cool java swing application

[paul wang]

Who know how to generate such toolbar at the left side of this java swing application?and what's more, how to set the backend image of jdesktopPane?
With best regards

[Nathan Pruett]

The toolbar is a custom component... probably built using buttons connected to Panels that are setVisible( true/false ) when the button is pressed...

As for setting the Icon of a JDesktop, here is some code that I have that does the same thing...

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import javax.swing.Icon;
import javax.swing.JLabel;
 
public class DesktopBackground extends JLabel {
 
    protected Icon icon;
 
    public DesktopBackground() {
        this( null );
    }
 
    public DesktopBackground( Icon icon ) {
        super( icon );
        this.icon = icon;
    }
 
    public void setIcon( Icon icon ) {
        this.icon = icon;
        revalidate();
    }
 
    public Icon getIcon() {
        return icon;
    }
 
    public void paintComponent( Graphics g ) {
        if( icon != null ) {
            Insets insets = getInsets();
            icon.paintIcon( this, g, insets.right, insets.top );
        }
    }
 
    public Dimension getPreferredSize() {
        Dimension newDim = super.getPreferredSize();
        Insets insets = getInsets();
        if( icon != null ) {
            newDim = new Dimension( insets.right + icon.getIconWidth() +
                    insets.left, insets.bottom + icon.getIconHeight() +
                    insets.top );
        }
        return newDim;
    }
}

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JDesktopPane;
import javax.swing.JFileChooser;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
 
public class EditorDesktop extends JDesktopPane {
 
    protected DesktopBackground backgroundIcon;
 
    public EditorDesktop() {
        backgroundIcon = new DesktopBackground();
        setLayer( backgroundIcon, FRAME_CONTENT_LAYER.intValue() );
        add( backgroundIcon );
        addComponentListener( new IconListener() );
        addMouseListener( new PopupLaunchListener() );
    }
 
    public void setBackground( Icon icon ) {
        backgroundIcon.setIcon( icon );
        revalidate();
    }
 
    protected void resetBackgroundIcon() {
        int x = ( getWidth() - backgroundIcon.getPreferredSize().width )
                / 2;
        int y = ( getHeight() - backgroundIcon.getPreferredSize().height )
                / 2;
        int w = backgroundIcon.getPreferredSize().width;
        int h = backgroundIcon.getPreferredSize().height;
        backgroundIcon.setBounds( x, y, w, h );
        backgroundIcon.setVisible( true );
        revalidate();
    }
 
    private class IconListener extends ComponentAdapter {
 
        public void componentShown( ComponentEvent event ) {
            resetBackgroundIcon();
        }
 
        public void componentResized( ComponentEvent event ) {
            resetBackgroundIcon();
        }
    }
 
    private class PopupLaunchListener extends MouseAdapter {
        public void mousePressed( MouseEvent e ) {
            if( e.isMetaDown() ) {
                JPopupMenu popup = new JPopupMenu( "Desktop Controls" );
                JMenuItem changeBackground = new JMenuItem( "Change Background..." );
                popup.add( changeBackground );
                changeBackground.addActionListener( new ChangeIconActionListener() );
                popup.show( EditorDesktop.this, e.getX(), e.getY() );
            }
        }
    }
 
    private class ChangeIconActionListener implements ActionListener {
        public void actionPerformed( ActionEvent e ) {
            JFileChooser chooser = new JFileChooser();
            chooser.setCurrentDirectory( new File( "." ) );
            chooser.setFileFilter( new ImageFileFilter() );
            int returnVal = chooser.showOpenDialog( EditorDesktop.this );
            if( returnVal == JFileChooser.APPROVE_OPTION &&
                chooser.getSelectedFile() != null ) {
                backgroundIcon.setIcon( new ImageIcon( chooser.getSelectedFile().toString() ) );
                resetBackgroundIcon();
                revalidate();
            }
        }
    }
 
    public static void main( String[] arg ) {
        JFrame f = new JFrame( "Desktop Test" );
        f.setDefaultCloseOperation( f.EXIT_ON_CLOSE );
        EditorDesktop desktop = new EditorDesktop();
        desktop.setBackground( new ImageIcon( "image.gif" ) );
        desktop.setPreferredSize( new Dimension( 640, 480 ) );
        f.setContentPane( desktop );
        f.pack();
        f.show();
    }
}

-Nate

[paul wang]

thanks a lot, but can you give me one example code for that toolbar? your help is appreciated.

[Nathan Pruett]

Here's a quick example of how to do the toolbar... it still needs a little work, but it shows generally how to do this...

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class ButtonMenuPanel extends JPanel {
    protected HashMap buttonHash;
    protected JPanel bottom, top, center;
    protected JButton selected;
    private ActionListener buttonHandler;
    
    public ButtonMenuPanel() {
        buttonHash = new HashMap();
        buttonHandler = new ButtonHandler();
        setLayout( new BoxLayout( this, BoxLayout.Y_AXIS ) );
    }
    
    public void addButtonMenu( String name, JComponent[] contents ) {
        JPanel p = new JPanel();
        JButton b = new JButton( name );
        p.setLayout( new BoxLayout( p, BoxLayout.Y_AXIS ) );
        if ( contents != null ) {
            for ( int i = 0; i < contents.length; i++ ) {
                p.add( contents[ i ] );
            }
        }
        p.setVisible( false );
        b.addActionListener( buttonHandler );
        buttonHash.put( b, p );
        add( b );
        add( p );
        if ( selected == null ) {
            selected = b;
            p.setVisible( true );
        }
        revalidate();
    }
    
    public static void main( String arg[] ) {
        JLabel[] sysContents = { new JLabel( "Scheduler" ), 
                new JLabel( "Tracing" ), new JLabel( "BO Admin" ) };
        JLabel[] userContents = { new JLabel( "Users" ),
                new JLabel( "Rights" ) };
        JLabel[] connectContent = { new JLabel( "Connect" ),
                new JLabel( "Disconnect" ) };
        JLabel[] utilityContent = { new JLabel( "Water" ),
                new JLabel( "Electricity" ), new JLabel( "Phone" )};
        JLabel[] wizContent = { new JLabel( "Gandalf" ),
                new JLabel( "Elminster" ), new JLabel( "Oz" ) };
        JFrame f = new JFrame( "Lookie!  A ButtonMenuPanel!" );
        f.setSize( 400, 400 );
        f.getContentPane().setLayout( new BorderLayout() );
        f.setDefaultCloseOperation( f.EXIT_ON_CLOSE );
        ButtonMenuPanel bmPanel = new ButtonMenuPanel();
        bmPanel.addButtonMenu( "System", sysContents );
        bmPanel.addButtonMenu( "Users/Rights", userContents );
        bmPanel.addButtonMenu( "Connectivity", connectContent );
        bmPanel.addButtonMenu(  "Utilities", utilityContent );
        bmPanel.addButtonMenu( "Wizards", wizContent );
        JPanel p = new JPanel();
        f.getContentPane().add( bmPanel, BorderLayout.WEST );
        f.getContentPane().add( p, BorderLayout.CENTER );
        f.setVisible( true );
    }
    
    private class ButtonHandler implements ActionListener {
        public void actionPerformed( ActionEvent e ) {
            JButton b = (JButton)e.getSource();
            if ( !b.equals( selected ) ) {
                Iterator it = buttonHash.keySet().iterator();
                while ( it.hasNext() ) {
                    JButton temp = (JButton)it.next();
                    if ( temp.equals( selected ) ) {
                        JPanel p = (JPanel)buttonHash.get( temp );
                        p.setVisible( false );
                    }
                    else if ( temp.equals( b ) ) {
                        JPanel p = (JPanel)buttonHash.get( b );
                        p.setVisible( true );
                    }
                }
            }
            selected = b;
        }
    }
}

[paul wang]

perfect,you are really so nice and i can continue my work, thanks again for your help