How to create a transparent full screen dialog on top of activity - Flutter

问题

I am trying to create a transparent full screen dialog on top of activity. I have tried following this thread but solution doesn't work.

In short , what I need is:

full screen dialog.
transparent background except for the widget I use for the dialog

here's my code:

To open dialog

void onNextBtnClick(){
    var route = new MaterialPageRoute(
        builder: (BuildContext context) =>
        new GenreDialogUI(),fullscreenDialog: true
    );
    Navigator.of(context).push(route);
}

For Dialog view

import 'package:flutter/widgets.dart';

class HolePuncherPainter extends CustomPainter {
  static final clearPaint = new Paint()
    ..color = Colors.transparent,
    ..blendMode = BlendMode.clear;

  const HolePuncherPainter();

  @override
  void paint(Canvas canvas, Size size) {
    canvas.drawRect(
        new Rect.fromLTWH(0.0, 0.0, size.width, size.height), clearPaint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return true;
  }
}

class GenreDialogUI extends StatefulWidget {
   @override
   _GenreDialogUI createState() => new _GenreDialogUI();
}

class _GenreDialogUI extends State<GenreDialogUI>  {

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: addAppbar(),
      body: new CustomPaint(
        painter: HolePuncherPainter(),
        child: new Container(
        color: Colors.transparent,
        alignment: Alignment.center,
        child: UtilCommonWidget.addText('Transparent Dialog', Colors.red, 22.0, 1),
        ),
      ),
    );
  }
}

回答1:

Navigator.of(context).push(PageRouteBuilder(
    opaque: false,
    pageBuilder: (BuildContext context, _, __) {
        return YourFullScreenAlertDialog()
    }
));

YourFullScreenAlertDialog could be a widget that has a background color, Colors.transparent, like @creativecreatorormaybenot mentioned earlier.

回答2:

For me the following worked:

showDialog(
  context: context,
  builder: (_) => Material(
    type: MaterialType.transparency,
    child: Center(
      // Aligns the container to center
      child: Container(
        // A simplified version of dialog.
        width: 100.0,
        height: 56.0,
        color: Colors.green,
        child: Text('jojo'),
      ),
    ),
  ),
);

来源：https://stackoverflow.com/questions/51258666/how-to-create-a-transparent-full-screen-dialog-on-top-of-activity-flutter

标签

dart

Flutter

flutter-layout