Tooltip

const Tooltip({

    super.key,

    this.message,

    this.richMessage,

    this.height,

    this.padding,

    this.margin,

    this.verticalOffset,

    this.preferBelow,

    this.excludeFromSemantics,

    this.decoration,

    this.textStyle,

    this.textAlign,

    this.waitDuration,

    this.showDuration,

    this.triggerMode,

    this.enableFeedback,

    this.onTriggered,

    this.child,

  })

 

注意：是在所child控件上长按才显示message

 

Tooltip(
              message: '点击进行用户名和密码认证，完成系统登录',
              child: ElevatedButton(
                onPressed: () {
                  _login();
                },
                child: const Text('Login'),
              ),
            ),