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

   1 import { ViewportScroller } from '@angular/common'
   2 import truncate from 'lodash-es/truncate'
   3 import { Subject } from 'rxjs'
   4 import { debounceTime, distinctUntilChanged } from 'rxjs/operators'
   5 import { Component, ElementRef, forwardRef, Input, OnInit, ViewChild } from '@angular/core'
   6 import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms'
   7 import { MarkdownService } from '@app/core'
   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   private scrollPosition: [number, number]
  40
  41   constructor (
  42     private viewportScroller: ViewportScroller,
  43     private markdownService: MarkdownService
  44   ) { }
  45
  46   ngOnInit () {
  47     this.contentChanged
  48         .pipe(
  49           debounceTime(150),
  50           distinctUntilChanged()
  51         )
  52         .subscribe(() => this.updatePreviews())
  53
  54     this.contentChanged.next(this.content)
  55   }
  56
  57   propagateChange = (_: any) => { /* empty */ }
  58
  59   writeValue (description: string) {
  60     this.content = description
  61
  62     this.contentChanged.next(this.content)
  63   }
  64
  65   registerOnChange (fn: (_: any) => void) {
  66     this.propagateChange = fn
  67   }
  68
  69   registerOnTouched () {
  70     // Unused
  71   }
  72
  73   onModelChange () {
  74     this.propagateChange(this.content)
  75
  76     this.contentChanged.next(this.content)
  77   }
  78
  79   onMaximizeClick () {
  80     this.isMaximized = !this.isMaximized
  81
  82     // Make sure textarea have the focus
  83     this.textareaElement.nativeElement.focus()
  84
  85     // Make sure the window has no scrollbars
  86     if (!this.isMaximized) {
  87       this.unlockBodyScroll()
  88     } else {
  89       this.lockBodyScroll()
  90     }
  91   }
  92
  93   private lockBodyScroll () {
  94     this.scrollPosition = this.viewportScroller.getScrollPosition()
  95     document.getElementById('content').classList.add('lock-scroll')
  96   }
  97
  98   private unlockBodyScroll () {
  99     document.getElementById('content').classList.remove('lock-scroll')
 100     this.viewportScroller.scrollToPosition(this.scrollPosition)
 101   }
 102
 103   private async updatePreviews () {
 104     if (this.content === null || this.content === undefined) return
 105
 106     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
 107     this.previewHTML = await this.markdownRender(this.content)
 108   }
 109
 110   private async markdownRender (text: string) {
 111     const html = this.markdownType === 'text' ?
 112       await this.markdownService.textMarkdownToHTML(text) :
 113       await this.markdownService.enhancedMarkdownToHTML(text)
 114
 115     return this.markdownVideo ? this.markdownService.processVideoTimestamps(html) : html
 116   }
 117 }