update 优化 工作流预览界面支持放大/缩放 移动拖拽

src/components/Process/approvalRecord.vue

@@ -2,8 +2,21 @@
   <div class="container">
     <el-dialog v-model="visible" draggable title="审批记录" :width="props.width" :height="props.height" :close-on-click-modal="false">
       <el-tabs v-model="tabActiveName" class="demo-tabs">
-        <el-tab-pane v-loading="loading" label="流程图" name="bpmn">
-          <img :src="imgUrl" width="100%" style="margin: 0 auto" />
+        <el-tab-pane v-loading="loading" label="流程图" name="image">
+          <div
+            ref="imageWrapperRef"
+            class="image-wrapper"
+            @wheel="handleMouseWheel"
+            @mousedown="handleMouseDown"
+            @mousemove="handleMouseMove"
+            @mouseup="handleMouseUp"
+            @mouseleave="handleMouseLeave"
+            @dblclick="resetTransform"
+            :style="transformStyle"
+          >
+            <el-image :src="imgUrl" class="scalable-image" />
+          </div>
+<!--          <img :src="imgUrl" width="100%" style="margin: 0 auto" />-->
         </el-tab-pane>
         <el-tab-pane v-loading="loading" label="审批信息" name="info">
           <div>
@@ -72,14 +85,14 @@ const props = defineProps({
 const loading = ref(false);
 const visible = ref(false);
 const historyList = ref<Array<any>>([]);
-const tabActiveName = ref('bpmn');
+const tabActiveName = ref('image');
 const imgUrl = ref('');
 
 //初始化查询审批记录
 const init = async (businessId: string | number) => {
   visible.value = true;
   loading.value = true;
-  tabActiveName.value = 'bpmn';
+  tabActiveName.value = 'image';
   historyList.value = [];
   flowImage(businessId).then((resp) => {
     if (resp.data) {
@@ -109,6 +122,111 @@ const getIds = async (ids: string | number) => {
 const handleDownload = (ossId: string) => {
   proxy?.$download.oss(ossId);
 };
+
+const imageWrapperRef = ref<HTMLElement | null>(null);
+const scale = ref(1); // 初始缩放比例
+const maxScale = 3; // 最大缩放比例
+const minScale = 0.5; // 最小缩放比例
+
+let isDragging = false;
+let startX = 0;
+let startY = 0;
+let currentTranslateX = 0;
+let currentTranslateY = 0;
+
+const handleMouseWheel = (event: WheelEvent) => {
+  event.preventDefault();
+  let newScale = scale.value - event.deltaY / 1000;
+  newScale = Math.max(minScale, Math.min(newScale, maxScale));
+  if (newScale !== scale.value) {
+    scale.value = newScale;
+    resetDragPosition(); // 重置拖拽位置，使图片居中
+  }
+};
+
+const handleMouseDown = (event: MouseEvent) => {
+  if (scale.value > 1) {
+    event.preventDefault(); // 阻止默认行为，防止拖拽
+    isDragging = true;
+    startX = event.clientX;
+    startY = event.clientY;
+  }
+};
+
+const handleMouseMove = (event: MouseEvent) => {
+  if (!isDragging || !imageWrapperRef.value) return;
+
+  const deltaX = event.clientX - startX;
+  const deltaY = event.clientY - startY;
+  startX = event.clientX;
+  startY = event.clientY;
+
+  currentTranslateX += deltaX;
+  currentTranslateY += deltaY;
+
+  // 边界检测，防止图片被拖出容器
+  const bounds = getBounds();
+  if (currentTranslateX > bounds.maxTranslateX) {
+    currentTranslateX = bounds.maxTranslateX;
+  } else if (currentTranslateX < bounds.minTranslateX) {
+    currentTranslateX = bounds.minTranslateX;
+  }
+
+  if (currentTranslateY > bounds.maxTranslateY) {
+    currentTranslateY = bounds.maxTranslateY;
+  } else if (currentTranslateY < bounds.minTranslateY) {
+    currentTranslateY = bounds.minTranslateY;
+  }
+
+  applyTransform();
+};
+
+const handleMouseUp = () => {
+  isDragging = false;
+};
+
+const handleMouseLeave = () => {
+  isDragging = false;
+};
+
+const resetTransform = () => {
+  scale.value = 1;
+  currentTranslateX = 0;
+  currentTranslateY = 0;
+  applyTransform();
+};
+
+const resetDragPosition = () => {
+  currentTranslateX = 0;
+  currentTranslateY = 0;
+  applyTransform();
+};
+
+const applyTransform = () => {
+  if (imageWrapperRef.value) {
+    imageWrapperRef.value.style.transform = `translate(${currentTranslateX}px, ${currentTranslateY}px) scale(${scale.value})`;
+  }
+};
+
+const getBounds = () => {
+  if (!imageWrapperRef.value) return { minTranslateX: 0, maxTranslateX: 0, minTranslateY: 0, maxTranslateY: 0 };
+
+  const imgRect = imageWrapperRef.value.getBoundingClientRect();
+  const containerRect = imageWrapperRef.value.parentElement?.getBoundingClientRect() ?? imgRect;
+
+  const minTranslateX = (containerRect.width - imgRect.width * scale.value) / 2;
+  const maxTranslateX = -(containerRect.width - imgRect.width * scale.value) / 2;
+  const minTranslateY = (containerRect.height - imgRect.height * scale.value) / 2;
+  const maxTranslateY = -(containerRect.height - imgRect.height * scale.value) / 2;
+
+  return { minTranslateX, maxTranslateX, minTranslateY, maxTranslateY };
+};
+
+const transformStyle = computed(() => ({
+  transition: isDragging ? 'none' : 'transform 0.2s ease',
+}));
+
+
 /**
  * 对外暴露子组件方法
  */
@@ -137,4 +255,25 @@ defineExpose({
     min-height: calc(100vh - 170px) !important;
   }
 }
+
+.image-wrapper {
+  width: 100%;
+  height: 100%;
+  overflow: hidden;
+  position: relative;
+  margin: 0 auto;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  user-select: none; /* 禁用文本选择 */
+  cursor: grab; /* 设置初始鼠标指针为可拖动 */
+}
+
+.image-wrapper:active {
+  cursor: grabbing; /* 当正在拖动时改变鼠标指针 */
+}
+
+.scalable-image {
+  width: 100%;
+}
 </style>