81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
/*
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* Copyright (C) 2020-2022 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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class ClipboardMonitor extends EventDispatcher {
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constructor({japaneseUtil, clipboardReader}) {
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super();
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this._japaneseUtil = japaneseUtil;
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this._clipboardReader = clipboardReader;
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this._timerId = null;
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this._timerToken = null;
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this._interval = 250;
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this._previousText = null;
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}
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start() {
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this.stop();
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// The token below is used as a unique identifier to ensure that a new clipboard monitor
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// hasn't been started during the await call. The check below the await call
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// will exit early if the reference has changed.
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let canChange = false;
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const token = {};
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const intervalCallback = async () => {
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this._timerId = null;
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let text = null;
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try {
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text = await this._clipboardReader.getText();
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} catch (e) {
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// NOP
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}
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if (this._timerToken !== token) { return; }
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if (
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typeof text === 'string' &&
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(text = text.trim()).length > 0 &&
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text !== this._previousText
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) {
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this._previousText = text;
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if (canChange && this._japaneseUtil.isStringPartiallyJapanese(text)) {
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this.trigger('change', {text});
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}
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}
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canChange = true;
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this._timerId = setTimeout(intervalCallback, this._interval);
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};
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this._timerToken = token;
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intervalCallback();
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}
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stop() {
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this._timerToken = null;
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this._previousText = null;
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if (this._timerId !== null) {
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clearTimeout(this._timerId);
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this._timerId = null;
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}
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}
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setPreviousText(text) {
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this._previousText = text;
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}
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}
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