import Style from "../../Style";
import ControlElement from "./ControlElement";
import { ComponentFactory, ValueOrAsync } from "../ComponentFactory";
/** Represents a canvas control */
export declare class Canvas extends ControlElement {
    /** Create a canvas element */
    constructor(width?: number, height?: number, scale?: number);
    /** Initialize an image control with given values */
    static with: (values: Canvas.Initializer) => ComponentFactory<Canvas>;
    /** Initialize with given (observable) values; returns this */
    initializeWith: (values: Canvas.Initializer) => this;
    /** Component height (CSS value, observed) */
    height: string;
    /** Canvas scale (i.e. if set to 1, a pixel on screen corresponds to 1 unit on the canvas coordinate system), only works if this component has width and height properties set in pixels; (observed) */
    scale: number;
    /** Set to false to expand horizontally within row (observed); note that canvas itself will be scaled up, not resized */
    shrinkwrap: boolean;
    /** The 2D rendering context from the canvas element (read-only) */
    readonly drawingContext: CanvasRenderingContext2D;
    /** Clear the entire canvas */
    clear(): void;
    /** Get the current image as a data URL */
    getImageDataURL(mimeType?: string): string;
    /** Get the current image as a blob (promise); note not all browsers support the native canvas [ms]`toBlob(...)` method */
    getImageBlob(mimeType?: string): PromiseLike<Blob | null>;
    /** Encapsulation of canvas element style (observed) */
    readonly style_canvas: Style;
    private _canvasElement;
    private _2dCtx;
}
export declare namespace Canvas {
    /** Initializer for .with({ ... }) */
    interface Initializer extends ControlElement.Initializer {
        /** Property initializer */
        width: ValueOrAsync<string>;
        /** Property initializer */
        height: ValueOrAsync<string>;
        /** Property initializer */
        scale?: ValueOrAsync<number>;
        /** Property initializer */
        style_canvas?: ValueOrAsync<Style | Style.StyleSet>;
    }
}
export default Image;