(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/animation'), require('ng-zorro-antd/core/config'), require('ng-zorro-antd/core/services'), require('ng-zorro-antd/core/util'), require('rxjs'), require('rxjs/operators'), require('ng-zorro-antd/icon')) :
    typeof define === 'function' && define.amd ? define('ng-zorro-antd/back-top', ['exports', '@angular/cdk/platform', '@angular/common', '@angular/core', 'ng-zorro-antd/core/animation', 'ng-zorro-antd/core/config', 'ng-zorro-antd/core/services', 'ng-zorro-antd/core/util', 'rxjs', 'rxjs/operators', 'ng-zorro-antd/icon'], 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.animation, global['ng-zorro-antd'].core.config, global['ng-zorro-antd'].core.services, global['ng-zorro-antd'].core.util, global.rxjs, global.rxjs.operators, global['ng-zorro-antd'].icon));
}(this, (function (exports, platform, common, core, animation, config, services, util, rxjs, operators, icon) { 'use strict';

    /*! *****************************************************************************
    Copyright (c) Microsoft Corporation.

    Permission to use, copy, modify, and/or distribute this software for any
    purpose with or without fee is hereby granted.

    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
    REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
    AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
    INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
    LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
    OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
    PERFORMANCE OF THIS SOFTWARE.
    ***************************************************************************** */
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    /**
     * @fileoverview added by tsickle
     * Generated from: 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 () {
        /**
         * @param {?} doc
         * @param {?} nzConfigService
         * @param {?} scrollSrv
         * @param {?} platform
         * @param {?} cd
         * @param {?} zone
         */
        function NzBackTopComponent(doc, nzConfigService, scrollSrv, platform, cd, zone) {
            this.doc = doc;
            this.nzConfigService = nzConfigService;
            this.scrollSrv = scrollSrv;
            this.platform = platform;
            this.cd = cd;
            this.zone = zone;
            this.scrollListenerDestroy$ = new rxjs.Subject();
            this.target = null;
            this.visible = false;
            this.nzVisibilityHeight = 400;
            this.nzClick = new core.EventEmitter();
        }
        /**
         * @return {?}
         */
        NzBackTopComponent.prototype.ngOnInit = function () {
            this.registerScrollEvent();
        };
        /**
         * @return {?}
         */
        NzBackTopComponent.prototype.clickBackTop = function () {
            this.scrollSrv.scrollTo(this.getTarget(), 0);
            this.nzClick.emit(true);
        };
        /**
         * @private
         * @return {?}
         */
        NzBackTopComponent.prototype.getTarget = function () {
            return this.target || window;
        };
        /**
         * @private
         * @return {?}
         */
        NzBackTopComponent.prototype.handleScroll = function () {
            if (this.visible === this.scrollSrv.getScroll(this.getTarget()) > this.nzVisibilityHeight) {
                return;
            }
            this.visible = !this.visible;
            this.cd.detectChanges();
        };
        /**
         * @private
         * @return {?}
         */
        NzBackTopComponent.prototype.registerScrollEvent = function () {
            var _this = this;
            if (!this.platform.isBrowser) {
                return;
            }
            this.scrollListenerDestroy$.next();
            this.handleScroll();
            this.zone.runOutsideAngular(( /**
             * @return {?}
             */function () {
                rxjs.fromEvent(_this.getTarget(), 'scroll')
                    .pipe(operators.throttleTime(50), operators.takeUntil(_this.scrollListenerDestroy$))
                    .subscribe(( /**
             * @return {?}
             */function () { return _this.handleScroll(); }));
            }));
        };
        /**
         * @return {?}
         */
        NzBackTopComponent.prototype.ngOnDestroy = function () {
            this.scrollListenerDestroy$.next();
            this.scrollListenerDestroy$.complete();
        };
        /**
         * @param {?} changes
         * @return {?}
         */
        NzBackTopComponent.prototype.ngOnChanges = function (changes) {
            var nzTarget = changes.nzTarget;
            if (nzTarget) {
                this.target = typeof this.nzTarget === 'string' ? this.doc.querySelector(this.nzTarget) : this.nzTarget;
                this.registerScrollEvent();
            }
        };
        return NzBackTopComponent;
    }());
    NzBackTopComponent.decorators = [
        { type: core.Component, args: [{
                    selector: 'nz-back-top',
                    exportAs: 'nzBackTop',
                    animations: [animation.fadeMotion],
                    template: "\n    <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\">\n            <i nz-icon nzType=\"vertical-align-top\"></i>\n          </div>\n        </div>\n      </ng-template>\n      <ng-template [ngTemplateOutlet]=\"nzTemplate || defaultContent\"></ng-template>\n    </div>\n  ",
                    changeDetection: core.ChangeDetectionStrategy.OnPush,
                    encapsulation: core.ViewEncapsulation.None,
                    preserveWhitespaces: false
                }] }
    ];
    /** @nocollapse */
    NzBackTopComponent.ctorParameters = function () { return [
        { type: undefined, decorators: [{ type: core.Inject, args: [common.DOCUMENT,] }] },
        { type: config.NzConfigService },
        { type: services.NzScrollService },
        { type: platform.Platform },
        { type: core.ChangeDetectorRef },
        { type: core.NgZone }
    ]; };
    NzBackTopComponent.propDecorators = {
        nzTemplate: [{ type: core.Input }],
        nzVisibilityHeight: [{ type: core.Input }],
        nzTarget: [{ type: core.Input }],
        nzClick: [{ type: core.Output }]
    };
    __decorate([
        config.WithConfig(NZ_CONFIG_COMPONENT_NAME),
        util.InputNumber(),
        __metadata("design:type", Number)
    ], NzBackTopComponent.prototype, "nzVisibilityHeight", void 0);
    if (false) {
        /** @type {?} */
        NzBackTopComponent.ngAcceptInputType_nzVisibilityHeight;
        /**
         * @type {?}
         * @private
         */
        NzBackTopComponent.prototype.scrollListenerDestroy$;
        /**
         * @type {?}
         * @private
         */
        NzBackTopComponent.prototype.target;
        /** @type {?} */
        NzBackTopComponent.prototype.visible;
        /** @type {?} */
        NzBackTopComponent.prototype.nzTemplate;
        /** @type {?} */
        NzBackTopComponent.prototype.nzVisibilityHeight;
        /** @type {?} */
        NzBackTopComponent.prototype.nzTarget;
        /** @type {?} */
        NzBackTopComponent.prototype.nzClick;
        /**
         * @type {?}
         * @private
         */
        NzBackTopComponent.prototype.doc;
        /** @type {?} */
        NzBackTopComponent.prototype.nzConfigService;
        /**
         * @type {?}
         * @private
         */
        NzBackTopComponent.prototype.scrollSrv;
        /**
         * @type {?}
         * @private
         */
        NzBackTopComponent.prototype.platform;
        /**
         * @type {?}
         * @private
         */
        NzBackTopComponent.prototype.cd;
        /**
         * @type {?}
         * @private
         */
        NzBackTopComponent.prototype.zone;
    }

    /**
     * @fileoverview added by tsickle
     * Generated from: back-top.module.ts
     * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
     */
    var NzBackTopModule = /** @class */ (function () {
        function NzBackTopModule() {
        }
        return NzBackTopModule;
    }());
    NzBackTopModule.decorators = [
        { type: core.NgModule, args: [{
                    declarations: [NzBackTopComponent],
                    exports: [NzBackTopComponent],
                    imports: [common.CommonModule, platform.PlatformModule, icon.NzIconModule]
                },] }
    ];

    /**
     * @fileoverview added by tsickle
     * Generated from: public-api.ts
     * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
     */

    /**
     * @fileoverview added by tsickle
     * Generated from: ng-zorro-antd-back-top.ts
     * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
     */

    exports.NzBackTopComponent = NzBackTopComponent;
    exports.NzBackTopModule = NzBackTopModule;

    Object.defineProperty(exports, '__esModule', { value: true });

})));
//# sourceMappingURL=ng-zorro-antd-back-top.umd.js.map
