Copilot commented on code in PR #8376:
URL: https://github.com/apache/texera/pull/8376#discussion_r3929424141


##########
frontend/src/app/workspace/component/workflow-form/workflow-form.component.ts:
##########
@@ -0,0 +1,155 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { ChangeDetectorRef, Component, HostListener, OnDestroy, OnInit } from 
"@angular/core";
+import { CommonModule } from "@angular/common";
+import { ActivatedRoute, Router } from "@angular/router";
+import { UntilDestroy, untilDestroyed } from "@ngneat/until-destroy";
+import { NzAvatarModule } from "ng-zorro-antd/avatar";
+import { UserIconComponent } from 
"../../../dashboard/component/user/user-icon/user-icon.component";
+import { forkJoin } from "rxjs";
+
+import { USER_WORKFLOW, USER_WORKSPACE } from "../../../app-routing.constant";
+import { ComputingUnitStatusService } from 
"../../../common/service/computing-unit/computing-unit-status/computing-unit-status.service";
+import { WorkflowPersistService } from 
"../../../common/service/workflow-persist/workflow-persist.service";
+import { NotificationService } from 
"../../../common/service/notification/notification.service";
+import { UserService } from "../../../common/service/user/user.service";
+import { ExecuteWorkflowService } from 
"../../service/execute-workflow/execute-workflow.service";
+import { OperatorMetadataService } from 
"../../service/operator-metadata/operator-metadata.service";
+import { WorkflowActionService } from 
"../../service/workflow-graph/model/workflow-action.service";
+import { GuiConfigService } from "../../../common/service/gui-config.service";
+import { WorkflowConsoleService } from 
"../../service/workflow-console/workflow-console.service";
+import { WorkflowResultService } from 
"../../service/workflow-result/workflow-result.service";
+import { DefaultView } from 
"../../../dashboard/type/workflow-metadata.interface";
+import { CoeditorUserIconComponent } from 
"../menu/coeditor-user-icon/coeditor-user-icon.component";
+import { CoeditorPresenceService } from 
"../../service/workflow-graph/model/coeditor-presence.service";
+
+/**
+ * The Form View: a second way to use a workflow. This PR lays down the page 
shell -- behind
+ * the feature flag it loads the workflow the URL names, shows it read-only, 
and hands back to
+ * the operator canvas. The title bar's rename/save, the read-only preview, 
the inputs, running
+ * and results are added on top by later PRs. A view, not a new object: it 
opens the same
+ * workflow the canvas does.
+ */
+@UntilDestroy()
+@Component({
+  selector: "texera-workflow-form",
+  templateUrl: "./workflow-form.component.html",
+  styleUrls: ["./workflow-form.component.scss"],
+  imports: [CommonModule, NzAvatarModule, UserIconComponent, 
CoeditorUserIconComponent],
+})
+export class WorkflowFormComponent implements OnInit, OnDestroy {

Review Comment:
   This component is never registered with Angular routing. 
`app-routing.module.ts` currently maps only `user/workflow/:id` to 
`WorkspaceComponent`, so `/user/workflow/7/form` falls through to the wildcard 
and redirects to the workflow list. Please import this component and add a 
`workflow/:id/form` route (before the generic workflow route) so the page 
introduced by this PR is reachable.



##########
frontend/src/app/workspace/component/workflow-form/workflow-form.component.ts:
##########
@@ -0,0 +1,155 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { ChangeDetectorRef, Component, HostListener, OnDestroy, OnInit } from 
"@angular/core";
+import { CommonModule } from "@angular/common";
+import { ActivatedRoute, Router } from "@angular/router";
+import { UntilDestroy, untilDestroyed } from "@ngneat/until-destroy";
+import { NzAvatarModule } from "ng-zorro-antd/avatar";
+import { UserIconComponent } from 
"../../../dashboard/component/user/user-icon/user-icon.component";
+import { forkJoin } from "rxjs";
+
+import { USER_WORKFLOW, USER_WORKSPACE } from "../../../app-routing.constant";
+import { ComputingUnitStatusService } from 
"../../../common/service/computing-unit/computing-unit-status/computing-unit-status.service";
+import { WorkflowPersistService } from 
"../../../common/service/workflow-persist/workflow-persist.service";
+import { NotificationService } from 
"../../../common/service/notification/notification.service";
+import { UserService } from "../../../common/service/user/user.service";
+import { ExecuteWorkflowService } from 
"../../service/execute-workflow/execute-workflow.service";
+import { OperatorMetadataService } from 
"../../service/operator-metadata/operator-metadata.service";
+import { WorkflowActionService } from 
"../../service/workflow-graph/model/workflow-action.service";
+import { GuiConfigService } from "../../../common/service/gui-config.service";
+import { WorkflowConsoleService } from 
"../../service/workflow-console/workflow-console.service";
+import { WorkflowResultService } from 
"../../service/workflow-result/workflow-result.service";
+import { DefaultView } from 
"../../../dashboard/type/workflow-metadata.interface";
+import { CoeditorUserIconComponent } from 
"../menu/coeditor-user-icon/coeditor-user-icon.component";
+import { CoeditorPresenceService } from 
"../../service/workflow-graph/model/coeditor-presence.service";
+
+/**
+ * The Form View: a second way to use a workflow. This PR lays down the page 
shell -- behind
+ * the feature flag it loads the workflow the URL names, shows it read-only, 
and hands back to
+ * the operator canvas. The title bar's rename/save, the read-only preview, 
the inputs, running
+ * and results are added on top by later PRs. A view, not a new object: it 
opens the same
+ * workflow the canvas does.
+ */
+@UntilDestroy()
+@Component({
+  selector: "texera-workflow-form",
+  templateUrl: "./workflow-form.component.html",
+  styleUrls: ["./workflow-form.component.scss"],
+  imports: [CommonModule, NzAvatarModule, UserIconComponent, 
CoeditorUserIconComponent],
+})
+export class WorkflowFormComponent implements OnInit, OnDestroy {
+  public wid?: number;
+  public workflowName = "";
+  public loading = true;
+
+  constructor(
+    // Public for the template: shows the same live collaborator avatars as 
the canvas.
+    public coeditorPresenceService: CoeditorPresenceService,
+    private route: ActivatedRoute,
+    private router: Router,
+    private workflowActionService: WorkflowActionService,
+    private workflowPersistService: WorkflowPersistService,
+    private operatorMetadataService: OperatorMetadataService,
+    private executeWorkflowService: ExecuteWorkflowService,
+    private workflowResultService: WorkflowResultService,
+    private notificationService: NotificationService,
+    private userService: UserService,
+    private cdr: ChangeDetectorRef,
+    private computingUnitStatusService: ComputingUnitStatusService,
+    private workflowConsoleService: WorkflowConsoleService,
+    private config: GuiConfigService
+  ) {}
+
+  ngOnInit(): void {
+    const wid = Number(this.route.snapshot.params.id);
+    if (!Number.isFinite(wid)) {
+      void this.router.navigate([USER_WORKFLOW]);
+      return;
+    }
+    this.wid = wid;
+    this.load(wid);
+  }
+
+  private load(wid: number): void {
+    this.workflowActionService.resetAsNewWorkflow();
+    forkJoin({
+      metadata: this.operatorMetadataService.getOperatorMetadata(),
+      workflow: this.workflowPersistService.retrieveWorkflow(wid),
+    })

Review Comment:
   The feature flag is checked only after both requests complete. When the flag 
is off, a metadata/workflow request failure therefore shows an access error and 
navigates to the list instead of unconditionally handing off to the canvas as 
specified; successful requests also perform unnecessary work. Guard the flag 
before starting `forkJoin`.



##########
frontend/src/app/workspace/component/workflow-form/workflow-form.component.html:
##########
@@ -0,0 +1,65 @@
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements.  See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership.  The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License.  You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing,
+ software distributed under the License is distributed on an
+ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ KIND, either express or implied.  See the License for the
+ specific language governing permissions and limitations
+ under the License.
+-->
+
+<!-- The operator canvas's title row, rebuilt here to the same measurements: 
same
+     height, same rule underneath, same full-bleed width, and the view switch 
pinned to
+     the same right inset ahead of the same user icon. The name is shown here; 
making it
+     editable (with the same rename/save the canvas gives) is the next PR. -->
+<div class="pc-topbar">

Review Comment:
   This adds a visible page shell and navigation control, but the PR 
description has no before/after screenshots or GIF. Repository guidance 
requires side-by-side visual evidence for frontend UI changes; please add it to 
the PR description.



##########
frontend/src/app/workspace/component/workflow-form/workflow-form.component.ts:
##########
@@ -0,0 +1,155 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { ChangeDetectorRef, Component, HostListener, OnDestroy, OnInit } from 
"@angular/core";
+import { CommonModule } from "@angular/common";
+import { ActivatedRoute, Router } from "@angular/router";
+import { UntilDestroy, untilDestroyed } from "@ngneat/until-destroy";
+import { NzAvatarModule } from "ng-zorro-antd/avatar";
+import { UserIconComponent } from 
"../../../dashboard/component/user/user-icon/user-icon.component";
+import { forkJoin } from "rxjs";
+
+import { USER_WORKFLOW, USER_WORKSPACE } from "../../../app-routing.constant";
+import { ComputingUnitStatusService } from 
"../../../common/service/computing-unit/computing-unit-status/computing-unit-status.service";
+import { WorkflowPersistService } from 
"../../../common/service/workflow-persist/workflow-persist.service";
+import { NotificationService } from 
"../../../common/service/notification/notification.service";
+import { UserService } from "../../../common/service/user/user.service";
+import { ExecuteWorkflowService } from 
"../../service/execute-workflow/execute-workflow.service";
+import { OperatorMetadataService } from 
"../../service/operator-metadata/operator-metadata.service";
+import { WorkflowActionService } from 
"../../service/workflow-graph/model/workflow-action.service";
+import { GuiConfigService } from "../../../common/service/gui-config.service";
+import { WorkflowConsoleService } from 
"../../service/workflow-console/workflow-console.service";
+import { WorkflowResultService } from 
"../../service/workflow-result/workflow-result.service";
+import { DefaultView } from 
"../../../dashboard/type/workflow-metadata.interface";
+import { CoeditorUserIconComponent } from 
"../menu/coeditor-user-icon/coeditor-user-icon.component";
+import { CoeditorPresenceService } from 
"../../service/workflow-graph/model/coeditor-presence.service";
+
+/**
+ * The Form View: a second way to use a workflow. This PR lays down the page 
shell -- behind
+ * the feature flag it loads the workflow the URL names, shows it read-only, 
and hands back to
+ * the operator canvas. The title bar's rename/save, the read-only preview, 
the inputs, running
+ * and results are added on top by later PRs. A view, not a new object: it 
opens the same
+ * workflow the canvas does.
+ */
+@UntilDestroy()
+@Component({
+  selector: "texera-workflow-form",
+  templateUrl: "./workflow-form.component.html",
+  styleUrls: ["./workflow-form.component.scss"],
+  imports: [CommonModule, NzAvatarModule, UserIconComponent, 
CoeditorUserIconComponent],
+})
+export class WorkflowFormComponent implements OnInit, OnDestroy {
+  public wid?: number;
+  public workflowName = "";
+  public loading = true;
+
+  constructor(
+    // Public for the template: shows the same live collaborator avatars as 
the canvas.
+    public coeditorPresenceService: CoeditorPresenceService,
+    private route: ActivatedRoute,
+    private router: Router,
+    private workflowActionService: WorkflowActionService,
+    private workflowPersistService: WorkflowPersistService,
+    private operatorMetadataService: OperatorMetadataService,
+    private executeWorkflowService: ExecuteWorkflowService,
+    private workflowResultService: WorkflowResultService,
+    private notificationService: NotificationService,
+    private userService: UserService,
+    private cdr: ChangeDetectorRef,
+    private computingUnitStatusService: ComputingUnitStatusService,
+    private workflowConsoleService: WorkflowConsoleService,
+    private config: GuiConfigService
+  ) {}
+
+  ngOnInit(): void {
+    const wid = Number(this.route.snapshot.params.id);
+    if (!Number.isFinite(wid)) {
+      void this.router.navigate([USER_WORKFLOW]);
+      return;
+    }
+    this.wid = wid;
+    this.load(wid);
+  }
+
+  private load(wid: number): void {
+    this.workflowActionService.resetAsNewWorkflow();
+    forkJoin({
+      metadata: this.operatorMetadataService.getOperatorMetadata(),
+      workflow: this.workflowPersistService.retrieveWorkflow(wid),
+    })
+      .pipe(untilDestroyed(this))
+      .subscribe({
+        next: ({ workflow }) => {
+          // The form is only offered where the feature flag is on and this 
workflow opens
+          // in it. Reaching this URL any other way lands on the operator 
canvas, not an
+          // empty page.
+          if (!this.config.env.formViewEnabled || workflow.defaultView !== 
DefaultView.FORM) {
+            void this.router.navigate([USER_WORKSPACE, String(wid)], { 
replaceUrl: true });
+            return;
+          }
+          this.workflowName = workflow.name;
+          this.workflowActionService.setNewSharedModel(wid, 
this.userService.getCurrentUser());
+          this.workflowActionService.reloadWorkflow(workflow);
+          // The workflow is shown, not edited, from here: dragging operators 
around or
+          // deleting them belongs to the operator canvas.
+          this.applyEditability();
+          this.loading = false;
+          this.cdr.detectChanges();
+        },
+        error: () => {
+          this.notificationService.error("You do not have access to this 
workflow.");
+          void this.router.navigate([USER_WORKFLOW]);
+        },

Review Comment:
   This handler also receives failures from `getOperatorMetadata()` and generic 
network/server failures, so it can incorrectly tell users they lack workflow 
access. Use a neutral “Unable to open this workflow” message, or distinguish 
the workflow authorization response from other failures.



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