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samples/veggieseasons/lib/screens/settings.dart

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// Copyright 2018 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:scoped_model/scoped_model.dart';
import 'package:veggieseasons/data/preferences.dart';
import 'package:veggieseasons/data/veggie.dart';
import 'package:veggieseasons/styles.dart';
import 'package:veggieseasons/widgets/settings_group.dart';
import 'package:veggieseasons/widgets/settings_item.dart';
class VeggieCategorySettingsScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
final model = ScopedModel.of<Preferences>(context, rebuildOnChange: true);
final currentPrefs = model.preferredCategories;
return CupertinoPageScaffold(
navigationBar: CupertinoNavigationBar(
middle: Text('Preferred Categories'),
previousPageTitle: 'Settings',
),
backgroundColor: Styles.scaffoldBackground,
child: FutureBuilder<Set<VeggieCategory>>(
future: currentPrefs,
builder: (context, snapshot) {
final items = <SettingsItem>[];
for (final category in VeggieCategory.values) {
CupertinoSwitch toggle;
// It's possible that category data hasn't loaded from shared prefs
// yet, so display it if possible and fall back to disabled switches
// otherwise.
if (snapshot.hasData) {
toggle = CupertinoSwitch(
value: snapshot.data.contains(category),
onChanged: (value) {
if (value) {
model.addPreferredCategory(category);
} else {
model.removePreferredCategory(category);
}
},
);
} else {
toggle = CupertinoSwitch(
value: false,
onChanged: null,
);
}
items.add(SettingsItem(
label: veggieCategoryNames[category],
content: toggle,
));
}
return ListView(
children: [
SettingsGroup(
items: items,
),
],
);
},
),
);
}
}
class CalorieSettingsScreen extends StatelessWidget {
static const max = 1000;
static const min = 2600;
static const step = 200;
@override
Widget build(BuildContext context) {
final model = ScopedModel.of<Preferences>(context, rebuildOnChange: true);
return CupertinoPageScaffold(
navigationBar: CupertinoNavigationBar(
previousPageTitle: 'Settings',
),
backgroundColor: Styles.scaffoldBackground,
child: ListView(
children: [
FutureBuilder<int>(
future: model.desiredCalories,
builder: (context, snapshot) {
final steps = <SettingsItem>[];
for (int cals = max; cals < min; cals += step) {
steps.add(
SettingsItem(
label: cals.toString(),
icon: SettingsIcon(
icon: Styles.checkIcon,
foregroundColor: snapshot.hasData && snapshot.data == cals
? CupertinoColors.activeBlue
: Styles.transparentColor,
backgroundColor: Styles.transparentColor,
),
onPress: snapshot.hasData
? () => model.setDesiredCalories(cals)
: null,
),
);
}
return SettingsGroup(
items: steps,
header: SettingsGroupHeader('Available calorie levels'),
footer: SettingsGroupFooter('These are used for serving '
'calculations'),
);
},
),
],
),
);
}
}
class SettingsScreen extends StatelessWidget {
Widget _buildCaloriesItem(BuildContext context, Preferences prefs) {
return SettingsItem(
label: 'Calorie Target',
icon: SettingsIcon(
backgroundColor: Styles.iconBlue,
icon: Styles.calorieIcon,
),
content: FutureBuilder<int>(
future: prefs.desiredCalories,
builder: (context, snapshot) {
return Row(
children: [
Text(snapshot.data?.toString() ?? ''),
SizedBox(width: 8.0),
SettingsNavigationIndicator(),
],
);
},
),
onPress: () {
Navigator.of(context).push(
CupertinoPageRoute(
builder: (context) => CalorieSettingsScreen(),
title: 'Calorie Target',
),
);
},
);
}
Widget _buildCategoriesItem(BuildContext context, Preferences prefs) {
return SettingsItem(
label: 'Preferred Categories',
subtitle: 'What types of veggies you prefer!',
icon: SettingsIcon(
backgroundColor: Styles.iconGold,
icon: Styles.preferenceIcon,
),
content: SettingsNavigationIndicator(),
onPress: () {
Navigator.of(context).push(
CupertinoPageRoute(
builder: (context) => VeggieCategorySettingsScreen(),
title: 'Preferred Categories',
),
);
},
);
}
@override
Widget build(BuildContext context) {
final prefs = ScopedModel.of<Preferences>(context, rebuildOnChange: true);
return CupertinoPageScaffold(
child: Container(
color: Styles.scaffoldBackground,
child: CustomScrollView(
slivers: <Widget>[
CupertinoSliverNavigationBar(
largeTitle: Text('Settings'),
),
SliverSafeArea(
top: false,
sliver: SliverList(
delegate: SliverChildListDelegate(
<Widget>[
SettingsGroup(
items: [
_buildCaloriesItem(context, prefs),
_buildCategoriesItem(context, prefs),
],
),
],
),
),
),
],
),
),
);
}
}