digitalclockwithproperties.cs

《c#技术内幕代码》

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

namespace CH13_3
{
	/// <summary>
	/// Summary description for DigitalClockWithProperties.
	/// </summary>
	public class DigitalClockWithProperties : System.Windows.Forms.UserControl
	{
		private System.ComponentModel.IContainer components;
		private System.Windows.Forms.Timer timer1;
	
		public enum TimeFormat
		{
			ShortForm = 1,
			LongForm  = 2
		};
		private TimeFormat fFormat;

		public TimeFormat Format
		{
			get 
			{
				return fFormat;
			}
			set
			{
				fFormat = value;
			}
		}



		public DigitalClockWithProperties()
		{
			// This call is required by the Windows.Forms Form Designer.
			InitializeComponent();

			// TODO: Add any initialization after the InitForm call

		}

		/// <summary> 
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Component Designer generated code
		/// <summary> 
		/// Required method for Designer support - do not modify 
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.timer1 = new System.Windows.Forms.Timer(this.components);
			// 
			// timer1
			// 
			this.timer1.Enabled = true;
			this.timer1.Interval = 1000;
			this.timer1.Tick += new System.EventHandler(this.OnTick);
			// 
			// DigitalClockWithProperties
			// 
			this.Name = "DigitalClockWithProperties";
			this.Paint += new System.Windows.Forms.PaintEventHandler(this.OnPaint);

		}
		#endregion

		private void OnPaint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			// Get the time in system format.
			System.DateTime dt = System.DateTime.Now;

			// Get the text that represents that time
			String Text = "";
			switch ( fFormat )
			{
				case TimeFormat.LongForm:
					Text = dt.ToLongTimeString();
					break;
				case TimeFormat.ShortForm:
					Text = dt.ToShortTimeString();
					break;
			}

			e.Graphics.DrawString(Text, Font, new SolidBrush (ForeColor),
				ClientRectangle);

		}

		private void OnTick(object sender, System.EventArgs e)
		{
			Refresh();
		}
	}
}