text: (function (global, factory) {
      typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('@angular/cdk/platform'), require('@angular/common'), require('@angular/core'), require('ng-zorro-antd/core'), require('rxjs'), require('rxjs/operators')) :
      typeof define === 'function' && define.amd ? define('ng-zorro-antd/back-top', ['exports', '@angular/cdk/platform', '@angular/common', '@angular/core', 'ng-zorro-antd/core', 'rxjs', 'rxjs/operators'], factory) :
      (global = global || self, factory((global['ng-zorro-antd'] = global['ng-zorro-antd'] || {}, global['ng-zorro-antd']['back-top'] = {}), global.ng.cdk.platform, global.ng.common, global.ng.core, global['ng-zorro-antd'].core, global.rxjs, global.rxjs.operators));
  }(this, (function (exports, platform, common, core, core$1, rxjs, operators) { 'use strict';
  
      /*! *****************************************************************************
      Copyright (c) Microsoft Corporation. All rights reserved.
      Licensed under the Apache License, Version 2.0 (the "License"); you may not use
      this file except in compliance with the License. You may obtain a copy of the
      License at http://www.apache.org/licenses/LICENSE-2.0
  
      THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
      KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
      WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
      MERCHANTABLITY OR NON-INFRINGEMENT.
  
      See the Apache Version 2.0 License for specific language governing permissions
      and limitations under the License.
      ***************************************************************************** */
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      /**
       * @fileoverview added by tsickle
       * Generated from: nz-back-top.component.ts
       * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
       */
      /** @type {?} */
      var NZ_CONFIG_COMPONENT_NAME = 'backTop';
      var NzBackTopComponent = /** @class */ (function () {
          function NzBackTopComponent(nzConfigService, scrollSrv, doc, platform, cd) {
              this.nzConfigService = nzConfigService;
              this.scrollSrv = scrollSrv;
              this.doc = doc;
              this.platform = platform;
              this.cd = cd;
              this.scroll$ = null;
              this.target = null;
              this.visible = false;
              this.nzClick = new core.EventEmitter();
          }
          Object.defineProperty(NzBackTopComponent.prototype, "nzTarget", {
              set: /**
               * @param {?} el
               * @return {?}
               */
              function (el) {
                  this.target = typeof el === 'string' ? this.doc.querySelector(el) : el;
                  this.registerScrollEvent();
              },
              enumerable: true,
              configurable: true
          });
          /**
           * @return {?}
           */
          NzBackTopComponent.prototype.ngOnInit = /**
           * @return {?}
           */
          function () {
              if (!this.scroll$) {
                  this.registerScrollEvent();
              }
          };
          /**
           * @return {?}
           */
          NzBackTopComponent.prototype.clickBackTop = /**
           * @return {?}
           */
          function () {
              this.scrollSrv.scrollTo(this.getTarget(), 0);
              this.nzClick.emit(true);
          };
          /**
           * @private
           * @return {?}
           */
          NzBackTopComponent.prototype.getTarget = /**
           * @private
           * @return {?}
           */
          function () {
              return this.target || window;
          };
          /**
           * @private
           * @return {?}
           */
          NzBackTopComponent.prototype.handleScroll = /**
           * @private
           * @return {?}
           */
          function () {
              if (this.visible === this.scrollSrv.getScroll(this.getTarget()) > this.nzVisibilityHeight) {
                  return;
              }
              this.visible = !this.visible;
              this.cd.markForCheck();
          };
          /**
           * @private
           * @return {?}
           */
          NzBackTopComponent.prototype.removeListen = /**
           * @private
           * @return {?}
           */
          function () {
              if (this.scroll$) {
                  this.scroll$.unsubscribe();
              }
          };
          /**
           * @private
           * @return {?}
           */
          NzBackTopComponent.prototype.registerScrollEvent = /**
           * @private
           * @return {?}
           */
          function () {
              var _this = this;
              if (!this.platform.isBrowser) {
                  return;
              }
              this.removeListen();
              this.handleScroll();
              this.scroll$ = rxjs.fromEvent(this.getTarget(), 'scroll')
                  .pipe(operators.throttleTime(50), operators.distinctUntilChanged())
                  .subscribe((/**
               * @return {?}
               */
              function () { return _this.handleScroll(); }));
          };
          /**
           * @return {?}
           */
          NzBackTopComponent.prototype.ngOnDestroy = /**
           * @return {?}
           */
          function () {
              this.removeListen();
          };
          NzBackTopComponent.decorators = [
              { type: core.Component, args: [{
                          selector: 'nz-back-top',
                          exportAs: 'nzBackTop',
                          animations: [core$1.fadeMotion],
                          template: "<div class=\"ant-back-top\" (click)=\"clickBackTop()\" @fadeMotion *ngIf=\"visible\">\n  <ng-template #defaultContent>\n    <div class=\"ant-back-top-content\">\n      <div class=\"ant-back-top-icon\"></div>\n    </div>\n  </ng-template>\n  <ng-template [ngTemplateOutlet]=\"nzTemplate || defaultContent\"></ng-template>\n</div>",
                          changeDetection: core.ChangeDetectionStrategy.OnPush,
                          encapsulation: core.ViewEncapsulation.None,
                          preserveWhitespaces: false
                      }] }
          ];
          /** @nocollapse */
          NzBackTopComponent.ctorParameters = function () { return [
              { type: core$1.NzConfigService },
              { type: core$1.NzScrollService },
              { type: undefined, decorators: [{ type: core.Inject, args: [common.DOCUMENT,] }] },
              { type: platform.Platform },
              { type: core.ChangeDetectorRef }
          ]; };
          NzBackTopComponent.propDecorators = {
              nzTemplate: [{ type: core.Input }],
              nzVisibilityHeight: [{ type: core.Input }],
              nzTarget: [{ type: core.Input }],
              nzClick: [{ type: core.Output }]
          };
          __decorate([
              core$1.WithConfig(NZ_CONFIG_COMPONENT_NAME, 400), core$1.InputNumber(),
              __metadata("design:type", Number)
          ], NzBackTopComponent.prototype, "nzVisibilityHeight", void 0);
          return NzBackTopComponent;
      }());
      if (false) {
          /**
           * @type {?}
           * @private
           */
          NzBackTopComponent.prototype.scroll$;
          /**
           * @type {?}
           * @private
           */
          NzBackTopComponent.prototype.target;
          /** @type {?} */
          NzBackTopComponent.prototype.visible;
          /** @type {?} */
          NzBackTopComponent.prototype.nzTemplate;
          /** @type {?} */
          NzBackTopComponent.prototype.nzVisibilityHeight;
          /** @type {?} */
          NzBackTopComponent.prototype.nzClick;
          /** @type {?} */
          NzBackTopComponent.prototype.nzConfigService;
          /**
           * @type {?}
           * @private
           */
          NzBackTopComponent.prototype.scrollSrv;
          /**
           * @type {?}
           * @private
           */
          NzBackTopComponent.prototype.doc;
          /**
           * @type {?}
           * @private
           */
          NzBackTopComponent.prototype.platform;
          /**
           * @type {?}
           * @private
           */
          NzBackTopComponent.prototype.cd;
      }
  
      /**
       * @fileoverview added by tsickle
       * Generated from: nz-back-top.module.ts
       * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
       */
      var NzBackTopModule = /** @class */ (function () {
          function NzBackTopModule() {
          }
          NzBackTopModule.decorators = [
              { type: core.NgModule, args: [{
                          declarations: [NzBackTopComponent],
                          exports: [NzBackTopComponent],
                          imports: [common.CommonModule, platform.PlatformModule],
                          providers: [core$1.SCROLL_SERVICE_PROVIDER]
                      },] }
          ];
          return NzBackTopModule;
      }());
  
      exports.NzBackTopComponent = NzBackTopComponent;
      exports.NzBackTopModule = NzBackTopModule;
  
      Object.defineProperty(exports, '__esModule', { value: true });
  
  })));
  //# sourceMappingURL=ng-zorro-antd-back-top.umd.js.map
  