Java ScrollPane 重叠内容

发布于 2024-12-06 15:55:03 字数 760 浏览 0 评论 0原文

我确信我的 JScrollPanes 遇到了一个初学者问题。问题在于垂直滚动条与封闭面板（右侧）内的组件重叠。当滚动条与 JComboBox 的下拉位重叠时，这会变得有点痛苦。

我已将问题归结为这个小片段 - 我希望它能说明问题。

public class ScrollTest extends JFrame
{
    public ScrollTest()
    {
        super("Overlap issues!");
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(100,0));

        for(int b=0;b<100;++b)
        {
            panel.add(new JButton("Small overlap here ->"));
        }

        JScrollPane scrollpane = new JScrollPane(panel);
        add(scrollpane);
        pack();
        setVisible(true);
    }

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

我先看了一下，但不知道是否有其他人已经解决了这个问题。抱歉，如果它是重复的，非常感谢任何人都可以提供像我这样的 java-newb 的帮助！

原文

I'm having what I am sure is very much a beginners problem with my JScrollPanes. The problem is that the vertical scrollbar overlaps the components within the enclosed panel (on the right hand side). It becomes a bit of a pain when the scrollbar overlaps the drop-down bit of JComboBoxes.

I have boiled the problem down to this little snippet - I hope it illustrates the issue.

public class ScrollTest extends JFrame
{
    public ScrollTest()
    {
        super("Overlap issues!");
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(100,0));

        for(int b=0;b<100;++b)
        {
            panel.add(new JButton("Small overlap here ->"));
        }

        JScrollPane scrollpane = new JScrollPane(panel);
        add(scrollpane);
        pack();
        setVisible(true);
    }

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

I had a look first but couldn't see if anyone else had already addressed this problem. Sorry if it's a duplicate and many thanks for any help anyone can offer a java-newb like me!

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

梦言归人 2024-12-13 15:55:03

问题在于，JScrollPane 的默认设置是使用默认值 JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED 来布局组件，这反过来会添加滚动条，而无需再次布局组件。

在您的示例中，您知道您将需要一个滚动条，因此将其更改为始终显示滚动条

public class ScrollTest extends JFrame
{
    public ScrollTest()
    {
        super("Overlap issues!");
        JPanel panel = new JPanel();
        //Insets insets = panel.getInsets();
        //insets.set(5, 5, 5, 25);
        //insets.set(top, left, bottom, right);
        panel.setLayout(new GridLayout(100,0));

        for(int b=0;b<100;++b)
        {
            panel.add(new JButton("Small overlap here ->"));
        }

        JScrollPane scrollpane = new JScrollPane(panel);
        scrollpane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        add(scrollpane);
        pack();
        setVisible(true);
    }

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

The problem is that the default for a JScrollPane is to layout the components with a default of JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED which in turn adds the scrollbar without laying out the components again.

In your example you know you will need a scrollbar so change it to always display the scrollbar

public class ScrollTest extends JFrame
{
    public ScrollTest()
    {
        super("Overlap issues!");
        JPanel panel = new JPanel();
        //Insets insets = panel.getInsets();
        //insets.set(5, 5, 5, 25);
        //insets.set(top, left, bottom, right);
        panel.setLayout(new GridLayout(100,0));

        for(int b=0;b<100;++b)
        {
            panel.add(new JButton("Small overlap here ->"));
        }

        JScrollPane scrollpane = new JScrollPane(panel);
        scrollpane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        add(scrollpane);
        pack();
        setVisible(true);
    }

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

回复收藏 0 原文

~没有更多了~