edu.uci.ics.jung.visualization.renderers.DefaultNodeLabelRenderer Maven / Gradle / Ivy
/*
* Copyright (c) 2005, The JUNG Authors
* All rights reserved.
*
* This software is open-source under the BSD license; see either "license.txt"
* or https://github.com/jrtom/jung/blob/master/LICENSE for a description.
*
* Created on Apr 14, 2005
*/
package edu.uci.ics.jung.visualization.renderers;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.Rectangle;
import java.io.Serializable;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
/**
* DefaultNodeLabelRenderer is similar to the cell renderers used by the JTable and JTree JFC
* classes.
*
* @author Tom Nelson
*/
@SuppressWarnings("serial")
public class DefaultNodeLabelRenderer extends JLabel implements NodeLabelRenderer, Serializable {
protected static Border noFocusBorder = new EmptyBorder(0, 0, 0, 0);
protected Color pickedNodeLabelColor = Color.black;
/**
* Creates a default table cell renderer.
*
* @param pickedNodeLabelColor the color to use for rendering the labels of picked nodes
*/
public DefaultNodeLabelRenderer(Color pickedNodeLabelColor) {
this.pickedNodeLabelColor = pickedNodeLabelColor;
setOpaque(true);
setBorder(noFocusBorder);
}
/**
* Overrides JComponent.setForeground
to assign the unselected-foreground color to
* the specified color.
*
* @param c set the foreground color to this value
*/
@Override
public void setForeground(Color c) {
super.setForeground(c);
}
/**
* Overrides JComponent.setBackground
to assign the unselected-background color to
* the specified color.
*
* @param c set the background color to this value
*/
@Override
public void setBackground(Color c) {
super.setBackground(c);
}
/**
* Notification from the UIManager
that the look and feel has changed. Replaces the
* current UI object with the latest version from the UIManager
.
*
* @see JComponent#updateUI
*/
@Override
public void updateUI() {
super.updateUI();
setForeground(null);
setBackground(null);
}
/**
* Returns the default label renderer for a Node
*
* @param vv the VisualizationViewer
to render on
* @param value the value to assign to the label for Node
* @param node the Node
* @return the default label renderer
*/
public Component getNodeLabelRendererComponent(
JComponent vv, Object value, Font font, boolean isSelected, N node) {
super.setForeground(vv.getForeground());
if (isSelected) {
setForeground(pickedNodeLabelColor);
}
super.setBackground(vv.getBackground());
if (font != null) {
setFont(font);
} else {
setFont(vv.getFont());
}
setIcon(null);
setBorder(noFocusBorder);
setValue(value);
return this;
}
/*
* The following methods are overridden as a performance measure to
* to prune code-paths are often called in the case of renders
* but which we know are unnecessary. Great care should be taken
* when writing your own renderer to weigh the benefits and
* drawbacks of overriding methods like these.
*/
/**
* Overridden for performance reasons. See the Implementation Note for
* more information.
*/
@Override
public boolean isOpaque() {
Color back = getBackground();
Component p = getParent();
if (p != null) {
p = p.getParent();
}
boolean colorMatch =
(back != null) && (p != null) && back.equals(p.getBackground()) && p.isOpaque();
return !colorMatch && super.isOpaque();
}
/**
* Overridden for performance reasons. See the Implementation Note for
* more information.
*/
@Override
public void validate() {}
/**
* Overridden for performance reasons. See the Implementation Note for
* more information.
*/
@Override
public void revalidate() {}
/**
* Overridden for performance reasons. See the Implementation Note for
* more information.
*/
@Override
public void repaint(long tm, int x, int y, int width, int height) {}
/**
* Overridden for performance reasons. See the Implementation Note for
* more information.
*/
@Override
public void repaint(Rectangle r) {}
/**
* Overridden for performance reasons. See the Implementation Note for
* more information.
*/
@Override
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
// Strings get interned...
if (propertyName == "text") {
super.firePropertyChange(propertyName, oldValue, newValue);
}
}
/**
* Overridden for performance reasons. See the Implementation Note for
* more information.
*/
@Override
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {}
/**
* Sets the String
object for the cell being rendered to value
.
*
* @param value the string value for this cell; if value is null
it sets the text
* value to an empty string
* @see JLabel#setText
*/
protected void setValue(Object value) {
setText((value == null) ? "" : value.toString());
}
}
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