基础功能

lib/pages/note_form_page.dart

@@ -0,0 +1,187 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import '../providers/app_provider.dart';
+import '../models/data_models.dart';
+
+/// 添加/编辑笔记页面
+class NoteFormPage extends StatefulWidget {
+  final Note? note; // 如果为 null，则是添加模式；否则是编辑模式
+
+  const NoteFormPage({super.key, this.note});
+
+  @override
+  State<NoteFormPage> createState() => _NoteFormPageState();
+}
+
+class _NoteFormPageState extends State<NoteFormPage> {
+  final _formKey = GlobalKey<FormState>();
+  late TextEditingController _titleController;
+  late TextEditingController _contentController;
+  late TextEditingController _tagsController;
+
+  @override
+  void initState() {
+    super.initState();
+    _titleController = TextEditingController(text: widget.note?.title ?? '');
+    _contentController = TextEditingController(text: widget.note?.content ?? '');
+    _tagsController = TextEditingController(
+      text: widget.note?.tags.join(', ') ?? '',
+    );
+  }
+
+  @override
+  void dispose() {
+    _titleController.dispose();
+    _contentController.dispose();
+    _tagsController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final isEdit = widget.note != null;
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(isEdit ? '编辑笔记' : '添加笔记'),
+        actions: [
+          IconButton(
+            icon: const Icon(Icons.save),
+            onPressed: _saveNote,
+          ),
+        ],
+      ),
+      body: SingleChildScrollView(
+        padding: const EdgeInsets.all(16),
+        child: Form(
+          key: _formKey,
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              // 标题
+              TextFormField(
+                controller: _titleController,
+                decoration: const InputDecoration(
+                  labelText: '标题 *',
+                  hintText: '请输入笔记标题',
+                  prefixIcon: Icon(Icons.title),
+                  border: OutlineInputBorder(),
+                ),
+                validator: (value) {
+                  if (value == null || value.trim().isEmpty) {
+                    return '请输入标题';
+                  }
+                  return null;
+                },
+              ),
+
+              const SizedBox(height: 16),
+
+              // 标签
+              TextFormField(
+                controller: _tagsController,
+                decoration: const InputDecoration(
+                  labelText: '标签',
+                  hintText: '多个标签用逗号分隔',
+                  prefixIcon: Icon(Icons.local_offer),
+                  border: OutlineInputBorder(),
+                ),
+              ),
+
+              const SizedBox(height: 16),
+
+              // 内容
+              TextFormField(
+                controller: _contentController,
+                decoration: const InputDecoration(
+                  labelText: '内容 *',
+                  hintText: '请输入笔记内容...',
+                  prefixIcon: Icon(Icons.edit_note),
+                  border: OutlineInputBorder(),
+                  alignLabelWithHint: true,
+                ),
+                maxLines: 15,
+                validator: (value) {
+                  if (value == null || value.trim().isEmpty) {
+                    return '请输入内容';
+                  }
+                  return null;
+                },
+              ),
+
+              const SizedBox(height: 32),
+
+              // 保存按钮
+              SizedBox(
+                width: double.infinity,
+                height: 48,
+                child: ElevatedButton.icon(
+                  onPressed: _saveNote,
+                  icon: const Icon(Icons.save),
+                  label: Text(isEdit ? '保存修改' : '添加笔记'),
+                  style: ElevatedButton.styleFrom(
+                    shape: RoundedRectangleBorder(
+                      borderRadius: BorderRadius.circular(8),
+                    ),
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  /// 保存笔记
+  Future<void> _saveNote() async {
+    if (!_formKey.currentState!.validate()) {
+      return;
+    }
+
+    // 解析标签
+    final tags = _tagsController.text
+        .split(',')
+        .map((tag) => tag.trim())
+        .where((tag) => tag.isNotEmpty)
+        .toList();
+
+    if (widget.note == null) {
+      // 添加新模式
+      final now = DateTime.now();
+      final newNote = Note(
+        id: now.millisecondsSinceEpoch.toString(),
+        title: _titleController.text.trim(),
+        content: _contentController.text.trim(),
+        tags: tags,
+        createdAt: now,
+        updatedAt: now,
+      );
+
+      await context.read<AppProvider>().addNote(newNote);
+    } else {
+      // 编辑现有模式
+      final updatedNote = Note(
+        id: widget.note!.id,
+        title: _titleController.text.trim(),
+        content: _contentController.text.trim(),
+        tags: tags,
+        createdAt: widget.note!.createdAt,
+        updatedAt: DateTime.now(),
+      );
+
+      await context.read<AppProvider>().updateNote(updatedNote);
+    }
+
+    if (!mounted) return;
+
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(widget.note == null ? '添加成功' : '更新成功'),
+        behavior: SnackBarBehavior.floating,
+      ),
+    );
+
+    Navigator.pop(context);
+  }
+}