Java Tutorial/SWT/ControlEditor

Control Editors

ControlEditor offers basic control-editing abilities. It has three derived classes: TableEditor, TreeEditor, and TableTreeEditor.

import java.util.HashMap;
import java.util.Map;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ControlEditor;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class ControlEditorSample {
  private static final Map COLORS = new HashMap();
  static {
    COLORS.put("red", new RGB(255, 0, 0));
    COLORS.put("green", new RGB(0, 255, 0));
    COLORS.put("blue", new RGB(0, 0, 255));
    COLORS.put("yellow", new RGB(255, 255, 0));
    COLORS.put("black", new RGB(0, 0, 0));
    COLORS.put("white", new RGB(255, 255, 255));
  }
  static Display display = new Display();
  static Color color = new Color(display, 255, 0, 0);
  public static void main(String[] args) {
    final Shell shell = new Shell(display);
    shell.setText("Control Editor");
    final Composite composite = new Composite(shell, SWT.NONE);
    composite.setBackground(color);
    composite.setBounds(0, 0, 300, 100);
    ControlEditor editor = new ControlEditor(composite);
    final Text text = new Text(composite, SWT.BORDER);
    text.addModifyListener(new ModifyListener() {
      public void modifyText(ModifyEvent event) {
        RGB rgb = (RGB) COLORS.get(text.getText());
        if (rgb != null) {
          if (color != null)
            color.dispose();
          color = new Color(shell.getDisplay(), rgb);
          composite.setBackground(color);
        }
      }
    });
    // Place the editor in the top middle of the parent composite
    editor.horizontalAlignment = SWT.CENTER;
    editor.verticalAlignment = SWT.TOP;
    Point size = text.ruputeSize(SWT.DEFAULT, SWT.DEFAULT);
    editor.minimumWidth = size.x;
    editor.minimumHeight = size.y;
    editor.setEditor(text);
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    if (color != null)
      color.dispose();
    display.dispose();
  }
}

Control Editor With Dialog

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ControlEditor;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ColorDialog;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ControlEditorWithDialog {
  static Display display = new Display();
  static Color color = new Color(display, 255, 0, 0);
  public static void main(String[] args) {
    final Shell shell = new Shell(display);
    shell.setText("Control Editor Two");
    final Composite composite = new Composite(shell, SWT.NONE);
    composite.setBackground(color);
    composite.setBounds(0, 0, 300, 100);
    ControlEditor editor = new ControlEditor(composite);
    // Create the control associated with the editor
    Button button = new Button(composite, SWT.PUSH);
    button.setText("Change Color...");
    button.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        ColorDialog dialog = new ColorDialog(shell);
        if (color != null)
          dialog.setRGB(color.getRGB());
        RGB rgb = dialog.open();
        if (rgb != null) {
          if (color != null)
            color.dispose();
          color = new Color(shell.getDisplay(), rgb);
          composite.setBackground(color);
        }
      }
    });
    // Place the editor along the bottom of the parent composite
    editor.grabHorizontal = true;
    editor.verticalAlignment = SWT.BOTTOM;
    Point size = button.ruputeSize(SWT.DEFAULT, SWT.DEFAULT);
    editor.minimumHeight = size.y;
    editor.setEditor(button);
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    if (color != null)
      color.dispose();
    display.dispose();
  }
}