Question

除了一件事之外，我在大多数情况下都能正确显示GUI。 TitledBorder（＆＃34;数字类型＆＃34;）不显示正确JPanel的整个标题。我相信它与BorderLayout Manager有关。而不是显示＆＃34;数字类型＆＃34;在边境内，只是＆＃34;数字......＆＃34;显示器。任何帮助将不胜感激。

public class P3GUI extends JFrame {

    private JLabel originalList;
    private JTextField originalSort;
    private JLabel sortedList;
    private JTextField newSort;
    private JPanel panel;
    private JButton performSort;
    private JRadioButton ascending;
    private JRadioButton descending;
    private ButtonGroup sort;
    private JRadioButton integer;
    private JRadioButton fraction;
    private ButtonGroup numType;
    private JPanel inputPanel, outputPanel, calculatePanel, radioPanel;
    private JPanel left, right;

    public P3GUI () {
        super("Binary Search Tree Sort");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        originalList = new JLabel("Original List");
        originalSort = new JTextField(20);        
        inputPanel = new JPanel();
        inputPanel.add(originalList);
        inputPanel.add(originalSort);
        sortedList = new JLabel("Sorted List");
        newSort = new JTextField(20);
        newSort.setEditable(false);
        outputPanel = new JPanel();
        outputPanel.add(sortedList);
        outputPanel.add(newSort);
        panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        panel.add(inputPanel);
        panel.add(outputPanel);
        add(panel, BorderLayout.NORTH);
        performSort = new JButton("Perform Sort");
        calculatePanel = new JPanel();
        calculatePanel.add(performSort);
        add(calculatePanel, BorderLayout.CENTER);        
        ascending = new JRadioButton("Ascending");
        descending = new JRadioButton("Descending");
        sort = new ButtonGroup();
        sort.add(ascending);
        sort.add(descending);
        integer = new JRadioButton("Integer");
        fraction = new JRadioButton("Fraction");
        numType = new ButtonGroup();
        numType.add(integer);
        numType.add(fraction);
        radioPanel = new JPanel();
        radioPanel.setLayout(new FlowLayout());
        left = new JPanel();
        left.setLayout(new GridLayout(2,1));
        left.setBorder(BorderFactory.createTitledBorder("Sort Order"));
        left.add(ascending);
        left.add(descending);
        right = new JPanel();
        right.setLayout(new GridLayout(2,1));
        right.setBorder(BorderFactory.createTitledBorder("Numeric Type"));
        right.add(integer);
        right.add(fraction);
        radioPanel.add(left);
        radioPanel.add(right);
        add(radioPanel, BorderLayout.SOUTH);        
        pack();

    }
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                new P3GUI().setVisible(true);
            }
        });
    }

}

Answer 1

问题是右JPanel太小而无法显示整个标题，因此会被截断。我建议将底部的两个JPanel放到另一个使用GridLayout的JPanels中，然后放置它们以便它们扩展到适合GUI的底部。当展开时，标题有更大的机会被完全展示（但不是保证，请注意！）。

例如，如果您使主GUI使用BorderLayout，并使用GridLayout将此JPanel添加到BorderLayout.CENTER位置，则会完全填充它。然后，可以将顶部组件TextField和JButton添加到另一个JPanel，例如使用GridBagLayout的组件，并将其添加到主JPanel } BorderLayout.PAGE_START位置。

例如，以下代码生成此GUI：

import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.KeyEvent;
import javax.swing.*;

@SuppressWarnings("serial")
public class P3GUI2 extends JPanel {
    private static final int COLS = 20;
    private JTextField originalSort = new JTextField(COLS);
    private JTextField newSort = new JTextField(COLS);
    private JButton performSort = new JButton("Perform Sort");
    private JRadioButton ascending = new JRadioButton("Ascending");
    private JRadioButton descending = new JRadioButton("Descending");
    private ButtonGroup sort = new ButtonGroup();
    private JRadioButton integer = new JRadioButton("Integer");
    private JRadioButton fraction = new JRadioButton("Fraction");
    private ButtonGroup numType = new ButtonGroup();

    public P3GUI2() {
        JPanel topPanel = new JPanel(new GridBagLayout());
        topPanel.add(new JLabel("Original List:"), createGbc(0, 0));
        topPanel.add(originalSort, createGbc(1, 0));
        topPanel.add(new JLabel("Sorted List:"), createGbc(0, 1));
        topPanel.add(newSort, createGbc(1, 1));

        performSort.setMnemonic(KeyEvent.VK_P);
        JPanel btnPanel = new JPanel();
        btnPanel.add(performSort);

        JPanel sortOrderPanel = createTitlePanel("Sort Order");
        JPanel numericPanel = createTitlePanel("Numeric Type");

        sortOrderPanel.add(ascending);
        sortOrderPanel.add(descending);
        sort.add(ascending);
        sort.add(descending);

        numericPanel.add(integer);
        numericPanel.add(fraction);
        numType.add(integer);
        numType.add(fraction);

        JPanel radioPanels = new JPanel(new GridLayout(1, 0, 3, 3));
        radioPanels.add(sortOrderPanel);
        radioPanels.add(numericPanel);        

        setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
        setLayout(new BorderLayout(3, 3));
        add(topPanel, BorderLayout.PAGE_START);
        add(btnPanel, BorderLayout.CENTER);
        add(radioPanels, BorderLayout.PAGE_END);
    }

    private JPanel createTitlePanel(String title) {
        JPanel panel = new JPanel(new GridLayout(0, 1, 3, 3));
        panel.setBorder(BorderFactory.createTitledBorder(title));
        return panel;
    }

    private GridBagConstraints createGbc(int x, int y) {
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = x;
        gbc.gridy = y;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = x == 0 ? GridBagConstraints.WEST : GridBagConstraints.EAST;
        gbc.insets = new Insets(3, 3, 3, 3);
        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        return gbc;
    }

    private static void createAndShowGui() {
        P3GUI2 mainPanel = new P3GUI2();

        JFrame frame = new JFrame("Binary Search Tree Sort");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(mainPanel);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createAndShowGui());
    }
}

或者您可以将上面的btnPanel放入主要BorderLayout.CENTER中，然后将radioPanel放入主要的BorderLayout.PAGE_END中。这将显示相同外观的GUI，但如果重新调整大小，它将以不同方式展开。

Answer 2

面板的首选大小（由布局管理器确定）不考虑TitledBorder中文本的大小，因此标题可能会被截断。

这是一个可以与TitleBorder一起使用的自定义JPanel。已定制getPreferredSize()方法以使用最大宽度：

默认的getPreferredSize（）计算
TitledBorder中文本的宽度

这是一个简单的例子：

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

public class TitledBorderPanel extends JPanel
{
    /**
     ** The preferred width on the panel must consider the width of the text
     ** used on the TitledBorder
     */
    @Override
    public Dimension getPreferredSize()
    {
        Dimension preferredSize = super.getPreferredSize();

        Border border = getBorder();
        int borderWidth = 0;

        if (border instanceof TitledBorder)
        {
            Insets insets = getInsets();
            TitledBorder titledBorder = (TitledBorder)border;
            borderWidth = titledBorder.getMinimumSize(this).width + insets.left + insets.right;
        }

        int preferredWidth = Math.max(preferredSize.width, borderWidth);

        return new Dimension(preferredWidth, preferredSize.height);
    }

    private static void createAndShowGUI()
    {
        JPanel panel = new TitledBorderPanel();
        panel.setBorder( BorderFactory.createTitledBorder("File Options Command List:") );
        panel.setLayout( new BoxLayout(panel, BoxLayout.Y_AXIS) );
        panel.add( new JLabel("Open") );
        panel.add( new JLabel("Close") );
//      panel.add( new JLabel("A really wierd file option longer than border title") );

        JFrame frame = new JFrame("TitledBorderPanel");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( panel );
        frame.setLocationByPlatform( true );
        frame.pack();
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
*/
    }
}

如何让TitledBorder的标题在GUI中正确显示

2 个答案: