/*
 * StopwatchGui.java
 *
 * Version:
 *     $Id$
 *
 * Revisions:
 *     $Log$
 */

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

/**
 * A simple GUI based stop watch application
 *
 * @author        Paul Tymann (ptt@cs.rit.edu)
 */

public class StopwatchGui implements ActionListener {
    private JFrame win;          // The main window for the app
    private TimerLabel theTime;  // Place to dosplay the time

    JButton lapReset;            // Lap/Reset button
    JButton startStop;           // Start/Stop button

    boolean stopped = true;      // True if the stopwatch is running
    boolean lap = false;         // True if the stopwatch is in lap mode

    /**
     * Create a new stop watch and display the resulting GUI.
     *
     * @param title title displayed in the title bar
     */
    
    public StopwatchGui( String title ) {
	win = new JFrame( title );

	// Frames do not handle close by default ...

	win.addWindowListener(
	    new WindowAdapter() {
		public void windowClosing( WindowEvent e ) {
		    System.exit( 0 );
                }
            }
        );

	// Create the label to display the time

	theTime = new TimerLabel();
	theTime.setFont( new Font( "Courier", Font.BOLD, 25 ) );

	// Create the buttons and put them in a panel

	JPanel buttonPanel = new JPanel();

	lapReset = new JButton( "Reset" );
	lapReset.setActionCommand( "lapReset" );
	lapReset.addActionListener( this );

	startStop = new JButton( "Start" );
	startStop.setActionCommand( "startStop" );
	startStop.addActionListener( this );

	buttonPanel.add( lapReset );
	buttonPanel.add( startStop );

	// Assemble the frame

	Container content = win.getContentPane();

	content.setLayout( new BorderLayout() );

	content.add( "North", theTime );
	content.add( "South", buttonPanel );

	// Display it
 
	win.pack();
	win.show();
    }

    /**
     * Handle the buttons on the GUI.
     *
     * When the watch is not running the reset and start buttons
     * are active.  Pressing the start button will start the watch
     * from the current time.  Pressing reset does not start the watch,
     * it simply resets the time back to 0.
     *
     * If the watch is running the lap and stop buttons will be displayed.
     * When the lap button is pressed, the display will freeze at the current
     * time but the watch will continue to run.  Pressing lap a second time
     * will cause the current time to be displayed.  Pressing stop will
     * stop the watch.
     *
     * @param e the event that caused the listener to become active
     */
    
    public void actionPerformed( ActionEvent e ) {
	// Get the string that identifies the button that was pressed

	String cmd = e.getActionCommand();

	if ( stopped ) {
	    if ( cmd.equals( "startStop" ) )
		startTheTimer();
	    else
		resetTheTimer();
	}
	else {
	    if ( cmd.equals( "startStop" ) )
		stopTheTimer();
	    else {
		if ( lap )
		    startTheTimer();
		else
		    pauseTheTimer();
	    }
	}
    }

    /**
     * Start the watch running.  Set the labels on the buttons to
     * stop and lap.
     */
    
    private void startTheTimer() {
	startStop.setText( "Stop" );
	lapReset.setText( "Lap" );
	
	stopped=false;
	lap=false;
	
	theTime.timerStart();
    }

    /**
     * Reset the timer.  Set the labels on the buttons to start
     * and reset.
     */
    
    private void resetTheTimer() {
	startStop.setText( "Start" );
	lapReset.setText( "Reset" );
	
	stopped=true;
	lap=false;
	
	theTime.timerReset();
    }

    /**
     * Stop the timer.  Set the labels on the buttons to start
     * and reset.
     */
    
    private void stopTheTimer() {
	theTime.timerStop();
	theTime.updateText();
	
	startStop.setText( "Start" );
	lapReset.setText( "Reset" );
	stopped=true;
    }
    
    /**
     * Freeze the display but let the watch continue to run.
     */
    
    private void pauseTheTimer() {
	theTime.timerNoUpdate();
	lap=true;
    }

    /**
     * Create a stopwatch and let it run!!
     *
     * @param args[] command line arguments (ignored).
     */
    
    public static void main( String args[] ) {
	StopwatchGui gui = new StopwatchGui( "Demo" );
    }

} // StopWatchGui