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MainPanel.java
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141 lines (125 loc) · 4.61 KB
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// -*- mode:java; encoding:utf-8 -*-
// vim:set fileencoding=utf-8:
// @homepage@
package example;
import java.awt.*;
import java.util.Optional;
import java.util.logging.Logger;
import javax.swing.*;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
JTree tree = new JTree();
tree.setComponentPopupMenu(new TreePopupMenu());
add(new JScrollPane(tree));
setPreferredSize(new Dimension(320, 240));
}
public static void main(String[] args) {
EventQueue.invokeLater(MainPanel::createAndShowGui);
}
private static void createAndShowGui() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException ignored) {
Toolkit.getDefaultToolkit().beep();
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException ex) {
Logger.getGlobal().severe(ex::getMessage);
return;
}
JFrame frame = new JFrame("@title@");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
final class TreePopupMenu extends JPopupMenu {
private final JTextField field = new JTextField(24) {
private transient AncestorListener listener;
@Override public void updateUI() {
removeAncestorListener(listener);
super.updateUI();
listener = new FocusAncestorListener();
addAncestorListener(listener);
}
};
private TreePath path;
/* default */ TreePopupMenu() {
super();
add("add").addActionListener(e -> addNode());
add("add & reload").addActionListener(e -> addAndReload());
add("edit").addActionListener(e -> edit());
addSeparator();
add("remove").addActionListener(e -> remove());
}
private void addNode() {
// https://ateraimemo.com/Swing/ScrollRectToVisible.html
JTree tree = (JTree) getInvoker();
DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
DefaultMutableTreeNode parent = (DefaultMutableTreeNode) path.getLastPathComponent();
DefaultMutableTreeNode child = new DefaultMutableTreeNode("New node");
model.insertNodeInto(child, parent, parent.getChildCount());
tree.scrollPathToVisible(new TreePath(child.getPath()));
}
private void addAndReload() {
JTree tree = (JTree) getInvoker();
DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
DefaultMutableTreeNode parent = (DefaultMutableTreeNode) path.getLastPathComponent();
DefaultMutableTreeNode child = new DefaultMutableTreeNode("New node");
parent.add(child);
model.reload(parent); // = model.nodeStructureChanged(parent);
tree.scrollPathToVisible(new TreePath(child.getPath()));
}
private void edit() {
Object node = path.getLastPathComponent();
if (node instanceof DefaultMutableTreeNode) {
DefaultMutableTreeNode leaf = (DefaultMutableTreeNode) node;
field.setText(leaf.getUserObject().toString());
JTree tree = (JTree) getInvoker();
int ret = JOptionPane.showConfirmDialog(
tree, field, "edit", JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
if (ret == JOptionPane.OK_OPTION) {
tree.getModel().valueForPathChanged(path, field.getText());
// leaf.setUserObject(str);
// model.nodeChanged(leaf);
}
}
}
private void remove() {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
if (!node.isRoot()) {
JTree tree = (JTree) getInvoker();
DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
model.removeNodeFromParent(node);
}
}
@Override public void show(Component c, int x, int y) {
if (c instanceof JTree) {
JTree tree = (JTree) c;
// TreePath[] tsp = tree.getSelectionPaths();
path = tree.getPathForLocation(x, y);
// if (Objects.nonNull(path) && Arrays.asList(tsp).contains(path)) {
Optional.ofNullable(path).ifPresent(treePath -> {
tree.setSelectionPath(treePath);
super.show(c, x, y);
});
}
}
}
class FocusAncestorListener implements AncestorListener {
@Override public void ancestorAdded(AncestorEvent e) {
e.getComponent().requestFocusInWindow();
}
@Override public void ancestorMoved(AncestorEvent e) {
/* not needed */
}
@Override public void ancestorRemoved(AncestorEvent e) {
/* not needed */
}
}