85 lines
2.2 KiB
JavaScript
85 lines
2.2 KiB
JavaScript
/**
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* This file is part of Radicale Server - Calendar Server
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* Copyright © 2017-2024 Unrud <unrud@outlook.com>
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* Copyright © 2023-2024 Matthew Hana <matthew.hana@gmail.com>
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* Copyright © 2024-2025 Peter Bieringer <pb@bieringer.de>
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* Copyright © 2026-2026 Max Berger <max@berger.name>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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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* This program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @interface
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*/
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export class Scene {
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constructor() { }
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/**
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* Scene is on top of stack and visible.
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*/
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show() { }
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/**
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* Scene is no longer visible.
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*/
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hide() { }
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/**
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* Scene is removed from scene stack.
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*/
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release() { }
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}
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/**
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* @type {Array<Scene>}
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*/
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export let scene_stack = [];
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/**
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* Push scene onto stack.
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* @param {Scene} scene
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* @param {boolean} replace Replace the scene on top of the stack.
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*/
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export function push_scene(scene, replace) {
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if (scene_stack.length >= 1) {
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scene_stack[scene_stack.length - 1].hide();
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if (replace) {
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scene_stack.pop().release();
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}
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}
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scene_stack.push(scene);
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scene.show();
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}
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/**
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* Remove scenes from stack.
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* @param {number} index New top of stack
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*/
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export function pop_scene(index) {
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if (scene_stack.length - 1 <= index) {
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return;
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}
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scene_stack[scene_stack.length - 1].hide();
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while (scene_stack.length - 1 > index) {
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let old_length = scene_stack.length;
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scene_stack.pop().release();
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if (old_length - 1 === index + 1) {
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break;
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}
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}
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if (scene_stack.length >= 1) {
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let scene = scene_stack[scene_stack.length - 1];
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scene.show();
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} else {
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throw "Scene stack is empty";
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}
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} |