Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #include "ScrollLinkedEffectDetector.h"
       7             : 
       8             : #include "nsIDocument.h"
       9             : #include "nsThreadUtils.h"
      10             : 
      11             : namespace mozilla {
      12             : namespace layers {
      13             : 
      14             : uint32_t ScrollLinkedEffectDetector::sDepth = 0;
      15             : bool ScrollLinkedEffectDetector::sFoundScrollLinkedEffect = false;
      16             : 
      17             : /* static */ void
      18           0 : ScrollLinkedEffectDetector::PositioningPropertyMutated()
      19             : {
      20           0 :   MOZ_ASSERT(NS_IsMainThread());
      21             : 
      22           0 :   if (sDepth > 0) {
      23             :     // We are inside a scroll event dispatch
      24           0 :     sFoundScrollLinkedEffect = true;
      25             :   }
      26           0 : }
      27             : 
      28           0 : ScrollLinkedEffectDetector::ScrollLinkedEffectDetector(nsIDocument* aDoc)
      29           0 :   : mDocument(aDoc)
      30             : {
      31           0 :   MOZ_ASSERT(NS_IsMainThread());
      32           0 :   sDepth++;
      33           0 : }
      34             : 
      35           0 : ScrollLinkedEffectDetector::~ScrollLinkedEffectDetector()
      36             : {
      37           0 :   sDepth--;
      38           0 :   if (sDepth == 0) {
      39             :     // We have exited all (possibly-nested) scroll event dispatches,
      40             :     // record whether or not we found an effect, and reset state
      41           0 :     if (sFoundScrollLinkedEffect) {
      42           0 :       mDocument->ReportHasScrollLinkedEffect();
      43           0 :       sFoundScrollLinkedEffect = false;
      44             :     }
      45             :   }
      46           0 : }
      47             : 
      48             : } // namespace layers
      49             : } // namespace mozilla