标签：java image swing netbeans jscrollpane
我有一个JPanel我想在该面板中添加多个图像&还提供垂直滚动以显示图像.图像可能具有不同的大小.
我怎样才能做到这一点？
解决方法:
对于尺寸不均匀的图像,请在JList中使用文本& /或“小图标”渲染器,&把它放在BorderLayout的PAGE_START中.添加一个监听器,然后在CENTER的JScrollPane中的JLabel中显示所选图像.像这样的东西：
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.imageio.ImageIO;
public class ImageList {
private JPanel gui;
private JFileChooser fileChooser;
FilenameFilter fileNameFilter;
private JMenuBar menuBar;
DefaultListModel model;
ImageList() {
gui = new JPanel(new GridLayout());
JPanel imageViewContainer = new JPanel(new GridBagLayout());
final JLabel imageView = new JLabel();
imageViewContainer.add(imageView);
model = new DefaultListModel();
final JList imageList = new JList(model);
imageList.setCellRenderer(new IconCellRenderer());
ListSelectionListener listener = new ListSelectionListener() {
@Override
public void valueChanged(ListSelectionEvent lse) {
Object o = imageList.getSelectedValue();
if (o instanceof BufferedImage) {
imageView.setIcon(new ImageIcon((BufferedImage)o));
}
}
};
imageList.addListSelectionListener(listener);
fileChooser = new JFileChooser();
String[] imageTypes = ImageIO.getReaderFileSuffixes();
FileNameExtensionFilter fnf = new FileNameExtensionFilter("Images", imageTypes);
fileChooser.setFileFilter(fnf);
File userHome = new File(System.getProperty("user.home"));
fileChooser.setSelectedFile(userHome);
fileNameFilter = new FilenameFilter() {
@Override
public boolean accept(File file, String name) {
return true;
}
};
menuBar = new JMenuBar();
JMenu menu = new JMenu("File");
menuBar.add(menu);
JMenuItem browse = new JMenuItem("Browse");
menu.add(browse);
browse.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent ae) {
int result = fileChooser.showOpenDialog(gui);
if (result==JFileChooser.APPROVE_OPTION) {
File eg = fileChooser.getSelectedFile();
// this will be an image, we want the parent directory
File dir = eg.getParentFile();
try {
loadImages(dir);
} catch(Exception e) {
e.printStackTrace();
JOptionPane.showMessageDialog(
gui,
e,
"Load failure!",
JOptionPane.ERROR_MESSAGE);
}
}
}
});
gui.add(new JSplitPane(
JSplitPane.HORIZONTAL_SPLIT,
new JScrollPane(
imageList,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER),
new JScrollPane(imageViewContainer)));
}
public void loadImages(File directory) throws IOException {
File[] imageFiles = directory.listFiles(fileNameFilter);
BufferedImage[] images = new BufferedImage[imageFiles.length];
model.removeAllElements();
for (int ii=0; ii<images.length; ii++) {
model.addElement(ImageIO.read(imageFiles[ii]));
}
}
public Container getGui() {
return gui;
}
public JMenuBar getMenuBar() {
return menuBar;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
ImageList imageList = new ImageList();
JFrame f = new JFrame("Image Browser");
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.add(imageList.getGui());
f.setJMenuBar(imageList.getMenuBar());
f.setLocationByPlatform(true);
f.pack();
f.setSize(800,600);
f.setVisible(true);
}
});
}
}
class IconCellRenderer extends DefaultListCellRenderer {
private static final long serialVersionUID = 1L;
private int size;
private BufferedImage icon;
IconCellRenderer() {
this(100);
}
IconCellRenderer(int size) {
this.size = size;
icon = new BufferedImage(size,size,BufferedImage.TYPE_INT_ARGB);
}
@Override
public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
Component c = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (c instanceof JLabel && value instanceof BufferedImage) {
JLabel l = (JLabel)c;
l.setText("");
BufferedImage i = (BufferedImage)value;
l.setIcon(new ImageIcon(icon));
Graphics2D g = icon.createGraphics();
g.setColor(new Color(0,0,0,0));
g.clearRect(0, 0, size, size);
g.drawImage(i,0,0,size,size,this);
g.dispose();
}
return c;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(size, size);
}
}
如果图像大小相同,请参阅this answer.(在规范澄清之前,这是答案的顶部.我离开了它,因为它是如此可爱的屏幕截图.)
标签：java,image,swing,netbeans,jscrollpane 来源： https://codeday.me/bug/20190927/1823932.html
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