Optional RenderManager

example/ios/Flutter/AppFrameworkInfo.plist

@@ -21,6 +21,6 @@
   <key>CFBundleVersion</key>
   <string>1.0</string>
   <key>MinimumOSVersion</key>
-  <string>9.0</string>
+  <string>12.0</string>
 </dict>
 </plist>

example/ios/Runner.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 50;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -127,7 +127,7 @@
 		97C146E61CF9000F007C117D /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1300;
+				LastUpgradeCheck = 1510;
 				ORGANIZATIONNAME = "";
 				TargetAttributes = {
 					97C146ED1CF9000F007C117D = {
@@ -171,10 +171,12 @@
 /* Begin PBXShellScriptBuildPhase section */
 		3B06AD1E1E4923F5004D2608 /* Thin Binary */ = {
 			isa = PBXShellScriptBuildPhase;
+			alwaysOutOfDate = 1;
 			buildActionMask = 2147483647;
 			files = (
 			);
 			inputPaths = (
+				"${TARGET_BUILD_DIR}/${INFOPLIST_PATH}",
 			);
 			name = "Thin Binary";
 			outputPaths = (
@@ -185,6 +187,7 @@
 		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
+			alwaysOutOfDate = 1;
 			buildActionMask = 2147483647;
 			files = (
 			);
@@ -272,7 +275,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SUPPORTED_PLATFORMS = iphoneos;
@@ -350,7 +353,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -399,7 +402,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SUPPORTED_PLATFORMS = iphoneos;

example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1300"
+   LastUpgradeVersion = "1510"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

example/ios/Runner/Info.plist

@@ -45,5 +45,7 @@
 	<true/>
 	<key>CADisableMinimumFrameDurationOnPhone</key>
 	<true/>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
 </dict>
 </plist>

example/lib/main.dart

@@ -49,6 +49,7 @@ class _MyHomePageState extends State<MyHomePage> {
 
   final String _text0Id = 'text0Id';
   final String _text1Id = 'text1Id';
+  final String _text2Id = 'text2Id';
   final String _containerPositionedId = 'containerPositionedId';
   final String _textBlockId = 'textBlockId';
 
@@ -57,6 +58,7 @@ class _MyHomePageState extends State<MyHomePage> {
   bool _isOpacity = false;
 
   String _text0 = '';
+  String _text2 = 'No metrics';
 
   @override
   void initState() {
@@ -119,6 +121,15 @@ class _MyHomePageState extends State<MyHomePage> {
                         text: 'Metrics:\n\n$_text0',
                       ),
                     ),
+                    const SizedBox(height: 20),
+                    RenderMetricsObject(
+                      id: _text2Id,
+                      onMount: _onUpdate,
+                      onUpdate: _onUpdate,
+                      child: _TextContainer(
+                        text: 'Metrics without manager:\n\n$_text2',
+                      ),
+                    ),
                     const SizedBox(height: 1500),
                   ],
                 ),
@@ -160,6 +171,14 @@ class _MyHomePageState extends State<MyHomePage> {
       _isOpacity = isChange;
     });
   }
+
+  void _onUpdate(Object? id, RenderMetricsBox box) {
+    Future.delayed(const Duration(seconds: 1)).then((value) {
+      setState(() {
+        _text2 = box.data.toString();
+      });
+    });
+  }
 }
 
 class _TextContainer extends StatelessWidget {

lib/src/manager/render_parameters_manager.dart

@@ -28,13 +28,21 @@ class RenderParametersManager<T> extends RenderManager<T> {
   /// Add an instance of [RenderObject] by [id].
   @override
   void addRenderObject(T id, RenderObject renderObject) {
-    renderObjects[id] = renderObject as RenderMetricsBox;
+    if (renderObject is! RenderMetricsBox) {
+      return;
+    }
+
+    renderObjects[id] = renderObject;
   }
 
   /// Update an instance of [RenderObject] by [id].
   @override
   void updateRenderObject(T id, RenderObject renderObject) {
-    renderObjects[id] = renderObject as RenderMetricsBox;
+    if (renderObject is! RenderMetricsBox) {
+      return;
+    }
+
+    renderObjects[id] = renderObject;
   }
 
   /// Delete an instance of [RenderObject] by [id].

lib/src/render/render_metrics.dart

@@ -40,15 +40,15 @@ typedef UnMountCallback<T> = void Function(T id);
 class RenderMetricsObject<T> extends SingleChildRenderObjectWidget {
   const RenderMetricsObject({
     required this.id,
-    required this.manager,
+    this.manager,
     this.onMount,
     this.onUpdate,
     this.onUnMount,
     Key? key,
     Widget? child,
   }) : super(key: key, child: child);
   final T id;
-  final RenderManager manager;
+  final RenderManager? manager;
   final MountCallback<T>? onMount;
   final MountCallback<T>? onUpdate;
   final UnMountCallback<T>? onUnMount;
@@ -57,7 +57,7 @@ class RenderMetricsObject<T> extends SingleChildRenderObjectWidget {
   RenderMetricsBox createRenderObject(BuildContext context) {
     final r = RenderMetricsBox();
     onMount?.call(id, r);
-    manager.addRenderObject(id, r);
+    manager?.addRenderObject(id, r);
     return r;
   }
 
@@ -68,13 +68,13 @@ class RenderMetricsObject<T> extends SingleChildRenderObjectWidget {
   ) {
     if (renderObject is RenderMetricsBox) {
       onUpdate?.call(id, renderObject);
-      manager.updateRenderObject(id, renderObject);
+      manager?.updateRenderObject(id, renderObject);
     }
   }
 
   @override
   void didUnmountRenderObject(covariant RenderObject renderObject) {
-    manager.removeRenderObject(id);
+    manager?.removeRenderObject(id);
     onUnMount?.call(id);
   }
 }
@@ -86,6 +86,7 @@ class RenderMetricsBox extends RenderProxyBox {
   RenderMetricsBox({
     RenderBox? child,
   }) : super(child);
+
   RenderData get data {
     final size = this.size;
     final width = size.width;

pubspec.yaml

@@ -15,7 +15,7 @@ dev_dependencies:
   surf_lint_rules: ^1.0.0
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.12.0 <4.0.0"
 
 flutter:
     uses-material-design: true