Using TreeEditor : Tree Editor « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. Tree Editor

1. A TreeEditor allows users to edit the text associated with a tree's nodes.
2. TreeEditor is derived from ControlEditor.
3. Its parent is always a Tree, which is passed in the constructor:

public TreeEditor(Tree parent)

1. Press F2 to edit the selected item.
2. While editing, press Enter to accept the changes and stop editing.
3. While editing, press Escape to throw away the changes and stop editing.

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TreeEditor;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;

public class TreeEditorSampleDemo {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Text Tree Editor");
    shell.setLayout(new FillLayout());

    final Tree tree = new Tree(shell, SWT.SINGLE);
    for (int i = 0; i < 3; i++) {
      TreeItem iItem = new TreeItem(tree, SWT.NONE);
      iItem.setText("Item " + (i + 1));
      for (int j = 0; j < 3; j++) {
        TreeItem jItem = new TreeItem(iItem, SWT.NONE);
        jItem.setText("Sub Item " + (j + 1));
        for (int k = 0; k < 3; k++) {
          new TreeItem(jItem, SWT.NONE).setText("Sub Sub Item " + (k + 1));
        }
        jItem.setExpanded(true);
      }
      iItem.setExpanded(true);
    }

    final TreeEditor editor = new TreeEditor(tree);
    editor.horizontalAlignment = SWT.LEFT;
    editor.grabHorizontal = true;

    tree.addKeyListener(new KeyAdapter() {
      public void keyPressed(KeyEvent event) {
        if (event.keyCode == SWT.F2 && tree.getSelectionCount() == 1) {
          final TreeItem item = tree.getSelection()[0];

          final Text text = new Text(tree, SWT.NONE);
          text.setText(item.getText());
          text.selectAll();
          text.setFocus();

          text.addFocusListener(new FocusAdapter() {
            public void focusLost(FocusEvent event) {
              item.setText(text.getText());
              text.dispose();
            }
          });

          text.addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent event) {
              switch (event.keyCode) {
              case SWT.CR:
                item.setText(text.getText());
              case SWT.ESC:
                text.dispose();
                break;
              }
            }
          });
          editor.setEditor(text, item);
        }
      }
    });

    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}

17.59.Tree Editor
	17.59.1.	Using TreeEditor
	17.59.2.	Use Text as the Table Cell Editor
	17.59.3.	Exchanging Data
	17.59.4.	Press F2 to launch a dialog as the Tree Editor
	17.59.5.	Use Mouse action to activate(install) Tree editor
	17.59.6.	Use Button as the Tree Editor
	17.59.7.	Add Tree cell editor