blockly/core/keyboard_nav/navigation_policies/connection_navigation_policy.d.ts

Blockly is a library for building visual programming editors.

/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import type { IFocusableNode } from '../../interfaces/i_focusable_node.js';
import type { INavigationPolicy } from '../../interfaces/i_navigation_policy.js';
import { RenderedConnection } from '../../rendered_connection.js';
/**
 * Set of rules controlling keyboard navigation from a connection.
 */
export declare class ConnectionNavigationPolicy implements INavigationPolicy<RenderedConnection> {
    /**
     * Returns the first child of a connection.
     *
     * @returns Null, as connections do not have children.
     */
    getFirstChild(): IFocusableNode | null;
    /**
     * Returns the parent of the given connection.
     *
     * @param current The connection to return the parent of.
     * @returns The given connection's parent block.
     */
    getParent(current: RenderedConnection): IFocusableNode | null;
    /**
     * Returns the next element following the given connection.
     *
     * @param current The connection to navigate from.
     * @returns The field, input connection or block following this connection.
     */
    getNextSibling(current: RenderedConnection): IFocusableNode | null;
    /**
     * Returns the element preceding the given connection.
     *
     * @param current The connection to navigate from.
     * @returns The field, input connection or block preceding this connection.
     */
    getPreviousSibling(current: RenderedConnection): IFocusableNode | null;
    /**
     * Returns the row ID of the given connection.
     *
     * @param current The connection to retrieve the row ID of.
     * @returns The row ID of the given connection.
     */
    getRowId(current: RenderedConnection): string;
    /**
     * Returns whether or not the given connection can be navigated to.
     *
     * @param current The instance to check for navigability.
     * @returns True if the given connection can be focused.
     */
    isNavigable(current: RenderedConnection): boolean;
    /**
     * Returns whether the given object can be navigated from by this policy.
     *
     * @param current The object to check if this policy applies to.
     * @returns True if the object is a RenderedConnection.
     */
    isApplicable(current: any): current is RenderedConnection;
}
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