Flutter未知功能插件flutterfall的介绍（由于介绍为undefined，基于名称推测） Flutter动画效果或界面组件插件flutterfall的使用
FlutterFall
A Flutter package to create falling effects using custom images. Customize particle properties like speed, size, rotation, total particles and wind effect, and enjoy smooth dynamic updates.
Features
- Create a falling effect using images provided by the user.
- Customizable parameters for speed, size, rotation, total particles and wind effect.
- Enhanced performance with dynamic updates using custom controllers.
- Smooth and responsive interactions with debounced property changes.
Demo
Static Controller Demo
This example shows a static falling effect with default settings.
Dynamic Controller Demo
This demo demonstrates dynamic updates using sliders to control particle properties like speed, size, wind effect, rotate effect and total particles.
Getting Started
Add this library to your pubspec.yaml:
dependencies:
flutterfall: ^1.0.6
Import it where you want to use it:
import 'package:flutterfall/flutterfall.dart';
Usage
Static Setup
Enclose your widget with FlutterFall for a static falling effect:
Scaffold(
body: FlutterFall(
isRunning: true, // Controls whether the falling effect is active.
totalParticles: 40, // Number of objects to fall
particleFallSpeed: 0.05, // Speed of falling objects
particleImages: ['assets/snowflake.png'], // List of image URLs or asset paths
particleSize: 30, // Size of the particles
particleRotationSpeed: 0.02, // Rotation speed of particles
particleWindSpeed: 1.0, // Wind speed for particle movement
),
);
Dynamic Controller Setup
For dynamic control over particle properties, use the FallController class. You can dynamically change the total Particles and other properties like speed, size, rotate effect and wind effect using sliders or other UI elements:
FallController controller = FallController();
Scaffold(
body: Column(
children: [
FlutterFall(
particleImages: ['assets/snowflake.png'], // List of image URLs or asset paths
controller: controller, // Attach controller for dynamic updates
),
Slider(
value: controller.particleFallSpeed,
min: 0.01,
max: 1.0,
onChanged: (value) {
controller.updateParticleFallSpeed(value);
},
),
Slider(
value: controller.totalParticles.toDouble(),
min: 10,
max: 100,
onChanged: (value) {
controller.updateTotalParticles(value.toInt());
},
),
Slider(
value: controller.particleSize,
min: 10,
max: 100,
onChanged: (value) {
controller.updateParticleSize(value);
},
),
Slider(
value: controller.particleWindSpeed,
min: 0.0,
max: 5.0,
onChanged: (value) {
controller.updateParticleWindSpeed(value);
},
),
Slider(
value: controller.particleRotationSpeed,
min: 0.0,
max: 1.0,
onChanged: (value) {
controller.updateParticleRotationSpeed(value);
},
),
],
),
);
Controller Overview
The FallController class allows you to update the properties of the falling particles dynamically:
FallController({
this.totalParticles = 40,
this.particleFallSpeed = 0.05,
this.particleSize = 30.0,
this.particleRotationSpeed = 0.02,
this.particleWindSpeed = 1.0,
});
Methods for Updating Properties
-
updateTotalParticles(int newTotal)- Method to update the total number of falling particles.
-
updateParticleFallSpeed(double newSpeed)- Method to update the speed of falling particles.
-
updateParticleSize(double newSize)- Method to update the size of particles.
-
updateParticleWindSpeed(double newWindSpeed)- Method to update the wind speed affecting particles.
-
updateParticleRotationSpeed(double newRotationSpeed)- Method to update the rotation speed of particles.
Additional Information
This project is inspired by GitHub - Punkachu/SnowingWidget.
Complete Example Demo
import 'dart:developer';
import 'package:flutter/material.dart';
import 'package:flutterfall/flutterfall.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
final FallController controller = FallController();
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
backgroundColor: Colors.black,
body: Stack(
children: [
// Falling particles
FlutterFall(
particleImages: ['assets/snowflake.png'],
totalParticles: 50,
particleSize: 35,
particleWindSpeed: 0.2,
particleSpeed: 0.2,
fallController: controller,
isRunning: true,
),
// Sliders and Controls wrapped in a ListView for smooth scrolling
Positioned(
bottom: 20,
left: 20,
child: SizedBox(
height: 400,
width: MediaQuery.of(context).size.width * 0.6,
child: ListView(
children: [
// Speed Slider
Row(
children: [
Text(
'Speed: ${controller.particleFallSpeed.toStringAsFixed(2)}',
style: const TextStyle(color: Colors.white),
),
Expanded(
child: Slider(
value: controller.particleFallSpeed,
min: 0.01,
max: 1.0,
divisions: 100,
onChanged: (value) {
setState(() {
controller.updateParticleFallSpeed(value);
});
},
),
),
],
),
const SizedBox(height: 10),
// Particle Size Slider
Row(
children: [
Text(
'Particle Size: ${controller.particleSize.toStringAsFixed(0)}',
style: const TextStyle(color: Colors.white),
),
Expanded(
child: Slider(
value: controller.particleSize,
min: 10.0,
max: 100.0,
divisions: 90,
onChanged: (value) {
log(value.toString());
setState(() {
controller.updateParticleSize(value);
});
},
),
),
],
),
const SizedBox(height: 10),
// Total Objects Slider
Row(
children: [
Text(
'Total Particles: ${controller.totalParticles.toInt()}',
style: const TextStyle(color: Colors.white),
),
Expanded(
child: Slider(
value: controller.totalParticles.toDouble(),
min: 10.0,
max: 500,
onChanged: (value) {
setState(() {
controller.updateTotalParticles(value.toInt());
});
},
),
),
],
),
const SizedBox(height: 10),
// Wind Speed Slider
Row(
children: [
Text(
'Wind Speed: ${controller.particleWindSpeed.toStringAsFixed(2)}',
style: const TextStyle(color: Colors.white),
),
Expanded(
child: Slider(
value: controller.particleWindSpeed,
min: 0.0,
max: 15.0,
divisions: 100,
onChanged: (value) {
setState(() {
controller.updateParticleWindSpeed(value);
});
},
),
),
],
),
const SizedBox(height: 10),
// Rotation Speed Slider
Row(
children: [
Text(
'Rotation Speed: ${controller.particleRotationSpeed.toStringAsFixed(2)}',
style: const TextStyle(color: Colors.white),
),
Expanded(
child: Slider(
value: controller.particleRotationSpeed,
min: 0.0,
max: 10.0,
divisions: 100,
onChanged: (value) {
setState(() {
controller.updateParticleRotationSpeed(value);
});
},
),
),
],
),
],
),
),
),
],
),
),
);
}
}
更多关于Flutter未知功能插件flutterfall的介绍（由于介绍为undefined，基于名称推测） Flutter动画效果或界面组件插件flutterfall的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter未知功能插件flutterfall的介绍（由于介绍为undefined，基于名称推测） Flutter动画效果或界面组件插件flutterfall的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
虽然flutterfall这个插件的具体介绍是undefined，但基于名称推测，我们可以假设它可能与Flutter中的动画效果或界面组件相关。以下是一个假设性的代码案例，展示如何在Flutter中使用一个假设的动画效果插件flutterfall。请注意，以下代码是基于假设创建的，实际插件可能有不同的API和实现方式。
假设的flutterfall插件使用示例
首先，假设flutterfall插件提供了一个名为FallAnimation的widget，用于创建下落动画效果。
1. 添加依赖
在pubspec.yaml文件中添加flutterfall依赖（注意：这一步是假设性的，实际插件需要查找正确的依赖名称和版本）：
dependencies:
flutter:
sdk: flutter
flutterfall: ^x.y.z # 假设的版本号
然后运行flutter pub get来安装依赖。
2. 使用Flutterfall插件
接下来，在Flutter应用中使用这个假设的FallAnimation widget。
import 'package:flutter/material.dart';
import 'package:flutterfall/flutterfall.dart'; // 假设的导入路径
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutterfall Animation Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: FallAnimationDemo(),
);
}
}
class FallAnimationDemo extends StatefulWidget {
@override
_FallAnimationDemoState createState() => _FallAnimationDemoState();
}
class _FallAnimationDemoState extends State<FallAnimationDemo> with SingleTickerProviderStateMixin {
late AnimationController _controller;
@override
void initState() {
super.initState();
_controller = AnimationController(
duration: const Duration(seconds: 2),
vsync: this,
)..repeat(reverse: true);
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Flutterfall Animation Demo'),
),
body: Center(
child: FallAnimation(
animation: _controller,
child: Container(
width: 100,
height: 100,
color: Colors.red,
child: Center(
child: Text(
'Fall',
style: TextStyle(color: Colors.white, fontSize: 24),
),
),
),
),
),
);
}
}
// 假设的 FallAnimation widget 定义（基于名称推测）
// 注意：以下代码是假设性的，实际插件的API可能不同
class FallAnimation extends AnimatedWidget {
final Widget child;
FallAnimation({
Key? key,
required Animation<double> animation,
required this.child,
}) : super(key: key, listenable: animation);
@override
Widget build(BuildContext context) {
final Animation<double> animation = listenable as Animation<double>;
// 假设的动画实现，可能涉及Transform等widget
return Transform.translate(
offset: Offset(0, -animation.value * 300), // 假设的下落距离
child: child,
);
}
}
注意
- 实际插件可能不同：上述代码是基于对
flutterfall插件名称的推测编写的，实际插件可能有不同的API和实现方式。 - 查阅文档：在使用任何第三方插件时，务必查阅其官方文档以了解正确的使用方法和API。
- 错误处理：在实际开发中，还需要添加错误处理和状态管理逻辑以确保应用的健壮性。
由于flutterfall插件的具体信息未知，上述代码仅作为示例，展示了如何在Flutter中假设性地使用一个动画效果插件。
