import { Observable } from 'rxjs/Observable';
export interface CameraPreviewRect {
    x: number;
    y: number;
    width: number;
    height: number;
}
export interface CameraPreviewSize {
    maxWidth: number;
    maxHeight: number;
}
/**
 * @beta
 * @name CameraPreview
 * @description
 * Showing camera preview in HTML
 *
 * For more info, please see the [Cordova Camera Preview Plugin Docs](https://github.com/cordova-plugin-camera-preview/cordova-plugin-camera-preview).
 *
 * @usage
 * ```
 * import { CameraPreview, CameraPreviewRect } from 'ionic-native';
 *
 * // camera options (Size and location)
 * let cameraRect: CameraPreviewRect = {
 *   x: 100,
 *   y: 100,
 *   width: 200,
 *   height: 200
 * };
 *
 *
 * // start camera
 * CameraPreview.startCamera(
 *   cameraRect, // position and size of preview
 *   'front', // default camera
 *   true, // tap to take picture
 *   false, // disable drag
 *   false, // keep preview in front. Set to true (back of the screen) to apply overlaying elements
 *   1 // set the preview alpha
 * );
 *
 * // Set the handler to run every time we take a picture
 * CameraPreview.setOnPictureTakenHandler().subscribe((result) => {
 *   console.log(result);
 *   // do something with the result
 * });
 *
 *
 * // take a picture
 * CameraPreview.takePicture({
 *   maxWidth: 640,
 *   maxHeight: 640
 * });
 *
 * // Switch camera
 * CameraPreview.switchCamera();
 *
 * // set color effect to negative
 * CameraPreview.setColorEffect('negative');
 *
 * // Stop the camera preview
 * CameraPreview.stopCamera();
 *
 * ```
 *
 * @interfaces
 * CameraPreviewRect
 * CameraPreviewSize
 */
export declare class CameraPreview {
    /**
     * Starts the camera preview instance.
     * @param {CameraPreviewRect} position and size of the preview window - {x: number, y: number, width: number, height: number}
     * @param {string} which camera to use - 'front' | 'back'
     * @param {boolean} enable tap to take picture
     * @param {boolean} enable preview box drag across the screen
     * @param {boolean} send preview box to the back of the webview
     * @param {number} alpha of the preview box
     */
    static startCamera(rect: CameraPreviewRect, defaultCamera: string, tapEnabled: boolean, dragEnabled: boolean, toBack: boolean, alpha: number): void;
    /**
     * Stops the camera preview instance.
     */
    static stopCamera(): void;
    /**
     * Take the picture, the parameter size is optional
     * @param {CameraPreviewSize} optional - size of the picture to take
     */
    static takePicture(size?: CameraPreviewSize): void;
    /**
     * Register a callback function that receives the original picture and the image captured from the preview box.
     * @returns {Observable<any>}
     */
    static setOnPictureTakenHandler(): Observable<any>;
    /**
     * Switch from the rear camera and front camera, if available.
     */
    static switchCamera(): void;
    /**
     * Show the camera preview box.
     */
    static show(): void;
    /**
     * Hide the camera preview box.
     */
    static hide(): void;
    /**
     * Disables the camera preview
     */
    static disable(): void;
    /**
     * Set camera color effect.
     */
    static setColorEffect(effect: string): void;
}