Flutter- GestureDetector not working with containers in stack

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

Try setting the behavior property of GestureDetector to HitTestBehavior.translucent.

Answer 2

Using InkWell instead of GestureDetector solved my problem.

Answer 3

You should try wrap your Container with an AbsorbPointer.

GestureDetector(
   child: AbsorbPointer(
      child: Container(...)
   )
)

Answer 4

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 5

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 6

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

Solution:

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

Answer 7

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 8

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 9

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 10

For others coming to this post, another thing that can cause this issue is an AbsorbPointer higher is the hierarchy.

Answer 11

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 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

For my case, I placed the GestureDetector inside the Stack which created the same problem. I solved it by making the parent Stack into a child of the GestureDetector .

Before -

Stack(
    children: [
    GestureDetector()
    ])

After -

GestureDetector(
    child: 
    Stack()
   )

Answer 14

Keep your gesture detector as the last child in the stack that means it will be on the top front like below;

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

if its at the back of another child then the overlapping child prevents it from being clicked somehow

Answer 15

OnTap does not work outside the first childrens area in stack. So put everything inside a container and give it a height and width and make it a first child.

Answer 16

1. The click is invalid because your widget is beyond the scope of Stack

2. Use ConstrainedBox to fill the stack with screen

class MyHomePage extends StatefulWidget {
   final String title;
   const MyHomePage({Key? key, required this.title}) : super(key: key);
    @override
    State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
    @override
    Widget build(BuildContext context) {
        return Scaffold(
             appBar: AppBar(
                title: Text(widget.title),
             ),
             body: ConstrainedBox(
                    constraints: BoxConstraints.expand(),
                    child: Stack(
                      children: [
                        Positioned(
                          right: 100,
                          bottom: 100,
                          child: GestureDetector(
                            behavior: HitTestBehavior.translucent,
                            onTap: () {
                              debugPrint("hello");
                              showDialog(context: context, builder: ((context) => Text("dialog")));
                            },
                            child: Container(
                                child: Text("123"),
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                );
              }
}

Answer 17

Use Inkwell instead of GestureDetector

Answer 18

@Michel Fortes' AbsorbPointer() solution worked for me, even with Stack() as one of the descendants.

Prior to this I had tried modifying the GestureDetector.behavior to HitTestBehavior.transluscent, using Inkwell() instead, and wrapping different widgets in the tree. I also tried using RawGestureDetector().

Nothing worked until AbsorbPointer():

GestureDetector(
   child: AbsorbPointer(
      child: Container(...) // or any Material widget, even if descendants include a Stack() 
      )
)

Answer 19

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.