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<TITLE> Configuring Subwidget Options Using the Tk Option Database<A NAME=136> </A></TITLE>
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<A NAME=Contents> </A><H3><A NAME=SECTION00033600000000000000> Configuring Subwidget Options Using the Tk Option Database<A NAME=136> </A></A></H3>
<P>
The <tt>-options</tt> switch is good if you want to specify subwidget
options for one or a few mega-widgets. If you want to specify the
subwidget for many mega-widgets, it is easier to use the Tk Option
Database.
<P>
Options in the Tk Option Database can be specified using the <tt>option</tt> command and the pathname of the widget. For all the Tix
mega-widgets, it is guaranteed that the pathname of their subwidgets
ends with the <em>name</em> of the subwidgets. For example, if we have
a mega widget called <tt>.a.b.megaw</tt> and it has a subwidget whose
name is <tt>subw</tt>, then we can be sure that the pathname of the
subwidget will be something like
<P>
<blockquote> <tt> .a.b.megaw.foo.bar.subw
</tt>
</blockquote>
<P>
Therefore, if we want to specify options for it in the Option
Database, we can issue commands like:
<P>
<blockquote> <tt> option add *a.b.megaw*subw.option1 value1<BR>
option add *a.b.megaw*subw.option2 value2
</tt>
</blockquote>
<P>
Notice that it will be wrong to issue the commands as:
<P>
<blockquote> <tt> option add *a.b.megaw.subw.option1 value1<BR>
option add *a.b.megaw.subw.option2 value2
</tt>
</blockquote>
<P>
because in general we will not know whether the subwidget is an
immediate child window of <tt>.a.b.megaw</tt> (<em>such a decision
is left to the mega-widget implementor and may vary in different
versions of the same mega-widget</em>).
<P>
Program 1-7 demonstrates how the Tk Option Database can be
used to achieve the same effect as program 1-5.
<P>
<blockquote> <tt> option add *TixControl*label.width 8<BR>
option add *TixControl*label.anchor e<BR>
option add *TixControl*entry.width 10<BR>
option add *TixControl*entry.borderWidth 3<BR>
<BR>
tixControl .income -label "Income: " -variable income<BR>
tixControl .age -label "Age: " -variable age<BR>
<BR>
pack .income .age -side top
</tt>
</blockquote>
(Figure 1-7) Using the Tk Option Database in Place of the <tt>-options</tt> switch<A NAME=17> </A>
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