchCounter();
void Update(
const MultiTouchInput& aInput);
void Update(
const WidgetTouchEvent& aEvent);
uint32_t GetActiveTouchCount()
const;
bool HasSeenFirstMove()
const {
return mFirstMoveSeen; }
private:
uint32_t mActiveTouchCount;
bool mFirstMoveSeen;
};
}
// namespace layers
}
// namespace mozilla
#endif /* mozilla_layers_TouchCounter_h */
