textbinding.java

来自「java实现浏览器等本地桌面的功能」· Java 代码 · 共 152 行

/*
 * $Id: TextBinding.java,v 1.2 2005/10/10 17:00:56 rbair Exp $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

package org.jdesktop.binding.swingx;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JComponent;
import javax.swing.UIManager;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;

import org.jdesktop.binding.DataModel;


/**
 * Class which binds a component that supports editing text values
 * (JTextField, JTextArea, JEditorPane) to a data model field. <p>
 * 
 * JW: hmm, what's the use case? I would prefer to better not do it now, 
 * can cope with that later if necessary.
 * 
 * [Although this binding is most commonly used for Swing's text
 * components, it may be used with any component that defines a
 * <code>javax.swing.text.Document</code> to represent its contents.]
 * 
 * @author Amy Fowler
 * @version 1.0
 */
public class TextBinding extends AbstractBinding {
    private JComponent component;
    private Document document;

    public TextBinding(JTextComponent textComponent,
                            DataModel model, String fieldName) {
        super(textComponent, model, fieldName, AbstractBinding.AUTO_VALIDATE);
        initDocument(textComponent.getDocument());
    }

    public TextBinding(JTextComponent textComponent,
                            DataModel model, String fieldName,
                           int validationPolicy) {
        super(textComponent, model, fieldName, validationPolicy);
        initDocument(textComponent.getDocument());
    }

    public TextBinding(JComponent component, Document document,
                            DataModel dataModel, String fieldName,
                            int validationPolicy) {
        super(component, dataModel, fieldName, validationPolicy);
        initDocument(document);
    }

    public JComponent getComponent() {
        return component;
    }

    protected void setComponent(JComponent component) {
        this.component = component;
        configureEditability();
    }

    protected void configureEditability() {
        if (!(component instanceof JTextComponent)) return;
        JTextComponent textComponent = (JTextComponent) component;
        textComponent.setEditable(!metaData.isReadOnly());
        
    }

    protected void installMetaDataListener() {
        PropertyChangeListener l = new PropertyChangeListener() {

            public void propertyChange(PropertyChangeEvent evt) {
                if ("readOnly".equals(evt.getPropertyName())) {
                    configureEditability();
                }
                
            }
            
        };
//        if (metaData != null) {
            metaData.addPropertyChangeListener(l); 
//        }
    }

    protected Object getComponentValue() {
        String txt;
        try {
            txt = document.getText(0, document.getLength());
        }
        catch (BadLocationException e) {
            txt = null;
        }
        return txt;
    }

    protected void setComponentValue(Object value) {
        try {
            document.remove(0, document.getLength());
            document.insertString(0, convertFromModelType(value), null);
        }
        catch (BadLocationException e) {
            UIManager.getLookAndFeel().provideErrorFeedback(component);
        }

    }

    private void initDocument(Document document) {
        this.document = document;
        document.addDocumentListener(new DocumentListener() {
            public void changedUpdate(DocumentEvent e) {
                maybeModified();
            }

            public void insertUpdate(DocumentEvent e) {
                maybeModified();
            }

            public void removeUpdate(DocumentEvent e) {
                maybeModified();
            }

            public void maybeModified() {
                if (!pulling) {
                    setModified(true);
                }
            }
        });
    }
}