在小部件(而不是屏幕)之间抖动英雄动画

Question

英雄动画最适合在屏幕之间导航，但我需要在小部件之间使用相同的动画。例如，一张卡移动到另一个地方:产品卡移动到购物车和其他东西。谢谢你的回答!

Answer 1

试试这个，add_to_cart_animation:

import 'package:add_to_cart_animation/add_to_cart_animation.dart';
import 'package:add_to_cart_animation/add_to_cart_icon.dart';
import 'package:flutter/material.dart';
import 'list_item.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Add To Cart Animation',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Add To Cart Animation'),
debugShowCheckedModeBanner: false,
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
// We can detech the location of the card by this  GlobalKey<CartIconKey>
GlobalKey<CartIconKey> gkCart = GlobalKey<CartIconKey>();
late Function(GlobalKey) runAddToCardAnimation;
var _cartQuantityItems = 0;
@override
Widget build(BuildContext context) {
return AddToCartAnimation(
// To send the library the location of the Cart icon
gkCart: gkCart,
rotation: true,
dragToCardCurve: Curves.easeIn,
dragToCardDuration: const Duration(milliseconds: 1000),
previewCurve: Curves.linearToEaseOut,
previewDuration: const Duration(milliseconds: 500),
previewHeight: 30,
previewWidth: 30,
opacity: 0.85,
initiaJump: false,
receiveCreateAddToCardAnimationMethod: (addToCardAnimationMethod) {
// You can run the animation by addToCardAnimationMethod, just pass trough the the global key of  the image as parameter
this.runAddToCardAnimation = addToCardAnimationMethod;
},
child: Scaffold(
appBar: AppBar(
title: Text(widget.title),
centerTitle: false,
actions: [
// Improvement/Suggestion 4.4 -> Adding 'clear-cart-button'
IconButton(
icon: Icon(Icons.cleaning_services),
onPressed: () {
_cartQuantityItems = 0;
gkCart.currentState!.runClearCartAnimation();
},
),
SizedBox(width: 16),
AddToCartIcon(
key: gkCart,
icon: Icon(Icons.shopping_cart),
colorBadge: Colors.red,
),
SizedBox(
width: 16,
)
],
),
body: ListView(
children: [
AppListItem(onClick: listClick, index: 1),
AppListItem(onClick: listClick, index: 2),
AppListItem(onClick: listClick, index: 3),
AppListItem(onClick: listClick, index: 4),
AppListItem(onClick: listClick, index: 5),
AppListItem(onClick: listClick, index: 6),
AppListItem(onClick: listClick, index: 7),
],
),
),
);
}
// Improvement/Suggestion 4.4 -> Running AddTOCartAnimation BEFORE runCArtAnimation
void listClick(GlobalKey gkImageContainer) async {
await runAddToCardAnimation(gkImageContainer);
await gkCart.currentState!.runCartAnimation((++_cartQuantityItems).toString());
}
}

或

[not null safety]这是一个添加到购物车的示例，add_cart_抛物线:

import 'dart:ui';
import 'package:add_cart_parabola/add_cart_parabola.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
GlobalKey floatKey = GlobalKey();
GlobalKey rootKey = GlobalKey();
Offset floatOffset ;
@override
void initState() {
super.initState();
WidgetsBinding.instance.addPostFrameCallback((_){
RenderBox renderBox = floatKey.currentContext.findRenderObject();
floatOffset = renderBox.localToGlobal(Offset.zero);
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
key: rootKey,
width: double.infinity,
height: double.infinity,
color: Colors.grey,
child: ListView(
children: List.generate(40, (index){
return generateItem(index);
}).toList(),
),
),
floatingActionButton: FloatingActionButton(
backgroundColor: Colors.yellow,
key: floatKey,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
Widget generateItem(int index){
Text text = Text("item $index",style: TextStyle(fontSize:
25),);
Offset temp;
return GestureDetector(
onPanDown: (details){
temp = new Offset(details.globalPosition.dx, details.globalPosition
.dy);
},
onTap: (){
Function callback ;
setState(() {
OverlayEntry entry = OverlayEntry(
builder: (ctx){
return ParabolaAnimateWidget(rootKey,temp,floatOffset,
Icon(Icons.cancel,color: Colors.greenAccent,),callback,);
}
);
callback = (status){
if(status == AnimationStatus.completed){
entry?.remove();
}
};
Overlay.of(rootKey.currentContext).insert(entry);
});
},
child: Container(
color: Colors.orange,
child: text,
),
);
}
}

Answer 2

对于在同一屏幕中的动画小部件，您可以使用animatedlocated widget，参见下面的代码

import 'dart:math';
import 'package:flutter/material.dart';
class AnimatedPositionedDemo extends StatefulWidget {
const AnimatedPositionedDemo({Key? key}) : super(key: key);
static String routeName = 'animated_positioned';
@override
_AnimatedPositionedDemoState createState() => _AnimatedPositionedDemoState();
}
class _AnimatedPositionedDemoState extends State<AnimatedPositionedDemo> {
late double topPosition;
late double leftPosition;
double generateTopPosition(double top) => Random().nextDouble() * top;
double generateLeftPosition(double left) => Random().nextDouble() * left;
@override
void initState() {
super.initState();
topPosition = generateTopPosition(30);
leftPosition = generateLeftPosition(30);
}
void changePosition(double top, double left) {
setState(() {
topPosition = generateTopPosition(top);
leftPosition = generateLeftPosition(left);
});
}
@override
Widget build(BuildContext context) {
final size = MediaQuery.of(context).size;
final appBar = AppBar(title: const Text('AnimatedPositioned'));
final topPadding = MediaQuery.of(context).padding.top;
// AnimatedPositioned animates changes to a widget's position within a Stack
return Scaffold(
appBar: appBar,
body: SizedBox(
height: size.height,
width: size.width,
child: Stack(
children: [
AnimatedPositioned(
top: topPosition,
left: leftPosition,
duration: const Duration(seconds: 1),
child: InkWell(
onTap: () => changePosition(
size.height -
(appBar.preferredSize.height + topPadding + 50),
size.width - 150),
child: Container(
alignment: Alignment.center,
width: 150,
height: 50,
child: Text(
'Click Me',
style: TextStyle(
color:
Theme.of(context).buttonTheme.colorScheme!.onPrimary,
),
),
color: Theme.of(context).primaryColor,
),
),
),
],
),
),
);
}
}

我希望它对你有用

Answer 3

对于动画小部件，flutter团队在youtube上提供了一个视频

你可以在他们的网站上看到他们的所有信息