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135 lines
7.3 KiB
135 lines
7.3 KiB
14 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/qevent.cpp:1392 -->
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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>QCloseEvent 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">Main Classes</font></a>
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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>QCloseEvent Class Reference</h1>
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<p>The QCloseEvent class contains parameters that describe a close event.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qevent-h.html">qevent.h</a>></tt>
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<p>Inherits <a href="qevent.html">QEvent</a>.
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<p><a href="qcloseevent-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><a href="#QCloseEvent"><b>QCloseEvent</b></a> ()</li>
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<li class=fn>bool <a href="#isAccepted"><b>isAccepted</b></a> () const</li>
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<li class=fn>void <a href="#accept"><b>accept</b></a> ()</li>
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<li class=fn>void <a href="#ignore"><b>ignore</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 QCloseEvent class contains parameters that describe a close event.
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<p>
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<p> Close events are sent to widgets that the user wants to close,
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usually by choosing "Close" from the window menu, or by clicking
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the `X' titlebar button. They are also sent when you call
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<a href="qwidget.html#close">QWidget::close</a>() to close a widget programmatically.
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<p> Close events contain a flag that indicates whether the receiver
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wants the widget to be closed or not. When a widget accepts the
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close event, it is hidden (and destroyed if it was created with
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the <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag). If it refuses to accept the close
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event nothing happens. (Under X11 it is possible that the window
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manager will forcibly close the window; but at the time of writing
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we are not aware of any window manager that does this.)
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<p> The application's main widget -- <a href="qapplication.html#mainWidget">QApplication::mainWidget</a>() --
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is a special case. When it accepts the close event, Qt leaves the
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main event loop and the application is immediately terminated
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(i.e. it returns from the call to <a href="qapplication.html#exec">QApplication::exec</a>() in the
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main() function).
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<p> The event handler <a href="qwidget.html#closeEvent">QWidget::closeEvent</a>() receives close events. The
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default implementation of this event handler accepts the close
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event. If you do not want your widget to be hidden, or want some
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special handing, you should reimplement the event handler.
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<p> The <a href="simple-application.html#closeEvent">closeEvent() in the
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Application Walkthrough</a> shows a close event handler that
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asks whether to save a document before closing.
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<p> If you want the widget to be deleted when it is closed, create it
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with the <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> widget flag. This is very useful for
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independent top-level windows in a multi-window application.
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<p> <a href="qobject.html">QObject</a>s emits the <a href="qobject.html#destroyed">destroyed()</a> signal when they are deleted.
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<p> If the last top-level window is closed, the
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<a href="qapplication.html#lastWindowClosed">QApplication::lastWindowClosed</a>() signal is emitted.
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<p> The <a href="#isAccepted">isAccepted</a>() function returns TRUE if the event's receiver has
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agreed to close the widget; call <a href="#accept">accept</a>() to agree to close the
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widget and call <a href="#ignore">ignore</a>() if the receiver of this event does not
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want the widget to be closed.
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<p> <p>See also <a href="qwidget.html#close">QWidget::close</a>(), <a href="qwidget.html#hide">QWidget::hide</a>(), <a href="qobject.html#destroyed">QObject::destroyed</a>(), <a href="qapplication.html#setMainWidget">QApplication::setMainWidget</a>(), <a href="qapplication.html#lastWindowClosed">QApplication::lastWindowClosed</a>(), <a href="qapplication.html#exec">QApplication::exec</a>(), <a href="qapplication.html#quit">QApplication::quit</a>(), and <a href="events.html">Event Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QCloseEvent"></a>QCloseEvent::QCloseEvent ()
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</h3>
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<p> Constructs a close event object with the accept parameter flag set
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to FALSE.
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<p> <p>See also <a href="#accept">accept</a>().
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<h3 class=fn>void <a name="accept"></a>QCloseEvent::accept ()
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</h3>
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<p> Sets the accept flag of the close event object.
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<p> Setting the accept flag indicates that the receiver of this event
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agrees to close the widget.
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<p> The accept flag is <em>not</em> set by default.
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<p> If you choose to accept in <a href="qwidget.html#closeEvent">QWidget::closeEvent</a>(), the widget will
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be hidden. If the widget's <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag is set, it
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will also be destroyed.
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<p> <p>See also <a href="#ignore">ignore</a>() and <a href="qwidget.html#hide">QWidget::hide</a>().
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<p>Examples: <a href="qaction-application-example.html#x1128">action/application.cpp</a>, <a href="simple-application-example.html#x1545">application/application.cpp</a>, <a href="mdi-example.html#x2021">mdi/application.cpp</a>, <a href="popup-example.html#x1607">popup/popup.cpp</a>, and <a href="qwerty-example.html#x360">qwerty/qwerty.cpp</a>.
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<h3 class=fn>void <a name="ignore"></a>QCloseEvent::ignore ()
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</h3>
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<p> Clears the accept flag of the close event object.
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<p> Clearing the accept flag indicates that the receiver of this event
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does not want the widget to be closed.
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<p> The close event is constructed with the accept flag cleared.
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<p> <p>See also <a href="#accept">accept</a>().
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<p>Examples: <a href="qaction-application-example.html#x1129">action/application.cpp</a>, <a href="simple-application-example.html#x1546">application/application.cpp</a>, <a href="mdi-example.html#x2022">mdi/application.cpp</a>, and <a href="qwerty-example.html#x361">qwerty/qwerty.cpp</a>.
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<h3 class=fn>bool <a name="isAccepted"></a>QCloseEvent::isAccepted () const
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</h3>
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<p> Returns TRUE if the receiver of the event has agreed to close the
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widget; otherwise returns FALSE.
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<p> <p>See also <a href="#accept">accept</a>() and <a href="#ignore">ignore</a>().
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">Qt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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