JScrollPane和JPanel [英] JScrollPane and JPanel

问题描述

因此，我正在制作一种文本编辑器，并且需要JScrollPane进行垂直导航. 但是我无法正常工作.

So, I'm making a kind of text editor, and I need a JScrollPane for vertical navigation. But I can't get it to work.

我已经阅读了Google搜索结果的前十页上的每本怪胎教程，但无法正常工作.

I have read every freaking tutorial on first ten pages of google results, and I can't get it to work.

假设我有JFrame(尺寸为1000x800).我想在其中放置一个JPanel(1000x2000)，使其与JFrame水平对齐.我想在JPanel的右侧粘贴一个简单的滚动条，以便可以开始使用它的其余部分.

Lets say I have JFrame (size 1000x800). I want to put a JPanel (1000x2000) in it so that it horizontally alignes with the JFrame. I want to stick a simple scroll bar to the right side of the JPanel so I can get to the rest of it.

我减小了尺寸，我将JPanel添加到JScrollBar中，反之亦然，将其中之一添加到JFrame中，两者都没有，但是什么也没有.

I have reduced sizes, I have added JPanel to JScrollBar and vice versa, added one of them to JFrame, both, none, but nothing.

因此，在这一点上，我不介意几行完成的代码...

So, at this point, I wouldn't mind a couple of lines of finished code...

很好，这是代码...

Fine, here's the code...

mWindow = new JFrame(lang.getString("title"));
mWindow.setSize(1000, 800);
mWindow.setLocationRelativeTo(null);
mWindow.setResizable(false);
mWindow.setLayout(null);
mWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

mWindow.setVisible(true);

workspace = new JPanel();
workspace.setBounds(0,0, 1000, 1203);
workspace.setBackground(Color.RED);

scroll = new JScrollPane(workspace, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scroll.setBounds(0, 20, 600, 600);
//scroll.setLayout(null);
mWindow.getContentPane().add(scroll);
mWindow.repaint();
mWindow.validate();

这显示了JPanel的一部分(600X600，(JScrollPane大小))，并显示了滚动条，但不可滚动

That shows a part of JPanel (600X600, (JScrollPane size)), and shows scrollbars, but isn't scrollable

推荐答案

因此，我进行了这项非常快速的测试，对我来说效果很好...

So, I did this really quick test and it works fine for me...

public class TestPane extends JPanel {

    public TestPane() {

        setBorder(new LineBorder(Color.RED));
        // This is for demonstration purposes only
        // One should always rely on the layout manager
        // to define this value
        // Thank kleopatra 
        setPreferredSize(new Dimension(1000, 1000));

    }

    @Override
    protected void paintComponent(Graphics g) {

        super.paintComponent(g);

        FontMetrics fm = g.getFontMetrics();

        Dimension size = getPreferredSize();
        String text = "Pref: " + size.width + "x" + size.height;
        g.drawString(text, 0, fm.getAscent());

        size = getSize();
        text = "Size: " + size.width + "x" + size.height;
        g.drawString(text, 0, fm.getHeight() + fm.getAscent());

    }

}

和测试框架

public class TestFrame {

    public static void main(String args[]) {

        JFrame frame = new JFrame();
        frame.setLayout(new BorderLayout());

        JScrollPane scroll = new JScrollPane(new TestPane());

        frame.add(scroll);

        frame.setSize(500, 500);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);

    }

}

哪个产生这个:

在旁注中，我不知道为什么人们坚持使用null布局，它们只会造成更多的麻烦和心痛，而他们不值得.花时间找到一些简单的布局管理器.由于很多原因，我讨厌VB，但是布局管理是我列表中的第一位，恕我直言

On a side note, I don't know why people insist on using null layouts, they just cause more trouble and heart ache then they're worth. Take the time to find some simple layout managers. I hate VB for a lot of reasons, but layout management is at the top of my list, IMHO

这篇关于JScrollPane和JPanel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！