combination/miniprogram/miniprogram_npm/@miniprogram-component-plus/index-list/index.js

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/***/ 4:
/***/ (function(module, exports, __webpack_require__) {

"use strict";


var throttle = function throttle(func, wait, options) {
    var context = void 0;
    var args = void 0;
    var result = void 0;
    var timeout = null;
    var previous = 0;
    if (!options) options = {};
    var later = function later() {
        previous = options.leading === false ? 0 : Date.now();
        timeout = null;
        result = func.apply(context, args);
        if (!timeout) context = args = null;
    };
    return function () {
        var now = Date.now();
        if (!previous && options.leading === false) previous = now;
        var remaining = wait - (now - previous);
        context = this;
        args = arguments;
        if (remaining <= 0 || remaining > wait) {
            clearTimeout(timeout);
            timeout = null;
            previous = now;
            result = func.apply(context, args);
            if (!timeout) context = args = null;
        } else if (!timeout && options.trailing !== false) {
            timeout = setTimeout(later, remaining);
        }
        return result;
    };
};
Component({
    options: {
        addGlobalClass: true,
        pureDataPattern: /^_/
    },
    properties: {
        list: {
            type: Array,
            value: [],
            observer: function observer(newVal) {
                var _this = this;

                if (newVal.length === 0) return;
                var data = this.data;
                var alphabet = data.list.map(function (item) {
                    return item.alpha;
                });
                this.setData({
                    alphabet: alphabet,
                    current: alphabet[0]
                }, function () {
                    _this.computedSize();
                });
            }
        },
        vibrated: {
            type: Boolean,
            value: true
        }
    },
    data: {
        windowHeight: 612,
        current: 'A',
        intoView: '',
        touching: false,
        alphabet: [],
        _tops: [],
        _anchorItemH: 0,
        _anchorItemW: 0,
        _anchorTop: 0,
        _listUpperBound: 0
    },
    lifetimes: {
        created: function created() {},
        attached: function attached() {
            this.__scrollTo = throttle(this._scrollTo, 100, {});
            this.__onScroll = throttle(this._onScroll, 100, {});

            var _wx$getSystemInfoSync = wx.getSystemInfoSync(),
                windowHeight = _wx$getSystemInfoSync.windowHeight;

            this.setData({ windowHeight: windowHeight });
        }
    },
    methods: {
        choose: function choose(e) {
            var item = e.target.dataset.item;
            this.triggerEvent('choose', { item: item });
        },
        scrollTo: function scrollTo(e) {
            this.__scrollTo(e);
        },
        _scrollTo: function _scrollTo(e) {
            var data = this.data;
            var clientY = e.changedTouches[0].clientY;
            var index = Math.floor((clientY - data._anchorTop) / data._anchorItemH);
            var current = data.alphabet[index];
            this.setData({ current: current, intoView: current, touching: true });
            if (data.vibrated) wx.vibrateShort();
        },
        computedSize: function computedSize() {
            var data = this.data;
            var query = this.createSelectorQuery();
            query.selectAll('.index_list_item').boundingClientRect(function (rects) {
                var result = rects;
                data._tops = result.map(function (item) {
                    return item.top;
                });
            }).exec();
            query.select('.anchor-list').boundingClientRect(function (rect) {
                data._anchorItemH = rect.height / data.alphabet.length;
                data._anchorItemW = rect.width;
                data._anchorTop = rect.top;
            }).exec();
            query.select('.page-select-index').boundingClientRect(function (rect) {
                data._listUpperBound = rect.top;
            });
        },
        removeTouching: function removeTouching() {
            var _this2 = this;

            setTimeout(function () {
                _this2.setData({ touching: false });
            }, 150);
        },
        onScroll: function onScroll(e) {
            this.__onScroll(e);
        },
        _onScroll: function _onScroll(e) {
            var data = this.data;
            var _tops = data._tops,
                alphabet = data.alphabet;

            var scrollTop = e.detail.scrollTop;
            var current = '';
            if (scrollTop < _tops[0]) {
                current = alphabet[0];
            } else {
                for (var i = 0, len = _tops.length; i < len - 1; i++) {
                    if (scrollTop >= _tops[i] && scrollTop < _tops[i + 1]) {
                        current = alphabet[i];
                    }
                }
            }
            if (!current) current = alphabet[alphabet.length - 1];
            this.setData({ current: current });
        }
    }
});

/***/ })

/******/ });