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

namespace Volian.Controls.Library
{
	/// <summary>
	/// Summary description for TransPanel.
	/// </summary>
	public partial class TransparentPanel : Panel
	{
		private string _Caption = "Inactive";
		public string Caption
		{
			get { return _Caption; }
			set { _Caption = value; InvalidateEx(); }
		}
		private int _Alpha = 128;
		public int Alpha
		{
			get { return _Alpha; }
			set { _Alpha = value; InvalidateEx(); }
		}
		public TransparentPanel()
		{
			InitializeComponent();
		}
		protected override CreateParams CreateParams
		{
			get
			{
				CreateParams cp = base.CreateParams;
				cp.ExStyle |= 0x00000020; //WS_EX_TRANSPARENT
				return cp;
			}
		}
		protected void InvalidateEx()
		{
			if (Parent == null)
				return;
			Rectangle rc = new Rectangle(this.Location, this.Size);
			Parent.Invalidate(rc, true);
		}
		protected override void OnPaintBackground(PaintEventArgs pevent)
		{
			//do not allow the background to be painted 
		}
		protected override void OnPaint(PaintEventArgs e)
		{
			SizeF txtSize = e.Graphics.MeasureString(_Caption, this.Font);
			//Use a gray rectangle to show that the underlying control is inactive
			//using (Brush b2 = new SolidBrush(Color.FromArgb(_Alpha, this.BackColor)))
			//  e.Graphics.FillRectangle(b2, this.ClientRectangle);
			using (Brush b = new SolidBrush(Color.FromArgb(_Alpha, this.ForeColor)))
				e.Graphics.DrawString(_Caption, this.Font, b, this.Width - txtSize.Width, 2);
		}
	}
}