Merge pull request #6917 from devaskim/2_process_no_data_by_widget

[3.4.2] UI: Let custom widget to process no-data case

ui-ngx/src/app/modules/home/components/widget/widget-component.service.ts

@@ -540,6 +540,9 @@ export class WidgetComponentService {
       if (isUndefined(result.typeParameters.stateData)) {
         result.typeParameters.stateData = false;
       }
+      if (isUndefined(result.typeParameters.processNoDataByWidget)) {
+        result.typeParameters.processNoDataByWidget = false;
+      }
       if (isFunction(widgetTypeInstance.actionSources)) {
         result.actionSources = widgetTypeInstance.actionSources();
       } else {

ui-ngx/src/app/modules/home/components/widget/widget.component.ts

@@ -400,17 +400,17 @@ export class WidgetComponent extends PageComponent implements OnInit, AfterViewI
   }
 
   private displayWidgetInstance(): boolean {
-    if (this.widget.type !== widgetType.static) {
-      for (const id of Object.keys(this.widgetContext.subscriptions)) {
-        const subscription = this.widgetContext.subscriptions[id];
-        if (subscription.isDataResolved()) {
-          return true;
-        }
-      }
-      return false;
-    } else {
+    if (this.widget.type === widgetType.static || this.typeParameters?.processNoDataByWidget) {
       return true;
     }
+
+    for (const id of Object.keys(this.widgetContext.subscriptions)) {
+      const subscription = this.widgetContext.subscriptions[id];
+      if (subscription.isDataResolved()) {
+        return true;
+      }
+    }
+    return false;
   }
 
   private onDestroy() {

ui-ngx/src/app/shared/models/widget.models.ts

@@ -173,7 +173,7 @@ export interface WidgetTypeParameters {
   hasAdditionalLatestDataKeys?: boolean;
   warnOnPageDataOverflow?: boolean;
   ignoreDataUpdateOnIntervalTick?: boolean;
-
+  processNoDataByWidget?: boolean;
 }
 
 export interface WidgetControllerDescriptor {