/**
* Determines whether or not the root node from the TreeModel is visible.
*
* @param rootVisible true if the root node of the tree is to be displayed
* @see #rootVisible
*/
public void setRootVisible(boolean rootVisible) {
if (isRootVisible() != rootVisible) {
super.setRootVisible(rootVisible);
if (root != null) {
if (rootVisible) {
rowCount++;
root.adjustRowBy(1);
} else {
rowCount--;
root.adjustRowBy(-1);
}
visibleNodesChanged();
}
}
}
/**
* Messaged when the node has expanded. This updates all of the receivers children rows, as well
* as the total row count.
*/
protected void didExpand() {
int nextRow = setRowAndChildren(row);
FHTreeStateNode parent = (FHTreeStateNode) getParent();
int childRowCount = nextRow - row - 1;
if (parent != null) {
parent.adjustRowBy(childRowCount, parent.getIndex(this) + 1);
}
adjustRowCountBy(childRowCount);
}
/**
* Adjusts this node, its child, and its parent starting at an index of <code>index</code> index
* is the index of the child to start adjusting from, which is not necessarily the model index.
*/
protected void adjustRowBy(int amount, int startIndex) {
// Could check isVisible, but probably isn't worth it.
if (isExpanded) {
// children following startIndex.
for (int counter = getChildCount() - 1; counter >= startIndex; counter--)
((FHTreeStateNode) getChildAt(counter)).adjustRowBy(amount);
}
// Parent
FHTreeStateNode parent = (FHTreeStateNode) getParent();
if (parent != null) {
parent.adjustRowBy(amount, parent.getIndex(this) + 1);
}
}
