vant-weapp/lib/sticky/index.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var component_1 = require("../common/component");
var page_scroll_1 = require("../mixins/page-scroll");
var ROOT_ELEMENT = '.van-sticky';
component_1.VantComponent({
    props: {
        zIndex: {
            type: Number,
            value: 99
        },
        offsetTop: {
            type: Number,
            value: 0,
            observer: 'onScroll'
        },
        disabled: {
            type: Boolean,
            observer: 'onScroll'
        },
        container: {
            type: null,
            observer: 'onScroll'
        }
    },
    mixins: [
        page_scroll_1.pageScrollMixin(function (event) {
            this.onScroll(event);
        })
    ],
    data: {
        height: 0,
        fixed: false,
        transform: 0
    },
    mounted: function () {
        this.onScroll();
    },
    methods: {
        onScroll: function (_a) {
            var _this = this;
            var scrollTop = (_a === void 0 ? {} : _a).scrollTop;
            var _b = this.data, container = _b.container, offsetTop = _b.offsetTop, disabled = _b.disabled;
            if (disabled) {
                this.setDataAfterDiff({
                    fixed: false,
                    transform: 0
                });
                return;
            }
            this.scrollTop = scrollTop || this.scrollTop;
            if (typeof container === 'function') {
                Promise.all([this.getRect(ROOT_ELEMENT), this.getContainerRect()]).then(function (_a) {
                    var root = _a[0], container = _a[1];
                    if (offsetTop + root.height > container.height + container.top) {
                        _this.setDataAfterDiff({
                            fixed: false,
                            transform: container.height - root.height
                        });
                    }
                    else if (offsetTop >= root.top) {
                        _this.setDataAfterDiff({
                            fixed: true,
                            height: root.height,
                            transform: 0
                        });
                    }
                    else {
                        _this.setDataAfterDiff({ fixed: false, transform: 0 });
                    }
                });
                return;
            }
            this.getRect(ROOT_ELEMENT).then(function (root) {
                if (offsetTop >= root.top) {
                    _this.setDataAfterDiff({ fixed: true, height: root.height });
                    _this.transform = 0;
                }
                else {
                    _this.setDataAfterDiff({ fixed: false });
                }
            });
        },
        setDataAfterDiff: function (data) {
            var _this = this;
            wx.nextTick(function () {
                var diff = Object.keys(data).reduce(function (prev, key) {
                    if (data[key] !== _this.data[key]) {
                        prev[key] = data[key];
                    }
                    return prev;
                }, {});
                _this.setData(diff);
                _this.$emit('scroll', {
                    scrollTop: _this.scrollTop,
                    isFixed: data.fixed || _this.data.fixed
                });
            });
        },
        getContainerRect: function () {
            var nodesRef = this.data.container();
            return new Promise(function (resolve) {
                return nodesRef.boundingClientRect(resolve).exec();
            });
        }
    }
});