/*! \page qcop.html \title QCop Messages QCop messages allow applications to communicate with each other. These messages are send using QCopEnvelope, and received by connecting to a QCopChannel. The <tt>channelname</tt> of channels within Qtopia all start with "QPE/". The <tt>messagename</tt> is a function identifier followed by a list of types in parentheses. There are no spaces in the message name. The variable names shown in this documentation are purely for information purposes. A message shown as "messageName(Type1 varname1, Type2 varname2, Type2 varname3)" would be used in program code as: \code QCopEnvelope e(channelname, "messageName(Type1,Type2,Type2)"); e << parameter1 << parameter2 << parameter3; \endcode The system-wide channels and messages. <dl> <dt><b>QPE/System</b> <dd> <ul> <li>busy() <br> Causes a wait indicator to be shown to the user. <li>notBusy() <br> Cancels the wait indicator. <li>linkChanged(QString) <br> Sent whenever a link is changed. It is sent by FileManager::saveFile() and others, and received by the Launcher. <li>applyStyle() <br> Sent when user changes style. It is received by QPEApplication and the application will redraw accordingly. <li>quit() <br> Terminates the Qtopia environment. <li>shutdown() <br> Terminates the system. <li>restart() <br> Restarts the Qtopia environment. <li>execute(QString) <br> Executes or raises the given application. <li>execute(QString,QString) <br> Executes or raises the given application, passing an argument. Note that you should consider using the <b>QPE/Application/<i>appname</i></b> channels described below. <li>addAlarm(QDateTime,QCString,QCString,int) <br> Internal. See AlarmServer::addAlarm() <li>deleteAlarm(QDateTime,QCString,QCString,int) <br> Internal. See AlarmServer::deleteAlarm() <li>setDefaultRotation(int) <br> Internal. <li>grabKeyboard(QString) <br> Internal. <li>timeChange(QString) <br> Internal. <li>clockChange(bool) <br> Internal. <li>setScreenSaverInterval(int) <br> Internal. <li>language(QString) <br> Internal. </ul> <dt><b>QPE/Sync</b> <ul> <li>flush() <br> Sent at the start of synchronization. Synchable applications should save any synchable data to disk. <i>Note: this message is currently asynchronous. Stay tuned to discussions regarding synchronization, as this message may become synchronous, requiring slight midification to your code. For now, just respond in a timely fashion, since the sync server merely waits a small time.</i> <li>reload() <br> Sent at the end of synchronization. Synchable applications should reload any synchable data from disk. </ul> <dt><b>QPE/TaskBar</b> <ul> <li>message(QString) <br> Internal. See Global::statusMessage() <li>showInputMethod() <br> Internal. <li>hideInputMethod() <br> Internal. <li>reloadInputMethods() <br> Internal. <li>reloadApplets() <br> Internal. </ul> <dt><b>QPE/Card</b> <ul> <li>stabChanged() <br> Sent when <tt>/var/run/stab</tt>, <tt>/var/state/pcmcia/stab</tt>, or <tt>/var/lib/pcmcia/stab</tt> may have changed. <li>netUp() <br> Sent when a network connection is running. <li>netDown() <br> Sent when a network connection is available, but not running. <li>netUnavailable() <br> Sent when a network connection is not available. </ul> <dt><b>Qt/Tray</b> This channel allows Qt applications (not just Qtopia applications) to show system-tray status in a cross-platform manner, but it is not currently supported. See TaskbarAppletInterface for a more powerful alternative for system tray applications. <ul> <li>popup(int,QPoint) <li>remove(int) <li>setIcon(int,QPixmap) <li>setToolTip(int,QString) <li>doubleClicked(int,QPoint) <li>clicked(int,QPoint) </ul> </dl> Each application listens on a channel called <b>QPE/Application/<i>appname</i></b>, where <b><i>appname</i></b> is the executable name (the application identifier). Standard messages on this channel are: <dl> <dt><b>QPE/Application/<i>appname</i></b> <ul> <li>setDocument(QString) <br>Internal. Causes the setDocument(const QString&) slot of <a href=docwidget.html>the main document widget</a> to be called. <li>nextView() <br>Applications connected to hardware buttons will receive this message if they are already visible. <li>raise() <br>Internal. Causes the the main document widget and the current modal widget to be raised. <li>quit() <br>Internal. Terminates the application. <li>quitIfInvisible() <br>Internal. Terminates the application if it is not shown. </ul> </dl> The QPE/Application/<i>appname</i> channel has a special property: when messages are sent to these channels vie QCopEnvelope, the message is delivered even if the application is not yet running (the application is run and the message is then sent). Applications also respond to messages specific to the application. Such messages in the base Qtopia applications are: <dl> <dt><b>QPE/Application/helpbrowser</b> <ul> <li>showFile(QString <i>file</i>) <br>Send this message to have the Help Browser show a file. The <i>file</i> may be an absolute filename or relative to the system HTML documentation directory ($OPIEDIR/help/html). </ul> <dt><b>QPE/Application/datebook</b> <ul> <li>alarm(QDateTime,int) <br>Internal. Causes the Calendar application to sound alarms. </ul> </dl> */