flutter - 如何更改 flutter 中的文本选择选项？

Question

我尝试在 gmail 应用程序中添加文本编辑格式选项。但是当突出显示文本时，没有格式选项。是否可以处理选择警报？ (复制/剪切/粘贴)。或者有没有办法像gmail一样添加格式栏？

       TextField(
          controller: _categoryController,
          decoration: InputDecoration(
            border: InputBorder.none,
            hintText: "Enter Category Name",
          ),
        ),

我添加了屏幕截图和 gif 文件以更好地理解我的问题。

在我的 Flutter 应用程序上选择选项



在 Gmail 应用程序上选择选项

Answer 1

输出:



您可以检查以下代码:

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final _controller = new TextEditingController();
  final _textfieldFocusNode = new FocusNode();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Padding(
              padding: EdgeInsets.all(20.0),
              child: GestureDetector(
                // intercept all pointer calls
                behavior: HitTestBehavior.opaque,
                onTap: () {
                  FocusScope.of(context).requestFocus(_textfieldFocusNode);
                },
                onLongPress: () {
                  showMenu(
                    context: context,
                    // TODO: Position dynamically based on cursor or textfield
                    position: RelativeRect.fromLTRB(0.0, 300.0, 300.0, 0.0),
                    items: [
                      PopupMenuItem(
                        child: Row(
                          children: <Widget>[
                            // TODO: Dynamic items / handle click
                            PopupMenuItem(
                              child: Text(
                                "Paste",
                                style: Theme.of(context)
                                    .textTheme
                                    .body2
                                    .copyWith(color: Colors.red),
                              ),
                            ),
                            PopupMenuItem(
                              child: Text("Select All"),
                            ),
                          ],
                        ),
                      ),
                    ],
                  );
                },
                child: IgnorePointer(
                  // ensures textfield doesn't overrule GestureDetector
                  child: TextField(
                    focusNode: _textfieldFocusNode,
                    controller: _controller,
                  ),
                ),
              ),
            )
          ],
        ),
      ),
    );
  }
}