vant-weapp/lib/tabs/index.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var component_1 = require("../common/component");
var touch_1 = require("../mixins/touch");
var utils_1 = require("../common/utils");
component_1.VantComponent({
    mixins: [touch_1.touch],
    classes: ['nav-class', 'tab-class', 'tab-active-class', 'line-class'],
    relation: {
        name: 'tab',
        type: 'descendant',
        linked: function (target) {
            target.index = this.children.length;
            this.children.push(target);
            this.updateTabs();
        },
        unlinked: function (target) {
            this.children = this.children
                .filter(function (child) { return child !== target; })
                .map(function (child, index) {
                child.index = index;
                return child;
            });
            this.updateTabs();
        }
    },
    props: {
        color: {
            type: String,
            observer: 'setLine'
        },
        sticky: Boolean,
        animated: {
            type: Boolean,
            observer: 'setTrack'
        },
        swipeable: Boolean,
        lineWidth: {
            type: [String, Number],
            value: -1,
            observer: 'setLine'
        },
        lineHeight: {
            type: [String, Number],
            value: -1,
            observer: 'setLine'
        },
        titleActiveColor: String,
        titleInactiveColor: String,
        active: {
            type: [String, Number],
            value: 0,
            observer: function (name) {
                if (name !== this.getCurrentName()) {
                    this.setCurrentIndexByName(name);
                }
            }
        },
        type: {
            type: String,
            value: 'line'
        },
        border: {
            type: Boolean,
            value: true
        },
        ellipsis: {
            type: Boolean,
            value: true
        },
        duration: {
            type: Number,
            value: 0.3
        },
        zIndex: {
            type: Number,
            value: 1
        },
        swipeThreshold: {
            type: Number,
            value: 4,
            observer: function (value) {
                this.setData({
                    scrollable: this.children.length > value || !this.data.ellipsis
                });
            }
        },
        offsetTop: {
            type: Number,
            value: 0
        },
        lazyRender: {
            type: Boolean,
            value: true
        },
    },
    data: {
        tabs: [],
        lineStyle: '',
        scrollLeft: 0,
        scrollable: false,
        trackStyle: '',
        currentIndex: null,
        container: null
    },
    beforeCreate: function () {
        this.children = [];
    },
    mounted: function () {
        var _this = this;
        this.setData({
            container: function () { return _this.createSelectorQuery().select('.van-tabs'); }
        });
        this.setLine(true);
        this.setTrack();
        this.scrollIntoView();
    },
    methods: {
        updateTabs: function () {
            var _a = this, _b = _a.children, children = _b === void 0 ? [] : _b, data = _a.data;
            this.setData({
                tabs: children.map(function (child) { return child.data; }),
                scrollable: this.children.length > data.swipeThreshold || !data.ellipsis
            });
            this.setCurrentIndexByName(this.getCurrentName() || data.active);
        },
        trigger: function (eventName) {
            var currentIndex = this.data.currentIndex;
            var child = this.children[currentIndex];
            this.$emit(eventName, {
                index: currentIndex,
                name: child.getComputedName(),
                title: child.data.title
            });
        },
        onTap: function (event) {
            var _this = this;
            var index = event.currentTarget.dataset.index;
            var child = this.children[index];
            if (child.data.disabled) {
                this.trigger('disabled');
            }
            else {
                this.setCurrentIndex(index);
                wx.nextTick(function () {
                    _this.trigger('click');
                });
            }
        },
        // correct the index of active tab
        setCurrentIndexByName: function (name) {
            var _a = this.children, children = _a === void 0 ? [] : _a;
            var matched = children.filter(function (child) { return child.getComputedName() === name; });
            var defaultIndex = (children[0] || {}).index || 0;
            this.setCurrentIndex(matched.length ? matched[0].index : defaultIndex);
        },
        setCurrentIndex: function (currentIndex) {
            var _this = this;
            var _a = this, data = _a.data, _b = _a.children, children = _b === void 0 ? [] : _b;
            if (!utils_1.isDef(currentIndex) ||
                currentIndex >= children.length ||
                currentIndex < 0) {
                return;
            }
            var shouldEmitChange = data.currentIndex !== null;
            this.setData({ currentIndex: currentIndex });
            children.forEach(function (item, index) {
                var active = index === currentIndex;
                if (active !== item.data.active || !item.inited) {
                    item.updateRender(active, _this);
                }
            });
            wx.nextTick(function () {
                _this.setLine();
                _this.setTrack();
                _this.scrollIntoView();
                _this.trigger('input');
                if (shouldEmitChange) {
                    _this.trigger('change');
                }
            });
        },
        getCurrentName: function () {
            var activeTab = this.children[this.data.currentIndex];
            if (activeTab) {
                return activeTab.getComputedName();
            }
        },
        setLine: function (skipTransition) {
            var _this = this;
            if (this.data.type !== 'line') {
                return;
            }
            var _a = this.data, color = _a.color, duration = _a.duration, currentIndex = _a.currentIndex, lineWidth = _a.lineWidth, lineHeight = _a.lineHeight;
            this.getRect('.van-tab', true).then(function (rects) {
                if (rects === void 0) { rects = []; }
                var rect = rects[currentIndex];
                if (rect == null) {
                    return;
                }
                var width = lineWidth !== -1 ? lineWidth : rect.width / 2;
                var height = lineHeight !== -1
                    ? "height: " + utils_1.addUnit(lineHeight) + "; border-radius: " + utils_1.addUnit(lineHeight) + ";"
                    : '';
                var left = rects
                    .slice(0, currentIndex)
                    .reduce(function (prev, curr) { return prev + curr.width; }, 0);
                left += (rect.width - width) / 2;
                var transition = skipTransition
                    ? ''
                    : "transition-duration: " + duration + "s; -webkit-transition-duration: " + duration + "s;";
                _this.setData({
                    lineStyle: "\n            " + height + "\n            width: " + utils_1.addUnit(width) + ";\n            background-color: " + color + ";\n            -webkit-transform: translateX(" + left + "px);\n            transform: translateX(" + left + "px);\n            " + transition + "\n          "
                });
            });
        },
        setTrack: function () {
            var _a = this.data, animated = _a.animated, duration = _a.duration, currentIndex = _a.currentIndex;
            this.setData({
                trackStyle: "\n          transform: translate3d(" + -100 * currentIndex + "%, 0, 0);\n          -webkit-transition-duration: " + (animated ? duration : 0) + "s;\n          transition-duration: " + (animated ? duration : 0) + "s;\n        "
            });
        },
        // scroll active tab into view
        scrollIntoView: function () {
            var _this = this;
            var _a = this.data, currentIndex = _a.currentIndex, scrollable = _a.scrollable;
            if (!scrollable) {
                return;
            }
            Promise.all([
                this.getRect('.van-tab', true),
                this.getRect('.van-tabs__nav')
            ]).then(function (_a) {
                var tabRects = _a[0], navRect = _a[1];
                var tabRect = tabRects[currentIndex];
                var offsetLeft = tabRects
                    .slice(0, currentIndex)
                    .reduce(function (prev, curr) { return prev + curr.width; }, 0);
                _this.setData({
                    scrollLeft: offsetLeft - (navRect.width - tabRect.width) / 2
                });
            });
        },
        onTouchScroll: function (event) {
            this.$emit('scroll', event.detail);
        },
        onTouchStart: function (event) {
            if (!this.data.swipeable)
                return;
            this.touchStart(event);
        },
        onTouchMove: function (event) {
            if (!this.data.swipeable)
                return;
            this.touchMove(event);
        },
        // watch swipe touch end
        onTouchEnd: function () {
            if (!this.data.swipeable)
                return;
            var _a = this.data, tabs = _a.tabs, currentIndex = _a.currentIndex;
            var _b = this, direction = _b.direction, deltaX = _b.deltaX, offsetX = _b.offsetX;
            var minSwipeDistance = 50;
            if (direction === 'horizontal' && offsetX >= minSwipeDistance) {
                if (deltaX > 0 && currentIndex !== 0) {
                    this.setCurrentIndex(currentIndex - 1);
                }
                else if (deltaX < 0 && currentIndex !== tabs.length - 1) {
                    this.setCurrentIndex(currentIndex + 1);
                }
            }
        }
    }
});