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+/*
+ * Copyright (C) 2020 Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
+class ClipboardMonitor {
+ constructor() {
+ this.timerId = null;
+ this.timerToken = null;
+ this.interval = 250;
+ this.previousText = null;
+ }
+
+ onClipboardText(_text) {
+ throw new Error('Override me');
+ }
+
+ start() {
+ this.stop();
+
+ // The token below is used as a unique identifier to ensure that a new clipboard monitor
+ // hasn't been started during the await call. The check below the await apiClipboardGet()
+ // call will exit early if the reference has changed.
+ const token = {};
+ const intervalCallback = async () => {
+ this.timerId = null;
+
+ let text = null;
+ try {
+ text = await apiClipboardGet();
+ } catch (e) {
+ // NOP
+ }
+ if (this.timerToken !== token) { return; }
+
+ if (
+ typeof text === 'string' &&
+ (text = text.trim()).length > 0 &&
+ text !== this.previousText
+ ) {
+ this.previousText = text;
+ if (jpIsStringPartiallyJapanese(text)) {
+ this.onClipboardText(text);
+ }
+ }
+
+ this.timerId = setTimeout(intervalCallback, this.interval);
+ };
+
+ this.timerToken = token;
+
+ intervalCallback();
+ }
+
+ stop() {
+ this.timerToken = null;
+ if (this.timerId !== null) {
+ clearTimeout(this.timerId);
+ this.timerId = null;
+ }
+ }
+
+ setPreviousText(text) {
+ this.previousText = text;
+ }
+}