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  | var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) { 
 |      var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d; 
 |      if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc); 
 |      else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r; 
 |      return c > 3 && r && Object.defineProperty(target, key, r), r; 
 |  }; 
 |  import { SuperComponent, wxComponent } from '../common/src/index'; 
 |  import config from '../common/config'; 
 |  import props from './props'; 
 |  import { calcIcon } from '../common/utils'; 
 |  const { prefix } = config; 
 |  const name = `${prefix}-back-top`; 
 |  let BackTop = class BackTop extends SuperComponent { 
 |      constructor() { 
 |          super(...arguments); 
 |          this.externalClasses = [`${prefix}-class`, `${prefix}-class-icon`, `${prefix}-class-text`]; 
 |          this.options = { 
 |              multipleSlots: true, 
 |          }; 
 |          this.properties = props; 
 |          this.relations = { 
 |              '../pull-down-refresh/pull-down-refresh': { 
 |                  type: 'ancestor', 
 |              }, 
 |          }; 
 |          this.data = { 
 |              prefix, 
 |              classPrefix: name, 
 |              _icon: null, 
 |              hidden: true, 
 |          }; 
 |          this.observers = { 
 |              icon() { 
 |                  this.setIcon(); 
 |              }, 
 |              scrollTop(value) { 
 |                  const { visibilityHeight } = this.properties; 
 |                  this.setData({ hidden: value < visibilityHeight }); 
 |              }, 
 |          }; 
 |          this.lifetimes = { 
 |              ready() { 
 |                  const { icon } = this.properties; 
 |                  this.setIcon(icon); 
 |              }, 
 |          }; 
 |          this.methods = { 
 |              setIcon(v) { 
 |                  this.setData({ 
 |                      _icon: calcIcon(v, 'backtop'), 
 |                  }); 
 |              }, 
 |              toTop() { 
 |                  var _a; 
 |                  this.triggerEvent('to-top'); 
 |                  if (this.$parent) { 
 |                      (_a = this.$parent) === null || _a === void 0 ? void 0 : _a.setScrollTop(0); 
 |                      this.setData({ hidden: true }); 
 |                  } 
 |                  else { 
 |                      wx.pageScrollTo({ 
 |                          scrollTop: 0, 
 |                          duration: 300, 
 |                      }); 
 |                  } 
 |              }, 
 |          }; 
 |      } 
 |  }; 
 |  BackTop = __decorate([ 
 |      wxComponent() 
 |  ], BackTop); 
 |  export default BackTop; 
 |  
  |