2023-03-27 flutter HitTestBehavi

flutter 点击行为识别， 有一个HitTestBehavior属性。它有三个枚举值。他们什么区别？

enum HitTestBehavior {
  /// Targets that defer to their children receive events within their bounds
  /// only if one of their children is hit by the hit test.
  deferToChild,

  /// Opaque targets can be hit by hit tests, causing them to both receive
  /// events within their bounds and prevent targets visually behind them from
  /// also receiving events.
  opaque,

  /// Translucent targets both receive events within their bounds and permit
  /// targets visually behind them to also receive events.
  translucent,
}

这是有关用户界面中目标的三种不同的点击测试行为类型：

"deferToChild" 表示目标本身不会接收到点击测试事件，但是如果它的子元素被点击测试命中，子元素会接收到事件。换句话说，目标将点击测试委托给它的子元素。

"opaque" 表示目标被点击测试命中后会接收到事件，并且它也会阻止它后面的目标接收事件。

"translucent" 表示目标被点击测试命中后会接收到事件，但它也会允许后面的目标接收事件。

这些行为可以用于创建不同类型的用户界面。例如，一个 "opaque" 目标可以用于按钮，它应该阻止后面的任何按钮被点击，而 "translucent" 目标可能用于覆盖层，它应该允许用户与其后面的元素进行交互。