81 lines
2.6 KiB
Dart
81 lines
2.6 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/cupertino.dart';
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/// Flutter code sample for [CupertinoMagnifier].
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void main() => runApp(const CupertinoMagnifierApp());
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class CupertinoMagnifierApp extends StatelessWidget {
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const CupertinoMagnifierApp({super.key});
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@override
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Widget build(BuildContext context) {
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return const CupertinoApp(
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theme: CupertinoThemeData(brightness: Brightness.light),
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home: CupertinoMagnifierExample(),
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);
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}
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}
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class CupertinoMagnifierExample extends StatefulWidget {
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const CupertinoMagnifierExample({super.key});
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@override
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State<CupertinoMagnifierExample> createState() =>
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_CupertinoMagnifierExampleState();
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}
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class _CupertinoMagnifierExampleState extends State<CupertinoMagnifierExample> {
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static const double magnifierRadius = 50.0;
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Offset dragGesturePosition = Offset.zero;
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@override
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Widget build(BuildContext context) {
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return CupertinoPageScaffold(
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navigationBar: const CupertinoNavigationBar(
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middle: Text('CupertinoMagnifier Sample'),
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),
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child: Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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const Text('Drag on the logo!'),
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RepaintBoundary(
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child: Stack(
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children: <Widget>[
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GestureDetector(
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onPanUpdate: (DragUpdateDetails details) {
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setState(() {
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dragGesturePosition = details.localPosition;
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});
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},
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onPanDown: (DragDownDetails details) {
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setState(() {
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dragGesturePosition = details.localPosition;
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});
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},
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child: const FlutterLogo(size: 200),
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),
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Positioned(
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left: dragGesturePosition.dx - magnifierRadius,
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top: dragGesturePosition.dy - magnifierRadius,
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child: const CupertinoMagnifier(
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magnificationScale: 1.5,
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borderRadius: BorderRadius.all(
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Radius.circular(magnifierRadius),
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),
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additionalFocalPointOffset: Offset(0, -magnifierRadius),
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),
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),
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],
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),
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),
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],
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),
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),
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);
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}
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}
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