import type { Layout, LayoutItem } from '../types';
/**
 * Return the bottom coordinate of the layout.
 *
 * @param  {Array} layout Layout array.
 * @return {Number}       Bottom coordinate.
 */
export declare function bottom(layout: Layout): number;
export declare function calcContainerHeight(layout: any, opt: any): number;
export declare function cloneLayout(layout: Layout): Layout;
export declare function cloneLayoutItem(layoutItem: LayoutItem): LayoutItem;
/**
 * Given two layoutitems, check if they collide.
 *
 * @return {Boolean}   True if colliding.
 */
export declare function collides(l1: LayoutItem, l2: LayoutItem): boolean;
/**
 * Given a layout, compact it. This involves going down each y coordinate and removing gaps
 * between items.
 * @description 布局垂直方向往上顶
 * @param  {Array} layout Layout.
 * @param  {Boolean} verticalCompact Whether or not to compact the layout
 *   vertically.
 * @param {Object} minPositions
 * @return {Array}       Compacted Layout.
 */
export declare function compact(layout: Layout, verticalCompact: boolean, minPositions?: any): Layout;
/**
 * Compact an item in the layout.
 */
export declare function compactItem(compareWith: Layout, l: LayoutItem, verticalCompact: boolean, minPositions?: any): LayoutItem;
/**
 * Get a layout item by ID. Used so we can override later on if necessary.
 *
 * @param  {Array}  layout Layout array.
 * @param  {String} id     ID
 * @return {LayoutItem}    Item at ID.
 */
export declare function getLayoutItem(layout: Layout, id: string | number | undefined): LayoutItem | undefined;
/**
 * Returns the first item this layout collides with.
 * It doesn't appear to matter which order we approach this from, although
 * perhaps that is the wrong thing to do.
 *
 * @param  {Object} layout Layout
 * @param  {Object} layoutItem Layout item.
 * @return {Object|undefined}  A colliding layout item, or undefined.
 */
export declare function getFirstCollision(layout: Layout, layoutItem: LayoutItem): LayoutItem | undefined;
export declare function getAllCollisions(layout: Layout, layoutItem: LayoutItem): Array<LayoutItem>;
/**
 * Get all static elements.
 * @param  {Array} layout Array of layout objects.
 * @return {Array}        Array of static layout items..
 */
export declare function getStatics(layout: Layout): Array<LayoutItem>;
/**
 * Move an element. Responsible for doing cascading movements of other elements.
 *
 * @param  {Array}      layout Full layout to modify.
 * @param  {LayoutItem} l      element to move.
 * @param  {Number}     [x]    X position in grid units.
 * @param  {Number}     [y]    Y position in grid units.
 * @param  {Boolean}    [isUserAction] If true, designates that the item we're moving is
 *                                     being dragged/resized by th euser.
 * @param  {Boolean}    [preventCollision]
 */
export declare function moveElement(layout: Layout, l: LayoutItem, x: number | undefined, y: number | undefined, isUserAction?: boolean, preventCollision?: boolean): Layout;
/**
 * This is where the magic needs to happen - given a collision, move an element away from the collision.
 * We attempt to move it up if there's room, otherwise it goes below.
 *
 * @param  {Array} layout            Full layout to modify.
 * @param  {LayoutItem} collidesWith Layout item we're colliding with.
 * @param  {LayoutItem} itemToMove   Layout item we're moving.
 * @param  {Boolean} [isUserAction]  If true, designates that the item we're moving is being dragged/resized
 *                                   by the user.
 */
export declare function moveElementAwayFromCollision(layout: Layout, collidesWith: LayoutItem, itemToMove: LayoutItem, isUserAction?: boolean): Layout;
export interface TransformStyle {
    transform: string;
    WebkitTransform: string;
    MozTransform: string;
    msTransform: string;
    OTransform: string;
    width: string;
    height: string;
    position: 'absolute' | 'relative';
}
export declare function setTransform(top: number, left: number, width: number, height: number): TransformStyle;
export interface TopLeftStyle {
    top: string;
    left: string;
    width: string;
    height: string;
    position: 'absolute';
}
export declare function setTopLeft(top: number, left: number, width: number, height: number): TopLeftStyle;
/**
 * Get layout items sorted from top left to right and down.
 *
 * @return {Array} Array of layout objects.
 * @return {Array}        Layout, sorted static items first.
 */
export declare function sortLayoutItemsByRowCol(layout: Layout): Layout;
/**
 * Validate a layout. Throws errors.
 *
 * @param  {Array}  layout        Array of layout items.
 * @param  {String} [contextName] Context name for errors.
 * @throw  {Error}                Validation error.
 */
export declare function validateLayout(layout: Layout, contextName?: string): void;