public bool PreFilterMessage(ref Message m)
{
var message = (Utils.ControlExtensions.WindowsMessage)m.Msg;
if (message == ControlExtensions.WindowsMessage.KEYDOWN)
{
switch ((Keys)m.WParam)
{
case Keys.Tab:
if (Keys.ControlKey.IsPressed())
{
var selectedForm = Form.ActiveForm;
var selectedControl = selectedForm.GetFocus();
keydown = true;
if (OnControlTab != null)
{
CtrlTabEventArgs args;
if (selectedControl == null)
{
args = new CtrlTabEventArgs(ControlExtensions.GetFocus());
}
else
{
args = new CtrlTabEventArgs(selectedControl);
}
OnControlTab(this, args);
if (args.CancelOperation)
{
return(true);
}
else if (args.SelectedControl != selectedControl)
{
args.SelectedControl.ActivateOrSetFocus();
return(true);
}
}
if (lastCtrlTabFrom == null || lastCtrlTabFrom == selectedControl)
{
lastCtrlTabFrom = selectedControl;
DoControlTab(Keys.ShiftKey.IsPressed());
}
else if (lastCtrlTabFrom != null)
{
lastCtrlTabFrom.ActivateOrSetFocus();
lastCtrlTabFrom = selectedControl;
}
return(true);
}
break;
}
}
else if (message == ControlExtensions.WindowsMessage.KEYUP)
{
if (!Keys.ControlKey.IsPressed())
{
if (keydown)
{
keydown = false;
if (PostControlTab != null)
{
PostControlTab(this, EventArgs.Empty);
}
}
}
}
return(false);
}
