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