JTree und CellEditor funktionieren nicht richtig, wenn zwei verschiedene Objekte im selben JTree verwendet werden

Question

Ich habe gerade ein Problem mit dem Zelleneditor von JTree. Ich habe zwei verschiedene Objekte in meinem JTree, Benutzer und Bücher.

So ist der Benutzer Bianca und die Bücher sind die Knoten. Die Beschriftungen in diesen Knoten (das Auge, die Farbetikette und der Mülleimer) können ebenfalls angeklickt werden. Wenn ich jedoch meinen Zelleneditor einstelle, bekomme ich eine Null-Ausnahme. Ich denke, weil ich mit zwei verschiedenen Objekten arbeite, kann ich den Zelleneditor nicht richtig einstellen. Dies ist die spezifische Methode, wo ich glaube, ich habe das Problem:

public Component getTreeCellEditorComponent(JTree tree, Object value, boolean isSelected, boolean expanded, 
     boolean leaf, int row) { 
    Component returnValue = null; 
    System.out.println("loo"); 
    if ((value != null) && (value instanceof DefaultMutableTreeNode)) { 
     Object userObject = ((DefaultMutableTreeNode) value) 
       .getUserObject(); 
     System.out.println("b"); 
     if(userObject instanceof Book){ 
      Book feature = (Book) userObject; 
      title.setText(feature.getTitulo()); 
      renderer.setEnabled(tree.isEnabled()); 
      returnValue = renderer; 
      System.out.println("hi!!"); 
     } 
    } 
    if (returnValue == null) { 
     System.out.println("hi1"); 
     returnValue = defaultEditor.getTreeCellEditorComponent(tree, value, isSelected, expanded, leaf, row); 
     System.out.println(defaultEditor); 

    } 
    return returnValue; 
} 

Ich weiß nicht, wie der DefaultCellEditor zurückzukehren, wenn die Art des Knotens nicht Buch ist.

Unten ist mein gesamte Code, wenn jemand das Problem replizieren will:

Klasse Buch:

public class Book { 
    String titulo; 

    public String getTitulo() { 
     return titulo; 
    } 

    public void setTitulo(String titulo) { 
     this.titulo = titulo; 
    } 
    public Book(String titulo){ 
     this.titulo = titulo; 
    } 
} 

Klasse Benutzer

public class User { 
    String nomeUser; 

    public String getNomeUser() { 
     return nomeUser; 
    } 

    public void setNomeUser(String nomeUser) { 
     this.nomeUser = nomeUser; 
    } 
    public User(String nome){ 
     this.nomeUser = nome; 
    } 
} 

Klasse Render (verwendet, um den Zelleneditor und Zellputz des JTree)

import java.awt.Component; 
import java.awt.FlowLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.io.IOException; 
import java.io.InputStream; 

import javax.imageio.ImageIO; 
import javax.swing.AbstractCellEditor; 
import javax.swing.ImageIcon; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTree; 
import javax.swing.tree.DefaultMutableTreeNode; 
import javax.swing.tree.DefaultTreeCellRenderer; 
import javax.swing.tree.TreeCellEditor; 
import javax.swing.tree.TreeCellRenderer; 


public class Render{ 
public static class NodeCellRenderer implements TreeCellRenderer{ 
     private JLabel nomeRadar; 
     private JPanel renderer; 
     private JLabel btnVisible; 
     private JLabel btnPaint; 
     private JLabel btnTrash; 

     DefaultTreeCellRenderer defaultRenderer = new DefaultTreeCellRenderer(); 
     public NodeCellRenderer() throws IOException{ 
      renderer = new JPanel(new FlowLayout(5, 5,5)); 
      nomeRadar = new JLabel(); 
      renderer.add(nomeRadar); 
      btnVisible = new JLabel(); 
      btnPaint = new JLabel(); 
      btnTrash = new JLabel(); 
      InputStream visible = getClass().getResourceAsStream("/eye_visible-16.png"); 
      InputStream invisible = getClass().getResourceAsStream("/eye_invisible-16.png"); 
      InputStream paint = getClass().getResourceAsStream("/paint-16.png"); 
      InputStream trash = getClass().getResourceAsStream("/trash-16.png"); 
      btnVisible.setIcon(new ImageIcon(ImageIO.read(visible))); 
      btnPaint.setIcon(new ImageIcon(ImageIO.read(paint))); 
      btnTrash.setIcon(new ImageIcon(ImageIO.read(trash))); 
      nomeRadar.addMouseListener(new MouseAdapter(){ 

       public void mouseClicked(MouseEvent e){ 
        System.out.println("clicou no nome"); 
       } 
      }); 
      btnVisible.addMouseListener(new MouseAdapter(){ 
       public void mouseClicked(MouseEvent e){ 
        System.out.println("clicou no olho"); 
       } 
      }); 
      btnPaint.addMouseListener(new MouseAdapter(){ 
       public void mouseClicked(MouseEvent e){ 
        System.out.println("clicou no paint"); 
       } 
      }); 
      btnTrash.addMouseListener(new MouseAdapter(){ 
       public void mouseClicked(MouseEvent e){ 
        System.out.println("clicou no trash"); 
       } 
      }); 
      renderer.add(nomeRadar); 
      renderer.add(btnVisible); 
      renderer.add(btnPaint); 
      renderer.add(btnTrash); 

     } 
     @Override 
     public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, 
       int row, boolean hasFocus) { 
      Component returnValue = null; 
      // TODO Auto-generated method stub 
      if ((value != null) && (value instanceof DefaultMutableTreeNode)) { 
       Object userObject = ((DefaultMutableTreeNode) value) 
         .getUserObject(); 
       if(userObject instanceof Book){ 
        Book feature = (Book) userObject; 
        nomeRadar.setText(feature.getTitulo()); 
        renderer.setEnabled(tree.isEnabled()); 
        returnValue = renderer; 
       } 
      } 
      if (returnValue == null) { 
       returnValue = defaultRenderer.getTreeCellRendererComponent(tree, 
         value, selected, expanded, leaf, row, hasFocus); 
      } 
      return returnValue; 
     } 

    } 
    public static class ButtonCellEditor extends AbstractCellEditor implements TreeCellEditor, ActionListener, MouseListener 
    { 
     /** 
     * 
     */ 
     private static final long serialVersionUID = 1L; 
     TreeCellEditor defaultEditor = JTreeOfObjects.currentStyle; 
     JLabel title; 
     JPanel renderer; 
     JLabel btnVisible; 
     JLabel btnPaint; 
     JLabel btnTrash; 
     private Object value; 

     public ButtonCellEditor() throws IOException{ 
      renderer = new JPanel(new FlowLayout(5, 5,5)); 
      System.out.println("ulo"); 
      title = new JLabel(); 
      renderer.add(title); 
      btnVisible = new JLabel(); 
      btnPaint = new JLabel(); 
      btnTrash = new JLabel(); 
      InputStream visible = getClass().getResourceAsStream("/eye_visible-16.png"); 
      InputStream invisible = getClass().getResourceAsStream("/eye_invisible-16.png"); 
      InputStream paint = getClass().getResourceAsStream("/paint-16.png"); 
      InputStream trash = getClass().getResourceAsStream("/trash-16.png"); 
      btnVisible.setIcon(new ImageIcon(ImageIO.read(visible))); 
      btnPaint.setIcon(new ImageIcon(ImageIO.read(paint))); 
      btnTrash.setIcon(new ImageIcon(ImageIO.read(trash))); 
      System.out.println("nossa 1"); 
      title.addMouseListener(new MouseAdapter(){ 

       public void mouseClicked(MouseEvent e){ 
        System.out.println("clicou no nome"); 
        stopCellEditing(); 
       } 
      }); 
      btnVisible.addMouseListener(new MouseAdapter(){ 
       public void mouseClicked(MouseEvent e){ 
        System.out.println("clicou no olho"); 
        stopCellEditing(); 
       } 
      }); 
      btnPaint.addMouseListener(new MouseAdapter(){ 
       public void mouseClicked(MouseEvent e){ 
        System.out.println("clicou no paint"); 
        stopCellEditing(); 
       } 
      }); 
      btnTrash.addMouseListener(new MouseAdapter(){ 
       public void mouseClicked(MouseEvent e){ 
        System.out.println("clicou no trash"); 
        stopCellEditing(); 
       } 
      }); 
      renderer.add(title); 
      renderer.add(btnVisible); 
      renderer.add(btnPaint); 
      renderer.add(btnTrash); 
     } 


     @Override 
     public Object getCellEditorValue() { 
      // TODO Auto-generated method stub 
      //return value.toString(); 
      return null; 
     } 


     @Override 
     public void mouseClicked(MouseEvent e) { 
      // TODO Auto-generated method stub 
      System.out.println("clicou no b"); 
      stopCellEditing(); 
     } 


     @Override 
     public void mouseEntered(MouseEvent e) { 
      // TODO Auto-generated method stub 

     } 


     @Override 
     public void mouseExited(MouseEvent e) { 
      // TODO Auto-generated method stub 

     } 


     @Override 
     public void mousePressed(MouseEvent e) { 
      // TODO Auto-generated method stub 
      System.out.println("clicou no d"); 
      stopCellEditing(); 
     } 


     @Override 
     public void mouseReleased(MouseEvent e) { 
      // TODO Auto-generated method stub 

     } 


     @Override 
     public void actionPerformed(ActionEvent e) { 
      // TODO Auto-generated method stub 
      System.out.println("clicou no a"); 
      stopCellEditing(); 

     } 


     @Override 
     public Component getTreeCellEditorComponent(JTree tree, Object value, boolean isSelected, boolean expanded, 
       boolean leaf, int row) { 
      Component returnValue = null; 
      System.out.println("loo"); 
      if ((value != null) && (value instanceof DefaultMutableTreeNode)) { 
       Object userObject = ((DefaultMutableTreeNode) value) 
         .getUserObject(); 
       System.out.println("b"); 
       if(userObject instanceof Book){ 
        Book feature = (Book) userObject; 
        title.setText(feature.getTitulo()); 
        renderer.setEnabled(tree.isEnabled()); 
        returnValue = renderer; 
        System.out.println("hi!!"); 
       } 
      } 
      if (returnValue == null) { 
       System.out.println("hi1"); 
       returnValue = defaultEditor.getTreeCellEditorComponent(tree, value, isSelected, expanded, leaf, row); 
       System.out.println(defaultEditor); 

      } 
      return returnValue; 
     } 


    } 
} 

Klasse JTreeOfObjects

public class JTreeOfObjects { 


    public static TreeCellRenderer renderer; 
    private JFrame frame; 
    public static JTree tree; 
    private DefaultTreeModel model; 
    private DefaultMutableTreeNode parent; 
    JLabel nomeRadar; 
    JLabel btnVisible; 
    JLabel btnPaint; 
    JLabel btnTrash; 
    public static TreeCellEditor currentStyle; 
    public void initialize() throws IOException{ 
     frame = new JFrame("Árvore de Navegação"); 
     parent = new DefaultMutableTreeNode("Library",true); 
     //DefaultMutableTreeNode undefined = new DefaultMutableTreeNode("Indefinida"); 
     //undefined.add(new DefaultMutableTreeNode("!")); 
     System.out.println(parent.getUserObject()); 

     //parent.add(undefined); 
     tree = new JTree(parent); 
     System.out.println("Current"+tree.getCellEditor()); 
     //currentStyle = tree.getCellEditor(); 
     renderer = new Render.NodeCellRenderer(); 
     model = (DefaultTreeModel) tree.getModel(); 

     tree.setEditable(true); 
     tree.setCellRenderer(renderer); 
     tree.setCellEditor(new Render.ButtonCellEditor()); 
     //frame.getContentPane().add(tree); 
     nomeRadar = new JLabel(); 
     btnVisible = new JLabel(); 
     btnPaint = new JLabel(); 
     btnTrash = new JLabel(); 
     InputStream visible = getClass().getResourceAsStream("/eye_visible-16.png"); 
     InputStream invisible = getClass().getResourceAsStream("/eye_invisible-16.png"); 
     InputStream paint = getClass().getResourceAsStream("/paint-16.png"); 
     InputStream trash = getClass().getResourceAsStream("/trash-16.png"); 
     btnVisible.setIcon(new ImageIcon(ImageIO.read(visible))); 
     btnPaint.setIcon(new ImageIcon(ImageIO.read(paint))); 
     btnTrash.setIcon(new ImageIcon(ImageIO.read(trash))); 
     frame.getContentPane().add(btnPaint); 
     frame.getContentPane().add(btnVisible); 
     frame.getContentPane().add(btnTrash); 
     frame.getContentPane().add(tree); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setUndecorated(true); 
     frame.getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG); 
     frame.setSize(200, 200); 
     frame.setVisible(true); 

    } 
    public void adicionarNoCamada(String nomePessoa){ 
     //DefaultTreeModel model = (DefaultTreeModel)tree.getModel(); 

     DefaultMutableTreeNode noCamada = new DefaultMutableTreeNode(nomePessoa); 
     parent.add(noCamada); 


    } 
    public void adicionarLivro(String nomeCamada,Book feature) throws IOException{ 
     //tree.get 
     DefaultMutableTreeNode node = null; 
     Enumeration e = parent.breadthFirstEnumeration(); 
     while(e.hasMoreElements()){ 
      node = (DefaultMutableTreeNode) e.nextElement(); 
      if(nomeCamada.equals(node.getUserObject().toString())){ 
       node.add(new DefaultMutableTreeNode(feature)); 
       break; 
      } 
      else{ 

      } 
     } 
     tree.setCellEditor(new Render.ButtonCellEditor()); 
    } 

} 

Klasse Haupt App

public class MainApp { 

    public static void main(String[] args) throws IOException { 
     // TODO Auto-generated method stub 
     Book b1 = new Book("The Book of Life"); 
     Book b2 = new Book ("The Book of Death"); 
     User u1 = new User("Bianca"); 
     JTreeOfObjects object = new JTreeOfObjects(); 
     object.initialize(); 
     object.adicionarNoCamada(u1.getNomeUser()); 
     object.adicionarLivro(u1.getNomeUser(), b1); 
     object.adicionarLivro(u1.getNomeUser(), b2); 

    } 

} 

Jede Hilfe geschätzt sehr würde. Es ist kein Duplikat, da ich weiß wie man eine NullPointer Exception repariert (muss das Objekt instatieren). Ich weiß einfach nicht, was ich im Falle eines TreeCellEditors zurückgeben soll, wie ich den Standard wiederherstellen kann.

Answer 1

Sie müssen möglicherweise CellEditor#isCellEditable(...) und CellEditor#getCellEditorValue() überschreiben, aber ich bin mir nicht sicher, dass dies Ihnen geben wird, was Sie wollen.

@Override public boolean isCellEditable(EventObject e) { 
    Object source = e.getSource(); 
    if (!(source instanceof JTree) || !(e instanceof MouseEvent)) { 
     return false; 
    } 
    JTree tree = (JTree) source; 
    Point p = ((MouseEvent) e).getPoint(); 
    Object node = tree.getPathForLocation(p.x, p.y).getLastPathComponent(); 
    if (!(node instanceof DefaultMutableTreeNode)) { 
     return false; 
    } 
    Object userObject = ((DefaultMutableTreeNode) node).getUserObject(); 
    if (!(userObject instanceof Book)) { 
     return false; 
    } 
    return super.isCellEditable(e); 
    } 

    @Override 
    public Object getCellEditorValue() { 
    return new Book(renderer.nomeRadar.getText()); 
    } 

Hier ist ein kurzes Beispiel:

import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 
import javax.swing.*; 
import javax.swing.tree.*; 

public class MainApp2 { 
    public JComponent makeUI() { 
    JTree tree = new JTree(makeModel()); 
    tree.setEditable(true); 
    tree.setCellRenderer(new NodeCellRenderer()); 
    tree.setCellEditor(new ButtonCellEditor()); 

    JPanel p = new JPanel(new BorderLayout()); 
    p.add(new JScrollPane(tree)); 
    return p; 
    } 
    private static DefaultMutableTreeNode makeModel() { 
    Book b1 = new Book("The Book of Life"); 
    Book b2 = new Book("The Book of Death"); 
    User u1 = new User("Bianca"); 

    DefaultMutableTreeNode noCamada = new DefaultMutableTreeNode(u1); 
    noCamada.add(new DefaultMutableTreeNode(b1)); 
    noCamada.add(new DefaultMutableTreeNode(b2)); 

    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Library", true); 
    root.add(noCamada); 
    return root; 
    } 
    public static void main(String[] args) { 
    EventQueue.invokeLater(() -> { 
     JFrame f = new JFrame("Arvore de Navegacao"); 
     f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     f.getContentPane().add(new MainApp2().makeUI()); 
     f.setSize(320, 240); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    }); 
    } 
} 

class NodePanel extends JPanel { 
    public final JLabel nomeRadar = new JLabel(); 
    public final JLabel btnVisible = new JLabel(new ColorIcon(Color.RED)); 
    public final JLabel btnPaint = new JLabel(new ColorIcon(Color.GREEN)); 
    public final JLabel btnTrash = new JLabel(new ColorIcon(Color.BLUE)); 
    protected NodePanel() { 
    super(new FlowLayout(FlowLayout.LEADING, 5, 5)); 
    add(nomeRadar); 
    add(btnVisible); 
    add(btnPaint); 
    add(btnTrash); 
    } 
} 

class NodeCellRenderer implements TreeCellRenderer { 
    private final DefaultTreeCellRenderer defaultRenderer = new DefaultTreeCellRenderer(); 
    private final NodePanel renderer = new NodePanel(); 

    @Override public Component getTreeCellRendererComponent(
     JTree tree, Object value, boolean selected, boolean expanded, 
     boolean leaf, int row, boolean hasFocus) { 
    Component returnValue = null; 
    if (value instanceof DefaultMutableTreeNode) { 
     Object userObject = ((DefaultMutableTreeNode) value).getUserObject(); 
     if (userObject instanceof Book) { 
     Book feature = (Book) userObject; 
     renderer.nomeRadar.setText(feature.getTitulo()); 
     returnValue = renderer; 
     } 
    } 
    if (returnValue == null) { 
     returnValue = defaultRenderer.getTreeCellRendererComponent(
      tree, value, selected, expanded, leaf, row, hasFocus); 
    } 
    return returnValue; 
    } 
} 

class ButtonCellEditor extends AbstractCellEditor implements TreeCellEditor { 
    private final DefaultTreeCellRenderer defaultRenderer = new DefaultTreeCellRenderer(); 
    private final NodePanel renderer = new NodePanel(); 

    public ButtonCellEditor() { 
    renderer.setBackground(Color.ORANGE); 
    renderer.nomeRadar.addMouseListener(new MouseAdapter() { 
     @Override public void mousePressed(MouseEvent e) { 
     System.out.println("clicou no nome"); 
     stopCellEditing(); 
     } 
    }); 
    renderer.btnVisible.addMouseListener(new MouseAdapter() { 
     @Override public void mousePressed(MouseEvent e) { 
     System.out.println("clicou no olho"); 
     stopCellEditing(); 
     } 
    }); 
    renderer.btnPaint.addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent e) { 
     System.out.println("clicou no paint"); 
     stopCellEditing(); 
     } 
    }); 
    renderer.btnTrash.addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent e) { 
     System.out.println("clicou no trash"); 
     stopCellEditing(); 
     } 
    }); 
    renderer.addMouseListener(new MouseAdapter() { 
     public void mousePressed(MouseEvent e) { 
     System.out.println("renderer"); 
     stopCellEditing(); 
     } 
    }); 
    } 

    @Override public boolean isCellEditable(EventObject e) { 
    Object source = e.getSource(); 
    if (!(source instanceof JTree) || !(e instanceof MouseEvent)) { 
     return false; 
    } 
    JTree tree = (JTree) source; 
    Point p = ((MouseEvent) e).getPoint(); 
    TreePath path = tree.getPathForLocation(p.x, p.y); 
    if (Objects.isNull(path)) { 
     return false; 
    } 
    Object node = path.getLastPathComponent(); 
    if (!(node instanceof DefaultMutableTreeNode)) { 
     return false; 
    } 
    Object userObject = ((DefaultMutableTreeNode) node).getUserObject(); 
    if (!(userObject instanceof Book)) { 
     return false; 
    } 
    return super.isCellEditable(e); 
    } 

    @Override 
    public Object getCellEditorValue() { 
    return new Book(renderer.nomeRadar.getText()); 
    } 

    @Override 
    public Component getTreeCellEditorComponent(
     JTree tree, Object value, boolean isSelected, boolean expanded, 
     boolean leaf, int row) { 
    Component returnValue = null; 
    if (value instanceof DefaultMutableTreeNode) { 
     Object userObject = ((DefaultMutableTreeNode) value).getUserObject(); 
     if (userObject instanceof Book) { 
     Book feature = (Book) userObject; 
     renderer.nomeRadar.setText(feature.getTitulo()); 
     returnValue = renderer; 
     } 
    } 
    if (returnValue == null) { 
     returnValue = defaultRenderer.getTreeCellRendererComponent(
      tree, value, isSelected, expanded, leaf, row, true); 
    } 
    return returnValue; 
    } 
} 

class Book { 
    String titulo; 
    public String getTitulo() { 
    return titulo; 
    } 
    public void setTitulo(String titulo) { 
    this.titulo = titulo; 
    } 
    public Book(String titulo) { 
    this.titulo = titulo; 
    } 
} 

class User { 
    String nomeUser; 
    public String getNomeUser() { 
    return nomeUser; 
    } 
    public void setNomeUser(String nomeUser) { 
    this.nomeUser = nomeUser; 
    } 
    public User(String nome) { 
    this.nomeUser = nome; 
    } 
    @Override public String toString() { 
    return nomeUser; 
    } 
} 

class ColorIcon implements Icon { 
    private final Color color; 
    protected ColorIcon(Color color) { 
    this.color = color; 
    } 
    @Override public void paintIcon(Component c, Graphics g, int x, int y) { 
    Graphics2D g2 = (Graphics2D) g.create(); 
    g2.translate(x, y); 
    g2.setPaint(color); 
    g2.fillRect(0, 0, getIconWidth(), getIconHeight()); 
    g2.dispose(); 
    } 
    @Override public int getIconWidth() { 
    return 16; 
    } 
    @Override public int getIconHeight() { 
    return 16; 
    } 
}