I would like to know how I could do to start the class already with all checkboxes checked, I found this class and I used:
package CustonComponents;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.EventListener;
import java.util.EventObject;
import java.util.HashMap;
import java.util.HashSet;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.JTree;
import javax.swing.event.EventListenerList;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeSelectionModel;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
public class JCheckBoxTree extends JTree {
private static final long serialVersionUID = -4194122328392241790L;
JCheckBoxTree selfPointer = this;
// Defining data structure that will enable to fast check-indicate the state of each node
// It totally replaces the "selection" mechanism of the JTree
private class CheckedNode {
boolean isSelected;
boolean hasChildren;
boolean allChildrenSelected;
public CheckedNode(boolean isSelected_, boolean hasChildren_, boolean allChildrenSelected_) {
isSelected = isSelected_;
hasChildren = hasChildren_;
allChildrenSelected = allChildrenSelected_;
}
}
HashMap<TreePath, CheckedNode> nodesCheckingState;
HashSet<TreePath> checkedPaths = new HashSet<TreePath>();
// Defining a new event type for the checking mechanism and preparing event-handling mechanism
protected EventListenerList listenerList = new EventListenerList();
public class CheckChangeEvent extends EventObject {
private static final long serialVersionUID = -8100230309044193368L;
public CheckChangeEvent(Object source) {
super(source);
}
}
public interface CheckChangeEventListener extends EventListener {
public void checkStateChanged(CheckChangeEvent event);
}
public void addCheckChangeEventListener(CheckChangeEventListener listener) {
listenerList.add(CheckChangeEventListener.class, listener);
}
public void removeCheckChangeEventListener(CheckChangeEventListener listener) {
listenerList.remove(CheckChangeEventListener.class, listener);
}
void fireCheckChangeEvent(CheckChangeEvent evt) {
Object[] listeners = listenerList.getListenerList();
for (int i = 0; i < listeners.length; i++) {
if (listeners[i] == CheckChangeEventListener.class) {
((CheckChangeEventListener) listeners[i + 1]).checkStateChanged(evt);
}
}
}
// Override
public void setModel(TreeModel newModel) {
super.setModel(newModel);
resetCheckingState();
}
// New method that returns only the checked paths (totally ignores original "selection" mechanism)
public TreePath[] getCheckedPaths() {
return checkedPaths.toArray(new TreePath[checkedPaths.size()]);
}
// Returns true in case that the node is selected, has children but not all of them are selected
public boolean isSelectedPartially(TreePath path) {
CheckedNode cn = nodesCheckingState.get(path);
return cn.isSelected && cn.hasChildren && !cn.allChildrenSelected;
}
private void resetCheckingState() {
nodesCheckingState = new HashMap<TreePath, CheckedNode>();
checkedPaths = new HashSet<TreePath>();
DefaultMutableTreeNode node = (DefaultMutableTreeNode) getModel().getRoot();
if (node == null) {
return;
}
addSubtreeToCheckingStateTracking(node);
}
// Creating data structure of the current model for the checking mechanism
private void addSubtreeToCheckingStateTracking(DefaultMutableTreeNode node) {
TreeNode[] path = node.getPath();
TreePath tp = new TreePath(path);
CheckedNode cn = new CheckedNode(false, node.getChildCount() > 0, false);
nodesCheckingState.put(tp, cn);
for (int i = 0; i < node.getChildCount(); i++) {
addSubtreeToCheckingStateTracking((DefaultMutableTreeNode) tp.pathByAddingChild(node.getChildAt(i)).getLastPathComponent());
}
}
// Overriding cell renderer by a class that ignores the original "selection" mechanism
// It decides how to show the nodes due to the checking-mechanism
private class CheckBoxCellRenderer extends JPanel implements TreeCellRenderer {
private static final long serialVersionUID = -7341833835878991719L;
JCheckBox checkBox;
public CheckBoxCellRenderer() {
super();
this.setLayout(new BorderLayout());
checkBox = new JCheckBox();
add(checkBox, BorderLayout.CENTER);
setOpaque(false);
}
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
Object obj = node.getUserObject();
TreePath tp = new TreePath(node.getPath());
CheckedNode cn = nodesCheckingState.get(tp);
if (cn == null) {
return this;
}
checkBox.setSelected(cn.isSelected);
checkBox.setText(obj.toString());
checkBox.setOpaque(cn.isSelected && cn.hasChildren && !cn.allChildrenSelected);
return this;
}
}
public JCheckBoxTree() {
super();
// Disabling toggling by double-click
this.setToggleClickCount(0);
// Overriding cell renderer by new one defined above
CheckBoxCellRenderer cellRenderer = new CheckBoxCellRenderer();
this.setCellRenderer(cellRenderer);
// Overriding selection model by an empty one
DefaultTreeSelectionModel dtsm = new DefaultTreeSelectionModel() {
private static final long serialVersionUID = -8190634240451667286L;
// Totally disabling the selection mechanism
public void setSelectionPath(TreePath path) {
}
public void addSelectionPath(TreePath path) {
}
public void removeSelectionPath(TreePath path) {
}
public void setSelectionPaths(TreePath[] pPaths) {
}
};
// Calling checking mechanism on mouse click
this.addMouseListener(new MouseListener() {
public void mouseClicked(MouseEvent arg0) {
TreePath tp = selfPointer.getPathForLocation(arg0.getX(), arg0.getY());
if (tp == null) {
return;
}
boolean checkMode = !nodesCheckingState.get(tp).isSelected;
checkSubTree(tp, checkMode);
updatePredecessorsWithCheckMode(tp, checkMode);
// Firing the check change event
fireCheckChangeEvent(new CheckChangeEvent(new Object()));
// Repainting tree after the data structures were updated
selfPointer.repaint();
}
public void mouseEntered(MouseEvent arg0) {
}
public void mouseExited(MouseEvent arg0) {
}
public void mousePressed(MouseEvent arg0) {
}
public void mouseReleased(MouseEvent arg0) {
}
});
this.setSelectionModel(dtsm);
}
// When a node is checked/unchecked, updating the states of the predecessors
protected void updatePredecessorsWithCheckMode(TreePath tp, boolean check) {
TreePath parentPath = tp.getParentPath();
// If it is the root, stop the recursive calls and return
if (parentPath == null) {
return;
}
CheckedNode parentCheckedNode = nodesCheckingState.get(parentPath);
DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) parentPath.getLastPathComponent();
parentCheckedNode.allChildrenSelected = true;
parentCheckedNode.isSelected = false;
for (int i = 0; i < parentNode.getChildCount(); i++) {
TreePath childPath = parentPath.pathByAddingChild(parentNode.getChildAt(i));
CheckedNode childCheckedNode = nodesCheckingState.get(childPath);
// It is enough that even one subtree is not fully selected
// to determine that the parent is not fully selected
if (!childCheckedNode.allChildrenSelected) {
parentCheckedNode.allChildrenSelected = false;
}
// If at least one child is selected, selecting also the parent
if (childCheckedNode.isSelected) {
parentCheckedNode.isSelected = true;
}
}
if (parentCheckedNode.isSelected) {
checkedPaths.add(parentPath);
} else {
checkedPaths.remove(parentPath);
}
// Go to upper predecessor
updatePredecessorsWithCheckMode(parentPath, check);
}
// Recursively checks/unchecks a subtree
protected void checkSubTree(TreePath tp, boolean check) {
CheckedNode cn = nodesCheckingState.get(tp);
cn.isSelected = check;
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tp.getLastPathComponent();
for (int i = 0; i < node.getChildCount(); i++) {
checkSubTree(tp.pathByAddingChild(node.getChildAt(i)), check);
}
cn.allChildrenSelected = check;
if (check) {
checkedPaths.add(tp);
} else {
checkedPaths.remove(tp);
}
}
}
Test Class
package checkboxtree;
public class NovoJFrame extends javax.swing.JFrame {
public NovoJFrame() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jCheckBoxTree1 = new CustonComponents.JCheckBoxTree();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jScrollPane1.setViewportView(jCheckBoxTree1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 152, javax.swing.GroupLayout.PREFERRED_SIZE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 245, javax.swing.GroupLayout.PREFERRED_SIZE)
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(NovoJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NovoJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NovoJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NovoJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NovoJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private CustonComponents.JCheckBoxTree jCheckBoxTree1;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration
}
I would like all classes to be started when I initialize the class !!