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/* This file is part of the KDE libraries
Copyright (c) 1999 Preston Brown <pbrown@kde.org>
Copyright (c) 2000-2001 Waldo Bastian <bastian@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef _KUNIQUEAPP_H
#define _KUNIQUEAPP_H
#include <kapplication.h>
#include <dcopobject.h>
class KUniqueApplicationPrivate;
/**
* Maintains only a single
* instance of a running application at a time.
*
* If another instance
* is started, it will determine (via DCOP) whether it is the first instance
* or a second instance. If it is a second instance, it will forward on
* the information to the first instance and then quit.
*
* The .desktop file for the application should state X-DCOP-ServiceType=Unique,
* see kapplication.h
*
* If your application is used to open files, it should also support the --tempfile
* option (see KCmdLineArgs::addTempFileOption()), to delete tempfiles after use.
* Add X-KDE-HasTempFileOption=true to the .desktop file to indicate this.
*
* @see KApplication DCOPObject
* @author Preston Brown <pbrown@kde.org>
*/
class KDECORE_EXPORT KUniqueApplication : public KApplication, public DCOPObject
{
Q_OBJECT
public:
/**
* Constructor. Takes command line arguments from KCmdLineArgs
*
* @param allowStyles Set to false to disable the loading on plugin based
* styles. This is only useful to applications that do not display a GUI
* normally. If you do create an application with @p allowStyles set to false
* it normally runs in the background but under special circumstances
* displays widgets. Call KApplication::enableStyles() before
* displaying any widgets.
* @param GUIenabled Set to false to disable all GUI stuff. This implies
* no styles either.
* @param configUnique If true, the uniqueness of the application will
* depend on the value of the "MultipleInstances"
* key in the "KDE" group of the application config file.
*/
KUniqueApplication( bool allowStyles=true,
bool GUIenabled=true,
bool configUnique=false);
#ifdef Q_WS_X11
/**
* Constructor. Takes command line arguments from KCmdLineArgs
*
* @param display Will be passed to Qt as the X display. The display
* must be valid and already opened.
* @param visual Pointer to the X11 visual that should be used by the
* application. If NULL, the default visual will be used instead.
* @param colormap The colormap that should be used by the application.
* If 0, the default colormap will be used instead.
* @param allowStyles Set to false to disable the loading on plugin based
* styles. This is only useful to applications that do not display a GUI
* normally. If you do create an application with @p allowStyles set to false
* it normally runs in the background but under special circumstances
* displays widgets. Call KApplication::enableStyles() before
* displaying any widgets.
* @param configUnique If true, the uniqueness of the application will
* depend on the value of the "MultipleInstances"
* key in the "KDE" group of the application config file.
* @since KDE 3.3
*/
KUniqueApplication( Display *display,
Qt::HANDLE visual=0,
Qt::HANDLE colormap=0,
bool allowStyles=true,
bool configUnique=false);
#endif
/**
* Adds command line options specific for KUniqueApplication.
*
* Should be called before calling KUniqueApplication constructor
* and / or start().
*/
static void addCmdLineOptions();
/**
* Forks and registers with dcop.
*
* The command line arguments are being sent via DCOP to newInstance()
* and will be received once the application enters the event loop.
*
* Typically this is used like:
* \code
* int main(int argc, char **argv) {
* KAboutData about("myappname", "myAppName", .....);
* KCmdLineArgs::init(argc, argv, &about);
* KCmdLineArgs::addCmdLineOptions( myCmdOptions );
* KUniqueApplication::addCmdLineOptions();
*
* if (!KUniqueApplication::start()) {
* fprintf(stderr, "myAppName is already running!\n");
* exit(0);
* }
* KUniqueApplication a;
* a.exec();
* }
* \endcode
* Note that it's not necessary to call start() explicitly. It will be
* called automatically before creating KUniqueApplication if it hasn't
* been called yet, without any performance impact.
*
* @return true if registration is successful.
* false if another process was already running.
*/
static bool start();
/**
* Destructor
*/
virtual ~KUniqueApplication();
/**
* Dispatches any incoming DCOP message for a new instance.
*
* If it is not a request for a new instance, return false.
* Overloaded from DCOPObject to make sure that the application
* stays unique.
* @param fun DCOP function signature
* @param data the data for the arguments
* @param replyType the type of the reply value
* @param replyData the reply
* @see DCOPObject
*/
bool process(const QCString &fun, const QByteArray &data,
QCString &replyType, QByteArray &replyData);
/**
* Creates a new "instance" of the application.
*
* Usually this will involve making some calls into the GUI portion of your
* application asking for a new window to be created, possibly with
* some data already loaded based on the arguments received.
*
* Command line arguments have been passed to KCmdLineArgs before this
* function is called and can be checked in the usual way.
*
* The default implementation ensures the mainwindow of the already
* running instance is shown and activated if necessary. You should
* prefer using it from your overridden method instead of doing
* it directly.
*
* Note that newInstance() is called also in the first started
* application process.
*
* @return An exit value. The calling process will exit with this value.
*/
virtual int newInstance();
/**
* Returns whether newInstance() is being called while session
* restoration is in progress.
*
* @since KDE 3.3
*/
bool restoringSession();
/**
* @internal
*/
static void setHandleAutoStarted();
private:
/**
* Delays the processing of a DCOP request.
*/
void delayRequest(const QCString &fun, const QByteArray &data);
private slots:
/**
* Delayed processing of DCOP requests.
*/
void processDelayed();
void newInstanceNoFork();
static KInstance* initHack( bool configUnique );
private:
static bool s_nofork;
static bool s_multipleInstances;
static bool s_uniqueTestDone;
static bool s_handleAutoStarted;
protected:
virtual void virtual_hook( int id, void* data );
private:
KUniqueApplicationPrivate *d;
};
#endif
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