OpenMediacenterMobileFlutter/lib/preview/preview_grid.dart

import 'dart:ui';

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

import '../platform.dart';
import '../screen_loading.dart';
import '../types/video.dart';
import '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 RefreshIndicator(
        onRefresh: () async {
          loadData();
          await Future.delayed(Duration(milliseconds: 600));
        },
        triggerMode: RefreshIndicatorTriggerMode.anywhere,
        color: Colors.purple,
        child: 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 ScreenLoading();
            }
          },
        ));
  }

  Widget _mainGrid(List<VideoT> data, double width) {
    return Stack(
      children: [
        Column(
          children: [
            if (widget.headerBuilder != null) widget.headerBuilder!(this),
            data.length > 0
                ? 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;
                            });
                          },
                        );
                      },
                    ),
                  )
                : Center(
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        SizedBox(
                          height: 32,
                        ),
                        Icon(Icons.warning_amber, size: 52),
                        Text("no item available")
                      ],
                    ),
                  ),
            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!),
          ),
        ),
      ),
    ];
  }
}