fix

@@ -16,6 +16,7 @@
       :beforeAdd="handleBeforeAdd"
       :beforeAdd="handleBeforeAdd"
       :afterAdd="handleAfterAdd"
       :afterAdd="handleAfterAdd"
       @click-canvas="onClickCanvas"
       @click-canvas="onClickCanvas"
+      @drag-canvas="onDragCanvas"
       @dragend-node="onDragEndNode"
       @dragend-node="onDragEndNode"
       @click-node="onClickNode"
       @click-node="onClickNode"
       @click-node-mousedown="onClickNodeMousedown"
       @click-node-mousedown="onClickNodeMousedown"
@@ -1091,7 +1092,6 @@ export default {
           event.returnValue = confirmationMessage; 
           event.returnValue = confirmationMessage; 
           return confirmationMessage;
           return confirmationMessage;
         }
         }
-
       });
       });
       // 监听 unload 事件
       // 监听 unload 事件
       window.addEventListener('unload', function () {
       window.addEventListener('unload', function () {
@@ -2301,6 +2301,9 @@ export default {
       editor.closeModel()
       editor.closeModel()
     }
     }
 
 
+    const onDragCanvas = (evt) => {
+    }
+
     /**
     /**
      * 拖动节点结束回调
      * 拖动节点结束回调
      *
      *
@@ -2662,6 +2665,7 @@ export default {
       showMultipleSelect: true, // 编辑器是否可以多选
       showMultipleSelect: true, // 编辑器是否可以多选
 
 
       onClickCanvas,
       onClickCanvas,
+      onDragCanvas,
       onClickNodeMousedown,
       onClickNodeMousedown,
       onClickNode,
       onClickNode,
       onClickEdge,
       onClickEdge,

@@ -60,6 +60,9 @@ export default {
                 graph.on('canvas:click', (e) => {
                 graph.on('canvas:click', (e) => {
                     context.emit('click-canvas', e)
                     context.emit('click-canvas', e)
                 })
                 })
+                graph.on('canvas:drag', (e) => {
+                    context.emit('drag-canvas', e)
+                })
                 graph.on('node:mousedown', (e) => {
                 graph.on('node:mousedown', (e) => {
                     context.emit('click-node-mousedown', e)
                     context.emit('click-node-mousedown', e)
                 })
                 })