refactor(mobile): Use switch expression when possible (#15852)

refactor: Use `switch` expression when possible

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/widgets/photo_view/photo_view.dart

@@ -590,21 +590,15 @@ class _PhotoViewState extends State<PhotoView>
 }
 
 /// The default [ScaleStateCycle]
-PhotoViewScaleState defaultScaleStateCycle(PhotoViewScaleState actual) {
-  switch (actual) {
-    case PhotoViewScaleState.initial:
-      return PhotoViewScaleState.covering;
-    case PhotoViewScaleState.covering:
-      return PhotoViewScaleState.originalSize;
-    case PhotoViewScaleState.originalSize:
-      return PhotoViewScaleState.initial;
-    case PhotoViewScaleState.zoomedIn:
-    case PhotoViewScaleState.zoomedOut:
-      return PhotoViewScaleState.initial;
-    default:
-      return PhotoViewScaleState.initial;
-  }
-}
+PhotoViewScaleState defaultScaleStateCycle(PhotoViewScaleState actual) =>
+    switch (actual) {
+      PhotoViewScaleState.initial => PhotoViewScaleState.covering,
+      PhotoViewScaleState.covering => PhotoViewScaleState.originalSize,
+      PhotoViewScaleState.originalSize => PhotoViewScaleState.initial,
+      PhotoViewScaleState.zoomedIn ||
+      PhotoViewScaleState.zoomedOut =>
+        PhotoViewScaleState.initial,
+    };
 
 /// A type definition for a [Function] that receives the actual [PhotoViewScaleState] and returns the next one
 /// It is used internally to walk in the "doubletap gesture cycle".

mobile/lib/widgets/photo_view/src/utils/photo_view_utils.dart

@@ -9,25 +9,20 @@ double getScaleForScaleState(
   PhotoViewScaleState scaleState,
   ScaleBoundaries scaleBoundaries,
 ) {
-  switch (scaleState) {
-    case PhotoViewScaleState.initial:
-    case PhotoViewScaleState.zoomedIn:
-    case PhotoViewScaleState.zoomedOut:
-      return _clampSize(scaleBoundaries.initialScale, scaleBoundaries);
-    case PhotoViewScaleState.covering:
-      return _clampSize(
+  return switch (scaleState) {
+    PhotoViewScaleState.initial ||
+    PhotoViewScaleState.zoomedIn ||
+    PhotoViewScaleState.zoomedOut =>
+      _clampSize(scaleBoundaries.initialScale, scaleBoundaries),
+    PhotoViewScaleState.covering => _clampSize(
         _scaleForCovering(
           scaleBoundaries.outerSize,
           scaleBoundaries.childSize,
         ),
         scaleBoundaries,
-      );
-    case PhotoViewScaleState.originalSize:
-      return _clampSize(1.0, scaleBoundaries);
-    // Will never be reached
-    default:
-      return 0;
-  }
+      ),
+    PhotoViewScaleState.originalSize => _clampSize(1.0, scaleBoundaries),
+  };
 }
 
 /// Internal class to wraps custom scale boundaries (min, max and initial)