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, ScreenService } 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 screenService: ScreenService,
  44     private markdownService: MarkdownService
  45   ) { }
  46
  47   ngOnInit () {
  48     this.contentChanged
  49         .pipe(
  50           debounceTime(150),
  51           distinctUntilChanged()
  52         )
  53         .subscribe(() => this.updatePreviews())
  54
  55     this.contentChanged.next(this.content)
  56   }
  57
  58   propagateChange = (_: any) => { /* empty */ }
  59
  60   writeValue (description: string) {
  61     this.content = description
  62
  63     this.contentChanged.next(this.content)
  64   }
  65
  66   registerOnChange (fn: (_: any) => void) {
  67     this.propagateChange = fn
  68   }
  69
  70   registerOnTouched () {
  71     // Unused
  72   }
  73
  74   onModelChange () {
  75     this.propagateChange(this.content)
  76
  77     this.contentChanged.next(this.content)
  78   }
  79
  80   onMaximizeClick () {
  81     this.isMaximized = !this.isMaximized
  82
  83     // Make sure textarea have the focus
  84     // Except on touchscreens devices, the virtual keyboard may move up and hide the textarea in maximized mode
  85     if (!this.screenService.isInTouchScreen()) {
  86       this.textareaElement.nativeElement.focus()
  87     }
  88
  89     // Make sure the window has no scrollbars
  90     if (!this.isMaximized) {
  91       this.unlockBodyScroll()
  92     } else {
  93       this.lockBodyScroll()
  94     }
  95   }
  96
  97   private lockBodyScroll () {
  98     this.scrollPosition = this.viewportScroller.getScrollPosition()
  99     document.getElementById('content').classList.add('lock-scroll')
 100   }
 101
 102   private unlockBodyScroll () {
 103     document.getElementById('content').classList.remove('lock-scroll')
 104     this.viewportScroller.scrollToPosition(this.scrollPosition)
 105   }
 106
 107   private async updatePreviews () {
 108     if (this.content === null || this.content === undefined) return
 109
 110     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
 111     this.previewHTML = await this.markdownRender(this.content)
 112   }
 113
 114   private async markdownRender (text: string) {
 115     const html = this.markdownType === 'text' ?
 116       await this.markdownService.textMarkdownToHTML(text) :
 117       await this.markdownService.enhancedMarkdownToHTML(text)
 118
 119     return this.markdownVideo ? this.markdownService.processVideoTimestamps(html) : html
 120   }
 121 }