From bae79714317430baa8e9d2edeb6accdaedfd5e06 Mon Sep 17 00:00:00 2001
From: Jatin Nagar <121741542+itsjatinnagar@users.noreply.github.com>
Date: Sun, 6 Oct 2024 20:19:20 +0530
Subject: [PATCH] CheckboxListTile: add property to scale the checkbox
 (#154806)

Added a property in the CheckboxListTile to scale the underlying Checkbox using `Transform.scale`.

Fixes: #81334
---
 .../lib/src/material/checkbox_list_tile.dart  | 81 +++++++++++--------
 .../material/checkbox_list_tile_test.dart     | 43 ++++++++++
 2 files changed, 90 insertions(+), 34 deletions(-)

diff --git a/packages/flutter/lib/src/material/checkbox_list_tile.dart b/packages/flutter/lib/src/material/checkbox_list_tile.dart
index 0c3718fb7f6..decde74b991 100644
--- a/packages/flutter/lib/src/material/checkbox_list_tile.dart
+++ b/packages/flutter/lib/src/material/checkbox_list_tile.dart
@@ -205,6 +205,7 @@ class CheckboxListTile extends StatelessWidget {
     this.onFocusChange,
     this.enableFeedback,
     this.checkboxSemanticLabel,
+    this.checkboxScaleFactor = 1.0,
     this.internalAddSemanticForOnTap = false,
   }) : _checkboxType = _CheckboxType.material,
        assert(tristate || value != null),
@@ -250,6 +251,7 @@ class CheckboxListTile extends StatelessWidget {
     this.onFocusChange,
     this.enableFeedback,
     this.checkboxSemanticLabel,
+    this.checkboxScaleFactor = 1.0,
     this.internalAddSemanticForOnTap = false,
   }) : _checkboxType = _CheckboxType.adaptive,
        assert(tristate || value != null),
@@ -473,6 +475,11 @@ class CheckboxListTile extends StatelessWidget {
   // the default value to true.
   final bool internalAddSemanticForOnTap;
 
+  /// Controls the scaling factor applied to the [Checkbox] within the [CheckboxListTile].
+  ///
+  /// Defaults to 1.0.
+  final double checkboxScaleFactor;
+
   /// {@macro flutter.material.checkbox.semanticLabel}
   final String? checkboxSemanticLabel;
 
@@ -497,44 +504,50 @@ class CheckboxListTile extends StatelessWidget {
     switch (_checkboxType) {
       case _CheckboxType.material:
         control = ExcludeFocus(
-          child: Checkbox(
-            value: value,
-            onChanged: enabled ?? true ? onChanged : null,
-            mouseCursor: mouseCursor,
-            activeColor: activeColor,
-            fillColor: fillColor,
-            checkColor: checkColor,
-            hoverColor: hoverColor,
-            overlayColor: overlayColor,
-            splashRadius: splashRadius,
-            materialTapTargetSize: materialTapTargetSize ?? MaterialTapTargetSize.shrinkWrap,
-            autofocus: autofocus,
-            tristate: tristate,
-            shape: checkboxShape,
-            side: side,
-            isError: isError,
-            semanticLabel: checkboxSemanticLabel,
+          child: Transform.scale(
+            scale: checkboxScaleFactor,
+            child: Checkbox(
+              value: value,
+              onChanged: enabled ?? true ? onChanged : null,
+              mouseCursor: mouseCursor,
+              activeColor: activeColor,
+              fillColor: fillColor,
+              checkColor: checkColor,
+              hoverColor: hoverColor,
+              overlayColor: overlayColor,
+              splashRadius: splashRadius,
+              materialTapTargetSize: materialTapTargetSize ?? MaterialTapTargetSize.shrinkWrap,
+              autofocus: autofocus,
+              tristate: tristate,
+              shape: checkboxShape,
+              side: side,
+              isError: isError,
+              semanticLabel: checkboxSemanticLabel,
+            ),
           ),
         );
       case _CheckboxType.adaptive:
         control = ExcludeFocus(
-          child: Checkbox.adaptive(
-            value: value,
-            onChanged: enabled ?? true ? onChanged : null,
-            mouseCursor: mouseCursor,
-            activeColor: activeColor,
-            fillColor: fillColor,
-            checkColor: checkColor,
-            hoverColor: hoverColor,
-            overlayColor: overlayColor,
-            splashRadius: splashRadius,
-            materialTapTargetSize: materialTapTargetSize ?? MaterialTapTargetSize.shrinkWrap,
-            autofocus: autofocus,
-            tristate: tristate,
-            shape: checkboxShape,
-            side: side,
-            isError: isError,
-            semanticLabel: checkboxSemanticLabel,
+          child: Transform.scale(
+            scale: checkboxScaleFactor,
+            child: Checkbox.adaptive(
+              value: value,
+              onChanged: enabled ?? true ? onChanged : null,
+              mouseCursor: mouseCursor,
+              activeColor: activeColor,
+              fillColor: fillColor,
+              checkColor: checkColor,
+              hoverColor: hoverColor,
+              overlayColor: overlayColor,
+              splashRadius: splashRadius,
+              materialTapTargetSize: materialTapTargetSize ?? MaterialTapTargetSize.shrinkWrap,
+              autofocus: autofocus,
+              tristate: tristate,
+              shape: checkboxShape,
+              side: side,
+              isError: isError,
+              semanticLabel: checkboxSemanticLabel,
+            ),
           ),
         );
     }
diff --git a/packages/flutter/test/material/checkbox_list_tile_test.dart b/packages/flutter/test/material/checkbox_list_tile_test.dart
index 0b96de6162c..c32bacd9785 100644
--- a/packages/flutter/test/material/checkbox_list_tile_test.dart
+++ b/packages/flutter/test/material/checkbox_list_tile_test.dart
@@ -1266,6 +1266,49 @@ void main() {
     final Offset offsetPlatform = tester.getTopLeft(platform);
     expect(offsetPlatform, const Offset(736.0, 8.0));
   });
+
+  testWidgets('CheckboxListTile renders with default scale', (WidgetTester tester) async {
+    await tester.pumpWidget(const MaterialApp(
+      home: Material(
+        child: CheckboxListTile(
+          value: false,
+          onChanged: null,
+        ),
+      ),
+    ));
+
+    final Transform widget = tester.widget(
+      find.ancestor(
+        of: find.byType(Checkbox),
+        matching: find.byType(Transform),
+      ),
+    );
+
+    expect(widget.transform.getMaxScaleOnAxis(), 1.0);
+  });
+
+  testWidgets('CheckboxListTile respects checkboxScaleFactor', (WidgetTester tester) async {
+    const double scale = 1.5;
+
+    await tester.pumpWidget(const MaterialApp(
+      home: Material(
+        child: CheckboxListTile(
+          value: false,
+          onChanged: null,
+          checkboxScaleFactor: scale,
+        ),
+      ),
+    ));
+
+    final Transform widget = tester.widget(
+      find.ancestor(
+        of: find.byType(Checkbox),
+        matching: find.byType(Transform),
+      ),
+    );
+
+    expect(widget.transform.getMaxScaleOnAxis(), scale);
+  });
 }
 
 class _SelectedGrabMouseCursor extends MaterialStateMouseCursor {