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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QSessionManager Class Reference</h1>
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| 33 |
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| 34 | <p>The QSessionManager class provides access to the session manager.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qsessionmanager-h.html">qsessionmanager.h</a>></tt>
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| 37 | <p>Inherits <a href="qobject.html">QObject</a>.
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| 38 | <p><a href="qsessionmanager-members.html">List of all member functions.</a>
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| 39 | <h2>Public Members</h2>
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| 40 | <ul>
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| 41 | <li class=fn>QString <a href="#sessionId"><b>sessionId</b></a> () const</li>
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| 42 | <li class=fn>QString <a href="#sessionKey"><b>sessionKey</b></a> () const</li>
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| 43 | <li class=fn>void * <a href="#handle"><b>handle</b></a> () const</li>
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| 44 | <li class=fn>bool <a href="#allowsInteraction"><b>allowsInteraction</b></a> ()</li>
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| 45 | <li class=fn>bool <a href="#allowsErrorInteraction"><b>allowsErrorInteraction</b></a> ()</li>
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| 46 | <li class=fn>void <a href="#release"><b>release</b></a> ()</li>
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| 47 | <li class=fn>void <a href="#cancel"><b>cancel</b></a> ()</li>
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| 48 | <li class=fn>enum <a href="#RestartHint-enum"><b>RestartHint</b></a> { RestartIfRunning, RestartAnyway, RestartImmediately, RestartNever }</li>
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| 49 | <li class=fn>void <a href="#setRestartHint"><b>setRestartHint</b></a> ( RestartHint hint )</li>
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| 50 | <li class=fn>RestartHint <a href="#restartHint"><b>restartHint</b></a> () const</li>
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| 51 | <li class=fn>void <a href="#setRestartCommand"><b>setRestartCommand</b></a> ( const QStringList & command )</li>
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| 52 | <li class=fn>QStringList <a href="#restartCommand"><b>restartCommand</b></a> () const</li>
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| 53 | <li class=fn>void <a href="#setDiscardCommand"><b>setDiscardCommand</b></a> ( const QStringList & )</li>
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| 54 | <li class=fn>QStringList <a href="#discardCommand"><b>discardCommand</b></a> () const</li>
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| 55 | <li class=fn>void <a href="#setManagerProperty-2"><b>setManagerProperty</b></a> ( const QString & name, const QString & value )</li>
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| 56 | <li class=fn>void <a href="#setManagerProperty"><b>setManagerProperty</b></a> ( const QString & name, const QStringList & value )</li>
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| 57 | <li class=fn>bool <a href="#isPhase2"><b>isPhase2</b></a> () const</li>
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| 58 | <li class=fn>void <a href="#requestPhase2"><b>requestPhase2</b></a> ()</li>
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| 59 | </ul>
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| 60 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 61 |
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| 62 |
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| 63 | The QSessionManager class provides access to the session manager.
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| 64 | <p>
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| 65 |
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| 66 | <p> The session manager is responsible for session management, most
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| 67 | importantly for interruption and resumption. A "session" is a kind
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| 68 | of record of the state of the system, e.g. which applications were
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| 69 | run at start up and which applications are currently running. The
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| 70 | session manager is used to save the session, e.g. when the machine
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| 71 | is shut down; and to restore a session, e.g. when the machine is
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| 72 | started up. Use <a href="qsettings.html">QSettings</a> to save and restore an individual
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| 73 | application's settings, e.g. window positions, recently used files,
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| 74 | etc.
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| 75 | <p> QSessionManager provides an interface between the application and
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| 76 | the session manager so that the program can work well with the
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| 77 | session manager. In Qt, session management requests for action
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| 78 | are handled by the two virtual functions <a href="qapplication.html#commitData">QApplication::commitData</a>()
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| 79 | and <a href="qapplication.html#saveState">QApplication::saveState</a>(). Both provide a reference to
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| 80 | a session manager object as argument, to allow the application
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| 81 | to communicate with the session manager.
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| 82 | <p> During a session management action (i.e. within commitData() and
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| 83 | saveState()), no user interaction is possible <em>unless</em> the
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| 84 | application got explicit permission from the session manager. You
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| 85 | ask for permission by calling <a href="#allowsInteraction">allowsInteraction</a>() or, if it's really
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| 86 | urgent, <a href="#allowsErrorInteraction">allowsErrorInteraction</a>(). Qt does not enforce this, but the
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| 87 | session manager may.
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| 88 | <p> You can try to abort the shutdown process by calling <a href="#cancel">cancel</a>(). The
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| 89 | default commitData() function does this if some top-level window
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| 90 | rejected its closeEvent().
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| 91 | <p> For sophisticated session managers provided on Unix/X11, QSessionManager
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| 92 | offers further possibilites to fine-tune an application's session
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| 93 | management behavior: <a href="#setRestartCommand">setRestartCommand</a>(), <a href="#setDiscardCommand">setDiscardCommand</a>(),
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| 94 | <a href="#setRestartHint">setRestartHint</a>(), <a href="qobject.html#setProperty">setProperty</a>(), <a href="#requestPhase2">requestPhase2</a>(). See the respective
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| 95 | function descriptions for further details.
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| 96 | <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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| 97 |
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| 98 | <hr><h2>Member Type Documentation</h2>
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| 99 | <h3 class=fn><a name="RestartHint-enum"></a>QSessionManager::RestartHint</h3>
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| 100 | <p> This enum type defines the circumstances under which this
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| 101 | application wants to be restarted by the session manager. The
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| 102 | current values are
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| 103 | <ul>
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| 104 | <li><tt>QSessionManager::RestartIfRunning</tt> - if the application is still running when
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| 105 | the session is shut down, it wants to be restarted at the start of
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| 106 | the next session.
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| 107 | <li><tt>QSessionManager::RestartAnyway</tt> - the application wants to be started at the
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| 108 | start of the next session, no matter what. (This is useful for
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| 109 | utilities that run just after startup and then quit.)
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| 110 | <li><tt>QSessionManager::RestartImmediately</tt> - the application wants to be started
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| 111 | immediately whenever it is not running.
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| 112 | <li><tt>QSessionManager::RestartNever</tt> - the application does not want to be restarted
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| 113 | automatically.
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| 114 | </ul><p> The default hint is <a href="#RestartHint-enum">RestartIfRunning</a>.
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| 115 |
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| 116 | <hr><h2>Member Function Documentation</h2>
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| 117 | <h3 class=fn>bool <a name="allowsErrorInteraction"></a>QSessionManager::allowsErrorInteraction ()
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| 118 | </h3>
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| 119 |
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| 120 | <p> This is similar to <a href="#allowsInteraction">allowsInteraction</a>(), but also tells the session
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| 121 | manager that an error occurred. Session managers may give error
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| 122 | interaction request higher priority, which means that it is more likely
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| 123 | that an error interaction is permitted. However, you are still not
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| 124 | guaranteed that the session manager will allow interaction.
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| 125 | <p> <p>See also <a href="#allowsInteraction">allowsInteraction</a>(), <a href="#release">release</a>(), and <a href="#cancel">cancel</a>().
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| 126 |
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| 127 | <h3 class=fn>bool <a name="allowsInteraction"></a>QSessionManager::allowsInteraction ()
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| 128 | </h3>
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| 129 |
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| 130 | <p> Asks the session manager for permission to interact with the
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| 131 | user. Returns TRUE if interaction is permitted; otherwise
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| 132 | returns FALSE.
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| 133 | <p> The rationale behind this mechanism is to make it possible to
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| 134 | synchronize user interaction during a shutdown. Advanced session
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| 135 | managers may ask all applications simultaneously to commit their
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| 136 | data, resulting in a much faster shutdown.
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| 137 | <p> When the interaction is completed we strongly recommend releasing the
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| 138 | user interaction semaphore with a call to <a href="#release">release</a>(). This way, other
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| 139 | applications may get the chance to interact with the user while your
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| 140 | application is still busy saving data. (The semaphore is implicitly
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| 141 | released when the application exits.)
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| 142 | <p> If the user decides to cancel the shutdown process during the
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| 143 | interaction phase, you must tell the session manager that this has
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| 144 | happened by calling <a href="#cancel">cancel</a>().
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| 145 | <p> Here's an example of how an application's <a href="qapplication.html#commitData">QApplication::commitData</a>()
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| 146 | might be implemented:
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| 147 | <p> <pre>
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| 148 | void MyApplication::commitData( QSessionManager& sm ) {
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| 149 | if ( sm.<a href="#allowsInteraction">allowsInteraction</a>() ) {
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| 150 | switch ( QMessageBox::<a href="qmessagebox.html#warning">warning</a>(
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| 151 | yourMainWindow,
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| 152 | <a href="qobject.html#tr">tr</a>("Application Name"),
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| 153 | <a href="qobject.html#tr">tr</a>("Save changes to document Foo?"),
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| 154 | <a href="qobject.html#tr">tr</a>("&Yes"),
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| 155 | <a href="qobject.html#tr">tr</a>("&No"),
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| 156 | <a href="qobject.html#tr">tr</a>("Cancel"),
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| 157 | 0, 2) ) {
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| 158 | case 0: // yes
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| 159 | sm.<a href="#release">release</a>();
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| 160 | // save document here; if saving fails, call sm.<a href="#cancel">cancel</a>()
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| 161 | break;
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| 162 | case 1: // continue without saving
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| 163 | break;
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| 164 | default: // cancel
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| 165 | sm.<a href="#cancel">cancel</a>();
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| 166 | break;
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| 167 | }
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| 168 | } else {
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| 169 | // we did not get permission to interact, then
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| 170 | // do something reasonable instead.
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| 171 | }
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| 172 | }
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| 173 | </pre>
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| 174 |
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| 175 | <p> If an error occurred within the application while saving its data,
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| 176 | you may want to try <a href="#allowsErrorInteraction">allowsErrorInteraction</a>() instead.
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| 177 | <p> <p>See also <a href="qapplication.html#commitData">QApplication::commitData</a>(), <a href="#release">release</a>(), and <a href="#cancel">cancel</a>().
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| 178 |
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| 179 | <h3 class=fn>void <a name="cancel"></a>QSessionManager::cancel ()
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| 180 | </h3>
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| 181 |
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| 182 | <p> Tells the session manager to cancel the shutdown process. Applications
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| 183 | should not call this function without first asking the user.
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| 184 | <p> <p>See also <a href="#allowsInteraction">allowsInteraction</a>() and <a href="#allowsErrorInteraction">allowsErrorInteraction</a>().
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| 185 |
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| 186 | <p>
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| 187 | <h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="discardCommand"></a>QSessionManager::discardCommand () const
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| 188 | </h3>
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| 189 |
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| 190 | <p> Returns the currently set discard command.
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| 191 | <p> Note that if you want to iterate over the list, you should
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| 192 | iterate over a copy, e.g.
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| 193 | <pre>
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| 194 | <a href="qstringlist.html">QStringList</a> list = mySession.discardCommand();
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| 195 | QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
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| 196 | while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
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| 197 | myProcessing( *it );
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| 198 | ++it;
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| 199 | }
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| 200 | </pre>
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| 201 |
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| 202 | <p> <p>See also <a href="#setDiscardCommand">setDiscardCommand</a>(), <a href="#restartCommand">restartCommand</a>(), and <a href="#setRestartCommand">setRestartCommand</a>().
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| 203 |
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| 204 | <h3 class=fn>void * <a name="handle"></a>QSessionManager::handle () const
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| 205 | </h3>
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| 206 |
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| 207 | <p> X11 only: returns a handle to the current <tt>SmcConnection</tt>.
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| 208 |
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| 209 | <h3 class=fn>bool <a name="isPhase2"></a>QSessionManager::isPhase2 () const
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| 210 | </h3>
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| 211 |
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| 212 | <p> Returns TRUE if the session manager is currently performing a second
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| 213 | session management phase; otherwise returns FALSE.
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| 214 | <p> <p>See also <a href="#requestPhase2">requestPhase2</a>().
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| 215 |
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| 216 | <h3 class=fn>void <a name="release"></a>QSessionManager::release ()
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| 217 | </h3>
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| 218 |
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| 219 | <p> Releases the session manager's interaction semaphore after an
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| 220 | interaction phase.
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| 221 | <p> <p>See also <a href="#allowsInteraction">allowsInteraction</a>() and <a href="#allowsErrorInteraction">allowsErrorInteraction</a>().
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| 222 |
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| 223 | <h3 class=fn>void <a name="requestPhase2"></a>QSessionManager::requestPhase2 ()
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| 224 | </h3>
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| 225 |
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| 226 | <p> Requests a second session management phase for the application. The
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| 227 | application may then return immediately from the
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| 228 | <a href="qapplication.html#commitData">QApplication::commitData</a>() or <a href="qapplication.html#saveState">QApplication::saveState</a>() function,
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| 229 | and they will be called again once most or all other applications have
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| 230 | finished their session management.
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| 231 | <p> The two phases are useful for applications such as the X11 window manager
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| 232 | that need to store information about another application's windows
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| 233 | and therefore have to wait until these applications have completed their
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| 234 | respective session management tasks.
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| 235 | <p> Note that if another application has requested a second phase it
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| 236 | may get called before, simultaneously with, or after your
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| 237 | application's second phase.
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| 238 | <p> <p>See also <a href="#isPhase2">isPhase2</a>().
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| 239 |
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| 240 | <h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="restartCommand"></a>QSessionManager::restartCommand () const
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| 241 | </h3>
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| 242 |
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| 243 | <p> Returns the currently set restart command.
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| 244 | <p> Note that if you want to iterate over the list, you should
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| 245 | iterate over a copy, e.g.
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| 246 | <pre>
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| 247 | <a href="qstringlist.html">QStringList</a> list = mySession.restartCommand();
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| 248 | QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
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| 249 | while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
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| 250 | myProcessing( *it );
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| 251 | ++it;
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| 252 | }
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| 253 | </pre>
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| 254 |
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| 255 | <p> <p>See also <a href="#setRestartCommand">setRestartCommand</a>() and <a href="#restartHint">restartHint</a>().
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| 256 |
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| 257 | <h3 class=fn><a href="qsessionmanager.html#RestartHint-enum">RestartHint</a> <a name="restartHint"></a>QSessionManager::restartHint () const
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| 258 | </h3>
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| 259 |
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| 260 | <p> Returns the application's current restart hint. The default is
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| 261 | <a href="#RestartHint-enum">RestartIfRunning</a>.
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| 262 | <p> <p>See also <a href="#setRestartHint">setRestartHint</a>().
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| 263 |
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| 264 | <h3 class=fn><a href="qstring.html">QString</a> <a name="sessionId"></a>QSessionManager::sessionId () const
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| 265 | </h3>
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| 266 |
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| 267 | <p> Returns the identifier of the current session.
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| 268 | <p> If the application has been restored from an earlier session, this
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| 269 | identifier is the same as it was in that earlier session.
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| 270 | <p> <p>See also <a href="#sessionKey">sessionKey</a>() and <a href="qapplication.html#sessionId">QApplication::sessionId</a>().
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| 271 |
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| 272 | <h3 class=fn><a href="qstring.html">QString</a> <a name="sessionKey"></a>QSessionManager::sessionKey () const
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| 273 | </h3>
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| 274 |
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| 275 | <p> Returns the session key in the current session.
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| 276 | <p> If the application has been restored from an earlier session, this
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| 277 | key is the same as it was when the previous session ended.
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| 278 | <p> The session key changes with every call of commitData() or
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| 279 | saveState().
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| 280 | <p> <p>See also <a href="#sessionId">sessionId</a>() and <a href="qapplication.html#sessionKey">QApplication::sessionKey</a>().
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| 281 |
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| 282 | <h3 class=fn>void <a name="setDiscardCommand"></a>QSessionManager::setDiscardCommand ( const <a href="qstringlist.html">QStringList</a> & )
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| 283 | </h3>
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| 284 |
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| 285 | <p> <p>See also <a href="#discardCommand">discardCommand</a>() and <a href="#setRestartCommand">setRestartCommand</a>().
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| 286 |
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| 287 | <h3 class=fn>void <a name="setManagerProperty"></a>QSessionManager::setManagerProperty ( const <a href="qstring.html">QString</a> & name, const <a href="qstringlist.html">QStringList</a> & value )
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| 288 | </h3>
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| 289 |
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| 290 | <p> Low-level write access to the application's identification and state
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| 291 | record are kept in the session manager.
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| 292 | <p> The property called <em>name</em> has its value set to the string list <em>value</em>.
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| 293 |
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| 294 | <h3 class=fn>void <a name="setManagerProperty-2"></a>QSessionManager::setManagerProperty ( const <a href="qstring.html">QString</a> & name, const <a href="qstring.html">QString</a> & value )
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| 295 | </h3>
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| 296 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 297 | <p> Low-level write access to the application's identification and state
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| 298 | records are kept in the session manager.
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| 299 | <p> The property called <em>name</em> has its value set to the string <em>value</em>.
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| 300 |
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| 301 | <h3 class=fn>void <a name="setRestartCommand"></a>QSessionManager::setRestartCommand ( const <a href="qstringlist.html">QStringList</a> & command )
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| 302 | </h3>
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| 303 |
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| 304 | <p> If the session manager is capable of restoring sessions it will
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| 305 | execute <em>command</em> in order to restore the application. The command
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| 306 | defaults to
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| 307 | <p> <pre>
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| 308 | appname -session id
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| 309 | </pre>
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| 310 |
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| 311 | <p> The <tt>-session</tt> option is mandatory; otherwise <a href="qapplication.html">QApplication</a> cannot
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| 312 | tell whether it has been restored or what the current session
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| 313 | identifier is. See <a href="qapplication.html#isSessionRestored">QApplication::isSessionRestored</a>() and
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| 314 | <a href="qapplication.html#sessionId">QApplication::sessionId</a>() for details.
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| 315 | <p> If your application is very simple, it may be possible to store the
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| 316 | entire application state in additional command line options. This
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| 317 | is usually a very bad idea because command lines are often limited
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| 318 | to a few hundred bytes. Instead, use <a href="qsettings.html">QSettings</a>, or temporary files
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| 319 | or a database for this purpose. By marking the data with the unique
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| 320 | <a href="#sessionId">sessionId</a>(), you will be able to restore the application in a future
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| 321 | session.
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| 322 | <p> <p>See also <a href="#restartCommand">restartCommand</a>(), <a href="#setDiscardCommand">setDiscardCommand</a>(), and <a href="#setRestartHint">setRestartHint</a>().
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| 323 |
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| 324 | <h3 class=fn>void <a name="setRestartHint"></a>QSessionManager::setRestartHint ( <a href="qsessionmanager.html#RestartHint-enum">RestartHint</a> hint )
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| 325 | </h3>
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| 326 |
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| 327 | <p> Sets the application's restart hint to <em>hint</em>. On application
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| 328 | startup the hint is set to <a href="#RestartHint-enum">RestartIfRunning</a>.
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| 329 | <p> Note that these flags are only hints, a session manager may or may
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| 330 | not respect them.
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| 331 | <p> We recommend setting the restart hint in <a href="qapplication.html#saveState">QApplication::saveState</a>()
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| 332 | because most session managers perform a checkpoint shortly after an
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| 333 | application's startup.
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| 334 | <p> <p>See also <a href="#restartHint">restartHint</a>().
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| 335 |
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| 336 | <!-- eof -->
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| 337 | <hr><p>
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| 338 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 339 | Copyright © 1995-2007
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| 340 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 341 | <table width=100% cellspacing=0 border=0><tr>
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| 342 | <td>Copyright © 2007
|
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| 343 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 344 | <td align=right><div align=right>Qt 3.3.8</div>
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| 345 | </table></div></address></body>
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| 346 | </html>
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