+
+bool
+StereoPanner::on_key_press_event (GdkEventKey* ev)
+{
+ double one_degree = 1.0/180.0;
+ double pv = position_control->get_value(); // 0..1.0 ; 0 = left
+ double wv = width_control->get_value(); // 0..1.0 ; 0 = left
+ double step;
+
+ if (Keyboard::modifier_state_contains (ev->state, Keyboard::PrimaryModifier)) {
+ step = one_degree;
+ } else {
+ step = one_degree * 5.0;
+ }
+
+ switch (ev->keyval) {
+ case GDK_Up:
+ wv += step;
+ width_control->set_value (wv);
+ break;
+ case GDK_Left:
+ pv -= step;
+ position_control->set_value (pv);
+ break;
+ case GDK_Right:
+ pv += step;
+ position_control->set_value (pv);
+ break;
+ case GDK_Down:
+ wv -= step;
+ width_control->set_value (wv);
+ break;
+ default:
+ return forward_key_press (ev);
+ }
+
+ return true;
+}
+
+bool
+StereoPanner::on_key_release_event (GdkEventKey* ev)
+{
+ return true;
+}
+
+bool
+StereoPanner::on_enter_notify_event (GdkEventCrossing* ev)
+{
+ grab_focus ();
+ Keyboard::magic_widget_grab_focus ();
+ return false;
+}
+
+bool
+StereoPanner::on_leave_notify_event (GdkEventCrossing*)
+{
+ Keyboard::magic_widget_drop_focus ();
+ return false;
+}