OpenMediacenterMobileFlutter/lib/preview_grid.dart

import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
import 'package:openmediacentermobile/platform.dart';
import 'package:openmediacentermobile/preview_tile.dart';

class PreviewGrid extends StatefulWidget {
  const PreviewGrid(
      {Key? key,
      required this.videoLoader,
      this.headerBuilder,
      this.footerBuilder})
      : super(key: key);

  final Future<List<VideoT>> Function() videoLoader;
  final Widget Function(_PreviewGridState state)? footerBuilder;
  final Widget Function(_PreviewGridState state)? headerBuilder;

  @override
  State<PreviewGrid> createState() => _PreviewGridState();
}

class _PreviewGridState extends State<PreviewGrid> {
  late Future<List<VideoT>> _data;
  Image? _previewImage;

  @override
  void initState() {
    super.initState();
    loadData();
  }

  void loadData() {
    setState(() {
      _data = widget.videoLoader();
    });
  }

  @override
  Widget build(BuildContext context) {
    final double width = MediaQuery.of(context).size.width;

    return FutureBuilder<List<VideoT>>(
      future: _data,
      builder: (BuildContext context, AsyncSnapshot<List<VideoT>> snapshot) {
        if (snapshot.hasError) {
          return Text("Error");
        } else if (snapshot.hasData) {
          return _mainGrid(snapshot.data!, width);
        } else {
          return _pageLoading();
        }
      },
    );
  }

  Widget _pageLoading() {
    return Column(children: const <Widget>[
      SizedBox(
        width: 60,
        height: 60,
        child: CircularProgressIndicator(),
      ),
      Padding(
        padding: EdgeInsets.only(top: 16),
        child: Text('Awaiting result...'),
      )
    ]);
  }

  Widget _mainGrid(List<VideoT> data, double width) {
    return Stack(
      children: [
        Column(
          children: [
            if (widget.headerBuilder != null) widget.headerBuilder!(this),
            Expanded(
              child: MasonryGridView.count(
                // every tile should be at max 330 pixels long...
                crossAxisCount: isTV() ? width ~/ 200 : width ~/ 275,
                // crossAxisCount: isTV() ? width ~/ 200 : width ~/ 330,
                itemCount: data.length,
                mainAxisSpacing: 4,
                crossAxisSpacing: 4,
                padding: EdgeInsets.all(5),
                itemBuilder: (context, index) {
                  return PreviewTile(
                    dta: data[index],
                    onLongPress: (img) {
                      setState(() {
                        _previewImage = img;
                      });
                    },
                    onLongPressEnd: () {
                      setState(() {
                        _previewImage = null;
                      });
                    },
                  );
                },
              ),
            ),
            if (widget.footerBuilder != null) widget.footerBuilder!(this),
          ],
        ),
        if (_previewImage != null) ..._buildPreviewImage(),
      ],
    );
  }

  List<Widget> _buildPreviewImage() {
    return [
      BackdropFilter(
        filter: ImageFilter.blur(
          sigmaX: 5.0,
          sigmaY: 5.0,
        ),
        child: Container(
          color: Colors.white.withOpacity(0.6),
        ),
      ),
      Container(
        child: Center(
          child: Padding(
            padding: EdgeInsets.symmetric(horizontal: 50),
            child: ClipRRect(
                borderRadius: BorderRadius.circular(10.0),
                child: _previewImage!),
          ),
        ),
      ),
    ];
  }
}