Passing props that will be used in style in child component - Vue

Question

I have a button that runs the function startProcess which will generate a random number. This random number will be passed as a prop to Child.vue that will be used in style. I looked into some pages How to use props in style in vue. The solution was to use computed, but nothing seems to work. For a better understanding, please check the code.

P.S. This is a simplified code. Removed template, script, style.

App.vue

<button @click="startProcess">Start</button>
<Child v-if="toggleChild" :top="top" />

data() {
    return {
        toggleChild: false,
        top: 0
    }
},
methods: {
    startProcess() {
        this.toggleChild = !this.toggleChild;
        this.top = Math.random();
    };
}

Child.vue

<button @click="logTop">Log</button>

props: { top: Number },
computed: {
    return {
        cssProps() {
            "--top": `${this.top}%`;
        };
    };
};

.foo {
  top: var(--top);
};

Answer 1

You can use the bubble from material design by importing

import 'package:flutter/material.dart';

or simply :-

    Bubble(
  margin: BubbleEdges.only(leftBottom: 10),
  nip: BubbleNip.rightTop,
  color: Color.fromRGBO(225, 255, 199, 1.0),
  child: Text('Your Text', textAlign: TextAlign.right)

If u need more reference read this.

Answer 2

you ca use these packages to have a bubble shape for a message

bubble: ^1.2.1 flutter_chat_bubble: ^2.0.0

Answer 3

you can use customPainter or CustomClipper , in this case, better use clipper because we need all size from its child,

code :

import 'package:flutter/material.dart';

class MessageBox extends StatefulWidget {
  const MessageBox({Key? key}) : super(key: key);

  @override
  _MessageBoxState createState() => _MessageBoxState();
}

class _MessageBoxState extends State<MessageBox> {
  @override
  Widget build(BuildContext context) {
    return Material(
      child: Column(
        children: [
          const SizedBox(height: 200,),
          Container(
            width: MediaQuery.of(context).size.width,
            height: 100,
            decoration: BoxDecoration(
              color: Colors.purple,
              borderRadius: BorderRadius.circular(35.0)
            ),
          ),
          ClipPath(
            clipper: MessageClipper(),
            child: Container(
              height: 20,
              width: MediaQuery.of(context).size.width,
              color: Colors.purple,
            ),
          )
        ],
      ),
    );
  }
}

class MessageClipper extends CustomClipper<Path> {

  @override
  Path getClip(Size size) {
    
    var firstOffset = Offset(size.width * 0.1, 0.0);
    var secondPoint = Offset(size.width * 0.15, size.height );
    var lastPoint = Offset(size.width * 0.2, 0.0);
    var path = Path()
    ..moveTo(firstOffset.dx, firstOffset.dy)
    ..lineTo(secondPoint.dx, secondPoint.dy)
    ..lineTo(lastPoint.dx, lastPoint.dy)
    ..close();


    return path;
  }

  @override
  bool shouldReclip(covariant CustomClipper<Path> oldClipper) {
   
    return true;
  }

}

here result :