如何创建带有图标和文本的 JList？

Posted 2023-02-26

【中文标题】如何创建带有图标和文本的 JList？

【英文标题】：How to create JList with icon and text?

【发布时间】：2012-10-31 11:14:58

【问题描述】：

我有这段代码想让JList 谈论文字和图标必须做什么。 有些人建议我制作标签列表并在表格中放置文本图标是否可能？如何？

在 ///////////////// 上搜索嵌入评论。

import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.swing.Icon;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.filechooser.FileSystemView;

public class pan extends JPanel implements DropTargetListener 

private DefaultListModel listModel = new DefaultListModel();
private DropTarget dropTarget;
private JLabel jLabel1;
private JScrollPane jScrollPane1;
private JList list;

/**
 * Create the panel.
 */
public pan() 
    setLayout(null);        
    list = new JList();
    dropTarget = new DropTarget(list, this);
    list.setModel(listModel);
    list.setDragEnabled(true);
    //list.setTransferHandler(new FileTransferHandler());
    jScrollPane1 = new JScrollPane();

    jScrollPane1.setViewportView(list);
    jScrollPane1.setBounds(10, 150, 635, 330);
    add(jScrollPane1);


public void dragEnter(DropTargetDragEvent arg0) 
    // nothing


public void dragOver(DropTargetDragEvent arg0) 
    // nothing


public void dropActionChanged(DropTargetDragEvent arg0) 
    // nothing


public void dragExit(DropTargetEvent arg0) 
    // nothing


public void drop(DropTargetDropEvent evt) 
    int action = evt.getDropAction();
    evt.acceptDrop(action);
    try 
        Transferable data = evt.getTransferable();
        if (data.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) 
              List<File> files = (List<File>) data.getTransferDat(DataFlavor.javaFileListFlavor);
            for (File file : files) 

    Icon icon=FileSystemView.getFileSystemView().getSystemIcon(file);
/////////////////listModel.addElement(filepath+icon);///////////////////////want code do this

            
        
     catch (UnsupportedFlavorException e) 
        e.printStackTrace();
     catch (IOException e) 
        e.printStackTrace();
     finally 
        evt.dropComplete(true);
    
 

解决此问题后，如果双击它会打开桌面，我将为每个元素添加操作 到存储在列表中的路径。

【问题讨论】：

见How to Use Lists: Writing a Custom Cell Renderer。

【参考方案1】：

import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import javax.swing.*;
import javax.swing.border.LineBorder;
import javax.swing.filechooser.FileSystemView;
import java.io.*;
import java.util.List;

public class FileDropList extends JPanel implements DropTargetListener 

    private DefaultListModel listModel = new DefaultListModel();
    private DropTarget dropTarget;
    private JLabel jLabel1;
    private JScrollPane jScrollPane1;
    private JList list;

    /**
     * Create the panel.
     */
    public FileDropList() 
        //setLayout(null);        
        list = new JList();
        dropTarget = new DropTarget(list, this);
        list.setModel(listModel);
        list.setDragEnabled(true);
        FileListCellRenderer renderer = new FileListCellRenderer();
        list.setCellRenderer(renderer);
        //list.setTransferHandler(new FileTransferHandler());
        jScrollPane1 = new JScrollPane(list);

        //jScrollPane1.setBounds(10, 150, 635, 330);
        add(jScrollPane1);

    
    public static void main(String[] args) throws Exception 
        Runnable r = new Runnable() 
            @Override
            public void run() 
                JPanel pan = new FileDropList();
                pan.setBorder(new LineBorder(Color.BLACK));
                JOptionPane.showMessageDialog(null, pan);
            
        ;
        SwingUtilities.invokeLater(r);
    

    public void dragEnter(DropTargetDragEvent arg0) 
        // nothing
    

    public void dragOver(DropTargetDragEvent arg0) 
        // nothing
    

    public void dropActionChanged(DropTargetDragEvent arg0) 
        // nothing
    

    public void dragExit(DropTargetEvent arg0) 
        // nothing
    

    public void drop(DropTargetDropEvent evt) 
        int action = evt.getDropAction();
        evt.acceptDrop(action);
        try 
            Transferable data = evt.getTransferable();
            if (data.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) 
                List<File> files = (List<File>) data.getTransferData(DataFlavor.javaFileListFlavor);
                for (File file : files) 
                    listModel.addElement(file);
                
            
         catch (UnsupportedFlavorException e) 
            e.printStackTrace();
         catch (IOException e) 
            e.printStackTrace();
         finally 
            evt.dropComplete(true);
        
    


/** A FileListCellRenderer for a File. */
class FileListCellRenderer extends DefaultListCellRenderer 

    private static final long serialVersionUID = -7799441088157759804L;
    private FileSystemView fileSystemView;
    private JLabel label;
    private Color textSelectionColor = Color.BLACK;
    private Color backgroundSelectionColor = Color.CYAN;
    private Color textNonSelectionColor = Color.BLACK;
    private Color backgroundNonSelectionColor = Color.WHITE;

    FileListCellRenderer() 
        label = new JLabel();
        label.setOpaque(true);
        fileSystemView = FileSystemView.getFileSystemView();
    

    @Override
    public Component getListCellRendererComponent(
            JList list,
            Object value,
            int index,
            boolean selected,
            boolean expanded) 

        File file = (File)value;
        label.setIcon(fileSystemView.getSystemIcon(file));
        label.setText(fileSystemView.getSystemDisplayName(file));
        label.setToolTipText(file.getPath());

        if (selected) 
            label.setBackground(backgroundSelectionColor);
            label.setForeground(textSelectionColor);
         else 
            label.setBackground(backgroundNonSelectionColor);
            label.setForeground(textNonSelectionColor);
        

        return label;
    

原答案

import java.awt.datatransfer.*;
import java.awt.dnd.*;
import javax.swing.*;
import javax.swing.filechooser.FileSystemView;
import java.io.*;
import java.util.List;

public class FileDragList extends JPanel implements DropTargetListener 

    private static final long serialVersionUID = 1L;
    private DefaultListModel listModel = new DefaultListModel();
    private JScrollPane jScrollPane1;
    private JList list;

    /**
     * Create the panel.
     */
    public FileDragList() 
        setLayout(null);        
        list = new JList();
        DropTarget dropTarget = new DropTarget(list, this);
        list.setModel(listModel);
        list.setDragEnabled(true);
        FileListCellRenderer renderer = new FileListCellRenderer();
        list.setCellRenderer(renderer);
        //list.setTransferHandler(new FileTransferHandler());
        jScrollPane1 = new JScrollPane();

        jScrollPane1.setViewportView(list);
        jScrollPane1.setBounds(10, 150, 635, 330);
        add(jScrollPane1);

    
    public static void main(String[] args) throws Exception 
        Runnable r = new Runnable() 
            @Override
            public void run() 
                JOptionPane.showMessageDialog(null, new FileDragList());
            
        ;
        SwingUtilities.invokeLater(r);
    

    public void dragEnter(DropTargetDragEvent arg0) 
        // nothing
    

    public void dragOver(DropTargetDragEvent arg0) 
        // nothing
    

    public void dropActionChanged(DropTargetDragEvent arg0) 
        // nothing
    

    public void dragExit(DropTargetEvent arg0) 
        // nothing
    

    public void drop(DropTargetDropEvent evt) 
        int action = evt.getDropAction();
        evt.acceptDrop(action);
        try 
            Transferable data = evt.getTransferable();
            if (data.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) 
                List<File> files = (List<File>) data.getTransferData(DataFlavor.javaFileListFlavor);
                for (File file : files) 

                    Icon icon=FileSystemView.getFileSystemView().getSystemIcon(file);
                    /////////////////listModel.addElement(filepath+icon);///////////////////////want code do this

                
            
         catch (UnsupportedFlavorException e) 
            e.printStackTrace();
         catch (IOException e) 
            e.printStackTrace();
         finally 
            evt.dropComplete(true);
        
    

---

Icon icon=FileSystemView.getFileSystemView().getSystemIcon(file);

哦，对了。尝试使用File Browser GUI 的FileTreeCellRenderer 的变体。

就是这样，用于左边的树。

FileTreeCellRenderer

/** A TreeCellRenderer for a File. */
class FileTreeCellRenderer extends DefaultTreeCellRenderer 

    private FileSystemView fileSystemView;
    private JLabel label;

    FileTreeCellRenderer() 
        label = new JLabel();
        label.setOpaque(true);
        fileSystemView = FileSystemView.getFileSystemView();
    

    @Override
    public Component getTreeCellRendererComponent(
        JTree tree,
        Object value,
        boolean selected,
        boolean expanded,
        boolean leaf,
        int row,
        boolean hasFocus) 

        DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
        File file = (File)node.getUserObject();
        label.setIcon(fileSystemView.getSystemIcon(file));
        label.setText(fileSystemView.getSystemDisplayName(file));
        label.setToolTipText(file.getPath());

        if (selected) 
            label.setBackground(backgroundSelectionColor);
            label.setForeground(textSelectionColor);
         else 
            label.setBackground(backgroundNonSelectionColor);
            label.setForeground(textNonSelectionColor);
        

        return label;
    

更新

一个 SSCCE，它使上面的渲染器适应列表。

import java.awt.*;
import javax.swing.*;
import javax.swing.filechooser.FileSystemView;
import java.io.File;

public class FileList 
    public static void main(String[] args) throws Exception 
        Runnable r = new Runnable() 
            @Override
            public void run() 
                JPanel gui = new JPanel(new BorderLayout(2,2));

                File userHome = new File(System.getProperty("user.home"));
                File[] files = userHome.listFiles();
                JList list = new JList(files);
                list.setCellRenderer(new FileListCellRenderer());
                gui.add(new JScrollPane(list));

                JOptionPane.showMessageDialog(null, gui);
            
        ;
        SwingUtilities.invokeLater(r);
    


/** A FileListCellRenderer for a File. */
class FileListCellRenderer extends DefaultListCellRenderer 

    private static final long serialVersionUID = -7799441088157759804L;
    private FileSystemView fileSystemView;
    private JLabel label;
    private Color textSelectionColor = Color.BLACK;
    private Color backgroundSelectionColor = Color.CYAN;
    private Color textNonSelectionColor = Color.BLACK;
    private Color backgroundNonSelectionColor = Color.WHITE;

    FileListCellRenderer() 
        label = new JLabel();
        label.setOpaque(true);
        fileSystemView = FileSystemView.getFileSystemView();
    

    @Override
    public Component getListCellRendererComponent(
        JList list,
        Object value,
        int index,
        boolean selected,
        boolean expanded) 

        File file = (File)value;
        label.setIcon(fileSystemView.getSystemIcon(file));
        label.setText(fileSystemView.getSystemDisplayName(file));
        label.setToolTipText(file.getPath());

        if (selected) 
            label.setBackground(backgroundSelectionColor);
            label.setForeground(textSelectionColor);
         else 
            label.setBackground(backgroundNonSelectionColor);
            label.setForeground(textNonSelectionColor);
        

        return label;