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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Blacksmith, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.ui.swing.components;
import java.awt.Component;
import java.awt.Dimension;
import javax.swing.JList;
import javax.swing.JViewport;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
/**
* A list cell renderer that wraps its text to subsequent lines depending on the
* length of text string and the width of the parent list.
*
* This renderer depends on listening to the parent list's viewport and fixing
* the list's width to match the viewport's size.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @date $Date: 2006-02-18 18:19:05 -0500 (Sat, 18 Feb 2006) $
* @revision $Revision: 904 $
*/
public class LineWrappingRenderer extends MultiLineLabel implements ListCellRenderer, ChangeListener {
protected static Border noFocusBorder;
protected JList list;
protected JViewport viewport;
protected int preferredWidth;
/**
* Required constructor. The renderer keeps a reference to the list in which it
* is used and its viewport. This list is the only list that may use this
* renderer. The renderer will use the current size of the list to determine
* where lines will initially break.
*
* @param containerList The list that will be using this renderer.
*/
public LineWrappingRenderer(JList containerList) {
super();
setLineWrap(true);
noFocusBorder = new EmptyBorder(1, 1, 1, 1);
list = containerList;
preferredWidth = 400;
if (list.getParent() instanceof JViewport) {
viewport = (JViewport) list.getParent();
viewport.addChangeListener(this);
int newWidth = viewport.getExtentSize().width;
if (newWidth > 0)
preferredWidth = newWidth;
} else {
// should function adequately in absence of a viewport
// System.err.println( "LineWrappingRenderer.init: list.getParent = " +
// list.getParent() );
}
}
/**
* Returns the preferred size of the label, with width constrained to the
* current width.
*
* @return the size
*/
public Dimension getPreferredSize() {
int width = getWidth();
if (width != preferredWidth) {
// if component has not yet been placed within the list
if (width < list.getWidth() / 2)
width = list.getWidth();
preferredWidth = width;
}
return new Dimension(preferredWidth, super.getPreferredSize().height);
}
/**
* Returns this component with the width set to the width of the specified
* JList.
*
* @return this component.
*/
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected,
boolean cellHasFocus) { // System.out.println( "LineWrappingRenderer.getListCellRendererComponent:" );
if (list != this.list) {
System.err.println("LineWrappingRenderer.getListCellRendererComponent: "
+ "warning: the list using the renderer is not the list specified in the constructor.");
}
if (isSelected) {
setBackground(this.list.getSelectionBackground());
setForeground(this.list.getSelectionForeground());
} else {
setBackground(this.list.getBackground());
setForeground(this.list.getForeground());
}
setText((value == null) ? "" : value.toString());
setEnabled(this.list.isEnabled());
setFont(this.list.getFont());
setBorder((cellHasFocus) ? UIManager.getBorder("List.focusCellHighlightBorder") : noFocusBorder);
return this;
}
/**
* Overridden to respond to viewport changes.
*/
public void stateChanged(ChangeEvent e) {
int newWidth = viewport.getExtentSize().width;
if (newWidth > 0)
preferredWidth = newWidth;
// set fixed width on list
list.setFixedCellWidth(preferredWidth);
setSize(preferredWidth, super.getSize().height);
}
}
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