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

   1 import { debounceTime, distinctUntilChanged } from 'rxjs/operators'
   2 import { Component, forwardRef, Input, OnInit, ViewChild, ElementRef } 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() textareaMaxWidth = '100%'
  26   @Input() textareaHeight = '150px'
  27   @Input() truncate: number
  28   @Input() markdownType: 'text' | 'enhanced' = 'text'
  29   @Input() markdownVideo = false
  30   @Input() name = 'description'
  31
  32   @ViewChild('textarea') textareaElement: ElementRef
  33
  34   truncatedPreviewHTML = ''
  35   previewHTML = ''
  36   isMaximized = false
  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
  56   propagateChange = (_: any) => { /* empty */ }
  57
  58   writeValue (description: string) {
  59     this.content = description
  60
  61     this.contentChanged.next(this.content)
  62   }
  63
  64   registerOnChange (fn: (_: any) => void) {
  65     this.propagateChange = fn
  66   }
  67
  68   registerOnTouched () {
  69     // Unused
  70   }
  71
  72   onModelChange () {
  73     this.propagateChange(this.content)
  74
  75     this.contentChanged.next(this.content)
  76   }
  77
  78   onMaximizeClick () {
  79     this.isMaximized = !this.isMaximized
  80
  81     // Make sure textarea have the focus
  82     this.textareaElement.nativeElement.focus()
  83
  84     // Make sure the window has no scrollbars
  85     if (!this.isMaximized) {
  86       this.unlockBodyScroll()
  87     } else {
  88       this.lockBodyScroll()
  89     }
  90   }
  91
  92   private lockBodyScroll () {
  93     document.getElementById('content').classList.add('lock-scroll')
  94   }
  95
  96   private unlockBodyScroll () {
  97     document.getElementById('content').classList.remove('lock-scroll')
  98   }
  99
 100   private async updatePreviews () {
 101     if (this.content === null || this.content === undefined) return
 102
 103     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
 104     this.previewHTML = await this.markdownRender(this.content)
 105   }
 106
 107   private async markdownRender (text: string) {
 108     const html = this.markdownType === 'text' ?
 109       await this.markdownService.textMarkdownToHTML(text) :
 110       await this.markdownService.enhancedMarkdownToHTML(text)
 111
 112     return this.markdownVideo ? this.markdownService.processVideoTimestamps(html) : html
 113   }
 114 }