Mega Code Archive
CheckBox Tree node
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import java.awt.Component;
import javax.swing.DefaultCellEditor;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreePath;
class TrueFalseTreeNodeData {
protected final String value;
protected boolean booleanValue;
public TrueFalseTreeNodeData(String quest) {
value = quest;
}
public String getQuestion() {
return value;
}
public boolean getAnswer() {
return booleanValue;
}
public void setAnswer(boolean ans) {
booleanValue = ans;
}
public String toString() {
return value + " = " + booleanValue;
}
}
public class TreeTest extends JFrame {
protected final static String[] questions = { "A","B","C" };
public static void main(String[] args) {
TreeTest tt = new TreeTest();
tt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
tt.setSize(500, 200);
tt.setVisible(true);
}
public TreeTest() {
super();
JTree tree = new JTree(getRootNode()) {
public boolean isPathEditable(TreePath path) {
Object comp = path.getLastPathComponent();
if (comp instanceof DefaultMutableTreeNode) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) comp;
Object userObject = node.getUserObject();
if (userObject instanceof TrueFalseTreeNodeData) {
return true;
}
}
return false;
}
};
QuestionCellRenderer renderer = new QuestionCellRenderer();
tree.setCellRenderer(renderer);
QuestionCellEditor editor = new QuestionCellEditor();
tree.setCellEditor(editor);
tree.setEditable(true);
JScrollPane jsp = new JScrollPane(tree);
getContentPane().add(jsp);
}
protected MutableTreeNode getRootNode() {
DefaultMutableTreeNode root, child;
TrueFalseTreeNodeData question;
root = new DefaultMutableTreeNode("Root");
for (int i = 0; i < questions.length; i++) {
question = new TrueFalseTreeNodeData(questions[i]);
child = new DefaultMutableTreeNode(question);
root.add(child);
}
return root;
}
}
class QuestionCellRenderer extends DefaultTreeCellRenderer {
protected JCheckBox checkBoxRenderer = new JCheckBox();
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row,
boolean hasFocus) {
if (value instanceof DefaultMutableTreeNode) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
Object userObject = node.getUserObject();
if (userObject instanceof TrueFalseTreeNodeData) {
TrueFalseTreeNodeData question = (TrueFalseTreeNodeData) userObject;
prepareQuestionRenderer(question, selected);
return checkBoxRenderer;
}
}
return super.getTreeCellRendererComponent(tree, value, selected, expanded,
leaf, row, hasFocus);
}
protected void prepareQuestionRenderer(TrueFalseTreeNodeData tfq, boolean selected) {
checkBoxRenderer.setText(tfq.getQuestion());
checkBoxRenderer.setSelected(tfq.getAnswer());
if (selected) {
checkBoxRenderer.setForeground(getTextSelectionColor());
checkBoxRenderer.setBackground(getBackgroundSelectionColor());
} else {
checkBoxRenderer.setForeground(getTextNonSelectionColor());
checkBoxRenderer.setBackground(getBackgroundNonSelectionColor());
}
}
}
class QuestionCellEditor extends DefaultCellEditor {
protected TrueFalseTreeNodeData nodeData;
public QuestionCellEditor() {
super(new JCheckBox());
}
public Component getTreeCellEditorComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row) {
JCheckBox editor = null;
nodeData = getQuestionFromValue(value);
if (nodeData != null) {
editor = (JCheckBox) (super.getComponent());
editor.setText(nodeData.getQuestion());
editor.setSelected(nodeData.getAnswer());
}
return editor;
}
public static TrueFalseTreeNodeData getQuestionFromValue(Object value) {
if (value instanceof DefaultMutableTreeNode) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
Object userObject = node.getUserObject();
if (userObject instanceof TrueFalseTreeNodeData) {
return (TrueFalseTreeNodeData) userObject;
}
}
return null;
}
public Object getCellEditorValue() {
JCheckBox editor = (JCheckBox) (super.getComponent());
nodeData.setAnswer(editor.isSelected());
return nodeData;
}
}
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