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234 lines
8.7 KiB
Plaintext
234 lines
8.7 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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interface nsIObserver;
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interface nsIEventTarget;
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%{C++
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/**
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* The signature of the timer callback function passed to initWithFuncCallback.
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* This is the function that will get called when the timer expires if the
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* timer is initialized via initWithFuncCallback.
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*
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* @param aTimer the timer which has expired
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* @param aClosure opaque parameter passed to initWithFuncCallback
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*
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* Implementers should return the following:
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*
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* @return NS_OK
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*
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*/
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class nsITimer;
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typedef void (*nsTimerCallbackFunc) (nsITimer *aTimer, void *aClosure);
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%}
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native nsTimerCallbackFunc(nsTimerCallbackFunc);
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/**
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* The callback interface for timers.
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*/
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interface nsITimer;
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[function, scriptable, uuid(a796816d-7d47-4348-9ab8-c7aeb3216a7d)]
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interface nsITimerCallback : nsISupports
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{
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/**
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* @param aTimer the timer which has expired
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*/
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void notify(in nsITimer timer);
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};
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%{C++
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// Two timer deadlines must differ by less than half the PRIntervalTime domain.
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#define DELAY_INTERVAL_LIMIT PR_BIT(8 * sizeof(PRIntervalTime) - 1)
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%}
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/**
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* nsITimer instances must be initialized by calling one of the "init" methods
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* documented below. You may also re-initialize (using one of the init()
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* methods) an existing instance to avoid the overhead of destroying and
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* creating a timer. It is not necessary to cancel the timer in that case.
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*/
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[scriptable, uuid(193fc37a-8aa4-4d29-aa57-1acd87c26b66)]
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interface nsITimer : nsISupports
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{
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/* Timer types */
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/**
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* Type of a timer that fires once only.
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*/
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const short TYPE_ONE_SHOT = 0;
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/**
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* After firing, a TYPE_REPEATING_SLACK timer is stopped and not restarted
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* until its callback completes. Specified timer period will be at least
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* the time between when processing for last firing the callback completes
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* and when the next firing occurs.
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*
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* This is the preferable repeating type for most situations.
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*/
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const short TYPE_REPEATING_SLACK = 1;
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/**
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* An TYPE_REPEATING_PRECISE repeating timer aims to have constant period
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* between firings. The processing time for each timer callback should not
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* influence the timer period. However, if the processing for the last
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* timer firing could not be completed until just before the next firing
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* occurs, then you could have two timer notification routines being
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* executed in quick succession. Furthermore, if your callback processing
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* time is longer than the timer period, then the timer will post more
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* notifications while your callback is running. For example, if a
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* REPEATING_PRECISE timer has a 10ms period and a callback takes 50ms,
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* then by the time the callback is done there will be 5 events to run the
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* timer callback in the event queue. Furthermore, the next scheduled time
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* will always advance by exactly the delay every time the timer fires.
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* This means that if the clock increments without the timer thread running
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* (e.g. the computer is asleep) when the timer thread gets to run again it
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* will post all the events that it "missed" while it wasn't running. Use
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* this timer type with extreme caution. Chances are, this is not what you
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* want.
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*/
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const short TYPE_REPEATING_PRECISE = 2;
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/**
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* A TYPE_REPEATING_PRECISE_CAN_SKIP repeating timer aims to have constant
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* period between firings. The processing time for each timer callback
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* should not influence the timer period. However this timer type
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* guarantees that it will not queue up new events to fire the callback
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* until the previous callback event finishes firing. If the callback
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* takes a long time, then the next callback will be scheduled immediately
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* afterward, but only once, unlike TYPE_REPEATING_PRECISE. If you want a
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* non-slack timer, you probably want this one.
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*/
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const short TYPE_REPEATING_PRECISE_CAN_SKIP = 3;
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/**
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* Initialize a timer that will fire after the said delay.
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* A user must keep a reference to this timer till it is
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* is no longer needed or has been cancelled.
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*
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* @param aObserver the callback object that observes the
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* ``timer-callback'' topic with the subject being
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* the timer itself when the timer fires:
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*
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* observe(nsISupports aSubject, => nsITimer
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* string aTopic, => ``timer-callback''
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* wstring data => null
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*
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* @param aDelay delay in milliseconds for timer to fire
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* @param aType timer type per TYPE* consts defined above
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*/
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void init(in nsIObserver aObserver, in unsigned long aDelay,
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in unsigned long aType);
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/**
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* Initialize a timer to fire after the given millisecond interval.
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* This version takes a function to call and a closure to pass to
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* that function.
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*
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* @param aFunc The function to invoke
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* @param aClosure An opaque pointer to pass to that function
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* @param aDelay The millisecond interval
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* @param aType Timer type per TYPE* consts defined above
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*/
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[noscript] void initWithFuncCallback(in nsTimerCallbackFunc aCallback,
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in voidPtr aClosure,
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in unsigned long aDelay,
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in unsigned long aType);
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/**
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* Initialize a timer to fire after the given millisecond interval.
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* This version takes a function to call.
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*
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* @param aFunc nsITimerCallback interface to call when timer expires
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* @param aDelay The millisecond interval
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* @param aType Timer type per TYPE* consts defined above
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*/
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void initWithCallback(in nsITimerCallback aCallback,
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in unsigned long aDelay,
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in unsigned long aType);
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/**
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* Cancel the timer. This method works on all types, not just on repeating
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* timers -- you might want to cancel a TYPE_ONE_SHOT timer, and even reuse
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* it by re-initializing it (to avoid object destruction and creation costs
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* by conserving one timer instance).
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*/
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void cancel();
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/**
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* The millisecond delay of the timeout.
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*
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* NOTE: Re-setting the delay on a one-shot timer that has already fired
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* doesn't restart the timer. Call one of the init() methods to restart
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* a one-shot timer.
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*/
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attribute unsigned long delay;
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/**
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* The timer type - one of the above TYPE_* constants.
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*/
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attribute unsigned long type;
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/**
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* The opaque pointer pass to initWithFuncCallback.
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*/
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[noscript] readonly attribute voidPtr closure;
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/**
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* The nsITimerCallback object passed to initWithCallback.
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*/
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readonly attribute nsITimerCallback callback;
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/**
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* The nsIEventTarget where the callback will be dispatched. Note that this
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* target may only be set before the call to one of the init methods above.
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*/
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attribute nsIEventTarget target;
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};
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%{C++
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#define NS_TIMER_CONTRACTID "@mozilla.org/timer;1"
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#define NS_TIMER_CALLBACK_TOPIC "timer-callback"
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%}
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