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<html><head><title>The Button 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_03.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_05.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">21.4. The Button Widget</h2><p><a name="INDEX-2841" /><a name="INDEX-2842" /><a name="INDEX-2843" />Create a simple button with the<tt class="literal">Button</tt> method:</p><blockquote><pre class="code">$parentwidget->Button (<em class="replaceable"><tt>options</tt></em>)</pre></blockquote><p>The standard configuration options that apply to<tt class="literal">Button</tt> are: <tt class="literal">-activebackground</tt>, <tt class="literal">-activeforeground</tt>, <tt class="literal">-anchor</tt>,<tt class="literal">-background</tt>, <tt class="literal">-bg</tt>,<tt class="literal">-bitmap</tt>, <tt class="literal">-borderwidth</tt>,<tt class="literal">-bd</tt>, <tt class="literal">-cursor</tt>,<tt class="literal">-default</tt>, <tt class="literal">-disabledforeground</tt>,<tt class="literal">-font</tt>, <tt class="literal">-foreground</tt>,<tt class="literal">-fg</tt>, <tt class="literal">-height</tt>,<tt class="literal">-highlight</tt>-<tt class="literal">background</tt>,<tt class="literal">-highlightcolor</tt>,<tt class="literal">-highlightthickness</tt>, <tt class="literal">-image</tt>,<tt class="literal">-justify</tt>, <tt class="literal">-padx</tt>,<tt class="literal">-pady</tt>, <tt class="literal">-relief</tt>,<tt class="literal">-state</tt>, <tt class="literal">-takefocus</tt>,<tt class="literal">-underline</tt>, <tt class="literal">-width</tt>, and<tt class="literal">-wraplength</tt>.</p><p>Other options are:</p><dl><dt><b><tt class="literal">-command =></tt> <em class="replaceable">callback</em></b></dt><dd><a name="INDEX-2844" />Pointer to a function that will becalled when the button is pressed.</p></dd><dt><b><tt class="literal">-text =></tt> <tt class="literal">'</tt><em class="replaceable">text</em><tt class="literal">'</tt></b></dt><dd><a name="INDEX-2845" />Defines the text string displayed onthe button. See also <tt class="literal">-textvariable</tt>.</p></dd><dt><b><tt class="literal">-textvariable =></tt> <tt class="literal">\$</tt><em class="replaceable">variable</em></b></dt><dd><a name="INDEX-2846" />Points to the variable containing textto be displayed in the button. Button text will change as<tt class="literal">$</tt><em class="replaceable"><tt>variable</tt></em> does.</p></dd></dl><a name="perlnut2-CHP-21-SECT-4.1" /><div class="sect2"><h3 class="sect2">21.4.1. Button Methods</h3><p>In addition to <tt class="literal">configure</tt> and<tt class="literal">cget</tt>, the following methods can be used for<tt class="literal">Button</tt>:</p><dl><dt><b><tt class="literal">flash</tt></b></dt><dd><a name="INDEX-2847" />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-2848" />Invokes the callback command as if thebutton 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_03.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_05.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">21.3. Common Widget Configuration Options</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">21.5. The Checkbutton 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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