tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

nsRepeatService.cpp (2704B)

      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 //
      8 // Eric Vaughan
      9 // Netscape Communications
     10 //
     11 // See documentation in associated header file
     12 //
     13 
     14 #include "nsRepeatService.h"
     15 
     16 #include "mozilla/StaticPtr.h"
     17 #include "mozilla/dom/Document.h"
     18 
     19 using namespace mozilla;
     20 
     21 static StaticAutoPtr<nsRepeatService> gRepeatService;
     22 
     23 nsRepeatService::nsRepeatService()
     24    : mCallback(nullptr), mCallbackData(nullptr) {}
     25 
     26 nsRepeatService::~nsRepeatService() {
     27  NS_ASSERTION(!mCallback && !mCallbackData,
     28               "Callback was not removed before shutdown");
     29 }
     30 
     31 /* static */
     32 nsRepeatService* nsRepeatService::GetInstance() {
     33  if (!gRepeatService) {
     34    gRepeatService = new nsRepeatService();
     35  }
     36  return gRepeatService;
     37 }
     38 
     39 /*static*/
     40 void nsRepeatService::Shutdown() { gRepeatService = nullptr; }
     41 
     42 void nsRepeatService::Start(Callback aCallback, void* aCallbackData,
     43                            dom::Document* aDocument,
     44                            const nsACString& aCallbackName,
     45                            uint32_t aInitialDelay) {
     46  MOZ_ASSERT(aCallback != nullptr, "null ptr");
     47 
     48  mCallback = aCallback;
     49  mCallbackData = aCallbackData;
     50  mCallbackName = aCallbackName;
     51 
     52  mRepeatTimer = NS_NewTimer(GetMainThreadSerialEventTarget());
     53 
     54  if (mRepeatTimer) {
     55    InitTimerCallback(aInitialDelay);
     56  }
     57 }
     58 
     59 void nsRepeatService::Stop(Callback aCallback, void* aCallbackData) {
     60  if (mCallback != aCallback || mCallbackData != aCallbackData) {
     61    return;
     62  }
     63 
     64  // printf("Stopping repeat timer\n");
     65  if (mRepeatTimer) {
     66    mRepeatTimer->Cancel();
     67    mRepeatTimer = nullptr;
     68  }
     69  mCallback = nullptr;
     70  mCallbackData = nullptr;
     71 }
     72 
     73 void nsRepeatService::InitTimerCallback(uint32_t aInitialDelay) {
     74  if (!mRepeatTimer) {
     75    return;
     76  }
     77 
     78  mRepeatTimer->InitWithNamedFuncCallback(
     79      [](nsITimer* aTimer, void* aClosure) {
     80        // Use gRepeatService instead of nsRepeatService::GetInstance() (because
     81        // we don't want nsRepeatService::GetInstance() to re-create a new
     82        // instance for us, if we happen to get invoked after
     83        // nsRepeatService::Shutdown() has nulled out gRepeatService).
     84        nsRepeatService* rs = gRepeatService;
     85        if (!rs) {
     86          return;
     87        }
     88 
     89        if (rs->mCallback) {
     90          rs->mCallback(rs->mCallbackData);
     91        }
     92 
     93        rs->InitTimerCallback(REPEAT_DELAY);
     94      },
     95      nullptr, aInitialDelay, nsITimer::TYPE_ONE_SHOT, mCallbackName);
     96 }