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<TITLE>Using a Position in a JTextComponent
(Java Developers Almanac Example)
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<h3>
e973.
Using a Position in a JTextComponent</h3>
A position marks a location between two characters in a
<code>JTextComponent</code>. The position attempts to remain between the same
two characters despite edits to the <code>JTextComponent</code>. For example,
if the position is at location 10 and the first character is deleted,
the new location of the position becomes 9.
<P> When text is inserted at the position, a position's bias
determines whether the position remains in the same location or is
moved at the end of the new text. By default, <code>createPosition()</code>
returns a position with a right bias which means inserting text at the
position causes the position to move to the end of the inserted text.
There is no way to change the bias at present.
<pre>
JTextComponent textComp = new <font color="#0066ff"><i>JTextArea()</i></font>;
Document doc = textComp.getDocument();
Position p = null;
try {
// Create a right-bias Position object
int location = <font color="#0066ff"><i>3</i></font>;
p = doc.createPosition(location);
} catch (BadLocationException e) {
}
// Retrieve the current location of the Position object
int location = p.getOffset();
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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
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e969. <a class="eglink" href="EditTextField.html?l=rel">
Modifying Text in a JTextComponent
</a>
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e970. <a class="eglink" href="ConcurReadText.html?l=rel">
Asynchronously Reading the Contents of a Visible JTextComponent
</a>
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e971. <a class="eglink" href="FindWord.html?l=rel">
Finding Word Boundaries in a JTextComponent
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e972. <a class="eglink" href="GetWrappedLines.html?l=rel">
Retrieving the Visible Lines in a JTextComponent
</a>
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e974. <a class="eglink" href="LimitText.html?l=rel">
Limiting the Capacity of a JTextComponent
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e975. <a class="eglink" href="DragEnabledTextArea.html?l=rel">
Enabling Text-Dragging on a JTextComponent
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e976. <a class="eglink" href="ShareDoc.html?l=rel">
Sharing a Document Between JTextComponents
</a>
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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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