Java Swing:JTextArea填充整个分配的空间_Java_Swing

Java Swing:JTextArea填充整个分配的空间

java swing

Java Swing:JTextArea填充整个分配的空间,java,swing,Java,Swing,我有上面的代码，它模拟了应用于GridBagLayout（）的黄金比例思想。结果如下：现在，您可以看到文本区域是空的。我想它的主机面板基本上是充满了 “白色”空间，即使此时文本区域为空。我记得在SE这里读到，BorderLayout是一条路，所以我试过了。因此，本质上，我希望文本区域填充它的宿主面板到边缘，滚动窗格也可见如何做到这一点？上述MWE最相关的代码可能是MyTextPanel类现在，您可以看到文本区域是空的这是因为您实际上没有将文本区域添加到滚动窗格中 import

我有上面的代码，它模拟了应用于GridBagLayout（）的黄金比例思想。结果如下：现在，您可以看到文本区域是空的。我想它的主机面板基本上是充满了 “白色”空间，即使此时文本区域为空。我记得在SE这里读到，

BorderLayout

是一条路，所以我试过了。因此，本质上，我希望文本区域填充它的宿主面板到边缘，滚动窗格也可见

如何做到这一点？上述MWE最相关的代码可能是MyTextPanel类

现在，您可以看到文本区域是空的

这是因为您实际上没有将文本区域添加到滚动窗格中

import javax.swing.*;
import javax.swing.border.EtchedBorder;
import java.awt.*;

import static java.awt.GridBagConstraints.BOTH;

public class mwe extends JFrame {

    private JPanel x, y, z, u,v,w,jtext;

    private class MyBorderedPanel extends JPanel {
        MyBorderedPanel( String title ) {
            this.setBorder(BorderFactory.createTitledBorder(
                    BorderFactory.createEtchedBorder(EtchedBorder.LOWERED), title
            ));
        }
    }

    private class MyTextPanel extends JPanel {
        JTextArea textArea;
        MyTextPanel( String title ) {
            textArea= new JTextArea();
            this.setBorder(BorderFactory.createTitledBorder(
                            BorderFactory.createEtchedBorder(EtchedBorder.LOWERED),
                            title));
            this.setLayout(new BorderLayout());
            JScrollPane pane= new JScrollPane();
            pane.add(textArea);
            textArea.setLineWrap(true);
            textArea.setWrapStyleWord(true);
            this.add(pane);
        }
    }

    public mwe() {
        x= new MyBorderedPanel("x");
        y= new MyBorderedPanel("y");
        z= new MyBorderedPanel("z");
        u= new MyBorderedPanel("u");
        v= new MyBorderedPanel("v");
        w= new MyBorderedPanel("w");
        jtext= new MyTextPanel("textArea");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        manageLayout();
    }

    private void manageLayout() {
        this.setLayout(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.fill = BOTH;

        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.weightx = constraints.weighty = 13.00;
        constraints.gridwidth = 1;
        constraints.gridheight = 4;
        this.add(x, constraints);

        constraints.gridx = 1;
        constraints.gridy = 0;
        constraints.weightx = constraints.weighty = 8.00;
        constraints.gridwidth = 3;
        constraints.gridheight = 1;
        this.add(y, constraints);


        { //adding dummes: 2x2, 1x1, 1x1
            constraints.gridx = 1;
            constraints.gridy = 1;
            constraints.weightx = constraints.weighty = 2.00;
            constraints.gridwidth = 1;
            constraints.gridheight = 2;
            this.add(u, constraints);

            constraints.gridx = 2;
            constraints.gridy = 1;
            constraints.weightx = constraints.weighty = 1.00;
            constraints.gridwidth = 1;
            constraints.gridheight = 1;
            this.add(v, constraints);

            constraints.gridx = 2;
            constraints.gridy = 2;
            constraints.weightx = constraints.weighty = 1.00;
            constraints.gridwidth = 1;
            constraints.gridheight = 1;
            this.add(v, constraints);
        }

        constraints.gridx = 3;
        constraints.gridy = 1;
        constraints.weightx = constraints.weighty = 5.00;
        constraints.gridwidth = 1;
        constraints.gridheight = 3;
        this.add(jtext, constraints);


        constraints.gridx = 1;
        constraints.gridy = 3;
        constraints.weightx = constraints.weighty = 3.00;
        constraints.gridwidth = 2;
        constraints.gridheight = 1;
        this.add(z, constraints);
    }
    public static void main( String ... args ) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame= null;
                frame = new mwe();
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}

上面的代码是错误的。您不能将组件直接“添加”到JScrollPane

而是将组件添加到

JScrollPane

的

JViewport

这可以通过执行以下任一操作来实现：

JScrollPane pane= new JScrollPane();
pane.add(textArea);

将文本区域添加到视口，或

JScrollPane pane= new JScrollPane(textArea);