aboutsummaryrefslogtreecommitdiff
path: root/ext/js/comm/clipboard-monitor.js
diff options
context:
space:
mode:
Diffstat (limited to 'ext/js/comm/clipboard-monitor.js')
-rw-r--r--ext/js/comm/clipboard-monitor.js80
1 files changed, 80 insertions, 0 deletions
diff --git a/ext/js/comm/clipboard-monitor.js b/ext/js/comm/clipboard-monitor.js
new file mode 100644
index 00000000..7379d7ad
--- /dev/null
+++ b/ext/js/comm/clipboard-monitor.js
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2020-2021 Yomichan Authors
+ *
+ * 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 extends EventDispatcher {
+ constructor({japaneseUtil, clipboardReader}) {
+ super();
+ this._japaneseUtil = japaneseUtil;
+ this._clipboardReader = clipboardReader;
+ this._timerId = null;
+ this._timerToken = null;
+ this._interval = 250;
+ this._previousText = null;
+ }
+
+ 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 call
+ // will exit early if the reference has changed.
+ let canChange = false;
+ const token = {};
+ const intervalCallback = async () => {
+ this._timerId = null;
+
+ let text = null;
+ try {
+ text = await this._clipboardReader.getText();
+ } catch (e) {
+ // NOP
+ }
+ if (this._timerToken !== token) { return; }
+
+ if (
+ typeof text === 'string' &&
+ (text = text.trim()).length > 0 &&
+ text !== this._previousText
+ ) {
+ this._previousText = text;
+ if (canChange && this._japaneseUtil.isStringPartiallyJapanese(text)) {
+ this.trigger('change', {text});
+ }
+ }
+
+ canChange = true;
+ this._timerId = setTimeout(intervalCallback, this._interval);
+ };
+
+ this._timerToken = token;
+
+ intervalCallback();
+ }
+
+ stop() {
+ this._timerToken = null;
+ this._previousText = null;
+ if (this._timerId !== null) {
+ clearTimeout(this._timerId);
+ this._timerId = null;
+ }
+ }
+
+ setPreviousText(text) {
+ this._previousText = text;
+ }
+}