import { Context, ContextManager } from '../context';
import { Observable } from '../observable';
/**
 * Context containing snapshot information.
 * @zcontext
 *  */
export declare class SnapshotContext extends Context {
    /**
     * Observable holding the current canvas image data URL.
     * @zui
     */
    readonly canvasImage: Observable<string, never>;
    /**
     * Observable indicating whether the Share API is supported in the current environment.
     * @zui
     */
    readonly shareAPISupported: Observable<boolean, never>;
    /**
     * Observable determining if the current canvas content can be shared.
     * @zui
     */
    readonly canShare: Observable<boolean, never>;
    /**
     * Observable containing the canvas image as a File object.
     */
    readonly canvasFile: Observable<File | null, never>;
    /**
     * Observable storing the file name for the snapshot.
     * Updates the file upon change.
     */
    readonly fileName: Observable<string, never>;
    /**
     * Observable holding the text content to be shared with the snapshot.
     */
    readonly text: Observable<string, never>;
    /**
     * Observable containing the title for the snapshot.
     */
    readonly title: Observable<string, never>;
    /**
     * Observable storing the file type for the snapshot (e.g., 'image/png').
     * Updates the file upon change.
     */
    readonly fileType: Observable<string, never>;
    /**
     * Observable representing the quality setting of the snapshot image.
     */
    readonly quality: Observable<number, never>;
    /**
     * Creates an instance of SnapshotContext.
     * @param contextManager - The current ContextManager
     */
    constructor(contextManager: ContextManager);
    /**
     * Converts the canvas image to a file.
     */
    updateFile: () => Promise<void>;
}
/**
 * Retrieves the current canvas image as a data URL.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable containing the canvas image data URL.
 */
export declare function useCanvasImage(ctx: ContextManager): Observable<string, never>;
/**
 * Checks if the Share API is supported in the current environment.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable indicating whether the Share API is supported.
 */
export declare function useShareAPISupported(ctx: ContextManager): Observable<boolean, never>;
/**
 * Determines if the current canvas content can be shared via the Share API.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable indicating whether the canvas can be shared.
 */
export declare function useCanShare(ctx: ContextManager): Observable<boolean, never>;
/**
 * Retrieves the file representation of the canvas image.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable containing the canvas image as a File object.
 */
export declare function useCanvasFile(ctx: ContextManager): Observable<File | null, never>;
/**
 * Retrieves the file name for the snapshot to be shared.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable containing the file name.
 */
export declare function useFileName(ctx: ContextManager): Observable<string, never>;
/**
 * Retrieves the text content to be shared along with the snapshot.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable containing the share text.
 */
export declare function useText(ctx: ContextManager): Observable<string, never>;
/**
 * Retrieves the title for the snapshot to be shared.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable containing the share title.
 */
export declare function useTitle(ctx: ContextManager): Observable<string, never>;
/**
 * Retrieves the file type for the snapshot to be shared.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable containing the file type (e.g., 'image/png').
 */
export declare function useFileType(ctx: ContextManager): Observable<string, never>;
/**
 * Retrieves the quality setting for the snapshot image.
 * @param ctx The ContextManager instance to access the SnapshotContext.
 * @returns An Observable containing the image quality value.
 */
export declare function useQuality(ctx: ContextManager): Observable<number, never>;