Function getAncestor

packages/core/ui/core/view-base/index.ts:110–126

(view: T, criterion: string | { new () })

 * Returns an instance of a view (if found), otherwise undefined.
 */
export function getAncestor<T extends ViewBase = ViewBase>(view: T, criterion: string | { new () }): T {
	let matcher: (view: ViewBase) => view is T;

	if (typeof criterion === 'string') {
		matcher = (view: ViewBase): view is T => view.typeName === criterion;
	} else {
		matcher = (view: ViewBase): view is T => view instanceof criterion;
	}

	for (let parent = view.parent; parent != null; parent = parent.parent) {
		if (matcher(parent)) {
			return parent;
		}
	}

	return null;
}

/**
 * Gets a child view by id.