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Configuring and Deleting
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Creating Display Items
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Creating Display Items
Setting the Styles of the Display Items
Note that in the above example, if we want to control the foreground color
of the text items, we cannot issue commands such as:
.t insert end -itemtype text -text "First Item" -foreground black
because
-foreground
is not an individual attribute of the text
item. Instead, it is a collective attribute and must be accessed using a
display style object. To do that we can use the command
tixItemStyle
to create display styles, as shown in the following
example:
set style1 [tixDisplayStyle text -font 8x13]
set style2 [tixDisplayStyle text -font 8x13bold]
tixTList .t; pack .t
.t insert end -itemtype text -text "First Item"  -underline 0
-style $style1
.t insert end -itemtype text -text "Second Item" -underline 0
-style $style2
.t insert end -itemtype text -text "Third Item"  -underline 0
-style $style1
The first argument of
tixDisplayStyle
specify the type of style we
want to create. Each type of display item needs its own type of display
styles. Therefore, for example, we cannot create a style of type
text
and assign it to an item of type
image
. The subsequent
arguments to
tixDisplayStyle
set the configuration options of the
collective attributes defined by this style. A complete list of the
configuration options of each type of the display style is in figures ???
through ???.
The
tixDisplayStyle
command returns the names of the newly created
styles to us and we use the variables
style1
and
style2
to
store these names. We can then assign the styles to the display items by
using the names of the styles. As shown in figure 3-5, by
assing these two styles to the
-style
option of the display items,
we assigned a medium-weight font to the first and third item and a bold
font to the second item.
(Figure 3-5) Two Display Styles With Different Fonts
The name of the style returned by
tixDisplayStyle
is also the name
of a command which we can use to control the style. For example, we can
use the following commands to switch the fonts in the two styles we
created in the above example:
$style1 configure -font 8x13bold
$style2 configure -font 8x13
After the execution of the above command, the font in the second item in
the TixTList widget becomes medium-weight and the font in the first and
third items becomes bold, as shown in figure 3-5.
http://tix.sourceforge.net
http://tix.sourceforge.net
