255 lines
8.9 KiB
Vue
255 lines
8.9 KiB
Vue
import type { ExtractPropTypes, CSSProperties } from 'vue';
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import { computed, defineComponent, onBeforeUnmount, onMounted, shallowRef, watch } from 'vue';
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import { getStyleStr, getPixelRatio, rotateWatermark, reRendering } from './utils';
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import { arrayType, objectType, someType, withInstall } from '../_util/type';
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import { useMutationObserver } from '../_util/hooks/_vueuse/useMutationObserver';
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import { initDefaultProps } from '../_util/props-util';
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/**
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* Base size of the canvas, 1 for parallel layout and 2 for alternate layout
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* Only alternate layout is currently supported
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*/
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const BaseSize = 2;
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const FontGap = 3;
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export interface WatermarkFontType {
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color?: string;
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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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}
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export const 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: someType<string | string[]>([String, Array]),
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font: objectType<WatermarkFontType>(),
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rootClassName: String,
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gap: arrayType<[number, number]>(),
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offset: arrayType<[number, number]>(),
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});
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export type WatermarkProps = Partial<ExtractPropTypes<ReturnType<typeof watermarkProps>>>;
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const Watermark = defineComponent({
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name: 'AWatermark',
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inheritAttrs: false,
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props: initDefaultProps(watermarkProps(), {
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zIndex: 9,
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rotate: -22,
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font: {},
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gap: [100, 100],
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}),
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setup(props, { slots, attrs }) {
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const containerRef = shallowRef<HTMLDivElement>();
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const watermarkRef = shallowRef<HTMLDivElement>();
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const stopObservation = shallowRef(false);
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const gapX = computed(() => props.gap?.[0] ?? 100);
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const gapY = computed(() => props.gap?.[1] ?? 100);
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const gapXCenter = computed(() => gapX.value / 2);
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const gapYCenter = computed(() => gapY.value / 2);
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const offsetLeft = computed(() => props.offset?.[0] ?? gapXCenter.value);
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const offsetTop = computed(() => props.offset?.[1] ?? gapYCenter.value);
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const fontSize = computed(() => props.font?.fontSize ?? 16);
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const fontWeight = computed(() => props.font?.fontWeight ?? 'normal');
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const fontStyle = computed(() => props.font?.fontStyle ?? 'normal');
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const fontFamily = computed(() => props.font?.fontFamily ?? 'sans-serif');
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const color = computed(() => props.font?.color ?? 'rgba(0, 0, 0, 0.15)');
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const markStyle = computed(() => {
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const markStyle: CSSProperties = {
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zIndex: props.zIndex ?? 9,
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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.value - gapXCenter.value;
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let positionTop = offsetTop.value - gapYCenter.value;
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if (positionLeft > 0) {
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markStyle.left = `${positionLeft}px`;
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markStyle.width = `calc(100% - ${positionLeft}px)`;
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positionLeft = 0;
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}
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if (positionTop > 0) {
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markStyle.top = `${positionTop}px`;
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markStyle.height = `calc(100% - ${positionTop}px)`;
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positionTop = 0;
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}
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markStyle.backgroundPosition = `${positionLeft}px ${positionTop}px`;
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return markStyle;
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});
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const destroyWatermark = () => {
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if (watermarkRef.value) {
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watermarkRef.value.remove();
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watermarkRef.value = undefined;
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}
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};
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const appendWatermark = (base64Url: string, markWidth: number) => {
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if (containerRef.value && watermarkRef.value) {
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stopObservation.value = true;
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watermarkRef.value.setAttribute(
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'style',
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getStyleStr({
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...markStyle.value,
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backgroundImage: `url('${base64Url}')`,
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backgroundSize: `${(gapX.value + markWidth) * BaseSize}px`,
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}),
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);
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containerRef.value?.append(watermarkRef.value);
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// Delayed execution
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setTimeout(() => {
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stopObservation.value = false;
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});
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}
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};
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/**
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* Get the width and height of the watermark. The default values are as follows
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* Image: [120, 64]; Content: It's calculated by content;
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*/
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const getMarkSize = (ctx: CanvasRenderingContext2D) => {
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let defaultWidth = 120;
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let defaultHeight = 64;
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const content = props.content;
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const image = props.image;
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const width = props.width;
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const height = props.height;
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if (!image && ctx.measureText) {
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ctx.font = `${Number(fontSize.value)}px ${fontFamily.value}`;
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const contents = Array.isArray(content) ? content : [content];
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const widths = contents.map(item => ctx.measureText(item!).width);
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defaultWidth = Math.ceil(Math.max(...widths));
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defaultHeight = Number(fontSize.value) * contents.length + (contents.length - 1) * FontGap;
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}
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return [width ?? defaultWidth, height ?? defaultHeight] as const;
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};
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const fillTexts = (
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ctx: CanvasRenderingContext2D,
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drawX: number,
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drawY: number,
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drawWidth: number,
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drawHeight: number,
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) => {
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const ratio = getPixelRatio();
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const content = props.content;
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const mergedFontSize = Number(fontSize.value) * ratio;
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ctx.font = `${fontStyle.value} normal ${fontWeight.value} ${mergedFontSize}px/${drawHeight}px ${fontFamily.value}`;
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ctx.fillStyle = color.value;
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ctx.textAlign = 'center';
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ctx.textBaseline = 'top';
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ctx.translate(drawWidth / 2, 0);
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const contents = Array.isArray(content) ? content : [content];
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contents?.forEach((item, index) => {
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ctx.fillText(item ?? '', drawX, drawY + index * (mergedFontSize + FontGap * ratio));
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});
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};
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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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const image = props.image;
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const rotate = props.rotate ?? -22;
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if (ctx) {
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if (!watermarkRef.value) {
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watermarkRef.value = document.createElement('div');
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}
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const ratio = getPixelRatio();
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const [markWidth, markHeight] = getMarkSize(ctx);
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const canvasWidth = (gapX.value + markWidth) * ratio;
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const canvasHeight = (gapY.value + markHeight) * ratio;
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canvas.setAttribute('width', `${canvasWidth * BaseSize}px`);
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canvas.setAttribute('height', `${canvasHeight * BaseSize}px`);
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const drawX = (gapX.value * ratio) / 2;
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const drawY = (gapY.value * ratio) / 2;
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const drawWidth = markWidth * ratio;
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const drawHeight = markHeight * ratio;
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const rotateX = (drawWidth + gapX.value * ratio) / 2;
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const rotateY = (drawHeight + gapY.value * ratio) / 2;
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/** Alternate drawing parameters */
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const alternateDrawX = drawX + canvasWidth;
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const alternateDrawY = drawY + canvasHeight;
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const alternateRotateX = rotateX + canvasWidth;
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const alternateRotateY = rotateY + canvasHeight;
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ctx.save();
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rotateWatermark(ctx, rotateX, rotateY, rotate);
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if (image) {
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const img = new Image();
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img.onload = () => {
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ctx.drawImage(img, drawX, drawY, drawWidth, drawHeight);
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/** Draw interleaved pictures after rotation */
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ctx.restore();
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rotateWatermark(ctx, alternateRotateX, alternateRotateY, rotate);
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ctx.drawImage(img, alternateDrawX, alternateDrawY, drawWidth, drawHeight);
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appendWatermark(canvas.toDataURL(), markWidth);
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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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fillTexts(ctx, drawX, drawY, drawWidth, drawHeight);
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/** Fill the interleaved text after rotation */
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ctx.restore();
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rotateWatermark(ctx, alternateRotateX, alternateRotateY, rotate);
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fillTexts(ctx, alternateDrawX, alternateDrawY, drawWidth, drawHeight);
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appendWatermark(canvas.toDataURL(), markWidth);
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}
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}
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};
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onMounted(() => {
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renderWatermark();
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});
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watch(
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() => props,
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() => {
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renderWatermark();
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},
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{
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deep: true,
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flush: 'post',
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},
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);
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onBeforeUnmount(() => {
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destroyWatermark();
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});
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const onMutate = (mutations: MutationRecord[]) => {
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if (stopObservation.value) {
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return;
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}
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mutations.forEach(mutation => {
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if (reRendering(mutation, watermarkRef.value)) {
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destroyWatermark();
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renderWatermark();
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}
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});
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};
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useMutationObserver(containerRef, onMutate, {
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attributes: true,
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});
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return () => {
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return (
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<div
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{...attrs}
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ref={containerRef}
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class={[attrs.class, props.rootClassName]}
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style={[{ position: 'relative' }, attrs.style as CSSProperties]}
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>
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{slots.default?.()}
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</div>
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);
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};
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},
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});
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export default withInstall(Watermark);
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