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-rw-r--r--ext/bg/js/page-exit-prevention.js59
1 files changed, 0 insertions, 59 deletions
diff --git a/ext/bg/js/page-exit-prevention.js b/ext/bg/js/page-exit-prevention.js
deleted file mode 100644
index f55cf024..00000000
--- a/ext/bg/js/page-exit-prevention.js
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * Copyright (C) 2019-2020 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 PageExitPrevention {
- constructor() {
- }
-
- start() {
- PageExitPrevention._addInstance(this);
- }
-
- end() {
- PageExitPrevention._removeInstance(this);
- }
-
- static _addInstance(instance) {
- const size = PageExitPrevention._instances.size;
- PageExitPrevention._instances.set(instance, true);
- if (size === 0) {
- window.addEventListener('beforeunload', PageExitPrevention._onBeforeUnload);
- }
- }
-
- static _removeInstance(instance) {
- if (
- PageExitPrevention._instances.delete(instance) &&
- PageExitPrevention._instances.size === 0
- ) {
- window.removeEventListener('beforeunload', PageExitPrevention._onBeforeUnload);
- }
- }
-
- static _onBeforeUnload(e) {
- if (PageExitPrevention._instances.size === 0) {
- return;
- }
-
- e.preventDefault();
- e.returnValue = '';
- return '';
- }
-}
-
-PageExitPrevention._instances = new Map();