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