[no-issue] remove viewChildren use (#3116)

* remove viewChildren component use in lib and demoshell

* Update trashcan.component.ts

* Update trashcan.component.ts

lib/process-services/process-list/components/process-instance-details.component.html

@@ -5,6 +5,7 @@
     </mat-card-header>
     <mat-card-content>
         <adf-process-instance-header
+            #processInstanceHeader
             [processInstance]="processInstanceDetails"
             (showProcessDiagram)="onShowProcessDiagram($event)">
         </adf-process-instance-header>
@@ -14,6 +15,7 @@
         <mat-card>
             <mat-card-content>
                 <adf-process-instance-tasks
+                    #processInstanceTasks
                     [processInstanceDetails]="processInstanceDetails"
                     (taskClick)="onTaskClicked($event)">
                 </adf-process-instance-tasks>

lib/process-services/process-list/components/process-instance-details.component.ts

@@ -36,10 +36,10 @@ export class ProcessInstanceDetailsComponent implements OnChanges {
     @Input()
     processInstanceId: string;
 
-    @ViewChild(ProcessInstanceHeaderComponent)
+    @ViewChild('processInstanceHeader')
     processInstanceHeader: ProcessInstanceHeaderComponent;
 
-    @ViewChild(ProcessInstanceTasksComponent)
+    @ViewChild('processInstanceTasks')
     tasksList: ProcessInstanceTasksComponent;
 
     /** Toggles whether to show or hide the title. */

lib/process-services/process-list/components/start-process.component.html

@@ -20,7 +20,9 @@
             </mat-form-field>
         </div>
 
-        <adf-start-form *ngIf="hasStartForm()"
+        <adf-start-form
+            #startForm
+            *ngIf="hasStartForm()"
                         [data]="values"
             [disableStartProcessButton]="!hasProcessName()"
 			[processDefinitionId]="selectedProcessDef.id"

lib/process-services/process-list/components/start-process.component.ts

@@ -86,7 +86,7 @@ export class StartProcessInstanceComponent implements OnChanges {
     @Output()
     error: EventEmitter<ProcessInstance> = new EventEmitter<ProcessInstance>();
 
-    @ViewChild(StartFormComponent)
+    @ViewChild('startForm')
     startForm: StartFormComponent;
 
     processDefinitions: ProcessDefinitionRepresentation[] = [];