我有一个自定义的JTree，它有一个非常适合默认模型的复选框：
public final class MainPanel extends JPanel {
private MainPanel() {
super(new BorderLayout());
JTree tree = new JTree() {
@Override public void updateUI() {
setCellRenderer(null);
setCellEditor(null);
super.updateUI();
//???#1: JDK 1.6.0 bug??? Nimbus LnF
setCellRenderer(new CheckBoxNodeRenderer());
setCellEditor(new CheckBoxNodeEditor());
}
};
String src = "D:\\Documents\\NetBeansProjects\\TREE\\src\\tree";
TreeModel model = tree.getModel(new FileSystemModel(new File(src)));
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
Enumeration e = root.breadthFirstEnumeration();
while (e.hasMoreElements()) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.nextElement();
Object o = node.getUserObject();
if (o instanceof String) {
node.setUserObject(new CheckBoxNode((String) o, Status.DESELECTED));
}
}
model.addTreeModelListener(new CheckBoxStatusUpdateListener());
tree.setEditable(true);
tree.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));
//???#1: JDK 1.6.0 bug??? Nimbus LnF
//tree.setCellRenderer(new CheckBoxNodeRenderer());
//tree.setCellEditor(new CheckBoxNodeEditor());
tree.expandRow(0);
//tree.setToggleClickCount(1);
setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
add(new JScrollPane(tree));
setPreferredSize(new Dimension(320, 240));
}
public static void main(String... args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
//for (UIManager.LookAndFeelInfo laf: UIManager.getInstalledLookAndFeels())
// if ("Nimbus".equals(laf.getName())) { UIManager.setLookAndFeel(laf.getClassName()); }
} catch (ClassNotFoundException | InstantiationException
| IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("CheckBoxNodeEditor");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class TriStateCheckBox extends JCheckBox {
private Icon currentIcon;
@Override public void updateUI() {
currentIcon = getIcon();
setIcon(null);
super.updateUI();
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
if (currentIcon != null) {
setIcon(new IndeterminateIcon());
}
setOpaque(false);
}
});
}
}
class IndeterminateIcon implements Icon {
private static final Color FOREGROUND = new Color(50, 20, 255, 200); //TEST: UIManager.getColor("CheckBox.foreground");
private static final int SIDE_MARGIN = 4;
private static final int HEIGHT = 1;
private final Icon icon = UIManager.getIcon("CheckBox.icon");
@Override public void paintIcon(Component c, Graphics g, int x, int y) {
icon.paintIcon(c, g, x, y);
int w = getIconWidth();
int h = getIconHeight();
Graphics2D g2 = (Graphics2D) g.create();
g2.setPaint(FOREGROUND);
g2.translate(x, y);
g2.fillRect(SIDE_MARGIN, (h - HEIGHT) / 2, w - SIDE_MARGIN - SIDE_MARGIN, HEIGHT);
//g2.translate(-x, -y);
g2.dispose();
}
@Override public int getIconWidth() {
return icon.getIconWidth();
}
@Override public int getIconHeight() {
return icon.getIconHeight();
}
}
enum Status { SELECTED, DESELECTED, INDETERMINATE }
class CheckBoxNode {
public final String label;
public final Status status;
public CheckBoxNode(String label) {
this.label = label;
status = Status.INDETERMINATE;
}
public CheckBoxNode(String label, Status status) {
this.label = label;
this.status = status;
}
@Override public String toString() {
return label;
}
}
class CheckBoxStatusUpdateListener implements TreeModelListener {
private boolean adjusting;
@Override public void treeNodesChanged(TreeModelEvent e) {
if (adjusting) {
return;
}
adjusting = true;
TreePath parent = e.getTreePath();
Object[] children = e.getChildren();
DefaultTreeModel model = (DefaultTreeModel) e.getSource();
DefaultMutableTreeNode node;
CheckBoxNode c; // = (CheckBoxNode) node.getUserObject();
if (children != null && children.length == 1) {
node = (DefaultMutableTreeNode) children[0];
c = (CheckBoxNode) node.getUserObject();
DefaultMutableTreeNode n = (DefaultMutableTreeNode) parent.getLastPathComponent();
while (n != null) {
updateParentUserObject(n);
DefaultMutableTreeNode tmp = (DefaultMutableTreeNode) n.getParent();
if (tmp == null) {
break;
} else {
n = tmp;
}
}
model.nodeChanged(n);
} else {
node = (DefaultMutableTreeNode) model.getRoot();
c = (CheckBoxNode) node.getUserObject();
}
updateAllChildrenUserObject(node, c.status);
model.nodeChanged(node);
adjusting = false;
}
private void updateParentUserObject(DefaultMutableTreeNode parent) {
String label = ((CheckBoxNode) parent.getUserObject()).label;
int selectedCount = 0;
int indeterminateCount = 0;
Enumeration children = parent.children();
while (children.hasMoreElements()) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) children.nextElement();
CheckBoxNode check = (CheckBoxNode) node.getUserObject();
if (check.status == Status.INDETERMINATE) {
indeterminateCount++;
break;
}
if (check.status == Status.SELECTED) {
selectedCount++;
}
}
if (indeterminateCount > 0) {
parent.setUserObject(new CheckBoxNode(label));
} else if (selectedCount == 0) {
parent.setUserObject(new CheckBoxNode(label, Status.DESELECTED));
} else if (selectedCount == parent.getChildCount()) {
parent.setUserObject(new CheckBoxNode(label, Status.SELECTED));
} else {
parent.setUserObject(new CheckBoxNode(label));
}
}
private void updateAllChildrenUserObject(DefaultMutableTreeNode root, Status status) {
Enumeration breadth = root.breadthFirstEnumeration();
while (breadth.hasMoreElements()) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) breadth.nextElement();
if (Objects.equals(root, node)) {
continue;
}
CheckBoxNode check = (CheckBoxNode) node.getUserObject();
node.setUserObject(new CheckBoxNode(check.label, status));
}
}
@Override public void treeNodesInserted(TreeModelEvent e) { /* not needed */ }
@Override public void treeNodesRemoved(TreeModelEvent e) { /* not needed */ }
@Override public void treeStructureChanged(TreeModelEvent e) { /* not needed */ }
}
//*
// extends JCheckBox TreeCellRenderer Editor version
class CheckBoxNodeRenderer extends TriStateCheckBox implements TreeCellRenderer {
private final DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
private final JPanel panel = new JPanel(new BorderLayout());
public CheckBoxNodeRenderer() {
super();
String uiName = getUI().getClass().getName();
if (uiName.contains("Synth") && System.getProperty("java.version").startsWith("1.7.0")) {
System.out.println("XXX: FocusBorder bug?, JDK 1.7.0, Nimbus start LnF");
renderer.setBackgroundSelectionColor(new Color(0, 0, 0, 0));
}
panel.setFocusable(false);
panel.setRequestFocusEnabled(false);
panel.setOpaque(false);
panel.add(this, BorderLayout.WEST);
this.setOpaque(false);
}
@Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
JLabel l = (JLabel) renderer.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
l.setFont(tree.getFont());
if (value instanceof DefaultMutableTreeNode) {
this.setEnabled(tree.isEnabled());
this.setFont(tree.getFont());
Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
if (userObject instanceof CheckBoxNode) {
CheckBoxNode node = (CheckBoxNode) userObject;
if (node.status == Status.INDETERMINATE) {
setIcon(new IndeterminateIcon());
} else {
setIcon(null);
}
l.setText(node.label);
setSelected(node.status == Status.SELECTED);
}
//panel.add(this, BorderLayout.WEST);
panel.add(l);
return panel;
}
return l;
}
@Override public void updateUI() {
super.updateUI();
if (panel != null) {
//panel.removeAll(); //??? Change to Nimbus LnF, JDK 1.6.0
panel.updateUI();
//panel.add(this, BorderLayout.WEST);
}
setName("Tree.cellRenderer");
//???#1: JDK 1.6.0 bug??? @see 1.7.0 DefaultTreeCellRenderer#updateUI()
//if (System.getProperty("java.version").startsWith("1.6.0")) {
// renderer = new DefaultTreeCellRenderer();
//}
}
}
class CheckBoxNodeEditor extends TriStateCheckBox implements TreeCellEditor {
private final DefaultTreeCellRenderer renderer = new DefaultTreeCellRenderer();
private final JPanel panel = new JPanel(new BorderLayout());
private String str;
public CheckBoxNodeEditor() {
super();
this.addActionListener(new ActionListener() {
@Override public void actionPerformed(ActionEvent e) {
//System.out.println("actionPerformed: stopCellEditing");
stopCellEditing();
}
});
panel.setFocusable(false);
panel.setRequestFocusEnabled(false);
panel.setOpaque(false);
panel.add(this, BorderLayout.WEST);
this.setOpaque(false);
}
@Override public Component getTreeCellEditorComponent(JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row) {
//JLabel l = (JLabel) renderer.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
JLabel l = (JLabel) renderer.getTreeCellRendererComponent(tree, value, true, expanded, leaf, row, true);
l.setFont(tree.getFont());
if (value instanceof DefaultMutableTreeNode) {
this.setEnabled(tree.isEnabled());
this.setFont(tree.getFont());
Object userObject = ((DefaultMutableTreeNode) value).getUserObject();
if (userObject instanceof CheckBoxNode) {
CheckBoxNode node = (CheckBoxNode) userObject;
if (node.status == Status.INDETERMINATE) {
setIcon(new IndeterminateIcon());
} else {
setIcon(null);
}
l.setText(node.label);
setSelected(node.status == Status.SELECTED);
str = node.label;
}
//panel.add(this, BorderLayout.WEST);
panel.add(l);
return panel;
}
return l;
}
@Override public Object getCellEditorValue() {
return new CheckBoxNode(str, isSelected() ? Status.SELECTED : Status.DESELECTED);
}
@Override public boolean isCellEditable(EventObject e) {
if (e instanceof MouseEvent && e.getSource() instanceof JTree) {
MouseEvent me = (MouseEvent) e;
JTree tree = (JTree) e.getSource();
TreePath path = tree.getPathForLocation(me.getX(), me.getY());
Rectangle r = tree.getPathBounds(path);
if (r == null) {
return false;
}
Dimension d = getPreferredSize();
r.setSize(new Dimension(d.width, r.height));
if (r.contains(me.getX(), me.getY())) {
if (str == null && System.getProperty("java.version").startsWith("1.7.0")) {
System.out.println("XXX: Java 7, only on first run\n" + getBounds());
setBounds(new Rectangle(0, 0, d.width, r.height));
}
//System.out.println(getBounds());
return true;
}
}
return false;
}
@Override public void updateUI() {
super.updateUI();
setName("Tree.cellEditor");
if (panel != null) {
//panel.removeAll(); //??? Change to Nimbus LnF, JDK 1.6.0
panel.updateUI();
//panel.add(this, BorderLayout.WEST);
}
//???#1: JDK 1.6.0 bug??? @see 1.7.0 DefaultTreeCellRenderer#updateUI()
//if (System.getProperty("java.version").startsWith("1.6.0")) {
// renderer = new DefaultTreeCellRenderer();
//}
}
//Copied from AbstractCellEditor
// protected EventListenerList listenerList = new EventListenerList();
// protected transient ChangeEvent changeEvent;
@Override public boolean shouldSelectCell(EventObject anEvent) {
return true;
}
@Override public boolean stopCellEditing() {
fireEditingStopped();
return true;
}
@Override public void cancelCellEditing() {
fireEditingCanceled();
}
@Override public void addCellEditorListener(CellEditorListener l) {
listenerList.add(CellEditorListener.class, l);
}
@Override public void removeCellEditorListener(CellEditorListener l) {
listenerList.remove(CellEditorListener.class, l);
}
public CellEditorListener[] getCellEditorListeners() {
return listenerList.getListeners(CellEditorListener.class);
}
protected void fireEditingStopped() {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length - 2; i >= 0; i -= 2) {
if (listeners[i] == CellEditorListener.class) {
// Lazily create the event:
if (changeEvent == null) {
changeEvent = new ChangeEvent(this);
}
((CellEditorListener) listeners[i + 1]).editingStopped(changeEvent);
}
}
}
protected void fireEditingCanceled() {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length - 2; i >= 0; i -= 2) {
if (listeners[i] == CellEditorListener.class) {
// Lazily create the event:
if (changeEvent == null) {
changeEvent = new ChangeEvent(this);
}
((CellEditorListener) listeners[i + 1]).editingCanceled(changeEvent);
}
}
}
}
另一方面，我有一个类，它采用目录路径并列出其所有子文件夹和子目录。就这样：
public class FileSystemModel implements TreeModel {
int s = 0;
private File root;
private Vector listeners = new Vector();
public FileSystemModel(File rootDirectory) {
root = rootDirectory;
}
@Override
public Object getRoot() {
return root;
}
@Override
public Object getChild(Object parent, int index) {
File directory = (File) parent;
String[] children = directory.list();
/* for (int j = 0; j< children.length; j++ ){
System.out.println(children[j]);
} */
return new FileSystemModel.TreeFile(directory, children[index]);
}
@Override
public int getChildCount(Object parent) {
File file = (File) parent;
if (file.isDirectory()) {
String[] fileList = file.list();
if (fileList != null) {
return file.list().length;
}
}
return 0;
}
@Override
public boolean isLeaf(Object node) {
File file = (File) node;
return file.isFile();
}
@Override
public int getIndexOfChild(Object parent, Object child) {
File directory = (File) parent;
File file = (File) child;
String[] children = directory.list();
for (int i = 0; i < children.length; i++) {
if (file.getName().equals(children[i])) {
return i;
}
}
return -1;
}
@Override
public void valueForPathChanged(TreePath path, Object value) {
File oldFile = (File) path.getLastPathComponent();
String fileParentPath = oldFile.getParent();
String newFileName = (String) value;
File targetFile = new File(fileParentPath, newFileName);
oldFile.renameTo(targetFile);
File parent = new File(fileParentPath);
int[] changedChildrenIndices = {getIndexOfChild(parent, targetFile)};
Object[] changedChildren = {targetFile};
fireTreeNodesChanged(path.getParentPath(), changedChildrenIndices, changedChildren);
}
private void fireTreeNodesChanged(TreePath parentPath, int[] indices, Object[] children) {
TreeModelEvent event = new TreeModelEvent(this, parentPath, indices, children);
Iterator iterator = listeners.iterator();
TreeModelListener listener = null;
while (iterator.hasNext()) {
listener = (TreeModelListener) iterator.next();
listener.treeNodesChanged(event);
}
}
@Override
public void addTreeModelListener(TreeModelListener listener) {
listeners.add(listener);
}
@Override
public void removeTreeModelListener(TreeModelListener listener) {
listeners.remove(listener);
}
private class TreeFile extends File {
public TreeFile(File parent, String child) {
super(parent, child);
}
@Override
public String toString() {
return getName();
}
}
}
So I am looking for a way to use this implementation for my customised JTree.
This is my attempt that does not compile.
TreeModel model = tree.getModel(new FileSystemModel(new File("C:\\")));
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
Enumeration e = root.breadthFirstEnumeration();
while (e.hasMoreElements()) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) e.nextElement();
Object o = node.getUserObject();
if (o instanceof String) {
node.setUserObject(new CheckBoxNode((String) o, Status.DESELECTED));
}
}
model.addTreeModelListener(new CheckBoxStatusUpdateListener());
我得到的错误：找不到符号TreeModel model = tree.getModel（new FileSystemModel（new File（＆＃34; C：\＆＃34;）））;
如果您需要完整的班级文件，请告诉我。不过我使用了CheckTree和FileSystemModel
是否有任何想法让这个文件系统模型适用于这个JTree？
答案 0 :(得分：1)
TreeModel model = tree.getModel(new FileSystemModel(new File("C:\")));
您正在调用一个不存在的方法。 JTree.getModel()不接受论证。检查Javadoc。这只是一个微不足道的编译器错误。
你应该完全按照你的标题所说的做。