How to defer updates of a details view
after selecting an element in a master list
/*
* Copyright (c) 2002-2005 JGoodies Karsten Lentzsch. All Rights Reserved.
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package com.jgoodies.binding.tutorial.extras;
import java.util.List;
import javax.swing.*;
import javax.swing.text.JTextComponent;
import com.jgoodies.binding.PresentationModel;
import com.jgoodies.binding.adapter.BasicComponentFactory;
import com.jgoodies.binding.extras.DelayedReadValueModel;
import com.jgoodies.binding.list.SelectionInList;
import com.jgoodies.binding.tutorial.Album;
import com.jgoodies.binding.tutorial.TutorialUtils;
import com.jgoodies.binding.value.ConverterFactory;
import com.jgoodies.forms.builder.PanelBuilder;
import com.jgoodies.forms.factories.ButtonBarFactory;
import com.jgoodies.forms.layout.CellConstraints;
import com.jgoodies.forms.layout.FormLayout;
/**
* Demonstrates an elegant means how to defer updates of a details view
* after selecting an element in a master list. This can be useful
* if changing the details requires time consuming additional operations,
* for example a database lookup, a heavy computation, or a remote access.<p>
*
* This class builds a JList of Albums with an attached details panel
* that presents the current Album selection. The details panel's components
* are bound to the domain using ValueModels returned by a PresentationModel.
* The master JList is bound to a SelectionInList that holds the list of Albums
* and the currently selected Album. The SelectionInList is used as bean channel
* for the details PresentationModel. And so, whenever the SelectionInList's
* selection changes, the details PresentationModel will automatically update
* the bean used to display the details.<p>
*
* This example implements the deferred details update by using a delayed
* version of the SelectionInList as the presentation model's bean channel.
* Changes in the SelectionInList's selecion are held back for a specified delay
* before the selection becomes the presentation model's new bean.
*
* @author Karsten Lentzsch
* @version $Revision: 1.3 $
*
* @see #initComponents()
* @see DelayedReadValueModel
* @see com.jgoodies.binding.PresentationModel
* @see com.jgoodies.binding.tutorial.basics.MasterDetailsSelectionInListExample
*/
public class MasterDetailsDelayedReadExample {
/**
* The default in milliseconds to wait before a selection change
* shall be forwarded to the delayed details presentation model.
*/
private static final int DEFAULT_DELAY = 1000;
/**
* Holds the list of Albums plus a single selection.
*/
private final SelectionInList albumSelection;
/**
* Holds the selected Album and vends ValueModels that adapt Album properties.
*/
private final PresentationModel detailsModel;
private JList albumsList;
private JTextComponent titleField;
private JTextComponent artistField;
private JTextComponent classicalField;
private JTextComponent composerField;
private JButton closeButton;
// 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 :: Master/Details (Delayed)");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
JComponent panel = new MasterDetailsDelayedReadExample().build();
frame.getContentPane().add(panel);
frame.pack();
TutorialUtils.locateOnScreenCenter(frame);
frame.setVisible(true);
}
// Instance Creation ******************************************************
/**
* Constructs a delayed list editor using an example Album list
* and the default delay.
*/
public MasterDetailsDelayedReadExample() {
this(Album.ALBUMS);
}
/**
* Constructs a delayed list editor for editing the given list of Albums
* using the default delay.
*
* @param albums the list of Albums to edit
*/
public MasterDetailsDelayedReadExample(List albums) {
this(albums, DEFAULT_DELAY);
}
/**
* Constructs a list editor for editing the given list of Albums
* using the specified delay.
*
* @param albums the list of Albums to edit
* @param delay the milliseconds to wait before the album selection
* is forwarded to the SelectionInList
*/
public MasterDetailsDelayedReadExample(List albums, int delay) {
this.albumSelection = new SelectionInList(albums);
// Uses the delayed SelectionInList as PresentationModel's bean channel.
// The SelectionInList is wrapped so that selection updates will be
// deferred for the specified delay. In other words, the list's
// selection becomes the Presentation Model's new bean - after a delay.
detailsModel = new PresentationModel(
new DelayedReadValueModel(albumSelection, delay));
}
// Component Creation and Initialization **********************************
/**
* Creates and intializes the UI components. The JList used to present
* the Album list is bound directly to the SelectionInList which
* implements the required ListModel interface. Even the JList's
* selection model is bound directly bound the the SelectionInList's
* selection index holder. It's just that the presentation model's
* bean channel is not the selection, but a delayed selection.<p>
*
* If the user selects an element in the Album JList, the selection model
* changes immediately. It's just that the bean of the detailsModel will
* be set a bit later, which in turn holds back details change a bit.
* See the constructor to study how the master SelectionInList is wrapped
* by a DelayedReadValueModel to hold back selection changes for a limited
* amount of time.
*/
private void initComponents() {
albumsList = BasicComponentFactory.createList(
albumSelection,
TutorialUtils.createAlbumListCellRenderer());
titleField = BasicComponentFactory.createTextField(
detailsModel.getModel(Album.PROPERTYNAME_TITLE));
titleField.setEditable(false);
artistField = BasicComponentFactory.createTextField(
detailsModel.getModel(Album.PROPERTYNAME_ARTIST));
artistField.setEditable(false);
classicalField = BasicComponentFactory.createTextField(
ConverterFactory.createBooleanToStringConverter(
detailsModel.getModel(Album.PROPERTYNAME_CLASSICAL),
"Yes",
"No"));
classicalField.setEditable(false);
composerField = BasicComponentFactory.createTextField(
detailsModel.getModel(Album.PROPERTYNAME_COMPOSER));
composerField.setEditable(false);
closeButton = new JButton(TutorialUtils.getCloseAction());
}
// Building ***************************************************************
/**
* Builds and returns a panel that consists of
* a master list and a details form.
*
* @return the built panel
*/
public JComponent build() {
initComponents();
FormLayout layout = new FormLayout(
"right:pref, 3dlu, 150dlu:grow",
"p, 1dlu, p, 9dlu, p, 1dlu, p, 3dlu, p, 3dlu, p, 3dlu, p, 9dlu, p");
PanelBuilder builder = new PanelBuilder(layout);
builder.setDefaultDialogBorder();
CellConstraints cc = new CellConstraints();
builder.addSeparator("Albums", cc.xyw(1, 1, 3));
builder.add(new JScrollPane(
albumsList), cc.xy (3, 3));
builder.addSeparator("Delayed Details",
cc.xyw(1, 5, 3));
builder.addLabel("Title", cc.xy (1, 7));
builder.add(titleField, cc.xy (3, 7));
builder.addLabel("Artist", cc.xy (1, 9));
builder.add(artistField, cc.xy (3, 9));
builder.addLabel("Classical", cc.xy (1, 11));
builder.add(classicalField, cc.xy (3, 11));
builder.addLabel("Composer", cc.xy (1, 13));
builder.add(composerField, cc.xy (3, 13));
builder.add(buildButtonBar(), cc.xyw(1, 15, 3));
return builder.getPanel();
}
private JComponent buildButtonBar() {
return ButtonBarFactory.buildRightAlignedBar(closeButton);
}
}
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