Flutter IconButton splash

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(App());
}

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
    theme: ThemeData.dark(),
    home: TestWidget()
  );
}

class TestWidget extends StatefulWidget {
  @override
  _TestWidgetState createState() => _TestWidgetState();
}

class _TestWidgetState extends State<TestWidget> {
  bool enablePress = true;
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: IconButton(
        icon: Icon(Icons.search),
        onPressed: enablePress ? () { setState(() { enablePress = false; }); } : null
      )
    );
  }
}