BasicTreeUI.java 文件源码

/**
 * Paints the renderer part of a row. The receiver should NOT modify
 * clipBounds, or insets.
 *
 * @param g - the graphics configuration
 * @param clipBounds -
 * @param insets -
 * @param bounds - bounds of expand control
 * @param path - path to draw control for
 * @param row - row to draw control for
 * @param isExpanded - is the row expanded
 * @param hasBeenExpanded - has the row already been expanded
 * @param isLeaf - is the path a leaf
 */
protected void paintRow(Graphics g, Rectangle clipBounds, Insets insets,
                        Rectangle bounds, TreePath path, int row,
                        boolean isExpanded, boolean hasBeenExpanded,
                        boolean isLeaf)
{
  boolean selected = tree.isPathSelected(path);
  boolean hasIcons = false;
  Object node = path.getLastPathComponent();

  paintExpandControl(g, clipBounds, insets, bounds, path, row, isExpanded,
                     hasBeenExpanded, isLeaf);

  TreeCellRenderer dtcr = currentCellRenderer;

  boolean focused = false;
  if (treeSelectionModel != null)
    focused = treeSelectionModel.getLeadSelectionRow() == row
              && tree.isFocusOwner();

  Component c = dtcr.getTreeCellRendererComponent(tree, node, selected,
                                                  isExpanded, isLeaf, row,
                                                  focused);

  rendererPane.paintComponent(g, c, c.getParent(), bounds);
}