import { EventEmitter } from "./EventEmitter";
import { IBPasteAction, IBCutAction, IBClipboardData, IBMoveInSlotAction, IBMoveBetweenSlotsAction } from "./action";
import { BlockHandler, BlockInfo } from "./BlockHandler";
import { DraggingContext } from "./DraggingContext";
import { SlotHandler, SlotInfo } from "./SlotHandler";
import { MultipleSelectType } from "./MultipleSelectType";
export interface BlockContextEvents {
    activeElementChanged(ctx: BlockContext): void;
    focus(ctx: BlockContext): void;
    blur(ctx: BlockContext): void;
    paste(action: IBPasteAction): void;
    cut(action: IBCutAction): void;
    moveInSlot(action: IBMoveInSlotAction): void;
    moveBetweenSlots(action: IBMoveBetweenSlotsAction): void;
}
export interface BlockContextOptions {
    /**
     * optional, a string to distinguish BlockContexts of different scenario usage.
     *
     * for example: "files", "workflow", "tasks", "dependencies"
     *
     * between BlockContexts with different brand, data cannot be pasted / dragged
     */
    brand?: string;
    /**
     * whether unset all active blocks & slot's `active` state when click nothing on the page
     *
     * default is true
     */
    deactivateHandlersWhenBlur?: boolean;
    /**
     * whether navigate with arrow keys when focused.
     *
     * default is true.
     *
     * Note: to add your own keyboard logic, `blockContext.hiddenInput.addEventListener("keydown", ...)`
     */
    navigateWithArrowKeys?: boolean;
    /**
     * when user press delete key, whether perform cut action without updating clipboard.
     *
     * default is true.
     *
     * Note: to add your own keyboard logic, `blockContext.hiddenInput.addEventListener("keydown", ...)`
     */
    handleDeleteKey?: boolean;
    /**
     * default is true
     */
    multipleSelect?: boolean;
    /**
     * default is `JSON.stringify(data)`
     *
     * @see {@link unserializeForClipboard}
     */
    serializeForClipboard?: (data: any) => string;
    /**
     * default is `JSON.parse(text)`
     *
     * @see {@link serializeForClipboard}
     */
    unserializeForClipboard?: (text: string) => any;
}
export declare class BlockContext extends EventEmitter<BlockContextEvents> {
    hiddenInput: HTMLTextAreaElement;
    private _lastActiveElement;
    hasFocus: boolean;
    options: Required<BlockContextOptions>;
    brand: string;
    uuid: string;
    dragging: DraggingContext;
    constructor(options?: BlockContextOptions);
    focus(): void;
    /**
     * dump all active blocks' data, then you can transfer it via file / clipboard etc,
     * and use it with {@link pasteWithData}
     *
     * this will NOT delete the selected blocks. if you want to, call {@link deleteActiveBlocks}
     *
     * @see {@link pasteWithData}
     * @returns `undefined` if cannot copy. otherwise returns text
     */
    dumpSelectedData(): IBClipboardData | undefined;
    /**
     * Focus the hidden input and write selected blocks' data to the clipboard.
     */
    copy(): void;
    /**
     * do a "pasting" action with the data exported by {@link dumpSelectedData}
     *
     * @param data
     * @param targetIndex - the insert point. if not specified, will be before the active block, of the end of current active slot.
     * @see {@link dumpSelectedData}
     */
    pasteWithData(data: any, targetIndex?: number): void;
    /**
     * Make a Cut Action and send to activeSlot.
     *
     * `cut` event will be emitted on the slot and this context.
     *
     * clipboard not affected. Call `copy` before this, if needed.
     *
     * @return `true` if action is handled and not `preventDefault`-ed
     */
    deleteActiveBlocks(): boolean;
    /**
     * Focus the hidden input and select next n-th block.
     *
     * @param n the relative number to current block. could be negative
     */
    activeNextBlock(n: number, multipleSelectMode?: boolean): void;
    /**
     * Focus the hidden input and select parent block of current block.
     */
    activeParentBlock(): void;
    /**
     * Focus the hidden input and select current block's first slot and its children.
     */
    activeChildrenBlocks(): void;
    /**
     * the current active blocks.
     *
     * WARN:
     * 1. they must be in the same slot!
     * 2. always invoke `syncActiveElementStatus` after mutating this.
     */
    activeBlocks: Set<BlockHandler>;
    slotOfActiveBlocks: SlotHandler | null;
    /**
     * the current active slot.
     *
     * WARN:
     * 1. this is NOT ALWAYS related to `activeBlocks`. See `slotOfActiveBlocks` if needed.
     * 2. always invoke `syncActiveElementStatus` after mutating this.
     */
    activeSlot: SlotHandler | null;
    private lastActiveSlot;
    private lastActiveBlocks?;
    /**
     * invoke this when `activeSlot` or `activeBlocks` are mutated!
     */
    syncActiveElementStatus(): void;
    isFocusingBlock?: BlockHandler;
    isFocusingSlot?: SlotHandler;
    focusingElement?: HTMLElement;
    /**
     * clear selection
     */
    clearSelection(): void;
    /**
     * select a block or add it to selection ( if multipleSelect is not `none`)
     *
     * note: if in multipleSelect mode, `activeSlot` will be affected
     */
    addBlockToSelection(currBlock: BlockHandler, multipleSelect?: MultipleSelectType): void;
    handleSlotPointerUp: (slot: SlotHandler, ev?: Pick<PointerEvent, "eventPhase" | "currentTarget"> | undefined) => void;
    handleBlockPointerUp: (block: BlockHandler, ev?: Pick<PointerEvent, "eventPhase" | "currentTarget"> | undefined) => void;
    handleGlobalPointerUp: (ev: PointerEvent) => void;
    dispose(): void;
    createBlock(info: BlockInfo, ownerSlot?: SlotHandler | null): BlockHandler;
    createSlot(info: SlotInfo, ownerBlock?: BlockHandler | null): SlotHandler;
}