Ich möchte Prüfungen für meine Combobox einzuschränken "Zugriff" auf einige der Werte zu beschränken. Ich könnte einfach diese unerreichbaren Gegenstände aus der Liste entfernen, ja, aber ich möchte, dass der Benutzer die anderen Optionen sieht, auch wenn er sie (noch) nicht auswählen kann.JavaFX ComboBox Änderung Wert verursacht IndexOutOfBoundsException
Problem: Auswählen eines anderen Werts in einem ChangeListener verursacht eine IndexOutOfBoundsException, und ich habe keine Ahnung warum.
Hier ist ein SSCCE. Es erstellt ein Kombinationsfeld mit Integer-Werten, und das erste wird standardmäßig ausgewählt. Dann habe ich versucht, es sehr einfach zu halten: Jede Änderung des Wertes wird als "falsch" betrachtet und ich wechsle die Auswahl zurück zum ersten Element. Aber noch, IndexOutOfBounds:
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.stage.Stage;
public class Tester extends Application{
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage stage) throws Exception {
ComboBox<Integer> box = new ComboBox<Integer>();
ObservableList<Integer> vals= FXCollections.observableArrayList(0,1,2,3);
box.setItems(vals);
box.getSelectionModel().select(0);
/*box.valueProperty().addListener((observable, oldValue, newValue) -> {
box.getSelectionModel().select(0);
});*/
/*box.getSelectionModel().selectedItemProperty().addListener((observable,oldValue,newValue)->{
System.out.println(oldValue+","+newValue);
box.getSelectionModel().select(0);
});*/
box.getSelectionModel().selectedIndexProperty().addListener((observable,oldValue,newValue)->{
System.out.println(oldValue+","+newValue);
box.getSelectionModel().select(0);
});
Scene scene = new Scene(new Group(box),500,500);
stage.setScene(scene);
stage.show();
}
}
Getestet habe ich es mit Valueproperty, selectedItemProperty und selectedIndexProperty, sowie alle davon:
box.getSelectionModel().select(0);
box.getSelectionModel().selectFirst();
box.getSelectionModel().selectPrevious();
box.setValue(0);
if (oldValue.intValue() < newValue.intValue())
box.getSelectionModel().select(oldValue.intValue());
Der einzige denken, dass der Wert arbeitet setzt sich:
Hierbox.getSelectionModel().select(box.getSelectionModel().getSelectedIndex());
box.setValue(box.getValue));
ist die Ausnahme:
Exception in thread "JavaFX Application Thread" java.lang.IndexOutOfBoundsException
at com.sun.javafx.scene.control.ReadOnlyUnbackedObservableList.subList(Unknown Source)
at javafx.collections.ListChangeListener$Change.getAddedSubList(Unknown Source)
at com.sun.javafx.scene.control.behavior.ListViewBehavior.lambda$new$178(Unknown Source)
at com.sun.javafx.scene.control.behavior.ListViewBehavior$$Lambda$126/644961012.onChanged(Unknown Source)
at javafx.collections.WeakListChangeListener.onChanged(Unknown Source)
at com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(Unknown Source)
at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(Unknown Source)
at com.sun.javafx.scene.control.ReadOnlyUnbackedObservableList.callObservers(Unknown Source)
at javafx.scene.control.MultipleSelectionModelBase.clearAndSelect(Unknown Source)
at javafx.scene.control.ListView$ListViewBitSetSelectionModel.clearAndSelect(Unknown Source)
at com.sun.javafx.scene.control.behavior.CellBehaviorBase.simpleSelect(Unknown Source)
at com.sun.javafx.scene.control.behavior.CellBehaviorBase.doSelect(Unknown Source)
at com.sun.javafx.scene.control.behavior.CellBehaviorBase.mousePressed(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.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$350(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$172/2037973250.get(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
at com.sun.glass.ui.View.notifyMouse(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/2117255219.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Was mache ich falsch?
Siehe http://stackoverflow.com/questions/13587134/how-to-disable-some-items-of-javafx-combobox –