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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>10.2. The Alignment widget</title><meta name="generator" content="DocBook XSL Stylesheets V1.65.1"><link rel="home" href="index.html" title="PyGTK 2.0 Tutorial"><link rel="up" href="ch-ContainerWidgets.html" title="Chapter 10. Container Widgets"><link rel="previous" href="ch-ContainerWidgets.html" title="Chapter 10. Container Widgets"><link rel="next" href="sec-Fixed.html" title="10.3. Fixed Container"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">10.2. The Alignment widget</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch-ContainerWidgets.html">Prev</a> </td><th width="60%" align="center">Chapter 10. Container Widgets</th><td width="20%" align="right"> <a accesskey="n" href="sec-Fixed.html">Next</a></td></tr></table><hr></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sec-Alignment"></a>10.2. The Alignment widget</h2></div></div><div></div></div><p>The <tt class="classname">Alignment</tt> widget allows you to place
a widget within its window at a position and size relative to the size of
the <tt class="classname">Alignment</tt> widget itself. For example, it can be
very useful for centering a widget within the window.</p><p>There are only two calls associated with the
<tt class="classname">Alignment</tt> widget:</p><table border="0" bgcolor="#E0E0E0" width="100%"><tr><td><pre class="programlisting">
alignment = gtk.Alignment(<b class="parameter"><tt>xalign</tt></b>=0.0, <b class="parameter"><tt>yalign</tt></b>=0.0, <b class="parameter"><tt>xscale</tt></b>=0.0, <b class="parameter"><tt>yscale</tt></b>=0.0)
alignment.set(<b class="parameter"><tt>xalign</tt></b>, <b class="parameter"><tt>yalign</tt></b>, <b class="parameter"><tt>xscale</tt></b>, <b class="parameter"><tt>yscale</tt></b>)
</pre></td></tr></table><p>The <tt class="function">gtk.Alignment</tt>() function creates a new
<tt class="classname">Alignment</tt> widget with the specified parameters. The
<tt class="methodname">set</tt>() method allows the alignment parameters of an
existing <tt class="classname">Alignment</tt> widget to be altered.</p><p>All four alignment parameters are floating point numbers which
can range from 0.0 to 1.0. The <i class="parameter"><tt>xalign</tt></i> and
<i class="parameter"><tt>yalign</tt></i> arguments affect the position of the widget
placed within the <a href="http://www.pygtk.org/pygtk2reference/class-gtkalignment.html" target="_top"><tt class="classname">gtk.Alignment</tt></a>
widget. The align properties specify the fraction of
<span class="emphasis"><em>free</em></span> space that will be placed above or to the left of
the child widget. The values range from 0.0 (no <span class="emphasis"><em>free</em></span>
space above or to the left of the child) to 1.0 (all
<span class="emphasis"><em>free</em></span> space above or to the left of the child). Of
course, if the scale properties are both set to 1.0, the alignment
properties have no effect since the child widget will expand to fill the
available space.</p><p>The <i class="parameter"><tt>xscale</tt></i> and
<i class="parameter"><tt>yscale</tt></i> arguments specify the fraction of
<span class="emphasis"><em>free</em></span> space absorbed by the child widget. The values can
range from 0.0 (meaning the child absorbs none) to 1.0 (meaning the child
absorbs all of the <span class="emphasis"><em>free</em></span> space).</p><p>A child widget can be added to this
<tt class="classname">Alignment</tt> widget using:</p><table border="0" bgcolor="#E0E0E0" width="100%"><tr><td><pre class="programlisting">
alignment.add(<b class="parameter"><tt>widget</tt></b>)
</pre></td></tr></table><p>For an example of using an <tt class="classname">Alignment</tt>
widget, refer to the <a href="examples/progressbar.py" target="_top"><span><b class="command">progressbar.py</b></span></a>
example for the Progress Bar widget.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch-ContainerWidgets.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch-ContainerWidgets.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sec-Fixed.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 10. Container Widgets </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 10.3. Fixed Container</td></tr></table></div></body></html>
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