4

我有个问题。在 JScrollPane 中，我使用 JPanel 的继承者作为 viewPort。继承者可以包含标签、单选按钮、复选框和其他元素（取决于实现）。在 JScrollPane 中设置 HORIZONTAL_SCROLLBAR_​​NEVER。JPanel 的继承者中的内容需要在纵横滚动中换行。在标签中显示长文本时（特别是 html 标签）没有自动换行，尽管 HORIZONTAL_SCROLLBAR_​​NEVER。如果不使用 JScrollPane（JPanel 的继承者有具体大小）的话要被包裹，但我需要垂直滚动。

尝试设置侦听器以调整 JScrollPane 的大小并为内部 JPanel 设置必要的大小。不工作。设置侦听器以调整内部 JPanel 的大小。设置宽度后发生另一个变化（显然非常重要）。

我怎么解决这个问题？需要在垂直和水平自动换行中滚动。提前致谢。对不起我的英语不好）。

示例（不好，之后更好）

import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.border.EmptyBorder;

public class Test extends JFrame
{

    private JPanel contentPane;

    /**
     * Launch the application.
     */
    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                try
                {
                    Test frame = new Test();


                    JScrollPane scrollPane =  new JScrollPane();
                    scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
                    JPanel panel = new JPanel();
                    panel.add(new JLabel("<html>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</html>"));
                    scrollPane.setViewportView(panel);
                    frame.add(scrollPane);
                    frame.setVisible(true);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public Test()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);
    }

}

好的例子

屏幕链接：http ://s44.radikal.ru/i104/1204/4d/72ea56d685ee.png

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.ScrollPaneConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.JScrollPane;

public class Test extends JFrame
{

private JPanel contentPane;

/**
 * Launch the application.
 */
public static void main(String[] args)
{
    EventQueue.invokeLater(new Runnable()
    {
        public void run()
        {
            try
            {
                Test frame = new Test();
                frame.setVisible(true);

            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public Test()
{
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    GridBagLayout gbl_contentPane = new GridBagLayout();
    gbl_contentPane.columnWidths = new int[] { 0, 0 };
    gbl_contentPane.rowHeights = new int[] { 0, 0 };
    gbl_contentPane.columnWeights = new double[] { 1.0, Double.MIN_VALUE };
    gbl_contentPane.rowWeights = new double[] { 1.0, Double.MIN_VALUE };
    contentPane.setLayout(gbl_contentPane);

    JScrollPane scrollPane = new JScrollPane();
    GridBagConstraints gbc_scrollPane = new GridBagConstraints();
    gbc_scrollPane.fill = GridBagConstraints.BOTH;
    gbc_scrollPane.gridx = 0;
    gbc_scrollPane.gridy = 0;
    contentPane.add(scrollPane, gbc_scrollPane);

    JPanel panel = new JPanel();
    scrollPane.setViewportView(panel);
    scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);        
    GridBagLayout gbl_panel = new GridBagLayout();
    gbl_panel.columnWidths = new int[]{0, 0};
    gbl_panel.rowHeights = new int[]{0, 0};
    gbl_panel.columnWeights = new double[]{0.0, Double.MIN_VALUE};
    gbl_panel.rowWeights = new double[]{0.0, Double.MIN_VALUE};
    panel.setLayout(gbl_panel);

    JLabel lblNewLabel = new JLabel("<html>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</html>");
    GridBagConstraints gbc_lblNewLabel = new GridBagConstraints();
    gbc_lblNewLabel.gridx = 0;
    gbc_lblNewLabel.gridy = 0;
    panel.add(lblNewLabel, gbc_lblNewLabel);
}

 }

JLabel 中带有 `tag html` 的自动换行示例：

屏幕链接：http ://s019.radikal.ru/i628/1204/75/d14b8fa81f15.png

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class Test extends JFrame
{

private JPanel contentPane;

/**
 * Launch the application.
 */
public static void main(String[] args)
{
    EventQueue.invokeLater(new Runnable()
    {
        public void run()
        {
            try
            {
                Test frame = new Test();
                frame.setVisible(true);

            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public Test()
{
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    GridBagLayout gbl_contentPane = new GridBagLayout();
    gbl_contentPane.columnWidths = new int[] { 0, 0 };
    gbl_contentPane.rowHeights = new int[] { 0, 0 };
    gbl_contentPane.columnWeights = new double[] { 0.0, Double.MIN_VALUE };
    gbl_contentPane.rowWeights = new double[] { 0.0, Double.MIN_VALUE };
    contentPane.setLayout(gbl_contentPane);

    JLabel lblNewLabel = new JLabel(
            "<html>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</html>");
    GridBagConstraints gbc_lblNewLabel = new GridBagConstraints();
    gbc_lblNewLabel.weightx = 1.0;
    gbc_lblNewLabel.fill = GridBagConstraints.BOTH;
    gbc_lblNewLabel.gridx = 0;
    gbc_lblNewLabel.gridy = 0;
    contentPane.add(lblNewLabel, gbc_lblNewLabel);
}

  }
4

3 回答 3

10

带有滚动条的文本区域

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

public class Test extends JFrame {

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Test frame = new Test();

                    JTextArea message = new JTextArea("Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
                        ,6,40);
                    // make it look & act like a label
                    message.setWrapStyleWord(true);
                    message.setLineWrap(true);
                    message.setEditable(false);
                    message.setFocusable(false);
                    message.setOpaque(false);

                    JScrollPane scrollPane =  new JScrollPane(message,
                        ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
                        ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER
                        );
                    frame.add(scrollPane);
                    frame.pack();
                    frame.setVisible(true);
                }
                catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public Test() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationByPlatform(true);
    }
}
于 2012-04-18T17:11:50.563 回答
2

我认为你需要实现接口 Scrollable。实际上 JTextArea 也实现了 Scrollable。

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Rectangle;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.Scrollable;
import javax.swing.border.EmptyBorder;

public class TestScrollLabel extends JFrame
{

private JPanel contentPane;

/**
 * Launch the application.
 */
public static void main(String[] args)
{
    EventQueue.invokeLater(new Runnable()
    {
        public void run()
        {
            try
            {
                TestScrollLabel frame = new TestScrollLabel();
                JScrollPane scrollPane =  new JScrollPane();
                scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
                JPanel panel = new MyPanel();
                //BorderLayout is a good choice here
                panel.setLayout(new BorderLayout());
                panel.add(new JLabel("<html>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</html>"));
                scrollPane.setViewportView(panel);
                frame.add(scrollPane);
                frame.setVisible(true);
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }
    });
}

static class MyPanel extends JPanel implements Scrollable{

    @Override
    public Dimension getPreferredScrollableViewportSize() {

        return this.getPreferredSize();
    }

    @Override
    public int getScrollableUnitIncrement(Rectangle visibleRect,
            int orientation, int direction) {
        return 50;
    }

    @Override
    public int getScrollableBlockIncrement(Rectangle visibleRect,
            int orientation, int direction) {
        return 80;
    }

    /*
     * (non-Javadoc)
     * @see javax.swing.Scrollable#getScrollableTracksViewportWidth()
     */
    @Override
    public boolean getScrollableTracksViewportWidth() {
        return true;
    }

    @Override
    public boolean getScrollableTracksViewportHeight() {
        return false;
    }

}

/**
 * Create the frame.
 */
public TestScrollLabel()
{
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    contentPane.setLayout(new BorderLayout(0, 0));
    setContentPane(contentPane);
}

}
于 2013-01-04T06:07:33.563 回答
0

JLabel没有自动换行功能。您可以通过创建一个来模拟这种效果，JTextArea使用它使其只读setEditable(false)，然后调用setWrapStyleWord(true)以启用自动换行。

我认为你也可以setBorder()尝试让它看起来更扁平，更像是一个普通的标签，但这可能会根据外观和感觉在不同的平台上产生不同的效果。

于 2012-04-18T17:08:54.820 回答