74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "TouchCounter.h"
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#include "InputData.h"
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#include "mozilla/TouchEvents.h"
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namespace mozilla {
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namespace layers {
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TouchCounter::TouchCounter() : mActiveTouchCount(0) {}
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void TouchCounter::Update(const MultiTouchInput& aInput) {
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switch (aInput.mType) {
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case MultiTouchInput::MULTITOUCH_START:
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// touch-start event contains all active touches of the current session
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mActiveTouchCount = aInput.mTouches.Length();
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break;
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case MultiTouchInput::MULTITOUCH_END:
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if (mActiveTouchCount >= aInput.mTouches.Length()) {
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// touch-end event contains only released touches
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mActiveTouchCount -= aInput.mTouches.Length();
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} else {
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NS_WARNING("Got an unexpected touchend");
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mActiveTouchCount = 0;
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}
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break;
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case MultiTouchInput::MULTITOUCH_CANCEL:
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mActiveTouchCount = 0;
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break;
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case MultiTouchInput::MULTITOUCH_MOVE:
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break;
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}
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}
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void TouchCounter::Update(const WidgetTouchEvent& aEvent) {
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switch (aEvent.mMessage) {
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case eTouchStart:
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// touch-start event contains all active touches of the current session
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mActiveTouchCount = aEvent.mTouches.Length();
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break;
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case eTouchEnd: {
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// touch-end contains all touches, but ones being lifted are marked as
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// changed
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uint32_t liftedTouches = 0;
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for (const auto& touch : aEvent.mTouches) {
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if (touch->mChanged) {
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liftedTouches++;
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}
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}
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if (mActiveTouchCount >= liftedTouches) {
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mActiveTouchCount -= liftedTouches;
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} else {
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NS_WARNING("Got an unexpected touchend");
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mActiveTouchCount = 0;
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}
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break;
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}
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case eTouchCancel:
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mActiveTouchCount = 0;
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break;
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default:
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break;
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}
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}
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uint32_t TouchCounter::GetActiveTouchCount() const { return mActiveTouchCount; }
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} // namespace layers
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} // namespace mozilla
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