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

   1 import truncate from 'lodash-es/truncate'
   2 import { Subject } from 'rxjs'
   3 import { debounceTime, distinctUntilChanged } from 'rxjs/operators'
   4 import { Component, ElementRef, forwardRef, Input, OnInit, ViewChild } from '@angular/core'
   5 import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms'
   6 import { MarkdownService } from '@app/core'
   7
   8 @Component({
   9   selector: 'my-markdown-textarea',
  10   templateUrl: './markdown-textarea.component.html',
  11   styleUrls: [ './markdown-textarea.component.scss' ],
  12   providers: [
  13     {
  14       provide: NG_VALUE_ACCESSOR,
  15       useExisting: forwardRef(() => MarkdownTextareaComponent),
  16       multi: true
  17     }
  18   ]
  19 })
  20
  21 export class MarkdownTextareaComponent implements ControlValueAccessor, OnInit {
  22   @Input() content = ''
  23   @Input() classes: string[] | { [klass: string]: any[] | any } = []
  24   @Input() textareaMaxWidth = '100%'
  25   @Input() textareaHeight = '150px'
  26   @Input() truncate: number
  27   @Input() markdownType: 'text' | 'enhanced' = 'text'
  28   @Input() markdownVideo = false
  29   @Input() name = 'description'
  30
  31   @ViewChild('textarea') textareaElement: ElementRef
  32
  33   truncatedPreviewHTML = ''
  34   previewHTML = ''
  35   isMaximized = false
  36
  37   private contentChanged = new Subject<string>()
  38
  39   constructor (private markdownService: MarkdownService) {}
  40
  41   ngOnInit () {
  42     this.contentChanged
  43         .pipe(
  44           debounceTime(150),
  45           distinctUntilChanged()
  46         )
  47         .subscribe(() => this.updatePreviews())
  48
  49     this.contentChanged.next(this.content)
  50   }
  51
  52   propagateChange = (_: any) => { /* empty */ }
  53
  54   writeValue (description: string) {
  55     this.content = description
  56
  57     this.contentChanged.next(this.content)
  58   }
  59
  60   registerOnChange (fn: (_: any) => void) {
  61     this.propagateChange = fn
  62   }
  63
  64   registerOnTouched () {
  65     // Unused
  66   }
  67
  68   onModelChange () {
  69     this.propagateChange(this.content)
  70
  71     this.contentChanged.next(this.content)
  72   }
  73
  74   onMaximizeClick () {
  75     this.isMaximized = !this.isMaximized
  76
  77     // Make sure textarea have the focus
  78     this.textareaElement.nativeElement.focus()
  79
  80     // Make sure the window has no scrollbars
  81     if (!this.isMaximized) {
  82       this.unlockBodyScroll()
  83     } else {
  84       this.lockBodyScroll()
  85     }
  86   }
  87
  88   private lockBodyScroll () {
  89     document.getElementById('content').classList.add('lock-scroll')
  90   }
  91
  92   private unlockBodyScroll () {
  93     document.getElementById('content').classList.remove('lock-scroll')
  94   }
  95
  96   private async updatePreviews () {
  97     if (this.content === null || this.content === undefined) return
  98
  99     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
 100     this.previewHTML = await this.markdownRender(this.content)
 101   }
 102
 103   private async markdownRender (text: string) {
 104     const html = this.markdownType === 'text' ?
 105       await this.markdownService.textMarkdownToHTML(text) :
 106       await this.markdownService.enhancedMarkdownToHTML(text)
 107
 108     return this.markdownVideo ? this.markdownService.processVideoTimestamps(html) : html
 109   }
 110 }