protected override void WndProc(ref Message message)
{
switch (message.Msg)
{
case 15:
{
var paintStruct = new PaintStruct();
var targetDc = NativeMethods.BeginPaint(message.HWnd, ref paintStruct);
var rectangle = new Rectangle(paintStruct.RcPaint_left, paintStruct.RcPaint_top,
paintStruct.RcPaint_right - paintStruct.RcPaint_left,
paintStruct.RcPaint_bottom - paintStruct.RcPaint_top);
if ((rectangle.Width > 0) && (rectangle.Height > 0))
{
using (
var graphics = BufferedGraphicsManager.Current.Allocate(targetDc,
ClientRectangle))
{
var hdc = graphics.Graphics.GetHdc();
var m = Message.Create(Handle, 0x318, hdc, IntPtr.Zero);
DefWndProc(ref m);
graphics.Graphics.ReleaseHdc(hdc);
graphics.Render();
}
}
NativeMethods.EndPaint(message.HWnd, ref paintStruct);
message.Result = IntPtr.Zero;
return;
}
case 20:
message.Result = (IntPtr) 1;
return;
}
base.WndProc(ref message);
}
public static extern bool EndPaint(IntPtr hWnd, ref PaintStruct paintStruct);
public static extern bool EndPaint(IntPtr hWnd, ref PaintStruct paintStruct);
public static extern IntPtr BeginPaint(IntPtr hWnd, ref PaintStruct paintStruct);
public static extern IntPtr BeginPaint(IntPtr hWnd, ref PaintStruct paintStruct);