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);
}
