jiaojiu/node_modules/vant/es/image-preview/ImagePreview.js

// Utils
import { bem, createComponent } from './shared'; // Mixins

import { PopupMixin } from '../mixins/popup';
import { TouchMixin } from '../mixins/touch';
import { BindEventMixin } from '../mixins/bind-event'; // Components

import Icon from '../icon';
import Swipe from '../swipe';
import ImagePreviewItem from './ImagePreviewItem';
export default createComponent({
  mixins: [TouchMixin, PopupMixin({
    skipToggleEvent: true
  }), BindEventMixin(function (bind) {
    bind(window, 'resize', this.resize, true);
    bind(window, 'orientationchange', this.resize, true);
  })],
  props: {
    className: null,
    closeable: Boolean,
    asyncClose: Boolean,
    showIndicators: Boolean,
    images: {
      type: Array,
      default: function _default() {
        return [];
      }
    },
    loop: {
      type: Boolean,
      default: true
    },
    overlay: {
      type: Boolean,
      default: true
    },
    minZoom: {
      type: [Number, String],
      default: 1 / 3
    },
    maxZoom: {
      type: [Number, String],
      default: 3
    },
    showIndex: {
      type: Boolean,
      default: true
    },
    swipeDuration: {
      type: [Number, String],
      default: 500
    },
    startPosition: {
      type: [Number, String],
      default: 0
    },
    overlayClass: {
      type: String,
      default: bem('overlay')
    },
    closeIcon: {
      type: String,
      default: 'clear'
    },
    closeOnPopstate: {
      type: Boolean,
      default: true
    },
    closeIconPosition: {
      type: String,
      default: 'top-right'
    }
  },
  data: function data() {
    return {
      active: 0,
      rootWidth: 0,
      rootHeight: 0,
      doubleClickTimer: null
    };
  },
  mounted: function mounted() {
    this.resize();
  },
  watch: {
    startPosition: 'setActive',
    value: function value(val) {
      var _this = this;

      if (val) {
        this.setActive(+this.startPosition);
        this.$nextTick(function () {
          _this.resize();

          _this.$refs.swipe.swipeTo(+_this.startPosition, {
            immediate: true
          });
        });
      } else {
        this.$emit('close', {
          index: this.active,
          url: this.images[this.active]
        });
      }
    }
  },
  methods: {
    resize: function resize() {
      if (this.$el && this.$el.getBoundingClientRect) {
        var rect = this.$el.getBoundingClientRect();
        this.rootWidth = rect.width;
        this.rootHeight = rect.height;
      }
    },
    emitClose: function emitClose() {
      if (!this.asyncClose) {
        this.$emit('input', false);
      }
    },
    emitScale: function emitScale(args) {
      this.$emit('scale', args);
    },
    setActive: function setActive(active) {
      if (active !== this.active) {
        this.active = active;
        this.$emit('change', active);
      }
    },
    genIndex: function genIndex() {
      var h = this.$createElement;

      if (this.showIndex) {
        return h("div", {
          "class": bem('index')
        }, [this.slots('index', {
          index: this.active
        }) || this.active + 1 + " / " + this.images.length]);
      }
    },
    genCover: function genCover() {
      var h = this.$createElement;
      var cover = this.slots('cover');

      if (cover) {
        return h("div", {
          "class": bem('cover')
        }, [cover]);
      }
    },
    genImages: function genImages() {
      var _this2 = this;

      var h = this.$createElement;
      return h(Swipe, {
        "ref": "swipe",
        "attrs": {
          "lazyRender": true,
          "loop": this.loop,
          "duration": this.swipeDuration,
          "initialSwipe": this.startPosition,
          "showIndicators": this.showIndicators,
          "indicatorColor": "white"
        },
        "class": bem('swipe'),
        "on": {
          "change": this.setActive
        }
      }, [this.images.map(function (image) {
        return h(ImagePreviewItem, {
          "attrs": {
            "src": image,
            "show": _this2.value,
            "active": _this2.active,
            "maxZoom": _this2.maxZoom,
            "minZoom": _this2.minZoom,
            "rootWidth": _this2.rootWidth,
            "rootHeight": _this2.rootHeight
          },
          "on": {
            "scale": _this2.emitScale,
            "close": _this2.emitClose
          }
        });
      })]);
    },
    genClose: function genClose() {
      var h = this.$createElement;

      if (this.closeable) {
        return h(Icon, {
          "attrs": {
            "role": "button",
            "name": this.closeIcon
          },
          "class": bem('close-icon', this.closeIconPosition),
          "on": {
            "click": this.emitClose
          }
        });
      }
    },
    onClosed: function onClosed() {
      this.$emit('closed');
    },
    // @exposed-api
    swipeTo: function swipeTo(index, options) {
      if (this.$refs.swipe) {
        this.$refs.swipe.swipeTo(index, options);
      }
    }
  },
  render: function render() {
    var h = arguments[0];

    if (!this.shouldRender) {
      return;
    }

    return h("transition", {
      "attrs": {
        "name": "van-fade"
      },
      "on": {
        "afterLeave": this.onClosed
      }
    }, [h("div", {
      "directives": [{
        name: "show",
        value: this.value
      }],
      "class": [bem(), this.className]
    }, [this.genClose(), this.genImages(), this.genIndex(), this.genCover()])]);
  }
});