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samples/material_3_demo/lib/home.dart

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// Copyright 2021 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/material.dart';
import 'color_palettes_screen.dart';
import 'component_screen.dart';
import 'constants.dart';
import 'elevation_screen.dart';
import 'typography_screen.dart';
class Home extends StatefulWidget {
const Home({
super.key,
required this.useLightMode,
required this.useMaterial3,
required this.colorSelected,
required this.handleBrightnessChange,
required this.handleMaterialVersionChange,
required this.handleColorSelect,
});
final bool useLightMode;
final bool useMaterial3;
final ColorSeed colorSelected;
final void Function(bool useLightMode) handleBrightnessChange;
final void Function() handleMaterialVersionChange;
final void Function(int value) handleColorSelect;
@override
State<Home> createState() => _HomeState();
}
class _HomeState extends State<Home> with SingleTickerProviderStateMixin {
final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
late final AnimationController controller;
late final CurvedAnimation railAnimation;
bool controllerInitialized = false;
bool showMediumSizeLayout = false;
bool showLargeSizeLayout = false;
int screenIndex = ScreenSelected.component.value;
@override
initState() {
super.initState();
controller = AnimationController(
duration: Duration(milliseconds: transitionLength.toInt() * 2),
value: 0,
vsync: this,
);
railAnimation = CurvedAnimation(
parent: controller,
curve: const Interval(0.5, 1.0),
);
}
@override
void dispose() {
controller.dispose();
super.dispose();
}
@override
void didChangeDependencies() {
super.didChangeDependencies();
final double width = MediaQuery.of(context).size.width;
final AnimationStatus status = controller.status;
if (width > mediumWidthBreakpoint) {
if (width > largeWidthBreakpoint) {
showMediumSizeLayout = false;
showLargeSizeLayout = true;
} else {
showMediumSizeLayout = true;
showLargeSizeLayout = false;
}
if (status != AnimationStatus.forward &&
status != AnimationStatus.completed) {
controller.forward();
}
} else {
showMediumSizeLayout = false;
showLargeSizeLayout = false;
if (status != AnimationStatus.reverse &&
status != AnimationStatus.dismissed) {
controller.reverse();
}
}
if (!controllerInitialized) {
controllerInitialized = true;
controller.value = width > mediumWidthBreakpoint ? 1 : 0;
}
}
void handleScreenChanged(int screenSelected) {
setState(() {
screenIndex = screenSelected;
});
}
Widget createScreenFor(
ScreenSelected screenSelected, bool showNavBarExample) {
switch (screenSelected) {
case ScreenSelected.component:
return Expanded(
child: OneTwoTransition(
animation: railAnimation,
one: FirstComponentList(
showNavBottomBar: showNavBarExample,
scaffoldKey: scaffoldKey,
showSecondList: showMediumSizeLayout || showLargeSizeLayout),
two: SecondComponentList(
scaffoldKey: scaffoldKey,
),
),
);
case ScreenSelected.color:
return const ColorPalettesScreen();
case ScreenSelected.typography:
return const TypographyScreen();
case ScreenSelected.elevation:
return const ElevationScreen();
default:
return FirstComponentList(
showNavBottomBar: showNavBarExample,
scaffoldKey: scaffoldKey,
showSecondList: showMediumSizeLayout || showLargeSizeLayout);
}
}
PreferredSizeWidget createAppBar() {
return AppBar(
title: widget.useMaterial3
? const Text('Material 3')
: const Text('Material 2'),
actions: !showMediumSizeLayout && !showLargeSizeLayout
? [
_BrightnessButton(
handleBrightnessChange: widget.handleBrightnessChange,
),
_Material3Button(
handleMaterialVersionChange: widget.handleMaterialVersionChange,
),
_ColorSeedButton(
handleColorSelect: widget.handleColorSelect,
colorSelected: widget.colorSelected,
),
]
: [Container()],
);
}
Widget _expandedTrailingActions() => Container(
constraints: const BoxConstraints.tightFor(width: 250),
padding: const EdgeInsets.symmetric(horizontal: 30),
child: Column(
mainAxisAlignment: MainAxisAlignment.end,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Row(
children: [
const Text('Brightness'),
Expanded(child: Container()),
Switch(
value: widget.useLightMode,
onChanged: (value) {
widget.handleBrightnessChange(value);
})
],
),
Row(
children: [
widget.useMaterial3
? const Text('Material 3')
: const Text('Material 2'),
Expanded(child: Container()),
Switch(
value: widget.useMaterial3,
onChanged: (_) {
widget.handleMaterialVersionChange();
})
],
),
const Divider(),
ConstrainedBox(
constraints: const BoxConstraints(maxHeight: 200.0),
child: GridView.count(
crossAxisCount: 3,
children: List.generate(
ColorSeed.values.length,
(i) => IconButton(
icon: const Icon(Icons.radio_button_unchecked),
color: ColorSeed.values[i].color,
isSelected: widget.colorSelected.color ==
ColorSeed.values[i].color,
selectedIcon: const Icon(Icons.circle),
onPressed: () {
widget.handleColorSelect(i);
},
)),
),
),
],
),
);
Widget _trailingActions() => Column(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Flexible(
child: _BrightnessButton(
handleBrightnessChange: widget.handleBrightnessChange,
showTooltipBelow: false,
),
),
Flexible(
child: _Material3Button(
handleMaterialVersionChange: widget.handleMaterialVersionChange,
showTooltipBelow: false,
),
),
Flexible(
child: _ColorSeedButton(
handleColorSelect: widget.handleColorSelect,
colorSelected: widget.colorSelected,
),
),
],
);
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
animation: controller,
builder: (context, child) {
return NavigationTransition(
scaffoldKey: scaffoldKey,
animationController: controller,
railAnimation: railAnimation,
appBar: createAppBar(),
body: createScreenFor(
ScreenSelected.values[screenIndex], controller.value == 1),
navigationRail: NavigationRail(
extended: showLargeSizeLayout,
destinations: navRailDestinations,
selectedIndex: screenIndex,
onDestinationSelected: (index) {
setState(() {
screenIndex = index;
handleScreenChanged(screenIndex);
});
},
trailing: Expanded(
child: Padding(
padding: const EdgeInsets.only(bottom: 20),
child: showLargeSizeLayout
? _expandedTrailingActions()
: _trailingActions(),
),
),
),
navigationBar: NavigationBars(
onSelectItem: (index) {
setState(() {
screenIndex = index;
handleScreenChanged(screenIndex);
});
},
selectedIndex: screenIndex,
isExampleBar: false,
),
);
},
);
}
}
class _BrightnessButton extends StatelessWidget {
const _BrightnessButton({
required this.handleBrightnessChange,
this.showTooltipBelow = true,
});
final Function handleBrightnessChange;
final bool showTooltipBelow;
@override
Widget build(BuildContext context) {
final isBright = Theme.of(context).brightness == Brightness.light;
return Tooltip(
preferBelow: showTooltipBelow,
message: 'Toggle brightness',
child: IconButton(
icon: isBright
? const Icon(Icons.dark_mode_outlined)
: const Icon(Icons.light_mode_outlined),
onPressed: () => handleBrightnessChange(!isBright),
),
);
}
}
class _Material3Button extends StatelessWidget {
const _Material3Button({
required this.handleMaterialVersionChange,
this.showTooltipBelow = true,
});
final void Function() handleMaterialVersionChange;
final bool showTooltipBelow;
@override
Widget build(BuildContext context) {
final useMaterial3 = Theme.of(context).useMaterial3;
return Tooltip(
preferBelow: showTooltipBelow,
message: 'Switch to Material ${useMaterial3 ? 2 : 3}',
child: IconButton(
icon: useMaterial3
? const Icon(Icons.filter_2)
: const Icon(Icons.filter_3),
onPressed: handleMaterialVersionChange,
),
);
}
}
class _ColorSeedButton extends StatelessWidget {
const _ColorSeedButton({
required this.handleColorSelect,
required this.colorSelected,
});
final void Function(int) handleColorSelect;
final ColorSeed colorSelected;
@override
Widget build(BuildContext context) {
return PopupMenuButton(
icon: Icon(
Icons.palette_outlined,
color: Theme.of(context).colorScheme.onSurfaceVariant,
),
tooltip: 'Select a seed color',
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
itemBuilder: (context) {
return List.generate(ColorSeed.values.length, (index) {
ColorSeed currentColor = ColorSeed.values[index];
return PopupMenuItem(
value: index,
enabled: currentColor != colorSelected,
child: Wrap(
children: [
Padding(
padding: const EdgeInsets.only(left: 10),
child: Icon(
currentColor == colorSelected
? Icons.color_lens
: Icons.color_lens_outlined,
color: currentColor.color,
),
),
Padding(
padding: const EdgeInsets.only(left: 20),
child: Text(currentColor.label),
),
],
),
);
});
},
onSelected: handleColorSelect,
);
}
}
class NavigationTransition extends StatefulWidget {
const NavigationTransition(
{super.key,
required this.scaffoldKey,
required this.animationController,
required this.railAnimation,
required this.navigationRail,
required this.navigationBar,
required this.appBar,
required this.body});
final GlobalKey<ScaffoldState> scaffoldKey;
final AnimationController animationController;
final CurvedAnimation railAnimation;
final Widget navigationRail;
final Widget navigationBar;
final PreferredSizeWidget appBar;
final Widget body;
@override
State<NavigationTransition> createState() => _NavigationTransitionState();
}
class _NavigationTransitionState extends State<NavigationTransition> {
late final AnimationController controller;
late final CurvedAnimation railAnimation;
late final ReverseAnimation barAnimation;
bool controllerInitialized = false;
bool showDivider = false;
@override
void initState() {
super.initState();
controller = widget.animationController;
railAnimation = widget.railAnimation;
barAnimation = ReverseAnimation(
CurvedAnimation(
parent: controller,
curve: const Interval(0.0, 0.5),
),
);
}
@override
Widget build(BuildContext context) {
final ColorScheme colorScheme = Theme.of(context).colorScheme;
return Scaffold(
key: widget.scaffoldKey,
appBar: widget.appBar,
body: Row(
children: <Widget>[
RailTransition(
animation: railAnimation,
backgroundColor: colorScheme.surface,
child: widget.navigationRail,
),
widget.body,
],
),
bottomNavigationBar: BarTransition(
animation: barAnimation,
backgroundColor: colorScheme.surface,
child: widget.navigationBar,
),
endDrawer: const NavigationDrawerSection(),
);
}
}
final List<NavigationRailDestination> navRailDestinations = appBarDestinations
.map(
(destination) => NavigationRailDestination(
icon: Tooltip(
message: destination.label,
child: destination.icon,
),
selectedIcon: Tooltip(
message: destination.label,
child: destination.selectedIcon,
),
label: Text(destination.label),
),
)
.toList();
class SizeAnimation extends CurvedAnimation {
SizeAnimation(Animation<double> parent)
: super(
parent: parent,
curve: const Interval(
0.2,
0.8,
curve: Curves.easeInOutCubicEmphasized,
),
reverseCurve: Interval(
0,
0.2,
curve: Curves.easeInOutCubicEmphasized.flipped,
),
);
}
class OffsetAnimation extends CurvedAnimation {
OffsetAnimation(Animation<double> parent)
: super(
parent: parent,
curve: const Interval(
0.4,
1.0,
curve: Curves.easeInOutCubicEmphasized,
),
reverseCurve: Interval(
0,
0.2,
curve: Curves.easeInOutCubicEmphasized.flipped,
),
);
}
class RailTransition extends StatefulWidget {
const RailTransition(
{super.key,
required this.animation,
required this.backgroundColor,
required this.child});
final Animation<double> animation;
final Widget child;
final Color backgroundColor;
@override
State<RailTransition> createState() => _RailTransition();
}
class _RailTransition extends State<RailTransition> {
late Animation<Offset> offsetAnimation;
late Animation<double> widthAnimation;
@override
void didChangeDependencies() {
super.didChangeDependencies();
// The animations are only rebuilt by this method when the text
// direction changes because this widget only depends on Directionality.
final bool ltr = Directionality.of(context) == TextDirection.ltr;
widthAnimation = Tween<double>(
begin: 0,
end: 1,
).animate(SizeAnimation(widget.animation));
offsetAnimation = Tween<Offset>(
begin: ltr ? const Offset(-1, 0) : const Offset(1, 0),
end: Offset.zero,
).animate(OffsetAnimation(widget.animation));
}
@override
Widget build(BuildContext context) {
return ClipRect(
child: DecoratedBox(
decoration: BoxDecoration(color: widget.backgroundColor),
child: Align(
alignment: Alignment.topLeft,
widthFactor: widthAnimation.value,
child: FractionalTranslation(
translation: offsetAnimation.value,
child: widget.child,
),
),
),
);
}
}
class BarTransition extends StatefulWidget {
const BarTransition(
{super.key,
required this.animation,
required this.backgroundColor,
required this.child});
final Animation<double> animation;
final Color backgroundColor;
final Widget child;
@override
State<BarTransition> createState() => _BarTransition();
}
class _BarTransition extends State<BarTransition> {
late final Animation<Offset> offsetAnimation;
late final Animation<double> heightAnimation;
@override
void initState() {
super.initState();
offsetAnimation = Tween<Offset>(
begin: const Offset(0, 1),
end: Offset.zero,
).animate(OffsetAnimation(widget.animation));
heightAnimation = Tween<double>(
begin: 0,
end: 1,
).animate(SizeAnimation(widget.animation));
}
@override
Widget build(BuildContext context) {
return ClipRect(
child: DecoratedBox(
decoration: BoxDecoration(color: widget.backgroundColor),
child: Align(
alignment: Alignment.topLeft,
heightFactor: heightAnimation.value,
child: FractionalTranslation(
translation: offsetAnimation.value,
child: widget.child,
),
),
),
);
}
}
class OneTwoTransition extends StatefulWidget {
const OneTwoTransition({
super.key,
required this.animation,
required this.one,
required this.two,
});
final Animation<double> animation;
final Widget one;
final Widget two;
@override
State<OneTwoTransition> createState() => _OneTwoTransitionState();
}
class _OneTwoTransitionState extends State<OneTwoTransition> {
late final Animation<Offset> offsetAnimation;
late final Animation<double> widthAnimation;
@override
void initState() {
super.initState();
offsetAnimation = Tween<Offset>(
begin: const Offset(1, 0),
end: Offset.zero,
).animate(OffsetAnimation(widget.animation));
widthAnimation = Tween<double>(
begin: 0,
end: mediumWidthBreakpoint,
).animate(SizeAnimation(widget.animation));
}
@override
Widget build(BuildContext context) {
return Row(
children: <Widget>[
Flexible(
flex: mediumWidthBreakpoint.toInt(),
child: widget.one,
),
if (widthAnimation.value.toInt() > 0) ...[
Flexible(
flex: widthAnimation.value.toInt(),
child: FractionalTranslation(
translation: offsetAnimation.value,
child: widget.two,
),
)
],
],
);
}
}