export declare function useFocus(data: any, previewRef: any, callback: any): {
    blockMousedown: (e: any, block: any, index: any) => void;
    containerMousedown: () => void;
    focusData: import("vue").ComputedRef<{
        focus: any[];
        unfocused: any[];
    }>;
    lastSelectBlock: import("vue").ComputedRef<any>;
    clearBlockFocus: () => void;
};