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+<title>TQt Tutorial - Chapter 3: Family Values</title>
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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>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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
+#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
+#include &lt;<a href="qfont-h.html">qfont.h</a>&gt;
+#include &lt;<a href="qvbox-h.html">qvbox.h</a>&gt;
+
+int main( int argc, char **argv )
+{
+ <a href="qapplication.html">TQApplication</a> a( argc, argv );
+
+ <a href="qvbox.html">TQVBox</a> box;
+ box.<a href="qwidget.html#resize">resize</a>( 200, 120 );
+
+ <a href="qpushbutton.html">TQPushButton</a> tquit( "Quit", &amp;box );
+ tquit.<a href="qwidget.html#setFont">setFont</a>( TQFont( "Times", 18, TQFont::Bold ) );
+
+ TQObject::<a href="qobject.html#connect">connect</a>( &amp;tquit, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), &amp;a, SLOT(<a href="qapplication.html#tquit">tquit</a>()) );
+
+ a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;box );
+ box.<a href="qwidget.html#show">show</a>();
+
+ return a.<a href="qapplication.html#exec">exec</a>();
+}
+</pre>
+
+
+
+<p> <h2> Line-by-line Walkthrough
+</h2>
+<a name="1"></a><p> <pre> #include &lt;<a href="qvbox-h.html">qvbox.h</a>&gt;
+</pre>
+<p> We add an include of qvbox.h to get the layout class we'll use.
+<p> <pre> <a href="qvbox.html">TQVBox</a> box;
+</pre>
+<p> Here we simply create a vertical box container. The <a href="qvbox.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="qwidget.html#sizePolicy">TQWidget::sizePolicy</a>().
+<p> <pre> <a name="x2300"></a> box.<a href="qwidget.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="qpushbutton.html">TQPushButton</a> tquit( "Quit", &amp;box );
+</pre>
+<p> A child is born.
+<p> This <a href="qpushbutton.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="qwidget.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="qwidget.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="qwidget.html#sizeHint">TQWidget::sizeHint</a>() and <a href="qwidget.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 &copy; 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>