JavaFx USE_COMPUTED_SIZE 用于舞台而不使用 FXML

Question

在 JavaFX 场景生成器中，我可以选择

Control

或

Container

的最小、最大和首选宽度和高度值。有一些预定义值，例如

USE_COMPUTED_SIZE

。

我得出的结论是，出于多种原因，我不喜欢在当前项目中使用 FXML，现在我想知道在不使用 FXML 时如何设置这些值。

我该怎么做？

我尝试过以下代码：

initializeControls();
addControls();


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

addActionListeners();
addFocusChangeListeners();

但是，在尝试创建舞台时会导致异常：

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)

我猜，我从错误的类或其他东西中获取了

USE_COMPUTED_SIZE

值，但是我从哪里获得正确的值？或者这整个方法在某种程度上是错误的？

我的最终目标是让舞台占据尽可能多的空间来显示其中的所有控件和容器，但不要更多。

编辑#1： 更正：它应该占用与最小宽度和高度一样多的空间，以便窗口仍然可以调整大小，但不能太小以至于不再显示控件。

编辑#2： 尝试在较小的示例应用程序上设置最小宽度+高度的结果：

代码：

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);
    }
}

Answer 1

其中一条评论帮助我找到了解决方案，尽管它可能不是最好的解决方案： 将所有控件添加到场景后，我只需执行以下操作：

setMinWidth(getWidth());
setMinHeight(getHeight());

这是可行的，因为 JavaFX 最初将舞台设置为其场景上的控件所需的大小。

Answer 2

聚会可能迟到了，但这是我发现的：

对于文本字段，有一个静态字段

TextField.USE_COMPUTED_SIZE

，其值为

-1

我想你也可以将

-1

传递到舞台。