feat: introduce trigger functionality (#27644)

Signed-off-by: lyzno1 <yuanyouhuilyz@gmail.com>
Co-authored-by: Stream <Stream_2@qq.com>
Co-authored-by: lyzno1 <92089059+lyzno1@users.noreply.github.com>
Co-authored-by: zhsama <torvalds@linux.do>
Co-authored-by: Harry <xh001x@hotmail.com>
Co-authored-by: lyzno1 <yuanyouhuilyz@gmail.com>
Co-authored-by: yessenia <yessenia.contact@gmail.com>
Co-authored-by: hjlarry <hjlarry@163.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: WTW0313 <twwu@dify.ai>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

web/app/components/workflow/hooks/use-workflow.ts

@@ -23,6 +23,10 @@ import {
   useStore,
   useWorkflowStore,
 } from '../store'
+import {
+  getWorkflowEntryNode,
+  isWorkflowEntryNode,
+} from '../utils/workflow-entry'
 import {
   SUPPORT_OUTPUT_VARS_NODE,
 } from '../constants'
@@ -36,11 +40,12 @@ import { useStore as useAppStore } from '@/app/components/app/store'
 import { CUSTOM_ITERATION_START_NODE } from '@/app/components/workflow/nodes/iteration-start/constants'
 import { CUSTOM_LOOP_START_NODE } from '@/app/components/workflow/nodes/loop-start/constants'
 import { useNodesMetaData } from '.'
+import { AppModeEnum } from '@/types/app'
 
 export const useIsChatMode = () => {
   const appDetail = useAppStore(s => s.appDetail)
 
-  return appDetail?.mode === 'advanced-chat'
+  return appDetail?.mode === AppModeEnum.ADVANCED_CHAT
 }
 
 export const useWorkflow = () => {
@@ -63,6 +68,7 @@ export const useWorkflow = () => {
       edges,
     } = store.getState()
     const nodes = getNodes()
+    // let startNode = getWorkflowEntryNode(nodes)
     const currentNode = nodes.find(node => node.id === nodeId)
 
     let startNodes = nodes.filter(node => nodesMap?.[node.data.type as BlockEnum]?.metaData.isStart) || []
@@ -232,6 +238,33 @@ export const useWorkflow = () => {
     return nodes.filter(node => node.parentId === nodeId)
   }, [store])
 
+  const isFromStartNode = useCallback((nodeId: string) => {
+    const { getNodes } = store.getState()
+    const nodes = getNodes()
+    const currentNode = nodes.find(node => node.id === nodeId)
+
+    if (!currentNode)
+      return false
+
+    if (isWorkflowEntryNode(currentNode.data.type))
+      return true
+
+    const checkPreviousNodes = (node: Node) => {
+      const previousNodes = getBeforeNodeById(node.id)
+
+      for (const prevNode of previousNodes) {
+        if (isWorkflowEntryNode(prevNode.data.type))
+          return true
+        if (checkPreviousNodes(prevNode))
+          return true
+      }
+
+      return false
+    }
+
+    return checkPreviousNodes(currentNode)
+  }, [store, getBeforeNodeById])
+
   const handleOutVarRenameChange = useCallback((nodeId: string, oldValeSelector: ValueSelector, newVarSelector: ValueSelector) => {
     const { getNodes, setNodes } = store.getState()
     const allNodes = getNodes()
@@ -391,6 +424,13 @@ export const useWorkflow = () => {
     return !hasCycle(targetNode)
   }, [store, getAvailableBlocks])
 
+  const getNode = useCallback((nodeId?: string) => {
+    const { getNodes } = store.getState()
+    const nodes = getNodes()
+
+    return nodes.find(node => node.id === nodeId) || getWorkflowEntryNode(nodes)
+  }, [store])
+
   return {
     getNodeById,
     getTreeLeafNodes,
@@ -407,6 +447,8 @@ export const useWorkflow = () => {
     getLoopNodeChildren,
     getRootNodesById,
     getStartNodes,
+    isFromStartNode,
+    getNode,
   }
 }
 
@@ -430,14 +472,14 @@ export const useNodesReadOnly = () => {
   const historyWorkflowData = useStore(s => s.historyWorkflowData)
   const isRestoring = useStore(s => s.isRestoring)
 
-  const getNodesReadOnly = useCallback(() => {
+  const getNodesReadOnly = useCallback((): boolean => {
     const {
       workflowRunningData,
       historyWorkflowData,
       isRestoring,
     } = workflowStore.getState()
 
-    return workflowRunningData?.result.status === WorkflowRunningStatus.Running || historyWorkflowData || isRestoring
+    return !!(workflowRunningData?.result.status === WorkflowRunningStatus.Running || historyWorkflowData || isRestoring)
   }, [workflowStore])
 
   return {