Scala-Swing当对话框访问父内容时，父内容被清除

Question

我正在开发一个使用Scala-swing前端的应用程序。我有一个填充的MainFrame，并且工作正常。我也有一个运行良好的对话框。但是当我从对话框访问父框架时，框架的内容就清晰了。MemuBar仍然在那里。

我只需要将对话框放在框架的中心，所以我只是传递了一个Point (在尝试做正确的事情之后)，即使这样也会导致问题。我可以设置一个在对话框中创建的定位点，但我无法访问框架来执行此操作。我真的不明白这一点；我在帧中创建点并将其发送到对话框，这很好，但将对话框位置设置为它会清除帧。

我正在使用"org.scala-lang.modules“% "scala-swing_2.11”% "1.0.2“

有谁有什么想法吗？

谢谢!

另一方面，这个演示代码运行得很好，所以它不是那么简单

package hack

import scala.swing.{Action, BorderPanel, Button, Dialog, Dimension, FlowPanel, Frame, MainFrame, Menu, MenuBar, MenuItem, SimpleSwingApplication, TabbedPane}

/**
  * Created by bday on 3/31/16.<br>
  * <br>
  * FrameClearingDialog will do something useful I'm sure
  */
class FrameClearingDialog (parent: Frame) {
  val dialog = new Dialog
  dialog.contents = new FlowPanel() {
    preferredSize = new Dimension(500,500)
  }
  dialog.open()
  dialog.setLocationRelativeTo(parent)
}

class Parent extends SimpleSwingApplication {
  override def top: Frame = new MainFrame {
    title = "Hack "
    preferredSize = new Dimension(1000,1000)
    menuBar = new MenuBar() {
      contents += new Menu("Menu") {
        contents += new MenuItem(Action("Show Dialog") {
          createAndShowDialog
        })
      }
    }
    val panel = new BorderPanel() {
      layout(new Button() {text="button"}) = BorderPanel.Position.North
      layout(new Button() {text="button"}) = BorderPanel.Position.Center
      layout(new Button() {text="button"}) = BorderPanel.Position.South
    }
    contents = new TabbedPane() {
        pages += new TabbedPane.Page("Page", panel)
    }
  }

  def createAndShowDialog = {
    new FrameClearingDialog(top)
  }
}

object Starter extends App {
  val demo = new Parent
  demo.main(args)
}

Answer 1

这不是答案，但它确实解释了这个问题，足以理解和避免它。

问题似乎出在范围上。如果内容是在MainFrame构造函数内创建的，它会在子级的调用中存活下来，如果是在外部创建的，则不会。Swing有时会做一些奇怪的事情，我现在不打算在这方面花费更多的时间。

如果将"map“的创建移到MainFrame中，则此示例将正常工作。

package hack

import scala.swing.{Action, BorderPanel, BoxPanel, Button, Dialog, Dimension, FlowPanel, Frame, MainFrame, Menu, MenuBar, MenuItem, Orientation, Panel, Point, RichWindow, SimpleSwingApplication, TabbedPane}

/**
  * Created by bday on 3/31/16.<br>
  * <br>
  * Utils will do something useful I'm sure
  */
object Utils {

  def findCenter(window: RichWindow) = {
    new Point(window.location.x + window.size.width/2, window.location.y + window.size.height/2)
  }

  def centerMe(parent: RichWindow, child: RichWindow) = {
    val parentCenter = findCenter(parent)
    val childCenter = findCenter(child)
    new Point(parentCenter.x - childCenter.x, parentCenter.y - childCenter.y)
  }
}

/**
  * Created by bday on 3/31/16.<br>
  * <br>
  * FrameClearingDialog will do something useful I'm sure
  */
class FrameClearingDialog (parent: Frame) {
  val dialog = new Dialog
  dialog.contents = new FlowPanel() {
    preferredSize = new Dimension(500, 500)
  }
  dialog.location = Utils.centerMe(parent, dialog)
  dialog.open()
}

class Parent extends SimpleSwingApplication {

    val map = {
      var map = Map.empty[Int, Panel]
      for (x <- 1 to 5) {
        map += x -> createPanel(x)
      }
      map
    }

  override def top: Frame = new MainFrame {
    title = "Hack "
    preferredSize = new Dimension(1000,1000)
    menuBar = new MenuBar() {
      contents += new Menu("Menu") {
        contents += new MenuItem(Action("Show Dialog") {
          createAndShowDialog
        })
      }
    }
    contents = new TabbedPane() {
      for (x <- 1 to 5) {
        pages += new TabbedPane.Page(s"Page $x", map(x))
      }
    }
  }

  def createPanel(x: Int) = {
    new BoxPanel(Orientation.Vertical) {
      contents += new Button() {text=s"button $x"}
    }
  }

  def createAndShowDialog = {
    new FrameClearingDialog(top)
  }
}

object Starter extends App {
  val demo = new Parent
  demo.main(args)
}