59 lines
1.4 KiB
TypeScript
59 lines
1.4 KiB
TypeScript
/*
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* Copyright (C) 2026 Fluxer Contributors
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*
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* This file is part of Fluxer.
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*
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* Fluxer is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Fluxer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
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*/
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import {makeAutoObservable} from 'mobx';
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const BASE_Z_INDEX = 10000;
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const Z_INDEX_INCREMENT = 10;
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class OverlayStackStore {
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private counter = 0;
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private sequence = 0;
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constructor() {
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makeAutoObservable(this, {}, {autoBind: true});
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}
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acquire(): number {
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const zIndex = BASE_Z_INDEX + this.sequence * Z_INDEX_INCREMENT;
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this.sequence++;
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this.counter++;
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return zIndex;
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}
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release(): void {
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if (this.counter === 0) return;
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this.counter--;
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if (this.counter === 0) {
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this.sequence = 0;
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}
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}
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peek(): number {
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return BASE_Z_INDEX + this.sequence * Z_INDEX_INCREMENT;
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}
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reset(): void {
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this.counter = 0;
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this.sequence = 0;
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}
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}
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export default new OverlayStackStore();
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