adding packages

2026-01-15 14:38:46 -08:00
parent ef86e3ab6a
commit 6869cf47e5
5253 changed files with 726695 additions and 34 deletions
@@ -0,0 +1,98 @@
+# undo_example
+
+Demonstrates how to use the undo plugin.
+
+## Example
+
+```dart
+import 'package:flutter/material.dart';
+
+import 'package:undo/undo.dart';
+
+void main() => runApp(MyApp());
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      theme: ThemeData.light(),
+      darkTheme: ThemeData.dark(),
+      debugShowCheckedModeBanner: false,
+      home: HomeScreen(),
+    );
+  }
+}
+
+class HomeScreen extends StatefulWidget {
+  @override
+  _HomeScreenState createState() => _HomeScreenState();
+}
+
+class _HomeScreenState extends State<HomeScreen> {
+  SimpleStack _controller;
+
+  @override
+  void initState() {
+    _controller = SimpleStack<int>(
+      0,
+      onUpdate: (val) {
+        if (mounted)
+          setState(() {
+            print('New Value -> $val');
+          });
+      },
+    );
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final count = _controller.state;
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('Undo/Redo Example'),
+      ),
+      body: Center(
+        child: Text('Count: $count'),
+      ),
+      bottomNavigationBar: BottomAppBar(
+        child: Row(
+          children: <Widget>[
+            IconButton(
+              icon: Icon(Icons.arrow_back),
+              onPressed: !_controller.canUndo
+                  ? null
+                  : () {
+                      if (mounted)
+                        setState(() {
+                          _controller.undo();
+                        });
+                    },
+            ),
+            IconButton(
+              icon: Icon(Icons.arrow_forward),
+              onPressed: !_controller.canRedo
+                  ? null
+                  : () {
+                      if (mounted)
+                        setState(() {
+                          _controller.redo();
+                        });
+                    },
+            ),
+          ],
+        ),
+      ),
+      floatingActionButtonLocation: FloatingActionButtonLocation.endDocked,
+      floatingActionButton: FloatingActionButton(
+        heroTag: ValueKey('add_button'),
+        child: Icon(Icons.add),
+        onPressed: () {
+          _controller.modify(count + 1);
+        },
+      ),
+    );
+  }
+}
+
+```