Swing Hacks

Block a Window Without a Modal Dialog #58

Chapter 8, Rendering

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HACK

Putting It All Together

With your window blocking and long-process classes ready, you can put

them together in a simple program. The

main( ) method in Example 8-5 cre-

ates a text area, a button, and a status label. Then it makes a

WindowBlocker

and installs it with frame.setGlassPane( ). The LongProcess is added as an

action listener to the Start button, so when the user presses Start Processing,

the process will launch and call

WindowBlocker.block( ). Once the process

ends, it will call

WindowBlocker.unBlock( ), releasing the window.

// sleep for 1 second

try {

Thread.currentThread( ).sleep(1000);

} catch (Exception ex) {

}

}

// set the final status string

setText("Process Complete");

blocker.unBlock( );

}

}

Example 8-5. Testing the blocking window

public static void main(String[] args) {

JFrame frame = new JFrame("Blocking Window");

JTextArea jta = new JTextArea(10,40);

JScrollPane scroll = new JScrollPane(jta);

JButton start = new JButton("Start Processing");

JLabel status = new JLabel("status");

WindowBlocker blocker = new WindowBlocker( );

frame.setGlassPane(blocker);

start.addActionListener(new LongProcess(status,blocker));

Container comp = frame.getContentPane( );

comp.add("North", start);

comp.add("Center", scroll);

comp.add("South", status);

frame.pack( );

frame.show( );

}

Example 8-4. Filling up clock cycles (continued) ...