CODEWITHSUNDEEP
dartflutterflutter-layout
JC23
JC23

Reputation: 1328

Flutter - How to get Container with children to take up entire screen

As per Flutter docs Containers with no children try to be as big as possible unless the incoming constraints are unbounded, in which case they try to be as small as possible. Containers with children size themselves to their children. The closest I've been to getting it to work:

return Stack(
  children: <Widget>[
    Container(
      width: MediaQuery.of(context).size.width,
      height: MediaQuery.of(context).size.height,
      //width: Device.screenWidth,
      //height: Device.screenHeight,
      child: Column(
        children: <Widget>[(view[1])],
      ),
    ),
    Container(
      width: MediaQuery.of(context).size.width * .50,
      height: MediaQuery.of(context).size.width * .50,
      child: Column(
        children: <Widget>[(view[0])],
      ),
    ),
  ],
);


I/flutter (12292): The following message was thrown during layout:
I/flutter (12292): A RenderFlex overflowed by 81 pixels on the bottom.
I/flutter (12292): The overflowing RenderFlex has an orientation of Axis.vertical.
I/flutter (12292): The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
I/flutter (12292): black striped pattern. This is usually caused by the contents being too big for the RenderFlex.

Can't understand why MediaQuery or Device isn't preventing overflow? The first Container always overflows by 81 pixels on both an Android phone or tablet; no iPhone or iPad to test now. Based on what I've read from other posts overflow with yellow & black is corrected simply by wrapping in a SingleChildScrollView but when I attempt to do so I get

child: SingleChildScrollView(
        child: Column(
          children: <Widget>[(view[1])],
        ),
      ),

I/flutter (12292): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (12292): The following assertion was thrown during performLayout():
I/flutter (12292): RenderFlex children have non-zero flex but incoming height constraints are unbounded.
I/flutter (12292): When a column is in a parent that does not provide a finite height constraint, for example if it is
I/flutter (12292): in a vertical scrollable, it will try to shrink-wrap its children along the vertical axis. Setting a
I/flutter (12292): flex on a child (e.g. using Expanded) indicates that the child is to expand to fill the remaining
I/flutter (12292): space in the vertical direction.
I/flutter (12292): These two directives are mutually exclusive. If a parent is to shrink-wrap its child, the child
.
.
.
I/flutter (12292):   crossAxisAlignment: center
I/flutter (12292):   verticalDirection: down
I/flutter (12292): This RenderObject had the following child:
I/flutter (12292):   RenderAndroidView#e356e NEEDS-LAYOUT NEEDS-PAINT

Made several other attempts with Expanded, ClipRect & other widgets based on the errors I've seen but it just made it worse where there was no image at all. Am I missing something simple or should I attempt to fix this another way?

EDIT: As per Amsakanna the latest attempt is below but still overflows by 81 pixels to produce identical error message above in the first code block.

return Stack(
  children: <Widget>[
    SingleChildScrollView(
      child: Container(
        width: MediaQuery.of(context).size.width,
        height: MediaQuery.of(context).size.height,
        child: Column(
          children: <Widget>[view[1])],
        ),
      ),
    ),

I/flutter ( 1144): The following message was thrown during layout:
I/flutter ( 1144): A RenderFlex overflowed by 81 pixels on the bottom.
I/flutter ( 1144): The overflowing RenderFlex has an orientation of Axis.vertical.
I/flutter ( 1144): The edge of the RenderFlex that is overflowing has been marked in the rendering with a yellow and
I/flutter ( 1144): black striped pattern. This is usually caused by the contents being too big for the RenderFlex.

Tried to use IntrinsicHeight inside SingleChildScrollView as found here in the Expanding content to fit the viewport section but it overflows too (by 81 pixels) with similar error message.

Upvotes: 30

Views: 110107

Answers (8)

user2131694
user2131694

Reputation: 11

wrap your content inside a Positioned.fill

Positioned.fill(
      child: Visibility(
        child: Container(
          color: Colors.black54,
          child: Center(child: PRLoader(),))
        ),
    )

Upvotes: 1

Dinith
Dinith

Reputation: 1029

wrap the Container with SizedBox.expand and add colors in SizedBox.

Upvotes: 1

Saddan
Saddan

Reputation: 1655

if you want to make a container height as much as its child take you may use this approach.

     Card(
           
            child: Flexible(
              child: Container(
                
                child: Column(
                  children: [
                    Container(
                      height: 30,
                      width: double.infinity,
                      color: Theme.of(context).primaryColor,
                        child: Align(
                              alignment: Alignment.centerLeft,
                              child: Container(
                                  margin: EdgeInsets.only(left: 5),
                                  child: Text('Presupuesto Por Profesional',style: 
                  TextStyle(color: Colors.white, fontSize: 16,fontWeight: 
                FontWeight.bold)),
                              )
                        )
                ),
                    ProfessionalTableView(reportData.presupuestos)
                  ],
                ),
              ),
            )
          ),

My ProfessionalTableView is a dataTable and its length depends upon the size of the list I pass it. So the card size also depends upon the item I have in list.I wrap the parent Container with Flexible and it work.

Upvotes: 0

Haritha Madhushanka
Haritha Madhushanka

Reputation: 257

Wrap the Container with a SingleChildScrollView() and give the container the height and width using MediaQuery. I could achieve the results using this way. This way, the screen doesn't overflow by any pixels.

return Scaffold(
  body: SingleChildScrollView(
    child: Container(
      height: MediaQuery.of(context).size.height,
      width: MediaQuery.of(context).size.width,
      child: , //child 
    ),
  ),
);

Upvotes: 2

Nikhil Chigali
Nikhil Chigali

Reputation: 119

My approach...

return Scaffold(
      appBar: AppBar(
        title: Text('Title'),
      ),
      body: Container(
        color: Colors.indigo[200],
        alignment: Alignment.center,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Container(
              child: Image.file(_image),
            ),
          ],
        ),
      ),
    );

Upvotes: 11

Raghib Arshi
Raghib Arshi

Reputation: 755

It works for me..

return Scaffold(
              appBar: AppBar(
                title: Text("chatEasy"),
                backgroundColor: Color.fromRGBO(102, 108, 218, 1),
              ),
              body: Container(
                child: Column(
                  children: <Widget>[
                    Expanded(
                      child: Container(
                        child: Image(
                          image: AssetImage("images/baseScreen.png"),
                          fit: BoxFit.fitHeight,
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            );
          }
        }

Upvotes: 2

AlanKley
AlanKley

Reputation: 4780

SizedBox.expand did it for me. Here is an example of displaying an image so that the image height matches the parent and the container draws a black background in the unused space:

  SizedBox.expand(
    child: Container(
      color: Colors.black,
      child: Image (
        fit: BoxFit.fitHeight,
        image: AssetImage('assets/myimage.png'),
      ),
    ),
  );

Upvotes: 56

Amsakanna
Amsakanna

Reputation: 12934

You did it right by wrapping it inside a SingleChildScrollView.

The second error happens whenever you have a flex widget like 'Expanded' is placed inside a Column. If you did not place any expanded widget inside the first Column, probably it is the Camera widget doing that.

Try giving a definite size to your Camera widget by wrapping it inside a Container or SizedBox.

Upvotes: 0

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