propertyeditorcontainer.java

报表设计软件,很好的

/**
 * ========================================
 * JFreeReport : a free Java report library
 * ========================================
 *
 * Project Info:  http://www.jfree.org/jfreereport/index.html
 * Project Lead:  Thomas Morgner ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Simba Management Limited and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * ------------------------------
 * PropertyEditorContainer.java
 * ------------------------------
 * (C)opyright 2003, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Simba Management Limited);
 *
 * $Id: PropertyEditorContainer.java,v 1.2 2004/04/20 18:55:01 taqua Exp $
 *
 * Changes
 * -------------------------
 * 25.10.2003 : Initial version
 *
 */

package org.jfree.designer.visualeditor.elementeditor;

import java.awt.BorderLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyEditor;
import javax.swing.JComponent;

import org.jfree.designer.propertyeditors.PropertyEditorUtil;
import org.jfree.report.util.Log;

public final class PropertyEditorContainer
        extends JComponent
{
  private final class PropertyChangeHandler
          implements PropertyChangeListener
  {
    /**
     * This method gets called when a bound property is changed.
     *
     * @param evt A PropertyChangeEvent object describing the event source and the
     *            property that has changed.
     */
    public final void propertyChange (final PropertyChangeEvent evt)
    {
      // property change event from the property editor
      // update the state...
      // Log.debug ("Gotcha: " + editor.getPropertyEditor().getValue());
      setValue(editor.getPropertyEditor().getValue());
    }
  }

  private DesignerPropertyEditor editor;
  private Object value;
  private boolean lock;

  public PropertyEditorContainer (final Class type)
  {
    final PropertyEditor ed = PropertyEditorUtil.findPropertyEditor(type);
    if (ed == null)
    {
      Log.warn("No editor for class " + type);
      return;
    }
    if (ed.getCustomEditor() != null)
    {
      editor = new GenericPaintablePropertyEditor(ed);
    }
    else if (ed.getTags() != null)
    {
      editor = new GenericTaggedPropertyEditor(ed);
    }
    else
    {
      editor = new GenericPropertyEditor(ed);
    }

    editor.getPropertyEditor().addPropertyChangeListener(new PropertyChangeHandler());
    setLayout(new BorderLayout());
    add(editor.getEditorComponent(), BorderLayout.CENTER);
  }

  /**
   * Sets whether or not this component is enabled. A component that is enabled may
   * respond to user input, while a component that is not enabled cannot respond to user
   * input.  Some components may alter their visual representation when they are disabled
   * in order to provide feedback to the user that they cannot take input. <p>Note:
   * Disabling a component does not disable it's children.
   * <p/>
   * <p>Note: Disabling a lightweight component does not prevent it from receiving
   * MouseEvents.
   *
   * @param enabled true if this component should be enabled, false otherwise
   * @see java.awt.Component#isEnabled
   * @see java.awt.Component#isLightweight
   */
  public final void setEnabled (final boolean enabled)
  {
    super.setEnabled(enabled);
    if (this.editor != null)
    {
      this.editor.setEnabled(enabled);
    }
  }

  public final Object getValue ()
  {
    return value;
  }

  public final synchronized void setValue (final Object value)
  {
    if (lock == true)
    {
      return;
    }
    // prevent a possible event loop ...
    lock = true;
    try
    {
      final Object oldValue = this.value;
      this.value = value;
      if (this.editor != null)
      {
        this.editor.getPropertyEditor().setValue(value);
      }
      firePropertyChange("value", oldValue, value);
    }
    finally
    {
      lock = false;
    }
  }
}