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lightning-sunbird  0.9+nobinonly
nsRepeatService.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla Communicator client code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
00026  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 //
00039 // Eric Vaughan
00040 // Netscape Communications
00041 //
00042 // See documentation in associated header file
00043 //
00044 
00045 #include "nsRepeatService.h"
00046 #include "nsIServiceManager.h"
00047 
00048 #if defined(XP_MAC) || defined(XP_MACOSX)
00049 #define INITAL_REPEAT_DELAY 250
00050 #define REPEAT_DELAY        25
00051 #else
00052 #define INITAL_REPEAT_DELAY 250
00053 #define REPEAT_DELAY        50
00054 #endif
00055 
00056 nsRepeatService* nsRepeatService::gInstance = nsnull;
00057 
00058 nsRepeatService::nsRepeatService()
00059 : mFirstCall(PR_FALSE)
00060 {
00061 }
00062 
00063 nsRepeatService::~nsRepeatService()
00064 {
00065   Stop();
00066 }
00067 
00068 nsRepeatService* 
00069 nsRepeatService::GetInstance()
00070 {
00071   if (!gInstance) {
00072     gInstance = new nsRepeatService();
00073     NS_IF_ADDREF(gInstance);
00074   }
00075   return gInstance;
00076 }
00077 
00078 /*static*/ void
00079 nsRepeatService::Shutdown()
00080 {
00081   NS_IF_RELEASE(gInstance);
00082 }
00083 
00084 void nsRepeatService::Start(nsITimerCallback* aCallback)
00085 {
00086   NS_PRECONDITION(aCallback != nsnull, "null ptr");
00087   if (! aCallback)
00088     return;
00089 
00090   mCallback = aCallback;
00091   nsresult rv;
00092   mRepeatTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
00093 
00094   if (NS_OK == rv)  {
00095     mRepeatTimer->InitWithCallback(this, INITAL_REPEAT_DELAY, nsITimer::TYPE_ONE_SHOT);
00096   }
00097 
00098 }
00099 
00100 void nsRepeatService::Stop()
00101 {
00102   //printf("Stopping repeat timer\n");
00103   if (mRepeatTimer) {
00104      mRepeatTimer->Cancel();
00105      mRepeatTimer = nsnull;
00106      mCallback = nsnull;
00107   }
00108 }
00109 
00110 NS_IMETHODIMP nsRepeatService::Notify(nsITimer *timer)
00111 {
00112    // if the repeat delay is the initial one reset it.
00113   if (mRepeatTimer) {
00114      mRepeatTimer->Cancel();
00115   }
00116 
00117   // do callback
00118   if (mCallback)
00119     mCallback->Notify(timer);
00120 
00121   // start timer again.
00122   if (mRepeatTimer) {
00123      mRepeatTimer = do_CreateInstance("@mozilla.org/timer;1");
00124      mRepeatTimer->InitWithCallback(this, REPEAT_DELAY, nsITimer::TYPE_ONE_SHOT);
00125   }
00126   return NS_OK;
00127 }
00128 
00129 NS_IMPL_ISUPPORTS1(nsRepeatService, nsITimerCallback)
00130