import { FocusableOption, FocusMonitor, FocusOrigin } from '@angular/cdk/a11y';
import { ChangeDetectorRef, ElementRef, OnDestroy } from '@angular/core';
import { TsExpansionPanelComponent, TsExpansionPanelDefaultOptions } from '../expansion-panel.component';
/**
 * Trigger to open/close a {@link TsExpansionPanelComponent}
 *
 * @example
 * <ts-expansion-panel>
 *               <ts-expansion-panel-trigger
 *                 collapsedHeight="100px"
 *                 expandedHeight="150px"
 *               >
 *                 Panel trigger
 *               </ts-expansion-panel-trigger>
 *
 *               Panel content
 * </ts-expansion-panel>
 *
 * <example-url>https://getterminus.github.io/ui-demos-release/components/expansion-panel</example-url>
 */
export declare class TsExpansionPanelTriggerComponent implements OnDestroy, FocusableOption {
    panel: TsExpansionPanelComponent;
    private elementRef;
    private focusMonitor;
    private changeDetectorRef;
    /**
     * Determine the current expanded state string of the panel
     */
    get currentPanelExpandedState(): string;
    /**
     * Determine if the panel is currently expanded
     */
    get isExpanded(): boolean;
    /**
     * Determine if current mode is transparent
     */
    get isTransparent(): boolean;
    /**
     * Whether the associated panel is disabled.
     *
     * Implemented as a part of `FocusableOption`.
     */
    get disabled(): boolean;
    /** Gets whether the expand indicator should be shown. */
    get shouldShowToggle(): boolean;
    /**
     * Height of the trigger while the panel is collapsed
     */
    collapsedHeight: string | undefined;
    /**
     * Height of the trigger while the panel is expanded
     */
    expandedHeight: string | undefined;
    constructor(panel: TsExpansionPanelComponent, elementRef: ElementRef, focusMonitor: FocusMonitor, changeDetectorRef: ChangeDetectorRef, defaultOptions?: TsExpansionPanelDefaultOptions);
    /**
     * Stop monitoring focus events
     */
    ngOnDestroy(): void;
    /**
     * Focuses the panel trigger.
     *
     * Implemented as a part of `FocusableOption`.
     *
     * @param origin - Origin of the action that triggered the focus.
     */
    focus(origin?: FocusOrigin): void;
    /**
     * Toggle the expanded state of the panel
     */
    toggle(): void;
    /**
     * Handle keydown event calling to toggle() if appropriate
     *
     * @param event
     */
    keydown(event: KeyboardEvent): void;
}