java-无法在新场景内移动TextFlow

在我的ScalaFX项目中,我想为用户创建一个单独的帮助页面,在该页面中,他/她可以单击一个主题,从而导致在可单击主题旁边显示说明.

问题是,当我为帮助页面创建新场景时,无论做什么,我都无法移动TextFlow.它位于ListView顶部的同一位置.请参阅图片以供参考.

 helpMenu.onAction = (ae: ActionEvent) => {
    val helpStage = new Stage()
    helpStage.setTitle("A wild help stage appears!")
    val helpScene = new Scene(scene.width.get * 0.6, scene.height.get * 0.8) {
      val listView        = new ListView(List.tabulate(3) { n => "Option " + (n + 1) })
      val text1           = new Text("This is fine\n*zips coffee*\nThis is all fine.")
      val textFlow        = new TextFlow(text1)
      /*
       * Nothing below changes where the text appears in the new scene.
       */
      textFlow.layoutX  <== listView.width.get
      textFlow.alignmentInParent_=(Pos.TOP_RIGHT)
      textFlow.alignmentInParent_=(Pos.BASELINE_CENTER)
      text1.alignmentInParent_=(Pos.BASELINE_CENTER)

      listView.prefHeight <== scene.height.get * 0.4
      content.addAll(listView, textFlow)

    }
    helpStage.setScene(helpScene)
    helpStage.show()
    helpScene.listView.onMouseClicked = (le: MouseEvent) => {
      val item = helpScene.listView.selectionModel.apply.getSelectedItem
    }
  }

我想知道的是如何定位列表视图旁边的文本?目的是使说明出现在此处.我的计划是使用

helpScene.listView.onMouseClicked =(le:MouseEvent)=> {
      val item = helpScene.listView.selectionModel.apply.getSelectedItem
    }

为此,因为我们可以轻松确定列表中单击的内容.

java-无法在新场景内移动TextFlow

解决方法:

我认为这里的问题是您需要将ListView和TextFlow元素添加到一个容器中,以控制它们的布局方式.在下面的代码中,我为此目的使用了HBox,它将两个并排放置. (对于较旧的JavaFX 2版本,scalafx.scene.layout包中还有其他选项,例如VBox,BorderPane等.This tutorial,可能有助于您更好地理解该主题.)

之后,我不清楚您要实现的目标,但是我认为您要尝试的是根据选择ListView中的哪个项目在TextFlow中显示不同的文本.如果真是这样,那么以下示例通过使用选择更改来触发TextFlow内容更改来解决此问题. (如果您不是这样想的,您可以详细说明您的要求吗?)

另外,我还简化了一些代码以使用ScalaFX的属性(与JavaFX的getter和setter相对).

onAction = (ae: ActionEvent) =>  {
  val helpStage = new Stage() {

    // Make room for the list view and the text flow.
    width = 400

    // Set the help text to the default.
    val defaultText = "Please make\na selection"
    val helpText = new Text(defaultText)

    // Help for each option in the list view. If a key doesn't match, then the default
    // text is displayed.
    val optionText = Map(
      "Option 1" -> "This is\nsome help for\nOption 1",
      "Option 2" -> "And this is\nsome help for\nOption 2",
      "Option 3" -> "Finally, this is\nsome help for\nOption 3",
    ).withDefaultValue(defaultText)

    // Title the stage and set the scene...
    title = "A wild help stage appears!"
    scene = new Scene {

      val listView = new ListView(List.tabulate(3) { n => "Option " + (n + 1) }) {

        // Change the help text when the selection changes.
        selectionModel().selectedItem.onChange {(_, _, selected) =>
          helpText.text = optionText(selected);
        }
      }

      // Add the help text to the text flow.
      val textFlow = new TextFlow(helpText)

      // Put list view and text flow elements side-by-side.
      content = new HBox(listView, textFlow)
    }
  }
  helpStage.show()
}
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