class GradientButton extends StatelessWidget {
  const GradientButton({
    Key? key,
    this.colors,
    this.width,
    this.height,
    this.borderRadius,
    required this.tapCallback,
    required this.child,
    this.disable = false,
  }) : super(key: key);

  final List<Color>? colors; // 渐变色数组
  final double? width; // 按钮 宽
  final double? height; // 按钮 高
  final BorderRadius? borderRadius; // 按钮 圆角

  final GestureTapCallback tapCallback;
  final bool disable; // 禁用

  final Widget child; // 子组件

  @override
  Widget build(BuildContext context) {
    ThemeData theme = Theme.of(context);

    List<Color> _colors = [];
    if (disable) {
      //确保colors数组不空
      _colors = [Colors.grey.withAlpha(100), Colors.grey.withAlpha(100)];
    } else {
      //确保colors数组不空
      _colors = colors ?? [theme.primaryColor, theme.primaryColorDark];
    }

    return DecoratedBox(
      decoration: BoxDecoration(
        borderRadius: borderRadius,
        gradient: LinearGradient(colors: _colors),
      ),
      child: Material(
        type: MaterialType.transparency, // 透明材质 用于绘制墨水飞溅和高光
        child: InkWell(
          onTap: disable ? null : tapCallback,
          splashColor: _colors.last,
          borderRadius: borderRadius,
          enableFeedback: !disable, // 是否给予操作反馈
          highlightColor: Colors.transparent,
          child: ConstrainedBox(
            constraints: BoxConstraints.tightFor(width: width, height: height),
            child: Center(
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: DefaultTextStyle(
                  style: TextStyle(fontWeight: FontWeight.bold),
                  child: child,
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}

class MSGradientButtonDemo extends StatelessWidget {
  const MSGradientButtonDemo({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("GradientButton")),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          children: [
            GradientButton(
              tapCallback: () => print("Button Clicked 1"),
              child: Text("Submit 1"),
              colors: [Colors.orange, Colors.cyan],
              height: 50,
            ),
            GradientButton(
              tapCallback: () => print("Button Clicked 2"),
              child: Text("Submit 2"),
              colors: [Colors.cyan, Colors.green],
              height: 50,
            ),
            GradientButton(
              tapCallback: () => print("Button Clicked 3"),
              child: Text("Submit 3"),
              colors: [Colors.yellow, Colors.red, Colors.orange],
              height: 50,
            ),
            GradientButton(
              tapCallback: () => print("Button Clicked 4"),
              child: Text("Submit 4"),
              colors: [Colors.orange, Colors.cyan],
              height: 50,
              width: 200,
              borderRadius: BorderRadius.circular(8),
            ),
            GradientButton(
              tapCallback: () => print("Button Clicked 5"),
              child: Text("enable 5"),
              width: 200,
              height: 50,
              borderRadius: BorderRadius.circular(8),
              colors: [Colors.grey, Colors.red],
              disable: false,
            ),
            GradientButton(
              tapCallback: () => print("Button Clicked 6"),
              child: Text("Disable 6"),
              width: 200,
              height: 50,
              borderRadius: BorderRadius.circular(8),
              disable: true,
            )
          ],
        ),
      ),
    );
  }
}