8.18. Formatting a Portion of a Text Field
Problem
You want to add formatting to some, but not all, text in a text field, or you want to apply different formatting to various parts of a text field.
Solution
Create a TextFormat
object and use it to format
a substring of the text field using one of the
setTextFormat( )
method variations.
Discussion
You can format an entire text field as shown in Recipe 8.16, or you can use one of the versions of
the setTextFormat( )
method to format just a
portion of a text field. These variations allow you to apply
formatting to the specified character range only.
You can set the formatting for a single character within a text field
by invoking the setTextFormat( )
method and
passing it two parameters:
-
index
The zero-relative index of the character to which the formatting should be applied
-
textFormatObj
A reference to a
TextFormat
object
This example applies the formatting to the first character only:
myTextField.setTextFormat(0, myTextFormat);
Alternatively, if you want to apply the formatting to a range of
characters, you can invoke setTextFormat( )
with
three parameters:
-
startIndex
The beginning, zero-relative character index
-
endIndex
The index of the character after the last character in the desired range
-
textFormatObj
A reference to a
TextFormat
object
This example applies the formatting to the 1st through 10th characters:
myTextField.setTextFormat(0, 10, myTextFormat);
You may notice that certain formatting options are not applied under certain circumstances ...
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