valuechangetrackingbooleanfieldeditor.java

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/**
 * Copyright (c) 2003-2005 Craig Setera
 * All Rights Reserved.
 * Licensed under the Eclipse Public License - v 1.0
 * For more information see http://www.eclipse.org/legal/epl-v10.html
 */
package eclipseme.ui.internal.utils;

import org.eclipse.jface.preference.BooleanFieldEditor;
import org.eclipse.jface.preference.StringFieldEditor;
import org.eclipse.swt.widgets.Composite;

/**
 * A BooleanFieldEditor subclass that enables and disables another
 * StringFieldEditor based on the state of the boolean field.
 * <p />
 * Copyright (c) 2003-2005 Craig Setera<br>
 * All Rights Reserved.<br>
 * Licensed under the Eclipse Public License - v 1.0<p/>
 * <br>
 * $Revision: 1.2 $
 * <br>
 * $Date: 2005/07/07 02:36:26 $
 * <br>
 * @author Craig Setera
 */
public class ValueChangeTrackingBooleanFieldEditor extends BooleanFieldEditor {
	private Composite parent;
	private StringFieldEditor fieldEditor;

	/**
	 * Construct a new tracking field editor.
	 * 
	 * @param name
	 * @param label
	 * @param parent
	 */
	public ValueChangeTrackingBooleanFieldEditor(
		String name,
		String label,
		Composite parent) 
	{
		super(name, label, parent);
		this.parent = parent;
	}

	/**
	 * @see org.eclipse.jface.preference.FieldEditor#doLoad()
	 */
	protected void doLoad() {
		super.doLoad();
		updateEditorEnablement();
	}

	/**
	 * Get the field editor
	 * @return
	 */
	public StringFieldEditor getFieldEditor() {
		return fieldEditor;
	}

	/**
	 * Set the field editor
	 * @param editor
	 */
	public void setFieldEditor(StringFieldEditor editor) {
		fieldEditor = editor;
	}

	/**
	 * Update the enablement of the field editor controls
	 * based on the current state of the boolean values. 
	 */
	private void updateEditorEnablement() {
		if (fieldEditor != null) {
			boolean value = getBooleanValue();
			fieldEditor.getLabelControl(parent).setEnabled(value);
			fieldEditor.getTextControl(parent).setEnabled(value);
		}
	}

	/**
	 * @see org.eclipse.jface.preference.BooleanFieldEditor#valueChanged(boolean, boolean)
	 */
	protected void valueChanged(boolean oldValue, boolean newValue) {
		super.valueChanged(oldValue, newValue);
		updateEditorEnablement();
	}
}