2017-11-13 09:05:35 +00:00
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import getCaretCoordinates = require('textarea-caret');
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2017-03-18 11:05:11 +00:00
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import * as riot from 'riot';
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2017-02-18 08:18:31 +00:00
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/**
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* オートコンプリートを管理するクラス。
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*/
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class Autocomplete {
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2017-11-13 09:05:35 +00:00
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private suggestion: any;
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private textarea: any;
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2017-02-18 08:18:31 +00:00
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/**
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* 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。
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*/
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constructor(textarea) {
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2017-02-18 23:09:55 +00:00
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// BIND ---------------------------------
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this.onInput = this.onInput.bind(this);
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this.complete = this.complete.bind(this);
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this.close = this.close.bind(this);
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// --------------------------------------
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2017-02-18 08:18:31 +00:00
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this.suggestion = null;
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this.textarea = textarea;
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}
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/**
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* 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。
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*/
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2017-11-13 09:05:35 +00:00
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public attach() {
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2017-02-18 08:18:31 +00:00
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this.textarea.addEventListener('input', this.onInput);
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}
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/**
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* 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。
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*/
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2017-11-13 09:05:35 +00:00
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public detach() {
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2017-02-18 08:18:31 +00:00
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this.textarea.removeEventListener('input', this.onInput);
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this.close();
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}
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/**
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2017-11-13 09:05:35 +00:00
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* テキスト入力時
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2017-02-18 08:18:31 +00:00
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*/
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2017-11-13 09:05:35 +00:00
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private onInput() {
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2017-02-18 08:18:31 +00:00
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this.close();
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const caret = this.textarea.selectionStart;
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const text = this.textarea.value.substr(0, caret);
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const mentionIndex = text.lastIndexOf('@');
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if (mentionIndex == -1) return;
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const username = text.substr(mentionIndex + 1);
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if (!username.match(/^[a-zA-Z0-9-]+$/)) return;
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this.open('user', username);
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}
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/**
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2017-11-13 09:05:35 +00:00
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* サジェストを提示します。
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2017-02-18 08:18:31 +00:00
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*/
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2017-11-13 09:05:35 +00:00
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private open(type, q) {
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2017-02-18 08:18:31 +00:00
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// 既に開いているサジェストは閉じる
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this.close();
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// サジェスト要素作成
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2017-02-18 22:52:06 +00:00
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const tag = document.createElement('mk-autocomplete-suggestion');
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2017-02-18 08:18:31 +00:00
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// ~ サジェストを表示すべき位置を計算 ~
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const caretPosition = getCaretCoordinates(this.textarea, this.textarea.selectionStart);
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const rect = this.textarea.getBoundingClientRect();
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const x = rect.left + window.pageXOffset + caretPosition.left;
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const y = rect.top + window.pageYOffset + caretPosition.top;
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2017-02-18 22:52:06 +00:00
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tag.style.left = x + 'px';
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tag.style.top = y + 'px';
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2017-02-18 08:18:31 +00:00
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// 要素追加
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2017-02-18 22:52:06 +00:00
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const el = document.body.appendChild(tag);
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2017-02-18 08:18:31 +00:00
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// マウント
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2017-11-13 09:05:35 +00:00
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this.suggestion = (riot as any).mount(el, {
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2017-02-18 08:18:31 +00:00
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textarea: this.textarea,
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complete: this.complete,
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close: this.close,
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type: type,
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q: q
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})[0];
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}
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/**
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2017-11-13 09:05:35 +00:00
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* サジェストを閉じます。
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2017-02-18 08:18:31 +00:00
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*/
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2017-11-13 09:05:35 +00:00
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private close() {
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2017-02-18 22:24:31 +00:00
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if (this.suggestion == null) return;
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2017-02-18 08:18:31 +00:00
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this.suggestion.unmount();
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this.suggestion = null;
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this.textarea.focus();
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}
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/**
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2017-11-13 09:05:35 +00:00
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* オートコンプリートする
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2017-02-18 08:18:31 +00:00
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*/
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2017-11-13 09:05:35 +00:00
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private complete(user) {
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2017-02-18 08:18:31 +00:00
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this.close();
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const value = user.username;
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const caret = this.textarea.selectionStart;
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const source = this.textarea.value;
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const before = source.substr(0, caret);
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2017-02-27 08:01:26 +00:00
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const trimmedBefore = before.substring(0, before.lastIndexOf('@'));
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2017-02-18 08:18:31 +00:00
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const after = source.substr(caret);
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// 結果を挿入する
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2017-02-27 08:01:26 +00:00
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this.textarea.value = trimmedBefore + '@' + value + ' ' + after;
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2017-02-18 08:18:31 +00:00
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// キャレットを戻す
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this.textarea.focus();
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const pos = caret + value.length;
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this.textarea.setSelectionRange(pos, pos);
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}
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}
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2017-03-18 11:05:11 +00:00
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export default Autocomplete;
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