JTree选择问题

• 这是一个简短的示例：
• 这对我有用

  Java 1.8.0

  ：Bug ID：JDK-8023474第一次按下鼠标并没有开始在JTree中进行编辑

    import java.awt.*;    import java.awt.event.*;    import java.util.*;    import javax.swing.*;    import javax.swing.tree.*;    public class JComboBoxJTree2 {      public JComponent makeUI() {        String[] m = {"Running", "Paused", "Stopped"};        DefaultMutableTreeNode root = new DefaultMutableTreeNode(new Node("Plugins"));        root.add(new DefaultMutableTreeNode(new Node("Plugin 1", m)));        root.add(new DefaultMutableTreeNode(new Node("Plugin 2", m)));        DefaultMutableTreeNode leaf = new DefaultMutableTreeNode(new Node("Plugin 3", m));        root.add(leaf);        leaf.add(new DefaultMutableTreeNode(new Node("Plugin 3A", m)));        leaf.add(new DefaultMutableTreeNode(new Node("Plugin 3B", m)));        JTree tree = new JTree(root);        RendererDispatcher rendererDispatcher = new RendererDispatcher(new JComboBox<String>());        RendererDispatcher editorDispatcher = new RendererDispatcher(new JComboBox<String>());        tree.setCellRenderer(rendererDispatcher);        tree.setCellEditor(editorDispatcher);        tree.setEditable(true);        return new JScrollPane(tree);      }      public static void main(String[] args) {        EventQueue.invokeLater(new Runnable() {          @Override public void run() { createAndShowGUI();          }        });      }      public static void createAndShowGUI() {        Jframe f = new Jframe();        f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);        f.getContentPane().add(new JComboBoxJTree2().makeUI());        f.setSize(320, 240);        f.setLocationRelativeTo(null);        f.setVisible(true);      }    }    class Node {      private final String name;      private final String[] plugins;      private int selectedPluginIndex;      public Node(String name, String... plugins) {        this.name = name;        this.plugins = plugins;      }      public String toString() {        return name;      }      public int getSelectedPluginIndex() {        return selectedPluginIndex;      }      public void setSelectedPluginIndex(int selectedPluginIndex) {        this.selectedPluginIndex = selectedPluginIndex;      }      public String[] getPlugins() {        return plugins;      }    }    class RendererDispatcher extends DefaultCellEditor implements TreeCellRenderer {      private final JPanel panel = new JPanel();      private final JLabel pluginName = new JLabel();      private final JComboBox<String> comboBox;      private Node node;      public RendererDispatcher(JComboBox<String> comboBox) {        super(comboBox);        this.comboBox = comboBox;        panel.setOpaque(false);        panel.add(pluginName);        panel.add(comboBox);      }      @Override public Component getTreeCellRendererComponent(          JTree tree, Object value, boolean selected, boolean expanded,          boolean leaf, int row, boolean hasFocus) {        Node node = extractNode(value);        setContents(node);        return panel;      }      @Override public Component getTreeCellEditorComponent(          JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row) {        Node node = extractNode(value);        setContents(node);        this.node = node;        return panel;      }      @Override public Object getCellEditorValue() {        Object o = super.getCellEditorValue();        DefaultComboBoxModel<String> m = (DefaultComboBoxModel<String>) comboBox.getModel();        Node n = new Node(pluginName.getText(), node.getPlugins());        n.setSelectedPluginIndex(m.getIndexOf(o));        return n;      }      @Override public boolean isCellEditable(final EventObject event) {        Object source = event.getSource();        if (!(source instanceof JTree) || !(event instanceof MouseEvent)) {          return false;        }        final JTree tree = (JTree) source;        final MouseEvent mouseEvent = (MouseEvent) event;        final TreePath path = tree.getPathForLocation(mouseEvent.getX(), mouseEvent.getY());        if (path == null) {          return false;        }        Object node = path.getLastPathComponent();        if (node == null || !(node instanceof DefaultMutableTreeNode)) {          return false;        }        Rectangle r = tree.getPathBounds(path);        if (r == null) {          return false;        }        Dimension d = panel.getPreferredSize();        r.setSize(new Dimension(d.width, r.height));        if (r.contains(mouseEvent.getX(), mouseEvent.getY())) {          EventQueue.invokeLater(new Runnable() { @Override public void run() {   Point pt = SwingUtilities.convertPoint(tree, mouseEvent.getPoint(), panel);   //System.out.println(pt);   Object o = SwingUtilities.getDeepestComponentAt(panel, pt.x, pt.y);   if (o instanceof JComboBox) {     comboBox.showPopup();   } else if (o instanceof Component) {     Object oo = SwingUtilities.getAncestorOfClass(JComboBox.class, (Component) o);     if (oo instanceof JComboBox) {       comboBox.showPopup();     }   } }          });          return true;        }        return delegate.isCellEditable(event);      }      private static Node extractNode(Object value) {        if (value instanceof DefaultMutableTreeNode) {          DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;          Object userObject = node.getUserObject();          if (userObject instanceof Node) { return (Node) userObject;          }        }        return null;      }      private void setContents(Node node) {        if (node == null) {          return;        }        pluginName.setText(node.toString());        DefaultComboBoxModel<String> model = (DefaultComboBoxModel<String>) comboBox.getModel();        model.removeAllElements();        if (node.getPlugins().length > 0) {          panel.add(comboBox);          for (String s : node.getPlugins()) { model.addElement(s);          }          comboBox.setSelectedIndex(node.getSelectedPluginIndex());        } else {          panel.remove(comboBox);        }      }    }