import { ElementRef } from '@angular/core';
import * as i0 from "@angular/core";
export declare class ConstrainedNumberDirective {
    private el;
    /** decimal places to allow; if unset → integer‐only */
    precision: number | undefined;
    /** allow a leading minus? */
    allowNegative: boolean;
    /** clamp these on blur */
    min?: number;
    max?: number;
    greater?: number;
    less?: number;
    constructor(el: ElementRef<HTMLInputElement>);
    /**
     *
     * @returns RegExp
     * Builds a regular expression pattern based on the precision and constraints provided.
     * The pattern allows for optional negative sign, digits, and decimal part based on the precision.
     * The decimal part is optional and can have a maximum number of digits defined by the precision.
     * The pattern is used to validate the input value in the onKeydown and onPaste methods.
     */
    private buildPattern;
    /**
     *
     * @param e KeyboardEvent
     * Handles keydown events on the input element. It prevents invalid keystrokes based on the defined pattern.
     * The method allows navigation keys, backspace, delete, and copy/paste operations.
     * It checks if the new value after the keystroke matches the pattern. If not, it prevents the default action.
     * @returns
     */
    onKeydown(e: KeyboardEvent): void;
    /**
     *
     * @param e ClipboardEvent
     * Handles paste events on the input element. It prevents pasting invalid values based on the defined pattern.
     * The method checks if the pasted value, when combined with the current value of the input, matches the pattern.
     * If not, it prevents the paste action.
     *
     */
    onPaste(e: ClipboardEvent): void;
    /**
     * Handles blur events on the input element. It validates the input value and clamps it within the defined min/max range.
     * It also ensures that the value is greater than the defined greater constraint and less than the defined less constraint.
     * If the value is NaN or doesn't meet the constraints, it sets the input value to an empty string.
     * * The method is called when the input loses focus, ensuring that the value is valid before further processing.
     * @returns void
     */
    onBlur(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<ConstrainedNumberDirective, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<ConstrainedNumberDirective, "[appConstrainedNumber]", never, { "precision": { "alias": "precision"; "required": false; }; "allowNegative": { "alias": "allowNegative"; "required": false; }; "min": { "alias": "min"; "required": false; }; "max": { "alias": "max"; "required": false; }; "greater": { "alias": "greater"; "required": false; }; "less": { "alias": "less"; "required": false; }; }, {}, never, never, false, never>;
}