gistfile1.java

public class BrushListDialog extends JDialog {
	
	// ...
	
	private static class BrushListCellRenderer extends DefaultListCellRenderer {
		private static final Color BG = new Color(0xFFFFF0);
		private static final Color BG_SELECTED = new Color(0x39697B);
		
		@Override
		public Component getListCellRendererComponent(JList<?> list, Object value, int index,
				boolean isSelected, boolean cellHasFocus) {
			Component comp = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
			if (!TYPES.contains(value)) {
				comp.setBackground(isSelected ? BG_SELECTED : BG);
			}
			return comp;
		}
	}
	
	private class BrushListModel extends DefaultListModel<String> {
		@Override
		public void addElement(String elem) {
			elem = formatClassName(elem);
			if (!contains(elem) && !elem.matches("|worldspawn")) {
				super.addElement(elem);
			}
		}
		
		@Override
		public boolean removeElement(Object elem) {
			if (TYPES.contains(elem) && !showRemoveConfirmDialog(elem)) {
				return false;
			}
			return super.removeElement(elem);
		}
		
		@Override
		public int indexOf(Object elem) {
			return super.indexOf(formatClassName((String) elem));
		}
		
		private String formatClassName(String elem) {
			return elem.trim().toLowerCase().replace(' ', '_').replaceAll("[^\\w]", "");
		}
		
		private boolean showRemoveConfirmDialog(Object elem) {
			int option = JOptionPane.showConfirmDialog(BrushListDialog.this,
					elem + " is a default brush type.\nDo you want to allow the removal of such entries?",
					"Remove", JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE);
			if (option == JOptionPane.YES_OPTION) {
				TYPES.clear();
				return true;
			}
			return false;
		}
	}
}