You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
123 lines
5.4 KiB
123 lines
5.4 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tutorial.doc:303 -->
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
|
<title>TQt Tutorial - Chapter 3: Family Values</title>
|
|
<style type="text/css"><!--
|
|
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>TQt Tutorial - Chapter 3: Family Values</h1>
|
|
|
|
|
|
<p> <center><img src="t3.png" alt="Screenshot of tutorial three"></center>
|
|
<p> This example shows how to create parent and child widgets.
|
|
<p> We'll keep it simple and use just a single parent and a lone child.
|
|
<p> <pre>/****************************************************************
|
|
**
|
|
** TQt tutorial 3
|
|
**
|
|
****************************************************************/
|
|
|
|
#include <<a href="qapplication-h.html">ntqapplication.h</a>>
|
|
#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
|
|
#include <<a href="qfont-h.html">ntqfont.h</a>>
|
|
#include <<a href="qvbox-h.html">ntqvbox.h</a>>
|
|
|
|
int main( int argc, char **argv )
|
|
{
|
|
<a href="ntqapplication.html">TQApplication</a> a( argc, argv );
|
|
|
|
<a href="ntqvbox.html">TQVBox</a> box;
|
|
box.<a href="ntqwidget.html#resize">resize</a>( 200, 120 );
|
|
|
|
<a href="ntqpushbutton.html">TQPushButton</a> quit( "Quit", &box );
|
|
quit.<a href="ntqwidget.html#setFont">setFont</a>( TQFont( "Times", 18, TQFont::Bold ) );
|
|
|
|
TQObject::<a href="ntqobject.html#connect">connect</a>( &quit, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), &a, TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()) );
|
|
|
|
a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &box );
|
|
box.<a href="ntqwidget.html#show">show</a>();
|
|
|
|
return a.<a href="ntqapplication.html#exec">exec</a>();
|
|
}
|
|
</pre>
|
|
|
|
|
|
|
|
<p> <h2> Line-by-line Walkthrough
|
|
</h2>
|
|
<a name="1"></a><p> <pre> #include <<a href="qvbox-h.html">ntqvbox.h</a>>
|
|
</pre>
|
|
<p> We add an include of ntqvbox.h to get the layout class we'll use.
|
|
<p> <pre> <a href="ntqvbox.html">TQVBox</a> box;
|
|
</pre>
|
|
<p> Here we simply create a vertical box container. The <a href="ntqvbox.html">TQVBox</a> arranges
|
|
its child widgets in a vertical row, one above the other, handing out
|
|
space according to each child's <a href="ntqwidget.html#sizePolicy">TQWidget::sizePolicy</a>().
|
|
<p> <pre> <a name="x2300"></a> box.<a href="ntqwidget.html#resize">resize</a>( 200, 120 );
|
|
</pre>
|
|
<p> We set its width to 200 pixels and the height to 120 pixels.
|
|
<p> <pre> <a href="ntqpushbutton.html">TQPushButton</a> quit( "Quit", &box );
|
|
</pre>
|
|
<p> A child is born.
|
|
<p> This <a href="ntqpushbutton.html">TQPushButton</a> is created with both a text ("Quit") and a parent
|
|
(box). A child widget is always on top of its parent. When
|
|
displayed, it is clipped by its parent's bounds.
|
|
<p> The parent widget, the TQVBox, automatically adds the child centered in
|
|
its box. Because nothing else is added, the button gets all the space
|
|
the parent has.
|
|
<p> <pre> <a name="x2302"></a> box.<a href="ntqwidget.html#show">show</a>();
|
|
</pre>
|
|
<p> When a parent widget is shown, it will call show for all its children
|
|
(except those on which you have done an explicit <a href="ntqwidget.html#hide">TQWidget::hide</a>()).
|
|
<p> <h2> Behavior
|
|
</h2>
|
|
<a name="2"></a><p> The button no longer fills the entire widget. Instead, it gets a
|
|
"natural" size. This is because there is now a new top-level widget,
|
|
which uses the button's size hint and size change policy to set the
|
|
button's size and position. (See <a href="ntqwidget.html#sizeHint">TQWidget::sizeHint</a>() and <a href="ntqwidget.html#setSizePolicy">TQWidget::setSizePolicy</a>() for more information about these functions.)
|
|
<p> (See <a href="tutorial1-01.html#compiling">Compiling</a> for how to create a
|
|
makefile and build the application.)
|
|
<p> <h2> Exercises
|
|
</h2>
|
|
<a name="3"></a><p> Try resizing the window. How does the button change? What is the
|
|
button's size-change policy? What happens to the button's height if
|
|
you run the program with a bigger font? What happens if you try to
|
|
make the window <em>really</em> small?
|
|
<p> You're now ready for <a href="tutorial1-04.html">Chapter 4.</a>
|
|
<p> [<a href="tutorial1-02.html">Previous tutorial</a>]
|
|
[<a href="tutorial1-04.html">Next tutorial</a>]
|
|
[<a href="tutorial.html">Main tutorial page</a>]
|
|
<p>
|
|
<!-- eof -->
|
|
<p><address><hr><div align=center>
|
|
<table width=100% cellspacing=0 border=0><tr>
|
|
<td>Copyright © 2007
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|