如何使JPanel可滚动? [英] How to make JPanel scrollable?

问题描述

我正在为大学项目创建GUI，并且试图了解JScrollPane的工作原理.

I'm creating GUI for my university project and I 'm trying to understand how JScrollPane works.

我已经成功编写了一个简单的程序，该程序以可滚动的方式显示图片:

I have successfully written simple program which shows picture in a scrollable way:

public class ScrollPaneTest{
    public static void main(String[] args){
        JFrame testFrame = new JFrame("ramka testowa");
        testFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JLabel picture = new JLabel(new ImageIcon("JavaSwingCompoentsList.PNG"));
        JScrollPane scrollPane = new JScrollPane(picture);

        testFrame.add(scrollPane, BorderLayout.CENTER);
        testFrame.setSize(400, 400);
        testFrame.setVisible(true);
    }
}

尽管在我的最终GUI中，我只想将JScrollPane应用于其中的一部分，例如单个JPanel.为了验证这个想法，我编写了以下代码，不幸的是，该代码不起作用:

Although, in my final GUI, I would like to apply JScrollPane only to a part of it, e.g. single JPanel. To test this idea I have written following code, which unfortunately does not work:

public class ScrollPaneTest{
    public static void main(String[] args){
        JFrame testFrame = new JFrame("ramka testowa");
        testFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JLabel picture = new JLabel(new ImageIcon("JavaSwingCompoentsList.PNG"));
        JScrollPane scrollPane = new JScrollPane(picture);

        JPanel insidePanel = new JPanel();
        insidePanel.add(scrollPane);
        testFrame.add(insidePanel, BorderLayout.CENTER);

        testFrame.setSize(400, 400);
        testFrame.setVisible(true);

    }
}

我已经阅读了许多教程，以及Stack和CodeRanch的文章，但我仍然无法理解JScrollPane的工作原理.我怀疑我的错误与指定JPanel -to-scroll的尺寸有关，但是我尝试过的每一种方法都没有给我滚动条或图片.

I have read numerous tutorials, as well as Stack and CodeRanch articles and I still fail to grasp the idea of how the JScrollPane work. I suspect, that my mistake has something to do with specifying the dimension of JPanel-to-scroll, but every single approach I have tried gave me no scrollbars or no picture at all.

如果您能为我提供解决此问题的正确方法，最重要的是，告诉我我哪里错了，我将不胜感激.

If you could show me the right solution to this problem and most importantly, show me where I was wrong I would be very grateful.

推荐答案

1. 使用图片初始化JPanel，而不是JScrollPane

2. 要将JPanel添加到JScrollPane，请执行以下操作:

1. Initialize JPanel, not JScrollPane with picture

2. To add the JPanel to JScrollPane, do:

scrollPane.setViewportView (panel)

将JScrollPane而不是JPanel添加到JFrame

Add the JScrollPane, not JPanel to the JFrame

这篇关于如何使JPanel可滚动?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！