1 files changed, 64 insertions, 0 deletions
diff --git a/ext/js/display/search-persistent-state-controller.js b/ext/js/display/search-persistent-state-controller.js
new file mode 100644
index 00000000..56beebc7
--- /dev/null
+++ b/ext/js/display/search-persistent-state-controller.js
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 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 SearchPersistentStateController {
+    constructor() {
+        this._mode = null;
+    }
+
+    get mode() {
+        return this._mode;
+    }
+
+    set mode(value) {
+        this._setMode(value, true);
+    }
+
+    prepare() {
+        this._updateMode();
+    }
+
+    // Private
+
+    _updateMode() {
+        let mode = null;
+        try {
+            mode = sessionStorage.getItem('mode');
+        } catch (e) {
+            // Browsers can throw a SecurityError when cookie blocking is enabled.
+        }
+        this._setMode(mode, false);
+    }
+
+    _setMode(mode, save) {
+        if (mode === this._mode) { return; }
+        if (save) {
+            try {
+                if (mode === null) {
+                    sessionStorage.removeItem('mode');
+                } else {
+                    sessionStorage.setItem('mode', mode);
+                }
+            } catch (e) {
+                // Browsers can throw a SecurityError when cookie blocking is enabled.
+            }
+        }
+        this._mode = mode;
+        document.documentElement.dataset.searchMode = (mode !== null ? mode : '');
+        this._updateClipboardMonitorEnabled();
+    }
+}