ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
119 lines • 13.6 kB
JavaScript
/**
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { __decorate, __metadata } from "tslib";
import { Platform } from '@angular/cdk/platform';
import { DOCUMENT } from '@angular/common';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, EventEmitter, Inject, Input, NgZone, Output, TemplateRef, ViewEncapsulation } from '@angular/core';
import { fadeMotion } from 'ng-zorro-antd/core/animation';
import { NzConfigService, WithConfig } from 'ng-zorro-antd/core/config';
import { NzScrollService } from 'ng-zorro-antd/core/services';
import { InputNumber } from 'ng-zorro-antd/core/util';
import { fromEvent, Subject } from 'rxjs';
import { takeUntil, throttleTime } from 'rxjs/operators';
const NZ_CONFIG_MODULE_NAME = 'backTop';
export class NzBackTopComponent {
constructor(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._nzModuleName = NZ_CONFIG_MODULE_NAME;
this.scrollListenerDestroy$ = new Subject();
this.target = null;
this.visible = false;
this.nzVisibilityHeight = 400;
this.nzDuration = 450;
this.nzClick = new EventEmitter();
}
ngOnInit() {
this.registerScrollEvent();
}
clickBackTop() {
this.scrollSrv.scrollTo(this.getTarget(), 0, { duration: this.nzDuration });
this.nzClick.emit(true);
}
getTarget() {
return this.target || window;
}
handleScroll() {
if (this.visible === this.scrollSrv.getScroll(this.getTarget()) > this.nzVisibilityHeight) {
return;
}
this.visible = !this.visible;
this.cd.detectChanges();
}
registerScrollEvent() {
if (!this.platform.isBrowser) {
return;
}
this.scrollListenerDestroy$.next();
this.handleScroll();
this.zone.runOutsideAngular(() => {
fromEvent(this.getTarget(), 'scroll')
.pipe(throttleTime(50), takeUntil(this.scrollListenerDestroy$))
.subscribe(() => this.handleScroll());
});
}
ngOnDestroy() {
this.scrollListenerDestroy$.next();
this.scrollListenerDestroy$.complete();
}
ngOnChanges(changes) {
const { nzTarget } = changes;
if (nzTarget) {
this.target = typeof this.nzTarget === 'string' ? this.doc.querySelector(this.nzTarget) : this.nzTarget;
this.registerScrollEvent();
}
}
}
NzBackTopComponent.decorators = [
{ type: Component, args: [{
selector: 'nz-back-top',
exportAs: 'nzBackTop',
animations: [fadeMotion],
template: `
<div class="ant-back-top" (click)="clickBackTop()" *ngIf="visible">
<ng-template #defaultContent>
<div class="ant-back-top-content">
<div class="ant-back-top-icon">
<i nz-icon nzType="vertical-align-top"></i>
</div>
</div>
</ng-template>
<ng-template [ngTemplateOutlet]="nzTemplate || defaultContent"></ng-template>
</div>
`,
changeDetection: ChangeDetectionStrategy.OnPush,
encapsulation: ViewEncapsulation.None,
preserveWhitespaces: false
},] }
];
NzBackTopComponent.ctorParameters = () => [
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
{ type: NzConfigService },
{ type: NzScrollService },
{ type: Platform },
{ type: ChangeDetectorRef },
{ type: NgZone }
];
NzBackTopComponent.propDecorators = {
nzTemplate: [{ type: Input }],
nzVisibilityHeight: [{ type: Input }],
nzTarget: [{ type: Input }],
nzDuration: [{ type: Input }],
nzClick: [{ type: Output }]
};
__decorate([
WithConfig(),
InputNumber(),
__metadata("design:type", Number)
], NzBackTopComponent.prototype, "nzVisibilityHeight", void 0);
__decorate([
InputNumber(),
__metadata("design:type", Number)
], NzBackTopComponent.prototype, "nzDuration", void 0);
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* Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { Platform } from '@angular/cdk/platform';\nimport { DOCUMENT } from '@angular/common';\nimport {\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  EventEmitter,\n  Inject,\n  Input,\n  NgZone,\n  OnChanges,\n  OnDestroy,\n  OnInit,\n  Output,\n  SimpleChanges,\n  TemplateRef,\n  ViewEncapsulation\n} from '@angular/core';\nimport { fadeMotion } from 'ng-zorro-antd/core/animation';\nimport { NzConfigKey, NzConfigService, WithConfig } from 'ng-zorro-antd/core/config';\nimport { NzScrollService } from 'ng-zorro-antd/core/services';\nimport { NumberInput, NzSafeAny } from 'ng-zorro-antd/core/types';\nimport { InputNumber } from 'ng-zorro-antd/core/util';\n\nimport { fromEvent, Subject } from 'rxjs';\nimport { takeUntil, throttleTime } from 'rxjs/operators';\n\nconst NZ_CONFIG_MODULE_NAME: NzConfigKey = 'backTop';\n\n@Component({\n  selector: 'nz-back-top',\n  exportAs: 'nzBackTop',\n  animations: [fadeMotion],\n  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  `,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  encapsulation: ViewEncapsulation.None,\n  preserveWhitespaces: false\n})\nexport class NzBackTopComponent implements OnInit, OnDestroy, OnChanges {\n  readonly _nzModuleName: NzConfigKey = NZ_CONFIG_MODULE_NAME;\n  static ngAcceptInputType_nzVisibilityHeight: NumberInput;\n  static ngAcceptInputType_nzDuration: NumberInput;\n\n  private scrollListenerDestroy$ = new Subject();\n  private target: HTMLElement | null = null;\n\n  visible: boolean = false;\n\n  @Input() nzTemplate?: TemplateRef<void>;\n  @Input() @WithConfig() @InputNumber() nzVisibilityHeight: number = 400;\n  @Input() nzTarget?: string | HTMLElement;\n  @Input() @InputNumber() nzDuration: number = 450;\n  @Output() readonly nzClick: EventEmitter<boolean> = new EventEmitter();\n\n  constructor(\n    @Inject(DOCUMENT) private doc: NzSafeAny,\n    public nzConfigService: NzConfigService,\n    private scrollSrv: NzScrollService,\n    private platform: Platform,\n    private cd: ChangeDetectorRef,\n    private zone: NgZone\n  ) {}\n\n  ngOnInit(): void {\n    this.registerScrollEvent();\n  }\n\n  clickBackTop(): void {\n    this.scrollSrv.scrollTo(this.getTarget(), 0, { duration: this.nzDuration });\n    this.nzClick.emit(true);\n  }\n\n  private getTarget(): HTMLElement | Window {\n    return this.target || window;\n  }\n\n  private handleScroll(): void {\n    if (this.visible === this.scrollSrv.getScroll(this.getTarget()) > this.nzVisibilityHeight) {\n      return;\n    }\n    this.visible = !this.visible;\n    this.cd.detectChanges();\n  }\n\n  private registerScrollEvent(): void {\n    if (!this.platform.isBrowser) {\n      return;\n    }\n    this.scrollListenerDestroy$.next();\n    this.handleScroll();\n    this.zone.runOutsideAngular(() => {\n      fromEvent(this.getTarget(), 'scroll')\n        .pipe(throttleTime(50), takeUntil(this.scrollListenerDestroy$))\n        .subscribe(() => this.handleScroll());\n    });\n  }\n\n  ngOnDestroy(): void {\n    this.scrollListenerDestroy$.next();\n    this.scrollListenerDestroy$.complete();\n  }\n\n  ngOnChanges(changes: SimpleChanges): void {\n    const { nzTarget } = changes;\n    if (nzTarget) {\n      this.target = typeof this.nzTarget === 'string' ? this.doc.querySelector(this.nzTarget) : this.nzTarget;\n      this.registerScrollEvent();\n    }\n  }\n}\n"]}