fix(stream): when element is off the viewport CD should only be triggered if element is visible and value has changed

michaelbe812 · michaelbe812 · commit 4249cb661150 · 2023-04-12T21:04:20.000+02:00
closes #40
diff --git a/libs/stream/src/lib/stream.directive.ts b/libs/stream/src/lib/stream.directive.ts
@@ -261,7 +261,10 @@ export class StreamDirective<T> implements OnInit, OnDestroy {
         next: (val) => {
           const v = val[0] as any;
           const visible = val[1] ?? true;
-          if (visible) {
+          /**
+           * only update the view if the value has changed and the view is visible
+           */
+          if (visible && v !== this.context.$implicit) {
             this.context.$implicit = v;
             this.context.stream = v;
             this.context.loading = false;
