245 lines
8.9 KiB
Plaintext
245 lines
8.9 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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#include "mozilla/MemoryReporting.h"
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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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class nsITimer;
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typedef void (*nsTimerCallbackFunc) (nsITimer *aTimer, void *aClosure);
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/**
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* The signature of the timer name callback function passed to
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* initWithNameableFuncCallback.
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* This is the function that will get called when timer profiling is enabled
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* via the "TimerFirings" log module.
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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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* @param aBuf a buffer in which to put the name
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* @param aLen the length of the buffer
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*/
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typedef void (*nsTimerNameCallbackFunc) (nsITimer *aTimer, void *aClosure,
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char *aBuf, size_t aLen);
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%}
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native nsTimerCallbackFunc(nsTimerCallbackFunc);
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native nsTimerNameCallbackFunc(nsTimerNameCallbackFunc);
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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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* By default a timer will fire on the thread that created it. Set the .target
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* attribute to fire on a different thread. Once you have set a timer's .target
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* and called one of its init functions, any further interactions with the timer
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* (calling cancel(), changing member fields, etc) should only be done by the
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* target thread, or races may occur with bad results like timers firing after
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* they've been canceled, and/or not firing after re-initiatization.
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*/
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[scriptable, uuid(3de4b105-363c-482c-a409-baac83a01bfc)]
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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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* TYPE_REPEATING_PRECISE is just a synonym for
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* TYPE_REPEATING_PRECISE_CAN_SKIP. They used to be distinct, but the old
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* TYPE_REPEATING_PRECISE kind was similar to TYPE_REPEATING_PRECISE_CAN_SKIP
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* while also being less useful. So the distinction was removed.
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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. This is the only non-slack timer available.
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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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* Like initWithFuncCallback, but also takes a name for the timer; the name
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* will be used when timer profiling is enabled via the "TimerFirings" log
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* module.
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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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* @param aName The timer's name
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*/
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[noscript] void initWithNamedFuncCallback(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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in string aName);
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/**
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* Like initWithNamedFuncCallback, but instead of a timer name it takes a
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* callback that will provide a name when the timer fires.
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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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* @param aNameCallback The callback function
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*/
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[noscript] void initWithNameableFuncCallback(
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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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in nsTimerNameCallbackFunc aNameCallback);
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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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* By default the target is the thread that created the timer.
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*/
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attribute nsIEventTarget target;
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%{C++
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virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const = 0;
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%}
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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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