【好文章】JScrollPane JPanel FlowLayout自动换行

本文主要是介绍【好文章】JScrollPane JPanel FlowLayout自动换行，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

今天上午没什么事儿，打开CSDN的BBS，发现有人在问一个关于布局管理器的问题，请看：关于布局的一个问题。说实话，开始我并不相信楼主说的这句话“然后我在JPanel外面套了一个JScrollPane，却发现图片会一直往右边加，超出JPanel的宽度则出现横向的滚动条，与预想的效果相差较大。”

于是写下下面的代码：

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01.import java.awt.*;
02.import java.awt.event.*;
03.import javax.swing.*;
04.
05.
06.public class SimpleTest extends JFrame{
07.    private ImageIcon image;
08.    private JLabel label;
09.    private JButton button;
10.    private JPanel buttonPanel, imagePanel;
11.    private JScrollPane scrollPane;
12.    private Container container;
13.
14.    public SimpleTest(int xPixels, int yPixels){
15.        super("Add Image");
16.
17.        button = new JButton("Add Image");
18.        image = new ImageIcon("C:/1.jpg");
19.        imagePanel = new JPanel(new FlowLayout(FlowLayout.LEFT, 5, 5));
20.        scrollPane = new JScrollPane(imagePanel);
21.
22.        button.addActionListener(new ActionListener(){
23.            public void actionPerformed(ActionEvent e){
24.                label = new JLabel(image);
25.                imagePanel.add(label);
26.                validate();
27.            }
28.        });
29.
30.        buttonPanel = new JPanel(new GridLayout(1, 5));
31.        buttonPanel.add(button);
32.
33.        container = getContentPane();
34.        container.setLayout(new GridLayout(2, 1));
35.
36.        container.add(buttonPanel);
37.        container.add(scrollPane);
38.
39.        setSize(xPixels, yPixels);
40.        setVisible(true);
41.    }
42.
43.    public static void main(String[] args) {
44.        new SimpleTest(400, 400);
45.    }
46.}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SimpleTest extends JFrame{
private ImageIcon image;
private JLabel label;
private JButton button;
private JPanel buttonPanel, imagePanel;
private JScrollPane scrollPane;
private Container container;

public SimpleTest(int xPixels, int yPixels){
  super("Add Image");

  button = new JButton("Add Image");
  image = new ImageIcon("C:/1.jpg");
  imagePanel = new JPanel(new FlowLayout(FlowLayout.LEFT, 5, 5));
  scrollPane = new JScrollPane(imagePanel);

  button.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e){
    label = new JLabel(image);
    imagePanel.add(label);
    validate();
   }
  });

  buttonPanel = new JPanel(new GridLayout(1, 5));
  buttonPanel.add(button);

  container = getContentPane();
  container.setLayout(new GridLayout(2, 1));

  container.add(buttonPanel);
  container.add(scrollPane);

  setSize(xPixels, yPixels);
  setVisible(true);
}

public static void main(String[] args) {
  new SimpleTest(400, 400);
}
}