protected void GrabTheFocus()
{
oldFocus = WindowsAPI.GetFocus();
// Is the focus on a control/window?
if ( oldFocus != IntPtr.Zero)
{
IntPtr hParent = WindowsAPI.GetParent( oldFocus);
// Did we find a parent window?
if (hParent != IntPtr.Zero)
{
// Create a new destination for the focus
focusCatcher = new FocusCatcher(hParent);
// Park focus at the temporary window
WindowsAPI.SetFocus( focusCatcher.Handle);
// Kill any capturing of the mouse
WindowsAPI.ReleaseCapture();
}
}
grabFocus = false;
}
protected void ReturnTheFocus()
{
// Restore focus to origin
WindowsAPI.SetFocus( oldFocus);
// Did we use an temporary parking location?
if ( focusCatcher != null)
{
// Kill it
focusCatcher.DestroyHandle();
focusCatcher = null;
}
// Reset state
oldFocus = IntPtr.Zero;
}
public PopupMenu()
{
// Create collection objects
drawCommands = new ArrayList();
menuCommands = new MenuCommandCollection();
// Default the properties
returnDir = 0;
extraSize = 0;
popupItem = -1;
trackItem = -1;
childMenu = null;
exitLoop = false;
popupDown = true;
mouseOver = false;
grabFocus = false;
excludeTop = true;
popupRight = true;
parentMenu = null;
excludeOffset = 0;
focusCatcher = null;
parentControl = null;
returnCommand = null;
oldFocus = IntPtr.Zero;
showInfrequent = false;
style = VisualStyle.IDE;
lastMousePos = new Point(-1,-1);
direction = Direction.Horizontal;
textFont = SystemInformation.MenuFont;
// Create and initialise the timer object (but do not start it running!)
timer = new Timer();
timer.Interval = selectionDelay;
timer.Tick += new EventHandler(OnTimerExpire);
}