个人中心
gpt4 book ai didi

Java Swing : Layout Manager like "North" in BorderLayout needed

转载 作者：行者123 更新时间：2023-12-01 12:10:22 26 4
gpt4 key购买 nike

我想要一个像边框布局管理器一样的布局管理器，除了只有一个区域:北。

边框布局管理器的北部区域对我来说工作正常(即占用正确的空间)，但是中心占用了所有可用空间(请参见下面的蓝色区域)。理想情况下，我希望中心占据零空间。

这可能吗？

谢谢。

示例 1(共 2 个)(图片)

example

示例 2(共 2)(代码)

import java.awt.*;

import javax.swing.*;
import javax.swing.text.html.HTMLEditorKit;

public class test
{
    public static void main(String[] args)
    {
         SwingUtilities.invokeLater(new Runnable()
        {
          public void run()
          {
            JFrame j = new JFrame("Test");
        WorkBench right = new WorkBench();

        JScrollPane sp 
            = new JScrollPane(
                    JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, 
                    JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

        sp.setAutoscrolls(false);
        sp.setViewportView(right);

        j.getContentPane().add(sp, BorderLayout.CENTER);

        right.addPortal(getNewPortalPane());
        right.addPortal(getNewPortalPane());

        SwingUtilities.invokeLater(new Runnable() 
        {
            public void run() {
                sp.getViewport().setViewPosition(new java.awt.Point(0, 0));
            }
        });


        // center the jframe, then make it visible
        j.setSize(800, 600);
        j.setLocationRelativeTo(null);
        j.setVisible(true);
      }
    });
  }


public static JPanel getNewPortalPane()
{
    JEditorPane html_box = new JEditorPane();
    html_box.setEditorKit(new HTMLEditorKit());
    html_box.setOpaque(true);
    html_box.setBackground(Color.WHITE);

    html_box.setContentType("text/html");

    String htmlString = "<html>\n"
        + "<body>\n"
        + "<h1>Welcomfve!  sdsdsdsdsd sdsdsd sdsd sdsd sdsd </h1>\n"
        + "<h2>This is an H2 header. sdsdsdsdsd sdsdsd sdsd sdsd sdsd </h2>\n"
        + "<p>This is some sample text  sdsdsdsdsd sdsdsd sdsd sdsd sdsd </p>\n"
        + "<p><a href=\"http://dsfsdfdf.com/blog/\">sdfsdfsdf blog</a></p>\n"
        + "</body>\n";

    html_box.setText(htmlString);


    JPanel p = new JPanel(new BorderLayout());
    p.setBackground(Color.blue);
    p.add(html_box, BorderLayout.NORTH);

    return p;
}

public static class WorkBench extends JPanel implements Scrollable
{
    private Box vertical_box = null;

    public WorkBench()
    {
        setLayout(new BorderLayout());

        this.vertical_box = Box.createVerticalBox();
        add(this.vertical_box , BorderLayout.CENTER);
    }

    public void addPortal(JPanel portal)
    {
        this.vertical_box.add(portal);

        validate();
    }

    @Override
    public Dimension getPreferredScrollableViewportSize() 
    {
        return getPreferredSize();
    }


    @Override
    public int getScrollableUnitIncrement(
            Rectangle visibleRect,
            int orientation, 
            int direction) 
    {
        return 20;
    }


    @Override
    public int getScrollableBlockIncrement(
            Rectangle visibleRect,
            int orientation, 
            int direction)
    {
        return 60;
    }


    @Override
    public boolean getScrollableTracksViewportWidth() 
    {
        return true;
    }


    @Override
    public boolean getScrollableTracksViewportHeight()
    {
         if (getParent() instanceof JViewport)
         {
             return (((JViewport)getParent()).getHeight() > getPreferredSize().height);
         }

         return false;
    }
}

}

最佳答案

可能有一个更优雅的解决方案，但我发现有效的是使用 BorderLayout.NORTH 添加内部面板，将内部面板的布局设置为 BoxLayout > 使用PAGE_AXIS，然后将组件添加到内部面板。因此，在您的示例中，它将是(编辑以修复滚动条):

public class test {

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

      public void run() {
        JFrame j = new JFrame("Test");
        WorkBench right = new WorkBench();

        final JScrollPane sp = new JScrollPane(
            JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
            JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

        sp.setAutoscrolls(false);
        sp.setViewportView(right);

        j.getContentPane().add(sp, BorderLayout.CENTER);

        right.addPortal(getNewPortalPane());
        right.addPortal(getNewPortalPane());

        SwingUtilities.invokeLater(new Runnable() {

          public void run() {
            sp.getViewport().setViewPosition(new java.awt.Point(0, 0));
          }
        });

        // center the jframe, then make it visible
        j.setSize(800, 600);
        j.setLocationRelativeTo(null);
        j.setVisible(true);
      }
    });
  }

  public static JPanel getNewPortalPane() {
    JEditorPane html_box = new JEditorPane();
    html_box.setEditorKit(new HTMLEditorKit());
    html_box.setOpaque(true);
    html_box.setBackground(Color.WHITE);

    html_box.setContentType("text/html");

    String htmlString = "<html>\n"
        + "<body>\n"
        + "<h1>Welcomfve!  sdsdsdsdsd sdsdsd sdsd sdsd sdsd </h1>\n"
        + "<h2>This is an H2 header. sdsdsdsdsd sdsdsd sdsd sdsd sdsd </h2>\n"
        + "<p>This is some sample text  sdsdsdsdsd sdsdsd sdsd sdsd sdsd </p>\n"
        + "<p><a href=\"http://dsfsdfdf.com/blog/\">sdfsdfsdf blog</a></p>\n"
        + "</body>\n";

    html_box.setText(htmlString);

    JPanel p = new JPanel(new BorderLayout());
    p.setBackground(Color.blue);
    p.add(html_box, BorderLayout.NORTH);

    return p;
  }

  public static class WorkBench extends JPanel implements Scrollable {

    private final JPanel inner;

    public WorkBench() {
      setLayout(new BorderLayout());
      inner = new JPanel();
      inner.setLayout(new BoxLayout(inner, BoxLayout.PAGE_AXIS));
      add(inner, BorderLayout.NORTH);
    }

    public void addPortal(JPanel portal) {
      inner.add(portal);
      validate();
    }

    @Override
    public Dimension getPreferredScrollableViewportSize() {
      return getPreferredSize();
    }

    @Override
    public int getScrollableUnitIncrement(Rectangle visibleRect,
        int orientation, int direction) {
      return 20;
    }

    @Override
    public int getScrollableBlockIncrement(Rectangle visibleRect,
        int orientation, int direction) {
      return 60;
    }

    @Override
    public boolean getScrollableTracksViewportWidth() {
      return true;
    }

    @Override
    public boolean getScrollableTracksViewportHeight() {
      if (getParent() instanceof JViewport) {
        return (((JViewport) getParent()).getHeight() > getPreferredSize().height);
      }

      return false;
    }
  }
}

关于Java Swing : Layout Manager like "North" in BorderLayout needed，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27313545/

26 4 0
文章推荐： java - 表示层中的实体类？
文章推荐： java - 将 JSON Builder 与集合结合使用
文章推荐： java - Hibernate IN关键字在where子句之前有什么用
文章推荐： python - 如何在matplotlib中为图中的每个子图设置标签？
行者123
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com