manta/win_text_editor/lib/app/app.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:win_text_editor/app/menus/app_menu.dart';
import 'package:win_text_editor/app/providers/editor_provider.dart';
import 'package:win_text_editor/app/providers/file_provider.dart';
import 'package:win_text_editor/app/widgets/editor_pane.dart';
import 'package:win_text_editor/app/widgets/file_explorer.dart';

class AppScaffold extends StatelessWidget {
  const AppScaffold({super.key});

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (_) => FileProvider()),
        ChangeNotifierProvider(create: (_) => EditorProvider()),
      ],
      child: const Scaffold(
        body: Column(
          children: [
            // 菜单栏
            AppMenu(),
            // 主内容区域
            Expanded(
              child: _ResizablePanel(),
            ),
          ],
        ),
      ),
    );
  }
}

class _ResizablePanel extends StatefulWidget {
  const _ResizablePanel();

  @override
  State<_ResizablePanel> createState() => _ResizablePanelState();
}

class _ResizablePanelState extends State<_ResizablePanel> {
  double _leftWidth = 0.2; // 初始宽度20%
  final double _minWidth = 100; // 最小宽度
  final double _maxWidth = 400; // 最大宽度

  @override
  Widget build(BuildContext context) {
    final screenWidth = MediaQuery.of(context).size.width;

    return LayoutBuilder(
      builder: (context, constraints) {
        // 计算实际宽度
        final leftPanelWidth = (_leftWidth * screenWidth).clamp(_minWidth, _maxWidth);

        return Row(
                children: [
                  // 左侧文件资源管理器
            SizedBox(
              width: leftPanelWidth,
              child: const FileExplorer(),
            ),
            // 拖拽手柄
            GestureDetector(
              behavior: HitTestBehavior.translucent,
              onPanUpdate: (details) {
                setState(() {
                  _leftWidth = ((leftPanelWidth + details.delta.dx) / screenWidth)
                      .clamp(_minWidth / screenWidth, _maxWidth / screenWidth);
                });
              },
              child: MouseRegion(
                cursor: SystemMouseCursors.resizeLeftRight,
                child: Container(
                  width: 4,
                  color: Colors.grey[300],
              ),
            ),
        ),
            // 右侧编辑器区域
            Expanded(
              child: const EditorPane(),
      ),
          ],
        );
      },
    );
  }
}