打开文件OK

win_text_editor/lib/app/widgets/text_tab.dart

@@ -2,17 +2,51 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:flutter/services.dart'; // 复制功能需要
 import 'package:win_text_editor/app/providers/editor_provider.dart';
+import 'package:file_picker/file_picker.dart';
+import 'dart:io'; // 用于文件操作
 
-class TextTab extends StatelessWidget {
+class TextTab extends StatefulWidget {
   final String tabId;
 
   const TextTab({super.key, required this.tabId});
 
   @override
-  Widget build(BuildContext context) {
-    final provider = Provider.of<EditorProvider>(context);
-    final tab = provider.tabs.firstWhere((t) => t.id == tabId);
+  State<TextTab> createState() => _TextTabState();
+}
+
+class _TextTabState extends State<TextTab> {
+  late TextEditingController _controller;
+  late EditorProvider _provider;
+
+  @override
+  void initState() {
+    super.initState();
+    _provider = Provider.of<EditorProvider>(context, listen: false);
+    _controller = TextEditingController(text: _getCurrentContent());
+  }
+
+  String _getCurrentContent() {
+    return _provider.tabs.firstWhere((t) => t.id == widget.tabId).content;
+  }
+
+  @override
+  void didUpdateWidget(TextTab oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.tabId != widget.tabId) {
+      _controller.text = _getCurrentContent();
+    }
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
 
+  @override
+  Widget build(BuildContext context) {
+    final tab = _provider.tabs.firstWhere((t) => t.id == widget.tabId); // Add this line
+    
     return Column(
       children: [
         // 新增工具条
@@ -26,23 +60,27 @@ class TextTab extends StatelessWidget {
           child: Row(
             mainAxisAlignment: MainAxisAlignment.spaceBetween,
             children: [
-              const Text('源文本', style: TextStyle(fontWeight: FontWeight.bold)),
+              Text(
+                '源文本${tab.content.isEmpty ? '' : ' (${tab.content.length}字符)'}',
+                style: const TextStyle(fontWeight: FontWeight.bold),
+              ),
               Row(
                 children: [
                   IconButton(
                     icon: const Icon(Icons.folder_open, size: 20),
                     tooltip: '打开文件',
-                    onPressed: () => _openFile(context, tabId),
+                    onPressed: () => _openFile(context),
                   ),
                   IconButton(
                     icon: const Icon(Icons.content_copy, size: 20),
                     tooltip: '复制内容',
-                    onPressed: () => _copyToClipboard(context, tab.content),
+                    onPressed:
+                        tab.content.isEmpty ? null : () => _copyToClipboard(context, tab.content),
                   ),
                   IconButton(
                     icon: const Icon(Icons.save, size: 20),
-                    tooltip: '保存文件',
-                    onPressed: () => _saveFile(context, tab.content),
+                    tooltip: '保存到文件',
+                    onPressed: tab.content.isEmpty ? null : () => _saveFile(context, tab.content),
                   ),
                 ],
               ),
@@ -52,12 +90,11 @@ class TextTab extends StatelessWidget {
         // 文本编辑区
         Expanded(
           child: TextField(
+            controller: _controller,
             maxLines: null,
-            controller: TextEditingController(text: tab.content),
-            onChanged: (text) => provider.updateContent(tabId, text),
+            onChanged: (text) => _provider.updateContent(widget.tabId, text),
             decoration: const InputDecoration(
               border: InputBorder.none,
-              hintText: '开始输入内容...',
               contentPadding: EdgeInsets.all(16),
             ),
           ),
@@ -66,14 +103,41 @@ class TextTab extends StatelessWidget {
     );
   }
 
-  // 打开文件模拟功能
-  Future<void> _openFile(BuildContext context, String tabId) async {
-    final provider = Provider.of<EditorProvider>(context, listen: false);
-    // 这里是模拟代码，实际应该使用文件选择器
-    const mockContent = "从文件加载的示例文本...";
-    provider.updateContent(tabId, mockContent);
+  // _openFile方法现在需要更新控制器
+  Future<void> _openFile(BuildContext context) async {
+    try {
+      final result = await FilePicker.platform.pickFiles(type: FileType.any, allowMultiple: false);
+
+      if (result != null && result.files.single.path != null) {
+        final file = File(result.files.single.path!);
+
+        // 尝试读取文件内容
+        final content = await file.readAsString();
 
-    ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('已加载文件内容')));
+        // 同时更新Provider和控制器
+        _provider.updateContent(widget.tabId, content);
+        setState(() {
+          _controller.text = content;
+        });
+
+        // 强制刷新文本控制器
+        if (context.mounted) {
+          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('已加载: ${file.path}')));
+        }
+      }
+    } on FormatException {
+      // 二进制文件错误
+      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('这不是可读的文本文件')));
+    } on FileSystemException catch (e) {
+      // 文件系统错误
+      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('文件访问错误: ${e.message}')));
+    } catch (e) {
+      if (context.mounted) {
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text('读取失败: ${e.toString()}')));
+      }
+    }
   }
 
   // 复制到剪贴板