如何识别 Scala 中的鼠标点击? [英] How do I recognize mouse clicks in Scala?

问题描述

我正在编写一个小的 GUI 程序.除了我想识别鼠标双击之外，一切正常.但是，我根本无法识别鼠标点击(因此)，尽管我可以点击按钮并从列表中选择代码.

I'm writing a small GUI program. Everything works except that I want to recognize mouse double-clicks. However, I can't recognize mouse clicks (as such) at all, though I can click buttons and select code from a list.

以下代码改编自 Ingo Maier 的The scala.swing 包":

The following code is adapted from Ingo Maier's "The scala.swing package":

import scala.swing._
import scala.swing.event._

object MouseTest extends SimpleGUIApplication {
  def top = new MainFrame {
    listenTo(this.mouse) // value mouse is not a member of scala.swing.MainFrame
    reactions += {
      case e: MouseClicked =>
        println("Mouse clicked at " + e.point)
    }
  }
}

我尝试了多种变体:mouse vs. Mouse、SimpleSwingApplication、从 java.awt.event 导入 MouseEvent 等.错误信息很清楚——在 MainFrame 中没有鼠标值——那么，它在哪里?帮助！

I've tried multiple variations: mouse vs. Mouse, SimpleSwingApplication, importing MouseEvent from java.awt.event, etc. The error message is clear enough--no value mouse in MainFrame--so, where is it then? Help!

推荐答案

也许是这样?

object App extends SimpleSwingApplication {
  lazy val ui = new Panel {
    listenTo(mouse.clicks)
    reactions += {
      case e: MouseClicked =>
        println("Mouse clicked at " + e.point)
    }
  }
  def top = new MainFrame {
    contents = ui
  }
}

顺便说一句，SimpleGUIApplication 已弃用

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