java 如何创建带有图标和文本的 JList？
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时间：2020-10-31 12:20:00 来源:igfitidea点击:
How to create JList with icon and text?
提问by Yaser Har
I have this code want to make JListtalk text and icon what must to do.
Some persons advice me to make list of label and in table put text an icon is it Possible? How?
我有这个代码想要让JList谈话文本和图标必须做什么。
有些人建议我制作标签列表，并在表格中放置一个图标，这可能吗？如何？
Search on /////////////////for embedded comment.
搜索/////////////////嵌入的评论。
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);
}
}
}
After solve this problem i will add action to each element if doubel click on it will open desktop
to path stored in list.
解决这个问题后，如果双击它会打开桌面
到列表中存储的路径，我将为每个元素添加操作。
回答by Andrew Thompson
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;
}
}
Original Answer
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);
Oh right.. Try a variant of the FileTreeCellRendererof File Browser GUI.
哦，对了..尝试的一个变种FileTreeCellRenderer的文件浏览器GUI。
That's it, used for the tree on the left.
就是这样，用于左侧的树。
FileTreeCellRenderer
文件树单元渲染器
/** 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;
}
}
Update
更新
An SSCCE that adapts the renderer above for lists.
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;
}
}
