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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(text) | |
148 | } else { | |
149 | html = await this.markdownService.enhancedMarkdownToHTML(text) | |
150 | } | |
151 | ||
152 | if (this.markdownVideo) { | |
153 | html = this.markdownService.processVideoTimestamps(this.markdownVideo.shortUUID, html) | |
154 | } | |
155 | ||
156 | return html | |
157 | } | |
158 | } |