<script lang="ts" setup>
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import type { CSSProperties } from 'vue';
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import type { CropperProps } from './typing';
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import { computed, onMounted, onUnmounted, ref, unref, useAttrs } from 'vue';
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import { useDebounceFn } from '@vueuse/core';
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import Cropper from 'cropperjs';
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import { defaultOptions } from './typing';
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import 'cropperjs/dist/cropper.css';
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defineOptions({ name: 'CropperImage' });
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const props = withDefaults(defineProps<CropperProps>(), {
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src: '',
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alt: '',
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circled: false,
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realTimePreview: true,
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height: '360px',
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crossorigin: undefined,
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imageStyle: () => ({}),
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options: () => ({}),
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});
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const emit = defineEmits(['cropend', 'ready', 'cropendError']);
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const attrs = useAttrs();
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type ElRef<T extends HTMLElement = HTMLDivElement> = null | T;
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const imgElRef = ref<ElRef<HTMLImageElement>>();
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const cropper = ref<Cropper | null>();
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const isReady = ref(false);
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const debounceRealTimeCropped = useDebounceFn(realTimeCropped, 80);
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const getImageStyle = computed((): CSSProperties => {
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return {
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height: props.height,
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maxWidth: '100%',
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...props.imageStyle,
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};
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});
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const getClass = computed(() => {
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return [
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attrs.class,
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{
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'cropper-image--circled': props.circled,
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},
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];
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});
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const getWrapperStyle = computed((): CSSProperties => {
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return { height: `${`${props.height}`.replace(/px/, '')}px` };
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});
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onMounted(init);
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onUnmounted(() => {
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cropper.value?.destroy();
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});
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async function init() {
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const imgEl = unref(imgElRef);
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if (!imgEl) {
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return;
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}
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cropper.value = new Cropper(imgEl, {
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...defaultOptions,
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ready: () => {
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isReady.value = true;
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realTimeCropped();
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emit('ready', cropper.value);
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},
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crop() {
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debounceRealTimeCropped();
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},
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zoom() {
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debounceRealTimeCropped();
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},
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cropmove() {
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debounceRealTimeCropped();
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},
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...props.options,
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});
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}
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// Real-time display preview
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function realTimeCropped() {
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props.realTimePreview && cropped();
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}
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// event: return base64 and width and height information after cropping
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function cropped() {
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if (!cropper.value) {
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return;
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}
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const imgInfo = cropper.value.getData();
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const canvas = props.circled
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? getRoundedCanvas()
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: cropper.value.getCroppedCanvas();
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canvas.toBlob((blob) => {
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if (!blob) {
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return;
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}
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const fileReader: FileReader = new FileReader();
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fileReader.readAsDataURL(blob);
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fileReader.onloadend = (e) => {
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emit('cropend', {
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imgBase64: e.target?.result ?? '',
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imgInfo,
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});
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};
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fileReader.addEventListener('error', () => {
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emit('cropendError');
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});
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}, 'image/png');
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}
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// Get a circular picture canvas
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function getRoundedCanvas() {
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const sourceCanvas = cropper.value!.getCroppedCanvas();
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const canvas = document.createElement('canvas');
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const context = canvas.getContext('2d')!;
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const width = sourceCanvas.width;
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const height = sourceCanvas.height;
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canvas.width = width;
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canvas.height = height;
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context.imageSmoothingEnabled = true;
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context.drawImage(sourceCanvas, 0, 0, width, height);
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context.globalCompositeOperation = 'destination-in';
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context.beginPath();
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context.arc(
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width / 2,
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height / 2,
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Math.min(width, height) / 2,
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0,
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2 * Math.PI,
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true,
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);
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context.fill();
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return canvas;
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}
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function handleImageError() {
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emit('cropendError');
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}
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</script>
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<template>
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<div :class="getClass" :style="getWrapperStyle">
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<img
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v-show="isReady"
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ref="imgElRef"
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:alt="alt"
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:crossorigin="crossorigin"
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:src="src"
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:style="getImageStyle"
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@error="handleImageError"
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class="h-auto max-w-full"
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/>
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</div>
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</template>
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<style lang="scss">
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.cropper-image {
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&--circled {
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.cropper-view-box,
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.cropper-face {
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border-radius: 50%;
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}
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}
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}
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</style>
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