saltfish/dist/patterns/Observer.d.ts

An interactive video-guided tour system for web applications

/**
 * Observer Pattern implementation
 *
 * This file implements the Observer pattern to decouple state changes from UI updates.
 * It provides a generic Subject and Observer interface that can be used throughout
 * the application.
 */
/**
 * Observable Subject interface
 * Represents an object that can be observed by multiple observers.
 */
export interface Subject<T> {
    /**
     * Register an observer to receive notifications
     * @param observer The observer to register
     */
    addObserver(observer: Observer<T>): void;
    /**
     * Remove an observer to stop receiving notifications
     * @param observer The observer to remove
     * @returns true if the observer was found and removed, false otherwise
     */
    removeObserver(observer: Observer<T>): boolean;
    /**
     * Notify all observers about a state change
     * @param data The data to pass to observers
     */
    notifyObservers(data: T): void;
}
/**
 * Observer interface
 * Represents an object that wants to be notified of changes in a Subject.
 */
export interface Observer<T> {
    /**
     * Handle a state change notification from a subject
     * @param data The data passed from the subject
     */
    update(data: T): void;
}
/**
 * Abstract Subject class that implements the core Subject functionality
 */
export declare abstract class AbstractSubject<T> implements Subject<T> {
    private observers;
    /**
     * Register an observer to receive notifications
     * @param observer The observer to register
     */
    addObserver(observer: Observer<T>): void;
    /**
     * Remove an observer to stop receiving notifications
     * @param observer The observer to remove
     * @returns true if the observer was found and removed, false otherwise
     */
    removeObserver(observer: Observer<T>): boolean;
    /**
     * Notify all observers about a state change
     * @param data The data to pass to observers
     */
    notifyObservers(data: T): void;
}
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