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Lemon Grab
Asked: 2024-11-21 07:02:36 +0800 CST

溢出其父母的孩子不会收到水龙头检测

  • 772

我遇到一个问题，当我使用堆栈并添加一个具有手势检测器的子项并将其放置在父窗口小部件之外时，使用定位它不再检测手势，如果有修复程序，请解释一下，谢谢。我针对该问题的代码：

...List<Widget>.generate(
            images.length,
            (index) {
              return Stack(
                clipBehavior: Clip.none,
                children: [
                  Container(
                    height: deviceWidth / 3.5,
                    width: deviceWidth / 3.5,
                    clipBehavior: Clip.antiAlias,
                    decoration: BoxDecoration(
                        borderRadius: BorderRadius.circular(10)),
                    child: GestureDetector(
                      onLongPressStart: (details) {},
                      onTap: () async {
                        var imageFile = await pickImage();
                        if (imageFile != null) {
                          images[index] = makeImage(
                              isPlaceholder: false,
                              imageData: await imageFile.readAsBytes());
                          setState(
                            () {},
                          );
                        }
                      },
                      child: images[index],
                    ),
                  ),
                  Positioned(
                    left: -10,
                    top: -15,
                    child: Container(
                      alignment: Alignment.center,
                      height: 30,
                      width: 30,
                      decoration: const ShapeDecoration(
                          shape: CircleBorder(), color: Colors.red),
                      child: InkWell(
                        splashColor: Colors.white,
                        onTap: () {
                          images.remove(images[index]);
                          setState(() {});
                        },
                        child: const IgnorePointer(
                            child: Icon(Icons.delete_forever)),
                      ),
                    ),
                  )
                ],
              );
            },
          ),
flutter

1 个回答

  1. Best Answer

    此行为是故意的。框架从父级到子级，默认情况下，当子级在父级框外时，hitTest小部件不允许子级接收。hitTest

    要实现溢出子元素的“框外”手势检测。您可以将溢出的子元素推到Overlay，OverlayPortal并将其定位在LayerLink。

    import 'package:flutter/material.dart';

main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('LayerLink'),
        ),
        body: const Center(child: Home()),
      ),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return const Padding(
      padding: EdgeInsets.all(20.0),
      child: Wrap(
        spacing: 10.0,
        runSpacing: 10.0,
        children: [
          MyImage(color: Colors.blue),
          MyImage(color: Colors.green),
          MyImage(color: Colors.yellow),
          MyImage(color: Colors.orange),
          MyImage(color: Colors.purple),
          MyImage(color: Colors.red),
          MyImage(color: Colors.pink),
          MyImage(color: Colors.teal),
          MyImage(color: Colors.brown),
          MyImage(color: Colors.grey),
        ],
      ),
    );
  }
}

class MyImage extends StatefulWidget {
  const MyImage({super.key, required this.color});
  final Color color;

  @override
  State<MyImage> createState() => _MyImageState();
}

class _MyImageState extends State<MyImage> {
  int count = 0;
  final controller = OverlayPortalController();
  final link = LayerLink();

  @override
  void initState() {
    super.initState();
    controller.show();
  }

  @override
  Widget build(BuildContext context) {
    return OverlayPortal(
      controller: controller,
      child: CompositedTransformTarget(
        link: link,
        child: Container(
          color: widget.color,
          height: 100,
          width: 100,
          alignment: Alignment.center,
          child: Text(
            "$count",
            style: const TextStyle(fontSize: 30),
          ),
        ),
      ),
      overlayChildBuilder: (context) {
        return Center(
          child: CompositedTransformFollower(
            link: link,
            followerAnchor: Alignment.center,
            showWhenUnlinked: false,
            child: Container(
              alignment: Alignment.center,
              height: 30,
              width: 30,
              decoration: const ShapeDecoration(shape: CircleBorder(), color: Colors.red),
              child: InkWell(
                splashColor: Colors.white,
                onTap: () {
                  setState(() {
                    count++;
                  });
                },
                child: const IgnorePointer(child: Icon(Icons.delete_forever)),
              ),
            ),
          ),
        );
      },
    );
  }
}
    • 1

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