fingers_gesture_detector 0.0.1

A gesture detector that provides transformation matrices for multi-finger gestures including translation, scaling and rotation.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:fingers_gesture_detector/fingers_gesture_detector.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Fingers Gesture Detector Demo',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: const GestureDemoPage(),
    );
  }
}

class GestureDemoPage extends StatefulWidget {
  const GestureDemoPage({super.key});

  @override
  State<GestureDemoPage> createState() => _GestureDemoPageState();
}

class _GestureDemoPageState extends State<GestureDemoPage> {
  Matrix4 matrix = Matrix4.identity();
  double scale = 1.0;
  double rotation = 0.0;
  Offset translation = Offset.zero;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Fingers Gesture Demo')),
      body: Center(
        child: FingersGestureDetector(
          onMatrixUpdate: (Matrix4 m, _, __, ___) {
            setState(() {
              matrix = m;
              // You could also decompose the matrix here if needed
            });
          },
          minScale: 0.5,
          maxScale: 5.0,
          child: Transform(
            transform: matrix,
            child: Container(
              width: 200,
              height: 200,
              color: Colors.blue,
              child: const Center(
                child: Text(
                  'Pinch, rotate or drag me!',
                  style: TextStyle(color: Colors.white),
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}