private static void drawSelection(JTree tree, Graphics g, final int width) {
int y = 0;
final int[] rows = tree.getSelectionRows();
final int height = tree.getRowHeight();
for (int row : rows) {
final TreeCellRenderer renderer = tree.getCellRenderer();
final Object value = tree.getPathForRow(row).getLastPathComponent();
if (value == null) continue;
final Component component =
renderer.getTreeCellRendererComponent(tree, value, false, false, false, row, false);
if (component.getFont() == null) {
component.setFont(tree.getFont());
}
g.translate(0, y);
component.setBounds(0, 0, width, height);
boolean wasOpaque = false;
if (component instanceof JComponent) {
final JComponent j = (JComponent) component;
if (j.isOpaque()) wasOpaque = true;
j.setOpaque(false);
}
component.paint(g);
if (wasOpaque) {
((JComponent) component).setOpaque(true);
}
y += height;
g.translate(0, -y);
}
}
private static int getTreeBaseline(JTree tree, int height) {
int rowHeight = tree.getRowHeight();
if (TREE_LABEL == null) {
TREE_LABEL = new JLabel("X");
TREE_LABEL.setIcon(UIManager.getIcon("Tree.closedIcon"));
}
JLabel label = TREE_LABEL;
label.setFont(tree.getFont());
if (rowHeight <= 0) {
rowHeight = label.getPreferredSize().height;
}
return getLabelBaseline(label, rowHeight) + tree.getInsets().top;
}