Source Code : Wide Editor Tree Example

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Wide Editor Tree Example

// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html

/*  
 * 
 * This example works only each Icon has same width.
 *
 * editing JTextField has minimum 100. (swing1.1beta3) swing#1007
 *
 */

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellEditor;
import javax.swing.tree.TreePath;
//


/**
 * @version 1.0 11/09/98
 */

public class WideEditorTreeExample extends JFrame {
  public WideEditorTreeExample() {
    super("Wide Editor JTree Example");
    String[] strs = { "swing", // 0
        "plaf", // 1
        "basic", // 2
        "metal", // 3
        "JTree" }; // 4
    DefaultMutableTreeNode[] nodes = new DefaultMutableTreeNode[strs.length];
    for (int i = 0; i < strs.length; i++)
      nodes[i] = new DefaultMutableTreeNode(strs[i]);
    nodes[0].add(nodes[1]);
    nodes[1].add(nodes[2]);
    nodes[1].add(nodes[3]);
    nodes[0].add(nodes[4]);
    JTree tree = new JTree(nodes[0]);
    tree.setEditable(true);

    /*
     * swing1.0.3 tree.setCellEditor(new BasicTreeCellEditor(
     * (BasicTreeCellRenderer)tree.getCellRenderer()) { public void
     * doLayout() { if (editor != null) { Dimension cSize = getSize();
     * Dimension eSize = editor.getPreferredSize(); int n =
     * lastPath.getPathCount(); Rectangle r = new Rectangle(); r =
     * changeTree.getBounds(r); eSize.width = r.width -(editingOffset *n);
     * editor.setSize(eSize); editor.setLocation(editingOffset, 0);
     * editor.setBounds(editingOffset, 0, eSize.width, cSize.height);
     * setSize(new Dimension(eSize.width + editingOffset, cSize.height)); } } } );
     */

    // swing1.1beta3
    tree.setCellEditor(new WideCellEditor(tree,
        (DefaultTreeCellRenderer) tree.getCellRenderer()));
    //

    JScrollPane sp = new JScrollPane(tree);
    getContentPane().add(sp, BorderLayout.CENTER);
  }

  public static void main(String args[]) {
    try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    } catch (Exception evt) {}
  
    WideEditorTreeExample frame = new WideEditorTreeExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}

class WideCellEditor extends DefaultTreeCellEditor {

  public WideCellEditor(JTree tree, DefaultTreeCellRenderer renderer) {
    this(tree, renderer, null);
  }

  public WideCellEditor(final JTree tree,
      final DefaultTreeCellRenderer renderer, TreeCellEditor editor) {
    super(tree, renderer, editor);
    editingContainer = new WideEditorContainer();
  }

  public Component getTreeCellEditorComponent(JTree tree, Object value,
      boolean isSelected, boolean expanded, boolean leaf, int row) {
    Component c = super.getTreeCellEditorComponent(tree, value, isSelected,
        expanded, leaf, row);
    ((WideEditorContainer) editingContainer).setLocalCopy(tree, lastPath,
        offset, editingComponent);
    return c;
  }

  class WideEditorContainer extends DefaultTreeCellEditor.EditorContainer {
    JTree tree;

    TreePath lastPath;

    int offset;

    Component editingComponent;

    public void doLayout() {
      if (editingComponent != null) {
        Dimension cSize = getSize();
        Dimension eSize = editingComponent.getPreferredSize();
        int n = lastPath.getPathCount();
        Rectangle r = new Rectangle();
        r = tree.getBounds(r);
        eSize.width = r.width - (offset * n);
        editingComponent.setSize(eSize);
        editingComponent.setLocation(offset, 0);
        editingComponent
            .setBounds(offset, 0, eSize.width, cSize.height);
        setSize(new Dimension(eSize.width + offset, cSize.height));
      }
    }

    void setLocalCopy(JTree tree, TreePath lastPath, int offset,
        Component editingComponent) {
      this.tree = tree;
      this.lastPath = lastPath;
      this.offset = offset;
      this.editingComponent = editingComponent;
    }
  }
}


           
       

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