using System;
using System.Drawing;
using System.Windows.Forms;
using Assembly = System.Reflection.Assembly;
using Path = System.IO.Path;
using ResourceManager = System.Resources.ResourceManager;

namespace ProcessInfo
{
	public class Throbber : UserControl
	{
		private Image stoppedImage;
		private Image throbImage;
		private PictureBox pictureBox;
		private bool throbbing = false;

		public Throbber() : base()
		{
			this.Name = "Throbber";
			this.Size = new Size( 16, 16 );

			ResourceManager resources = new ResourceManager( "ProcessInfo.Throbber", this.GetType().Assembly );
			throbImage = (Bitmap)resources.GetObject( "ThrobberOn" );
			stoppedImage = (Bitmap)resources.GetObject( "ThrobberOff" );

			pictureBox = new PictureBox();
			this.Controls.Add( pictureBox );
			SetImage();
		}

		protected override void Dispose( bool disposing )
		{
			if ( disposing )
			{
				pictureBox.Dispose();
				stoppedImage.Dispose();
				throbImage.Dispose();
			}

			base.Dispose( disposing );
		}

		public bool Throbbing
		{
			get { return throbbing; }

			set
			{
				throbbing = value;
				SetImage();
			}
		}

		public Image StoppedImage
		{
			get { return stoppedImage; }
			
			set
			{
				if ( value == null )
				{
					throw new ArgumentNullException( "value" );
				}

				stoppedImage.Dispose();
				stoppedImage = value;
				SetImage();
			}
		}

		public Image ThrobImage
		{
			get { return throbImage; }
			
			set
			{
				if ( value == null )
				{
					throw new ArgumentNullException( "value" );
				}

				throbImage.Dispose();
				throbImage = value;
				SetImage();
			}
		}

		private void SetImage()
		{
			Image image = ( throbbing ) ? this.throbImage : this.stoppedImage;

			// so that the throbber doesn't reset unless its state has changed
			if ( pictureBox.Image != image )
			{
				pictureBox.Image = image;
			}
		}
	}
}