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// *** HideableMutableTreeNode ***
import javax.swing.*;
import javax.swing.tree.*;
/**
* <code>HideableMutableTreeNode</code> is a <code>DefaultMutableTreeNode</code>
* implementation that works with <code>HideableTreeModel</code>.
*/
public class HideableMutableTreeNode extends DefaultMutableTreeNode {
/**
* The node is visible flag.
*/
public boolean bIsvisible = true;
private static final String SDUMMY = "Dummy";
/**
* Creates a tree node that has no parent and no children, but which
* allows children.
*/
public HideableMutableTreeNode() {
super();
}
/**
* Creates a tree node with no parent, no children, but which allows
* children, and initializes it with the specified user object.
*
* @param userObject - an Object provided by the user that
* constitutes the node's data
*/
public HideableMutableTreeNode(Object _userObject) {
super(_userObject);
}
/**
* Creates a tree node with no parent, no children, initialized with the
* specified user object, and that allows children only if specified.
*
* @param _userObject - an Object provided by the user that describes the node's data
* @param _ballowsChildren - if true, the node is allowed to have childnodes -- otherwise, it is always a leaf node
*/
public HideableMutableTreeNode(Object _userObject, boolean _ballowsChildren) {
super(_userObject, _ballowsChildren);
}
/**
* Checks if the node is visible.
*
* @return true if the node is visible, else false
*/
public boolean isVisible() {
return this.bIsvisible;
}
/**
* Sets if the node is visible.
*
* @param returns true if the node is visible, else false
*/
public void setVisible(boolean _bIsVisible) {
this.bIsvisible = _bIsVisible;
}
public void addDummyNode(){
removeDummyNode();
DefaultMutableTreeNode oDefaultMutableTreeNode = new DefaultMutableTreeNode(SDUMMY);
add(oDefaultMutableTreeNode);
}
public boolean removeDummyNode(){
boolean breturn = false;
if (getChildCount() == 1){
DefaultMutableTreeNode oDefaultMutableTreeNode = (DefaultMutableTreeNode) getChildAt(0);
if (oDefaultMutableTreeNode != null){
if (oDefaultMutableTreeNode.getUserObject().equals(SDUMMY)){
remove(0);
breturn = true;
}
}
}
return breturn;
}
}
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