Sharkey/src/web/app/desktop/scripts/autocomplete.ts

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TypeScript
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import getCaretCoordinates = require('textarea-caret');
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import * as riot from 'riot';
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/**
*
*/
class Autocomplete {
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private suggestion: any;
private textarea: any;
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/**
*
*/
constructor(textarea) {
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// BIND ---------------------------------
this.onInput = this.onInput.bind(this);
this.complete = this.complete.bind(this);
this.close = this.close.bind(this);
// --------------------------------------
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this.suggestion = null;
this.textarea = textarea;
}
/**
*
*/
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public attach() {
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this.textarea.addEventListener('input', this.onInput);
}
/**
*
*/
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public detach() {
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this.textarea.removeEventListener('input', this.onInput);
this.close();
}
/**
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*
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*/
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private onInput() {
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this.close();
const caret = this.textarea.selectionStart;
const text = this.textarea.value.substr(0, caret);
const mentionIndex = text.lastIndexOf('@');
if (mentionIndex == -1) return;
const username = text.substr(mentionIndex + 1);
if (!username.match(/^[a-zA-Z0-9-]+$/)) return;
this.open('user', username);
}
/**
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*
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*/
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private open(type, q) {
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// 既に開いているサジェストは閉じる
this.close();
// サジェスト要素作成
const tag = document.createElement('mk-autocomplete-suggestion');
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// ~ 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 + window.pageXOffset + caretPosition.left;
const y = rect.top + window.pageYOffset + caretPosition.top;
tag.style.left = x + 'px';
tag.style.top = y + 'px';
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// 要素追加
const el = document.body.appendChild(tag);
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// マウント
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this.suggestion = (riot as any).mount(el, {
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textarea: this.textarea,
complete: this.complete,
close: this.close,
type: type,
q: q
})[0];
}
/**
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*
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*/
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private close() {
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if (this.suggestion == null) return;
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this.suggestion.unmount();
this.suggestion = null;
this.textarea.focus();
}
/**
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*
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*/
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private complete(user) {
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this.close();
const value = user.username;
const caret = this.textarea.selectionStart;
const source = this.textarea.value;
const before = source.substr(0, caret);
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const trimmedBefore = before.substring(0, before.lastIndexOf('@'));
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const after = source.substr(caret);
// 結果を挿入する
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this.textarea.value = trimmedBefore + '@' + value + ' ' + after;
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// キャレットを戻す
this.textarea.focus();
const pos = caret + value.length;
this.textarea.setSelectionRange(pos, pos);
}
}
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export default Autocomplete;