import { SelectorElement } from '../Selector/SelectorElement';
import type { SelectorItemElement } from '../Selector/SelectorItemElement';
import type { IMultiSelectorElementProps } from './IMultiSelectorElementProps';
/**
 * Multi Selector - An abstract foundation for components supporting multiple simultaneous item selections.
 *
 * @description
 * The MultiSelectorElement extends the base SelectorElement to provide multi-selection capabilities,
 * allowing users to select multiple items concurrently from a collection. This element maintains
 * an array of selected items, handles toggle behavior (selecting an already-selected item will
 * deselect it), and emits selection change events for reactive UI updates. It is designed to be
 * extended by concrete implementations such as checkbox lists, multi-select dropdowns, tag pickers,
 * chip selectors, or any component requiring multi-item selection patterns. The element integrates
 * with keyboard navigation and provides comprehensive selection state management.
 *
 * @name Multi Selector
 * @category Selectors
 *
 * @fires selectionChanged {SelectionChangedEvent} - Fired when any item is selected or deselected, providing old and new selected items
 * @fires itemsChanged {ItemsChangedEvent} - Fired when the slotted items collection changes
 * @fires changed {PropertyChangedEvent} - Fired when any property changes
 * @fires connected {ConnectedEvent} - Fired when the element is connected to the DOM
 *
 * @keyhandle Home - Selects or toggles the first item
 * @keyhandle End - Selects or toggles the last item
 *
 * @example
 * Extending for a multi-select list:
 * ```typescript
 * class CheckboxListElement extends MultiSelectorElement<CheckboxItemElement> {
 *   constructor() {
 *     super();
 *     this.selectionChanged.subscribe(({ oldValue, newValue }) => {
 *       console.log('Selection changed:', this.selectedItems);
 *     });
 *   }
 * }
 * ```
 *
 * @example
 * Using multi-selection with custom items:
 * ```html
 * <mosaik-multi-select>
 *   <mosaik-option value="apple">Apple</mosaik-option>
 *   <mosaik-option value="banana">Banana</mosaik-option>
 *   <mosaik-option value="orange">Orange</mosaik-option>
 * </mosaik-multi-select>
 * ```
 *
 * @example
 * Accessing selected items programmatically:
 * ```typescript
 * const multiSelect = document.querySelector('my-multi-selector');
 * multiSelect.select(0); // Select first item
 * multiSelect.select(2); // Select third item (both now selected)
 * console.log(multiSelect.selectedItems); // Array of selected item elements
 * ```
 *
 * @example
 * Listening to selection changes:
 * ```typescript
 * const selector = document.querySelector('my-multi-selector');
 * selector.addEventListener('selectionChanged', (event) => {
 *   const selected = event.target.selectedItems;
 *   console.log(`${selected.length} items selected`);
 *   selected.forEach(item => console.log(item.value));
 * });
 * ```
 *
 * @public
 * @abstract
 */
export declare abstract class MultiSelectorElement<TItem extends SelectorItemElement = any> extends SelectorElement<TItem> implements IMultiSelectorElementProps {
    private readonly _selectedItems;
    /**
     * @public
     */
    constructor();
    /**
     * Returns the `is` property.
     * The `is` property represents natural name of this element.
     *
     * @public
     * @static
     * @override
     * @readonly
     */
    static get is(): string;
    /**
     * Gets the first item in the current selection or returns null if the selection is empty.
     *
     * @private
     * @readonly
     */
    get selectedItems(): Array<TItem>;
    /**
     * @protected
     * @override
     */
    protected onSelectionChanged(oldIndex: number, newIndex: number, cb?: ((prev: TItem | null | undefined, next: TItem | null | undefined) => void)): void;
}
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