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[] = []
  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
  32   textareaMarginRight = '0'
  33   flexDirection = 'column'
  34   truncatedPreviewHTML = ''
  35   previewHTML = ''
  36
  37   private contentChanged = new Subject<string>()
  38
  39   constructor (
  40     private screenService: ScreenService,
  41     private markdownService: MarkdownService
  42 ) {}
  43
  44   ngOnInit () {
  45     this.contentChanged
  46         .pipe(
  47           debounceTime(150),
  48           distinctUntilChanged()
  49         )
  50         .subscribe(() => this.updatePreviews())
  51
  52     this.contentChanged.next(this.content)
  53
  54     if (this.previewColumn) {
  55       this.flexDirection = 'row'
  56       this.textareaMarginRight = '15px'
  57     }
  58   }
  59
  60   propagateChange = (_: any) => { /* empty */ }
  61
  62   writeValue (description: string) {
  63     this.content = description
  64
  65     this.contentChanged.next(this.content)
  66   }
  67
  68   registerOnChange (fn: (_: any) => void) {
  69     this.propagateChange = fn
  70   }
  71
  72   registerOnTouched () {
  73     // Unused
  74   }
  75
  76   onModelChange () {
  77     this.propagateChange(this.content)
  78
  79     this.contentChanged.next(this.content)
  80   }
  81
  82   arePreviewsDisplayed () {
  83     return this.screenService.isInSmallView() === false
  84   }
  85
  86   private async updatePreviews () {
  87     if (this.content === null || this.content === undefined) return
  88
  89     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
  90     this.previewHTML = await this.markdownRender(this.content)
  91   }
  92
  93   private async markdownRender (text: string) {
  94     const html = this.markdownType === 'text' ?
  95       await this.markdownService.textMarkdownToHTML(text) :
  96       await this.markdownService.enhancedMarkdownToHTML(text)
  97
  98     return this.markdownVideo ? this.markdownService.processVideoTimestamps(html) : html
  99   }
 100 }