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import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreePath;
import javax.swing.JTree;
import java.awt.Color;
import java.awt.Component;
import java.util.Vector;
public class AccessibleTreeCellRenderer
extends DefaultTreeCellRenderer
{
public Color
maDefaultColor,
maChangedColor;
protected Vector
maChangedLines;
public AccessibleTreeCellRenderer ()
{
maDefaultColor = Color.black;
maChangedColor = Color.red;
maChangedLines = new Vector ();
}
public Component getTreeCellRendererComponent (
JTree tree,
Object value,
boolean sel,
boolean expanded,
boolean leaf,
int row,
boolean hasFocus)
{
super.getTreeCellRendererComponent(
tree, value, sel,
expanded, leaf, row,
hasFocus);
if (maChangedLines.size()<=row || maChangedLines.elementAt (row) == null)
setTextNonSelectionColor (maDefaultColor);
else
setTextNonSelectionColor (maChangedColor);
return this;
}
/** Tell the cell renderer that no changes shall be displayed anymore.
*/
public void clearAllChanges ()
{
maChangedLines.clear();
}
/** Inform the cell renderer of a new changed line which to paint
highlighted when asked to paint it the next time.
*/
public void addChangedLine (int nRow)
{
if (maChangedLines.size() <= nRow)
maChangedLines.setSize (nRow+1);
nRow -= 1; // row index is one to large for some reason.
maChangedLines.set (nRow, new Boolean (true));
}
/** Inform the cell renderer of a set of changed line which to paint
highlighted when asked to paint them the next time.
@param aChangedNodes
The set of changed nodes. Each entry is a TreePath.
@param aTree
The JTree that is used to transform the given TreePath objects
into rows.
*/
public void addChangedNodes (Vector aChangedNodes, JTree aTree)
{
for (int i=0; i<aChangedNodes.size(); i++)
{
TreePath aPath = (TreePath)aChangedNodes.elementAt (i);
int nRow = aTree.getRowForPath (aPath);
addChangedLine (nRow);
}
}
}
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