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   maximizeInText = $localize`Maximize editor`
  39   maximizeOutText = $localize`Exit maximized editor`
  40
  41   private contentChanged = new Subject<string>()
  42   private scrollPosition: [number, number]
  43
  44   constructor (
  45     private viewportScroller: ViewportScroller,
  46     private screenService: ScreenService,
  47     private markdownService: MarkdownService
  48   ) { }
  49
  50   ngOnInit () {
  51     this.contentChanged
  52         .pipe(
  53           debounceTime(150),
  54           distinctUntilChanged()
  55         )
  56         .subscribe(() => this.updatePreviews())
  57
  58     this.contentChanged.next(this.content)
  59   }
  60
  61   propagateChange = (_: any) => { /* empty */ }
  62
  63   writeValue (description: string) {
  64     this.content = description
  65
  66     this.contentChanged.next(this.content)
  67   }
  68
  69   registerOnChange (fn: (_: any) => void) {
  70     this.propagateChange = fn
  71   }
  72
  73   registerOnTouched () {
  74     // Unused
  75   }
  76
  77   onModelChange () {
  78     this.propagateChange(this.content)
  79
  80     this.contentChanged.next(this.content)
  81   }
  82
  83   onMaximizeClick () {
  84     this.isMaximized = !this.isMaximized
  85
  86     // Make sure textarea have the focus
  87     // Except on touchscreens devices, the virtual keyboard may move up and hide the textarea in maximized mode
  88     if (!this.screenService.isInTouchScreen()) {
  89       this.textareaElement.nativeElement.focus()
  90     }
  91
  92     // Make sure the window has no scrollbars
  93     if (!this.isMaximized) {
  94       this.unlockBodyScroll()
  95     } else {
  96       this.lockBodyScroll()
  97     }
  98   }
  99
 100   private lockBodyScroll () {
 101     this.scrollPosition = this.viewportScroller.getScrollPosition()
 102     document.getElementById('content').classList.add('lock-scroll')
 103   }
 104
 105   private unlockBodyScroll () {
 106     document.getElementById('content').classList.remove('lock-scroll')
 107     this.viewportScroller.scrollToPosition(this.scrollPosition)
 108   }
 109
 110   private async updatePreviews () {
 111     if (this.content === null || this.content === undefined) return
 112
 113     this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
 114     this.previewHTML = await this.markdownRender(this.content)
 115   }
 116
 117   private async markdownRender (text: string) {
 118     const html = this.markdownType === 'text' ?
 119       await this.markdownService.textMarkdownToHTML(text) :
 120       await this.markdownService.enhancedMarkdownToHTML(text)
 121
 122     return this.markdownVideo ? this.markdownService.processVideoTimestamps(html) : html
 123   }
 124 }