//// use WS_EX_COMPOSITED to avoid flickering e.g. at splitter drag
//private static void SetFormLevelDoubleBuffering( ScrollableControl control, bool enable )
//{
// // stop scrollbar animation to avoid glitch.
// if( enable && ( control.HorizontalScroll.Visible || control.VerticalScroll.Visible ) )
// {
// // https://stackoverflow.com/questions/562029/stopping-scroll-bar-fade-in-vista-net-or-winapi
// if( PI.IsThemeActive() )
// PI.SetWindowTheme( control.Handle, null, null );
// }
// //// Activate double buffering at the form level. All child controls will be double buffered as well.
// //int windowStyle = PI.GetWindowLong( control.Handle, PI.GWL_EXSTYLE );
// //if( enable )
// // PI.SetWindowLong( control.Handle, PI.GWL_EXSTYLE, (IntPtr)( windowStyle | PI.WS_EX_COMPOSITED ) );
// //else
// // PI.SetWindowLong( control.Handle, PI.GWL_EXSTYLE, (IntPtr)( windowStyle & ~PI.WS_EX_COMPOSITED ) );
//}
private bool IsDropDownListAtPoint(Point pos)
{
IntPtr hWnd = PI.WindowFromPoint(new PI.POINT(pos));
if (hWnd != IntPtr.Zero)
{
string className = PI.GetClassName(hWnd);
if (className == "ComboLBox")
{
return(true);
}
}
return(false);
}
/// <summary>
/// Should a mouse down at the provided point cause an end to popup tracking.
/// </summary>
/// <param name="m">Original message.</param>
/// <param name="pt">Client coordinates point.</param>
/// <returns>True to end tracking; otherwise false.</returns>
public virtual bool DoesCurrentMouseDownEndAllTracking(Message m, Point pt)
{
bool endTracking = !ClientRectangle.Contains(pt);
// The mouse is not over our client area but the focus is
if (endTracking && ContainsFocus)
{
// Get the window handle of the window under this screen point
Point screenPt = PointToScreen(pt);
PI.POINT screenPIPt = new PI.POINT
{
X = screenPt.X,
Y = screenPt.Y
};
IntPtr hWnd = PI.WindowFromPoint(screenPIPt);
// Assuming we got back a valid window handle
if (hWnd != IntPtr.Zero)
{
StringBuilder className = new StringBuilder(256);
int length = PI.GetClassName(hWnd, className, className.Capacity);
// If we got back a valid name
if (length > 0)
{
// If let the message occur as it is being pressed on a combo box
// drop down list and so it will process the message appropriately
if (className.ToString() == "ComboLBox")
{
endTracking = false;
}
}
}
}
return(endTracking);
}