events - Scala Swing 事件框架 - 在哪里添加 react 器？

Question

我试图捕捉鼠标点击，即使是在Table上(这应该会导致显示弹出窗口)。该表位于 ScrollPane 内，而 ScrollPane 又位于 Panel 内。我已经为所有类添加了 react ，但我似乎永远无法真正捕获点击事件!

class MyPanel extends GridBagPanel {
  val gbc = new GridBagContraints( ... )

  add(new ScrollPane {
    reactions += {
      case MouseClicked(src, point, mod, clicks, pops) =>
        println("Scroll pops: " + pops)
    } 

    viewportView = new Table {
      reactions += {
        case MouseClicked(src, point, mod, clicks, pops) =>
          println("Table pops: " + pops)
      } 

      ...
    }

  }, gbc)

  reactions += {
    case MouseClicked(src, point, mod, clicks, pops) =>
      println("Panel pops: " + pops)
  } 
}

无论我点击哪里，都不会打印任何内容。我做错了什么？

Answer 1

好的 - 你必须听正确的事情:

class MyPanel extends GridBagPanel {
  val gbc = new GridBagContraints( ... )

  val table = new Table { ... }

  add(new ScrollPane {

    viewportView = table
  }

  }, gbc)

  listenTo(table.Mouse.clicks) //THIS LINE IS IMPORTANT :-)

  reactions += {
    case MouseClicked(`table`, point, mod, clicks, pops) =>
      println("Panel pops: " + pops)
    } 
  }
}