fix: Optimize the workspace panel width calculation (#22195)

web/app/components/workflow/panel/index.tsx

@@ -77,6 +77,30 @@ const Panel: FC<PanelProps> = ({
   const isRestoring = useStore(s => s.isRestoring)
   const showWorkflowVersionHistoryPanel = useStore(s => s.showWorkflowVersionHistoryPanel)
 
+  // widths used for adaptive layout
+  const workflowCanvasWidth = useStore(s => s.workflowCanvasWidth)
+  const previewPanelWidth = useStore(s => s.previewPanelWidth)
+  const setPreviewPanelWidth = useStore(s => s.setPreviewPanelWidth)
+
+  // When a node is selected and the NodePanel appears, if the current width
+  // of preview/otherPanel is too large, it may result in the total width of
+  // the two panels exceeding the workflowCanvasWidth, causing the NodePanel
+  // to be pushed out. Here we check and, if necessary, reduce the previewPanelWidth
+  // to "workflowCanvasWidth - 400 (minimum NodePanel width) - 400 (minimum canvas space)",
+  // while still ensuring that previewPanelWidth ≥ 400.
+
+  useEffect(() => {
+    if (!selectedNode || !workflowCanvasWidth)
+      return
+
+    const reservedCanvasWidth = 400 // Reserve the minimum visible width for the canvas
+    const minNodePanelWidth = 400
+    const maxAllowed = Math.max(workflowCanvasWidth - reservedCanvasWidth - minNodePanelWidth, 400)
+
+    if (previewPanelWidth > maxAllowed)
+      setPreviewPanelWidth(maxAllowed)
+  }, [selectedNode, workflowCanvasWidth, previewPanelWidth, setPreviewPanelWidth])
+
   const setRightPanelWidth = useStore(s => s.setRightPanelWidth)
   const setOtherPanelWidth = useStore(s => s.setOtherPanelWidth)
 

web/app/components/workflow/panel/workflow-preview.tsx

@@ -32,6 +32,9 @@ const WorkflowPreview = () => {
   const { handleCancelDebugAndPreviewPanel } = useWorkflowInteractions()
   const workflowRunningData = useStore(s => s.workflowRunningData)
   const showInputsPanel = useStore(s => s.showInputsPanel)
+  const workflowCanvasWidth = useStore(s => s.workflowCanvasWidth)
+  const panelWidth = useStore(s => s.previewPanelWidth)
+  const setPreviewPanelWidth = useStore(s => s.setPreviewPanelWidth)
   const showDebugAndPreviewPanel = useStore(s => s.showDebugAndPreviewPanel)
   const [currentTab, setCurrentTab] = useState<string>(showInputsPanel ? 'INPUT' : 'TRACING')
 
@@ -49,7 +52,6 @@ const WorkflowPreview = () => {
       switchTab('DETAIL')
   }, [workflowRunningData])
 
-  const [panelWidth, setPanelWidth] = useState(420)
   const [isResizing, setIsResizing] = useState(false)
 
   const startResizing = useCallback((e: React.MouseEvent) => {
@@ -64,10 +66,14 @@ const WorkflowPreview = () => {
   const resize = useCallback((e: MouseEvent) => {
     if (isResizing) {
       const newWidth = window.innerWidth - e.clientX
-      if (newWidth > 420 && newWidth < 1024)
-        setPanelWidth(newWidth)
+      // width constraints: 400 <= width <= maxAllowed (canvas - reserved 400)
+      const reservedCanvasWidth = 400
+      const maxAllowed = workflowCanvasWidth ? (workflowCanvasWidth - reservedCanvasWidth) : 1024
+
+      if (newWidth >= 400 && newWidth <= maxAllowed)
+        setPreviewPanelWidth(newWidth)
     }
-  }, [isResizing])
+  }, [isResizing, workflowCanvasWidth, setPreviewPanelWidth])
 
   useEffect(() => {
     window.addEventListener('mousemove', resize)
@@ -79,9 +85,9 @@ const WorkflowPreview = () => {
   }, [resize, stopResizing])
 
   return (
-    <div className={`
-      relative flex h-full flex-col rounded-l-2xl border-[0.5px] border-components-panel-border bg-components-panel-bg shadow-xl
-    `}
+    <div className={
+      'relative flex h-full flex-col rounded-l-2xl border-[0.5px] border-components-panel-border bg-components-panel-bg shadow-xl'
+    }
       style={{ width: `${panelWidth}px` }}
     >
       <div