jakciehan
100 lines
2.6 KiB
JavaScript
100 lines
2.6 KiB
JavaScript
/**
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* SceneManager.js
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* Manages scene registration, switching, and lifecycle (enter/exit/update/render).
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*/
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class SceneManager {
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constructor() {
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/** @type {Map<string, object>} Registered scene instances */
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this._scenes = new Map();
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/** @type {object|null} Current active scene */
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this._currentScene = null;
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/** @type {string|null} Current scene name */
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this._currentName = null;
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/** @type {boolean} Whether a transition is in progress */
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this._transitioning = false;
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}
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/**
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* Register a scene.
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* A scene object should implement: enter(params), exit(), update(dt), render(ctx).
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* @param {string} name - Unique scene name.
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* @param {object} scene - Scene instance.
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*/
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register(name, scene) {
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this._scenes.set(name, scene);
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}
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/**
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* Switch to a different scene.
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* @param {string} name - Target scene name.
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* @param {object} [params] - Optional parameters passed to the new scene's enter().
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*/
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switchTo(name, params) {
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if (this._transitioning) return;
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if (!this._scenes.has(name)) {
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console.error(`[SceneManager] Scene "${name}" not registered.`);
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return;
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}
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this._transitioning = true;
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// Exit current scene
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if (this._currentScene && typeof this._currentScene.exit === 'function') {
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this._currentScene.exit();
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}
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// Enter new scene
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this._currentName = name;
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this._currentScene = this._scenes.get(name);
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if (typeof this._currentScene.enter === 'function') {
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this._currentScene.enter(params || {});
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}
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this._transitioning = false;
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}
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/**
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* Update the current scene.
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* @param {number} dt - Delta time in seconds.
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*/
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update(dt) {
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if (this._currentScene && typeof this._currentScene.update === 'function') {
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this._currentScene.update(dt);
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}
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}
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/**
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* Render the current scene.
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* @param {CanvasRenderingContext2D} ctx
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*/
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render(ctx) {
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if (this._currentScene && typeof this._currentScene.render === 'function') {
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this._currentScene.render(ctx);
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}
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}
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/**
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* Forward touch events to the current scene.
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* @param {string} eventType - 'touchstart' | 'touchmove' | 'touchend'
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* @param {TouchEvent} e
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*/
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handleTouch(eventType, e) {
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if (this._currentScene && typeof this._currentScene.handleTouch === 'function') {
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this._currentScene.handleTouch(eventType, e);
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}
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}
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/** Get the current scene name. */
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get currentName() {
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return this._currentName;
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}
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/** Get the current scene instance. */
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get currentScene() {
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return this._currentScene;
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}
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}
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module.exports = SceneManager;
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