Lazy load

[gopawe]

Lazy load

[gopawe]

Thank you !

[jtkeyva]

@gopawe i asked asked a while back but no activity. i'm gonna have a crack at it but not sure the outcome because it's not a typical list/grid

[gopawe]

@jtkeyva , please let me know if you find a solution. I will highly appreciate

[jtkeyva]

@gopawe
this is a start but InteractiveViewer absorbs all GestureDetector so haven't figtured out how to make each circle tappable. Also, haven't figured out how to scale them. But it is essentially an infinite list of images in all directions. There's a bug where every other column disappears too early along the edge too...

Let me know if you make any progress on this, thanks.

import 'package:flutter/material.dart';
import 'package:vector_math/vector_math_64.dart' show Quad, Vector3;

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

class IVBuilderExampleApp extends StatelessWidget {
  const IVBuilderExampleApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('IV Builder Example'),
        ),
        body: _IVBuilderExample(),
      ),
    );
  }
}

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

  @override
  State<_IVBuilderExample> createState() => _IVBuilderExampleState();
}

class _IVBuilderExampleState extends State<_IVBuilderExample> {
  static const double _cellSize = 80.0;

  @override
  Widget build(BuildContext context) {
    return Center(
      child: LayoutBuilder(
        builder: (BuildContext context, BoxConstraints constraints) {
          return InteractiveViewer.builder(
            minScale: .5,
            maxScale: 10,
            boundaryMargin: const EdgeInsets.all(double.infinity),
            builder: (BuildContext context, Quad viewport) {
              return _TableBuilder(
                cellSize: _cellSize,
                viewport: axisAlignedBoundingBox(viewport),
                builder: (BuildContext context, int row, int column) {
                  final bool isStaggeredRow = row % 2 != 0;
                  final double offsetX = isStaggeredRow ? _cellSize / 2 : 0;
                  final double offsetY = 0;

                  return Positioned(
                    left: column * _cellSize + offsetX,
                    top: row * _cellSize + offsetY,
                    child: GestureDetector(
                      onTap: () {
                        print('Tapped: $row x $column');
                      },
                      child: Container(
                        height: _cellSize,
                        width: _cellSize,
                        decoration: BoxDecoration(
                          image: DecorationImage(image: NetworkImage('https://picsum.photos/300?rando={$row * 100 * $column}')),
                          color: (row + column) % 2 == 0
                              ? Colors.white
                              : Colors.grey.withOpacity(0.1),
                          shape: BoxShape.circle,
                        ),
                        child: Center(
                          child: Text('$row x $column'),
                        ),
                      ),
                    ),
                  );
                },
              );
            },
          );
        },
      ),
    );
  }

  Rect axisAlignedBoundingBox(Quad quad) {
    double xMin = quad.point0.x;
    double xMax = quad.point0.x;
    double yMin = quad.point0.y;
    double yMax = quad.point0.y;
    for (final Vector3 point in <Vector3>[
      quad.point1,
      quad.point2,
      quad.point3,
    ]) {
      if (point.x < xMin) {
        xMin = point.x;
      } else if (point.x > xMax) {
        xMax = point.x;
      }

      if (point.y < yMin) {
        yMin = point.y;
      } else if (point.y > yMax) {
        yMax = point.y;
      }
    }

    return Rect.fromLTRB(xMin, yMin, xMax, yMax);
  }
}

typedef _CellBuilder = Widget Function(BuildContext context, int row, int column);

class _TableBuilder extends StatelessWidget {
  const _TableBuilder({
    required this.cellSize,
    required this.viewport,
    required this.builder,
  });

  final double cellSize;
  final Rect viewport;
  final _CellBuilder builder;

  @override
  Widget build(BuildContext context) {
    final int firstRow = (viewport.top / cellSize).floor();
    final int lastRow = (viewport.bottom / cellSize).ceil();
    final int firstCol = (viewport.left / cellSize).floor();
    final int lastCol = (viewport.right / cellSize).ceil();

    return SizedBox(
      width: 1,
      height: 1,
      child: Stack(
        clipBehavior: Clip.none,
        children: <Widget>[
          for (int row = firstRow; row < lastRow; row++)
            for (int col = firstCol; col < lastCol; col++)
              builder(context, row, col),
        ],
      ),
    );
  }
}