manager-app/lib/Screens/Resources/resources_screen.dart

import 'package:auto_size_text/auto_size_text.dart';
import 'package:flutter/material.dart';
import 'package:manager_app/Components/fetch_resource_icon.dart';
import 'package:manager_app/Screens/Resources/new_resource_popup.dart';
import 'package:manager_app/Screens/Resources/show_resource_popup.dart';
import 'package:manager_app/app_context.dart';
import 'package:manager_app/constants.dart';
import 'package:managerapi/api.dart';
import 'package:provider/provider.dart';

class ResourcesScreen extends StatefulWidget {
  final Function onGetResult; //return ResourceDTO
  final bool isImage;
  const ResourcesScreen({
    Key key,
    this.isImage,
    this.onGetResult,
  }) : super(key: key);

  @override
  _ResourcesScreenState createState() => _ResourcesScreenState();
}

class _ResourcesScreenState extends State<ResourcesScreen> {

  @override
  Widget build(BuildContext context) {
    final appContext = Provider.of<AppContext>(context);
    Size size = MediaQuery.of(context).size;

    return Container(
      child: FutureBuilder(
          future: getResources(widget.onGetResult, widget.isImage, appContext),
          builder: (context, AsyncSnapshot<dynamic> snapshot) {
            if (snapshot.connectionState == ConnectionState.done) {
              var tempOutput = new List<ResourceDTO>.from(snapshot.data);
              tempOutput.add(ResourceDTO(id: null));
              return bodyGrid(tempOutput, size, appContext);
            } else if (snapshot.connectionState == ConnectionState.none) {
              return Text("No data");
            } else {
              return Center(child: Container(height: size.height * 0.2, child: Text('LOADING TODO FRAISE')));
            }
          }
      ),
    );
  }

  Widget bodyGrid(data, Size size, AppContext appContext)  {
    return GridView.builder(
        shrinkWrap: true,
        gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 6),
        itemCount: data.length,
        itemBuilder: (BuildContext context, int index) {
          return
            InkWell(
              onTap: () {
                if (widget.onGetResult == null) {
                  // Main screen
                  if (data[index].id == null) {
                    showNewResource(appContext, context);
                  } else {
                    showResource(data[index], appContext, context, size);
                  }
                } else {
                  if (data[index].id == null) {
                    showNewResource(appContext, context);
                  } else {
                    // Result for select modal
                    widget.onGetResult(data[index]);
                  }
                }

              },
              child: Container(
                decoration: boxDecoration(data[index], appContext),
                padding: const EdgeInsets.all(15),
                margin: EdgeInsets.symmetric(vertical: 15, horizontal: 15),
                child: Align(
                    alignment: Alignment.center,
                    child: getElement(data[index], size, appContext)
                ),
              ),
            );
        }
    );
  }

  getElement(ResourceDTO resource, Size size, AppContext appContext) {
    if (resource.id != null) {
      return Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          SizedBox(
            height: size.width *0.01,
          ),
          Align(
            alignment: Alignment.center,
            child: AutoSizeText(
              resource.label == null ? "" : resource.label,
              style: new TextStyle(fontSize: 20),
              maxLines: 1,
            ),
          ),
          Align(
            alignment: Alignment.bottomRight,
            child: Icon(
              getResourceIcon(resource.type),
              color: kPrimaryColor,
              size: 25,
            ),
          ),
        ],
      );
    } else {
      return Icon(
        Icons.add,
        color: kTextLightColor,
        size: 80.0,
      );
    }
  }
}

boxDecoration(dynamic resourceDetailDTO, appContext) {
  return BoxDecoration(
    color: resourceDetailDTO.id == null ? Colors.lightGreen : kBackgroundColor,
    shape: BoxShape.rectangle,
    borderRadius: BorderRadius.circular(30.0),
    image: resourceDetailDTO.id != null && resourceDetailDTO.type != ResourceType.videoUrl ? new DecorationImage(
      fit: BoxFit.cover,
      colorFilter: new ColorFilter.mode(Colors.black.withOpacity(0.3), BlendMode.dstATop),
      image: new NetworkImage(
        resourceDetailDTO.type == ResourceType.image ? appContext.getContext().clientAPI.resourceApi.apiClient.basePath+"/api/Resource/"+ resourceDetailDTO.id : resourceDetailDTO.data,
      ),
    ) : null,
    boxShadow: [
      BoxShadow(
        color: kSecond,
        spreadRadius: 0.5,
        blurRadius: 5,
        offset: Offset(0, 1.5), // changes position of shadow
      ),
    ],
  );
}


Future<List<ResourceDTO>> getResources(Function onGetResult, bool isImage, dynamic appContext) async {
  List<ResourceDTO> resources = await appContext.getContext().clientAPI.resourceApi.resourceGet();
  if (onGetResult != null && isImage) {
    resources = resources.where((element) => element.type == ResourceType.image || element.type == ResourceType.imageUrl).toList();
  }
  return resources;
}