import 'dart:math';

import 'package:flutter/material.dart';

class GestureWidget extends StatefulWidget {
  @override
  _GestureWidgetState createState() => _GestureWidgetState();
}

class _GestureWidgetState extends State<GestureWidget> {
  double _scale = 1.0;
  Offset _offset = Offset.zero;
  double _rotation = 0.0;
  Offset _initialFocalPoint = Offset.zero;
  Offset _previousOffset = Offset.zero;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onScaleStart: (details) {
        _initialFocalPoint = details.localFocalPoint;
        _previousOffset = _offset;
      },
      onScaleUpdate: (details) {
        setState(() {
          if (details.pointerCount == 1) {
            // Tek parmakla rotate işlemi manuel olarak hesaplanıyor
            Offset delta = details.localFocalPoint - _initialFocalPoint;
            _rotation = delta.direction;
            // Burada rotate event'ını işleyebilirsiniz
            print('Rotate: $_rotation');
          } else {
            // Çift parmakla pan ve zoom işlemi
            _scale = details.scale;
            _offset =
                details.localFocalPoint - _initialFocalPoint + _previousOffset;
            // Burada pan ve zoom event'larını işleyebilirsiniz
            print('Scale: $_scale, Offset: $_offset');
          }
        });
      },
      onScaleEnd: (details) {
        _previousOffset = _offset;
      },
      child: Container(
        width: 200,
        height: 200,
        color: Colors.blue,
        child: Center(
          child: Text('Transform Me!'),
        ),
      ),
    );
  }
}