source: trunk/doc/html/qcloseevent.html@ 203

Last change on this file since 203 was 190, checked in by rudi, 14 years ago

reference documentation added
File size: 7.4 KB
Line 
1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qevent.cpp:1392 -->
3<html>
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>QCloseEvent Class</title>
7<style type="text/css"><!--
8fn { margin-left: 1cm; text-indent: -1cm; }
9a:link { color: #004faf; text-decoration: none }
10a:visited { color: #672967; text-decoration: none }
11body { background: #ffffff; color: black; }
12--></style>
13</head>
14<body>
15
16<table border="0" cellpadding="0" cellspacing="0" width="100%">
17<tr bgcolor="#E5E5E5">
18<td valign=center>
19 <a href="index.html">
20<font color="#004faf">Home</font></a>
21 | <a href="classes.html">
22<font color="#004faf">All&nbsp;Classes</font></a>
23 | <a href="mainclasses.html">
24<font color="#004faf">Main&nbsp;Classes</font></a>
25 | <a href="annotated.html">
26<font color="#004faf">Annotated</font></a>
27 | <a href="groups.html">
28<font color="#004faf">Grouped&nbsp;Classes</font></a>
29 | <a href="functions.html">
30<font color="#004faf">Functions</font></a>
31</td>
32<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>
33
34<p>The QCloseEvent class contains parameters that describe a close event.
35<a href="#details">More...</a>
36<p><tt>#include &lt;<a href="qevent-h.html">qevent.h</a>&gt;</tt>
37<p>Inherits <a href="qevent.html">QEvent</a>.
38<p><a href="qcloseevent-members.html">List of all member functions.</a>
39<h2>Public Members</h2>
40<ul>
41<li class=fn><a href="#QCloseEvent"><b>QCloseEvent</b></a> ()</li>
42<li class=fn>bool <a href="#isAccepted"><b>isAccepted</b></a> () const</li>
43<li class=fn>void <a href="#accept"><b>accept</b></a> ()</li>
44<li class=fn>void <a href="#ignore"><b>ignore</b></a> ()</li>
45</ul>
46<hr><a name="details"></a><h2>Detailed Description</h2>
47
48
49The QCloseEvent class contains parameters that describe a close event.
50<p>
51<p> Close events are sent to widgets that the user wants to close,
52usually by choosing "Close" from the window menu, or by clicking
53the `X' titlebar button. They are also sent when you call
54<a href="qwidget.html#close">QWidget::close</a>() to close a widget programmatically.
55<p> Close events contain a flag that indicates whether the receiver
56wants the widget to be closed or not. When a widget accepts the
57close event, it is hidden (and destroyed if it was created with
58the <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag). If it refuses to accept the close
59event nothing happens. (Under X11 it is possible that the window
60manager will forcibly close the window; but at the time of writing
61we are not aware of any window manager that does this.)
62<p> The application's main widget -- <a href="qapplication.html#mainWidget">QApplication::mainWidget</a>() --
63is a special case. When it accepts the close event, Qt leaves the
64main event loop and the application is immediately terminated
65(i.e. it returns from the call to <a href="qapplication.html#exec">QApplication::exec</a>() in the
66main() function).
67<p> The event handler <a href="qwidget.html#closeEvent">QWidget::closeEvent</a>() receives close events. The
68default implementation of this event handler accepts the close
69event. If you do not want your widget to be hidden, or want some
70special handing, you should reimplement the event handler.
71<p> The <a href="simple-application.html#closeEvent">closeEvent() in the
72 Application Walkthrough</a> shows a close event handler that
73asks whether to save a document before closing.
74<p> If you want the widget to be deleted when it is closed, create it
75with the <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> widget flag. This is very useful for
76independent top-level windows in a multi-window application.
77<p> <a href="qobject.html">QObject</a>s emits the <a href="qobject.html#destroyed">destroyed()</a> signal when they are deleted.
78<p> If the last top-level window is closed, the
79<a href="qapplication.html#lastWindowClosed">QApplication::lastWindowClosed</a>() signal is emitted.
80<p> The <a href="#isAccepted">isAccepted</a>() function returns TRUE if the event's receiver has
81agreed to close the widget; call <a href="#accept">accept</a>() to agree to close the
82widget and call <a href="#ignore">ignore</a>() if the receiver of this event does not
83want the widget to be closed.
84<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>.
85
86<hr><h2>Member Function Documentation</h2>
87<h3 class=fn><a name="QCloseEvent"></a>QCloseEvent::QCloseEvent ()
88</h3>
89
90<p> Constructs a close event object with the accept parameter flag set
91to FALSE.
92<p> <p>See also <a href="#accept">accept</a>().
93
94<h3 class=fn>void <a name="accept"></a>QCloseEvent::accept ()
95</h3>
96
97<p> Sets the accept flag of the close event object.
98<p> Setting the accept flag indicates that the receiver of this event
99agrees to close the widget.
100<p> The accept flag is <em>not</em> set by default.
101<p> If you choose to accept in <a href="qwidget.html#closeEvent">QWidget::closeEvent</a>(), the widget will
102be hidden. If the widget's <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag is set, it
103will also be destroyed.
104<p> <p>See also <a href="#ignore">ignore</a>() and <a href="qwidget.html#hide">QWidget::hide</a>().
105
106<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>.
107<h3 class=fn>void <a name="ignore"></a>QCloseEvent::ignore ()
108</h3>
109
110<p> Clears the accept flag of the close event object.
111<p> Clearing the accept flag indicates that the receiver of this event
112does not want the widget to be closed.
113<p> The close event is constructed with the accept flag cleared.
114<p> <p>See also <a href="#accept">accept</a>().
115
116<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>.
117<h3 class=fn>bool <a name="isAccepted"></a>QCloseEvent::isAccepted () const
118</h3>
119
120<p> Returns TRUE if the receiver of the event has agreed to close the
121widget; otherwise returns FALSE.
122<p> <p>See also <a href="#accept">accept</a>() and <a href="#ignore">ignore</a>().
123
124<!-- eof -->
125<hr><p>
126This file is part of the <a href="index.html">Qt toolkit</a>.
127Copyright &copy; 1995-2007
128<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
129<table width=100% cellspacing=0 border=0><tr>
130<td>Copyright &copy; 2007
131<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
132<td align=right><div align=right>Qt 3.3.8</div>
133</table></div></address></body>
134</html>
Note: See TracBrowser for help on using the repository browser.