Javafx use_computed_size für die Bühne ohne Verwendung von FXML ⇐ Java

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Im JavaFX -Szenenbauer kann ich einen Wert für die minimale, maximale und bevorzugte Breite und Höhe eines Steuerung oder Container auswählen. Es gibt vordefinierte Werte wie Use_Computed_size < /code>. Jetzt frage ich mich, wie ich diese Werte festlegen kann, wenn ich FXML nicht verwendete. < /p>

Wie mache ich das? Ich habe den folgenden Code ausprobiert: < /p>

Code: Select all

initializeControls();
addControls();

setMinHeight(Control.USE_COMPUTED_SIZE);
setMinWidth(Control.USE_COMPUTED_SIZE);

addActionListeners();
addFocusChangeListeners();
< /code>

Dies führt jedoch zu einer Ausnahme, wenn Sie versuchen, die Stufe zu erstellen: < /p>

Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: The width and height must be >= 0.  Got: width=-1;  height=-1
at com.sun.glass.ui.Window.setMinimumSize(Window.java:984)
at com.sun.javafx.tk.quantum.WindowStage.setMinimumSize(WindowStage.java:291)
at javafx.stage.Stage.impl_visibleChanging(Stage.java:1154)
at javafx.stage.Window$9.invalidated(Window.java:743)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:143)
at javafx.stage.Window.setShowing(Window.java:841)
at javafx.stage.Window.show(Window.java:856)
at javafx.stage.Stage.show(Stage.java:255)
at dictionary.MainApp.trainVocablesButtonActionPerformed(MainApp.java:281)
at dictionary.MainApp.lambda$addActionListeners$2(MainApp.java:240)
at dictionary.MainApp$$Lambda$281/81350454.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8216)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3724)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3452)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1728)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2461)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:348)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:273)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:382)
at com.sun.glass.ui.View.handleMouseEvent(View.java:553)
at com.sun.glass.ui.View.notifyMouse(View.java:925)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$45(GtkApplication.java:126)
at com.sun.glass.ui.gtk.GtkApplication$$Lambda$42/379110473.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
< /code>

Ich denke, ich habe den Wert von Use_Computed_Size < /code> aus der falschen Klasse oder so übernommen,  aber woher bekomme ich den richtigen Wert? Oder ist dieser ganze Ansatz irgendwie falsch? Mehr. < /p>

Bearbeiten#1:
Korrektur: Es sollte so viel Platz wie erforderlich wie eine  minimale < /em> Breite und Höhe benötigen, also also Dass das Fenster immer noch setzbar ist, aber nicht so klein gemacht werden kann, dass Steuerelemente nicht mehr angezeigt werden. Breite + Höhe auf einem kleineren Beispiel App:
 

Code: < /p>

package javafxapplication3;

import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Control;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.scene.paint.RadialGradientBuilder;
import javafx.scene.paint.Stop;
import javafx.stage.Stage;

public class GridPaneExample extends Application {
private final Paint background = RadialGradientBuilder.create()
.stops(new Stop(0d, Color.TURQUOISE), new Stop(1, Color.web("3A5998")))
.centerX(0.5d).centerY(0.5d).build();
@Override
public void start(Stage primaryStage) {
GridPane root = new GridPane();
root.setPadding(new Insets(5));
root.setHgap(2);
root.setVgap(2);
root.setAlignment(Pos.CENTER);
final TextField tex = new TextField();
tex.setPrefWidth(250);
tex.setPrefHeight(50);
tex.setPromptText("Press the buttons to Display text here");
tex.setFocusTraversable(false);
GridPane.setColumnSpan(tex, 7);
GridPane.setRowSpan(tex, 2);
root.add(tex, 0, 0);
GridPane.setHalignment(tex, HPos.CENTER);
final Button[][] btn = new Button[5][5];
char ch = 'A';
for ( int i = 0; i < btn.length; i++) {
for ( int j = 0; j < btn.length; j++) {

btn[i][j] = new Button("" + ch);
btn[i][j].setPrefSize(50, 50);
root.add(btn[i][j], j, i+2);
ch++;
btn[i][j].setOnMouseClicked((mouseEvent) -> {
Button b = (Button) mouseEvent.getSource();
tex.appendText(b.getText());
});
}
}

Scene scene = new Scene(root,background);

primaryStage.setTitle("Grid Pane Example");

primaryStage.setScene(scene);

primaryStage.setWidth(Control.USE_COMPUTED_SIZE);
primaryStage.setHeight(Control.USE_COMPUTED_SIZE);

primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}