66 lines
1.8 KiB
Dart
66 lines
1.8 KiB
Dart
import 'package:flutter/material.dart';
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import 'dart:io';
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/// Example of Capability and Policy classes
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/// for handling platform-specific behavior
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class CapabilityPolicyExample extends StatelessWidget {
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const CapabilityPolicyExample({super.key});
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(title: const Text('Capability & Policy Example')),
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body: Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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// Using Policy class for business logic
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if (Policy().shouldShowPurchaseButton())
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ElevatedButton(
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onPressed: () => Capability().openBrowser(),
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child: const Text('Buy in Browser'),
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)
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else
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const Text('Purchase not available on this platform'),
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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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/// Capability class - defines what the code CAN do
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class Capability {
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/// Check if browser is available
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bool hasBrowserCapability() {
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return Platform.isAndroid || Platform.isIOS || Platform.isMacOS;
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}
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/// Open browser (implementation depends on platform)
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void openBrowser() {
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if (hasBrowserCapability()) {
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// Launch browser implementation would go here
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print('Opening browser...');
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}
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}
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}
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/// Policy class - defines what the code SHOULD do
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class Policy {
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/// Policy: don't show purchase button on iOS
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bool shouldShowPurchaseButton() {
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return !Platform.isIOS;
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}
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/// Policy: use specific payment provider based on platform
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String getPaymentProvider() {
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if (Platform.isAndroid) {
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return 'Google Play';
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} else if (Platform.isIOS) {
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return 'Apple App Store';
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} else {
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return 'Web Payment';
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}
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}
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}
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