java - VBox 内容未填充窗口

Question

对于我正在开发的程序，我决定创建自己的“命令提示符”，这意味着通常发送到控制台的错误消息将发送到它进行调试。以前，当唯一的功能是显示文本时，一切都工作正常。然而现在，当我将根设为 VBox 而不是 ScrollPane 后，格式和布局就变得很奇怪。以下是控制台的当前版本(无法正常工作)和之前的版本(工作正常)。

旧:

import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.scene.text.FontWeight;
import javafx.stage.Screen;
import javafx.stage.Stage;

public class DebugConsoleOld extends Application {

    private Stage stage;
    private SimpleDateFormat dateFormat;

    public void start(final Stage stage) {
        this.stage = stage;

        ScrollPane scrollPane = new ScrollPane();
        VBox box = new VBox();
        Scene scene = new Scene(scrollPane, Screen.getPrimary()
                .getVisualBounds().getWidth() - 10, Screen.getPrimary()
                .getVisualBounds().getHeight() - 10);

        scrollPane.setStyle("-fx-background-color: black;");
        box.setStyle("-fx-background-color: black;");
        box.setAlignment(Pos.BOTTOM_LEFT);

        scrollPane.setContent(box);

        scrollPane.setFitToHeight(true);
        scrollPane.setFitToWidth(true);

        stage.setScene(scene);
        stage.setTitle("Debug Console");
        stage.show();

        dateFormat = new SimpleDateFormat("[yyyy-M-d HH:mm:ss] ");

        write(new Exception(), Priority.MEDIUM);
        write(new NullPointerException(), Priority.MEDIUM);
        write(new SQLException(), Priority.MEDIUM);
    }

    public void write(String message) {
        message = dateFormat.format(Calendar.getInstance().getTime()) + message;
        ((VBox) ((ScrollPane) stage.getScene().getRoot()).getContent())
            .getChildren().add(textBuilder(message));
    }

    public void write(String message, Priority priority) {
        write(message, priority.color);
    }

    private void write(String message, Color fontColor) {
        message = dateFormat.format(Calendar.getInstance().getTime()) + message;
        ((VBox) ((ScrollPane) stage.getScene().getRoot()).getContent())
            .getChildren().add(
                    textBuilder(message, null, null, 0, fontColor));
    }

    public void write(Exception exception, Priority priority) {
        // exception.printStackTrace();
        write("--- Beginning of Exception ---", Priority.HIGH);
        write(exception.toString(), priority);
        StackTraceElement[] arrayOfStackTraceElement = exception
                .getStackTrace();
        Object localObject2;
        for (StackTraceElement ste : arrayOfStackTraceElement)
            write("\t at " + ste, priority);
        localObject2 = exception.getCause();
        if (localObject2 != null)
            write("Caused by: " + localObject2);
        write("--- End of Exception ---", Priority.HIGH);
    }

    private HBox textBuilder(String text) {
        return textBuilder(text, null, null, 0, null);
    }

    @SuppressWarnings("deprecation")
    private HBox textBuilder(String text, FontWeight fontWeight,
            FontPosture fontPosture, double fontSize, Color fontColor) {
        return javafx.scene.layout.HBoxBuilder
                .create()
                .children(javafx.scene.control.CheckBoxBuilder.create().build(),
                    javafx.scene.text.TextBuilder
                            .create()
                            .text(text)
                            .font(Font
                                    .font("Consolas",
                                            (fontWeight == null ? FontWeight.NORMAL
                                                    : fontWeight),
                                                (fontPosture == null ? FontPosture.REGULAR
                                                        : fontPosture),
                                                (fontSize <= 0 ? 13 : fontSize)))
                                .wrappingWidth(
                                        ((ScrollPane) stage.getScene()
                                                .getRoot()).getWidth() - 2)
                                .fill((fontColor == null ? Color.WHITE
                                        : fontColor)).build()).build();
     }

    public int clear() {
        int items = ((VBox) ((ScrollPane) ((VBox) stage.getScene().getRoot())
                .getChildren().get(0)).getContent()).getChildren().size();
        ((VBox) ((ScrollPane) ((VBox) stage.getScene().getRoot()).getChildren()
                .get(0)).getContent()).getChildren().clear();
        return items;
    }

    public static enum Priority {
         /**
         * A message of no great importance
          */
         LOW(Color.LIGHTGRAY),
        /**
         * A message of standard importance, or something not necessary to be
         * noticed
         */
        NORMAL(Color.WHITE),
        /**
         * A message of standard importance, but may need developer attention
         */
        MILD(Color.YELLOW),
        /**
         * A message needing attention, as something may have broken
         */
        MEDIUM(Color.ORANGE),
        /**
         * A message of great importance, something broke, an exception was
         * thrown, ect.
         */
        HIGH(Color.RED);

        private Color color;

        private Priority(Color color) {
            this.color = color;
        }

    }

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

}

当前:

import java.text.SimpleDateFormat;
import java.util.Calendar;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.TextField;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.scene.text.FontWeight;
import javafx.stage.Stage;

public class DebugConsoleNew extends Application {

    private Stage stage;
    private SimpleDateFormat dateFormat;

    public void start(final Stage stage) {
        this.stage = stage;

        ScrollPane scrollPane = new ScrollPane();
        VBox pane = new VBox();
        VBox box = new VBox();
        Scene scene = new Scene(pane, 500, 300);
        final TextField commandField = new TextField();

        scrollPane.setStyle("-fx-background-color: black;");
        box.setStyle("-fx-background-color: black;");
        box.setAlignment(Pos.BOTTOM_LEFT);

        scrollPane.setContent(box);
        commandField.setBackground(new Background(new BackgroundFill(
                Color.BLACK, null, null)));
        commandField.setStyle("-fx-text-fill: white;");

        pane.getChildren().addAll(scrollPane, commandField);

        scrollPane.setFitToHeight(true);
        scrollPane.setFitToWidth(true);

        stage.setScene(scene);
        stage.setTitle("Debug Console");
        stage.show();

        dateFormat = new SimpleDateFormat("[yyyy-M-d HH:mm:ss] ");
        commandField.requestFocus();
    }

    public void write(String message) {
        message = dateFormat.format(Calendar.getInstance().getTime()) + message;
        ((VBox) ((ScrollPane) ((VBox) stage.getScene().getRoot()).getChildren()
            .get(0)).getContent()).getChildren().add(textBuilder(message));
    }

    public void write(String message, Priority priority) {
        write(message, priority.color);
    }

    private void write(String message, Color fontColor) {
        message = dateFormat.format(Calendar.getInstance().getTime()) + message;
        ((VBox) ((ScrollPane) ((VBox) stage.getScene().getRoot()).getChildren()
            .get(0)).getContent()).getChildren().add(
            textBuilder(message, null, null, 0, fontColor));
    }

    public void write(Exception exception, Priority priority) {
        // exception.printStackTrace();
        write("--- Beginning of Exception ---", Priority.HIGH);
        write(exception.toString(), priority);
        StackTraceElement[] arrayOfStackTraceElement = exception
                .getStackTrace();
        Object localObject2;
        for (StackTraceElement ste : arrayOfStackTraceElement)
            write("\t at " + ste, priority);
        localObject2 = exception.getCause();
        if (localObject2 != null)
            write("Caused by: " + localObject2);
        write("--- End of Exception ---", Priority.HIGH);
    }

    private HBox textBuilder(String text) {
        return textBuilder(text, null, null, 0, null);
    }

    @SuppressWarnings("deprecation")
    private HBox textBuilder(String text, FontWeight fontWeight,
            FontPosture fontPosture, double fontSize, Color fontColor) {
        return javafx.scene.layout.HBoxBuilder
                .create()
                .children(
                        javafx.scene.control.CheckBoxBuilder.create().build(),
                        javafx.scene.text.TextBuilder
                                .create()
                                .text(text)
                                .font(Font
                                        .font("Consolas",
                                                (fontWeight == null ? FontWeight.NORMAL
                                                        : fontWeight),
                                                (fontPosture == null ? FontPosture.REGULAR
                                                        : fontPosture),
                                                (fontSize <= 0 ? 13 : fontSize)))    
                                .wrappingWidth(
                                        ((VBox) stage.getScene().getRoot())
                                                .getWidth() - 2)
                                .fill((fontColor == null ? Color.WHITE
                                        : fontColor)).build()).build();
    }

    public int clear() {
        int items = ((VBox) ((ScrollPane) ((VBox) stage.getScene().getRoot())
                .getChildren().get(0)).getContent()).getChildren().size();
    ((VBox) ((ScrollPane) ((VBox) stage.getScene().getRoot()).getChildren()
                .get(0)).getContent()).getChildren().clear();
        return items;
    }

    public static enum Priority {
        /**
         * A message of no great importance
         */
        LOW(Color.LIGHTGRAY),
        /**
         * A message of standard importance, or something not necessary to be
         * noticed
         */
        NORMAL(Color.WHITE),
        /**
         * A message of standard importance, but may need developer attention
         */
        MILD(Color.YELLOW),
        /**
         * A message needing attention, as something may have broken
         */
        MEDIUM(Color.ORANGE),
        /**
         * A message of great importance, something broke, an exception was
         * thrown, ect.
         */
        HIGH(Color.RED);

        private Color color;

        private Priority(Color color) {
            this.color = color;
        }

    }

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

}

上述代码可以复制到IDE中并执行。有谁知道为什么格式变得很奇怪吗？

Answer 1

由于所有奇怪的强制转换等，很难理解您的代码想要做什么。不同时调用 setFitToWidth(true)和 setFitToHeight(true)在 ScrollPane 上使 ScrollPane 变得多余？

如果目的是让 ScrollPane 使用 VBox 可用的任何额外空间，您可以调用

VBox.setVgrow(scrollPane, javafx.scene.layout.Priority.ALWAYS);