Source/BubbleBarOverlay.cs

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using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Text;
using System.Windows.Forms;
using System.ComponentModel;

namespace DevComponents.DotNetBar
{
	/// <summary>
	/// Represents overlay class to support bubble effects on BubbleBar control.
	/// </summary>
	[ToolboxItem(false)]
	internal class BubbleBarOverlay:Control
	{
		#region Private Variables
		private BubbleBar m_BubbleBar=null;
		private Timer m_VisibilityTimer=null;
		#endregion

		#region Internal Implementation
		public BubbleBarOverlay(BubbleBar parent)
		{
			if(parent==null)
				throw new InvalidOperationException("Parent BubbleBar object for BubbleBarOverlay cannot be null.");

			m_BubbleBar=parent;
			this.SetStyle(ControlStyles.UserPaint,true);
			this.SetStyle(ControlStyles.AllPaintingInWmPaint,true);
			this.SetStyle(ControlStyles.Opaque,true);
			this.SetStyle(ControlStyles.ResizeRedraw,true);
			//this.SetStyle(DisplayHelp.DoubleBufferFlag,true);
			this.SetStyle(ControlStyles.SupportsTransparentBackColor,true);
			this.SetStyle(ControlStyles.ContainerControl,false);
			this.SetStyle(ControlStyles.Selectable,false);
			this.BackColor=Color.Transparent;
		}

		protected override void OnPaint(PaintEventArgs e){}

		internal void UpdateWindow()
		{
			// Create bitmap for drawing onto
			Bitmap memoryBitmap = new Bitmap(this.Width, this.Height, PixelFormat.Format32bppArgb);

			using(Graphics g = Graphics.FromImage(memoryBitmap))
			{
				// Draw the background area
				g.Clear(Color.Transparent);
				g.CompositingMode=System.Drawing.Drawing2D.CompositingMode.SourceCopy;

                g.TextRenderingHint = DisplayHelp.AntiAliasTextRenderingHint;
				g.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

				PaintEventArgs p=new PaintEventArgs(g,this.DisplayRectangle);
				m_BubbleBar.OnPaintOverlay(p);
				
				// Get hold of the screen DC
				IntPtr hDC = NativeFunctions.GetDC(IntPtr.Zero);