滚动 JPanel [英] Scrolling a JPanel

问题描述

我想要一个具有大小和位置的 JPanel.在 JPanel 中，我水平插入了一定数量的元素(按钮).因为我的 JPanel 有一个定义的宽度，如果我添加很多按钮，我看不到那个.在这种情况下，我需要此 JPanel 的滚动条.但是这个 JPanel 必须是 JFrame 内特定位置的特定尺寸.JPanel 的滚动条已水平放置在其下方.有人可以帮助我吗?我试过没有成功！

I want a JPanel with a size and defined position. Inside the JPanel, I've certain number of elements (buttons) inserted horizontally. Because my JPanel has a defined width, if I add much buttons, I couldn't see that. In this case, I need a scrollbar for this JPanel. But this JPanel must be a CERTAIN SIZE IN A CERTAIN POSITION inside a JFrame. The scrollbar of the JPanel has positioned under it horizontally. Someone can help me? I've tried it without success!

推荐答案

使用 JScrollPane 并将其 preferredSize 强制为您给定的大小(或将 scrollPane 容器 LayoutManager 设置为 null 并在滚动窗格上调用 setBounds()).还要设置滚动条策略.这是其中的一个小示例:

Use a JScrollPane and force its preferredSize to your given size (or set the scrollPane container LayoutManager to null and call setBounds() on the scrollpane). Also set the scrollbar policies. Here is a small sample of that:

import java.awt.Dimension;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class Test {

    public static void main(String... args) {
        JFrame frame = new JFrame();
        JPanel panel = new JPanel();
        for (int i = 0; i < 10; i++) {
            panel.add(new JButton("Hello-" + i));
        }
        JScrollPane scrollPane = new JScrollPane(panel);
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
        scrollPane.setBounds(50, 30, 300, 50);
        JPanel contentPane = new JPanel(null);
        contentPane.setPreferredSize(new Dimension(500, 400));
        contentPane.add(scrollPane);
        frame.setContentPane(contentPane);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.setVisible(true);
    }
}

这篇关于滚动 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！