Swing Hacks

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Chapter 5, Windows, Dialogs, and Frames

#40 Minimize to a Mini-Frame

HACK

I Shall Call Him...Mini-Me

Switching a frame between two sizes is quite easy: just call setSize( ) and

you’re done. Doing it well is a bit more difficult, however. When you mini-

mize the window, you also need to remove the window decorations, hide

the menu bar, and remove the components that shouldn’t be visible in the

mini-view. This is a bit trickier, not the least of which because you can’t turn

off the window decorations of a frame once it has been created. But I’m get-

ting ahead of myself. First, you need a sample application.

Let’s take a simple clock program. The normal window looks like

Figure 5-11. The goal is to provide a mini version that looks like Figure 5-12.

This program has a clock, a panel with more configuration options (repre-

sented here with just the label More configuration), a menu bar, and a pop-

up menu for later use. Example 5-9 creates the interface and puts the com-

ponents in the right places, but it doesn’t do anything with them yet.

Figure 5-11. A normal application window

Figure 5-12. A mini application window

Example 5-9. The beginning of a clock with a mini version

public class MiniMizeHack implements MouseListener, ActionListener {

public JFrame frame;

public JPanel panel;

public JPopupMenu popup;

Minimize to a Mini-Frame #40

Chapter 5, Windows, Dialogs, and Frames

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209

HACK

public JMenuBar menubar;

public JLabel top;

public JLabel bottom;

public MiniMizeHack( ) {

top = new JLabel(new ImageIcon("image.png"));

bottom = new JLabel("More configuration here");

frame = new JFrame("Mini Mize Hack");

panel = new JPanel( );

panel.setLayout(new BorderLayout( ));

panel.add("Center",bottom);

panel.add("North",top);

frame.getContentPane( ).add(panel);

menubar = new JMenuBar( );

JMenu menu = new JMenu("File");

menu.add(new JMenuItem("Open"));

menu.add(new JMenuItem("Quit"));

menubar.add(menu);

JMenu window = new JMenu("Window");

JMenuItem mini = new JMenuItem("Minimize");

mini.addActionListener(this);

window.add(mini);

menubar.add(window);

frame.setJMenuBar(menubar);

popup = new JPopupMenu( );

JMenuItem restore = new JMenuItem("Restore");

restore.addActionListener(this);

popup.add(restore);

}

public void mousePressed(MouseEvent e) {

maybeShowPopup(e);

}

public void mouseReleased(MouseEvent e) {

maybeShowPopup(e);

}

public void mouseExited(MouseEvent e) { }

public void mouseEntered(MouseEvent e) { }

public void mouseClicked(MouseEvent e) { }

private void maybeShowPopup(MouseEvent e) {

if (e.isPopupTrigger( )) {

popup.show(e.getComponent( ),

e.getX(), e.getY( ));

}

}

Example 5-9. The beginning of a clock with a mini version (continued)