cloudsolutions-atoms/lib/new_views/common_widgets/app_loading_manager.dart

import 'package:flutter/material.dart';
import 'package:test_sa/extensions/context_extension.dart';
import 'package:test_sa/extensions/int_extensions.dart';
import 'package:test_sa/new_views/common_widgets/app_lazy_loading.dart';

import '../app_style/app_color.dart';

class AppLoadingManager extends StatefulWidget {
  final bool isLoading;
  final bool isFailedLoading;
  final bool isNotPage;
  final int progress;
  final bool askOnBack;
  final int stateCode;
  final Future<void> Function() onRefresh;
  final Widget child;

  const AppLoadingManager({
    Key key,
    @required this.isLoading,
    @required this.isFailedLoading,
    @required this.stateCode,
    @required this.onRefresh,
    @required this.child,
    this.progress,
    this.isNotPage = false,
    this.askOnBack = false,
  }) : super(key: key);

  @override
  State<AppLoadingManager> createState() => _AppLoadingManagerState();
}

class _AppLoadingManagerState extends State<AppLoadingManager> {
  @override
  void initState() {
    if (widget.onRefresh != null && widget.stateCode == null) {
      WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
        widget.onRefresh();
      });
    }
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    Widget placeHolder;
    // to load data if load not start
    if (widget.isLoading != true && widget.stateCode == null) {
      WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
        widget.onRefresh();
      });
    }

    // if loading of still not start in loading (true or null)
    // return loading widget
    if (widget.isLoading != false || widget.stateCode == null) {
      placeHolder = Container(
        height: 60.toScreenHeight,
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(10),
          color: context.isDark ? AppColor.neutral50 : Colors.white,
        ),
        child: const AppLazyLoading(),
      );
    } else if (widget.isFailedLoading && !widget.isNotPage) {
      // if failed return failed widget
      placeHolder = Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(context.translation.httpError, style: Theme.of(context).textTheme.titleMedium),
            4.height,
            OutlinedButton(
              onPressed: widget.onRefresh,
              child: Text(context.translation.tryAgain),
            )
          ],
        ),
      );
    }

    // if load end successfully return loaded widget
    return RefreshIndicator(
      onRefresh: () async {
        await widget.onRefresh();
      },
      child: AnimatedSwitcher(
        duration: const Duration(milliseconds: 400),
        child: placeHolder ?? widget.child,
      ),
    );
  }
}