CODEWITHSUNDEEP
flutterdartflutter-layout
Julien
Julien

Reputation: 4183

Flutter: How to change the width of an AlertDialog?

I wonder how to change the default width of an AlertDialog, I only succeeded to change the border radius :

Here is my code :

showDialog(
       context: context,
       builder: (_) =>
            new AlertDialog(
               shape: RoundedRectangleBorder(
                   borderRadius: BorderRadius.all(Radius.circular(10.0))
               ),
               content: ProductPreviewScreen(),
            )
    );

Result expected :

enter image description here Any idea?

Upvotes: 147

Views: 220664

Answers (30)

TSR
TSR

Reputation: 20617

To get full control of Width, make it bigger or smaller, Wrap in SizedBox and Use width: double.maxFinite (Careful, it is NOT double.infinity)

  Widget _contactUsDialog() {
    return AlertDialog(
      insetPadding: EdgeInsets.all(32), // <- outter padding
      contentPadding: EdgeInsets.all(8), // <- inner padding
      title: Text('Contact Us', textAlign: TextAlign.center),
      content: SizedBox(
        width: double.maxFinite, // <- here
        child:  ReceiptDialog(order: ProductOrderViewModel.empty(),
        ),
      ),
      // content: _contactUsContent(),
      actions: [
        TextButton(
          onPressed: () {
            Navigator.of(context).pop();
          },
          child: Text('Close'),
        ),
      ],
    );
  }

Upvotes: 2

Umar
Umar

Reputation: 418

just wrap content with column

showDialog(
                    context: context,
                    builder: (context) {
                      return AlertDialog(
                        title: const Text("Bookmark"),
                        insetPadding: const EdgeInsets.all(0),
                        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
                        content: Column(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            Container(
                              color: Colors.red,
                              width: screen.width * 0.70,
                            )
                          ],
                        ),
                      );
                    });

Upvotes: 2

44yu5h
44yu5h

Reputation: 133

Hope this helps :D

I am no expert, but I don't know why are they making it so complicated. I just wanted to increase the width a little which is what the OP and many would want.

A SizedBox does the trick.

showDialog(
    context: context,
    builder: (context) => const AlertDialog(
      actions: [
        Text("Some text"),

        SizedBox(
          height: 20,
          width: 200, // width here
        ),

        Text("Some more text"),
      ]),
)

Thanks!
Upvote if it helps :)

Upvotes: 0

Alamgir Khan
Alamgir Khan

Reputation: 135

AlertDialog(
   insetPadding: EdgeInsets.all(12), // Outside Padding
   contentPadding: EdgeInsets.all(12), // Content Padding
   ....

You can try 0/any-number instead of 12.

Upvotes: 4

Abdulrahman Masoud
Abdulrahman Masoud

Reputation: 1126

you can easily Wrap you content inside your AlertDialog with Sizedbox widget contain the size you need

 return AlertDialog(
            content: SizedBox(
              width: MediaQuery.of(context).size.width,
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                mainAxisSize: MainAxisSize.min,
                children: <Widget>[

...etc

Upvotes: 3

Ahmed Raafat
Ahmed Raafat

Reputation: 307

To be flexible in the width and height of dialog from content use this if you want a height of dialog also set from you, you can add height in container MediaQuery.of(context).size.height then add vertical padding in insetPadding

showDialog(
  context: context,
  builder: (BuildContext context) {
    return SimpleDialog(
      insetPadding: EdgeInsets.symmetric(horizontal: 20),
      contentPadding: EdgeInsets.all(20),
      children:[
        Container(
            width: MediaQuery.of(context).size.width,
            child: widget
        )
      ]
    );
  },
);

Upvotes: 0

Abhishek Gupta
Abhishek Gupta

Reputation: 1

in the alert box ..just add inset padding as

alertbox(

.. insetpadding: EdgeInsets.symmetric(horizontal:10),

..

),

It will change the width

Upvotes: -1

Nanang Fitrianto
Nanang Fitrianto

Reputation: 688

you can use this package: https://pub.dev/packages/flutter_smart_dialog

the package can make custom size dialog more easily and more feature in it.

for example:

SmartDialog.show(builder: (context) {
  return Container(
    height: 80,
    width: 180,
    decoration: BoxDecoration(
      color: Colors.black,
      borderRadius: BorderRadius.circular(10),
    ),
    alignment: Alignment.center,
    child:
    Text('easy custom dialog', style: TextStyle(color: Colors.white)),
  );
});

Upvotes: 0

ashish raturi
ashish raturi

Reputation: 1

/// this works for me paste your body and see result

Future _showDialog() async { return showDialog( context: context,

barrierDismissible: true,
builder: (BuildContext context) {
  return Center(
    child: Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        Material(
          color: Colors.transparent,
          child: Container(
            padding: EdgeInsets.fromLTRB(5, 10, 5, 10),
            decoration: BoxDecoration(
              color: Colors.white,
              borderRadius: BorderRadius.circular(5),
            ),
            alignment: Alignment.center,
            width: MediaQuery.of(context).size.width,
            margin: EdgeInsets.all(10),
            /// paste your item body 
            child:body,
          ),
        ),
      ],
    ),
  );
},

); }

Upvotes: 0

Quick learner
Quick learner

Reputation: 11477

Use width: MediaQuery.of(context).size.width to increase width of the alert

Example:

return AlertDialog(
      title: Text("Select Birth Date"),
      content: Container(
        width: MediaQuery.of(context).size.width,
        height: 300,
        child: CupertinoDatePicker(
          mode: CupertinoDatePickerMode.date,
          initialDateTime: DateTime(1969, 1, 1),
          onDateTimeChanged: (DateTime newDateTime) {
            // Do something
           
          },
        ),
      ),
      actions: <Widget>[
        FlatButton(
          child: Text("Select"),
          onPressed: () {
            widget.onSelected(selectedDate);
            Navigator.pop(context);
            //.....
          },
        ),
      ],
    );

Upvotes: -1

Nao Kreuzeder
Nao Kreuzeder

Reputation: 178

The solution that worked for me.

Set the insetPadding of the AlertDialog.

Plus, wrap the content in a SizedBox and set the width to MediaQuery.of(context).size.width.

return AlertDialog(
  content: SizedBox(
    width: MediaQuery.of(context).size.width,
    child: const Text("Content"),
  ),
  insetPadding: const EdgeInsets.all(10),
);

Setting just the insetPadding alone does not work.

Upvotes: 12

mostapha
mostapha

Reputation: 221

I am using get package and it is wonderful. use its dialog, easily sizable

Get.generalDialog(pageBuilder: (BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation,) {
      return SimpleDialog(
        shape: RoundedRectangleBorder( borderRadius: BorderRadius.circular(Constants.padding), ),
        elevation: 0, backgroundColor: Colors.transparent,
        children: [Center(child: Stack(
          children: <Widget>[
            Container(width: Get.width * 0.95,
              padding: const EdgeInsets.only(left: Constants.padding,top: Constants.avatarRadius
                  + Constants.padding, right: Constants.padding,bottom: Constants.padding
              ),
              margin: const EdgeInsets.only(top: Constants.avatarRadius),
              decoration: BoxDecoration(
                shape: BoxShape.rectangle,
                color: Get.theme.scaffoldBackgroundColor,
                borderRadius: BorderRadius.circular(Constants.padding),
                boxShadow: const [
                  BoxShadow(color: Colors.black,offset: Offset(0,10), blurRadius: 10 ),
                ]
              ),
              child: Text('body'),
            ),
            Positioned(
              left: Constants.padding, right: Constants.padding,
              child: CircleAvatar(
                backgroundColor: Colors.blueAccent, radius: Constants.avatarRadius,
                child: ClipRRect(
                  borderRadius: const BorderRadius.all(Radius.circular(Constants.avatarRadius)),
                  child: Icon(Icons.done, size: 24, color: Colors.white,)
                ),
              ),
            ),
            Positioned(
              left: 0,
              //right: Constants.padding,
              child: CircleAvatar(
                backgroundColor: Colors.blueAccent, radius: Constants.avatarRadius,
                child: ClipRRect(
                  borderRadius: const BorderRadius.all(Radius.circular(Constants.avatarRadius)),
                  child: InkWell(child: const Icon(Icons.close, size: 24, color: Colors.white,), onTap: (){Get.back();},)
                ),
              ),
            ),
          ],
        ))],
      );
    }, barrierDismissible: true, barrierLabel: '');

Upvotes: -1

CopsOnRoad
CopsOnRoad

Reputation: 268444

Using built-in dialog:

  • To increase the width:

    AlertDialog(
  title: Text("AlertDialog"),
  insetPadding: EdgeInsets.zero,
)

  • To decrease the width:

    AlertDialog(
  title: Text("AlertDialog"),
  insetPadding: EdgeInsets.symmetric(horizontal: 100),
)

Using custom dialog:

enter image description here

Call this method:

showGeneralDialog(
  context: context,
  barrierColor: Colors.black.withOpacity(0.5),
  pageBuilder: (_, __, ___) {
    return Material(
      color: Colors.transparent,
      child: Center(
        child: Container(
          color: Colors.white, // Dialog background
          width: 120, // Dialog width
          height: 50, // Dialog height
          child: SingleChildScrollView(
            child: Column(
              children: [
                Text('I am a small Dialog'),
              ],
            ),
          ),
        ),
      ),
    );
  },
);

Upvotes: 79

lava
lava

Reputation: 7451

Add InsetPadding property like this

     insetPadding: EdgeInsets.zero




  AlertDialog(
      title: Center(child: Text("$title")),
------------------------->Here we added the property
      insetPadding: EdgeInsets.zero,
      titlePadding: EdgeInsets.only(top: 14.0, bottom: 4),
      content: Container(
        height: 50,
        child: TextFormField(
          controller: find_controller,
          decoration: InputDecoration(
            suffixIcon: context.watch<MediaProvider>().isChangeDialog
                ? IconButton(
                    onPressed: () {
                      clearController(find_controller);
                    },
                    icon: Icon(Icons.clear))
                : null,
            border: OutlineInputBorder(
                borderSide: BorderSide(color: Colors.deepPurpleAccent)),
            hintText: 'Id',
          ),
          onChanged: (val) {
            if (val.isNotEmpty)
              context.read<MediaProvider>().isChangeDialog = true;
            else
              context.read<MediaProvider>().isChangeDialog = false;
          },
        ),
      ),
      actions: [
        Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: const EdgeInsets.all(4.0),
              child: OutlinedButton(
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Align(
                        child: Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 12.0),
                          child: Icon(Icons.clear),
                        ),
                      ),
                      Text("Cancel")
                    ],
                  ),
                  onPressed: () {
                    context.read<MediaProvider>().isChangeDialog = false;
                    Navigator.of(context).pop();
                  }),
            ),
            Padding(
              padding: const EdgeInsets.all(4.0),
              child: ElevatedButton(
                  onPressed: context.watch<MediaProvider>().isChangeDialog
                      ? () {
                          context.read<MediaProvider>().isChangeDialog = false;
                          okCallback;
                        }
                      : null,
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Align(
                        child: Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 12.0),
                          child: Icon(Icons.check),
                        ),
                      ),
                      Text("OK")
                    ],
                  )),
            )
          ],
        ),
      ],
    );

Before
Before

After
[2]: https://i.sstatic.net/pzYK6.png

Upvotes: 2

Petro
Petro

Reputation: 3662

I found the simplest way... just add insetPadding: EdgeInsets.zero, and it will expand to max size width:

 showDialog(
          context: context,
          builder: (BuildContext context) {
            return AlertDialog(
              title: Center(child: Text("Send Message", style: TextStyle(
                  color: Colors.white, fontWeight: FontWeight.bold),)),
              backgroundColor: Colors.indigo[700],
              insetPadding: EdgeInsets.zero,
              content:

Upvotes: 1

Yash Dhanlobhe
Yash Dhanlobhe

Reputation: 25

In my case, I was using listview inside the dialog box so I was not using shrink wrap inside ListView hopes this will help someone.

ListView.builder(
shrinkWrap : true...
...
};

Upvotes: -1

Felipe Carvalho
Felipe Carvalho

Reputation: 13206

I finally found a way to change the width of an AlertDialog. Just wrap the "content" with a Container, and set the width to it.

return AlertDialog(
...
content: Container(
   width: MediaQuery.of(context).size.width*0.45,
   child: ...

AlertDialog with width modified

Upvotes: 8

Smith July
Smith July

Reputation: 87

:

 return Dialog(

  backgroundColor: Colors.white,
  insetPadding: EdgeInsets.all(10.0),
  child: Container(
   
    width: double.infinity,

use insetpadding where you are returning Dialog and give it a double value, For my case, i gave it a 10.0 insetPadding: EdgeInsets.all(10.0), you can give it a custom height

Upvotes: 3

Dani And&#250;jar
Dani And&#250;jar

Reputation: 1176

return Dialog(
      insetPadding: EdgeInsets.symmetric(
        horizontal: X,
      ),
);

Upvotes: 1

Kent
Kent

Reputation: 2557

This is much more simple then the other answers make it out to be. Just use a builder to change the size of the dialog as it is being built(constructed, instantiated in other languages). This means you can also query the screen size and make a decision on how much space you want depending on said screen size. For example more space on a tablet then on a phone. You can make Scaffold a child of the Container if you need the App bar and other functions.

showDialog(
  context: context,
  builder: (_) => new AlertDialog(
  shape: RoundedRectangleBorder(
    borderRadius:
      BorderRadius.all(
        Radius.circular(10.0))),
    content: Builder(
      builder: (context) {
        // Get available height and width of the build area of this widget. Make a choice depending on the size.                              
        var height = MediaQuery.of(context).size.height;
        var width = MediaQuery.of(context).size.width;

        return Container(
          height: height - 400,
          width: width - 400,
        );
      },
    ),
  )
);

Examples of different sizes:

enter image description here

enter image description here

enter image description here

Optionally add these to remove unneeded inner/outer border space.

          insetPadding: EdgeInsets.zero,
          contentPadding: EdgeInsets.zero,
          clipBehavior: Clip.antiAliasWithSaveLayer,

Upvotes: 111

Grigoris Kritopoulos
Grigoris Kritopoulos

Reputation: 424

Hello you can actually use insetPadding and use a column inside content that will contain a SizedBox(width:MediaQuery.of(context).size.width).The only difference is that I used AlertDialog. Bellow is the way it worked for me. You can set dialog width by changing padding inside insetPadding. Hope i helped :).

dialog(){
TextEditingController controller = TextEditingController();

return showDialog(
  context: context,
  barrierDismissible: true,
  builder: (_) => AlertDialog(
    insetPadding:  EdgeInsets.symmetric(
        horizontal: MediaQuery.of(context).size.width * 0.08),
    content: SingleChildScrollView(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            height: 16,
            width: MediaQuery.of(context).size.width,
          ),
          Text(
            'Hello',
          ),
          SizedBox(
            height: 15,
          ),
          Text(
            'Description',
          ),
          TextField(
            controller: controller,
            style: TextStyle(
              color: Colors.black,
            ),
          ),
        ],
      ),
    ),
    actions: [
      FlatButton(
        child: Text("Close"),
        onPressed: () {
          Navigator.of(context).pop();
        },
      ),
    ],
  ),
);

}

This is how it looks like https://i.sstatic.net/bvKpP.png

Upvotes: 3

Yohan de Rose
Yohan de Rose

Reputation: 154

Medling with insetWidth and future builder etc. didn't work for me - just editing the content prop's width worked perfectly.

showDialog(
    context: context,
    builder: (context) {
      Future.delayed(Duration(seconds: 1000), () {
        Navigator.of(context).pop(true);
      });
      return AlertDialog(
        insetPadding: EdgeInsets.all(8.0),
        title: Text(
          "Time to go pro!",
          textAlign: TextAlign.center,
        ),
        content: Container(
          width: MediaQuery.of(context).size.width,
          child: BuySheet(
              applePayEnabled: applePayEnabled,
              googlePayEnabled: googlePayEnabled,
              applePayMerchantId: applePayMerchantId,
              squareLocationId: squareLocationId),
        ),
      );
    });

Result of the above code

Upvotes: 10

Akshatha P Halady
Akshatha P Halady

Reputation: 86

Refer this code. you can change width and height of dialogue box by setting insetPadding, because it taking default padding so we need to change like this.

showDialog(
  context: context,
  builder: (_) =>
   Dialog(
     insetPadding: EdgeInsets.symmetric(horizontal: 2.0, vertical: 2.0),
     backgroundColor: Colors.transparent,
    child: Container(
      width: double.infinity,
      height: MediaQuery.of(context).size.height*0.7 ,
      decoration: BoxDecoration(
        color: Colors.grey[900],
      ),
      child: Column(
        children: [
          Padding(
            padding: const EdgeInsets.all(10.0),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.end,
              children: [
                GestureDetector(
                  onTap: (){
                    Navigator.pop(context);
                  },
                    child: Icon(Icons.close,color: Colors.grey,)),
              ],
            ),
          ),
          Text("select your avatar",style: TextStyle(color: white,fontWeight: FontWeight.bold),),
        ],
      ),
    ),
  ),
);

Upvotes: 4

Ranjit Joshi
Ranjit Joshi

Reputation: 91

use Dialog()

Dialog(
  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(15)),
  insetPadding: EdgeInsets.all(15),
  child: SingleChildScrollView(
    child: Container(),
    ),
  ),
);

Upvotes: 8

BRIJESH SAKARIYA
BRIJESH SAKARIYA

Reputation: 290

You can change the AlertDialog property insetPadding it will be a simple way for you.

 void alertBox() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        insetPadding: EdgeInsets.symmetric(horizontal: 10, vertical: 10),
        // (horizontal:10 = left:10, right:10)(vertical:10 = top:10, bottom:10)
        contentPadding: EdgeInsets.zero,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
        content: Container(
          width: MediaQuery.of(context).size.width - 20,
          // width = device width minus insetPadding = deviceWidth - 20  (left:10, right:10 = 20)
          height: MediaQuery.of(context).size.height - 20,
          // height = device height minus insetPadding = deviceHeight - 20  (top:10, bottom:10 = 20)
          child: ClipRRect(
            borderRadius: BorderRadius.circular(10),
            child: Card(
              margin: EdgeInsets.zero,
              color: Colors.amber,
            ),
          ),
        ),
      ),
    );
  }

Upvotes: 6

user1094821
user1094821

Reputation: 1845

As of May 2020, if you want to change the inset padding of a dialog, all you have to do is use the Dialog class and override the 'insetPadding' property. You can make a dialog extend all the way to the screen edges if you want to.

You can also make some cool custom dialogs by making the dialog surface itself transparent and then add whatever widgets you want. For example:

showDialog(Dialog(
  backgroundColor: Colors.transparent,
  insetPadding: EdgeInsets.all(10),
  child: Stack(
    overflow: Overflow.visible,
    alignment: Alignment.center,
    children: <Widget>[
      Container(
        width: double.infinity,
        height: 200,
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(15),
          color: Colors.lightBlue
        ),
        padding: EdgeInsets.fromLTRB(20, 50, 20, 20),
        child: Text("You can make cool stuff!",
          style: TextStyle(fontSize: 24),
          textAlign: TextAlign.center
        ),
      ),
      Positioned(
        top: -100,
        child: Image.network("https://i.imgur.com/2yaf2wb.png", width: 150, height: 150)
      )
    ],
  )
));

Results in:

Dialog example

Upvotes: 167

Cirec Beback
Cirec Beback

Reputation: 693

My solution is to enclose the Dialog in a widget that defeats the extra padding added by the Dialog class by modifying the MediaQueryData.

import 'package:myapp/widgets/dialog_inset_defeat.dart';
...

showDialog(
    context: context,
    builder: (_) => DialogInsetDefeat(
      context: context,
      child: SimpleDialog(...),
    )
);

... or use showDialogWithInsets() for custom values:

showDialogWithInsets(
    context: context,
    edgeInsets: EdgeInsets.symmetric(horizontal: 8),
    builder: (_) => SimpleDialog(...),
    )
);

File dialog_inset_defeat.dart

   import 'package:flutter/material.dart';

/// A widget to defeat the hard coded insets of the [Dialog] class which
/// are [EdgeInsets.symmetric(horizontal: 40.0, vertical: 24.0)].
///
/// See also:
///
///  * [Dialog], for dialogs that have a message and some buttons.
///  * [showDialog], which actually displays the dialog and returns its result.
///  * <https://material.io/design/components/dialogs.html>
///  * <https://stackoverflow.com/questions/53913192/flutter-change-the-width-of-an-alertdialog>
class DialogInsetDefeat extends StatelessWidget {
  final BuildContext context;
  final Widget child;
  final deInset = EdgeInsets.symmetric(horizontal: -40, vertical: -24);
  final EdgeInsets edgeInsets;

  DialogInsetDefeat({@required this.context, @required this.child, this.edgeInsets});

  @override
  Widget build(BuildContext context) {
    var netEdgeInsets = deInset + (edgeInsets ?? EdgeInsets.zero);
    return MediaQuery(
      data: MediaQuery.of(context).copyWith(viewInsets: netEdgeInsets),
      child: child,
    );
  }
}

/// Displays a Material dialog using the above DialogInsetDefeat class.
/// Meant to be a drop-in replacement for showDialog().
///
/// See also:
///
///  * [Dialog], on which [SimpleDialog] and [AlertDialog] are based.
///  * [showDialog], which allows for customization of the dialog popup.
///  * <https://material.io/design/components/dialogs.html>
Future<T> showDialogWithInsets<T>({
  @required BuildContext context,
  bool barrierDismissible = true,
  @required WidgetBuilder builder,
  EdgeInsets edgeInsets,
}) {
  return showDialog(
    context: context,
    builder: (_) => DialogInsetDefeat(
      context: context,
      edgeInsets: edgeInsets,
      child: Builder(builder: builder),
    ),
    // Edited! barrierDismissible: barrierDismissible = true,
    barrierDismissible: barrierDismissible,
  );
}

Works for me as of Flutter 1.8.3. YMMV

Upvotes: 7

Mikhail Chibel
Mikhail Chibel

Reputation: 1955

As a workaround, you can play with the dialog title, in most cases the dialog will expand horizontally to accommodate the title. So you can create big title to make sure the dialog will take max width. Obviously you can't just put long title, but you can build your title of two text widgets, where one of them has text color matching background. For the case where no title should be shown: 

showDialog(
   context: context,
   builder: (_) =>
        new AlertDialog(
           title: Text('hidden title, just set font text to the same as background.',
                 style: TextStyle(color: Colors.white)),
           shape: RoundedRectangleBorder(
               borderRadius: BorderRadius.all(Radius.circular(10.0))
           ),
           content: ProductPreviewScreen(),
        )
);

Upvotes: 0

BIS Tech
BIS Tech

Reputation: 19514

Use Padding widget

 Padding(
   padding: EdgeInsets.only(left: 50.0, right: 50.0),
   child://AlertDialog or any other Dialog you can use
         Dialog(
                elevation: 0.0,
                backgroundColor: Colors.transparent,
                child: Container(
                  width: 10.0,
                  height: 50.0,
                  color: Colors.red,
                )
            ))

Upvotes: 10

Jerome Escalante
Jerome Escalante

Reputation: 4397

You could try to wrap your AlertDialog widget with ConstrainedBox widget as suggested in here and set your desired value for maxWidth parameter.

UPDATED

I just looked at the code of the parent of the AlertDialog widget which is the Dialog widget and found out that it wrapped its child with a ConstrainedBox widget with a minWidth of 280 pixels. This is the reason why we can't change the width of the AlertDialog widget.

Fortunately, there are two things that we can do. First option would be to alter the default minWidth of the Dialog Widget inside the dialog.dart file. Note that changing this would affect all of your flutter projects that uses the Dialog widget. 

//inside dialog.dart

class Dialog extends StatelessWidget {

...

@override
Widget build(BuildContext context) {
  final DialogTheme dialogTheme = DialogTheme.of(context);
  return AnimatedPadding(
    padding: MediaQuery.of(context).viewInsets + const EdgeInsets.symmetric(horizontal: 40.0, vertical: 24.0),
    duration: insetAnimationDuration,
    curve: insetAnimationCurve,
    child: MediaQuery.removeViewInsets(
      removeLeft: true,
      removeTop: true,
      removeRight: true,
      removeBottom: true,
      context: context,
      child: Center(
        child: ConstrainedBox(
          constraints: const BoxConstraints(minWidth: 280.0), // You can set your desired value for minWidth here
          child: Material(
            elevation: 24.0,

            ...

You can then use the AlertDialog like this:

showDialog(
  context: context,
  builder: (_) => AlertDialog(
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.all(Radius.circular(10.0))
      ),
    contentPadding: EdgeInsets.all(0.0),
    content: ProductPreviewScreen(),
    )
  )
);

The other way would be to create our own customize dialog.

showDialog(
  context: context,
  builder: (_) => Center( // Aligns the container to center
    child: Container( // A simplified version of dialog. 
      width: 100.0,
      height: 56.0,
      color: Colors.pink,
      )
    )
 );

Upvotes: 26

Related Questions