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Configuring Subwidget Options
Configuring Subwidget Options Using the Tk Option Database
The
-options
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.
Options in the Tk Option Database can be specified using the
option
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
name
of the subwidgets. For example, if we have
a mega widget called
.a.b.megaw
and it has a subwidget whose
name is
subw
, then we can be sure that the pathname of the
subwidget will be something like
.a.b.megaw.foo.bar.subw
Therefore, if we want to specify options for it in the Option
Database, we can issue commands like:
option add *a.b.megaw*subw.option1 value1
option add *a.b.megaw*subw.option2 value2
Notice that it will be wrong to issue the commands as:
option add *a.b.megaw.subw.option1 value1
option add *a.b.megaw.subw.option2 value2
because in general we will not know whether the subwidget is an
immediate child window of
.a.b.megaw
(
such a decision
is left to the mega-widget implementor and may vary in different
versions of the same mega-widget
).
Program 1-7 demonstrates how the Tk Option Database can be
used to achieve the same effect as program 1-5.
option add *TixControl*label.width       8
option add *TixControl*label.anchor      e
option add *TixControl*entry.width       10
option add *TixControl*entry.borderWidth 3
tixControl .income -label "Income: " -variable income
tixControl .age    -label "Age: "    -variable age
pack .income .age -side top
(Figure 1-7) Using the Tk Option Database in Place of the
-options
switch
http://tix.sourceforge.net
http://tix.sourceforge.net
