[Workflow list] Add delete modal; add empty list msg

public/general_components/delete_workflow_modal.tsx

@@ -0,0 +1,45 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import React from 'react';
+import {
+  EuiButton,
+  EuiModal,
+  EuiModalBody,
+  EuiModalFooter,
+  EuiModalHeader,
+  EuiModalHeaderTitle,
+  EuiText,
+} from '@elastic/eui';
+import { Workflow } from '../../common';
+
+interface DeleteWorkflowModalProps {
+  workflow: Workflow;
+  onClose: () => void;
+  onConfirm: () => void;
+}
+
+/**
+ * A general delete workflow modal.
+ */
+export function DeleteWorkflowModal(props: DeleteWorkflowModalProps) {
+  return (
+    <EuiModal onClose={props.onClose}>
+      <EuiModalHeader>
+        <EuiModalHeaderTitle>
+          <p>{`Delete ${props.workflow.name}?`}</p>
+        </EuiModalHeaderTitle>
+      </EuiModalHeader>
+      <EuiModalBody>
+        <EuiText>The workflow will be permanently deleted.</EuiText>
+      </EuiModalBody>
+      <EuiModalFooter>
+        <EuiButton onClick={props.onConfirm} fill={true} color="danger">
+          Confirm
+        </EuiButton>
+      </EuiModalFooter>
+    </EuiModal>
+  );
+}

public/general_components/index.ts

@@ -4,3 +4,4 @@
  */
 
 export { MultiSelectFilter } from './multi_select_filter';
+export { DeleteWorkflowModal } from './delete_workflow_modal';

public/pages/workflows/empty_list_message.tsx

@@ -0,0 +1,43 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import React from 'react';
+import {
+  EuiButton,
+  EuiFlexGroup,
+  EuiFlexItem,
+  EuiSpacer,
+  EuiText,
+  EuiTitle,
+} from '@elastic/eui';
+
+interface EmptyListMessageProps {
+  onClickNewWorkflow: () => void;
+}
+
+export function EmptyListMessage(props: EmptyListMessageProps) {
+  return (
+    <EuiFlexGroup direction="column" alignItems="center" gutterSize="m">
+      <EuiFlexItem>
+        <EuiSpacer size="m" />
+      </EuiFlexItem>
+      <EuiFlexItem>
+        <EuiTitle size="s">
+          <h3>No workflows found</h3>
+        </EuiTitle>
+      </EuiFlexItem>
+      <EuiFlexItem>
+        <EuiText size="s">
+          Create a workflow to start building and testing your application.
+        </EuiText>
+      </EuiFlexItem>
+      <EuiFlexItem>
+        <EuiButton fill={false} onClick={props.onClickNewWorkflow}>
+          New workflow
+        </EuiButton>
+      </EuiFlexItem>
+    </EuiFlexGroup>
+  );
+}

public/pages/workflows/workflow_list/workflow_list.tsx

@@ -18,7 +18,10 @@ import {
 import { AppState, deleteWorkflow } from '../../../store';
 import { Workflow } from '../../../../common';
 import { columns } from './columns';
-import { MultiSelectFilter } from '../../../general_components';
+import {
+  DeleteWorkflowModal,
+  MultiSelectFilter,
+} from '../../../general_components';
 import { getStateOptions } from '../../../utils';
 
 interface WorkflowListProps {}
@@ -39,6 +42,16 @@ export function WorkflowList(props: WorkflowListProps) {
     (state: AppState) => state.workflows
   );
 
+  // delete workflow state
+  const [isDeleteModalOpen, setIsDeleteModalOpen] = useState<boolean>(false);
+  const [workflowToDelete, setWorkflowToDelete] = useState<
+    Workflow | undefined
+  >(undefined);
+  function clearDeleteState() {
+    setWorkflowToDelete(undefined);
+    setIsDeleteModalOpen(false);
+  }
+
   // search bar state
   const [searchQuery, setSearchQuery] = useState<string>('');
   const debounceSearchQuery = debounce((query: string) => {
@@ -70,48 +83,57 @@ export function WorkflowList(props: WorkflowListProps) {
       icon: 'trash',
       color: 'danger',
       onClick: (item: Workflow) => {
-        dispatch(deleteWorkflow(item.id));
+        setWorkflowToDelete(item);
+        setIsDeleteModalOpen(true);
       },
     },
   ];
 
   return (
-    <EuiFlexGroup direction="column">
-      <EuiFlexItem>
-        <EuiFlexGroup direction="row" gutterSize="m">
-          <EuiFlexItem grow={true}>
-            <EuiFieldSearch
-              fullWidth={true}
-              placeholder="Search workflows..."
-              onChange={(e) => debounceSearchQuery(e.target.value)}
+    <>
+      {isDeleteModalOpen && workflowToDelete !== undefined && (
+        <DeleteWorkflowModal
+          workflow={workflowToDelete}
+          onClose={() => {
+            clearDeleteState();
+          }}
+          onConfirm={() => {
+            dispatch(deleteWorkflow(workflowToDelete.id));
+            clearDeleteState();
+          }}
+        />
+      )}
+      <EuiFlexGroup direction="column">
+        <EuiFlexItem>
+          <EuiFlexGroup direction="row" gutterSize="m">
+            <EuiFlexItem grow={true}>
+              <EuiFieldSearch
+                fullWidth={true}
+                placeholder="Search workflows..."
+                onChange={(e) => debounceSearchQuery(e.target.value)}
+              />
+            </EuiFlexItem>
+            <MultiSelectFilter
+              filters={getStateOptions()}
+              title="Status"
+              setSelectedFilters={setSelectedStates}
             />
-          </EuiFlexItem>
-          <MultiSelectFilter
-            filters={getStateOptions()}
-            title="Status"
-            setSelectedFilters={setSelectedStates}
+          </EuiFlexGroup>
+        </EuiFlexItem>
+        <EuiFlexItem>
+          <EuiInMemoryTable<Workflow>
+            items={filteredWorkflows}
+            rowHeader="name"
+            // @ts-ignore
+            columns={columns(tableActions)}
+            sorting={sorting}
+            pagination={true}
+            message={loading === true ? <EuiLoadingSpinner size="xl" /> : null}
+            hasActions={true}
           />
-        </EuiFlexGroup>
-      </EuiFlexItem>
-      <EuiFlexItem>
-        <EuiInMemoryTable<Workflow>
-          items={filteredWorkflows}
-          rowHeader="name"
-          // @ts-ignore
-          columns={columns(tableActions)}
-          sorting={sorting}
-          pagination={true}
-          message={
-            loading === true ? (
-              <EuiLoadingSpinner size="xl" />
-            ) : (
-              'No existing workflows found'
-            )
-          }
-          hasActions={true}
-        />
-      </EuiFlexItem>
-    </EuiFlexGroup>
+        </EuiFlexItem>
+      </EuiFlexGroup>
+    </>
   );
 }
 

public/pages/workflows/workflows.tsx

@@ -20,6 +20,7 @@ import { getCore } from '../../services';
 import { WorkflowList } from './workflow_list';
 import { NewWorkflow } from './new_workflow';
 import { AppState, searchWorkflows } from '../../store';
+import { EmptyListMessage } from './empty_list_message';
 
 export interface WorkflowsRouterProps {}
 
@@ -48,7 +49,9 @@ function replaceActiveTab(activeTab: string, props: WorkflowsProps) {
  */
 export function Workflows(props: WorkflowsProps) {
   const dispatch = useDispatch();
-  const { workflows } = useSelector((state: AppState) => state.workflows);
+  const { workflows, loading } = useSelector(
+    (state: AppState) => state.workflows
+  );
 
   const tabFromUrl = queryString.parse(useLocation().search)[
     ACTIVE_TAB_PARAM
@@ -130,6 +133,16 @@ export function Workflows(props: WorkflowsProps) {
           <EuiSpacer size="m" />
           {selectedTabId === WORKFLOWS_TAB.MANAGE && <WorkflowList />}
           {selectedTabId === WORKFLOWS_TAB.CREATE && <NewWorkflow />}
+          {selectedTabId === WORKFLOWS_TAB.MANAGE &&
+            Object.values(workflows).length === 0 &&
+            !loading && (
+              <EmptyListMessage
+                onClickNewWorkflow={() => {
+                  setSelectedTabId(WORKFLOWS_TAB.CREATE);
+                  replaceActiveTab(WORKFLOWS_TAB.CREATE, props);
+                }}
+              />
+            )}
         </EuiPageContent>
       </EuiPageBody>
     </EuiPage>