@eternalheart/ngx-file-preview
Version:
A powerful Angular file preview component library supporting multiple file formats including images, videos, PDFs, Office documents, text files and more.
137 lines • 15.3 kB
JavaScript
import { ApplicationRef, createComponent, inject, Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
import { PreviewModalComponent } from '../components';
import { ThemeService } from "./theme.service";
import { I18nUtils } from "../i18n/i18n.utils";
import * as i0 from "@angular/core";
export const INITIAL_PREVIEW_STATE = {
isVisible: false,
currentIndex: 0,
files: []
};
export class PreviewService {
constructor() {
this.appRef = inject(ApplicationRef);
this.lang = 'zh';
this.loading = new BehaviorSubject(false);
// endregion
// region 状态管理
this.stateSubject = new BehaviorSubject(INITIAL_PREVIEW_STATE);
}
/**
* 初始化
* @param injector
* @param envInjector
*/
init(injector, envInjector) {
this.envInjector = envInjector;
this.injector = injector;
}
/**
* 设置语言
* @param lang
*/
setLang(lang) {
this.lang = lang;
}
/**
* 获取实际的lang parser
*/
getLangParser() {
return I18nUtils.get(this.lang);
}
get state() {
return this.stateSubject.getValue();
}
getStateObservable() {
return this.stateSubject.asObservable();
}
previous() {
const state = this.state;
const newIndex = Math.max(0, state.currentIndex - 1);
this.updatePreviewState(true, state.files, newIndex);
}
next() {
const state = this.state;
const newIndex = Math.min(state.files.length - 1, state.currentIndex + 1);
this.updatePreviewState(true, state.files, newIndex);
}
updatePreviewState(isVisible, files, index) {
const currentFile = files[index];
this.stateSubject.next({
isVisible,
currentFile,
currentIndex: index,
files
});
}
/**
* 设置加载中状态
* @param loading
*/
setLoading(loading) {
this.loading.next(loading);
}
getLoadingObservable() {
return this.loading.asObservable();
}
get modalElement() {
return this.modalRef?.location.nativeElement;
}
open(options) {
const { files, index = 0 } = options;
if (this.modalRef) {
this.cleanupModal();
}
try {
this.modalRef = createComponent(PreviewModalComponent, {
environmentInjector: this.envInjector,
elementInjector: this.injector,
});
Object.assign(this.modalRef.instance, options);
this.injector.get(ThemeService).bindElement(this.modalRef.location.nativeElement);
document.body.appendChild(this.modalRef.location.nativeElement);
this.modalRef.changeDetectorRef.detectChanges();
this.updatePreviewState(true, files, index);
this.appRef.attachView(this.modalRef.hostView);
}
catch (error) {
console.error('Error creating preview-list modal:', error);
this.cleanupModal();
}
}
close() {
if (document.fullscreenElement) {
document?.exitFullscreen();
}
this.updatePreviewState(false, [], 0);
this.cleanupModal();
}
cleanupModal() {
if (!this.modalRef)
return;
try {
// 从 DOM 中移除模态框
const element = this.modalRef.location.nativeElement;
if (element.parentNode) {
element.parentNode.removeChild(element);
}
// 从 ApplicationRef 中分离视图
this.appRef.detachView(this.modalRef.hostView);
// 销毁组件
this.modalRef.destroy();
}
catch (error) {
console.error('Error cleaning up modal:', error);
}
finally {
this.modalRef = undefined;
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: PreviewService, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: PreviewService }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.12", ngImport: i0, type: PreviewService, decorators: [{
type: Injectable
}] });
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{\n  ApplicationRef,\n  ComponentRef,\n  createComponent,\n  EnvironmentInjector,\n  inject,\n  Injectable,\n  Injector\n} from '@angular/core';\nimport {PreviewFile, PreviewOptions} from '../types/preview.types';\nimport {BehaviorSubject} from 'rxjs';\nimport {PreviewModalComponent} from '../components';\nimport {ThemeService} from \"./theme.service\";\nimport {I18nUtils} from \"../i18n/i18n.utils\";\n\nexport const INITIAL_PREVIEW_STATE = {\n  isVisible: false,\n  currentIndex: 0,\n  files: []\n}\n\nexport interface PreviewState {\n  isVisible: boolean;\n  currentFile?: PreviewFile;\n  currentIndex: number;\n  files: PreviewFile[];\n}\n\n@Injectable()\nexport class PreviewService {\n  // region 服务管理\n  /**\n   * 初始化 需要将所有service注入到modal\n   */\n  private injector!: Injector;\n  private envInjector!: EnvironmentInjector;\n  private appRef = inject(ApplicationRef)\n  private lang: string = 'zh';\n  private loading: BehaviorSubject<boolean> = new BehaviorSubject(false);\n\n  /**\n   * 初始化\n   * @param injector\n   * @param envInjector\n   */\n  init(injector: Injector, envInjector: EnvironmentInjector) {\n    this.envInjector = envInjector;\n    this.injector = injector;\n  }\n\n  /**\n   * 设置语言\n   * @param lang\n   */\n  setLang(lang: string) {\n    this.lang = lang;\n  }\n\n  /**\n   * 获取实际的lang parser\n   */\n  getLangParser() {\n    return I18nUtils.get(this.lang)\n  }\n\n  // endregion\n  // region 状态管理\n  readonly stateSubject = new BehaviorSubject<PreviewState>(INITIAL_PREVIEW_STATE);\n\n  get state() {\n    return this.stateSubject.getValue();\n  }\n\n  getStateObservable() {\n    return this.stateSubject.asObservable();\n  }\n\n  previous() {\n    const state = this.state;\n    const newIndex = Math.max(0, state.currentIndex - 1);\n    this.updatePreviewState(true, state.files, newIndex);\n  }\n\n  next() {\n    const state = this.state;\n    const newIndex = Math.min(state.files.length - 1, state.currentIndex + 1);\n    this.updatePreviewState(true, state.files, newIndex);\n  }\n\n  private updatePreviewState(isVisible: boolean, files: PreviewFile[], index: number) {\n    const currentFile = files[index];\n    this.stateSubject.next({\n      isVisible,\n      currentFile,\n      currentIndex: index,\n      files\n    });\n  }\n\n  /**\n   * 设置加载中状态\n   * @param loading\n   */\n  setLoading(loading: boolean) {\n    this.loading.next(loading);\n  }\n\n  getLoadingObservable() {\n    return this.loading.asObservable();\n  }\n\n  // endregion\n  // region Modal管理\n  private modalRef?: ComponentRef<PreviewModalComponent>;\n\n  get modalElement() {\n    return this.modalRef?.location.nativeElement\n  }\n\n  open(options: PreviewOptions) {\n    const {files, index = 0} = options;\n    if (this.modalRef) {\n      this.cleanupModal()\n    }\n    try {\n      this.modalRef = createComponent(PreviewModalComponent, {\n        environmentInjector: this.envInjector,\n        elementInjector: this.injector,\n      });\n      Object.assign(this.modalRef.instance, options)\n      this.injector.get(ThemeService).bindElement(this.modalRef.location.nativeElement)\n      document.body.appendChild(this.modalRef.location.nativeElement);\n      this.modalRef.changeDetectorRef.detectChanges();\n      this.updatePreviewState(true, files, index);\n      this.appRef.attachView(this.modalRef.hostView);\n    } catch (error) {\n      console.error('Error creating preview-list modal:', error);\n      this.cleanupModal();\n    }\n  }\n\n  close() {\n    if (document.fullscreenElement) {\n      document?.exitFullscreen();\n    }\n    this.updatePreviewState(false, [], 0);\n    this.cleanupModal();\n  }\n\n  private cleanupModal() {\n    if (!this.modalRef) return;\n    try {\n      // 从 DOM 中移除模态框\n      const element = this.modalRef.location.nativeElement;\n      if (element.parentNode) {\n        element.parentNode.removeChild(element);\n      }\n      // 从 ApplicationRef 中分离视图\n      this.appRef.detachView(this.modalRef.hostView);\n      // 销毁组件\n      this.modalRef.destroy();\n    } catch (error) {\n      console.error('Error cleaning up modal:', error);\n    } finally {\n      this.modalRef = undefined;\n    }\n  }\n\n  // endregion\n\n\n}\n"]}