// TwoButtonStopWatch -- C# Version
// This program simulates a two button stopwatch.
//
// Written by: Stuart Hansen
// Last Modified: June 1, 2002
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace TwoButtonStopwatch
{
	public class Stopwatch : Form
	{
		private Container components;  // The container for the buttons, etc.
		private State state;           // The control state of the system
		private Button startStop;      // The startStop button
		private Button lap;            // The lap button
		private TextBox display;       // The textbox where the time is displayed
		private Timer timer1;          // The timer that sends ticks to the watch

		private long currentTime;      // The internal time
		private long displayTime;      // The time that is displayed

		// gets the currentTime
		private long getCurrentTime() { return currentTime; }

		// sets the current time
		private void setCurrentTime(long timeArg) { currentTime = timeArg; }

		// sets the display time
		private void setDisplayTime (long timeArg)
		{
			displayTime = timeArg;

			// Translate the minutes to a string
			String minutes = ((Int32)(displayTime/600)%60).ToString();
			if ((displayTime/600)%60 < 10) minutes = "0" + minutes;

			// Translate the seconds to a string
			String seconds = ((Int32)(displayTime/10)%60).ToString();
			if ((displayTime/10)%60 < 10) seconds = "0" + seconds;

			// Translate the tenths of seconds to a string
			String tenths = ((Int32)(displayTime%10)).ToString();
          
			// Display the time
			display.Text = minutes + ":" + seconds + "." + tenths;
		}

		// The state interface that all concrete states must implement
		interface State
		{
			void updateTime();       // execute when the timer goes off
			void startStopClicked(); // execute when the stopStop button is clicked
			void lapClicked();       // execute when the lap button is clicked
		}

		// The state for a stopped watch
		class Stopped : State 
		{
			private Stopwatch sw;  // a reference to the stopwatch

			// A simple constructor
			public Stopped (Stopwatch swarg)
			{
				sw = swarg;
			}

			// Do nothing when the timer goes off and the watch is stopped
			public void updateTime() {}

			// Move to the started state
			public void startStopClicked()
			{
				sw.state = new Started(sw);
			}

			// Reset the watch
			public void lapClicked()
			{
				sw.setCurrentTime(0);
				sw.setDisplayTime(0);
			}
		}

		// The state when the watch is started
		class Started : State 
		{
			private Stopwatch sw;   // a reference to the stopwatch

			// A simple constructor
			public Started (Stopwatch swarg)
			{
				sw = swarg;
			}

			// Update the current time and display time on each timer tick
			public void updateTime()
			{
				sw.setCurrentTime(sw.getCurrentTime()+1);
				sw.setDisplayTime(sw.getCurrentTime());
			}

			// Move to a stopped state
			public void startStopClicked()
			{
				sw.state = new Stopped(sw);
			}

			// Keep the watch running but freeze the display
			public void lapClicked()
			{
				sw.state = new LapAndStarted(sw);
			}
		}

		// The state when the watch is stopped and the display frozen
		class LapAndStopped : State 
		{
			private Stopwatch sw;    // a reference to the stopwatch

			// A simple constructor
			public LapAndStopped (Stopwatch swarg)
			{
				sw = swarg;
			}

			// Do nothing when the timer goes off
			public void updateTime() {}

			// Start the watch and keep the display frozen
			public void startStopClicked()
			{
				sw.state = new LapAndStarted(sw);
			}

			// Update the time and more to the stopped state
			public void lapClicked()
			{
				sw.setDisplayTime(sw.getCurrentTime());
				sw.state = new Stopped(sw);
			}
		}

		// The state when the watch is running and the display is frozen
		class LapAndStarted : State 
		{
			private Stopwatch sw;    // a reference to the stopwatch

			// A simple constructor
			public LapAndStarted (Stopwatch swarg)
			{
				sw = swarg;
			}

			// Update the internal time, but keep the display frozen
			public void updateTime()
			{
				sw.setCurrentTime(sw.getCurrentTime()+1);
			}

			// Stop the watch and keep the display frozen
			public void startStopClicked()
			{
				sw.state = new LapAndStopped(sw);
			}

			// Update the display and unfreeze it.
			public void lapClicked()
			{
				sw.setDisplayTime(sw.getCurrentTime());
				sw.state = new Started(sw);
			}
		}

		// The handler method for the lap button
		private void lap_Click(object sender, System.EventArgs e)
		{
			state.lapClicked();
		}

		// The handler method for the startStop button
		private void startStop_Click(object sender, System.EventArgs e)
		{
			state.startStopClicked();
		}

		// The handler method for the timer ticks
		private void timer1_Tick(object sender, System.EventArgs e)
		{
			state.updateTime();
		}

		// The stopwatch constructor
		public Stopwatch()
		{
			// Build the stopwatch
			InitializeComponent();

            // Set the initial state
			state = new Stopped (this);

			// Initialize the time attributes
			currentTime = 0;
			displayTime = 0;
		}

		// An automatically generated destructor
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}
		
		// An automatically generated GUI initializer
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.startStop = new System.Windows.Forms.Button();
			this.lap = new System.Windows.Forms.Button();
			this.display = new System.Windows.Forms.TextBox();
			this.timer1 = new System.Windows.Forms.Timer(this.components);
			this.SuspendLayout();
			// 
			// startStop
			// 
			this.startStop.Location = new System.Drawing.Point(40, 24);
			this.startStop.Name = "startStop";
			this.startStop.Size = new System.Drawing.Size(120, 24);
			this.startStop.TabIndex = 0;
			this.startStop.Text = "Start/Stop";
			this.startStop.Click += new System.EventHandler(this.startStop_Click);
			// 
			// lap
			// 
			this.lap.Location = new System.Drawing.Point(40, 72);
			this.lap.Name = "lap";
			this.lap.Size = new System.Drawing.Size(120, 24);
			this.lap.TabIndex = 1;
			this.lap.Text = "Lap";
			this.lap.Click += new System.EventHandler(this.lap_Click);
			// 
			// display
			// 
			this.display.Font = new System.Drawing.Font("Courier New", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.display.Location = new System.Drawing.Point(40, 120);
			this.display.Name = "display";
			this.display.Size = new System.Drawing.Size(120, 22);
			this.display.TabIndex = 2;
			this.display.Text = "00:00.0";
			this.display.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;
			// 
			// timer1
			// 
			this.timer1.Enabled = true;
			this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
			// 
			// Stopwatch
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(192, 165);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
								          this.display, this.lap, this.startStop});
			this.Name = "Stopwatch";
			this.ResumeLayout(false);
		}

		// A very simple main
		static void Main() 
		{
			Application.Run(new Stopwatch());
		}
	}
}