[material_ui] Move over more API samples

packages/material_ui/example/lib/material_state/material_state_outlined_border.0.dart

@@ -0,0 +1,60 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:material_ui/material_ui.dart';
+
+/// Flutter code sample for [WidgetStateOutlinedBorder].
+
+void main() => runApp(const WidgetStateOutlinedBorderExampleApp());
+
+class WidgetStateOutlinedBorderExampleApp extends StatelessWidget {
+  const WidgetStateOutlinedBorderExampleApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const MaterialApp(home: WidgetStateOutlinedBorderExample());
+  }
+}
+
+class SelectedBorder extends RoundedRectangleBorder
+    implements WidgetStateOutlinedBorder {
+  const SelectedBorder();
+
+  @override
+  OutlinedBorder? resolve(Set<WidgetState> states) {
+    if (states.contains(WidgetState.selected)) {
+      return const RoundedRectangleBorder();
+    }
+    return null; // Defer to default value on the theme or widget.
+  }
+}
+
+class WidgetStateOutlinedBorderExample extends StatefulWidget {
+  const WidgetStateOutlinedBorderExample({super.key});
+
+  @override
+  State<WidgetStateOutlinedBorderExample> createState() =>
+      _WidgetStateOutlinedBorderExampleState();
+}
+
+class _WidgetStateOutlinedBorderExampleState
+    extends State<WidgetStateOutlinedBorderExample> {
+  bool isSelected = true;
+
+  @override
+  Widget build(BuildContext context) {
+    return Material(
+      child: FilterChip(
+        label: const Text('Select chip'),
+        selected: isSelected,
+        onSelected: (bool value) {
+          setState(() {
+            isSelected = value;
+          });
+        },
+        shape: const SelectedBorder(),
+      ),
+    );
+  }
+}

packages/material_ui/example/lib/text_field/text_field_magnifier.0.dart

@@ -0,0 +1,107 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/foundation.dart';
+import 'package:material_ui/material_ui.dart';
+
+void main() => runApp(const TextMagnifierExampleApp(text: 'Hello world!'));
+
+class TextMagnifierExampleApp extends StatelessWidget {
+  const TextMagnifierExampleApp({
+    super.key,
+    this.textDirection = TextDirection.ltr,
+    required this.text,
+  });
+
+  final TextDirection textDirection;
+  final String text;
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: Padding(
+          padding: const .symmetric(horizontal: 48.0),
+          child: Center(
+            child: TextField(
+              textDirection: textDirection,
+              // Create a custom magnifier configuration that
+              // this `TextField` will use to build a magnifier with.
+              magnifierConfiguration: TextMagnifierConfiguration(
+                magnifierBuilder:
+                    (_, _, ValueNotifier<MagnifierInfo> magnifierInfo) =>
+                        CustomMagnifier(magnifierInfo: magnifierInfo),
+              ),
+              controller: TextEditingController(text: text),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class CustomMagnifier extends StatelessWidget {
+  const CustomMagnifier({super.key, required this.magnifierInfo});
+
+  static const Size magnifierSize = Size(200, 200);
+
+  // This magnifier will consume some text data and position itself
+  // based on the info in the magnifier.
+  final ValueNotifier<MagnifierInfo> magnifierInfo;
+
+  @override
+  Widget build(BuildContext context) {
+    // Use a value listenable builder because we want to rebuild
+    // every time the text selection info changes.
+    // `CustomMagnifier` could also be a `StatefulWidget` and call `setState`
+    // when `magnifierInfo` updates. This would be useful for more complex
+    // positioning cases.
+    return ValueListenableBuilder<MagnifierInfo>(
+      valueListenable: magnifierInfo,
+      builder: (BuildContext context, MagnifierInfo currentMagnifierInfo, _) {
+        // We want to position the magnifier at the global position of the gesture.
+        Offset magnifierPosition = currentMagnifierInfo.globalGesturePosition;
+
+        // You may use the `MagnifierInfo` however you'd like:
+        // In this case, we make sure the magnifier never goes out of the current line bounds.
+        magnifierPosition = Offset(
+          clampDouble(
+            magnifierPosition.dx,
+            currentMagnifierInfo.currentLineBoundaries.left,
+            currentMagnifierInfo.currentLineBoundaries.right,
+          ),
+          clampDouble(
+            magnifierPosition.dy,
+            currentMagnifierInfo.currentLineBoundaries.top,
+            currentMagnifierInfo.currentLineBoundaries.bottom,
+          ),
+        );
+
+        // Finally, align the magnifier to the bottom center. The initial anchor is
+        // the top left, so subtract bottom center alignment.
+        magnifierPosition -= Alignment.bottomCenter.alongSize(magnifierSize);
+
+        return Positioned(
+          left: magnifierPosition.dx,
+          top: magnifierPosition.dy,
+          child: RawMagnifier(
+            magnificationScale: 2,
+            // The focal point starts at the center of the magnifier.
+            // We probably want to point below the magnifier, so
+            // offset the focal point by half the magnifier height.
+            focalPointOffset: Offset(0, magnifierSize.height / 2),
+            // Decorate it however we'd like!
+            decoration: const MagnifierDecoration(
+              shape: StarBorder(
+                side: BorderSide(color: Colors.green, width: 2),
+              ),
+            ),
+            size: magnifierSize,
+          ),
+        );
+      },
+    );
+  }
+}