130 lines
4.6 KiB
Dart
130 lines
4.6 KiB
Dart
import 'dart:core';
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import 'dart:async';
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import 'package:aitrainer_app/util/loading_screen.dart';
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import 'package:aitrainer_app/widgets/home.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/scheduler.dart';
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import 'package:aitrainer_app/util/message_state.dart';
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/// The custom state that is used by the Loading Screen widget to handle the
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/// messages that are provided by the initializer methods.
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///
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/// Note: Although the class is not exported from the package as not required by
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/// the implementers using the package, the protected metatag is added to make
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/// the code clearer.
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@protected
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class LoadingScreenState extends MessageState<LoadingScreen> {
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/// Initialise the state
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@override
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void initState() {
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super.initState();
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/// If the LoadingScreen widget has an initial message set, then the default
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/// message in the MessageState class needs to be updated
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if (widget.initialMessage != null) {
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initialMessage = widget.initialMessage;
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}
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/// We require the initializers to run after the loading screen is rendered
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SchedulerBinding.instance.addPostFrameCallback((_) {
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runInitTasks();
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});
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}
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/// This method calls the initializers and once they complete redirects to
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/// the widget provided in navigateAfterInit
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@protected
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Future runInitTasks() async {
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print(" ----- runInitTasks");
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/// Run each initializer method sequentially
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Future.forEach(widget.initializers, (init) => init(this, callbackFunction)).whenComplete(() {
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// When all the initializers has been called and terminated their
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// execution. The screen is navigated to the next scaffolding widget
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if (widget.navigateToWidget is String) {
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// It's fairly safe to assume this is using the in-built material
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// named route component
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print(" ----- navigate to " + widget.navigateToWidget);
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Navigator.of(context).pushReplacementNamed(widget.navigateToWidget);
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} else if (widget.navigateToWidget is Widget) {
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Navigator.of(context).pushReplacement(new MaterialPageRoute(
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builder: (BuildContext context) => widget.navigateToWidget));
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print(" ----- navigate to main ");
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} else {
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throw new ArgumentError(
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'widget.navigateAfterSeconds must either be a String or Widget');
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}
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});
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}
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void callbackFunction() {
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print("Call Home callback if widget");
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if (widget.navigateToWidget is Widget) {
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AitrainerHome home = widget.navigateToWidget as AitrainerHome;
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home.callback();
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}
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}
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/// Render the LoadingScreen widget
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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backgroundColor: widget.backgroundColor,
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body: new InkWell(
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child: new Stack(
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fit: StackFit.expand,
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children: <Widget>[
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/// Paint the area where the inner widgets are loaded with the
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/// background to keep consistency with the screen background
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new Container(
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decoration: BoxDecoration(color: widget.backgroundColor),
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),
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/// Render the background image
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new Container(
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child: widget.image,
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),
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/// Render the Title widget, loader and messages below each other
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new Column(
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mainAxisAlignment: MainAxisAlignment.start,
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children: <Widget>[
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new Expanded(
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flex: 3,
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child: new Container(
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child: new Column(
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mainAxisAlignment: MainAxisAlignment.start,
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children: <Widget>[
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new Padding(
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padding: const EdgeInsets.only(top: 30.0),
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),
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widget.title,
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],
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)),
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),
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Expanded(
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flex: 1,
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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/// Loader Animation Widget
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CircularProgressIndicator(
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valueColor: new AlwaysStoppedAnimation<Color>(
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widget.loaderColor),
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),
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Padding(
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padding: const EdgeInsets.only(top: 20.0),
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),
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Text(getMessage, style: widget.styleTextUnderTheLoader),
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],
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),
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),
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],
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),
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],
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),
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),
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);
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}
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}
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