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<TITLE>Highlighting Words in a JTextComponent (Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h1>The Java Developers Almanac 1.4</h1>
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Order this book from <a href="/cgi-bin/scripts/redirect.pl?l=ex&url=http://www.amazon.com/exec/obidos/ASIN/0201752808/xeo">Amazon</a>.
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<INPUT size="25" name="words" type="text"><INPUT value="Search" type="submit">
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<h3>e1006. Highlighting Words in a JTextComponent</h3>
This example demonstrates how to highlight a range of characters in a
text component using highlights. The example uses a text component's
highlighter to create and manage the highlights. Since one of the
highlights in the highlighter is the selection, we must be careful
when removing highlights not to remove the selection.
<P> The way in which we identify our highlights is to create the
highlight using a private painter. So when removing highlights from
the highlighter, we remove only the ones whose painter is an instance
of the private painter.
<P> If many different highlight styles are required, it is
necessary to use styles with a <code>JTextPane</code>. See
<a href="../javax.swing.text/style_HiliteWords2.html" class="eglink"><b>e1007</b> Setting the Font and Color of Text in a JTextPane Using Styles</a> for more details.
<pre> JTextArea textComp = new JTextArea();
// Highlight the occurrences of the word "public"
highlight(textComp, <font color="#0066ff"><i>"public"</i></font>);
// Creates highlights around all occurrences of pattern in textComp
public void highlight(JTextComponent textComp, String pattern) {
// First remove all old highlights
removeHighlights(textComp);
try {
Highlighter hilite = textComp.getHighlighter();
Document doc = textComp.getDocument();
String text = doc.getText(0, doc.getLength());
int pos = 0;
// Search for pattern
while ((pos = text.indexOf(pattern, pos)) >= 0) {
// Create highlighter using private painter and apply around pattern
hilite.addHighlight(pos, pos+pattern.length(), myHighlightPainter);
pos += pattern.length();
}
} catch (BadLocationException e) {
}
}
// Removes only our private highlights
public void removeHighlights(JTextComponent textComp) {
Highlighter hilite = textComp.getHighlighter();
Highlighter.Highlight[] hilites = hilite.getHighlights();
for (int i=0; i<hilites.length; i++) {
if (hilites[i].getPainter() instanceof MyHighlightPainter) {
hilite.removeHighlight(hilites[i]);
}
}
}
// An instance of the private subclass of the default highlight painter
Highlighter.HighlightPainter myHighlightPainter = new MyHighlightPainter(<font color="#0066ff"><i>Color.red</i></font>);
// A private subclass of the default highlight painter
class MyHighlightPainter extends DefaultHighlighter.DefaultHighlightPainter {
public MyHighlightPainter(Color color) {
super(color);
}
}
</pre>
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<b>Related Examples</b></font></td>
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e1007. <a class="eglink" href="style_HiliteWords2.html?l=rel">
Setting the Font and Color of Text in a JTextPane Using Styles
</a>
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e1008. <a class="eglink" href="style_ShareStyleContext.html?l=rel">
Sharing Styles Between JTextPanes
</a>
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e1009. <a class="eglink" href="style_ListStyles.html?l=rel">
Listing the Styles Associated with a JTextPane
</a>
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e1010. <a class="eglink" href="style_ListAttr.html?l=rel">
Listing the Attributes in a Style
</a>
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e1011. <a class="eglink" href="style_ListStyles2.html?l=rel">
Using a Popup to Apply Styles to a JTextPane
</a>
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e1012. <a class="eglink" href="style_SetPara.html?l=rel">
Retaining the Logical Style When Setting a New Paragraph Style
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e1013. <a class="eglink" href="style_ModStyle.html?l=rel">
Automatically Updating Styled Text When a Style Is Updated
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e1014. <a class="eglink" href="style_IsCharPara.html?l=rel">
Determining If a Style Attribute Applies to a Character or the Paragraph
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See also:
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#Actions%20and%20Key%20Bindings">
Actions and Key Bindings
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#Caret%20and%20Selection">
Caret and Selection
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JEditorPane">
JEditorPane
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JFormattedTextField">
JFormattedTextField
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextArea">
JTextArea
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextComponent">
JTextComponent
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextField">
JTextField
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextPane">
JTextPane
</a>
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