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node_modules/vant/es/tabs/index.js

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+// Utils
+import { createNamespace, isDef, addUnit } from '../utils';
+import { scrollLeftTo, scrollTopTo } from './utils';
+import { route } from '../utils/router';
+import { isHidden } from '../utils/dom/style';
+import { on, off } from '../utils/dom/event';
+import { unitToPx } from '../utils/format/unit';
+import { BORDER_TOP_BOTTOM } from '../utils/constant';
+import { callInterceptor } from '../utils/interceptor';
+import { getScroller, getVisibleTop, getElementTop, getVisibleHeight, setRootScrollTop } from '../utils/dom/scroll'; // Mixins
+
+import { ParentMixin } from '../mixins/relation';
+import { BindEventMixin } from '../mixins/bind-event'; // Components
+
+import Title from './Title';
+import Sticky from '../sticky';
+import Content from './Content';
+
+var _createNamespace = createNamespace('tabs'),
+    createComponent = _createNamespace[0],
+    bem = _createNamespace[1];
+
+export default createComponent({
+  mixins: [ParentMixin('vanTabs'), BindEventMixin(function (bind) {
+    if (!this.scroller) {
+      this.scroller = getScroller(this.$el);
+    }
+
+    bind(window, 'resize', this.resize, true);
+
+    if (this.scrollspy) {
+      bind(this.scroller, 'scroll', this.onScroll, true);
+    }
+  })],
+  inject: {
+    vanPopup: {
+      default: null
+    }
+  },
+  model: {
+    prop: 'active'
+  },
+  props: {
+    color: String,
+    border: Boolean,
+    sticky: Boolean,
+    animated: Boolean,
+    swipeable: Boolean,
+    scrollspy: Boolean,
+    background: String,
+    lineWidth: [Number, String],
+    lineHeight: [Number, String],
+    beforeChange: Function,
+    titleActiveColor: String,
+    titleInactiveColor: String,
+    type: {
+      type: String,
+      default: 'line'
+    },
+    active: {
+      type: [Number, String],
+      default: 0
+    },
+    ellipsis: {
+      type: Boolean,
+      default: true
+    },
+    duration: {
+      type: [Number, String],
+      default: 0.3
+    },
+    offsetTop: {
+      type: [Number, String],
+      default: 0
+    },
+    lazyRender: {
+      type: Boolean,
+      default: true
+    },
+    swipeThreshold: {
+      type: [Number, String],
+      default: 5
+    }
+  },
+  data: function data() {
+    return {
+      position: '',
+      currentIndex: null,
+      lineStyle: {
+        backgroundColor: this.color
+      }
+    };
+  },
+  computed: {
+    // whether the nav is scrollable
+    scrollable: function scrollable() {
+      return this.children.length > this.swipeThreshold || !this.ellipsis;
+    },
+    navStyle: function navStyle() {
+      return {
+        borderColor: this.color,
+        background: this.background
+      };
+    },
+    currentName: function currentName() {
+      var activeTab = this.children[this.currentIndex];
+
+      if (activeTab) {
+        return activeTab.computedName;
+      }
+    },
+    offsetTopPx: function offsetTopPx() {
+      return unitToPx(this.offsetTop);
+    },
+    scrollOffset: function scrollOffset() {
+      if (this.sticky) {
+        return this.offsetTopPx + this.tabHeight;
+      }
+
+      return 0;
+    }
+  },
+  watch: {
+    color: 'setLine',
+    active: function active(name) {
+      if (name !== this.currentName) {
+        this.setCurrentIndexByName(name);
+      }
+    },
+    children: function children() {
+      var _this = this;
+
+      this.setCurrentIndexByName(this.active);
+      this.setLine();
+      this.$nextTick(function () {
+        _this.scrollIntoView(true);
+      });
+    },
+    currentIndex: function currentIndex() {
+      this.scrollIntoView();
+      this.setLine(); // scroll to correct position
+
+      if (this.stickyFixed && !this.scrollspy) {
+        setRootScrollTop(Math.ceil(getElementTop(this.$el) - this.offsetTopPx));
+      }
+    },
+    scrollspy: function scrollspy(val) {
+      if (val) {
+        on(this.scroller, 'scroll', this.onScroll, true);
+      } else {
+        off(this.scroller, 'scroll', this.onScroll);
+      }
+    }
+  },
+  mounted: function mounted() {
+    var _this2 = this;
+
+    this.init(); // https://github.com/vant-ui/vant/issues/7959
+
+    if (this.vanPopup) {
+      this.vanPopup.onReopen(function () {
+        _this2.setLine();
+      });
+    }
+  },
+  activated: function activated() {
+    this.init();
+    this.setLine();
+  },
+  methods: {
+    // @exposed-api
+    resize: function resize() {
+      this.setLine();
+    },
+    init: function init() {
+      var _this3 = this;
+
+      this.$nextTick(function () {
+        _this3.inited = true;
+        _this3.tabHeight = getVisibleHeight(_this3.$refs.wrap);
+
+        _this3.scrollIntoView(true);
+      });
+    },
+    // update nav bar style
+    setLine: function setLine() {
+      var _this4 = this;
+
+      var shouldAnimate = this.inited;
+      this.$nextTick(function () {
+        var titles = _this4.$refs.titles;
+
+        if (!titles || !titles[_this4.currentIndex] || _this4.type !== 'line' || isHidden(_this4.$el)) {
+          return;
+        }
+
+        var title = titles[_this4.currentIndex].$el;
+        var lineWidth = _this4.lineWidth,
+            lineHeight = _this4.lineHeight;
+        var left = title.offsetLeft + title.offsetWidth / 2;
+        var lineStyle = {
+          width: addUnit(lineWidth),
+          backgroundColor: _this4.color,
+          transform: "translateX(" + left + "px) translateX(-50%)"
+        };
+
+        if (shouldAnimate) {
+          lineStyle.transitionDuration = _this4.duration + "s";
+        }
+
+        if (isDef(lineHeight)) {
+          var height = addUnit(lineHeight);
+          lineStyle.height = height;
+          lineStyle.borderRadius = height;
+        }
+
+        _this4.lineStyle = lineStyle;
+      });
+    },
+    // correct the index of active tab
+    setCurrentIndexByName: function setCurrentIndexByName(name) {
+      var matched = this.children.filter(function (tab) {
+        return tab.computedName === name;
+      });
+      var defaultIndex = (this.children[0] || {}).index || 0;
+      this.setCurrentIndex(matched.length ? matched[0].index : defaultIndex);
+    },
+    setCurrentIndex: function setCurrentIndex(currentIndex) {
+      var newIndex = this.findAvailableTab(currentIndex);
+
+      if (!isDef(newIndex)) {
+        return;
+      }
+
+      var newTab = this.children[newIndex];
+      var newName = newTab.computedName;
+      var shouldEmitChange = this.currentIndex !== null;
+      this.currentIndex = newIndex;
+
+      if (newName !== this.active) {
+        this.$emit('input', newName);
+
+        if (shouldEmitChange) {
+          this.$emit('change', newName, newTab.title);
+        }
+      }
+    },
+    findAvailableTab: function findAvailableTab(index) {
+      var diff = index < this.currentIndex ? -1 : 1;
+
+      while (index >= 0 && index < this.children.length) {
+        if (!this.children[index].disabled) {
+          return index;
+        }
+
+        index += diff;
+      }
+    },
+    // emit event when clicked
+    onClick: function onClick(item, index) {
+      var _this5 = this;
+
+      var _this$children$index = this.children[index],
+          title = _this$children$index.title,
+          disabled = _this$children$index.disabled,
+          computedName = _this$children$index.computedName;
+
+      if (disabled) {
+        this.$emit('disabled', computedName, title);
+      } else {
+        callInterceptor({
+          interceptor: this.beforeChange,
+          args: [computedName],
+          done: function done() {
+            _this5.setCurrentIndex(index);
+
+            _this5.scrollToCurrentContent();
+          }
+        });
+        this.$emit('click', computedName, title);
+        route(item.$router, item);
+      }
+    },
+    // scroll active tab into view
+    scrollIntoView: function scrollIntoView(immediate) {
+      var titles = this.$refs.titles;
+
+      if (!this.scrollable || !titles || !titles[this.currentIndex]) {
+        return;
+      }
+
+      var nav = this.$refs.nav;
+      var title = titles[this.currentIndex].$el;
+      var to = title.offsetLeft - (nav.offsetWidth - title.offsetWidth) / 2;
+      scrollLeftTo(nav, to, immediate ? 0 : +this.duration);
+    },
+    onSticktScroll: function onSticktScroll(params) {
+      this.stickyFixed = params.isFixed;
+      this.$emit('scroll', params);
+    },
+    // @exposed-api
+    scrollTo: function scrollTo(name) {
+      var _this6 = this;
+
+      this.$nextTick(function () {
+        _this6.setCurrentIndexByName(name);
+
+        _this6.scrollToCurrentContent(true);
+      });
+    },
+    scrollToCurrentContent: function scrollToCurrentContent(immediate) {
+      var _this7 = this;
+
+      if (immediate === void 0) {
+        immediate = false;
+      }
+
+      if (this.scrollspy) {
+        var target = this.children[this.currentIndex];
+        var el = target == null ? void 0 : target.$el;
+
+        if (el) {
+          var to = getElementTop(el, this.scroller) - this.scrollOffset;
+          this.lockScroll = true;
+          scrollTopTo(this.scroller, to, immediate ? 0 : +this.duration, function () {
+            _this7.lockScroll = false;
+          });
+        }
+      }
+    },
+    onScroll: function onScroll() {
+      if (this.scrollspy && !this.lockScroll) {
+        var index = this.getCurrentIndexOnScroll();
+        this.setCurrentIndex(index);
+      }
+    },
+    getCurrentIndexOnScroll: function getCurrentIndexOnScroll() {
+      var children = this.children;
+
+      for (var index = 0; index < children.length; index++) {
+        var top = getVisibleTop(children[index].$el);
+
+        if (top > this.scrollOffset) {
+          return index === 0 ? 0 : index - 1;
+        }
+      }
+
+      return children.length - 1;
+    }
+  },
+  render: function render() {
+    var _this8 = this,
+        _ref;
+
+    var h = arguments[0];
+    var type = this.type,
+        animated = this.animated,
+        scrollable = this.scrollable;
+    var Nav = this.children.map(function (item, index) {
+      var _item$badge;
+
+      return h(Title, {
+        "ref": "titles",
+        "refInFor": true,
+        "attrs": {
+          "type": type,
+          "dot": item.dot,
+          "info": (_item$badge = item.badge) != null ? _item$badge : item.info,
+          "title": item.title,
+          "color": _this8.color,
+          "isActive": index === _this8.currentIndex,
+          "disabled": item.disabled,
+          "scrollable": scrollable,
+          "activeColor": _this8.titleActiveColor,
+          "inactiveColor": _this8.titleInactiveColor
+        },
+        "style": item.titleStyle,
+        "class": item.titleClass,
+        "scopedSlots": {
+          default: function _default() {
+            return item.slots('title');
+          }
+        },
+        "on": {
+          "click": function click() {
+            _this8.onClick(item, index);
+          }
+        }
+      });
+    });
+    var Wrap = h("div", {
+      "ref": "wrap",
+      "class": [bem('wrap', {
+        scrollable: scrollable
+      }), (_ref = {}, _ref[BORDER_TOP_BOTTOM] = type === 'line' && this.border, _ref)]
+    }, [h("div", {
+      "ref": "nav",
+      "attrs": {
+        "role": "tablist"
+      },
+      "class": bem('nav', [type, {
+        complete: this.scrollable
+      }]),
+      "style": this.navStyle
+    }, [this.slots('nav-left'), Nav, type === 'line' && h("div", {
+      "class": bem('line'),
+      "style": this.lineStyle
+    }), this.slots('nav-right')])]);
+    return h("div", {
+      "class": bem([type])
+    }, [this.sticky ? h(Sticky, {
+      "attrs": {
+        "container": this.$el,
+        "offsetTop": this.offsetTop
+      },
+      "on": {
+        "scroll": this.onSticktScroll
+      }
+    }, [Wrap]) : Wrap, h(Content, {
+      "attrs": {
+        "count": this.children.length,
+        "animated": animated,
+        "duration": this.duration,
+        "swipeable": this.swipeable,
+        "currentIndex": this.currentIndex
+      },
+      "on": {
+        "change": this.setCurrentIndex
+      }
+    }, [this.slots()])]);
+  }
+});