import { IgxQueryBuilderTreeComponent } from './query-builder-tree.component';
import { ElementRef } from '@angular/core';
import { ExpressionGroupItem, ExpressionItem } from './query-builder.common';
import * as i0 from "@angular/core";
/** @hidden @internal */
export declare class IgxQueryBuilderDragService {
    /** The ExpressionItem that's actually the drop ghost's content */
    dropGhostExpression: ExpressionItem;
    isKeyboardDrag: boolean;
    private _queryBuilderTreeComponent;
    private _queryBuilderTreeComponentElRef;
    private _sourceExpressionItem;
    private _sourceElement;
    private _targetExpressionItem;
    private _dropUnder;
    private _ghostChipMousemoveSubscription$;
    private _keyboardSubscription$;
    private _keyDragCurrentIndex;
    private _keyDragInitialIndex;
    private _isKeyDragsFirstMove;
    /** Stores a flat ordered list of possible drop locations as Tuple <[targetExpression, dropUnder]>, while performing the keyboard drag&drop */
    private _possibleDropLocations;
    private _timeoutId;
    /** Get the dragged ghost as a HTMLElement*/
    private get getDragGhostElement();
    /** Get the drop ghost chip component */
    private get getDropGhostElement();
    private get getMainExpressionTree();
    register(tree: IgxQueryBuilderTreeComponent, el: ElementRef): void;
    /** When chip is picked up for dragging
     *
     * @param sourceDragElement The HTML element of the chip that's been dragged
     * @param sourceExpressionItem The expressionItem of the chip that's been dragged
     * @param isKeyboardDrag If it's a mouse drag or keyboard reorder
     *
    */
    onMoveStart(sourceDragElement: HTMLElement, sourceExpressionItem: ExpressionItem, isKeyboardDrag: boolean): void;
    /** When dragged chip is let go outside a proper drop zone */
    onMoveEnd(): void;
    /** When mouse drag enters a chip's area
     * @param targetDragElement The HTML element of the drop area chip that's been dragged to
     * @param targetExpressionItem The expressionItem of the drop area chip that's been dragged to
    */
    onChipEnter(targetDragElement: HTMLElement, targetExpressionItem: ExpressionItem): void;
    /** When mouse drag moves in a div's drop area
     * @param targetDragElement The HTML element of the drop area chip that's been dragged to
     * @param targetExpressionItem The expressionItem of the drop area chip that's been dragged to
    */
    onDivOver(targetDragElement: HTMLElement, targetExpressionItem: ExpressionItem): void;
    /** When mouse drag moves in a chip's drop area
     * @param targetDragElement The HTML element of the drop area chip that's been dragged to
    */
    onChipOver(targetDragElement: HTMLElement): void;
    /** When mouse drag leaves a chip's drop area */
    onChipLeave(): void;
    /** When dragged chip is let go in div's drop area
     * @param targetExpressionItem The expressionItem of the drop area chip that's been dragged to
    */
    onDivDropped(targetExpressionItem: ExpressionItem): void;
    /** When dragged chip is let go in chip's drop area */
    onChipDropped(): void;
    /** When mouse drag moves in a AND/OR drop area
     * @param targetDragElement The HTML element of the drop area chip that's been dragged to
     * @param targetExpressionItem The expressionItem of the drop area chip that's been dragged to
    */
    onGroupRootOver(targetDragElement: HTMLElement, targetExpressionItem: ExpressionGroupItem): void;
    /** When mouse drag moves in 'Add condition' button's drop area
     * @param addConditionElement The Add condition button HTML Element
     * @param rootGroup The root group of the query tree
    */
    onAddConditionEnter(addConditionElement: HTMLElement, rootGroup: ExpressionGroupItem): void;
    /** When chip's drag indicator is focused
     *
     * @param sourceDragElement The HTML element of the chip that's been dragged
     * @param sourceExpressionItem The expressionItem of the chip that's been dragged
     *
    */
    onChipDragIndicatorFocus(sourceDragElement: HTMLElement, sourceExpressionItem: ExpressionItem): void;
    /** When chip's drag indicator looses focus*/
    onChipDragIndicatorFocusOut(): void;
    /** Upon blurring the tree, if Keyboard drag is underway and the next active item is not the drop ghost's drag indicator icon, cancel the drag&drop procedure*/
    onDragFocusOut(): void;
    /** Checks if the dragged ghost is horizontally on the same line with the drop ghost*/
    private dragGhostIsOnDropGhostRow;
    /** Checks if the dragged ghost is north or south of a target element's center*/
    private ghostInLowerPart;
    /** Make a copy of the _sourceExpressionItem's chip and paste it in the tree north or south of the _targetExpressionItem's chip */
    private renderDropGhostChip;
    /** Set the cursor when dragging a ghost*/
    private setDragCursor;
    /** Removes the drop ghost expression from the tree and it's chip effectively  */
    private clearDropGhost;
    /** Reset Drag&Drop vars. Optionally the drag source vars too*/
    private resetDragAndDrop;
    /** Start listening for drag and drop specific keys */
    private listenToKeyboard;
    /** Perform up/down movement of drop ghost along the expression tree*/
    private arrowDrag;
    /** Produces a flat ordered list of possible drop locations as Tuple <[targetExpression, dropUnder]>, while performing the keyboard drag&drop */
    private getPossibleDropLocations;
    /** Counts how many chips will be in the tree (from top to bottom) before the dropped one */
    private countChipsBeforeDropLocation;
    /** Sets the z-index of the drag ghost with a little delay, since we don't have access to ghostCreated() but we know it's executed right after moveStart() */
    private setDragGhostZIndex;
    static ɵfac: i0.ɵɵFactoryDeclaration<IgxQueryBuilderDragService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<IgxQueryBuilderDragService>;
}