/*
* 12/22/2008
*
* DelegatingCellRenderer.java - A renderer for Completions that will delegate
* to the Completion's provider's renderer, if there is one.
*
* This library is distributed under a modified BSD license. See the included
* RSyntaxTextArea.License.txt file for details.
*/
package org.fife.ui.autocomplete;
import java.awt.Component;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
/**
* List cell renderer that delegates to a {@link CompletionProvider}'s
* renderer, if it has one. If it doesn't, it calls into a fallback renderer.
* If a fallback renderer isn't specified, it simply renders
* <code>(({@link Completion})value).toString()</code>.
*
* @author Robert Futrell
* @version 1.0
*/
class DelegatingCellRenderer extends DefaultListCellRenderer {
/**
* The renderer to fall back on if one isn't specified by a provider.
* This is usually <tt>this</tt>.
*/
private ListCellRenderer fallback;
/**
* Returns the fallback cell renderer.
*
* @return The fallback cell renderer.
* @see #setFallbackCellRenderer(ListCellRenderer)
*/
public ListCellRenderer getFallbackCellRenderer() {
return fallback;
}
/**
* {@inheritDoc}
*/
@Override
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean selected, boolean hasFocus) {
Completion c = (Completion)value;
CompletionProvider p = c.getProvider();
ListCellRenderer r = p.getListCellRenderer();
if (r!=null) {
return r.getListCellRendererComponent(list, value, index, selected,
hasFocus);
}
if (fallback==null) {
return super.getListCellRendererComponent(list, value, index,
selected, hasFocus);
}
return fallback.getListCellRendererComponent(list, value, index,
selected, hasFocus);
}
/**
* Sets the fallback cell renderer.
*
* @param fallback The fallback cell renderer. If this is
* <code>null</code>, <tt>this</tt> will be used.
* @see #getFallbackCellRenderer()
*/
public void setFallbackCellRenderer(ListCellRenderer fallback) {
this.fallback = fallback;
}
/**
* {@inheritDoc}
*/
@Override
public void updateUI() {
super.updateUI();
if ((fallback instanceof JComponent) && fallback!=this) {
((JComponent)fallback).updateUI();
}
}
}