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Flutter_Documentation

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icon: _isDrawerOpen() || _isDrawerOpening()
? const Icon(
Icons.clear,
color: Colors.black,
)
: const Icon(
Icons.menu,
color: Colors.black,
),
);
},
),
],
);
}
Widget _buildContent() {
// Put page content here.
return const SizedBox();
}
Widget _buildDrawer() {
return AnimatedBuilder(
animation: _drawerSlideController,
builder: (context, child) {
return FractionalTranslation(
translation: Offset(1.0 - _drawerSlideController.value, 0.0),
child: _isDrawerClosed() ? const SizedBox() : const Menu(),
);
},
);
}
}
class Menu extends StatefulWidget {
const Menu({super.key});
@override
State<Menu> createState() => _MenuState();
}
class _MenuState extends State<Menu> with SingleTickerProviderStateMixin {
static const _menuTitles = [
'Declarative style',
'Premade widgets',
'Stateful hot reload',
'Native performance',
'Great community',
];
static const _initialDelayTime = Duration(milliseconds: 50);
static const _itemSlideTime = Duration(milliseconds: 250);
static const _staggerTime = Duration(milliseconds: 50);
static const _buttonDelayTime = Duration(milliseconds: 150);
static const _buttonTime = Duration(milliseconds: 500);
final _animationDuration = _initialDelayTime +
(_staggerTime * _menuTitles.length) +
_buttonDelayTime +
_buttonTime;
late AnimationController _staggeredController;
final List<Interval> _itemSlideIntervals = [];
late Interval _buttonInterval;
@override
void initState() {
super.initState();
_createAnimationIntervals();
_staggeredController = AnimationController(
vsync: this,
duration: _animationDuration,
)..forward();
}
void _createAnimationIntervals() {
for (var i = 0; i < _menuTitles.length; ++i) {
final startTime = _initialDelayTime + (_staggerTime * i);
final endTime = startTime + _itemSlideTime;
_itemSlideIntervals.add(
Interval(
startTime.inMilliseconds / _animationDuration.inMilliseconds,
endTime.inMilliseconds / _animationDuration.inMilliseconds,
),
);
}
final buttonStartTime =
Duration(milliseconds: (_menuTitles.length * 50)) + _buttonDelayTime;
final buttonEndTime = buttonStartTime + _buttonTime;
_buttonInterval = Interval(
buttonStartTime.inMilliseconds / _animationDuration.inMilliseconds,
buttonEndTime.inMilliseconds / _animationDuration.inMilliseconds,
);
}
@override
void dispose() {
_staggeredController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Container(
color: Colors.white,
child: Stack(
fit: StackFit.expand,
children: [
_buildFlutterLogo(),
_buildContent(),
],
),