🚀 Add more fields to `RefreshProgressIndicator` (#135207)

Resolves #134494

packages/flutter/lib/src/material/progress_indicator.dart

@@ -865,8 +865,21 @@ class RefreshProgressIndicator extends CircularProgressIndicator {
     super.semanticsLabel,
     super.semanticsValue,
     super.strokeCap,
+    this.elevation = 2.0,
+    this.indicatorMargin = const EdgeInsets.all(4.0),
+    this.indicatorPadding = const EdgeInsets.all(12.0),
   });
 
+  /// {@macro flutter.material.material.elevation}
+  final double elevation;
+
+  /// The amount of space by which to inset the whole indicator.
+  /// It accommodates the [elevation] of the indicator.
+  final EdgeInsetsGeometry indicatorMargin;
+
+  /// The amount of space by which to inset the inner refresh indicator.
+  final EdgeInsetsGeometry indicatorPadding;
+
   /// Default stroke width.
   static const double defaultStrokeWidth = 2.5;
 
@@ -913,6 +926,10 @@ class _RefreshProgressIndicatorState extends _CircularProgressIndicatorState {
   // Last value received from the widget before null.
   double? _lastValue;
 
+  /// Force casting the widget as [RefreshProgressIndicator].
+  @override
+  RefreshProgressIndicator get widget => super.widget as RefreshProgressIndicator;
+
   // Always show the indeterminate version of the circular progress indicator.
   //
   // When value is non-null the sweep of the progress indicator arrow's arc
@@ -973,13 +990,13 @@ class _RefreshProgressIndicatorState extends _CircularProgressIndicatorState {
       child: Container(
         width: _indicatorSize,
         height: _indicatorSize,
-        margin: const EdgeInsets.all(4.0), // accommodate the shadow
+        margin: widget.indicatorMargin,
         child: Material(
           type: MaterialType.circle,
           color: backgroundColor,
-          elevation: 2.0,
+          elevation: widget.elevation,
           child: Padding(
-            padding: const EdgeInsets.all(12.0),
+            padding: widget.indicatorPadding,
             child: Opacity(
               opacity: opacity,
               child: Transform.rotate(

packages/flutter/test/material/progress_indicator_test.dart

@@ -1183,6 +1183,75 @@ void main() {
 
     expect(tester.getSize(find.byType(CircularProgressIndicator)), const Size(36, 36));
   });
+
+  testWidgetsWithLeakTracking('RefreshProgressIndicator using fields correctly', (WidgetTester tester) async {
+    Future<void> pumpIndicator(RefreshProgressIndicator indicator) {
+      return tester.pumpWidget(Theme(data: theme, child: indicator));
+    }
+
+    // With default values.
+    await pumpIndicator(const RefreshProgressIndicator());
+    Material material = tester.widget(
+      find.descendant(
+        of: find.byType(RefreshProgressIndicator),
+        matching: find.byType(Material),
+      ),
+    );
+    Container container = tester.widget(
+      find.descendant(
+        of: find.byType(RefreshProgressIndicator),
+        matching: find.byType(Container),
+      ),
+    );
+    Padding padding = tester.widget(
+      find.descendant(
+        of: find.descendant(
+          of: find.byType(RefreshProgressIndicator),
+          matching: find.byType(Material),
+        ),
+        matching: find.byType(Padding),
+      ),
+    );
+    expect(material.elevation, 2.0);
+    expect(container.margin, const EdgeInsets.all(4.0));
+    expect(padding.padding, const EdgeInsets.all(12.0));
+
+    // With values provided.
+    const double testElevation = 1.0;
+    const EdgeInsetsGeometry testIndicatorMargin = EdgeInsets.all(6.0);
+    const EdgeInsetsGeometry testIndicatorPadding = EdgeInsets.all(10.0);
+    await pumpIndicator(
+      const RefreshProgressIndicator(
+        elevation: testElevation,
+        indicatorMargin: testIndicatorMargin,
+        indicatorPadding: testIndicatorPadding,
+      ),
+    );
+    material = tester.widget(
+      find.descendant(
+        of: find.byType(RefreshProgressIndicator),
+        matching: find.byType(Material),
+      ),
+    );
+    container = tester.widget(
+      find.descendant(
+        of: find.byType(RefreshProgressIndicator),
+        matching: find.byType(Container),
+      ),
+    );
+    padding = tester.widget(
+      find.descendant(
+        of: find.descendant(
+          of: find.byType(RefreshProgressIndicator),
+          matching: find.byType(Material),
+        ),
+        matching: find.byType(Padding),
+      ),
+    );
+    expect(material.elevation, testElevation);
+    expect(container.margin, testIndicatorMargin);
+    expect(padding.padding, testIndicatorPadding);
+  });
 }
 
 class _RefreshProgressIndicatorGolden extends StatefulWidget {