如何在颤动中为容器设置动画边框 [英] How to animate border for a container in flutter

问题描述

我想用颤动的发光效果为我的容器的边框设置动画，你知道吗?

I want to animate the border for my container with a glowing effect in flutter, do you have any idea ?

推荐答案

感谢 Lakhwinder Singh，我编写了这段代码，它实现了我所要求的发光效果:

Thanks to Lakhwinder Singh, I made this code and it does the glowing effect that I asked:

import 'package:flutter/material.dart';

void main()  {
  runApp(new Test());
}

class Test extends StatefulWidget {
  @override
  _TestState createState() => _TestState();
}

class _TestState extends State<Test> with TickerProviderStateMixin {

  AnimationController _resizableController;

  static Color colorVariation(int note){
    if(note <= 1){
      return Colors.blue[50];
    }else if(note>1 && note<=2){
      return Colors.blue[100];
    }else if(note>2 && note<=3){
      return Colors.blue[200];
    }else if(note>3 && note<=4){
      return Colors.blue[300];
    }else if(note>4 && note<=5){
      return Colors.blue[400];
    }else if(note>5 && note<=6){
      return Colors.blue;
    }else if(note>6 && note<=7){
      return Colors.blue[600];
    }else if(note>7 && note<=8){
      return Colors.blue[700];
    }else if(note>8 && note<=9){
      return Colors.blue[800];
    }else if(note>9 && note<=10){
      return Colors.blue[900];
    }
  }

  AnimatedBuilder getContainer() {
    return new AnimatedBuilder(
        animation: _resizableController,
        builder: (context, child) {
          return Container(
            //color: colorVariation((_resizableController.value *100).round()),
            padding: EdgeInsets.all(24),
            child: Text("SAMPLE"),
            decoration: BoxDecoration(
              shape: BoxShape.rectangle,
              borderRadius: BorderRadius.all(Radius.circular(12)),
              border: Border.all(
                  color: colorVariation((_resizableController.value *10).round()), width:10),
            ),
          );
        });
  }

  @override
  void initState() {
    _resizableController = new AnimationController(
      vsync: this,
      duration: new Duration(
        milliseconds: 500,
      ),
    );
    _resizableController.addStatusListener((animationStatus) {
      switch (animationStatus) {
        case AnimationStatus.completed:
          _resizableController.reverse();
          break;
        case AnimationStatus.dismissed:
          _resizableController.forward();
          break;
        case AnimationStatus.forward:
          break;
        case AnimationStatus.reverse:
          break;
      }
    });
    _resizableController.forward();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home:Scaffold(
        backgroundColor: Colors.white,
        body: Center(child: getContainer())));
  }
}

这篇关于如何在颤动中为容器设置动画边框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！