[gtkmm] moving window

[SMS WebMaster <sms 4-sms com>]

Hi

can anyone tell me what is the wrong in this code (this code to allow me 
to move the window when I press it and move the mouse, but the problem 
is thta I have to move the mouse very slow to make this code work, if I 
mouse the mouse fast the window will not move with the mouse ):



  PicEvent.set_events(Gdk::BUTTON_PRESS_MASK | Gdk::POINTER_MOTION_MASK 
 | Gdk::POINTER_MOTION_HINT_MASK);
  PicEvent.signal_motion_notify_event().connect(
     SigC::slot(*this, &MainWindow::window_motion) );
  PicEvent.signal_button_press_event().connect(
    SigC::slot(*this, &MainWindow::on_PICEvent_button_press) );
  PicEvent.signal_button_release_event().connect(
    SigC::slot(*this, &MainWindow::on_PICEvent_button_release) );


bool MainWindow::window_motion (GdkEventMotion* event)
{
	gint x;
	gint y;
	gint mx, my;
	double x_delta;
	double y_delta;
	this->get_pointer (mx, my);
	
	if (!dragging) {

		return TRUE;
	}

	x_delta = event->x_root - drag_x;
	y_delta = event->y_root - drag_y;

	get_window()->get_root_origin (x, y);
	get_window()->move ((gint) floor (x + x_delta), (gint) floor (y + 
y_delta));
	
	drag_x = event->x_root;
	drag_y = event->y_root;

	return TRUE;
}


bool MainWindow::on_TimeEvent_button_press(GdkEventButton* event)
{
  return true;
}

bool MainWindow::on_PICEvent_button_press(GdkEventButton* event)
{
  dragging=TRUE;
	drag_x = event->x_root;
	drag_y = event->y_root;
  return true;
}
bool MainWindow::on_PICEvent_button_release(GdkEventButton* event)
{
  dragging=FALSE;
  return true;
}


Any help please ?

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