flutter_elinux/lib/features/matrix_rgb/presentation/matrix_screen.dart

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

import '../data/models/pixel.dart';
import 'widgets/pixel_painter.dart';

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

  @override
  State<MatrixScreen> createState() => _MatrixScreenState();
}

class _MatrixScreenState extends State<MatrixScreen> {
  List<Pixel> pixels = List.generate(
    64,
    (index) => Pixel(
      offset: Offset.zero,
      color: Colors.transparent,
    ),
  );
  Color color = Colors.green;

  void _updatePixel(Offset offset) {
    const double cellSize = 50; // Size of each grid cell

    // Get the row and column based on touch position
    int row = (offset.dy / cellSize).floor();
    int col = (offset.dx / cellSize).floor();

    // Bound Check (Only proceed if within the grid)
    if (row >= 0 && row < 8 && col >= 0 && col < 8) {
      // Calculate the index in the flat list
      int index = row * 8 + col;

      // Update the Pixel
      pixels[index] = Pixel(offset: offset, color: color);
      setState(() {});
    }
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Listener(
            onPointerDown: (event) {
              // Determine offset
              Offset offset =
                  Offset(event.localPosition.dx, event.localPosition.dy);

              // Calculate index and update pixel
              _updatePixel(offset);
            },
            onPointerMove: (event) {
              // Determine offset
              Offset offset =
                  Offset(event.localPosition.dx, event.localPosition.dy);

              // Calculate index and update pixel
              _updatePixel(offset);
            },
            child: InteractiveViewer(
              maxScale: 5,
              child: Container(
                // color: Colors.white,
                decoration: BoxDecoration(border: Border.all()),
                child: ClipRRect(
                  child: GridPaper(
                    divisions: 2,
                    interval: 500,
                    color: Theme.of(context).textTheme.headlineLarge?.color ??
                        Colors.red,
                    child: Transform(
                      transform: Matrix4.identity()..scale(50.0),
                      child: ClipRect(
                        child: CustomPaint(
                          size: const Size(400, 400),
                          painter: PixelPainter(
                            pixels: pixels,
                          ),
                        ),
                      ),
                    ),
                  ),
                ),
              ),
            ),
          ),
          const SizedBox(
            width: 24,
          ),
          ColorIndicator(
              width: 40,
              height: 40,
              borderRadius: 24,
              color: color,
              elevation: 1,
              onSelectFocus: false,
              onSelect: () async {
                // Wait for the dialog to return color selection result.
                final Color newColor = await showColorPickerDialog(
                  context,
                  color,
                  title: Text('ColorPicker',
                      style: Theme.of(context).textTheme.titleLarge),
                  width: 40,
                  height: 40,
                  spacing: 0,
                  runSpacing: 0,
                  borderRadius: 0,
                  wheelDiameter: 165,
                  enableOpacity: true,
                  showColorCode: true,
                  colorCodeHasColor: true,
                  pickersEnabled: <ColorPickerType, bool>{
                    ColorPickerType.wheel: true,
                  },
                  copyPasteBehavior: const ColorPickerCopyPasteBehavior(
                    copyButton: true,
                    pasteButton: true,
                    longPressMenu: true,
                  ),
                  actionButtons: const ColorPickerActionButtons(
                    okButton: true,
                    closeButton: true,
                    dialogActionButtons: false,
                  ),
                  constraints: const BoxConstraints(
                      minHeight: 480, minWidth: 320, maxWidth: 320),
                );
                // Update the state with the newly selected color from the color picker
                setState(() {
                  color = newColor;
                });
              }),
        ],
      ),
    );
  }
}