J/Link Programming:
JavaSwing Example

Junzo SATO

J/Link enables us to handle Java objects within MATHEMATICA. The MATHEMATICA package "JavaSwing.m" was designed as collection of wrapper functions for the Java Swing classes. All basic aspects of these functions are shown in this Notebook.

Copyright © 2000-2002, Junzo SATO. All rights reserved.

Loading the JavaSwing MATHEMATICA package

>>> com.wolfram.jlink.MathJFrame <<<

Create

A MathJFrame is created.

A frame has four panes in its JRootPane. The content pane is one of the most important object among these. Glass pane, layered pane, and menu bar are the rest of these. The menu bar is null by default.

The frame is located to the center of the main screen and is shown.

<<< SimpleMathJFrame >>>

>>> javax.swing.JLayeredPane, JInternalFrame <<<

Create

Some constants for layers are listed.

We also list names of layers.

An ImageIcon which will be shown on a title bar of the internal frame is loaded.

JInternalFrame objects are added to the layer which is actually the layered pane of the frame.
A close box of an internal frame is not handled at now.

Dispose

JInternalFrame objects which is kept in the internalFrames are removed.

>>> javax.swing.JDesktopPane, JInternalFrame <<<

Create

A desktop is created. Internal frames are added to this desktop. The close box of the internal frame is handled correctly.

Dispose

>>> javax.swing.JSplitPane <<<

Create

Dispose

>>> javax.swing.JTabbedPane <<<

Create

Dispose

<<< SimpleJTabbedPane >>>

To respond to the change of the tab, you should install ChangeListener to JTabbedPane.
MathSwingChangeListener for J/Link is defined in JavaSwing.jar. The following is the source code.

MathSwingChangeListener.java

package JLinkProgramming.JavaSwing;
import com.wolfram.jlink.*;
import javax.swing.event.*;

public class MathSwingChangeListener extends MathListener implements ChangeListener {
    public MathSwingChangeListener() {
        super();
    }

    public MathSwingChangeListener(KernelLink ml) {
        super(ml);
    }

    public MathSwingChangeListener(String func) {
        this();
        setHandler("stateChanged", func);
    }

    public void stateChanged(ChangeEvent e) {
        Expr result = callMathHandler("stateChanged", new Object[]{e});
        if (result != null)
            result.dispose();
    }
}

>>> java.awt.FlowLayout <<<

Create

Dispose

>>> java.awt.GridLayout <<<

Create

Dispose

>>> java.awt.BorderLayout <<<

Create

Because we pass the string object to the add( ) method of the container pane, the java.lang.String object is created temporally.

Change widths of west and east buttons.

Change heights of north and south buttons.

Dispose

>>> java.awt.CardLayout <<<

See <<< SimpleCardLayout >>>

<<< SimpleCardLayout >>>

SimpleCardLayout

>>> java.awt.GridBagLayout <<<

Create

Dispose

>>> java.awt.BoxLayout <<<

Create

the panel shrinks

the panel is spread horizontally by the glue

the panel shrinks

the panel spreads itself

Dispose

>>> javax.swing.UIManager <<<

Create

com.sun.java.swing.plaf.windows.WindowsLookAndFeel

com.apple.mrj.swing.MacLookAndFeel

CDE/Motif

Dispose

>>> javax.swing.ImageIcon <<<

Create

Animation GIF is available too.

Dispose

>>> javax.swing.SwingConstants <<<

>>> javax.swing.JLabel <<<

Create

Simple label.

A label with icon.

Opacity of the label is set by setOpaque method.

Dispose

>>> javax.swing.border <<<

Create

Dispose

>>> javax.swing.JButton <<<

Create

Dispose

<<< SimpleBeep >>>

>>> javax.swing.plaf.basic.BasicArrowButton <<<

Create

Dispose

>>> javax.swing.JToggleButton <<<

Create

Dispose

>>> javax.swing.JCheckBox <<<

Create

Using icons is possible for the substitution of the default check mark.
To replace icons by the user's click, setIcon( ) method is available. An event handler also should be introduced.

Dispose

<<< SimpleJCheckBox >>>

>>> javax.swing.JRadioButton <<<

Create

Dispose

<<< SimpleJRadioButton >>>

>>> javax.swing.ButtonGroup <<<

Create

a panel is created on the frame

buttons are created on the panel

Dispose

>>> javax.swing.JList <<<

Create

Dispose

<<< SimpleJList (ListSelection) >>>

<<< SimpleJList (ListSelection And DoubleClick) >>>

>>> javax.swing.JComboBox <<<

Create

Dispose

<<< SimpleJComboBox >>>

>>> javax.swing.JTable <<<

Create

Dispose

Although components added to create JTable were removed explicitly in the above expressions, JTableHeader still remains on the pane. So we tries to remove all components on the pane.

<<< SimpleJTable >>>

To respond to the list selection, ListSelectionListener should be implemented. For J/Link, MathSwingListSelectionListener was defined by extending MathListener.

package JLinkProgramming.JavaSwing;

import com.wolfram.jlink.*;
import javax.swing.event.*;

public class MathSwingListSelectionListener extends MathListener implements ListSelectionListener {

    public MathSwingListSelectionListener() {
        super();
    }

    public MathSwingListSelectionListener(KernelLink ml) {
        super(ml);
    }

    public MathSwingListSelectionListener(String func) {
        this();
        setHandler("valueChanged", func);
    }

    public void valueChanged(ListSelectionEvent e) {
        Expr result = callMathHandler("valueChanged", new Object[]{e});
        if (result != null)
            result.dispose();
    }
    
}

>>> javax.swing.JTextField <<<

Create

Dispose

>>> javax.swing.JPasswordField <<<

Create

Dispose

>>> javax.swing.JTextArea <<<

Create

Cut, Copy, and Paste operations are available by calling JTextArea's methods.
By default, ctrl+x, ctrl+c, and ctrl+v are shortcuts for these commands.

Dispose

>>> javax.swing.JEditorPane <<<

Create 1

Dispose 1

Create 2

Dispose 2

>>> javax.swing.JTextPane <<<

Create

Dispose

>>> javax.swing.JScrollBar <<<

Create

Dispose

<<< SimpleJScrollBar >>>

>>> javax.swing.JScrollPane <<<

Create

Dispose

>>> javax.swing.JSlider <<<

Create

Dispose

<<< SimpleJSlider >>>

MathSwingChangeListener was defined. See SimpleJTable section.

>>> javax.swing.JMenuBar,
JMenu,
JMenuItem,
JCheckBoxMenuItem,
JRadioButtonMenuItem <<<

Create

menubar is created and set to the Frame

menu which will be added to the menubar is created

menu is removable

by default, menu is added to the last location in the menubar

adding the same menu object twice to the menubar can change the location of the menu in the menubar

more settings for the menu

menuitem

imageicon

menu@addSeparator[]

menu@add[JavaNew["javax.swing.JSeparator"]]

submenu can be treated just like a menuitem for the menu.

Dispose

Although the menubar is released, the frame still contains and draws empty menubar.
We have to erase the menubar by setting Null.

<<< SimpleJMenu >>>

>>> javax.swing.JPopupMenu <<<

Try right button click (Win) or ctrl+click (Mac) on the frame.

>>> javax.swing.JToolBar <<<

Create

Dispose

>>> javax.swing.JOptionPane <<<

Message

Yes No

Yes No Cancel

Selections

Text Input

>>> javax.swing.JFileChooser <<< from J/Link Examples Part1

>>> javax.swing.JColorChooser <<<

Color Chooser

Color Chooser With Default Color

Create

JColorChooser is a handy tool to select a color. This component is easily added to the pane on the frame.

Dispose

Create

Defaut color is assigned at the initialization of the chooser.

Dispose

To get a resulting color chosen by the user, getColor[] etc are prepared.

ShowColorChooser

>>> javax.swing.JTree <<<

Create

Selected Path

If there exists a selected node, names of its parents and path is constructed as follows.

Dispose

<<< SimpleJTree >>>

To respond to the tree selection, MathSwingTreeSelectionListener was defined.

package JLinkProgramming.JavaSwing;

import com.wolfram.jlink.*;
import javax.swing.event.*;

public class MathSwingTreeSelectionListener extends MathListener implements TreeSelectionListener {

    public MathSwingTreeSelectionListener() {
        super();
    }

    public MathSwingTreeSelectionListener(KernelLink ml) {
        super(ml);
    }

    public MathSwingTreeSelectionListener(String func) {
        this();
        setHandler("valueChanged", func);
    }

    public void valueChanged(TreeSelectionEvent e) {
        Expr result = callMathHandler("valueChanged", new Object[]{e});
        if (result != null)
            result.dispose();
    }
}

>>> javax.swing.JProgressBar <<< from J/Link Examples

>>> javax.swing.ProgressMonitor <<<

>>> javax.swing.ProgressMonitorInputStream <<<

>>> com.wolfram.jlink.MathJFrame <<<

Dispose

>>> Quit <<<

Reference:

[1] Satyaraj Pantham, "Pure JFC Swing", Sams Publishing, 1999