import * as spec from '@galacean/effects-specification';
import type { Engine } from '../../engine';
import type { Material } from '../../material';
import type { ItemRenderer } from '../../components';
import type { VFXItem } from '../../vfx-item';
import type { BaseLayout } from './base-layout';
import type { TextStyle } from './text-style';
/**
 * 纯文本组件特有 API
 */
export interface ITextComponent {
    setOutlineWidth(value: number): void;
    setOutlineEnabled(value: boolean): void;
    setShadowBlur(value: number): void;
    setShadowColor(value: spec.RGBAColorValue): void;
    setShadowOffsetX(value: number): void;
    setShadowOffsetY(value: number): void;
    setAutoWidth(value: boolean): void;
    setFontSize(value: number): void;
}
/**
 * 富文本组件特有 API
 */
export interface IRichTextComponent extends ITextComponent {
}
export declare class TextComponentBase {
    textStyle: TextStyle;
    textLayout: BaseLayout;
    text: string;
    canvas: HTMLCanvasElement;
    context: CanvasRenderingContext2D | null;
    isDirty: boolean;
    engine: Engine;
    material: Material;
    item: VFXItem;
    renderer: ItemRenderer;
    lineCount: number;
    protected maxLineWidth: number;
    protected readonly ALPHA_FIX_VALUE: number;
    setText(value: string): void;
    setTextAlign(value: spec.TextAlignment): void;
    setTextVerticalAlign(value: spec.TextVerticalAlign): void;
    /**
     * @deprecated 2.8.0 本方法已废弃，请使用 setTextVerticalAlign 替代。
     */
    setTextBaseline(value: spec.TextBaseline): void;
    setTextColor(value: spec.RGBAColorValue): void;
    setFontFamily(value: string): void;
    setFontWeight(value: spec.TextWeight): void;
    setFontStyle(value: spec.FontStyle): void;
    setOutlineColor(value: spec.RGBAColorValue): void;
    setOutlineEnabled(value: boolean): void;
    setFontScale(value: number): void;
    setOverflow(overflow: spec.TextOverflow): void;
    protected getFontDesc(size?: number): string;
    protected setupOutline(): void;
    protected setupShadow(): void;
    protected disposeTextTexture(): void;
    /**
     * 通用纹理渲染辅助方法
     */
    protected renderToTexture(width: number, height: number, flipY: boolean, drawCallback: (ctx: CanvasRenderingContext2D) => void, options?: {
        disposeOld?: boolean;
    }): void;
    protected initTextBase(engine: Engine): void;
}