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<html><head><title>The Radiobutton Widget (Perl in a Nutshell, 2nd Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Stephen Spainhour" /><meta name="DC.Format" content="text/xml" scheme="MIME" /><meta name="DC.Language" content="en-US" /><meta name="DC.Publisher" content="O'Reilly & Associates, Inc." /><meta name="DC.Source" scheme="ISBN" content="0596002416L" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="Perl in a Nutshell, 2nd Edition" /><meta name="DC.Type" content="Text.Monograph" /></head><body bgcolor="#ffffff"><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Java and XSLT" /><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch21_05.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228" /><td align="right" valign="top" width="228"><a href="ch21_07.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">21.6. The Radiobutton Widget</h2><p><a name="INDEX-2866" /><a name="INDEX-2867" /><a name="INDEX-2868" />Create a radiobutton with the<tt class="literal">Radiobutton</tt> method. A radiobutton has an indicatorto the left of the label indicating whether the button is selected.It differs from a checkbutton in that only one button may be selectedat a time. Each button in a group of radiobuttons uses the samevariable specified with the <tt class="literal">-variable</tt> option; whenselected, the button assigns that variable the value specified by the<tt class="literal">-value</tt> option.</p><blockquote><pre class="code">$parentwidget->Radiobutton (<em class="replaceable"><tt>options</tt></em>)</pre></blockquote><p>The standard configuration options that apply to<tt class="literal">Radiobutton</tt> are:<tt class="literal">-activeback</tt>-<tt class="literal">ground</tt>,<tt class="literal">-activeforeground</tt>, <tt class="literal">-anchor</tt>,<tt class="literal">-background</tt>, <tt class="literal">-bg</tt>,<tt class="literal">-bitmap</tt>, <tt class="literal">-borderwidth</tt>,<tt class="literal">-bd</tt>, <tt class="literal">-cursor</tt>,<tt class="literal">-disabledforeground</tt>, <tt class="literal">-font</tt>,<tt class="literal">-foreground</tt>, <tt class="literal">-fg</tt>,<tt class="literal">-height</tt>,<tt class="literal">-highlight</tt>-<tt class="literal">background</tt>,<tt class="literal">-highlightcolor</tt>,<tt class="literal">-highlightthickness</tt>, <tt class="literal">-image</tt>,<tt class="literal">-justify</tt>, <tt class="literal">-padx</tt>,<tt class="literal">-pady</tt>, <tt class="literal">-relief</tt>,<tt class="literal">-state</tt>, <tt class="literal">-underline</tt>,<tt class="literal">-width</tt>, and <tt class="literal">-wraplength</tt>.</p><p>Other options are:</p><dl><dt><b><tt class="literal">-command =></tt> <em class="replaceable">callback</em></b></dt><dd><a name="INDEX-2869" />Pointer to a function that will becalled when the radiobutton is pressed.</p></dd><dt><b><tt class="literal">-indicatoron =></tt> <em class="replaceable">boolean</em></b></dt><dd><a name="INDEX-2870" />Determines whether to display theindicator. Default is on (<tt class="literal">1</tt>).</p></dd><dt><b><tt class="literal">-selectcolor =></tt> <em class="replaceable">color</em></b></dt><dd><a name="INDEX-2871" />Color of the indicator when theradiobutton is on.</p></dd><dt><b><tt class="literal">-selectimage =></tt> <em class="replaceable">imgptr</em></b></dt><dd><a name="INDEX-2872" />Defines the image to be displayedinstead of text when the radiobutton is on. Ignored if<tt class="literal">-image</tt> is not used.</p></dd><dt><b><tt class="literal">-text =></tt> <tt class="literal">'</tt><em class="replaceable">text</em><tt class="literal">'</tt></b></dt><dd><a name="INDEX-2873" />Defines the text string displayed inthe radiobutton. See also <tt class="literal">-textvariable</tt>.</p></dd><dt><b><tt class="literal">-textvariable =></tt> <tt class="literal">\$</tt><em class="replaceable">variable</em></b></dt><dd><a name="INDEX-2874" />Points to the variable containing textto be displayed in the radiobutton. Button text will change as<tt class="literal">$</tt><em class="replaceable"><tt>variable</tt></em> does.</p></dd><dt><b><tt class="literal">-value =></tt> <em class="replaceable">value</em></b></dt><dd><a name="INDEX-2875" />Sets<tt class="literal">$</tt><em class="replaceable"><tt>variable</tt></em> to thespecified value when the radiobutton is selected. Default is<tt class="literal">1</tt>.</p></dd><dt><b><tt class="literal">-variable =></tt> <tt class="literal">\$</tt><em class="replaceable">variable</em></b></dt><dd><a name="INDEX-2876" />Associates the on/off value of theindicator with the specified variable.</p></dd></dl><a name="perlnut2-CHP-21-SECT-6.1" /><div class="sect2"><h3 class="sect2">21.6.1. Radiobutton Methods</h3><p>In addition to <tt class="literal">configure</tt> and<tt class="literal">cget</tt>, the following methods are supported by<tt class="literal">Radiobutton</tt>:</p><dl><dt><b><tt class="literal">deselect</tt></b></dt><dd><a name="INDEX-2877" />Deselects the button and sets thevariable to the empty string.</p></dd><dt><b><tt class="literal">select</tt></b></dt><dd><a name="INDEX-2878" />Sets the radio button.</p></dd><dt><b><tt class="literal">flash</tt></b></dt><dd><a name="INDEX-2879" />Causes the button to flash from thenormal to active state colors.</p></dd><dt><b><tt class="literal">invoke</tt></b></dt><dd><a name="INDEX-2880" />Selects the button and invokes thecallback command as if the radiobutton was clicked.</p></dd></dl></div><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch21_05.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0" /></a></td><td align="right" valign="top" width="228"><a href="ch21_07.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">21.5. The Checkbutton Widget</td><td align="center" valign="top" width="228"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0" /></a></td><td align="right" valign="top" width="228">21.7. The Label Widget</td></tr></table></div><hr width="684" align="left" /><img src="../gifs/navbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links" /><p><p><font size="-1"><a href="copyrght.htm">Copyright © 2002</a> O'Reilly & Associates. 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