This demo features two simple new HighlightPainters
: the UnderlineHighlightPainter
and the TextBoxHighlightPainter
.
Swing already does all the heavy lifting here for us. We can add these just like any other HighlightPainter
:
UnderlineHighlightPainter painter = new UnderlineHighlightPainter(Color.red, 1, true); String word = "the"; int i1 = textPane.getText().indexOf(word); if (i1 != -1) { int i2 = i1 + word.length(); textPane.getHighlighter().addHighlight(i1, i2, painter); }
The "squiggly" underline has become the ubiquitous marker for cautionary flags in text panes. A decade or two ago it was only used to flag misspellings, but increasingly it's also used to flag grammatical warnings. You could also flag syntactical errors or warnings for a language like XML or Java.
The TextBoxHighlightPainter
is a simpler upgrade to the DefaultHighlightPainter
that offers a potential gradient or rounded corners.