Move JavaScript files into subdirectories

radicale/web/internal_data/js/scenes/scene_manager.js

@@ -0,0 +1,85 @@
+/**
+ * This file is part of Radicale Server - Calendar Server
+ * Copyright © 2017-2024 Unrud <unrud@outlook.com>
+ * Copyright © 2023-2024 Matthew Hana <matthew.hana@gmail.com>
+ * Copyright © 2024-2025 Peter Bieringer <pb@bieringer.de>
+ * Copyright © 2026-2026 Max Berger <max@berger.name>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @interface
+ */
+export class Scene {
+    constructor() { }
+    /**
+     * Scene is on top of stack and visible.
+     */
+    show() { }
+    /**
+     * Scene is no longer visible.
+     */
+    hide() { }
+    /**
+     * Scene is removed from scene stack.
+     */
+    release() { }
+}
+
+
+/**
+ * @type {Array<Scene>}
+ */
+export let scene_stack = [];
+
+/**
+ * Push scene onto stack.
+ * @param {Scene} scene
+ * @param {boolean} replace Replace the scene on top of the stack.
+ */
+export function push_scene(scene, replace) {
+    if (scene_stack.length >= 1) {
+        scene_stack[scene_stack.length - 1].hide();
+        if (replace) {
+            scene_stack.pop().release();
+        }
+    }
+    scene_stack.push(scene);
+    scene.show();
+}
+
+/**
+ * Remove scenes from stack.
+ * @param {number} index New top of stack
+ */
+export function pop_scene(index) {
+    if (scene_stack.length - 1 <= index) {
+        return;
+    }
+    scene_stack[scene_stack.length - 1].hide();
+    while (scene_stack.length - 1 > index) {
+        let old_length = scene_stack.length;
+        scene_stack.pop().release();
+        if (old_length - 1 === index + 1) {
+            break;
+        }
+    }
+    if (scene_stack.length >= 1) {
+        let scene = scene_stack[scene_stack.length - 1];
+        scene.show();
+    } else {
+        throw "Scene stack is empty";
+    }
+}