fix: extract back layer scrim

fluttercommunity · Feb 14, 2021 · d50f5be · d50f5be
1 parent 69c2377
commit d50f5be
Showing 1 changed file with 8 additions and 4 deletions.
diff --git a/lib/scaffold.dart b/lib/scaffold.dart
@@ -614,10 +614,7 @@ class BackdropScaffoldState extends State<BackdropScaffold>
                 fit: StackFit.expand,
                 children: <Widget>[
                   _buildBackPanel(),
-                  if (isBackLayerConcealed && widget.frontLayerActiveFactor < 1)
-                    Container(
-                        color: _backLayerScrimColorTween.evaluate(controller),
-                        height: _backPanelHeight),
+                  if (_hasBackLayerScrim) _buildBackLayerScrim(),
                   PositionedTransition(
                     rect: _getPanelAnimation(context, constraints),
                     child: _buildFrontPanel(context),
@@ -649,6 +646,13 @@ class BackdropScaffoldState extends State<BackdropScaffold>
     );
   }
 
+  Container _buildBackLayerScrim() => Container(
+      color: _backLayerScrimColorTween.evaluate(controller),
+      height: _backPanelHeight);
+
+  bool get _hasBackLayerScrim =>
+      isBackLayerConcealed && widget.frontLayerActiveFactor < 1;
+
   @override
   Widget build(BuildContext context) {
     return Backdrop(