public bool PreFilterMessage(ref Message m)
{
// If we have suspended operation....
if (_suspended > 0)
{
// Intercept the non-client mouse move to prevent the custom
// chrome of the form from providing hot tracking feedback
if (m.Msg == PI.WM_NCMOUSEMOVE)
{
return(true);
}
// A mouse move can occur because a context menu is showing with a popup also
// already showing. We suppress the mouse move to prevent tracking of the popup
if (m.Msg == PI.WM_MOUSEMOVE)
{
return(ProcessMouseMoveWithCMS(ref m));
}
return(false);
}
if (_current != null)
{
// If the popup has been become disposed
if (_current.IsDisposed)
{
EndCurrentTracking();
return(false);
}
else
{
// Get the active window
IntPtr activeWindow = PI.GetActiveWindow();
// Is there a change in active window?
if (activeWindow != _activeWindow)
{
// If the current window has become active, ask popup if that is allowed
if ((activeWindow == _current.Handle) && _current.AllowBecomeActiveWhenCurrent)
{
_activeWindow = _current.Handle;
}
else
{
bool focus = _current.ContainsFocus;
if (!focus)
{
VisualPopup[] popups = _stack.ToArray();
// For from last to first for any popup that has the focus
for (int i = popups.Length - 1; i >= 0; i--)
{
if (!popups[i].IsDisposed)
{
if (popups[i].ContainsFocus)
{
focus = true;
break;
}
}
}
}
// If the change in active window (focus) is not to the current
// or a stacked popup then we need to pull down the entire stack
// as focus has been shifted away from the use of any popup.
if (!focus)
{
EndAllTracking();
return(false);
}
}
}
}
// We only intercept and handle keyboard and mouse messages
if (!IsKeyOrMouseMessage(ref m))
{
return(false);
}
switch (m.Msg)
{
case PI.WM_KEYDOWN:
case PI.WM_SYSKEYDOWN:
// If the popup is telling us to redirect keyboard to itself
if (!_current.KeyboardInert)
{
// If the focus is not inside the actual current tracking popup
// then we need to manually translate the message to ensure that
// KeyPress events occur for the current popup.
if (!_current.ContainsFocus)
{
PI.MSG msg = new PI.MSG
{
hwnd = m.HWnd,
message = m.Msg,
lParam = m.LParam,
wParam = m.WParam
};
PI.TranslateMessage(ref msg);
}
return(ProcessKeyboard(ref m));
}
break;
case PI.WM_CHAR:
case PI.WM_KEYUP:
case PI.WM_DEADCHAR:
case PI.WM_SYSCHAR:
case PI.WM_SYSKEYUP:
case PI.WM_SYSDEADCHAR:
// If the popup is telling us to redirect keyboard to itself
if (!_current.KeyboardInert)
{
return(ProcessKeyboard(ref m));
}
break;
case PI.WM_MOUSEMOVE:
case PI.WM_NCMOUSEMOVE:
return(ProcessMouseMove(ref m));
case PI.WM_LBUTTONDOWN:
case PI.WM_RBUTTONDOWN:
case PI.WM_MBUTTONDOWN:
return(ProcessClientMouseDown(ref m));
case PI.WM_NCLBUTTONDOWN:
case PI.WM_NCRBUTTONDOWN:
case PI.WM_NCMBUTTONDOWN:
return(ProcessNonClientMouseDown(ref m));
}
}
return(false);
}
