/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Directionality } from 'cdk/bidi';
import { NumberInput } from 'cdk/coercion';
import { ElementRef, OnDestroy } from '@angular/core';
import { CdkTree, CdkTreeNode } from './tree';
/**
 * Indent for the children tree dataNodes.
 * This directive will add left-padding to the node to show hierarchy.
 */
import * as ɵngcc0 from '@angular/core';
export declare class CdkTreeNodePadding<T, K = T> implements OnDestroy {
	private _treeNode;
	private _tree;
	private _element;
	private _dir;
	/** Current padding value applied to the element. Used to avoid unnecessarily hitting the DOM. */
	private _currentPadding;
	/** Subject that emits when the component has been destroyed. */
	private readonly _destroyed;
	/** CSS units used for the indentation value. */
	indentUnits: string;
	/** The level of depth of the tree node. The padding will be `level * indent` pixels. */
	get level(): number;
	set level(value: number);
	_level: number;
	/**
	 * The indent for each level. Can be a number or a CSS string.
	 * Default number 40px from material design menu sub-menu spec.
	 */
	get indent(): number | string;
	set indent(indent: number | string);
	_indent: number;
	constructor(
		_treeNode: CdkTreeNode<T, K>,
		_tree: CdkTree<T, K>,
		_element: ElementRef<HTMLElement>,
		_dir: Directionality
	);
	ngOnDestroy(): void;
	/** The padding indent value for the tree node. Returns a string with px numbers if not null. */
	_paddingIndent(): string | null;
	_setPadding(forceChange?: boolean): void;
	/**
	 * This has been extracted to a util because of TS 4 and VE.
	 * View Engine doesn't support property rename inheritance.
	 * TS 4.0 doesn't allow properties to override accessors or vice-versa.
	 * @docs-private
	 */
	protected _setLevelInput(value: number): void;
	/**
	 * This has been extracted to a util because of TS 4 and VE.
	 * View Engine doesn't support property rename inheritance.
	 * TS 4.0 doesn't allow properties to override accessors or vice-versa.
	 * @docs-private
	 */
	protected _setIndentInput(indent: number | string): void;
	static ngAcceptInputType_level: NumberInput;
	static ɵfac: ɵngcc0.ɵɵFactoryDef<
		CdkTreeNodePadding<any, any>,
		[null, null, null, { optional: true }]
	>;
	static ɵdir: ɵngcc0.ɵɵDirectiveDefWithMeta<
		CdkTreeNodePadding<any, any>,
		'[cdkTreeNodePadding]',
		never,
		{ level: 'cdkTreeNodePadding'; indent: 'cdkTreeNodePaddingIndent' },
		{},
		never
	>;
}

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