using System;
using System.Drawing;
using System.Windows.Forms;
class EnterLeave: Form
{
bool bInside = false;
public static void Main()
{
Application.Run(new EnterLeave());
}
public EnterLeave()
{
}
protected override void OnMouseEnter(EventArgs ea)
{
bInside = true;
Invalidate();
}
protected override void OnMouseLeave(EventArgs ea)
{
bInside = false;
Invalidate();
}
protected override void OnMouseHover(EventArgs ea)
{
Graphics grfx = CreateGraphics();
grfx.Clear(Color.Red);
System.Threading.Thread.Sleep(500);
grfx.Clear(Color.Green);
grfx.Dispose();
}
protected override void OnPaint(PaintEventArgs pea)
{
Graphics grfx = pea.Graphics;
grfx.Clear(bInside ? Color.Green : BackColor);
}
}