Subversion Repositories group.NITPanels

using System;

using System.ComponentModel;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Windows.Forms;

using System.Diagnostics;

namespace NITNavComm {

	/// <summary>

	/// The LEDBulb is a .Net control for Windows Forms that emulates an

	/// LED light with two states On and Off.  The purpose of the control is to 

	/// provide a sleek looking representation of an LED light that is sizable, 

	/// has a transparent background and can be set to different colors.  

	/// </summary>

	public partial class LedLight : UserControl {

		#region Public and Private Members

		private Color _color;

		private bool _on = true;

		private Color _reflectionColor = Color.FromArgb(180, 255, 255, 255);

		private Color[] _surroundColor = new Color[] { Color.FromArgb(0, 255, 255, 255) };

		private Timer _timer = new Timer();

        private Timer _flash = new Timer();

		/// <summary>

		/// Gets or Sets the color of the LED light

		/// </summary>

		[DefaultValue(typeof(Color), "153, 255, 54")]

		public Color Color { 

			get { return _color; } 

			set { 

				_color = value;

				this.DarkColor = ControlPaint.Dark(_color);

				this.DarkDarkColor = ControlPaint.DarkDark(_color);

				this.Invalidate();	// Redraw the control

			} 

		}

		/// <summary>

		/// Dark shade of the LED color used for gradient

		/// </summary>

		public Color DarkColor { get; protected set; }

		/// <summary>

		/// Very dark shade of the LED color used for gradient

		/// </summary>

		public Color DarkDarkColor { get; protected set; }

        public bool Flash {

            get { return _flash.Enabled; }

            set { _flash.Enabled = value; this.On = value; }

        }

		/// <summary>

		/// Gets or Sets whether the light is turned on

		/// </summary>

		public bool On { 

			get { return _on; } 

			set { _on = value; this.Invalidate(); } 

		}

		#endregion

		#region Constructor

		public LedLight() {

			SetStyle(ControlStyles.DoubleBuffer

			| ControlStyles.AllPaintingInWmPaint

			| ControlStyles.ResizeRedraw

			| ControlStyles.UserPaint

			| ControlStyles.SupportsTransparentBackColor, true);

			this.Color = Color.FromArgb(255, 153, 255, 54);

			_timer.Tick += new EventHandler(

				(object sender, EventArgs e) => { this.On = !this.On; }

			);

            _flash.Interval = 500;

            _flash.Tick += new EventHandler(

                (object sender, EventArgs e) => { this._flash.Enabled = false; this.On = false; }

            );

		}

		#endregion

		#region Methods

		/// <summary>

		/// Handles the Paint event for this UserControl

		/// </summary>

		protected override void OnPaint(PaintEventArgs e){

			// Create an offscreen graphics object for double buffering

			Bitmap offScreenBmp = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height);

			using (System.Drawing.Graphics g = Graphics.FromImage(offScreenBmp)) {

				g.SmoothingMode = SmoothingMode.HighQuality;

				// Draw the control

				drawControl(g, this.On);

				// Draw the image to the screen

				e.Graphics.DrawImageUnscaled(offScreenBmp, 0, 0);

			}

		}

		/// <summary>

		/// Renders the control to an image

		/// </summary>

		private void drawControl(Graphics g, bool on) {

			// Is the bulb on or off

			Color lightColor = (on)? this.Color : Color.FromArgb(150, this.DarkColor);

			Color darkColor = (on) ? this.DarkColor : this.DarkDarkColor;

			// Calculate the dimensions of the bulb

			int width = this.Width - (this.Padding.Left + this.Padding.Right);

			int height = this.Height - (this.Padding.Top + this.Padding.Bottom);

			// Diameter is the lesser of width and height

			int diameter = Math.Min(width, height);

			// Subtract 1 pixel so ellipse doesn't get cut off

			diameter = Math.Max(diameter - 1, 1);

			// Draw the background ellipse

			var rectangle = new Rectangle(this.Padding.Left, this.Padding.Top, diameter, diameter);

			g.FillEllipse(new SolidBrush(darkColor), rectangle);

			// Draw the glow gradient

			var path = new GraphicsPath();

			path.AddEllipse(rectangle);

			var pathBrush = new PathGradientBrush(path);

			pathBrush.CenterColor = lightColor;

			pathBrush.SurroundColors = new Color[] { Color.FromArgb(0, lightColor) };

			g.FillEllipse(pathBrush, rectangle);

			// Draw the white reflection gradient

			var offset = Convert.ToInt32(diameter * .15F);

			var diameter1 = Convert.ToInt32(rectangle.Width * .8F);

			var whiteRect = new Rectangle(rectangle.X - offset, rectangle.Y - offset, diameter1, diameter1);

			var path1 = new GraphicsPath();

			path1.AddEllipse(whiteRect);

			var pathBrush1 = new PathGradientBrush(path);

			pathBrush1.CenterColor = _reflectionColor;

			pathBrush1.SurroundColors = _surroundColor;

			g.FillEllipse(pathBrush1, whiteRect);

			// Draw the border

			g.SetClip(this.ClientRectangle);

			if (this.On) g.DrawEllipse(new Pen(Color.FromArgb(85, Color.Black),1F), rectangle);

		}

		/// <summary>

		/// Causes the Led to start blinking

		/// </summary>

		/// <param name="milliseconds">Number of milliseconds to blink for. 0 stops blinking</param>

		public void Blink(int milliseconds) {

			if (milliseconds > 0) {

				this.On = true;

				_timer.Interval = milliseconds;

				_timer.Enabled = true;

			}

			else {

				_timer.Enabled = false;

				this.On = false;

			}

		}

		#endregion

	}

}