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SampleTreeCellRenderer.java
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1998-06-30
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/*
* @(#)SampleTreeCellRenderer.java 1.8 98/01/07
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
import com.sun.java.swing.Icon;
import com.sun.java.swing.ImageIcon;
import com.sun.java.swing.JLabel;
import com.sun.java.swing.JTree;
import com.sun.java.swing.tree.TreeCellRenderer;
import com.sun.java.swing.tree.DefaultMutableTreeNode;
import java.awt.Component;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
public class SampleTreeCellRenderer extends JLabel implements TreeCellRenderer
{
/** Font used if the string to be displayed isn't a font. */
static protected Font defaultFont;
/** Icon to use when the item is collapsed. */
static protected ImageIcon collapsedIcon;
/** Icon to use when the item is expanded. */
static protected ImageIcon expandedIcon;
/** Color to use for the background when selected. */
static protected final Color SelectedBackgroundColor = Color.yellow;//new Color(0, 0, 128);
static
{
try {
defaultFont = new Font("SansSerif", 0, 12);
} catch (Exception e) {}
try {
collapsedIcon = new ImageIcon("images/collapsed.gif");
expandedIcon = new ImageIcon("images/expanded.gif");
} catch (Exception e) {
System.out.println("Couldn't load images: " + e);
}
}
/** Whether or not the item that was last configured is selected. */
protected boolean selected;
/**
* This is messaged from JTree whenever it needs to get the size
* of the component or it wants to draw it.
* This attempts to set the font based on value, which will be
* a TreeNode.
*/
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected, boolean expanded,
boolean leaf, int row,
boolean hasFocus) {
Font font;
String stringValue = tree.convertValueToText(value, selected,
expanded, leaf, row, hasFocus);
/* Set the text. */
setText(stringValue);
/* Tooltips used by the tree. */
setToolTipText(stringValue);
/* Set the image. */
if(expanded)
setIcon(expandedIcon);
else if(!leaf)
setIcon(collapsedIcon);
else
setIcon(null);
/* Set the color and the font based on the SampleData userObject. */
SampleData userObject = (SampleData)((DefaultMutableTreeNode)value)
.getUserObject();
if(hasFocus)
setForeground(Color.cyan);
else
setForeground(userObject.getColor());
if(userObject.getFont() == null)
setFont(defaultFont);
else
setFont(userObject.getFont());
/* Update the selected flag for the next paint. */
this.selected = selected;
return this;
}
/**
* paint is subclassed to draw the background correctly. JLabel
* currently does not allow backgrounds other than white, and it
* will also fill behind the icon. Something that isn't desirable.
*/
public void paint(Graphics g) {
Color bColor;
Icon currentI = getIcon();
if(selected)
bColor = SelectedBackgroundColor;
else if(getParent() != null)
/* Pick background color up from parent (which will come from
the JTree we're contained in). */
bColor = getParent().getBackground();
else
bColor = getBackground();
g.setColor(bColor);
if(currentI != null && getText() != null) {
int offset = (currentI.getIconWidth() + getIconTextGap());
g.fillRect(offset, 0, getWidth() - 1 - offset,
getHeight() - 1);
}
else
g.fillRect(0, 0, getWidth()-1, getHeight()-1);
super.paint(g);
}
}