tor-browser

The Tor Browser
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TouchCounter.cpp (2232B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "TouchCounter.h"
      8 
      9 #include "InputData.h"
     10 #include "mozilla/TouchEvents.h"
     11 
     12 namespace mozilla {
     13 namespace layers {
     14 
     15 TouchCounter::TouchCounter() : mActiveTouchCount(0) {}
     16 
     17 void TouchCounter::Update(const MultiTouchInput& aInput) {
     18  switch (aInput.mType) {
     19    case MultiTouchInput::MULTITOUCH_START:
     20      // touch-start event contains all active touches of the current session
     21      mActiveTouchCount = aInput.mTouches.Length();
     22      break;
     23    case MultiTouchInput::MULTITOUCH_END:
     24      if (mActiveTouchCount >= aInput.mTouches.Length()) {
     25        // touch-end event contains only released touches
     26        mActiveTouchCount -= aInput.mTouches.Length();
     27      } else {
     28        NS_WARNING("Got an unexpected touchend");
     29        mActiveTouchCount = 0;
     30      }
     31      break;
     32    case MultiTouchInput::MULTITOUCH_CANCEL:
     33      mActiveTouchCount = 0;
     34      break;
     35    case MultiTouchInput::MULTITOUCH_MOVE:
     36      break;
     37  }
     38 }
     39 
     40 void TouchCounter::Update(const WidgetTouchEvent& aEvent) {
     41  switch (aEvent.mMessage) {
     42    case eTouchStart:
     43      // touch-start event contains all active touches of the current session
     44      mActiveTouchCount = aEvent.mTouches.Length();
     45      break;
     46    case eTouchEnd: {
     47      // touch-end contains all touches, but ones being lifted are marked as
     48      // changed
     49      uint32_t liftedTouches = 0;
     50      for (const auto& touch : aEvent.mTouches) {
     51        if (touch->mChanged) {
     52          liftedTouches++;
     53        }
     54      }
     55      if (mActiveTouchCount >= liftedTouches) {
     56        mActiveTouchCount -= liftedTouches;
     57      } else {
     58        NS_WARNING("Got an unexpected touchend");
     59        mActiveTouchCount = 0;
     60      }
     61      break;
     62    }
     63    case eTouchCancel:
     64      mActiveTouchCount = 0;
     65      break;
     66    default:
     67      break;
     68  }
     69 }
     70 
     71 uint32_t TouchCounter::GetActiveTouchCount() const { return mActiveTouchCount; }
     72 
     73 }  // namespace layers
     74 }  // namespace mozilla