如图所示，上面的红框是一个GridBox，下面是一个带有Splitpane（ListView）和Gridpane（2个按钮）的VBox。我想实现的是隐藏下面的VBox，当按钮“隐藏”时
但是现在，下面的红框被调用root. get儿童（）。删除（孩子）；窗口（阶段）或场景如何自动调整大小。
在控制器中：
public class FunctionOwnerFX extends Application{
public static String HIDE = "Hide Libraries <<<";
public static String SHOW = "Show Libraries >>>";
private boolean isHidden = false;
@FXML
private TextField textfield;
@FXML
private Button btn2;
@FXML
private VBox vbox;
@FXML
private VBox libraryVbox;
private Stage primaryStage;
@Override
public void start(Stage stage) throws Exception{
primaryStage = stage;
Parent root = FXMLLoader.load(getClass().getResource("new_function_owner.fxml"));
Scene scene = new Scene(root);
stage.setTitle("New Function Owner");
stage.setScene(scene);
stage.sizeToScene();
stage.show();
}
@FXML
protected void splitPaneControl(){
isHidden = !isHidden;
if (isHidden) {
vbox.getChildren().remove(libraryVbox);
primaryStage.sizeToScene();
btn2.setText(SHOW);
} else {
vbox.getChildren().add(libraryVbox);
primaryStage.sizeToScene();
btn2.setText(HIDE);
}
}
private ArrayList<String> getMatches(String str){
return null;
}
public static void main(String[] args) {
launch(args);
}
}
当我使用方法sizeToScene（）时发生运行时错误：
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Node.fireEvent(Unknown Source)
at javafx.scene.control.Button.fire(Unknown Source)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Unknown Source)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Scene$MouseHandler.process(Unknown Source)
at javafx.scene.Scene$MouseHandler.access$1500(Unknown Source)
at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.notifyMouse(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
... 49 more
Caused by: java.lang.NullPointerException
at FunctionOwnerFX.splitPaneControl(FunctionOwnerFX.java:65)
... 58 more
我没有足够的声誉来发表评论（需要50个，但我有48个），所以我会做出回答。现在回到主题，在删除节点后尝试在您的阶段对象上调用方法sizeToScene。
https://docs.oracle.com/javase/8/javafx/api/javafx/stage/Window.html#sizeToScene--
考虑到你的方法，我认为Dusko是对的，但我问为什么要重新创建轮子？在这个例子中，我使用TitledPane并随着场景的高度变大或变小而调整阶段。谢谢，@James_D关于如何实现这个的信息。
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.Accordion;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.control.TitledPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
/**
*
* @author blj0011
*/
public class JavaFXApplication97 extends Application
{
@Override
public void start(Stage primaryStage)
{
Label tpLabel = new Label("text here!");
TextField tpTextField = new TextField();
Button tpButton = new Button("OK");
HBox tpHBox = new HBox(tpTextField, tpButton);
VBox topPanel = new VBox(tpLabel, tpHBox);
TextArea bpTextArea = new TextArea();
Button bpButton = new Button("Button");
VBox bpVBox = new VBox(bpTextArea, bpButton);
TextArea bpTextArea2 = new TextArea();
Button bpButton2 = new Button("Button2");
VBox bpVBox2 = new VBox(bpTextArea2, bpButton2);
HBox bpHBox = new HBox(bpVBox, bpVBox2);
TitledPane titledPane = new TitledPane();
titledPane.setText("");
titledPane.setContent(bpHBox);
titledPane.setAnimated(false);
Accordion bottomPanel = new Accordion(titledPane);
VBox root = new VBox(topPanel, bottomPanel);
//This adjust the Stage when the height of the Accordian change.
bottomPanel.expandedPaneProperty().addListener((obs, oldVal, newVal) -> {
System.out.println("hello");
Platform.runLater(() -> {
primaryStage.sizeToScene();
});
});
Scene scene = new Scene(root);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
launch(args);
}
}
