Method scrollhdown

src/elements/scroll_view.rs:209–218

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

    //horizontal

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

        state.drag_h = true;
        state.drag_x = e.x as f32 - self.scrollh.x();
        self.scrollh.capture();
    }

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