mirror of
https://gitee.com/ant-design/ant-design.git
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297 lines
7.9 KiB
TypeScript
297 lines
7.9 KiB
TypeScript
import React, { useEffect } from 'react';
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import { useMutateObserver } from '@rc-component/mutate-observer';
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import classNames from 'classnames';
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import { useToken } from '../theme/internal';
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import WatermarkContext from './context';
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import type { WatermarkContextProps } from './context';
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import useClips, { FontGap } from './useClips';
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import useRafDebounce from './useRafDebounce';
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import useWatermark from './useWatermark';
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import { getPixelRatio, reRendering } from './utils';
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export interface WatermarkProps {
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zIndex?: number;
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rotate?: number;
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width?: number;
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height?: number;
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image?: string;
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content?: string | string[];
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font?: {
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color?: CanvasFillStrokeStyles['fillStyle'];
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fontSize?: number | string;
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fontWeight?: 'normal' | 'light' | 'weight' | number;
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fontStyle?: 'none' | 'normal' | 'italic' | 'oblique';
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fontFamily?: string;
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textAlign?: CanvasTextAlign;
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};
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style?: React.CSSProperties;
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className?: string;
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rootClassName?: string;
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gap?: [number, number];
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offset?: [number, number];
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children?: React.ReactNode;
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inherit?: boolean;
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}
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/**
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* Only return `next` when size changed.
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* This is only used for elements compare, not a shallow equal!
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*/
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function getSizeDiff<T>(prev: Set<T>, next: Set<T>) {
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return prev.size === next.size ? prev : next;
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}
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const DEFAULT_GAP_X = 100;
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const DEFAULT_GAP_Y = 100;
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const Watermark: React.FC<WatermarkProps> = (props) => {
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const {
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/**
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* The antd content layer zIndex is basically below 10
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* https://github.com/ant-design/ant-design/blob/6192403b2ce517c017f9e58a32d58774921c10cd/components/style/themes/default.less#L335
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*/
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zIndex = 9,
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rotate = -22,
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width,
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height,
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image,
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content,
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font = {},
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style,
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className,
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rootClassName,
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gap = [DEFAULT_GAP_X, DEFAULT_GAP_Y],
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offset,
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children,
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inherit = true,
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} = props;
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const [, token] = useToken();
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const {
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color = token.colorFill,
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fontSize = token.fontSizeLG,
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fontWeight = 'normal',
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fontStyle = 'normal',
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fontFamily = 'sans-serif',
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textAlign = 'center',
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} = font;
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const [gapX = DEFAULT_GAP_X, gapY = DEFAULT_GAP_Y] = gap;
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const gapXCenter = gapX / 2;
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const gapYCenter = gapY / 2;
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const offsetLeft = offset?.[0] ?? gapXCenter;
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const offsetTop = offset?.[1] ?? gapYCenter;
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const markStyle = React.useMemo(() => {
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const mergedStyle: React.CSSProperties = {
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zIndex,
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position: 'absolute',
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left: 0,
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top: 0,
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width: '100%',
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height: '100%',
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pointerEvents: 'none',
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backgroundRepeat: 'repeat',
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};
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/** Calculate the style of the offset */
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let positionLeft = offsetLeft - gapXCenter;
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let positionTop = offsetTop - gapYCenter;
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if (positionLeft > 0) {
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mergedStyle.left = `${positionLeft}px`;
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mergedStyle.width = `calc(100% - ${positionLeft}px)`;
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positionLeft = 0;
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}
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if (positionTop > 0) {
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mergedStyle.top = `${positionTop}px`;
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mergedStyle.height = `calc(100% - ${positionTop}px)`;
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positionTop = 0;
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}
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mergedStyle.backgroundPosition = `${positionLeft}px ${positionTop}px`;
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return mergedStyle;
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}, [zIndex, offsetLeft, gapXCenter, offsetTop, gapYCenter]);
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const [container, setContainer] = React.useState<HTMLDivElement | null>();
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// Used for nest case like Modal, Drawer
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const [subElements, setSubElements] = React.useState(new Set<HTMLElement>());
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// Nest elements should also support watermark
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const targetElements = React.useMemo(() => {
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const list = container ? [container] : [];
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return [...list, ...Array.from(subElements)];
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}, [container, subElements]);
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// ============================ Content =============================
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/**
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* Get the width and height of the watermark. The default values are as follows
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* Image: [120, 64]; Content: It's calculated by content;
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*/
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const getMarkSize = (ctx: CanvasRenderingContext2D) => {
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let defaultWidth = 120;
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let defaultHeight = 64;
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if (!image && ctx.measureText) {
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ctx.font = `${Number(fontSize)}px ${fontFamily}`;
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const contents = Array.isArray(content) ? content : [content];
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const sizes = contents.map((item) => {
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const metrics = ctx.measureText(item!);
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return [metrics.width, metrics.fontBoundingBoxAscent + metrics.fontBoundingBoxDescent];
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});
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defaultWidth = Math.ceil(Math.max(...sizes.map((size) => size[0])));
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defaultHeight =
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Math.ceil(Math.max(...sizes.map((size) => size[1]))) * contents.length +
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(contents.length - 1) * FontGap;
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}
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return [width ?? defaultWidth, height ?? defaultHeight] as const;
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};
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const getClips = useClips();
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const [watermarkInfo, setWatermarkInfo] = React.useState<[base64: string, contentWidth: number]>(
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null!,
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);
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// Generate new Watermark content
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const renderWatermark = () => {
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const canvas = document.createElement('canvas');
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const ctx = canvas.getContext('2d');
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if (ctx) {
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const ratio = getPixelRatio();
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const [markWidth, markHeight] = getMarkSize(ctx);
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const drawCanvas = (
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drawContent?: NonNullable<WatermarkProps['content']> | HTMLImageElement,
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) => {
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const [nextClips, clipWidth] = getClips(
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drawContent || '',
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rotate,
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ratio,
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markWidth,
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markHeight,
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{
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color,
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fontSize,
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fontStyle,
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fontWeight,
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fontFamily,
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textAlign,
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},
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gapX,
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gapY,
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);
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setWatermarkInfo([nextClips, clipWidth]);
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};
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if (image) {
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const img = new Image();
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img.onload = () => {
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drawCanvas(img);
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};
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img.onerror = () => {
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drawCanvas(content);
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};
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img.crossOrigin = 'anonymous';
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img.referrerPolicy = 'no-referrer';
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img.src = image;
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} else {
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drawCanvas(content);
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}
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}
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};
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const syncWatermark = useRafDebounce(renderWatermark);
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// ============================= Effect =============================
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// Append watermark to the container
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const [appendWatermark, removeWatermark, isWatermarkEle] = useWatermark(markStyle);
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useEffect(() => {
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if (watermarkInfo) {
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targetElements.forEach((holder) => {
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appendWatermark(watermarkInfo[0], watermarkInfo[1], holder);
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});
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}
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}, [watermarkInfo, targetElements]);
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// ============================ Observe =============================
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const onMutate = (mutations: MutationRecord[]) => {
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mutations.forEach((mutation) => {
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if (reRendering(mutation, isWatermarkEle)) {
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syncWatermark();
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}
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});
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};
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useMutateObserver(targetElements, onMutate);
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useEffect(syncWatermark, [
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rotate,
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zIndex,
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width,
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height,
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image,
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content,
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color,
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fontSize,
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fontWeight,
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fontStyle,
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fontFamily,
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textAlign,
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gapX,
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gapY,
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offsetLeft,
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offsetTop,
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]);
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// ============================ Context =============================
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const watermarkContext = React.useMemo<WatermarkContextProps>(
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() => ({
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add: (ele) => {
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setSubElements((prev) => {
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const clone = new Set(prev);
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clone.add(ele);
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return getSizeDiff(prev, clone);
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});
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},
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remove: (ele) => {
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removeWatermark(ele);
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setSubElements((prev) => {
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const clone = new Set(prev);
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clone.delete(ele);
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return getSizeDiff(prev, clone);
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});
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},
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}),
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[],
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);
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// ============================= Render =============================
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const childNode = inherit ? (
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<WatermarkContext.Provider value={watermarkContext}>{children}</WatermarkContext.Provider>
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) : (
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children
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);
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return (
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<div
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ref={setContainer}
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className={classNames(className, rootClassName)}
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style={{ position: 'relative', ...style }}
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>
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{childNode}
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</div>
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);
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};
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if (process.env.NODE_ENV !== 'production') {
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Watermark.displayName = 'Watermark';
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}
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export default Watermark;
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