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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/src/kernel/qevent.cpp:1318 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>QCloseEvent Class</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><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><p>The QCloseEvent class contains parameters that describe a close event.<a href="#details">More...</a><p><tt>#include <<a href="qevent-h.html">qevent.h</a>></tt><p>Inherits <a href="qevent.html">QEvent</a>.<p><a href="qcloseevent-members.html">List of all member functions.</a><h2>Public Members</h2><ul><li><div class=fn><a href="#QCloseEvent"><b>QCloseEvent</b></a> ()</div></li><li><div class=fn>bool <a href="#isAccepted"><b>isAccepted</b></a> () const</div></li><li><div class=fn>void <a href="#accept"><b>accept</b></a> ()</div></li><li><div class=fn>void <a href="#ignore"><b>ignore</b></a> ()</div></li></ul><hr><a name="details"></a><h2>Detailed Description</h2>The QCloseEvent class contains parameters that describe a close event.<p> <p> Close events are sent to widgets that the user wants to close,usually by choosing "Close" from the window menu, or by clickingthe `X' titlebar button. They are also sent when you call<a href="qwidget.html#close">QWidget::close</a>() to close a widget programmatically.<p> Close events contain a flag that indicates whether the receiverwants the widget to be closed or not. When a widget accepts theclose event, it is hidden (and destroyed if it was created withthe <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag). If it refuses to accept the closeevent nothing happens. (Under X11 it is possible that the windowmanager will forcibly close the window; but at the time of writingwe are not aware of any window manager that does this.)<p> The application's main widget -- <a href="qapplication.html#mainWidget">QApplication::mainWidget</a>() --is a special case. When it accepts the close event, Qt leaves themain event loop and the application is immediately terminated(i.e. it returns from the call to <a href="qapplication.html#exec">QApplication::exec</a>() in themain() function).<p> The event handler <a href="qwidget.html#closeEvent">QWidget::closeEvent</a>() receives close events. Thedefault implementation of this event handler accepts the closeevent. If you do not want your widget to be hidden, or want somespecial handing, you should reimplement the event handler.<p> The <a href="simple-application.html#closeEvent">closeEvent() in the Application Walkthrough</a> shows a close event handler thatasks whether to save a document before closing.<p> If you want the widget to be deleted when it is closed, create itwith the <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> widget flag. This is very useful forindependent top-level windows in a multi-window application.<p> <a href="qobject.html">QObject</a>s emits the <a href="qobject.html#destroyed">destroyed()</a> signal when they are deleted.<p> If the last top-level window is closed, the<a href="qapplication.html#lastWindowClosed">QApplication::lastWindowClosed</a>() signal is emitted.<p> The <a href="#isAccepted">isAccepted</a>() function returns TRUE if the event's receiver hasagreed to close the widget; call <a href="#accept">accept</a>() to agree to close thewidget and call <a href="#ignore">ignore</a>() if the receiver of this event does notwant the widget to be closed.<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>.<hr><h2>Member Function Documentation</h2><h3 class=fn><a name="QCloseEvent"></a>QCloseEvent::QCloseEvent ()</h3><p> Constructs a close event object with the accept parameter flag setto FALSE.<p> <p>See also <a href="#accept">accept</a>().<h3 class=fn>void <a name="accept"></a>QCloseEvent::accept ()</h3><p> Sets the accept flag of the close event object.<p> Setting the accept flag indicates that the receiver of this eventagrees to close the widget.<p> The accept flag is <em>not</em> set by default.<p> If you choose to accept in <a href="qwidget.html#closeEvent">QWidget::closeEvent</a>(), the widget willbe hidden. If the widget's <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag is set, itwill also be destroyed.<p> <p>See also <a href="#ignore">ignore</a>() and <a href="qwidget.html#hide">QWidget::hide</a>().<p>Examples: <a href="qaction-application-example.html#x1064">action/application.cpp</a>, <a href="simple-application-example.html#x1508">application/application.cpp</a>, <a href="popup-example.html#x1573">popup/popup.cpp</a> and <a href="qwerty-example.html#x358">qwerty/qwerty.cpp</a>.<h3 class=fn>void <a name="ignore"></a>QCloseEvent::ignore ()</h3><p> Clears the accept flag of the close event object.<p> Clearing the accept flag indicates that the receiver of this eventdoes not want the widget to be closed.<p> The close event is constructed with the accept flag cleared.<p> <p>See also <a href="#accept">accept</a>().<p>Examples: <a href="qaction-application-example.html#x1065">action/application.cpp</a>, <a href="simple-application-example.html#x1509">application/application.cpp</a> and <a href="qwerty-example.html#x359">qwerty/qwerty.cpp</a>.<h3 class=fn>bool <a name="isAccepted"></a>QCloseEvent::isAccepted () const</h3><p> Returns TRUE if the receiver of the event has agreed to close thewidget; otherwise returns FALSE.<p> <p>See also <a href="#accept">accept</a>() and <a href="#ignore">ignore</a>().<!-- eof --><hr><p>This file is part of the <a href="index.html">Qt toolkit</a>.Copyright © 1995-2002<a href="http://www.trolltech.com/">Trolltech</a>. 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