gecko-dev/layout/xul/nsRepeatService.cpp

105 строки
2.6 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//
#include "nsRepeatService.h"
#include "mozilla/StaticPtr.h"
#include "nsIDocument.h"
#include "nsIServiceManager.h"
using namespace mozilla;
static StaticAutoPtr<nsRepeatService> gRepeatService;
nsRepeatService::nsRepeatService()
: mCallback(nullptr), mCallbackData(nullptr)
{
}
nsRepeatService::~nsRepeatService()
{
NS_ASSERTION(!mCallback && !mCallbackData, "Callback was not removed before shutdown");
}
/* static */ nsRepeatService*
nsRepeatService::GetInstance()
{
if (!gRepeatService) {
gRepeatService = new nsRepeatService();
}
return gRepeatService;
}
/*static*/ void
nsRepeatService::Shutdown()
{
gRepeatService = nullptr;
}
void
nsRepeatService::Start(Callback aCallback, void* aCallbackData,
nsIDocument* aDocument, const nsACString& aCallbackName,
uint32_t aInitialDelay)
{
MOZ_ASSERT(aCallback != nullptr, "null ptr");
mCallback = aCallback;
mCallbackData = aCallbackData;
mCallbackName = aCallbackName;
mRepeatTimer = NS_NewTimer(
aDocument->EventTargetFor(TaskCategory::Other));
if (mRepeatTimer) {
InitTimerCallback(aInitialDelay);
}
}
void nsRepeatService::Stop(Callback aCallback, void* aCallbackData)
{
if (mCallback != aCallback || mCallbackData != aCallbackData)
return;
//printf("Stopping repeat timer\n");
if (mRepeatTimer) {
mRepeatTimer->Cancel();
mRepeatTimer = nullptr;
}
mCallback = nullptr;
mCallbackData = nullptr;
}
void
nsRepeatService::InitTimerCallback(uint32_t aInitialDelay)
{
if (!mRepeatTimer) {
return;
}
mRepeatTimer->InitWithNamedFuncCallback([](nsITimer* aTimer, void* aClosure) {
// Use gRepeatService instead of nsRepeatService::GetInstance() (because
// we don't want nsRepeatService::GetInstance() to re-create a new instance
// for us, if we happen to get invoked after nsRepeatService::Shutdown() has
// nulled out gRepeatService).
nsRepeatService* rs = gRepeatService;
if (!rs) {
return;
}
if (rs->mCallback) {
rs->mCallback(rs->mCallbackData);
}
rs->InitTimerCallback(REPEAT_DELAY);
}, nullptr, aInitialDelay, nsITimer::TYPE_ONE_SHOT, mCallbackName.Data());
}