import java.awt.BorderLayout;
import java.awt.Component;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.ToolTipManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellRenderer;
public class MainClass {
public static void main(final String args[]) {
JFrame frame = new JFrame("Tree Tips");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTree tree = new JTree(new String[]{"a","b","c"});
ToolTipManager.sharedInstance().registerComponent(tree);
TreeCellRenderer renderer = new ToolTipTreeCellRenderer();
tree.setCellRenderer(renderer);
JScrollPane scrollPane = new JScrollPane(tree);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setSize(300, 150);
frame.setVisible(true);
}
}
class ToolTipTreeCellRenderer implements TreeCellRenderer {
DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
public ToolTipTreeCellRenderer() {
}
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected,
boolean expanded, boolean leaf, int row, boolean hasFocus) {
Object tip = null;
if (value != null) {
if (value instanceof DefaultMutableTreeNode) {
tip = ((DefaultMutableTreeNode) value).getUserObject();
} else {
tip = tree.convertValueToText(value, selected, expanded, leaf, row, hasFocus);
}
renderer.setToolTipText((String)tip);
}
renderer.setText((String)tip);
return renderer;
}
}
|
