在同一JTree中使用兩個不同對象時，JTree和CellEditor無法正常工作

我目前遇到JTree的單元編輯器有問題。我的JTree，用戶和書籍中有兩個不同的對象。在同一JTree中使用兩個不同對象時，JTree和CellEditor無法正常工作

所以用戶比安卡和書籍的節點。這些節點內的標籤（眼睛，油漆標籤和垃圾桶）也可點擊。但是，當我設置我的單元格編輯器時，它給了我一個空的異常。我認爲這是因爲我正在處理兩個不同的對象，所以我無法正確設置單元格編輯器。這是我覺得我有這個問題的具體方法：

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; 
}

我不知道如何返回DefaultCellEditor當節點的類型不是書。

下面是我的全部代碼，如果有人想複製的問題：

類圖書：

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; 
    } 
}

類用戶

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; 
    } 
}

級渲染（用於設置單元格編輯器和JTree的單元格渲染）

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; 
     } 


    } 
}

個

類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()); 
    } 

}

類主要應用

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); 

    } 

}

任何幫助將不勝感激。它不是重複的，因爲我知道如何修復NullPointer異常（必須安裝對象）。我只是不知道在TreeCellEditor的情況下返回什麼，如何返回它的默認值。

來源

2017-03-15 R. Natalie

您可能需要覆蓋CellEditor#isCellEditable(...)和CellEditor#getCellEditorValue()，但我不確定這會給你想要的。

@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()); 
    }

這裏有一個簡單的例子：

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; 
    } 
}

來源

2017-03-16 12:35:16 aterai

棚子裏淡了很多要解決的問題。我會做進一步的測試，並會更新答案。非常感謝！！ –

在同一JTree中使用兩個不同對象時，JTree和CellEditor無法正常工作

回答

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