toolkit/test/accessibility/AccessibleTreeCellRenderer.java

   1 import javax.swing.tree.DefaultTreeCellRenderer;
   2 import javax.swing.tree.TreePath;
   3 import javax.swing.JTree;
   4 import java.awt.Color;
   5 import java.awt.Component;
   6 import java.util.Vector;
   7
   8
   9 public class AccessibleTreeCellRenderer
  10     extends DefaultTreeCellRenderer
  11 {
  12     public Color
  13         maDefaultColor,
  14         maChangedColor;
  15     protected Vector
  16         maChangedLines;
  17
  18
  19
  20     public AccessibleTreeCellRenderer ()
  21     {
  22         maDefaultColor = Color.black;
  23         maChangedColor = Color.red;
  24         maChangedLines = new Vector ();
  25     }
  26
  27     public Component getTreeCellRendererComponent (
  28         JTree tree,
  29         Object value,
  30         boolean sel,
  31         boolean expanded,
  32         boolean leaf,
  33         int row,
  34         boolean hasFocus)
  35     {
  36         super.getTreeCellRendererComponent(
  37             tree, value, sel,
  38             expanded, leaf, row,
  39             hasFocus);
  40
  41         if (maChangedLines.size()<=row || maChangedLines.elementAt (row) == null)
  42             setTextNonSelectionColor (maDefaultColor);
  43         else
  44             setTextNonSelectionColor (maChangedColor);
  45
  46         return this;
  47     }
  48
  49     /** Tell the cell renderer that no changes shall be displayed anymore.
  50     */
  51     public void clearAllChanges ()
  52     {
  53         maChangedLines.clear();
  54     }
  55
  56     /** Inform the cell renderer of a new changed line which to paint
  57         highlighted when asked to paint it the next time.
  58     */
  59     public void addChangedLine (int nRow)
  60     {
  61         if (maChangedLines.size() <= nRow)
  62             maChangedLines.setSize (nRow+1);
  63         nRow -= 1; // row index is one to large for some reason.
  64         maChangedLines.set (nRow, new Boolean (true));
  65     }
  66
  67     /** Inform the cell renderer of a set of changed line which to paint
  68         highlighted when asked to paint them the next time.
  69         @param aChangedNodes
  70             The set of changed nodes.  Each entry is a TreePath.
  71         @param aTree
  72             The JTree that is used to transform the given TreePath objects
  73             into rows.
  74     */
  75     public void addChangedNodes (Vector aChangedNodes, JTree aTree)
  76     {
  77         for (int i=0; i<aChangedNodes.size(); i++)
  78         {
  79             TreePath aPath = (TreePath)aChangedNodes.elementAt (i);
  80             int nRow = aTree.getRowForPath (aPath);
  81             addChangedLine (nRow);
  82         }
  83     }
  84
  85 }
  86