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 { ViewportScroller } from '@angular/common'
   5 import { Component, ElementRef, forwardRef, Input, OnInit, ViewChild } from '@angular/core'
   6 import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms'
   7 import { SafeHtml } from '@angular/platform-browser'
   8 import { MarkdownService, ScreenService } from '@app/core'
   9 import { Video } from '@shared/models'
  10
  11 @Component({
  12   selector: 'my-markdown-textarea',
  13   templateUrl: './markdown-textarea.component.html',
  14   styleUrls: [ './markdown-textarea.component.scss' ],
  15   providers: [
  16     {
  17       provide: NG_VALUE_ACCESSOR,
  18       useExisting: forwardRef(() => MarkdownTextareaComponent),
  19       multi: true
  20     }
  21   ]
  22 })
  23
  24 export class MarkdownTextareaComponent implements ControlValueAccessor, OnInit {
  25   @Input() content = ''
  26
  27   @Input() classes: string[] | { [klass: string]: any[] | any } = []
  28
  29   @Input() textareaMaxWidth = '100%'
  30   @Input() textareaHeight = '150px'
  31
  32   @Input() truncate: number
  33
  34   @Input() markdownType: 'text' | 'enhanced' = 'text'
  35   @Input() customMarkdownRenderer?: (text: string) => Promise<string | HTMLElement>
  36
  37   @Input() markdownVideo: Video
  38
  39   @Input() name = 'description'
  40
  41   @ViewChild('textarea') textareaElement: ElementRef
  42   @ViewChild('previewElement') previewElement: ElementRef
  43
  44   truncatedPreviewHTML: SafeHtml | string = ''
  45   previewHTML: SafeHtml | string = ''
  46
  47   isMaximized = false
  48
  49   maximizeInText = $localize`Maximize editor`
  50   maximizeOutText = $localize`Exit maximized editor`
  51
  52   private contentChanged = new Subject<string>()
  53   private scrollPosition: [number, number]
  54
  55   constructor (
  56     private viewportScroller: ViewportScroller,
  57     private screenService: ScreenService,
  58     private markdownService: MarkdownService
  59   ) { }
  60
  61   ngOnInit () {
  62     this.contentChanged
  63         .pipe(
  64           debounceTime(150),
  65           distinctUntilChanged()
  66         )
  67         .subscribe(() => this.updatePreviews())
  68
  69     this.contentChanged.next(this.content)
  70   }
  71
  72   propagateChange = (_: any) => { /* empty */ }
  73
  74   writeValue (description: string) {
  75     this.content = description
  76
  77     this.contentChanged.next(this.content)
  78   }
  79
  80   registerOnChange (fn: (_: any) => void) {
  81     this.propagateChange = fn
  82   }
  83
  84   registerOnTouched () {
  85     // Unused
  86   }
  87
  88   onModelChange () {
  89     this.propagateChange(this.content)
  90
  91     this.contentChanged.next(this.content)
  92   }
  93
  94   onMaximizeClick () {
  95     this.isMaximized = !this.isMaximized
  96
  97     // Make sure textarea have the focus
  98     // Except on touchscreens devices, the virtual keyboard may move up and hide the textarea in maximized mode
  99     if (!this.screenService.isInTouchScreen()) {
 100       this.textareaElement.nativeElement.focus()
 101     }
 102
 103     // Make sure the window has no scrollbars
 104     if (!this.isMaximized) {
 105       this.unlockBodyScroll()
 106     } else {
 107       this.lockBodyScroll()
 108     }
 109   }
 110
 111   private lockBodyScroll () {
 112     this.scrollPosition = this.viewportScroller.getScrollPosition()
 113     document.getElementById('content').classList.add('lock-scroll')
 114   }
 115
 116   private unlockBodyScroll () {
 117     document.getElementById('content').classList.remove('lock-scroll')
 118     this.viewportScroller.scrollToPosition(this.scrollPosition)
 119   }
 120
 121   private async updatePreviews () {
 122     if (this.content === null || this.content === undefined) return
 123
 124     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
 125     this.previewHTML = await this.markdownRender(this.content)
 126   }
 127
 128   private async markdownRender (text: string) {
 129     let html: string
 130
 131     if (this.customMarkdownRenderer) {
 132       const result = await this.customMarkdownRenderer(text)
 133
 134       if (result instanceof HTMLElement) {
 135         html = ''
 136
 137         const wrapperElement = this.previewElement.nativeElement as HTMLElement
 138         wrapperElement.innerHTML = ''
 139         wrapperElement.appendChild(result)
 140         return
 141       }
 142
 143       html = result
 144     } else if (this.markdownType === 'text') {
 145       html = await this.markdownService.textMarkdownToHTML(text)
 146     } else {
 147       html = await this.markdownService.enhancedMarkdownToHTML(text)
 148     }
 149
 150     if (this.markdownVideo) {
 151       html = this.markdownService.processVideoTimestamps(this.markdownVideo.shortUUID, html)
 152     }
 153
 154     return html
 155   }
 156 }