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using BorderRadius.circular().<topic_end>
<topic_start>
Complete staggered animation
Like all interactive widgets, the complete animation consists
of a widget pair: a stateless and a stateful widget.The stateless widget specifies the Tweens,
defines the Animation objects, and provides a build() function
responsible for building the animating portion of the widget tree.The stateful widget creates the controller, plays the animation,
and builds the non-animating portion of the widget tree.
The animation begins when a tap is detected anywhere in the screen.Full code for basic_staggered_animation’s main.dart<topic_end>
<topic_start>
Stateless widget: StaggerAnimation
In the stateless widget, StaggerAnimation,
the build() function instantiates an
AnimatedBuilder—a general purpose widget for building
animations. The AnimatedBuilder
builds a widget and configures it using the Tweens’ current values.
The example creates a function named _buildAnimation() (which performs
the actual UI updates), and assigns it to its builder property.
AnimatedBuilder listens to notifications from the animation controller,
marking the widget tree dirty as values change.
For each tick of the animation, the values are updated,
resulting in a call to _buildAnimation().<topic_end>
<topic_start>
Stateful widget: StaggerDemo
The stateful widget, StaggerDemo, creates the AnimationController
(the one who rules them all), specifying a 2000 ms duration. It plays
the animation, and builds the non-animating portion of the widget tree.
The animation begins when a tap is detected in the screen.
The animation runs forward, then backward.
<topic_end>
<topic_start>Create a staggered menu animation
A single app screen might contain multiple animations.
Playing all of the animations at the same time can be
overwhelming. Playing the animations one after the other
can take too long. A better option is to stagger the animations.
Each animation begins at a different time,
but the animations overlap to create a shorter duration.
In this recipe, you build a drawer menu with animated
content that is staggered and has a button that pops
in at the bottom.The following animation shows the app’s behavior:<topic_end>
<topic_start>
Create the menu without animations
The drawer menu displays a list of titles,
followed by a Get started button at
the bottom of the menu.Define a stateful widget called Menu
that displays the list and button
in static locations.
<code_start>class Menu extends StatefulWidget {
const Menu({super.key});
@override
State<Menu> createState() => _MenuState();
}
class _MenuState extends State<Menu> {
static const _menuTitles = [
'Declarative Style',
'Premade Widgets',
'Stateful Hot Reload',
'Native Performance',
'Great Community',
];
@override
Widget build(BuildContext context) {
return Container(
color: Colors.white,
child: Stack(
fit: StackFit.expand,
children: [
_buildFlutterLogo(),
_buildContent(),
],
),
);
}
Widget _buildFlutterLogo() {
// TODO: We'll implement this later.
return Container();
}
Widget _buildContent() {
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const SizedBox(height: 16),
..._buildListItems(),
const Spacer(),
_buildGetStartedButton(),
],
);
}
List<Widget> _buildListItems() {
final listItems = <Widget>[];
for (var i = 0; i < _menuTitles.length; ++i) {
listItems.add(
Padding(
padding: const EdgeInsets.symmetric(horizontal: 36, vertical: 16),
child: Text(
_menuTitles[i],
textAlign: TextAlign.left,
style: const TextStyle(
fontSize: 24,
fontWeight: FontWeight.w500,