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347 lines
18 KiB
347 lines
18 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qapplication.cpp:4067 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQSessionManager Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQSessionManager Class Reference</h1>
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<p>The TQSessionManager class provides access to the session manager.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qsessionmanager-h.html">ntqsessionmanager.h</a>></tt>
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<p>Inherits <a href="ntqobject.html">TQObject</a>.
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<p><a href="qsessionmanager-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>TQString <a href="#sessionId"><b>sessionId</b></a> () const</li>
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<li class=fn>TQString <a href="#sessionKey"><b>sessionKey</b></a> () const</li>
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<li class=fn>void * <a href="#handle"><b>handle</b></a> () const</li>
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<li class=fn>bool <a href="#allowsInteraction"><b>allowsInteraction</b></a> ()</li>
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<li class=fn>bool <a href="#allowsErrorInteraction"><b>allowsErrorInteraction</b></a> ()</li>
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<li class=fn>void <a href="#release"><b>release</b></a> ()</li>
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<li class=fn>void <a href="#cancel"><b>cancel</b></a> ()</li>
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<li class=fn>enum <a href="#RestartHint-enum"><b>RestartHint</b></a> { RestartIfRunning, RestartAnyway, RestartImmediately, RestartNever }</li>
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<li class=fn>void <a href="#setRestartHint"><b>setRestartHint</b></a> ( RestartHint hint )</li>
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<li class=fn>RestartHint <a href="#restartHint"><b>restartHint</b></a> () const</li>
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<li class=fn>void <a href="#setRestartCommand"><b>setRestartCommand</b></a> ( const TQStringList & command )</li>
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<li class=fn>TQStringList <a href="#restartCommand"><b>restartCommand</b></a> () const</li>
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<li class=fn>void <a href="#setDiscardCommand"><b>setDiscardCommand</b></a> ( const TQStringList & )</li>
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<li class=fn>TQStringList <a href="#discardCommand"><b>discardCommand</b></a> () const</li>
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<li class=fn>void <a href="#setManagerProperty-2"><b>setManagerProperty</b></a> ( const TQString & name, const TQString & value )</li>
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<li class=fn>void <a href="#setManagerProperty"><b>setManagerProperty</b></a> ( const TQString & name, const TQStringList & value )</li>
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<li class=fn>bool <a href="#isPhase2"><b>isPhase2</b></a> () const</li>
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<li class=fn>void <a href="#requestPhase2"><b>requestPhase2</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQSessionManager class provides access to the session manager.
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<p>
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<p> The session manager is responsible for session management, most
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importantly for interruption and resumption. A "session" is a kind
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of record of the state of the system, e.g. which applications were
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run at start up and which applications are currently running. The
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session manager is used to save the session, e.g. when the machine
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is shut down; and to restore a session, e.g. when the machine is
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started up. Use <a href="ntqsettings.html">TQSettings</a> to save and restore an individual
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application's settings, e.g. window positions, recently used files,
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etc.
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<p> TQSessionManager provides an interface between the application and
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the session manager so that the program can work well with the
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session manager. In TQt, session management requests for action
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are handled by the two virtual functions <a href="ntqapplication.html#commitData">TQApplication::commitData</a>()
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and <a href="ntqapplication.html#saveState">TQApplication::saveState</a>(). Both provide a reference to
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a session manager object as argument, to allow the application
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to communicate with the session manager.
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<p> During a session management action (i.e. within commitData() and
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saveState()), no user interaction is possible <em>unless</em> the
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application got explicit permission from the session manager. You
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ask for permission by calling <a href="#allowsInteraction">allowsInteraction</a>() or, if it's really
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urgent, <a href="#allowsErrorInteraction">allowsErrorInteraction</a>(). TQt does not enforce this, but the
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session manager may.
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<p> You can try to abort the shutdown process by calling <a href="#cancel">cancel</a>(). The
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default commitData() function does this if some top-level window
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rejected its closeEvent().
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<p> For sophisticated session managers provided on Unix/X11, TQSessionManager
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offers further possibilites to fine-tune an application's session
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management behavior: <a href="#setRestartCommand">setRestartCommand</a>(), <a href="#setDiscardCommand">setDiscardCommand</a>(),
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<a href="#setRestartHint">setRestartHint</a>(), <a href="ntqobject.html#setProperty">setProperty</a>(), <a href="#requestPhase2">requestPhase2</a>(). See the respective
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function descriptions for further details.
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<p>See also <a href="application.html">Main Window and Related Classes</a> and <a href="environment.html">Environment Classes</a>.
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<hr><h2>Member Type Documentation</h2>
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<h3 class=fn><a name="RestartHint-enum"></a>TQSessionManager::RestartHint</h3>
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<p> This enum type defines the circumstances under which this
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application wants to be restarted by the session manager. The
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current values are
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<ul>
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<li><tt>TQSessionManager::RestartIfRunning</tt> - if the application is still running when
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the session is shut down, it wants to be restarted at the start of
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the next session.
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<li><tt>TQSessionManager::RestartAnyway</tt> - the application wants to be started at the
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start of the next session, no matter what. (This is useful for
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utilities that run just after startup and then quit.)
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<li><tt>TQSessionManager::RestartImmediately</tt> - the application wants to be started
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immediately whenever it is not running.
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<li><tt>TQSessionManager::RestartNever</tt> - the application does not want to be restarted
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automatically.
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</ul><p> The default hint is <a href="#RestartHint-enum">RestartIfRunning</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn>bool <a name="allowsErrorInteraction"></a>TQSessionManager::allowsErrorInteraction ()
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</h3>
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<p> This is similar to <a href="#allowsInteraction">allowsInteraction</a>(), but also tells the session
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manager that an error occurred. Session managers may give error
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interaction request higher priority, which means that it is more likely
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that an error interaction is permitted. However, you are still not
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guaranteed that the session manager will allow interaction.
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<p> <p>See also <a href="#allowsInteraction">allowsInteraction</a>(), <a href="#release">release</a>(), and <a href="#cancel">cancel</a>().
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<h3 class=fn>bool <a name="allowsInteraction"></a>TQSessionManager::allowsInteraction ()
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</h3>
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<p> Asks the session manager for permission to interact with the
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user. Returns TRUE if interaction is permitted; otherwise
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returns FALSE.
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<p> The rationale behind this mechanism is to make it possible to
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synchronize user interaction during a shutdown. Advanced session
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managers may ask all applications simultaneously to commit their
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data, resulting in a much faster shutdown.
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<p> When the interaction is completed we strongly recommend releasing the
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user interaction semaphore with a call to <a href="#release">release</a>(). This way, other
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applications may get the chance to interact with the user while your
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application is still busy saving data. (The semaphore is implicitly
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released when the application exits.)
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<p> If the user decides to cancel the shutdown process during the
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interaction phase, you must tell the session manager that this has
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happened by calling <a href="#cancel">cancel</a>().
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<p> Here's an example of how an application's <a href="ntqapplication.html#commitData">TQApplication::commitData</a>()
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might be implemented:
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<p> <pre>
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void MyApplication::commitData( TQSessionManager& sm ) {
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if ( sm.<a href="#allowsInteraction">allowsInteraction</a>() ) {
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switch ( TQMessageBox::<a href="ntqmessagebox.html#warning">warning</a>(
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yourMainWindow,
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<a href="ntqobject.html#tr">tr</a>("Application Name"),
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<a href="ntqobject.html#tr">tr</a>("Save changes to document Foo?"),
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<a href="ntqobject.html#tr">tr</a>("&Yes"),
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<a href="ntqobject.html#tr">tr</a>("&No"),
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<a href="ntqobject.html#tr">tr</a>("Cancel"),
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0, 2) ) {
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case 0: // yes
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sm.<a href="#release">release</a>();
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// save document here; if saving fails, call sm.<a href="#cancel">cancel</a>()
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break;
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case 1: // continue without saving
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break;
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default: // cancel
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sm.<a href="#cancel">cancel</a>();
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break;
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}
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} else {
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// we did not get permission to interact, then
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// do something reasonable instead.
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}
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}
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</pre>
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<p> If an error occurred within the application while saving its data,
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you may want to try <a href="#allowsErrorInteraction">allowsErrorInteraction</a>() instead.
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<p> <p>See also <a href="ntqapplication.html#commitData">TQApplication::commitData</a>(), <a href="#release">release</a>(), and <a href="#cancel">cancel</a>().
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13 years ago
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<h3 class=fn>void <a name="cancel"></a>TQSessionManager::cancel ()
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</h3>
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<p> Tells the session manager to cancel the shutdown process. Applications
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should not call this function without first asking the user.
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<p> <p>See also <a href="#allowsInteraction">allowsInteraction</a>() and <a href="#allowsErrorInteraction">allowsErrorInteraction</a>().
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<p>
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<h3 class=fn><a href="ntqstringlist.html">TQStringList</a> <a name="discardCommand"></a>TQSessionManager::discardCommand () const
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</h3>
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<p> Returns the currently set discard command.
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<p> Note that if you want to iterate over the list, you should
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iterate over a copy, e.g.
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<pre>
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<a href="ntqstringlist.html">TQStringList</a> list = mySession.discardCommand();
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TQStringList::Iterator it = list.<a href="ntqvaluelist.html#begin">begin</a>();
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while( it != list.<a href="ntqvaluelist.html#end">end</a>() ) {
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myProcessing( *it );
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++it;
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}
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</pre>
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<p> <p>See also <a href="#setDiscardCommand">setDiscardCommand</a>(), <a href="#restartCommand">restartCommand</a>(), and <a href="#setRestartCommand">setRestartCommand</a>().
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<h3 class=fn>void * <a name="handle"></a>TQSessionManager::handle () const
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</h3>
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<p> X11 only: returns a handle to the current <tt>SmcConnection</tt>.
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<h3 class=fn>bool <a name="isPhase2"></a>TQSessionManager::isPhase2 () const
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</h3>
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<p> Returns TRUE if the session manager is currently performing a second
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session management phase; otherwise returns FALSE.
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<p> <p>See also <a href="#requestPhase2">requestPhase2</a>().
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<h3 class=fn>void <a name="release"></a>TQSessionManager::release ()
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</h3>
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<p> Releases the session manager's interaction semaphore after an
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interaction phase.
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<p> <p>See also <a href="#allowsInteraction">allowsInteraction</a>() and <a href="#allowsErrorInteraction">allowsErrorInteraction</a>().
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<h3 class=fn>void <a name="requestPhase2"></a>TQSessionManager::requestPhase2 ()
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</h3>
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<p> Requests a second session management phase for the application. The
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application may then return immediately from the
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<a href="ntqapplication.html#commitData">TQApplication::commitData</a>() or <a href="ntqapplication.html#saveState">TQApplication::saveState</a>() function,
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and they will be called again once most or all other applications have
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finished their session management.
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<p> The two phases are useful for applications such as the X11 window manager
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that need to store information about another application's windows
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and therefore have to wait until these applications have completed their
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respective session management tasks.
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<p> Note that if another application has requested a second phase it
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may get called before, simultaneously with, or after your
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application's second phase.
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<p> <p>See also <a href="#isPhase2">isPhase2</a>().
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<h3 class=fn><a href="ntqstringlist.html">TQStringList</a> <a name="restartCommand"></a>TQSessionManager::restartCommand () const
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13 years ago
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</h3>
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<p> Returns the currently set restart command.
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<p> Note that if you want to iterate over the list, you should
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iterate over a copy, e.g.
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<pre>
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<a href="ntqstringlist.html">TQStringList</a> list = mySession.restartCommand();
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TQStringList::Iterator it = list.<a href="ntqvaluelist.html#begin">begin</a>();
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while( it != list.<a href="ntqvaluelist.html#end">end</a>() ) {
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myProcessing( *it );
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++it;
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}
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</pre>
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<p> <p>See also <a href="#setRestartCommand">setRestartCommand</a>() and <a href="#restartHint">restartHint</a>().
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<h3 class=fn><a href="ntqsessionmanager.html#RestartHint-enum">RestartHint</a> <a name="restartHint"></a>TQSessionManager::restartHint () const
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</h3>
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<p> Returns the application's current restart hint. The default is
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<a href="#RestartHint-enum">RestartIfRunning</a>.
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<p> <p>See also <a href="#setRestartHint">setRestartHint</a>().
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="sessionId"></a>TQSessionManager::sessionId () const
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</h3>
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<p> Returns the identifier of the current session.
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<p> If the application has been restored from an earlier session, this
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identifier is the same as it was in that earlier session.
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13 years ago
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<p> <p>See also <a href="#sessionKey">sessionKey</a>() and <a href="ntqapplication.html#sessionId">TQApplication::sessionId</a>().
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13 years ago
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13 years ago
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="sessionKey"></a>TQSessionManager::sessionKey () const
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13 years ago
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</h3>
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<p> Returns the session key in the current session.
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<p> If the application has been restored from an earlier session, this
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key is the same as it was when the previous session ended.
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<p> The session key changes with every call of commitData() or
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saveState().
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13 years ago
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<p> <p>See also <a href="#sessionId">sessionId</a>() and <a href="ntqapplication.html#sessionKey">TQApplication::sessionKey</a>().
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13 years ago
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||
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13 years ago
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<h3 class=fn>void <a name="setDiscardCommand"></a>TQSessionManager::setDiscardCommand ( const <a href="ntqstringlist.html">TQStringList</a> & )
|
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13 years ago
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</h3>
|
||
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|
||
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<p> <p>See also <a href="#discardCommand">discardCommand</a>() and <a href="#setRestartCommand">setRestartCommand</a>().
|
||
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|
||
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13 years ago
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<h3 class=fn>void <a name="setManagerProperty"></a>TQSessionManager::setManagerProperty ( const <a href="ntqstring.html">TQString</a> & name, const <a href="ntqstringlist.html">TQStringList</a> & value )
|
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13 years ago
|
</h3>
|
||
|
|
|
||
|
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<p> Low-level write access to the application's identification and state
|
||
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record are kept in the session manager.
|
||
|
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<p> The property called <em>name</em> has its value set to the string list <em>value</em>.
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>void <a name="setManagerProperty-2"></a>TQSessionManager::setManagerProperty ( const <a href="ntqstring.html">TQString</a> & name, const <a href="ntqstring.html">TQString</a> & value )
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Low-level write access to the application's identification and state
|
||
|
|
records are kept in the session manager.
|
||
|
|
<p> The property called <em>name</em> has its value set to the string <em>value</em>.
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>void <a name="setRestartCommand"></a>TQSessionManager::setRestartCommand ( const <a href="ntqstringlist.html">TQStringList</a> & command )
|
||
|
13 years ago
|
</h3>
|
||
|
|
|
||
|
|
<p> If the session manager is capable of restoring sessions it will
|
||
|
|
execute <em>command</em> in order to restore the application. The command
|
||
|
|
defaults to
|
||
|
|
<p> <pre>
|
||
|
|
appname -session id
|
||
|
|
</pre>
|
||
|
|
|
||
|
13 years ago
|
<p> The <tt>-session</tt> option is mandatory; otherwise <a href="ntqapplication.html">TQApplication</a> cannot
|
||
|
13 years ago
|
tell whether it has been restored or what the current session
|
||
|
13 years ago
|
identifier is. See <a href="ntqapplication.html#isSessionRestored">TQApplication::isSessionRestored</a>() and
|
||
|
|
<a href="ntqapplication.html#sessionId">TQApplication::sessionId</a>() for details.
|
||
|
13 years ago
|
<p> If your application is very simple, it may be possible to store the
|
||
|
|
entire application state in additional command line options. This
|
||
|
|
is usually a very bad idea because command lines are often limited
|
||
|
13 years ago
|
to a few hundred bytes. Instead, use <a href="ntqsettings.html">TQSettings</a>, or temporary files
|
||
|
13 years ago
|
or a database for this purpose. By marking the data with the unique
|
||
|
|
<a href="#sessionId">sessionId</a>(), you will be able to restore the application in a future
|
||
|
|
session.
|
||
|
|
<p> <p>See also <a href="#restartCommand">restartCommand</a>(), <a href="#setDiscardCommand">setDiscardCommand</a>(), and <a href="#setRestartHint">setRestartHint</a>().
|
||
|
|
|
||
|
13 years ago
|
<h3 class=fn>void <a name="setRestartHint"></a>TQSessionManager::setRestartHint ( <a href="ntqsessionmanager.html#RestartHint-enum">RestartHint</a> hint )
|
||
|
13 years ago
|
</h3>
|
||
|
|
|
||
|
|
<p> Sets the application's restart hint to <em>hint</em>. On application
|
||
|
|
startup the hint is set to <a href="#RestartHint-enum">RestartIfRunning</a>.
|
||
|
|
<p> Note that these flags are only hints, a session manager may or may
|
||
|
|
not respect them.
|
||
|
13 years ago
|
<p> We recommend setting the restart hint in <a href="ntqapplication.html#saveState">TQApplication::saveState</a>()
|
||
|
13 years ago
|
because most session managers perform a checkpoint shortly after an
|
||
|
|
application's startup.
|
||
|
|
<p> <p>See also <a href="#restartHint">restartHint</a>().
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">TQt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|