public static Rectangle GetViewableRect(Control control)
{
//! Get a graphics from the control, we need the HDC
Graphics graphics = Graphics.FromHwnd(control.Handle);
//! Get the hDC ( remember to call ReleaseHdc() when finished )
IntPtr hDC = graphics.GetHdc();
//! Create a rect to receive the viewable area of the control
WIN32Rect r = new WIN32Rect();
//! Call the Win32 method which recieves the viewable area
GetClipBox(hDC, ref r);
//! Convert that to a .NET Rectangle
Rectangle rectangle = new Rectangle(r.left, r.top, r.right - r.left, r.bottom - r.top);
//! Release the HDC (if you don't, the CLR throws an
// exception when it tries to Finalize/Dispose it)
graphics.ReleaseHdc(hDC);
//! Dispose of the graphics, we don' need it any more
graphics.Dispose();
graphics = null;
return(rectangle);
}
internal static extern int GetClipBox(IntPtr hDC,
ref WIN32Rect r);
private static extern int GetClipBox(System.IntPtr hDC,
ref WIN32Rect r);
internal static extern int GetClipBox(IntPtr hDC,
ref WIN32Rect r);
