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() formError: string
  28
  29   @Input() truncate: number
  30
  31   @Input() markdownType: 'text' | 'enhanced' = 'text'
  32   @Input() customMarkdownRenderer?: (text: string) => Promise<string | HTMLElement>
  33
  34   @Input() markdownVideo: Video
  35
  36   @Input() name = 'description'
  37
  38   @ViewChild('textarea') textareaElement: ElementRef
  39   @ViewChild('previewElement') previewElement: ElementRef
  40
  41   truncatedPreviewHTML: SafeHtml | string = ''
  42   previewHTML: SafeHtml | string = ''
  43
  44   isMaximized = false
  45   disabled = false
  46
  47   maximizeInText = $localize`Maximize editor`
  48   maximizeOutText = $localize`Exit maximized editor`
  49
  50   private contentChanged = new Subject<string>()
  51   private scrollPosition: [number, number]
  52
  53   constructor (
  54     private viewportScroller: ViewportScroller,
  55     private screenService: ScreenService,
  56     private markdownService: MarkdownService
  57   ) { }
  58
  59   ngOnInit () {
  60     this.contentChanged
  61         .pipe(
  62           debounceTime(150),
  63           distinctUntilChanged()
  64         )
  65         .subscribe(() => this.updatePreviews())
  66
  67     this.contentChanged.next(this.content)
  68   }
  69
  70   propagateChange = (_: any) => { /* empty */ }
  71
  72   writeValue (description: string) {
  73     this.content = description
  74
  75     this.contentChanged.next(this.content)
  76   }
  77
  78   registerOnChange (fn: (_: any) => void) {
  79     this.propagateChange = fn
  80   }
  81
  82   registerOnTouched () {
  83     // Unused
  84   }
  85
  86   onModelChange () {
  87     this.propagateChange(this.content)
  88
  89     this.contentChanged.next(this.content)
  90   }
  91
  92   onMaximizeClick () {
  93     if (this.disabled) return
  94
  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   setDisabledState (isDisabled: boolean) {
 112     this.disabled = isDisabled
 113   }
 114
 115   private lockBodyScroll () {
 116     this.scrollPosition = this.viewportScroller.getScrollPosition()
 117     document.getElementById('content').classList.add('lock-scroll')
 118   }
 119
 120   private unlockBodyScroll () {
 121     document.getElementById('content').classList.remove('lock-scroll')
 122     this.viewportScroller.scrollToPosition(this.scrollPosition)
 123   }
 124
 125   private async updatePreviews () {
 126     if (this.content === null || this.content === undefined) return
 127
 128     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
 129     this.previewHTML = await this.markdownRender(this.content)
 130   }
 131
 132   private async markdownRender (text: string) {
 133     let html: string
 134
 135     if (this.customMarkdownRenderer) {
 136       const result = await this.customMarkdownRenderer(text)
 137
 138       if (result instanceof HTMLElement) {
 139         const wrapperElement = this.previewElement.nativeElement as HTMLElement
 140         wrapperElement.innerHTML = ''
 141         wrapperElement.appendChild(result)
 142         return
 143       }
 144
 145       html = result
 146     } else if (this.markdownType === 'text') {
 147       html = await this.markdownService.textMarkdownToHTML({ markdown: text })
 148     } else {
 149       html = await this.markdownService.enhancedMarkdownToHTML({ markdown: text })
 150     }
 151
 152     if (this.markdownVideo) {
 153       html = this.markdownService.processVideoTimestamps(this.markdownVideo.shortUUID, html)
 154     }
 155
 156     return html
 157   }
 158 }