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