200分求助：SWT中定制TreeView的问题。（解决后，另开贴送分）

看了一下，估计比较麻烦。我先说说我的想法。1. 继承org.elcipse.swt.widgets.Tree, 写一个Tree的子类。重写createItem()方法, 返回步骤2中定义的TreeItem子类。
2. 继承org.eclipse.swt.widgets.TreeItem, 写一个TreeItem的子类。在TreeItem类中决定是否显示Checkbox.
3.继承CheckboxTreeViewer, 在构造方法中创建步骤1中定义的Tree子类。没有仔细想，权当作参考吧。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import com.incors.plaf.alloy.*;//组件的下载网址http://www.incors.com/lookandfeel/
/*将alloy.jar放在c:\j2sdk1.4.0\jre\lib\ext\目录下.
*/
public class TreeDemo3
{
    public TreeDemo3()
    {
        JFrame f = new JFrame("TreeDemo");
        Container contentPane = f.getContentPane();


        DefaultMutableTreeNode root = new DefaultMutableTreeNode("资源管理器");
        DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("我的公文包");
        DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("我的电脑");
        DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("收藏夹");
        DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Readme");

        DefaultTreeModel treeModel = new DefaultTreeModel(root);        /*DefaultTreeModel类所提供的insertNodeInto()方法加入节点到父节点的数量.
         *利用DefaultMutableTreeNode类所提供的getChildCount()方法取得目前子节点的数量.
         */
        treeModel.insertNodeInto(node1, root, root.getChildCount());
        treeModel.insertNodeInto(node2, root, root.getChildCount());
        treeModel.insertNodeInto(node3, root, root.getChildCount());
        treeModel.insertNodeInto(node4, root, root.getChildCount());

        DefaultMutableTreeNode leafnode = new
                DefaultMutableTreeNode("公司文件");        //DefaultTreeModel类所提供的insertNodeInto()方法加入节点到父节点的数量.
        treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());
        leafnode = new DefaultMutableTreeNode("个人信件");
        treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());
        leafnode = new DefaultMutableTreeNode("私人文件");
        treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());

        leafnode = new DefaultMutableTreeNode("本机磁盘(C:)");
        treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());
        leafnode = new DefaultMutableTreeNode("本机磁盘(D:)");
        treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());
        leafnode = new DefaultMutableTreeNode("本机磁盘(E:)");
        treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());

        DefaultMutableTreeNode node31 = new DefaultMutableTreeNode("网站列表");
        treeModel.insertNodeInto(node31, node3, node3.getChildCount());
        leafnode = new DefaultMutableTreeNode("奇摩站");
        treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());
        leafnode = new DefaultMutableTreeNode("职棒消息");
        treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());
        leafnode = new DefaultMutableTreeNode("网络书店");
        treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());
        try {
           LookAndFeel alloyLnF = new AlloyLookAndFeel();
           UIManager.setLookAndFeel(alloyLnF);
        } catch (UnsupportedLookAndFeelException ex) {
        // You may handle the exception here
        }
         // this line needs to be implemented in order to make JWS work properly
          UIManager.getLookAndFeelDefaults().put("ClassLoader", getClass().getClassLoader());

        //以TreeModel建立JTree。
        JTree tree = new JTree(treeModel);
        /*改变JTree的外观**/
          tree.putClientProperty("JTree.lineStyle","Horizontal");
        /*改变JTree的外观**/
        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setViewportView(tree);

        contentPane.add(scrollPane);
        f.pack();
        f.setVisible(true);

        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });    }    public static void main(String args[]) {

        new TreeDemo3();
    }
}

以上的代码实现了在tree node上显示节点的功能，继承它，然后把节点改为checkbox显示。
希望对楼主有帮助

congliu兄，谢谢！我们用的是SWT而不是SWING。汗。:)mr_yanfei(晏斐) 兄，谢谢，正在考虑如何实现，痛苦。

import org.eclipse.jface.viewers.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;/**
* This class demonstrates the CheckboxTreeViewer
*/
public class CheckFileTree extends FileTree {
  /**
   * Configures the shell
   *
   * @param shell the shell
   */
  protected void configureShell(Shell shell) {
    super.configureShell(shell);
    shell.setText("Check File Tree");
  }  /**
   * Creates the main window's contents
   *
   * @param parent the main window
   * @return Control
   */
  protected Control createContents(Composite parent) {
    Composite composite = new Composite(parent, SWT.NONE);
    composite.setLayout(new GridLayout(1, false));    // Add a checkbox to toggle whether the labels preserve case
    Button preserveCase = new Button(composite, SWT.CHECK);
    preserveCase.setText("&Preserve case");    // Create the tree viewer to display the file tree
    final CheckboxTreeViewer tv = new CheckboxTreeViewer(composite);
    tv.getTree().setLayoutData(new GridData(GridData.FILL_BOTH));
    tv.setContentProvider(new FileTreeContentProvider());
    tv.setLabelProvider(new FileTreeLabelProvider());
    tv.setInput("root"); // pass a non-null that will be ignored    // When user checks the checkbox, toggle the preserve case attribute
    // of the label provider
    preserveCase.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        boolean preserveCase = ((Button) event.widget).getSelection();
        FileTreeLabelProvider ftlp = (FileTreeLabelProvider) tv
            .getLabelProvider();
        ftlp.setPreserveCase(preserveCase);
      }
    });    // When user checks a checkbox in the tree, check all its children
    tv.addCheckStateListener(new ICheckStateListener() {
      public void checkStateChanged(CheckStateChangedEvent event) {
        // If the item is checked . . .
        if (event.getChecked()) {
          // . . . check all its children
          tv.setSubtreeChecked(event.getElement(), true);
        }
      }
    });
    return composite;
  }  /**
   * The application entry point
   *
   * @param args the command line arguments
   */
  public static void main(String[] args) {
    new CheckFileTree().run();
  }
}

import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;/**
* This class demonstrates TreeViewer. It shows the drives, directories, and files
* on the system.
*/
public class FileTree extends ApplicationWindow {
  /**
   * FileTree constructor
   */
  public FileTree() {
    super(null);
  }  /**
   * Runs the application
   */
  public void run() {
    // Don't return from open() until window closes
    setBlockOnOpen(true);    // Open the main window
    open();    // Dispose the display
    Display.getCurrent().dispose();
  }  /**
   * Configures the shell
   *
   * @param shell the shell
   */
  protected void configureShell(Shell shell) {
    super.configureShell(shell);    // Set the title bar text and the size
    shell.setText("File Tree");
    shell.setSize(400, 400);
  }  /**
   * Creates the main window's contents
   *
   * @param parent the main window
   * @return Control
   */
  protected Control createContents(Composite parent) {
    Composite composite = new Composite(parent, SWT.NONE);
    composite.setLayout(new GridLayout(1, false));    // Add a checkbox to toggle whether the labels preserve case
    Button preserveCase = new Button(composite, SWT.CHECK);
    preserveCase.setText("&Preserve case");    // Create the tree viewer to display the file tree
    final TreeViewer tv = new TreeViewer(composite);
    tv.getTree().setLayoutData(new GridData(GridData.FILL_BOTH));
    tv.setContentProvider(new FileTreeContentProvider());
    tv.setLabelProvider(new FileTreeLabelProvider());
    tv.setInput("root"); // pass a non-null that will be ignored    // When user checks the checkbox, toggle the preserve case attribute
    // of the label provider
    preserveCase.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        boolean preserveCase = ((Button) event.widget).getSelection();
        FileTreeLabelProvider ftlp = (FileTreeLabelProvider) tv
            .getLabelProvider();
        ftlp.setPreserveCase(preserveCase);
      }
    });
    return composite;
  }  /**
   * The application entry point
   *
   * @param args the command line arguments
   */
  public static void main(String[] args) {
    new FileTree().run();
  }
}

import java.io.*;import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;/**
* This class provides the content for the tree in FileTree
*/
public class FileTreeContentProvider implements ITreeContentProvider {
  /**
   * Gets the children of the specified object
   *
   * @param arg0 the parent object
   * @return Object[]
   */
  public Object[] getChildren(Object arg0) {
    // Return the files and subdirectories in this directory
    return ((File) arg0).listFiles();
  }  /**
   * Gets the parent of the specified object
   *
   * @param arg0 the object
   * @return Object
   */
  public Object getParent(Object arg0) {
    // Return this file's parent file
    return ((File) arg0).getParentFile();
  }  /**
   * Returns whether the passed object has children
   *
   * @param arg0 the parent object
   * @return boolean
   */
  public boolean hasChildren(Object arg0) {
    // Get the children
    Object[] obj = getChildren(arg0);    // Return whether the parent has children
    return obj == null ? false : obj.length > 0;
  }  /**
   * Gets the root element(s) of the tree
   *
   * @param arg0 the input data
   * @return Object[]
   */
  public Object[] getElements(Object arg0) {
    // These are the root elements of the tree
    // We don't care what arg0 is, because we just want all
    // the root nodes in the file system
    return File.listRoots();
  }  /**
   * Disposes any created resources
   */
  public void dispose() {
  // Nothing to dispose
  }  /**
   * Called when the input changes
   *
   * @param arg0 the viewer
   * @param arg1 the old input
   * @param arg2 the new input
   */
  public void inputChanged(Viewer arg0, Object arg1, Object arg2) {
  // Nothing to change
  }
}

java_augur(听着音乐) 兄，
这是标准的用法，没有定制显示或不显示CheckBox啊。呵呵。

final CheckboxTreeViewer tv = new CheckboxTreeViewer(composite);
final TreeViewer tv = new TreeViewer(composite);
一个是有，一个是没有。
一共四个文件，一次只能贴三个，
今天补全，你可能用不到，可能别人用得着。
仔细理解一下，可能就会找到答案。

import java.io.*;
import java.util.*;import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.eclipse.swt.graphics.Image;/**
* This class provides the labels for the file tree
*/
public class FileTreeLabelProvider implements ILabelProvider {
  // The listeners
  private List listeners;  // Images for tree nodes
  private Image file;
  private Image dir;  // Label provider state: preserve case of file names/directories
  boolean preserveCase;  /**
   * Constructs a FileTreeLabelProvider
   */
  public FileTreeLabelProvider() {
    // Create the list to hold the listeners
    listeners = new ArrayList();    // Create the images
    try {
      file = new Image(null, new FileInputStream("images/file.gif"));
      dir = new Image(null, new FileInputStream("images/directory.gif"));
    } catch (FileNotFoundException e) {
      // Swallow it; we'll do without images
    }
  }  /**
   * Sets the preserve case attribute
   *
   * @param preserveCase the preserve case attribute
   */
  public void setPreserveCase(boolean preserveCase) {
    this.preserveCase = preserveCase;    // Since this attribute affects how the labels are computed,
    // notify all the listeners of the change.
    LabelProviderChangedEvent event = new LabelProviderChangedEvent(this);
    for (int i = 0, n = listeners.size(); i < n; i++) {
      ILabelProviderListener ilpl = (ILabelProviderListener) listeners.get(i);
      ilpl.labelProviderChanged(event);
    }
  }  /**
   * Gets the image to display for a node in the tree
   *
   * @param arg0 the node
   * @return Image
   */
  public Image getImage(Object arg0) {
    // If the node represents a directory, return the directory image.
    // Otherwise, return the file image.
    return ((File) arg0).isDirectory() ? dir : file;
  }  /**
   * Gets the text to display for a node in the tree
   *
   * @param arg0 the node
   * @return String
   */
  public String getText(Object arg0) {
    // Get the name of the file
    String text = ((File) arg0).getName();    // If name is blank, get the path
    if (text.length() == 0) {
      text = ((File) arg0).getPath();
    }    // Check the case settings before returning the text
    return preserveCase ? text : text.toUpperCase();
  }  /**
   * Adds a listener to this label provider
   *
   * @param arg0 the listener
   */
  public void addListener(ILabelProviderListener arg0) {
    listeners.add(arg0);
  }  /**
   * Called when this LabelProvider is being disposed
   */
  public void dispose() {
    // Dispose the images
    if (dir != null) dir.dispose();
    if (file != null) file.dispose();
  }  /**
   * Returns whether changes to the specified property on the specified element
   * would affect the label for the element
   *
   * @param arg0 the element
   * @param arg1 the property
   * @return boolean
   */
  public boolean isLabelProperty(Object arg0, String arg1) {
    return false;
  }  /**
   * Removes the listener
   *
   * @param arg0 the listener to remove
   */
  public void removeListener(ILabelProviderListener arg0) {
    listeners.remove(arg0);
  }
}

java_augur(听着音乐) 兄，
这是The Definitive Guide to SWT and JFace一书的源码吧。我看了。问题是，我需要定制一个TREE，可以让它显示或不显示ITEM的复选框。呵呵。

调试易

200分求助：SWT中定制TreeView的问题。（解决后，另开贴送分）

解决方案 »