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| package com.mkhelif.swing;
import javax.swing.ComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;
import javax.swing.text.PlainDocument;
/**
* <p>JCompletionBox enable auto-completion on a JComboBox</p>
*
* @author Marwan KHELIF
* @version Version 1.0 - 03/07/2007
*/
public class JCompletionBox extends PlainDocument {
private static final long serialVersionUID = 1L;
private ComboBoxModel model;
private JTextComponent editor;
private boolean selecting = false;
/**
* <p>Enable auto-completion on a JComboBox</p>
*
* @param comboBox - the JComboBox we want to add auto-completion.
*/
public static void enableAutoCompletion (JComboBox comboBox) {
new JCompletionBox (comboBox);
} // enableAutoCompletion ()
/**
* <p>Constructor of JCompletionBox</p>
* @param comboBox the JComboBox we want to add auto-completion
*/
private JCompletionBox (JComboBox comboBox) {
super ();
model = comboBox.getModel ();
editor = (JTextComponent) comboBox.getEditor ().getEditorComponent ();
comboBox.setEditable (true);
((JTextComponent) comboBox.getEditor ().getEditorComponent ()).setDocument (this);
} // JCompletionBox ()
/*
* @see javax.swing.text.AbstractDocument#remove(int, int)
*/
public void remove (int offs, int len) throws BadLocationException {
if (selecting) {
return;
}
super.remove (offs, len);
} // remove ()
/*
* @see javax.swing.text.PlainDocument#insertString(int, java.lang.String, javax.swing.text.AttributeSet)
*/
public void insertString (int offs, String str, AttributeSet a) throws BadLocationException {
if (selecting) {
return;
}
super.insertString (offs, str, a);
Object item = lookupItem (this.getText (0, this.getLength ()));
this.setSelectedItem (item);
if (item == null) {
return;
}
this.setText (item.toString ());
this.highlightCompletedText (offs + str.length ());
} // insertString ()
/**
* <p>Replace the text in JComboBox textfield.</p>
*
* @param text - The text to set on JComboBox textfield.
* @throws BadLocationException
*/
private void setText (String text) throws BadLocationException {
super.remove (0, getLength ());
super.insertString (0, text, null);
} // setText ()
/**
* <p>Highlight from start to end of text</p>
*
* @param start - Start of highlighting.
*/
private void highlightCompletedText (int start) {
editor.setSelectionStart (start);
editor.setSelectionEnd (getLength());
} // highlightCompletedText ()
/**
* <p>Select item on JComboBox.</p>
*
* @param item - The item to select.
*/
private void setSelectedItem (Object item) {
selecting = true;
model.setSelectedItem (item);
selecting = false;
} // setSelectedItem ()
/**
* <p>Search in JComboBox items to find one which match the pattern.</p>
*
* @param pattern the pattern we are looking for.
* @return the matching item or null if no item found.
*/
private Object lookupItem (String pattern) {
for (int i = 0, n = model.getSize () ; i < n ; i++) {
Object currentItem = model.getElementAt (i);
if (startsWithIgnoreCase (currentItem.toString (), pattern)) {
return currentItem;
}
}
return null;
} // lookupItem ()
/**
* <p>Check if str1 starts with str2 ignoring case.</p>
*
* @param str1
* @param str2
* @return true - if str1 starts with str2 ignoring case.
*/
private boolean startsWithIgnoreCase (String str1, String str2) {
return str1.toLowerCase ().startsWith (str2.toLowerCase ());
} // startsWithIgnoreCase ()
} // JCompletionBox |
classe JCompletionBox de Marwan KHELIF
)
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