Add null pointer handler for popup_source_directive.

TedSander · nshahan · commit da1486bb14f6 · 2018-05-29T10:03:59.000-07:00
PiperOrigin-RevId: 197820164
diff --git a/lib/src/laminate/popup/popup_source_directive.dart b/lib/src/laminate/popup/popup_source_directive.dart
@@ -79,7 +79,7 @@ class PopupSourceDirective
 
   @override
   Stream<Rectangle<num>> onDimensionsChanged({bool track: false}) {
-    return _popupSource.onDimensionsChanged(track: track).distinct();
+    return _popupSource?.onDimensionsChanged(track: track)?.distinct();
   }
 
   @override

Original file line number	Diff line number	Diff line change
`@@ -79,7 +79,7 @@ class PopupSourceDirective`
`79`	`79`
`80`	`80`	`@override`
`81`	`81`	`Stream<Rectangle<num>> onDimensionsChanged({bool track: false}) {`
`82`		`- return _popupSource.onDimensionsChanged(track: track).distinct();`
	`82`	`+ return _popupSource?.onDimensionsChanged(track: track)?.distinct();`
`83`	`83`	`}`
`84`	`84`
`85`	`85`	`@override`