In my project i have a Jtree with custom node (which extends DefaultMutableTreeNode). Each node is associated with a boolean value. When the boolean is False i woul like to strike the texte of my node. So for example :
I tried to create a new Font but i don't find any properties to strike the text and i only managed to add my custom font to the whole tree and not node by node.
I think that i should use the TreeRenderer but i can't find any method to help me strike the node.
Does someone have an idea on i can do it ?
Check out the example below. For keeping it simple, I am just striking through the selected node. You need to, of course, use your own check on the value.
package snippet;
import java.awt.Component;
import java.awt.Font;
import java.awt.font.TextAttribute;
import java.util.Map;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.tree.DefaultTreeCellRenderer;
public class JTreeTest extends JFrame {
private final class StrikeoutCellRenderer extends DefaultTreeCellRenderer {
private static final long serialVersionUID = 1L;
@Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded,
boolean leaf, int row, boolean hasFocus) {
Component c = super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
Font font = c.getFont();
Map attributes = font.getAttributes();
if(sel)
attributes.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
else
attributes.remove(TextAttribute.STRIKETHROUGH);
Font newFont = new Font(attributes);
c.setFont(newFont);
return c;
}
}
private static final long serialVersionUID = 1L;
public JTreeTest() {
super(JTreeTest.class.getName());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
initComponents();
}
private void initComponents() {
JTree tree = new JTree();
tree.setCellRenderer(new StrikeoutCellRenderer());
add(tree);
pack();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override public void run() {
JTreeTest t = new JTreeTest();
t.setVisible(true);
}
});
}
}
Note that even if the node doesn't need a strike through, you need to reset the attribute, since a single component is used for painting all the nodes.