import event from '../../common/event';

Component({
    properties: {
        gototop: {
            type: Boolean
        }
    },
    data: {
        hidden: true
    },
    attached() {
        event.on('pageScroll', data => {
            const {scrollTop} = data;
            const change = scrollTop > 600;

            if (this.data.hidden === change) {
                this.setData({
                    hidden: !this.data.hidden
                });
            }
        });

        event.on('gototop', () => {
            this.setData({
                hidden: true
            });
        });
    }
});