class ViewController {
	constructor(element) {
		this.element = element;
		this.allSubviews = [ ];
	}

	/**
	 * Called when the view controller was loaded on launch.
	 * Use this function to do some additional preparation before the view is shown.
	 * This function will be called once only. If you want to do something everytime before the view is shown, use viewWillAppear().
	 * Since the view is not necessarily going to be shown after this call, no layout is done yet at this step.
	 */
	viewDidLoad() { }

	/**
	 * Called everytime before the view is shown.
	 * The layout is already done at this step, so it's safe to use scrollWidth and scrollHeight and what not.
	 */
	viewWillAppear() { }

	/**
	 * Called everytime after the view is shown.
	 */
	viewDidAppear() { }

	/**
	 * Called everytime before the view is shown.
	 * The layout is already done at this step, so it's safe to use scrollWidth and scrollHeight and what not.
	 */
	subviewsWillAppear() {
		for (var i = 0; i < this.allSubviews.length; i++) {
			this.allSubviews[i].viewWillAppear();
		}
	}

	/**
	 * Called everytime after the view is shown.
	 */
	subviewsDidAppear() {
		for (var i = 0; i < this.allSubviews.length; i++) {
			this.allSubviews[i].viewDidAppear();
		}
	}

	/**
	 * Called everytime before the view is hidden.
	 */
	viewWillDisappear() { }

	/**
	 * Called everytime after the view is hidden.
	 */
	viewDidDisappear() { }

	/**
	 * Called everytime before the view is hidden.
	 */
	subviewsWillDisappear() {
		for (var i = 0; i < this.allSubviews.length; i++) {
			this.allSubviews[i].viewWillDisappear();
		}
	}

	/**
	 * Called everytime after the view is hidden.
	 */
	subviewsDidDisappear() {
		for (var i = 0; i < this.allSubviews.length; i++) {
			this.allSubviews[i].viewDidDisappear();
		}
	}

	dismissModally() {
		this.scene.dismissModalViewController();
	}

	presentModalViewController(viewController) {
		this.scene.showViewControllerModally(viewController);
	}
}

UIKit.registerViewControllerType(ViewController);