/*

File: BlockedEventQueue.java

Abstract:  

    This is an example which INCORRECTLY handles actionEvents.

    It is designed as a simple example of a java tool which

    will lock up and show the spinning cursor, providing a case

    where developers can use practice with our debugging tools 

    to identify and isolate a problem.

    This example consists of two main parts: 

    1) a Panel which counts the number of times that it

     is asked to paint itself

    2) a Button which, when triggered, waits for the next

     paint event on the Panel, and then changes its name.

Version: <1.0>

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*/ 

import java.util.*;

import java.awt.*;

import java.awt.event.*;

public class BlockedEventQueue extends Frame {

    // An object used for inter-thread communication

    Object paintWatcher = new Object();

    //

    //  A Panel that just "counts" each paint request

    //

    class PaintCounter extends Panel {

        int paintcount = 0;

        public void paint( Graphics g) {

            super.paint(g);

            paintcount++;

            // Paint a "count" variable in the frame

            FontMetrics fm = g.getFontMetrics();

            int ascent = fm.getAscent();

            g.drawString("Paint Count: "+paintcount, 10, ascent+10);

            // handle inter-thread communication

            synchronized( paintWatcher ) {

                paintWatcher.notify();

            }

        }

        public Dimension getMinimumSize() {

            return new Dimension(100,200);

        }

    }

    //

    //  A Button that just waits for the next paint to fire

    //  The button does not actually trigger a repaint;

    //  to do so, just resize the window manually

    //

    class WaitButton extends Button implements ActionListener {

        public WaitButton() {

            super( "Wait for paint" );

            // setFont( new Font( "Lucida Grande", Font.PLAIN, 30 ));

            addActionListener(this);

        }

        public void actionPerformed(ActionEvent e) {

            synchronized (paintWatcher) {

                try {

                    paintWatcher.wait();

                }

                catch( InterruptedException ix ) {}

            } 

            setLabel("Painted!");

        }

//      public void actionPerformed(ActionEvent e) {

//          (new Thread() { 

//              public void run() {

//                  synchronized (paintWatcher) {

//                      try {

//                          paintWatcher.wait();

//                      }

//                      catch( InterruptedException ix ) {}

//                  } 

//                  setLabel("Painted!");

//              }

//          }).start();

//      }

/*      

  Above actionPerformed offloads the waiting to another thread, allowing

  the event queue (and the repaint we are waiting on) to proceed

  Use this fix to remedy the problem caused by the above actionPerformed method

*/

    }

    //

    //  A frame for the example, with one button and a panel;

    //

    public BlockedEventQueue() {

        super("Test Frame");

        setFont( new Font( "Lucida Grande", Font.PLAIN, 30 ));

        Panel counter = new PaintCounter();

        Button waiter = new WaitButton();

        Panel  panel = new Panel();

        panel.setLayout( new GridLayout( 3 ,1) );

        // Add the button

        panel.add(waiter);

        // Add a tiny "spacer" panel

        panel.add(new Panel());

        // Add the counter panel

        panel.add(counter);

        add(panel);

        setSize(300,300);

        setVisible(true);

    }

    public static void main(String args[]) {

        new BlockedEventQueue();

    }

}

//<<<<<<< BlockedEventQueue.java

//  New actionPerformed offloads the waiting to another thread, allowing

//  the event queue (and the repaint we are waiting on) to proceed

//  Use this fix to remedy the problem caused by the above actionPerformed method

/*      

        public void actionPerformed(ActionEvent e) {

            (new Thread() { 

                public void run() {

                    synchronized (paintWatcher) {

                        try {

                            paintWatcher.wait();

                        }

                        catch( InterruptedException ix ) {

                        }

                    } 

                    setLabel("Painted!");

                }

            }).start();

        }

=======

>>>>>>> 1.4*/