switch (event->keyval) {
case GDK_space: case GDK_KP_Space: case GDK_Page_Down: case GDK_KP_Page_Down:
gtk_adjustment_set_value(adj, CLAMP(value + page_size, lower, upper - page_size));
switch (event->keyval) {
case GDK_space: case GDK_KP_Space: case GDK_Page_Down: case GDK_KP_Page_Down:
gtk_adjustment_set_value(adj, CLAMP(value + page_size, lower, upper - page_size));