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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>QDialog Class Reference</h1>
33
34<p>The QDialog class is the base class of dialog windows.
35<a href="#details">More...</a>
36<p><tt>#include &lt;<a href="qdialog-h.html">qdialog.h</a>&gt;</tt>
37<p>Inherits <a href="qwidget.html">QWidget</a>.
38<p>Inherited by <a href="qcolordialog.html">QColorDialog</a>, <a href="qerrormessage.html">QErrorMessage</a>, <a href="qfiledialog.html">QFileDialog</a>, <a href="qfontdialog.html">QFontDialog</a>, <a href="qinputdialog.html">QInputDialog</a>, <a href="qmessagebox.html">QMessageBox</a>, <a href="qmotifdialog.html">QMotifDialog</a>, <a href="qprogressdialog.html">QProgressDialog</a>, <a href="qtabdialog.html">QTabDialog</a>, and <a href="qwizard.html">QWizard</a>.
39<p><a href="qdialog-members.html">List of all member functions.</a>
40<h2>Public Members</h2>
41<ul>
42<li class=fn>explicit <a href="#QDialog"><b>QDialog</b></a> ( QWidget&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0, bool&nbsp;modal = FALSE, WFlags&nbsp;f = 0 )</li>
43<li class=fn><a href="#~QDialog"><b>~QDialog</b></a> ()</li>
44<li class=fn>enum <a href="#DialogCode-enum"><b>DialogCode</b></a> { Rejected, Accepted }</li>
45<li class=fn>int <a href="#result"><b>result</b></a> () const</li>
46<li class=fn>virtual void <a href="#show"><b>show</b></a> ()</li>
47<li class=fn>void <a href="#setOrientation"><b>setOrientation</b></a> ( Orientation&nbsp;orientation )</li>
48<li class=fn>Orientation <a href="#orientation"><b>orientation</b></a> () const</li>
49<li class=fn>void <a href="#setExtension"><b>setExtension</b></a> ( QWidget&nbsp;*&nbsp;extension )</li>
50<li class=fn>QWidget * <a href="#extension"><b>extension</b></a> () const</li>
51<li class=fn>void <a href="#setSizeGripEnabled"><b>setSizeGripEnabled</b></a> ( bool )</li>
52<li class=fn>bool <a href="#isSizeGripEnabled"><b>isSizeGripEnabled</b></a> () const</li>
53<li class=fn>void <a href="#setModal"><b>setModal</b></a> ( bool&nbsp;modal )</li>
54<li class=fn>bool <a href="#isModal"><b>isModal</b></a> () const</li>
55</ul>
56<h2>Public Slots</h2>
57<ul>
58<li class=fn>int <a href="#exec"><b>exec</b></a> ()</li>
59</ul>
60<h2>Properties</h2>
61<ul>
62<li class=fn>bool <a href="#modal-prop"><b>modal</b></a>&nbsp;- whether show() should pop up the dialog as modal or modeless</li>
63<li class=fn>bool <a href="#sizeGripEnabled-prop"><b>sizeGripEnabled</b></a>&nbsp;- whether the size grip is enabled</li>
64</ul>
65<h2>Protected Members</h2>
66<ul>
67<li class=fn>void <a href="#setResult"><b>setResult</b></a> ( int&nbsp;i )</li>
68</ul>
69<h2>Protected Slots</h2>
70<ul>
71<li class=fn>virtual void <a href="#done"><b>done</b></a> ( int&nbsp;r )</li>
72<li class=fn>virtual void <a href="#accept"><b>accept</b></a> ()</li>
73<li class=fn>virtual void <a href="#reject"><b>reject</b></a> ()</li>
74<li class=fn>void <a href="#showExtension"><b>showExtension</b></a> ( bool&nbsp;showIt )</li>
75</ul>
76<hr><a name="details"></a><h2>Detailed Description</h2>
77
78
79The QDialog class is the base class of dialog windows.
80<p>
81
82
83<p> A dialog window is a top-level window mostly used for short-term
84tasks and brief communications with the user. QDialogs may be
85modal or modeless. QDialogs support <a href="#extensibility">extensibility</a> and can provide a <a href="#return">return
86 value</a>. They can have <a href="#default">default
87 buttons</a>. QDialogs can also have a <a href="qsizegrip.html">QSizeGrip</a> in their
88lower-right corner, using <a href="#setSizeGripEnabled">setSizeGripEnabled</a>().
89<p> Note that QDialog uses the parent widget slightly differently from
90other classes in Qt. A dialog is always a top-level widget, but if
91it has a parent, its default location is centered on top of the
92parent's top-level widget (if it is not top-level itself). It will
93also share the parent's taskbar entry.
94<p> <a name="modal"></a>
95<h3> Modal Dialogs
96</h3>
97<a name="1"></a><p> A <b>modal</b> dialog is a dialog that blocks input to other
98visible windows in the same application. Users must finish
99interacting with the dialog and close it before they can access
100any other window in the application. Dialogs that are used to
101request a file name from the user or that are used to set
102application preferences are usually modal.
103<p> The most common way to display a modal dialog is to call its
104<a href="#exec">exec</a>() function. When the user closes the dialog, exec() will
105provide a useful <a href="#return">return value</a>. Typically we
106connect a default button, e.g. "OK", to the <a href="#accept">accept</a>() slot and a
107"Cancel" button to the <a href="#reject">reject</a>() slot, to get the dialog to close
108and return the appropriate value. Alternatively you can connect to
109the <a href="#done">done</a>() slot, passing it <a href="#DialogCode-enum">Accepted</a> or <a href="#DialogCode-enum">Rejected</a>.
110<p> An alternative is to call <a href="#setModal">setModal</a>(TRUE), then <a href="#show">show</a>(). Unlike
111exec(), show() returns control to the caller immediately. Calling
112setModal(TRUE) is especially useful for progress dialogs, where
113the user must have the ability to interact with the dialog, e.g.
114to cancel a long running operation. If you use show() and
115setModal(TRUE) together you must call
116<a href="qapplication.html#processEvents">QApplication::processEvents</a>() periodically during processing to
117enable the user to interact with the dialog. (See <a href="qprogressdialog.html">QProgressDialog</a>.)
118<p> <a name="modeless"></a>
119<h3> Modeless Dialogs
120</h3>
121<a name="1-1"></a><p> A <b>modeless</b> dialog is a dialog that operates
122independently of other windows in the same application. Find and
123replace dialogs in word-processors are often modeless to allow the
124user to interact with both the application's main window and with
125the dialog.
126<p> Modeless dialogs are displayed using show(), which returns control
127to the caller immediately.
128<p> <a name="default"></a>
129<h3> Default button
130</h3>
131<a name="1-2"></a><p> A dialog's <em>default</em> button is the button that's pressed when the
132user presses Enter (Return). This button is used to signify that
133the user accepts the dialog's settings and wants to close the
134dialog. Use <a href="qpushbutton.html#setDefault">QPushButton::setDefault</a>(), <a href="qpushbutton.html#isDefault">QPushButton::isDefault</a>()
135and <a href="qpushbutton.html#autoDefault">QPushButton::autoDefault</a>() to set and control the dialog's
136default button.
137<p> <a name="escapekey"></a>
138<h3> Escape Key
139</h3>
140<a name="1-3"></a><p> If the user presses the Esc key in a dialog, <a href="#reject">QDialog::reject</a>()
141will be called. This will cause the window to close: the <a href="qcloseevent.html">closeEvent</a> cannot be <a href="qcloseevent.html#ignore">ignored</a>.
142<p> <a name="extensibility"></a>
143<h3> Extensibility
144</h3>
145<a name="1-4"></a><p> Extensibility is the ability to show the dialog in two ways: a
146partial dialog that shows the most commonly used options, and a
147full dialog that shows all the options. Typically an extensible
148dialog will initially appear as a partial dialog, but with a
149"More" toggle button. If the user presses the "More" button down,
150the full dialog will appear. The extension widget will be resized
151to its <a href="qwidget.html#sizeHint">sizeHint</a>(). If orientation is <a href="qt.html#Orientation-enum">Horizontal</a> the extension
152widget's <a href="qwidget.html#height">height</a>() will be expanded to the height() of the dialog.
153If the orientation is <a href="qt.html#Orientation-enum">Vertical</a> the extension widget's <a href="qwidget.html#width">width</a>()
154will be expanded to the width() of the dialog. Extensibility is
155controlled with <a href="#setExtension">setExtension</a>(), <a href="#setOrientation">setOrientation</a>() and
156<a href="#showExtension">showExtension</a>().
157<p> <a name="return"></a>
158<h3> Return value (modal dialogs)
159</h3>
160<a name="1-5"></a><p> Modal dialogs are often used in situations where a return value is
161required, e.g. to indicate whether the user pressed "OK" or
162"Cancel". A dialog can be closed by calling the <a href="#accept">accept</a>() or the
163<a href="#reject">reject</a>() slots, and <a href="#exec">exec</a>() will return <a href="#DialogCode-enum">Accepted</a> or <a href="#DialogCode-enum">Rejected</a>
164as appropriate. The exec() call returns the result of the dialog.
165The result is also available from <a href="#result">result</a>() if the dialog has not
166been destroyed. If the <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag is set, the
167dialog is deleted after exec() returns.
168<p> <a name="examples"></a>
169<h3> Examples
170</h3>
171<a name="1-6"></a><p> A modal dialog.
172<p>
173
174<pre> <a href="qfiledialog.html">QFileDialog</a> *dlg = new <a href="qfiledialog.html">QFileDialog</a>( workingDirectory,
175 <a href="qstring.html#QString-null">QString::null</a>, 0, 0, TRUE );
176 <a name="x2130"></a> dlg-&gt;<a href="qwidget.html#setCaption">setCaption</a>( QFileDialog::<a href="qobject.html#tr">tr</a>( "Open" ) );
177 <a name="x2128"></a> dlg-&gt;<a href="qfiledialog.html#setMode">setMode</a>( QFileDialog::ExistingFile );
178 <a href="qstring.html">QString</a> result;
179 <a name="x2126"></a> if ( dlg-&gt;<a href="#exec">exec</a>() == QDialog::<a href="#DialogCode-enum">Accepted</a> ) {
180 <a name="x2127"></a> result = dlg-&gt;<a href="qfiledialog.html#selectedFile">selectedFile</a>();
181 <a name="x2129"></a> workingDirectory = dlg-&gt;<a href="qfiledialog.html#url">url</a>();
182 }
183 delete dlg;
184 return result;
185</pre>
186<p> A modeless dialog. After the <a href="#show">show</a>() call, control returns to the main
187event loop.
188
189
190<pre> int main( int argc, char **argv )
191 {
192 <a href="qapplication.html">QApplication</a> a( argc, argv );
193</pre><pre> int scale = 10;
194</pre><pre> LifeDialog *life = new LifeDialog( scale );
195 <a name="x2133"></a> a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( life );
196 <a name="x2134"></a> life-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Life");
197 <a name="x2135"></a> life-&gt;<a href="qwidget.html#show">show</a>();
198</pre><pre> <a name="x2132"></a> return a.<a href="qapplication.html#exec">exec</a>();
199 }
200</pre>
201<p> <p>See also <a href="qtabdialog.html">QTabDialog</a>, <a href="qwidget.html">QWidget</a>, <a href="qprogressdialog.html">QProgressDialog</a>, <a href="guibooks.html#fowler">GUI Design Handbook: Dialogs, Standard</a>, <a href="abstractwidgets.html">Abstract Widget Classes</a>, and <a href="dialogs.html">Dialog Classes</a>.
202
203<hr><h2>Member Type Documentation</h2>
204<h3 class=fn><a name="DialogCode-enum"></a>QDialog::DialogCode</h3>
205<p> The value returned by a modal dialog.
206<ul>
207<li><tt>QDialog::Accepted</tt>
208<li><tt>QDialog::Rejected</tt>
209</ul><p>
210<hr><h2>Member Function Documentation</h2>
211<h3 class=fn>explicit <a name="QDialog"></a>QDialog::QDialog ( <a href="qwidget.html">QWidget</a>&nbsp;*&nbsp;parent = 0, const&nbsp;char&nbsp;*&nbsp;name = 0, bool&nbsp;modal = FALSE, WFlags&nbsp;f = 0 )
212</h3>
213Constructs a dialog called <em>name</em>, with parent <em>parent</em>.
214<p> A dialog is always a top-level widget, but if it has a parent, its
215default location is centered on top of the parent. It will also
216share the parent's taskbar entry.
217<p> The widget flags <em>f</em> are passed on to the <a href="qwidget.html">QWidget</a> constructor.
218If, for example, you don't want a What's This button in the titlebar
219of the dialog, pass WStyle_Customize | WStyle_NormalBorder |
220WStyle_Title | WStyle_SysMenu in <em>f</em>.
221<p> <b>Warning:</b> In Qt 3.2, the <em>modal</em> flag is obsolete. There is now a
222<a href="#setModal">setModal</a>() function that can be used for obtaining a modal behavior
223when calling <a href="#show">show</a>(). This is rarely needed, because modal dialogs
224are usually invoked using <a href="#exec">exec</a>(), which ignores the <em>modal</em> flag.
225<p> <p>See also <a href="qwidget.html#setWFlags">QWidget::setWFlags</a>() and <a href="qt.html#WidgetFlags-enum">Qt::WidgetFlags</a>.
226
227<h3 class=fn><a name="~QDialog"></a>QDialog::~QDialog ()
228</h3>
229Destroys the QDialog, deleting all its children.
230
231<h3 class=fn>void <a name="accept"></a>QDialog::accept ()<tt> [virtual protected slot]</tt>
232</h3>
233Hides the modal dialog and sets the result code to <a href="#DialogCode-enum">Accepted</a>.
234<p> <p>See also <a href="#reject">reject</a>() and <a href="#done">done</a>().
235
236<p>Examples: <a href="tutorial2-08.html#x2604">chart/setdataform.cpp</a> and <a href="distributor-example.html#x2654">distributor/distributor.ui.h</a>.
237<h3 class=fn>void <a name="done"></a>QDialog::done ( int&nbsp;r )<tt> [virtual protected slot]</tt>
238</h3> Closes the dialog and sets its result code to <em>r</em>. If this dialog
239is shown with <a href="#exec">exec</a>(), <a href="#done">done</a>() causes the local event loop to finish,
240and exec() to return <em>r</em>.
241<p> As with <a href="qwidget.html#close">QWidget::close</a>(), done() deletes the dialog if the <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag is set. If the dialog is the application's
242main widget, the application terminates. If the dialog is the
243last window closed, the <a href="qapplication.html#lastWindowClosed">QApplication::lastWindowClosed</a>() signal is
244emitted.
245<p> <p>See also <a href="#accept">accept</a>(), <a href="#reject">reject</a>(), <a href="qapplication.html#mainWidget">QApplication::mainWidget</a>(), and <a href="qapplication.html#quit">QApplication::quit</a>().
246
247<h3 class=fn>int <a name="exec"></a>QDialog::exec ()<tt> [slot]</tt>
248</h3>
249Shows the dialog as a <a href="#modal">modal</a> dialog,
250blocking until the user closes it. The function returns a <a href="#DialogCode-enum">DialogCode</a> result.
251<p> Users cannot interact with any other window in the same
252application until they close the dialog.
253<p> <p>See also <a href="#show">show</a>() and <a href="#result">result</a>().
254
255<p>Examples: <a href="canvas-chart-example.html#x2877">chart/chartform.cpp</a>, <a href="motif-dialog-example.html#x2706">dialog/mainwindow.cpp</a>, <a href="i18n-example.html#x1936">i18n/main.cpp</a>, <a href="ftpclient-example.html#x739">network/ftpclient/ftpmainwindow.ui.h</a>, <a href="qdialog.html#x2126">network/networkprotocol/view.cpp</a>, <a href="qdir-example.html#x1812">qdir/qdir.cpp</a>, and <a href="wizard-example.html#x16">wizard/main.cpp</a>.
256<h3 class=fn><a href="qwidget.html">QWidget</a>&nbsp;* <a name="extension"></a>QDialog::extension () const
257</h3>
258Returns the dialog's extension or 0 if no extension has been
259defined.
260<p> <p>See also <a href="#setExtension">setExtension</a>().
261
262<h3 class=fn>bool <a name="isModal"></a>QDialog::isModal () const
263</h3><p>Returns TRUE if <a href="#show">show</a>() should pop up the dialog as modal or modeless; otherwise returns FALSE.
264See the <a href="qdialog.html#modal-prop">"modal"</a> property for details.
265<h3 class=fn>bool <a name="isSizeGripEnabled"></a>QDialog::isSizeGripEnabled () const
266</h3><p>Returns TRUE if the size grip is enabled; otherwise returns FALSE.
267See the <a href="qdialog.html#sizeGripEnabled-prop">"sizeGripEnabled"</a> property for details.
268<h3 class=fn><a href="qt.html#Orientation-enum">Orientation</a> <a name="orientation"></a>QDialog::orientation () const
269</h3>
270Returns the dialog's extension orientation.
271<p> <p>See also <a href="#setOrientation">setOrientation</a>().
272
273<h3 class=fn>void <a name="reject"></a>QDialog::reject ()<tt> [virtual protected slot]</tt>
274</h3>
275Hides the modal dialog and sets the result code to <a href="#DialogCode-enum">Rejected</a>.
276<p> <p>See also <a href="#accept">accept</a>() and <a href="#done">done</a>().
277
278<h3 class=fn>int <a name="result"></a>QDialog::result () const
279</h3>
280
281<p> Returns the modal dialog's result code, <a href="#DialogCode-enum">Accepted</a> or <a href="#DialogCode-enum">Rejected</a>.
282<p> Do not call this function if the dialog was constructed with the <a href="qt.html#WidgetFlags-enum">WDestructiveClose</a> flag.
283
284<h3 class=fn>void <a name="setExtension"></a>QDialog::setExtension ( <a href="qwidget.html">QWidget</a>&nbsp;*&nbsp;extension )
285</h3>
286Sets the widget, <em>extension</em>, to be the dialog's extension,
287deleting any previous extension. The dialog takes ownership of the
288extension. Note that if 0 is passed any existing extension will be
289deleted.
290<p> This function must only be called while the dialog is hidden.
291<p> <p>See also <a href="#showExtension">showExtension</a>(), <a href="#setOrientation">setOrientation</a>(), and <a href="#extension">extension</a>().
292
293<h3 class=fn>void <a name="setModal"></a>QDialog::setModal ( bool&nbsp;modal )
294</h3><p>Sets whether <a href="#show">show</a>() should pop up the dialog as modal or modeless to <em>modal</em>.
295See the <a href="qdialog.html#modal-prop">"modal"</a> property for details.
296<h3 class=fn>void <a name="setOrientation"></a>QDialog::setOrientation ( <a href="qt.html#Orientation-enum">Orientation</a>&nbsp;orientation )
297</h3>
298If <em>orientation</em> is <a href="qt.html#Orientation-enum">Horizontal</a>, the extension will be displayed
299to the right of the dialog's main area. If <em>orientation</em> is <a href="qt.html#Orientation-enum">Vertical</a>, the extension will be displayed below the dialog's main
300area.
301<p> <p>See also <a href="#orientation">orientation</a>() and <a href="#setExtension">setExtension</a>().
302
303<h3 class=fn>void <a name="setResult"></a>QDialog::setResult ( int&nbsp;i )<tt> [protected]</tt>
304</h3>
305
306<p> Sets the modal dialog's result code to <em>i</em>.
307
308<h3 class=fn>void <a name="setSizeGripEnabled"></a>QDialog::setSizeGripEnabled ( bool )
309</h3><p>Sets whether the size grip is enabled.
310See the <a href="qdialog.html#sizeGripEnabled-prop">"sizeGripEnabled"</a> property for details.
311<h3 class=fn>void <a name="show"></a>QDialog::show ()<tt> [virtual]</tt>
312</h3>
313Shows the dialog as a <a href="#modeless">modeless</a> dialog.
314Control returns immediately to the calling code.
315<p> The dialog will be modal or modeless according to the value
316of the <a href="#modal-prop">modal</a> property.
317<p> <p>See also <a href="#exec">exec</a>() and <a href="#modal-prop">modal</a>.
318
319<p>Examples: <a href="movies-example.html#x494">movies/main.cpp</a>, <a href="regexptester-example.html#x2511">regexptester/main.cpp</a>, <a href="showimg-example.html#x1317">showimg/showimg.cpp</a>, and <a href="sql.html#x2220">sql/overview/form1/main.cpp</a>.
320<p>Reimplemented from <a href="qwidget.html#show">QWidget</a>.
321<h3 class=fn>void <a name="showExtension"></a>QDialog::showExtension ( bool&nbsp;showIt )<tt> [protected slot]</tt>
322</h3>
323If <em>showIt</em> is TRUE, the dialog's extension is shown; otherwise the
324extension is hidden.
325<p> This slot is usually connected to the <a href="qbutton.html#toggled">QButton::toggled</a>() signal
326of a <a href="qpushbutton.html">QPushButton</a>.
327<p> A dialog with a visible extension is not resizeable.
328<p> <p>See also <a href="#show">show</a>(), <a href="#setExtension">setExtension</a>(), and <a href="#setOrientation">setOrientation</a>().
329
330<hr><h2>Property Documentation</h2>
331<h3 class=fn>bool <a name="modal-prop"></a>modal</h3> <p>This property holds whether <a href="#show">show</a>() should pop up the dialog as modal or modeless.
332<p>By default, this property is false and show() pops up the dialog as
333modeless.
334<p> <a href="#exec">exec</a>() ignores the value of this property and always pops up the
335dialog as modal.
336<p> <p>See also <a href="#show">show</a>() and <a href="#exec">exec</a>().
337
338<p>Set this property's value with <a href="#setModal">setModal</a>() and get this property's value with <a href="#isModal">isModal</a>().
339<h3 class=fn>bool <a name="sizeGripEnabled-prop"></a>sizeGripEnabled</h3>
340<p>This property holds whether the size grip is enabled.
341<p>A <a href="qsizegrip.html">QSizeGrip</a> is placed in the bottom right corner of the dialog when this
342property is enabled. By default, the size grip is disabled.
343
344<p>Set this property's value with <a href="#setSizeGripEnabled">setSizeGripEnabled</a>() and get this property's value with <a href="#isSizeGripEnabled">isSizeGripEnabled</a>().
345<!-- eof -->
346<hr><p>
347This file is part of the <a href="index.html">Qt toolkit</a>.
348Copyright &copy; 1995-2007
349<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
350<table width=100% cellspacing=0 border=0><tr>
351<td>Copyright &copy; 2007
352<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
353<td align=right><div align=right>Qt 3.3.8</div>
354</table></div></address></body>
355</html>
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