Flutter 圆形波纹效果：如何打造漂亮的材质BottomNavigationBar

Question

由于Google stadia 应用程序是用 flutter 制作的，我想知道他们是如何在 BottomNavigationBar 上实现更漂亮的涟漪动画的。

例子：

他们是如何实现自定义涟漪动画的？

编辑：简单的自定义BottomNavigationItem：

bottomNavigationBar: Container(
      height: 50,
      child: Row(
        children: <Widget>[
          Expanded(
            child: BottomItem(),
          ),
          Expanded(
            child: BottomItem(),
          ),
          Expanded(
            child: BottomItem(),
          ),
        ],
      )),

class BottomItem extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap: () {},
      child: Center(child: Icon(Icons.shop)),
    );
  }
}

Answer 1

您正在寻找的Ink是InkResponse而不是InkWell。InkWell 用高光填充整个可用空间，然后进行飞溅，但是，InkResponse如果飞溅具有您正在寻找的圆形效果，您需要稍微调整一下，但这是代码示例：

Material(
  child: Container(
    child: Center(
       child: InkResponse(
            focusColor: Colors.transparent,
            hoverColor: Colors.transparent,
            highlightColor: Colors.transparent,
            onTap: () {},
            child: Padding(
              padding: const EdgeInsets.all(30),
              child: Icon(Icons.home),
            ),
          ),
        ),
      ),
    )

| 墨水井| InkResponse 默认| InkResponse 自定义|

Answer 2

Google Stadia 应用示例： 图 1 图 2

注意：使用 Material Widget 作为行的父级，以便效果可以扩展到所有行宽度，并限制条件为“半径：40”

另外，这个例子只是简单的代码，不会冒犯 SOLID 模式..等

Container(
      width: double.infinity,
      height: 300,
      child: Material(
        color: Colors.transparent,
        child: Row(
          children: [
            Expanded(
              flex: 20,
              child: InkResponse(
                onTap: () {},
                //containedInkWell: false,
                splashFactory: InkRipple.splashFactory,
                radius: 40,
                splashColor: Colors.black12,
                highlightColor: Colors.transparent,
                child: Container(height: double.infinity, alignment: Alignment.center, child: Icon(Icons.search_rounded)),
              ),
            ),
            Expanded(
              flex: 20,
              child: InkResponse(
                onTap: () {},
                //containedInkWell: false,
                splashFactory: InkRipple.splashFactory,
                radius: 40,
                splashColor: Colors.black12,
                highlightColor: Colors.transparent,
                child: Container(height: double.infinity, alignment: Alignment.center, child: Icon(Icons.search_rounded)),
              ),
            ),
            Expanded(
              flex: 20,
              child: InkResponse(
                onTap: () {},
                //containedInkWell: false,
                splashFactory: InkRipple.splashFactory,
                radius: 40,
                splashColor: Colors.black12,
                highlightColor: Colors.transparent,
                child: Container(height: double.infinity, alignment: Alignment.center, child: Icon(Icons.search_rounded)),
              ),
            ),
            Expanded(
              flex: 20,
              child: InkResponse(
                onTap: () {},
                //containedInkWell: false,
                splashFactory: InkRipple.splashFactory,
                radius: 40,
                splashColor: Colors.black12,
                highlightColor: Colors.transparent,
                child: Container(height: double.infinity, alignment: Alignment.center, child: Icon(Icons.search_rounded)),
              ),
            ),
            Expanded(
              flex: 20,
              child: InkResponse(
                onTap: () {},
                //containedInkWell: false,
                splashFactory: InkRipple.splashFactory,
                radius: 40,
                splashColor: Colors.black12,
                highlightColor: Colors.transparent,
                child: Container(height: double.infinity, alignment: Alignment.center, child: Icon(Icons.search_rounded)),
              ),
            ),
          ],
        ),
      ),
    )