Xazn-app/node_modules/vant/es/mixins/popup/index.js

// Context
import { context } from './context';
import { openOverlay, closeOverlay, updateOverlay, removeOverlay } from './overlay'; // Utils

import { on, off, preventDefault } from '../../utils/dom/event';
import { removeNode } from '../../utils/dom/node';
import { getScroller } from '../../utils/dom/scroll'; // Mixins

import { TouchMixin } from '../touch';
import { PortalMixin } from '../portal';
import { CloseOnPopstateMixin } from '../close-on-popstate';
export var popupMixinProps = {
  // Initial rendering animation
  transitionAppear: Boolean,
  // whether to show popup
  value: Boolean,
  // whether to show overlay
  overlay: Boolean,
  // overlay custom style
  overlayStyle: Object,
  // overlay custom class name
  overlayClass: String,
  // whether to close popup when overlay is clicked
  closeOnClickOverlay: Boolean,
  // z-index
  zIndex: [Number, String],
  // prevent body scroll
  lockScroll: {
    type: Boolean,
    default: true
  },
  // whether to lazy render
  lazyRender: {
    type: Boolean,
    default: true
  }
};
export function PopupMixin(options) {
  if (options === void 0) {
    options = {};
  }

  return {
    mixins: [TouchMixin, CloseOnPopstateMixin, PortalMixin({
      afterPortal: function afterPortal() {
        if (this.overlay) {
          updateOverlay();
        }
      }
    })],
    provide: function provide() {
      return {
        vanPopup: this
      };
    },
    props: popupMixinProps,
    data: function data() {
      this.onReopenCallback = [];
      return {
        inited: this.value
      };
    },
    computed: {
      shouldRender: function shouldRender() {
        return this.inited || !this.lazyRender;
      }
    },
    watch: {
      value: function value(val) {
        var type = val ? 'open' : 'close';
        this.inited = this.inited || this.value;
        this[type]();

        if (!options.skipToggleEvent) {
          this.$emit(type);
        }
      },
      overlay: 'renderOverlay'
    },
    mounted: function mounted() {
      if (this.value) {
        this.open();
      }
    },

    /* istanbul ignore next */
    activated: function activated() {
      if (this.shouldReopen) {
        this.$emit('input', true);
        this.shouldReopen = false;
      }
    },
    beforeDestroy: function beforeDestroy() {
      removeOverlay(this);

      if (this.opened) {
        this.removeLock();
      }

      if (this.getContainer) {
        removeNode(this.$el);
      }
    },

    /* istanbul ignore next */
    deactivated: function deactivated() {
      if (this.value) {
        this.close();
        this.shouldReopen = true;
      }
    },
    methods: {
      open: function open() {
        /* istanbul ignore next */
        if (this.$isServer || this.opened) {
          return;
        } // cover default zIndex


        if (this.zIndex !== undefined) {
          context.zIndex = this.zIndex;
        }

        this.opened = true;
        this.renderOverlay();
        this.addLock();
        this.onReopenCallback.forEach(function (callback) {
          callback();
        });
      },
      addLock: function addLock() {
        if (this.lockScroll) {
          on(document, 'touchstart', this.touchStart);
          on(document, 'touchmove', this.onTouchMove);

          if (!context.lockCount) {
            document.body.classList.add('van-overflow-hidden');
          }

          context.lockCount++;
        }
      },
      removeLock: function removeLock() {
        if (this.lockScroll && context.lockCount) {
          context.lockCount--;
          off(document, 'touchstart', this.touchStart);
          off(document, 'touchmove', this.onTouchMove);

          if (!context.lockCount) {
            document.body.classList.remove('van-overflow-hidden');
          }
        }
      },
      close: function close() {
        if (!this.opened) {
          return;
        }

        closeOverlay(this);
        this.opened = false;
        this.removeLock();
        this.$emit('input', false);
      },
      onTouchMove: function onTouchMove(event) {
        this.touchMove(event);
        var direction = this.deltaY > 0 ? '10' : '01';
        var el = getScroller(event.target, this.$el);
        var scrollHeight = el.scrollHeight,
            offsetHeight = el.offsetHeight,
            scrollTop = el.scrollTop;
        var status = '11';
        /* istanbul ignore next */

        if (scrollTop === 0) {
          status = offsetHeight >= scrollHeight ? '00' : '01';
        } else if (scrollTop + offsetHeight >= scrollHeight) {
          status = '10';
        }
        /* istanbul ignore next */


        if (status !== '11' && this.direction === 'vertical' && !(parseInt(status, 2) & parseInt(direction, 2))) {
          preventDefault(event, true);
        }
      },
      renderOverlay: function renderOverlay() {
        var _this = this;

        if (this.$isServer || !this.value) {
          return;
        }

        this.$nextTick(function () {
          _this.updateZIndex(_this.overlay ? 1 : 0);

          if (_this.overlay) {
            openOverlay(_this, {
              zIndex: context.zIndex++,
              duration: _this.duration,
              className: _this.overlayClass,
              customStyle: _this.overlayStyle
            });
          } else {
            closeOverlay(_this);
          }
        });
      },
      updateZIndex: function updateZIndex(value) {
        if (value === void 0) {
          value = 0;
        }

        this.$el.style.zIndex = ++context.zIndex + value;
      },
      onReopen: function onReopen(callback) {
        this.onReopenCallback.push(callback);
      }
    }
  };
}