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117 lines
4.8 KiB
Plaintext
117 lines
4.8 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 the Mozilla browser.
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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) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Stuart Parmenter <pavlov@netscape.com>
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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#include "nsIRunnable.idl"
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/**
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* Interface for the native event system layer. This interface is designed
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* to be used on the main application thread only.
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*/
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[uuid(40bc6280-ad83-471e-b197-80ab90e2065e)]
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interface nsIAppShell : nsISupports
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{
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/**
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* Enter an event loop. Don't leave until exit() is called.
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*/
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void run();
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/**
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* Exit the handle event loop
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*/
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void exit();
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/**
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* Give hint to native event queue notification mechanism. If the native
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* platform needs to tradeoff performance vs. native event starvation this
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* hint tells the native dispatch code which to favor. The default is to
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* prevent native event starvation.
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*
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* Calls to this function may be nested. When the number of calls that pass
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* PR_TRUE is subtracted from the number of calls that pass PR_FALSE is
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* greater than 0, performance is given precedence over preventing event
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* starvation.
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*
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* The starvationDelay arg is only used when favorPerfOverStarvation is
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* PR_FALSE. It is the amount of time in milliseconds to wait before the
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* PR_FALSE actually takes effect.
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*/
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void favorPerformanceHint(in boolean favorPerfOverStarvation,
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in unsigned long starvationDelay);
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/**
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* Suspends the use of additional platform-specific methods (besides the
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* nsIAppShell->run() event loop) to run Gecko events on the main
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* application thread. Under some circumstances these "additional methods"
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* can cause Gecko event handlers to be re-entered, sometimes leading to
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* hangs and crashes. Calls to suspendNative() and resumeNative() may be
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* nested. On some platforms (those that don't use any "additional
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* methods") this will be a no-op. Does not (in itself) stop Gecko events
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* from being processed on the main application thread. But if the
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* nsIAppShell->run() event loop is blocked when this call is made, Gecko
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* events will stop being processed until resumeNative() is called (even
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* if a plugin or library is temporarily processing events on a nested
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* event loop).
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*/
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void suspendNative();
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/**
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* Resumes the use of additional platform-specific methods to run Gecko
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* events on the main application thread. Calls to suspendNative() and
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* resumeNative() may be nested. On some platforms this will be a no-op.
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*/
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void resumeNative();
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/**
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* The current event loop nesting level.
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*/
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readonly attribute unsigned long eventloopNestingLevel;
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/**
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* Allows running of a "synchronous section", in the form of an nsIRunnable
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* once the event loop has reached a "stable state". We've reached a stable
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* state when the currently executing task/event has finished, see:
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* http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#synchronous-section
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* In practice this runs aRunnable once the currently executing event
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* finishes. If called multiple times per task/event, all the runnables will
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* be executed, in the order in which runInStableState() was called.
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*/
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void runInStableState(in nsIRunnable aRunnable);
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};
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