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fluxer_app/src/stores/OverlayStackStore.tsx

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+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {makeAutoObservable} from 'mobx';
+
+const BASE_Z_INDEX = 10000;
+const Z_INDEX_INCREMENT = 10;
+
+class OverlayStackStore {
+	private counter = 0;
+
+	constructor() {
+		makeAutoObservable(this, {}, {autoBind: true});
+	}
+
+	acquire(): number {
+		const zIndex = BASE_Z_INDEX + this.counter * Z_INDEX_INCREMENT;
+		this.counter++;
+		return zIndex;
+	}
+
+	release(): void {
+		if (this.counter > 0) {
+			this.counter--;
+		}
+	}
+
+	peek(): number {
+		return BASE_Z_INDEX + this.counter * Z_INDEX_INCREMENT;
+	}
+
+	reset(): void {
+		this.counter = 0;
+	}
+}
+
+export default new OverlayStackStore();