request release {
}

request client_scroll (sender) {
    x: f32,
    y: f32,
}

request client_scroll_discrete (sender) {
    x: i32,
    y: i32,
}

request client_scroll_stop (sender) {
    x: u32,
    y: u32,
    is_cancel: u32,
}

event destroyed {
    serial: u32,
}

event server_scroll (receiver) {
    x: f32,
    y: f32,
}

event server_scroll_discrete (receiver) {
    x: i32,
    y: i32,
}

event server_scroll_stop (receiver) {
    x: u32,
    y: u32,
    is_cancel: u32,
}