feat: optimize Vue node preview image display with reactive store

- Move preview display logic from inline ternaries to computed properties
- Add useNodePreviewState composable for preview state management
- Implement reactive store approach using Pinia storeToRefs
- Use VueUse useTimeoutFn for modern timeout management instead of window.setTimeout
- Add v-memo optimization for preview image template rendering
- Maintain proper sync between app.nodePreviewImages and reactive store state

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/graph/GraphCanvas.vue

@@ -74,6 +74,7 @@
 
 <script setup lang="ts">
 import { useEventListener, whenever } from '@vueuse/core'
+import { storeToRefs } from 'pinia'
 import {
   computed,
   onMounted,
@@ -113,7 +114,10 @@ import { CORE_SETTINGS } from '@/constants/coreSettings'
 import { i18n, t } from '@/i18n'
 import type { LGraphNode } from '@/lib/litegraph/src/litegraph'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
-import { SelectedNodeIdsKey } from '@/renderer/core/canvas/injectionKeys'
+import {
+  NodePreviewImagesKey,
+  SelectedNodeIdsKey
+} from '@/renderer/core/canvas/injectionKeys'
 import TransformPane from '@/renderer/core/layout/transform/TransformPane.vue'
 import MiniMap from '@/renderer/extensions/minimap/MiniMap.vue'
 import VueGraphNode from '@/renderer/extensions/vueNodes/components/LGraphNode.vue'
@@ -128,6 +132,7 @@ import { newUserService } from '@/services/newUserService'
 import { useWorkflowService } from '@/services/workflowService'
 import { useCommandStore } from '@/stores/commandStore'
 import { useExecutionStore } from '@/stores/executionStore'
+import { useNodeOutputStore } from '@/stores/imagePreviewStore'
 import { useNodeDefStore } from '@/stores/nodeDefStore'
 import { useSettingStore } from '@/stores/settingStore'
 import { useToastStore } from '@/stores/toastStore'
@@ -207,6 +212,9 @@ provide(SelectedNodeIdsKey, selectedNodeIds)
 
 // Provide execution state to all Vue nodes
 useExecutionStateProvider()
+// Provide preview images state to all Vue nodes
+const { nodePreviewImages } = storeToRefs(useNodeOutputStore())
+provide(NodePreviewImagesKey, nodePreviewImages)
 
 watchEffect(() => {
   nodeDefStore.showDeprecated = settingStore.get('Comfy.Node.ShowDeprecated')

src/renderer/core/canvas/injectionKeys.ts

@@ -23,3 +23,10 @@ export const ExecutingNodeIdsKey: InjectionKey<Ref<Set<string>>> =
 export const NodeProgressStatesKey: InjectionKey<
   Ref<Record<string, NodeProgressState>>
 > = Symbol('nodeProgressStates')
+
+/**
+ * Injection key for providing node preview image URLs to Vue node components.
+ * Maps NodeLocatorId (string) to an array of preview blob URLs.
+ */
+export const NodePreviewImagesKey: InjectionKey<Ref<Record<string, string[]>>> =
+  Symbol('nodePreviewImages')

src/renderer/extensions/vueNodes/components/LGraphNode.vue

@@ -120,6 +120,18 @@
           :lod-level="lodLevel"
           :image-urls="nodeImageUrls"
         />
+        <!-- Live preview image -->
+        <div
+          v-if="shouldShowPreviewImg"
+          v-memo="[latestPreviewUrl]"
+          class="px-4 min-h-[220px]"
+        >
+          <img
+            :src="latestPreviewUrl"
+            alt="preview"
+            class="w-full h-[220px] object-contain rounded-lg"
+          />
+        </div>
       </div>
     </template>
   </div>
@@ -144,6 +156,7 @@ import { SelectedNodeIdsKey } from '@/renderer/core/canvas/injectionKeys'
 import { useNodeExecutionState } from '@/renderer/extensions/vueNodes/execution/useNodeExecutionState'
 import { useNodeLayout } from '@/renderer/extensions/vueNodes/layout/useNodeLayout'
 import { LODLevel, useLOD } from '@/renderer/extensions/vueNodes/lod/useLOD'
+import { useNodePreviewState } from '@/renderer/extensions/vueNodes/preview/useNodePreviewState'
 import { ExecutedWsMessage } from '@/schemas/apiSchema'
 import { app } from '@/scripts/app'
 import { useExecutionStore } from '@/stores/executionStore'
@@ -316,6 +329,14 @@ const separatorClasses =
   'bg-sand-100 dark-theme:bg-charcoal-300 h-[1px] mx-0 w-full'
 const progressClasses = 'h-2 bg-primary-500 transition-all duration-300'
 
+const { latestPreviewUrl, shouldShowPreviewImg } = useNodePreviewState(
+  props.nodeData.id,
+  {
+    isMinimalLOD,
+    isCollapsed
+  }
+)
+
 // Common condition computations to avoid repetition
 const shouldShowWidgets = computed(
   () => shouldRenderWidgets.value && nodeData.widgets?.length

src/renderer/extensions/vueNodes/preview/useNodePreviewState.ts

@@ -0,0 +1,53 @@
+import { type Ref, computed, inject, ref } from 'vue'
+
+import { NodePreviewImagesKey } from '@/renderer/core/canvas/injectionKeys'
+import { useWorkflowStore } from '@/stores/workflowStore'
+
+export const useNodePreviewState = (
+  nodeId: string,
+  options?: {
+    isMinimalLOD?: Ref<boolean>
+    isCollapsed?: Ref<boolean>
+  }
+) => {
+  const workflowStore = useWorkflowStore()
+  const nodePreviewImages = inject(
+    NodePreviewImagesKey,
+    ref<Record<string, string[]>>({})
+  )
+
+  const locatorId = computed(() => workflowStore.nodeIdToNodeLocatorId(nodeId))
+
+  const previewUrls = computed(() => {
+    const key = locatorId.value
+    if (!key) return undefined
+    const urls = nodePreviewImages.value[key]
+    return urls && urls.length ? urls : undefined
+  })
+
+  const hasPreview = computed(() => !!previewUrls.value?.length)
+
+  const latestPreviewUrl = computed(() => {
+    const urls = previewUrls.value
+    return urls && urls.length ? urls[urls.length - 1] : ''
+  })
+
+  const shouldShowPreviewImg = computed(() => {
+    if (!options?.isMinimalLOD || !options?.isCollapsed) {
+      return hasPreview.value
+    }
+    return (
+      !options.isMinimalLOD.value &&
+      !options.isCollapsed.value &&
+      hasPreview.value
+    )
+  })
+
+  return {
+    locatorId,
+    previewUrls,
+    hasPreview,
+    latestPreviewUrl,
+    shouldShowPreviewImg
+  }
+}

src/renderer/extensions/vueNodes/preview/usePreviewStateProvider.ts

@@ -1,14 +0,0 @@
-import { computed, provide } from 'vue'
-
-import { NodePreviewImagesKey } from '@/renderer/core/canvas/injectionKeys'
-import { app } from '@/scripts/app'
-
-export const usePreviewStateProvider = () => {
-  // Provide reactive access to app.nodePreviewImages
-  // No need to duplicate data - app.nodePreviewImages is already reactive to changes
-  const nodePreviewImages = computed(() => app.nodePreviewImages)
-
-  provide(NodePreviewImagesKey, nodePreviewImages)
-
-  return { nodePreviewImages }
-}

src/stores/imagePreviewStore.ts

@@ -1,3 +1,4 @@
+import { useTimeoutFn } from '@vueuse/core'
 import { defineStore } from 'pinia'
 import { ref } from 'vue'
 
@@ -19,6 +20,8 @@ import type { NodeLocatorId } from '@/types/nodeIdentification'
 import { parseFilePath } from '@/utils/formatUtil'
 import { isVideoNode } from '@/utils/litegraphUtil'
 
+const PREVIEW_REVOKE_DELAY_MS = 400
+
 const createOutputs = (
   filenames: string[],
   type: ResultItemType,
@@ -40,9 +43,28 @@ interface SetOutputOptions {
 export const useNodeOutputStore = defineStore('nodeOutput', () => {
   const { nodeIdToNodeLocatorId } = useWorkflowStore()
   const { executionIdToNodeLocatorId } = useExecutionStore()
+  const scheduledRevoke: Record<NodeLocatorId, { stop: () => void }> = {}
+
+  function scheduleRevoke(locator: NodeLocatorId, cb: () => void) {
+    if (scheduledRevoke[locator]) {
+      scheduledRevoke[locator].stop()
+    }
+
+    const { stop } = useTimeoutFn(() => {
+      delete scheduledRevoke[locator]
+      cb()
+    }, PREVIEW_REVOKE_DELAY_MS)
+
+    scheduledRevoke[locator] = { stop }
+  }
 
   const nodeOutputs = ref<Record<string, ExecutedWsMessage['output']>>({})
 
+  // Reactive state for node preview images - mirrors app.nodePreviewImages
+  const nodePreviewImages = ref<Record<string, string[]>>(
+    app.nodePreviewImages || {}
+  )
+
   function getNodeOutputs(
     node: LGraphNode
   ): ExecutedWsMessage['output'] | undefined {
@@ -196,8 +218,12 @@ export const useNodeOutputStore = defineStore('nodeOutput', () => {
   ) {
     const nodeLocatorId = executionIdToNodeLocatorId(executionId)
     if (!nodeLocatorId) return
-
+    if (scheduledRevoke[nodeLocatorId]) {
+      scheduledRevoke[nodeLocatorId].stop()
+      delete scheduledRevoke[nodeLocatorId]
+    }
     app.nodePreviewImages[nodeLocatorId] = previewImages
+    nodePreviewImages.value[nodeLocatorId] = previewImages
   }
 
   /**
@@ -212,7 +238,12 @@ export const useNodeOutputStore = defineStore('nodeOutput', () => {
     previewImages: string[]
   ) {
     const nodeLocatorId = nodeIdToNodeLocatorId(nodeId)
+    if (scheduledRevoke[nodeLocatorId]) {
+      scheduledRevoke[nodeLocatorId].stop()
+      delete scheduledRevoke[nodeLocatorId]
+    }
     app.nodePreviewImages[nodeLocatorId] = previewImages
+    nodePreviewImages.value[nodeLocatorId] = previewImages
   }
 
   /**
@@ -224,8 +255,9 @@ export const useNodeOutputStore = defineStore('nodeOutput', () => {
   function revokePreviewsByExecutionId(executionId: string) {
     const nodeLocatorId = executionIdToNodeLocatorId(executionId)
     if (!nodeLocatorId) return
-
-    revokePreviewsByLocatorId(nodeLocatorId)
+    scheduleRevoke(nodeLocatorId, () =>
+      revokePreviewsByLocatorId(nodeLocatorId)
+    )
   }
 
   /**
@@ -243,6 +275,7 @@ export const useNodeOutputStore = defineStore('nodeOutput', () => {
     }
 
     delete app.nodePreviewImages[nodeLocatorId]
+    delete nodePreviewImages.value[nodeLocatorId]
   }
 
   /**
@@ -259,6 +292,7 @@ export const useNodeOutputStore = defineStore('nodeOutput', () => {
       }
     }
     app.nodePreviewImages = {}
+    nodePreviewImages.value = {}
   }
 
   /**
@@ -293,6 +327,7 @@ export const useNodeOutputStore = defineStore('nodeOutput', () => {
     // Clear preview images
     if (app.nodePreviewImages[nodeLocatorId]) {
       delete app.nodePreviewImages[nodeLocatorId]
+      delete nodePreviewImages.value[nodeLocatorId]
     }
 
     return hadOutputs
@@ -318,6 +353,7 @@ export const useNodeOutputStore = defineStore('nodeOutput', () => {
     removeNodeOutputs,
 
     // State
-    nodeOutputs
+    nodeOutputs,
+    nodePreviewImages
   }
 })