Little test for invalidation. Nice for profiling.

svn path=/trunk/winforms/; revision=54257

invalidate/Makefile

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+all: mono
+
+mono: swf-invalidate.cs
+	mcs swf-invalidate.cs /r:System.Windows.Forms.dll /r:System.Drawing.dll
+
+dotnet: swf-invalidate.cs
+	csc swf-invalidate.cs /r:System.Windows.Forms.dll /r:System.Drawing.dll
+
+clean:
+	rm swf-invalidate.exe -r -f

invalidate/swf-invalidate.cs

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+
+using System;
+using System.Drawing;
+using System.Windows.Forms;
+
+
+
+public class InvalidateForm : Form {
+
+	private Timer timer;
+	private int width;
+	private bool region;
+
+	public InvalidateForm ()
+	{
+		timer = new Timer ();
+		timer.Interval = 500;
+		timer.Tick += new EventHandler (TimerTick);
+		timer.Enabled = true;
+
+		BackColor = Color.Blue;
+
+		Paint += new PaintEventHandler (PaintHandler);
+		Click += new EventHandler (ClickHandler);
+	}
+
+	private void TimerTick (object sender, EventArgs e)
+	{
+		width += 10;
+		if (width > Width + 11) {
+			width = 0;
+			Refresh ();
+			region = !region;
+			return;
+		}
+
+		if (!region) {
+			Invalidate (new Rectangle (0, 0, width, Height));
+		} else {
+			int half = width / 2;
+			int xmiddle = Width / 2;
+			int ymiddle = Height / 2;
+			Rectangle rect = new Rectangle (xmiddle - half, ymiddle - half, width, width);
+			Invalidate (new Region (rect));
+		}
+	}
+
+	private void ClickHandler (object sender, EventArgs e)
+	{
+		timer.Enabled = !timer.Enabled;
+	}
+
+	private void PaintHandler (object sender, PaintEventArgs pe)
+	{
+		if (pe.ClipRectangle.Width == Width && pe.ClipRectangle.Height == Height) {
+			Console.WriteLine ("Clearing Form");
+			pe.Graphics.FillRectangle (new SolidBrush (BackColor), pe.ClipRectangle);
+			return;
+		}
+			
+		Console.WriteLine ("Filling:  " + pe.ClipRectangle);
+		pe.Graphics.FillRectangle (new SolidBrush (Color.Red), pe.ClipRectangle);
+	}
+
+	public static void Main ()
+	{
+		Application.Run (new InvalidateForm ());
+	}
+}
+