Builds an editor that copies data from the domain back and forth : Data Binding « Swing Components « Java
Builds an editor that copies data from the domain back and forth
/*
* Copyright (c) 2002-2005 JGoodies Karsten Lentzsch. All Rights Reserved.
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* o Redistributions in binary form must reproduce the above copyright notice,
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* o Neither the name of JGoodies Karsten Lentzsch nor the names of
* its contributors may be used to endorse or promote products derived
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package com.jgoodies.binding.tutorial.basics;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.text.JTextComponent;
import com.jgoodies.binding.tutorial.Album;
import com.jgoodies.binding.tutorial.TutorialUtils;
import com.jgoodies.forms.builder.PanelBuilder;
import com.jgoodies.forms.factories.ButtonBarFactory;
import com.jgoodies.forms.layout.CellConstraints;
import com.jgoodies.forms.layout.FormLayout;
/**
* Builds an editor that copies data from the domain back and forth.
* This approach is known as the "copying" approach or "push/pull".<p>
*
* The event handling used to enable and disable the composer text field
* is invoked by a ChangeListener that hooks into the classical check box.
* Note that this lacks the domain logic, where the composer is set to
* <code>null</code> if the classical property is set to false.
* This logic is deferred until the component values are written to the
* edited Album via <code>#updateModel</code> when OK is pressed.
*
* @author Karsten Lentzsch
* @version $Revision: 1.6 $
*/
public class EditorCopyingExample {
/**
* Refers to the Album that is to be edited by this example editor.
*/
private final Album editedAlbum;
private JTextComponent titleField;
private JTextComponent artistField;
private JCheckBox classicalBox;
private JTextComponent composerField;
private JButton okButton;
private JButton cancelButton;
private JButton resetButton;
// Launching **************************************************************
public static void main(String[] args) {
try {
UIManager.setLookAndFeel("com.jgoodies.looks.plastic.PlasticXPLookAndFeel");
} catch (Exception e) {
// Likely PlasticXP is not in the class path; ignore.
}
JFrame frame = new JFrame();
frame.setTitle("Binding Tutorial :: Editor (Copying)");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
EditorCopyingExample example = new EditorCopyingExample();
JComponent panel = example.build();
example.updateView();
frame.getContentPane().add(panel);
frame.pack();
TutorialUtils.locateOnScreenCenter(frame);
frame.setVisible(true);
}
// Instance Creation ******************************************************
/**
* Constructs an editor for an example Album.
*/
public EditorCopyingExample() {
this(Album.ALBUM1);
}
/**
* Constructs an editor for an Album to be edited.
*
* @param album the Album to be edited
*/
public EditorCopyingExample(Album album) {
this.editedAlbum = album;
}
// Initialization *********************************************************
/**
* Creates and intializes the UI components.
*/
private void initComponents() {
titleField = new JTextField();
artistField = new JTextField();
classicalBox = new JCheckBox("Classical");
composerField = new JTextField();
okButton = new JButton(new OKAction());
cancelButton = new JButton(new CancelAction());
resetButton = new JButton(new ResetAction());
updateComposerField();
}
/**
* Observes the classical check box to update the composer field's
* enablement and contents. For demonstration purposes a listener
* is registered that writes all changes to the console.
*/
private void initEventHandling() {
classicalBox.addChangeListener(new ClassicalChangeHandler());
// Report changes in all bound Album properties.
editedAlbum.addPropertyChangeListener(
TutorialUtils.createDebugPropertyChangeListener());
}
// Copying Data Back and Forth ********************************************
/**
* Reads the property values from the edited Album
* and sets them in this editor's components.
*/
private void updateView() {
titleField.setText(editedAlbum.getTitle());
artistField.setText(editedAlbum.getArtist());
classicalBox.setSelected(editedAlbum.isClassical());
composerField.setText(editedAlbum.getComposer());
}
/**
* Reads the values from this editor's components
* and set the associated Album properties.
*/
private void updateModel() {
editedAlbum.setTitle(titleField.getText());
editedAlbum.setArtist(artistField.getText());
editedAlbum.setClassical(classicalBox.isSelected());
editedAlbum.setComposer(composerField.getText());
}
// Building ***************************************************************
/**
* Builds and returns the editor panel.
*
* @return the built panel
*/
public JComponent build() {
initComponents();
initEventHandling();
FormLayout layout = new FormLayout(
"right:pref, 3dlu, 150dlu:grow",
"p, 3dlu, p, 3dlu, p, 3dlu, p, 9dlu, p");
PanelBuilder builder = new PanelBuilder(layout);
builder.setDefaultDialogBorder();
CellConstraints cc = new CellConstraints();
builder.addLabel("Title", cc.xy (1, 1));
builder.add(titleField, cc.xy (3, 1));
builder.addLabel("Artist", cc.xy (1, 3));
builder.add(artistField, cc.xy (3, 3));
builder.add(classicalBox, cc.xy (3, 5));
builder.addLabel("Composer", cc.xy (1, 7));
builder.add(composerField, cc.xy (3, 7));
builder.add(buildButtonBar(), cc.xyw(1, 9, 3));
return builder.getPanel();
}
private JComponent buildButtonBar() {
return ButtonBarFactory.buildRightAlignedBar(
okButton, cancelButton, resetButton);
}
// Event Handling *********************************************************
/**
* Updates the composer field's enablement and contents.
* Sets the enablement according to the selection state
* of the classical check box. If the composer is not enabled,
* we copy the domain logic and clear the composer field's text.
*/
private void updateComposerField() {
boolean composerEnabled = classicalBox.isSelected();
composerField.setEnabled(composerEnabled);
if (!composerEnabled) {
composerField.setText("");
}
}
private class ClassicalChangeHandler implements ChangeListener {
/**
* The selection state of the classical check box has changed.
* Updates the enablement and contents of the composer field.
*/
public void stateChanged(ChangeEvent evt) {
updateComposerField();
}
}
// Actions ****************************************************************
private final class OKAction extends AbstractAction {
private OKAction() {
super("OK");
}
public void actionPerformed(ActionEvent e) {
updateModel();
System.out.println(editedAlbum);
System.exit(0);
}
}
private final class CancelAction extends AbstractAction {
private CancelAction() {
super("Cancel");
}
public void actionPerformed(ActionEvent e) {
// Just ignore the current content.
System.out.println(editedAlbum);
System.exit(0);
}
}
private final class ResetAction extends AbstractAction {
private ResetAction() {
super("Reset");
}
public void actionPerformed(ActionEvent e) {
updateView();
System.out.println(editedAlbum);
}
}
}
binding.zip( 506 k)
