client/src/app/shared/forms/markdown-textarea.component.ts

   1 import { debounceTime, distinctUntilChanged } from 'rxjs/operators'
   2 import { Component, forwardRef, Input, OnInit } from '@angular/core'
   3 import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms'
   4 import { Subject } from 'rxjs'
   5 import truncate from 'lodash-es/truncate'
   6 import { ScreenService } from '@app/shared/misc/screen.service'
   7 import { MarkdownService } from '@app/shared/renderer'
   8
   9 @Component({
  10   selector: 'my-markdown-textarea',
  11   templateUrl: './markdown-textarea.component.html',
  12   styleUrls: [ './markdown-textarea.component.scss' ],
  13   providers: [
  14     {
  15       provide: NG_VALUE_ACCESSOR,
  16       useExisting: forwardRef(() => MarkdownTextareaComponent),
  17       multi: true
  18     }
  19   ]
  20 })
  21
  22 export class MarkdownTextareaComponent implements ControlValueAccessor, OnInit {
  23   @Input() content = ''
  24   @Input() classes: string[] | { [klass: string]: any[] | any } = []
  25   @Input() textareaWidth = '100%'
  26   @Input() textareaHeight = '150px'
  27   @Input() previewColumn = false
  28   @Input() truncate: number
  29   @Input() markdownType: 'text' | 'enhanced' = 'text'
  30   @Input() markdownVideo = false
  31   @Input() name = 'description'
  32
  33   textareaMarginRight = '0'
  34   flexDirection = 'column'
  35   truncatedPreviewHTML = ''
  36   previewHTML = ''
  37
  38   private contentChanged = new Subject<string>()
  39
  40   constructor (
  41     private screenService: ScreenService,
  42     private markdownService: MarkdownService
  43 ) {}
  44
  45   ngOnInit () {
  46     this.contentChanged
  47         .pipe(
  48           debounceTime(150),
  49           distinctUntilChanged()
  50         )
  51         .subscribe(() => this.updatePreviews())
  52
  53     this.contentChanged.next(this.content)
  54
  55     if (this.previewColumn) {
  56       this.flexDirection = 'row'
  57       this.textareaMarginRight = '15px'
  58     }
  59   }
  60
  61   propagateChange = (_: any) => { /* empty */ }
  62
  63   writeValue (description: string) {
  64     this.content = description
  65
  66     this.contentChanged.next(this.content)
  67   }
  68
  69   registerOnChange (fn: (_: any) => void) {
  70     this.propagateChange = fn
  71   }
  72
  73   registerOnTouched () {
  74     // Unused
  75   }
  76
  77   onModelChange () {
  78     this.propagateChange(this.content)
  79
  80     this.contentChanged.next(this.content)
  81   }
  82
  83   arePreviewsDisplayed () {
  84     return this.screenService.isInSmallView() === false
  85   }
  86
  87   private async updatePreviews () {
  88     if (this.content === null || this.content === undefined) return
  89
  90     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
  91     this.previewHTML = await this.markdownRender(this.content)
  92   }
  93
  94   private async markdownRender (text: string) {
  95     const html = this.markdownType === 'text' ?
  96       await this.markdownService.textMarkdownToHTML(text) :
  97       await this.markdownService.enhancedMarkdownToHTML(text)
  98
  99     return this.markdownVideo ? this.markdownService.processVideoTimestamps(html) : html
 100   }
 101 }