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import truncate from 'lodash-es/truncate'
import { Subject } from 'rxjs'
import { debounceTime, distinctUntilChanged } from 'rxjs/operators'
import { ViewportScroller } from '@angular/common'
import { Component, ElementRef, forwardRef, Input, OnInit, ViewChild } from '@angular/core'
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms'
import { SafeHtml } from '@angular/platform-browser'
import { MarkdownService, ScreenService } from '@app/core'
import { Video } from '@shared/models'
@Component({
selector: 'my-markdown-textarea',
templateUrl: './markdown-textarea.component.html',
styleUrls: [ './markdown-textarea.component.scss' ],
providers: [
{
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => MarkdownTextareaComponent),
multi: true
}
]
})
export class MarkdownTextareaComponent implements ControlValueAccessor, OnInit {
@Input() content = ''
@Input() formError: string
@Input() truncate: number
@Input() markdownType: 'text' | 'enhanced' = 'text'
@Input() customMarkdownRenderer?: (text: string) => Promise<string | HTMLElement>
@Input() markdownVideo: Video
@Input() name = 'description'
@ViewChild('textarea') textareaElement: ElementRef
@ViewChild('previewElement') previewElement: ElementRef
truncatedPreviewHTML: SafeHtml | string = ''
previewHTML: SafeHtml | string = ''
isMaximized = false
disabled = false
maximizeInText = $localize`Maximize editor`
maximizeOutText = $localize`Exit maximized editor`
private contentChanged = new Subject<string>()
private scrollPosition: [number, number]
constructor (
private viewportScroller: ViewportScroller,
private screenService: ScreenService,
private markdownService: MarkdownService
) { }
ngOnInit () {
this.contentChanged
.pipe(
debounceTime(150),
distinctUntilChanged()
)
.subscribe(() => this.updatePreviews())
this.contentChanged.next(this.content)
}
propagateChange = (_: any) => { /* empty */ }
writeValue (description: string) {
this.content = description
this.contentChanged.next(this.content)
}
registerOnChange (fn: (_: any) => void) {
this.propagateChange = fn
}
registerOnTouched () {
// Unused
}
onModelChange () {
this.propagateChange(this.content)
this.contentChanged.next(this.content)
}
onMaximizeClick () {
if (this.disabled) return
this.isMaximized = !this.isMaximized
// Make sure textarea have the focus
// Except on touchscreens devices, the virtual keyboard may move up and hide the textarea in maximized mode
if (!this.screenService.isInTouchScreen()) {
this.textareaElement.nativeElement.focus()
}
// Make sure the window has no scrollbars
if (!this.isMaximized) {
this.unlockBodyScroll()
} else {
this.lockBodyScroll()
}
}
setDisabledState (isDisabled: boolean) {
this.disabled = isDisabled
}
private lockBodyScroll () {
this.scrollPosition = this.viewportScroller.getScrollPosition()
document.getElementById('content').classList.add('lock-scroll')
}
private unlockBodyScroll () {
document.getElementById('content').classList.remove('lock-scroll')
this.viewportScroller.scrollToPosition(this.scrollPosition)
}
private async updatePreviews () {
if (this.content === null || this.content === undefined) return
this.truncatedPreviewHTML = await this.markdownRender(truncate(this.content, { length: this.truncate }))
this.previewHTML = await this.markdownRender(this.content)
}
private async markdownRender (text: string) {
let html: string
if (this.customMarkdownRenderer) {
const result = await this.customMarkdownRenderer(text)
if (result instanceof HTMLElement) {
const wrapperElement = this.previewElement.nativeElement as HTMLElement
wrapperElement.innerHTML = ''
wrapperElement.appendChild(result)
return
}
html = result
} else if (this.markdownType === 'text') {
html = await this.markdownService.textMarkdownToHTML({ markdown: text })
} else {
html = await this.markdownService.enhancedMarkdownToHTML({ markdown: text })
}
if (this.markdownVideo) {
html = this.markdownService.processVideoTimestamps(this.markdownVideo.shortUUID, html)
}
return html
}
}
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