Method scrollvdown

src/elements/scrollable.rs:181–190

(&self, e: &MouseEvent, _: f32)

    //vertical

    fn scrollvdown(&self, e: &MouseEvent, _: f32) {
        let mut state = self.state.borrow_mut();
        if !state.visible_v {
            return;
        }

        state.drag_v = true;
        state.drag_y = e.y as f32 - self.scrollv.y();
        self.scrollv.capture();
    }

    fn scrollvup(&self, e: &MouseEvent, _: f32) {
        self.state.borrow_mut().drag_v = false;