import type { Vec2, Color } from '../core/types';
import { EventBus } from '../core/EventBus';
export type UIAnchor = 'top-left' | 'top-center' | 'top-right' | 'center-left' | 'center' | 'center-right' | 'bottom-left' | 'bottom-center' | 'bottom-right';
export type UIElementType = 'text' | 'bar' | 'image' | 'panel' | 'button' | 'container';
export interface UIStyle {
    fontSize?: number;
    fontFamily?: string;
    color?: Color;
    backgroundColor?: Color;
    borderColor?: Color;
    borderWidth?: number;
    borderRadius?: number;
    padding?: number;
    opacity?: number;
    visible?: boolean;
}
export interface UIElement {
    id: string;
    type: UIElementType;
    /** Position relative to anchor (px). */
    position: Vec2;
    anchor: UIAnchor;
    size: {
        width: number;
        height: number;
    };
    style: UIStyle;
    /** For text/button elements. */
    text?: string;
    /** For bar elements (0-1). */
    value?: number;
    /** For image elements. */
    imageId?: string;
    /** Children for container type. */
    children?: string[];
    /** Whether this element can receive focus. */
    focusable?: boolean;
    /** Callback action name for button click/select. */
    action?: string;
    /** Custom data. */
    data?: Record<string, unknown>;
    enabled: boolean;
    visible: boolean;
}
export interface UITheme {
    name: string;
    fontFamily: string;
    fontSize: number;
    textColor: Color;
    panelColor: Color;
    panelBorder: Color;
    accentColor: Color;
    focusColor: Color;
    disabledColor: Color;
    buttonColor: Color;
    buttonHoverColor: Color;
    barFillColor: Color;
    barBgColor: Color;
}
export declare class GameUI {
    readonly events: EventBus;
    private elements;
    private layers;
    private _theme;
    private _focusedId;
    private _focusOrder;
    private _screenSize;
    get theme(): Readonly<UITheme>;
    set theme(t: Partial<UITheme>);
    get focusedElement(): string | null;
    setScreenSize(w: number, h: number): void;
    addElement(el: UIElement, layerIndex?: number): void;
    removeElement(id: string): void;
    getElement(id: string): UIElement | undefined;
    clear(): void;
    focusNext(): void;
    focusPrev(): void;
    setFocus(id: string | null): void;
    /** Activate (select/click) the currently focused element. */
    activateFocused(): void;
    createText(id: string, text: string, anchor?: UIAnchor, pos?: Vec2, style?: Partial<UIStyle>): UIElement;
    createBar(id: string, value: number, anchor?: UIAnchor, pos?: Vec2, size?: {
        width: number;
        height: number;
    }): UIElement;
    createButton(id: string, text: string, action: string, anchor?: UIAnchor, pos?: Vec2): UIElement;
    createPanel(id: string, anchor?: UIAnchor, pos?: Vec2, size?: {
        width: number;
        height: number;
    }): UIElement;
    render(ctx: CanvasRenderingContext2D): void;
    private renderText;
    private renderBar;
    private renderButton;
    private renderPanel;
    private resolveAnchorPosition;
}