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<td bgcolor="ffffff" width="15">&nbsp;</td><td bgcolor="ffffff" align="left" valign="top" cellspacing="0" cellpadding="0"><img alt="" src="images/tkhello.jpg"></td><td bgcolor="ffffff" width="12">&nbsp;</td><td valign="top" align="left" bgcolor="ffffff" width="*">
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>What's a widget, anyway?</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 1 页（共7 页）</nobr></font></td>
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<p>Tk is the graphical Toolkit extension for Tcl. Tk release versions 
				are coordinated with those of Tcl. In the panels that follow, we'll 
				review the Tk widget set, examine some of the configuration 
				options, and set up some examples to demonstrate the useful 
				nature of Tk.</p>
<p>It's difficult to convince any PHB (Pointy Haired Boss)
				that this section of the 
				tutorial is work related. After all, it is about widgets, 
				and conceptually widgets are closely related to play...but 
				this <i>is</i> work, so let's dig into it. First, here's 
				the code for a Tk enhanced "Hello, World!"</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12"> 
#!/usr/bin/wish
#
# Hello World, Tk-style
 
button .hello -text Hello \
  -command {puts stdout \
  "Hello, World!"}
button .goodbye -text Bye! \
  -command {exit}
 
pack .hello -padx 60 -pady 5
pack .goodbye -padx 60 -pady 5
			</code>
</pre>
<p>Invoking <i>wish</i> (the Tk shell) in the first line brings up 
				a Window widget of default size. Then I defined two				
				button widgets, <i>.hello</i> and <i>.goodbye</i> -- these 
				are packed into the window, and the window shrinks to the size 
				defined by the specified button spacing. When the script is 
				executed, you get the dialog shown at the left. 
				Click on the <i><b>Hello</b></i> 
				button to get "Hello, World!" output in the parent terminal 
				window, Click on <i><b>Bye!</b></i> to terminate the script.</p>
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