整理した

src/client/app/common/views/directives/autocomplete.ts

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+import * as getCaretCoordinates from 'textarea-caret';
+import MkAutocomplete from '../components/autocomplete.vue';
+
+export default {
+	bind(el, binding, vn) {
+		const self = el._autoCompleteDirective_ = {} as any;
+		self.x = new Autocomplete(el, vn.context, binding.value);
+		self.x.attach();
+	},
+
+	unbind(el, binding, vn) {
+		const self = el._autoCompleteDirective_;
+		self.x.detach();
+	}
+};
+
+/**
+ * オートコンプリートを管理するクラス。
+ */
+class Autocomplete {
+	private suggestion: any;
+	private textarea: any;
+	private vm: any;
+	private model: any;
+	private currentType: string;
+
+	private get text(): string {
+		return this.vm[this.model];
+	}
+
+	private set text(text: string) {
+		this.vm[this.model] = text;
+	}
+
+	/**
+	 * 対象のテキストエリアを与えてインスタンスを初期化します。
+	 */
+	constructor(textarea, vm, model) {
+		//#region BIND
+		this.onInput = this.onInput.bind(this);
+		this.complete = this.complete.bind(this);
+		this.close = this.close.bind(this);
+		//#endregion
+
+		this.suggestion = null;
+		this.textarea = textarea;
+		this.vm = vm;
+		this.model = model;
+	}
+
+	/**
+	 * このインスタンスにあるテキストエリアの入力のキャプチャを開始します。
+	 */
+	public attach() {
+		this.textarea.addEventListener('input', this.onInput);
+	}
+
+	/**
+	 * このインスタンスにあるテキストエリアの入力のキャプチャを解除します。
+	 */
+	public detach() {
+		this.textarea.removeEventListener('input', this.onInput);
+		this.close();
+	}
+
+	/**
+	 * テキスト入力時
+	 */
+	private onInput() {
+		const caret = this.textarea.selectionStart;
+		const text = this.text.substr(0, caret);
+
+		const mentionIndex = text.lastIndexOf('@');
+		const emojiIndex = text.lastIndexOf(':');
+
+		let opened = false;
+
+		if (mentionIndex != -1 && mentionIndex > emojiIndex) {
+			const username = text.substr(mentionIndex + 1);
+			if (username != '' && username.match(/^[a-zA-Z0-9_]+$/)) {
+				this.open('user', username);
+				opened = true;
+			}
+		}
+
+		if (emojiIndex != -1 && emojiIndex > mentionIndex) {
+			const emoji = text.substr(emojiIndex + 1);
+			if (emoji != '' && emoji.match(/^[\+\-a-z0-9_]+$/)) {
+				this.open('emoji', emoji);
+				opened = true;
+			}
+		}
+
+		if (!opened) {
+			this.close();
+		}
+	}
+
+	/**
+	 * サジェストを提示します。
+	 */
+	private open(type, q) {
+		if (type != this.currentType) {
+			this.close();
+		}
+		this.currentType = type;
+
+		//#region サジェストを表示すべき位置を計算
+		const caretPosition = getCaretCoordinates(this.textarea, this.textarea.selectionStart);
+
+		const rect = this.textarea.getBoundingClientRect();
+
+		const x = rect.left + caretPosition.left - this.textarea.scrollLeft;
+		const y = rect.top + caretPosition.top - this.textarea.scrollTop;
+		//#endregion
+
+		if (this.suggestion) {
+			this.suggestion.x = x;
+			this.suggestion.y = y;
+			this.suggestion.q = q;
+		} else {
+			// サジェスト要素作成
+			this.suggestion = new MkAutocomplete({
+				propsData: {
+					textarea: this.textarea,
+					complete: this.complete,
+					close: this.close,
+					type: type,
+					q: q,
+					x,
+					y
+				}
+			}).$mount();
+
+			// 要素追加
+			document.body.appendChild(this.suggestion.$el);
+		}
+	}
+
+	/**
+	 * サジェストを閉じます。
+	 */
+	private close() {
+		if (this.suggestion == null) return;
+
+		this.suggestion.$destroy();
+		this.suggestion = null;
+
+		this.textarea.focus();
+	}
+
+	/**
+	 * オートコンプリートする
+	 */
+	private complete(type, value) {
+		this.close();
+
+		const caret = this.textarea.selectionStart;
+
+		if (type == 'user') {
+			const source = this.text;
+
+			const before = source.substr(0, caret);
+			const trimmedBefore = before.substring(0, before.lastIndexOf('@'));
+			const after = source.substr(caret);
+
+			// 挿入
+			this.text = trimmedBefore + '@' + value.username + ' ' + after;
+
+			// キャレットを戻す
+			this.vm.$nextTick(() => {
+				this.textarea.focus();
+				const pos = trimmedBefore.length + (value.username.length + 2);
+				this.textarea.setSelectionRange(pos, pos);
+			});
+		} else if (type == 'emoji') {
+			const source = this.text;
+
+			const before = source.substr(0, caret);
+			const trimmedBefore = before.substring(0, before.lastIndexOf(':'));
+			const after = source.substr(caret);
+
+			// 挿入
+			this.text = trimmedBefore + value + after;
+
+			// キャレットを戻す
+			this.vm.$nextTick(() => {
+				this.textarea.focus();
+				const pos = trimmedBefore.length + 1;
+				this.textarea.setSelectionRange(pos, pos);
+			});
+		}
+	}
+}