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