Flutter-GestureDetector 不适用于堆栈中的容器

Question

I have two containers in a stack and both containers have GestureDetector.The OnTap for the first container is working fine but it's not working with another container. The first container is the image and the second one is the green background aligned partially over the first container.

new Stack(
            alignment: Alignment(0.0, 1.44),
            children: <Widget>[
              GestureDetector(
                onTap: () => _openImage(context),
                child: Container(
                  width: 340.0,
                  foregroundDecoration: new BoxDecoration(
                      color: Color.fromRGBO(155, 85, 250, 0.55)),
                  height: 240.0,
                  child: FadeInImage.assetNetwork(
                    placeholder: 'assets/dimlight.png',
                    image: post.imageUrl,
                    fit: BoxFit.cover,
                  ),
                ),
              ),
              new GestureDetector(
                child: new Container(
                  color: Colors.green,
                  child: Row(
                    mainAxisSize: MainAxisSize.max,
                    children: <Widget>[
                      SizedBox(width: 7.0),
                      CircleAvatar(
                        backgroundImage: 
                           new AssetImage("assets/boy.png")
                        radius: 30.0,
                      ),
                      SizedBox(
                        width: 7.0,
                      ),
                      Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: <Widget>[
                          new SizedBox(
                            height: 20.0,
                          ),
                          Text(
                            post.user.name,
                            style: TextStyle(fontWeight: FontWeight.bold),
                          ),
                          Text(
                            getTimeString(post.timestamp.toString()),
                            style: TextStyle(
                                color: Colors.grey, fontSize: 10.0),
                          ),
                        ],
                      ),
                      SizedBox(
                        width: 20.0,
                      ),
                    ],
                  ),
                ),
                onTap: () => _navigateToDetails(context),
              )
            ],
          )

Layout Screenshot

Answer 1

尝试将GestureDetector的behavior属性设置为HitTestBehavior.translucent 。

Answer 2

使用InkWell而不是GestureDetector解决了我的问题。

Answer 3

For me it was an issue with items overflowing outside a Stack , with clipBehavior: Clip.none .

In that case the item is visible but not touchable. So I updated my layout to remove the clipBehavior: Clip.none on my Stack and the GestureDetector started working. 🎉

Answer 4

In my case I had a CustomPainter inside the stack. Nothing of the above was working, until I gave the CustomerPainter a size. It was showing without explicitly giving a size, but no tap events were triggered:

Container(
      child: CustomPaint(
    size: Size(30, 30),
    painter: RecordingButton(30),
  ))

Answer 5

您应该尝试使用 AbsorbPointer 包装您的 Container。

Answer 6

i think that your widgets are overlapping each other and that the causing a problem. you can check it by wrapping your GestureDetector with container and provide color to get better understanding.

your code is not enough that's why i added following example may help you to understand more clearly.

swap the position of GestureDetector in example and you can found that in first case it prints only second and in other case if you click in above part then it prints first to.

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Firebase Auth Demo',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Card(
        margin: EdgeInsets.all(40.0),
        child: new Column(
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            GestureDetector(
              onTap: () => print("first container"),
              child: Container(
                width: 340.0,
                foregroundDecoration: new BoxDecoration(
                    color: Color.fromRGBO(155, 85, 250, 0.0)),
                height: 240.0,
                child: FadeInImage.assetNetwork(
                  placeholder: 'images/p1.png',
                  image:
                  "https://www.straitstimes.com/sites/default/files/styles/article_pictrure_780x520_/public/articles/2016/06/15/ST_20160615_LLIMH_2368135.jpg?itok=8Dggu2PM&timestamp=1465926004",
                  fit: BoxFit.cover,
                ),
              ),
            ),
            new GestureDetector(
              child: new Container(
                foregroundDecoration: BoxDecoration(
                    color: Color.fromRGBO(155, 85, 250, 0.4)),
                child: Row(
                  mainAxisSize: MainAxisSize.max,
                  children: <Widget>[
                    SizedBox(width: 7.0),
                    CircleAvatar(
                      backgroundImage: new AssetImage("images/p2.jpg"),
                      radius: 30.0,
                    ),
                    SizedBox(
                      width: 7.0,
                    ),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: <Widget>[
                          new SizedBox(
                            height: 20.0,
                          ),
                          Text(
                            "sfvgefbv",
                            style: TextStyle(fontWeight: FontWeight.bold),
                          ),
                          Text(
                            "sfvmsfkv",
                            style: TextStyle(
                                color: Colors.grey, fontSize: 10.0),
                          ),
                        ],
                      ),
                    ),
                    new Container(
                      alignment: AlignmentDirectional.centerEnd,
//            todo add here check if not logged in then ask to
                      child: Row(
                        mainAxisSize: MainAxisSize.min,
                        mainAxisAlignment: MainAxisAlignment.start,
                        children: <Widget>[
                          IconButton(
                              icon: Icon(
                                Icons.comment,
                                color: Colors.green,
                              ),
                              onPressed: () => print("message click")),
                          Text(
                            "2",
                            style: TextStyle(
                              color: Colors.green,
                            ),
                          ),
                          SizedBox(
                            width: 10.0,
                          )
                        ],
                      ),
                    ),
                  ],
                ),
              ),
              onTap: () => print("this is second container"),
            ),
            new Expanded(
              child: Container(
                padding: EdgeInsets.all(10.0),
                child: Column(
                  children: <Widget>[
                    Text(
                      "fsvkmfskbnmkffvberk",
                      style: TextStyle(
                          color: Colors.green, fontWeight: FontWeight.bold),
                    ),
                    new Text(
                      "svklmfslkbnernkjrnvkrwjnvrw",
                      maxLines: 6,
                      overflow: TextOverflow.ellipsis,
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Answer 7

Because of stack ..There are some widget on your GestureDetector .

Solution:

Stack(
        children: <Widget>[
              ...//Other widgets,
              GestureDetector()
        ]

Answer 8

对于其他人来到这篇文章，另一个可能导致此问题的原因是层次结构更高的 AbsorbPointer。

Answer 9

Another GestureDetector in the BuildContext tree

Ok on my side it was quite stupid but since it may happens to many of us I will explain:

My build context (simplified for the example) tree was this way:

Widget build(BuildContext context) {

return (...) (
    child: GestureDetector(
        onTap: () => _myFunction(),
        child: Container(
            height: 64.0,
            width: 128.0,
            child: (...)

Seems legit right? But then I inspected into more details the bottom of my tree:

(...)
        onTap: () => _myFunction(),
        child: Container(
            height: 64.0,
            width: 128.0,
            child: TheSourceOfEvil() // <-- whoopsie!

Quickly inspected TheSourceOfEvil to find out that the culprit was in fact ANOTHER GestureDetector has a child, that I had not yet implemented onTap: () => {}, :

Widget TheSourceOfEvil( {

return (...) (
    child: GestureDetector(
        onTap: () => {}, // override previous GestureDetector
        child: Container(
            child: (...);

Got rid of it and it instantly fixed my puzzling issue. I hope it will help!

Answer 10

If your are using GoogleMap widget and want to add a searchfield/textfield you should be aware that the map widget is consuming your gestures. I do something like this:

final FocusNode _focusNode = new FocusNode();

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      behavior: HitTestBehavior.translucent,
      onTap: () {            
        print("tap");
        if (_focusNode.hasPrimaryFocus) {
          _focusNode.unfocus();
          rebuildAfterFocusChange();
        }
      },
      child: Stack(children: [
        AbsorbPointer(absorbing: _focusNode.hasPrimaryFocus, child: StoreMapView()),
        showSearchField(model),
      ]),
    );
  }

Widget showSearchField(StoreFinderViewModel model) {
    return SafeArea(
      child: Padding(
        padding: const EdgeInsets.only(left: 8.0, right: 8.0, top: 12.0),
        child: TextField(
          onTap: () {
            rebuildAfterFocusChange();
          },
          onSubmitted: (String input) {
            rebuildAfterFocusChange();
            // do other stuff
            });
          },
          focusNode: _focusNode,
        ),
      ),
    );
  }

  void rebuildAfterFocusChange() {
    setState(() {});
  }

I am using the AbsorbPointer widget to absorb the clicks/taps, but ONLY if my textfield has the focus. I call my rebuildAfterFocusChange(); if I tap on my "Searchfield", use the onsubmit method of the textfield to trigger a search in my backend and after I unfocus my textfield.

Answer 11

Also consider Listener widget. It helped me.
https://api.flutter.dev/flutter/widgets/Listener-class.html
Example:

Listener(
    onPointerDown: (_) {}, // onTapDown
    onPointerUp: (_) => {}, // onTapUp
    child: Container(),
)

Answer 12

Okay here's the deal, I just changed the position of the widgets. In Stack Everything is like a Tree index.

Stack Parent
  └ Child One    [Far Back]
  └ Child Two
  └ Child Three  [Top Front]

My Code:

     return Stack(
              children: [
                accountInfo(),   // this is not clickable
                chatMessages(),
                typingArea(),
              ],
            ),

I just changes the sequence

    return Stack(
              children: [
                chatMessages(),
                typingArea(),
                accountInfo(), // Now this is clickable by any of onTap Event ad
              ],
            ),

Answer 13

I see that you are calling the callback method instead of assigning it to onTap property of GestureDetector widget. Pass the name of the method don't call it there.