getwrappedlines.html
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<TITLE>Retrieving the Visible Lines in a JTextComponent
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
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<h3>
e972.
Retrieving the Visible Lines in a JTextComponent</h3>
There are <font color="#0066ff"><i>hard</i></font> and <font color="#0066ff"><i>soft</i></font> line breaks when viewing the contents
of a text component. Hard line breaks are caused by a newline
character in the contents. Soft line breaks are a result of word
wrapping by the text component. Word wrapping occurs strictly on the
display; it does not change the contents (i.e. newlines are not
inserted into the contents).
<P> This example demonstrates how to retrieve the contents with
soft line breaks. The retrieval does not modify the contents; it
returns the contents with additional newlines for soft line breaks.
<P> Note: <code>getWrappedLines()</code> can be used directly if called
within an event thread. To call it on a visible text component
outside an event thread, use the <code>Document.render()</code> method to
safely retrieve the text. See
<a href="../javax.swing.text/ConcurReadText.html" class="eglink"><font size="-1"><b>e970</b> Asynchronously Reading the Contents of a Visible JTextComponent</font></a> for an example.
<pre>
// Returns null if comp does not have a size
public static String getWrappedText(JTextComponent c) {
int len = c.getDocument().getLength();
int offset = 0;
// Increase 10% for extra newlines
StringBuffer buf = new StringBuffer((int)(len*1.10));
try {
while (offset < len) {
int end = Utilities.getRowEnd(c, offset);
if (end < 0) {
break;
}
// Include the last character on the line
end = Math.min(end+1, len);
String s = c.getDocument().getText(offset, end-offset);
buf.append(s);
// Add a newline if s does not have one
if (!s.endsWith("\n")) {
buf.append('\n');
}
offset = end;
}
} catch (BadLocationException e) {
}
return buf.toString();
}
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Related Examples
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e967. <a class="eglink" href="GetText.html?l=rel">
Retrieving Text from a JTextComponent
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e968. <a class="eglink" href="PartialSeg.html?l=rel">
Retrieving All the Text from a JTextComponent Efficiently
</a>
<br>
e969. <a class="eglink" href="EditTextField.html?l=rel">
Modifying Text in a JTextComponent
</a>
<br>
e970. <a class="eglink" href="ConcurReadText.html?l=rel">
Asynchronously Reading the Contents of a Visible JTextComponent
</a>
<br>
e971. <a class="eglink" href="FindWord.html?l=rel">
Finding Word Boundaries in a JTextComponent
</a>
<br>
e973. <a class="eglink" href="Pos.html?l=rel">
Using a Position in a JTextComponent
</a>
<br>
e974. <a class="eglink" href="LimitText.html?l=rel">
Limiting the Capacity of a JTextComponent
</a>
<br>
e975. <a class="eglink" href="DragEnabledTextArea.html?l=rel">
Enabling Text-Dragging on a JTextComponent
</a>
<br>
e976. <a class="eglink" href="ShareDoc.html?l=rel">
Sharing a Document Between JTextComponents
</a>
<br>
e977. <a class="eglink" href="WalkViews.html?l=rel">
Enumerating All the Views in a JTextComponent
</a>
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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#JTextField">
JTextField
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextPane">
JTextPane
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#Styles">
Styles
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