animated gradient border in flutter flutter animation tutorial
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creating an animated gradient border in flutter can give your app a modern and visually appealing look. in this tutorial, we will create a simple widget with an animated gradient border that you can customize as needed.
step-by-step guide
1. setting up flutter project
first, make sure you have flutter installed on your machine. create a new flutter project if you haven't done so already:
```bash
flutter create animated_gradient_border
cd animated_gradient_border
```
2. adding dependencies
you may want to use the flutter `animation` library, but for our purposes, the built-in flutter widgets will suffice. however, if you want to use external libraries for more complex animations, you can add them in `pubspec.yaml`.
for this tutorial, we will work with only the core flutter libraries.
3. creating the animated gradient border widget
create a new dart file named `animated_gradient_border.dart` in the `lib` folder. this file will contain our custom animated gradient border widget.
```dart
import 'package:flutter/material.dart';
class animatedgradientborder extends statefulwidget {
final widget child;
final double borderwidth;
final listcolor colors;
animatedgradientborder({
required this.child,
this.borderwidth = 5.0,
required this.colors,
});
@override
_animatedgradientborderstate createstate() = _animatedgradientborderstate();
}
class _animatedgradientborderstate extends stateanimatedgradientborder
with singletickerproviderstatemixin {
late animationcontroller _controller;
late animationdouble _animation;
@override
void initstate() {
super.initstate();
_controller = animationcontroller(
duration: const duration(seconds: 3),
vsync: this,
)..repeat(reverse: true);
_animation = tweendouble(begin: 0.0, end: 1.0).animate(_controller);
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
widget build(buildcontext context) {
retu ...
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