155 lines
4.0 KiB
Vue
155 lines
4.0 KiB
Vue
<template>
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<div
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ref="imageWrapperRef"
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class="image-wrapper"
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@wheel="handleMouseWheel"
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@mousedown="handleMouseDown"
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@mousemove="handleMouseMove"
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@mouseup="handleMouseUp"
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@mouseleave="handleMouseLeave"
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@dblclick="resetTransform"
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:style="transformStyle"
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>
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<el-card class="box-card">
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<el-image :src="props.imgUrl" class="scalable-image" />
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</el-card>
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</div>
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</template>
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<script setup lang="ts">
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// Props 定义方式变化
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const props = defineProps({
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imgUrl: {
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type: String,
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default: () => ''
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}
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});
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const imageWrapperRef = ref<HTMLElement | null>(null);
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const scale = ref(1); // 初始缩放比例
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const maxScale = 3; // 最大缩放比例
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const minScale = 0.5; // 最小缩放比例
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let isDragging = false;
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let startX = 0;
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let startY = 0;
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let currentTranslateX = 0;
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let currentTranslateY = 0;
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const handleMouseWheel = (event: WheelEvent) => {
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event.preventDefault();
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let newScale = scale.value - event.deltaY / 1000;
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newScale = Math.max(minScale, Math.min(newScale, maxScale));
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if (newScale !== scale.value) {
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scale.value = newScale;
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resetDragPosition(); // 重置拖拽位置，使图片居中
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}
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};
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const handleMouseDown = (event: MouseEvent) => {
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if (scale.value > 1) {
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event.preventDefault(); // 阻止默认行为，防止拖拽
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isDragging = true;
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startX = event.clientX;
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startY = event.clientY;
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}
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};
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const handleMouseMove = (event: MouseEvent) => {
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if (!isDragging || !imageWrapperRef.value) return;
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const deltaX = event.clientX - startX;
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const deltaY = event.clientY - startY;
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startX = event.clientX;
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startY = event.clientY;
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currentTranslateX += deltaX;
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currentTranslateY += deltaY;
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// 边界检测，防止图片被拖出容器
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const bounds = getBounds();
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if (currentTranslateX > bounds.maxTranslateX) {
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currentTranslateX = bounds.maxTranslateX;
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} else if (currentTranslateX < bounds.minTranslateX) {
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currentTranslateX = bounds.minTranslateX;
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}
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if (currentTranslateY > bounds.maxTranslateY) {
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currentTranslateY = bounds.maxTranslateY;
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} else if (currentTranslateY < bounds.minTranslateY) {
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currentTranslateY = bounds.minTranslateY;
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}
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applyTransform();
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};
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const handleMouseUp = () => {
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isDragging = false;
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};
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const handleMouseLeave = () => {
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isDragging = false;
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};
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const resetTransform = () => {
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scale.value = 1;
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currentTranslateX = 0;
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currentTranslateY = 0;
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applyTransform();
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};
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const resetDragPosition = () => {
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currentTranslateX = 0;
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currentTranslateY = 0;
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applyTransform();
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};
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const applyTransform = () => {
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if (imageWrapperRef.value) {
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imageWrapperRef.value.style.transform = `translate(${currentTranslateX}px, ${currentTranslateY}px) scale(${scale.value})`;
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}
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};
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const getBounds = () => {
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if (!imageWrapperRef.value) return { minTranslateX: 0, maxTranslateX: 0, minTranslateY: 0, maxTranslateY: 0 };
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const imgRect = imageWrapperRef.value.getBoundingClientRect();
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const containerRect = imageWrapperRef.value.parentElement?.getBoundingClientRect() ?? imgRect;
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const minTranslateX = (containerRect.width - imgRect.width * scale.value) / 2;
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const maxTranslateX = -(containerRect.width - imgRect.width * scale.value) / 2;
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const minTranslateY = (containerRect.height - imgRect.height * scale.value) / 2;
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const maxTranslateY = -(containerRect.height - imgRect.height * scale.value) / 2;
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return { minTranslateX, maxTranslateX, minTranslateY, maxTranslateY };
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};
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const transformStyle = computed(() => ({
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transition: isDragging ? 'none' : 'transform 0.2s ease'
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}));
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</script>
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<style scoped>
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.image-wrapper {
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width: 100%;
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overflow: hidden;
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position: relative;
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margin: 0 auto;
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display: flex;
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justify-content: center;
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align-items: center;
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user-select: none; /* 禁用文本选择 */
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cursor: grab; /* 设置初始鼠标指针为可拖动 */
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}
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.image-wrapper:active {
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cursor: grabbing; /* 当正在拖动时改变鼠标指针 */
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}
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.scalable-image {
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object-fit: contain;
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width: 100%;
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padding: 15px;
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}
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</style>
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