path: root/base/src/main/java/bjc/utils/gui/browser/JBrowser.java

package bjc.utils.gui.browser;

// JBrowser.java
// NSBrowser-style column browser for Swing with:
// - Per-column headers (model-driven)
// - In-place filtering per column
// - Reserved, headered blank columns that are consumed before adding new columns
// - Columns arranged in a resizable JSplitPane chain (horizontal)

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.event.*;
import javax.swing.tree.TreePath;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class JBrowser extends JComponent {

	// --- Public API ---

	public JBrowser(JBrowserModel model) {
		setLayout(new BorderLayout());
		this.model = model;

		// Viewport that can scroll horizontally if many columns
		scrollPane = new JScrollPane(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER,
				ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
		scrollPane.getHorizontalScrollBar().setUnitIncrement(24);
		add(scrollPane, BorderLayout.CENTER);

		setCellRenderer(new DefaultBrowserRenderer(model));
		setFocusable(true);
		setFocusTraversalKeysEnabled(false);

		installKeyBindings();

		// default: "contains" on model text, case-insensitive
		this.filterer = (node, q, m) -> {
			if (q == null || q.isEmpty())
				return true;
			String text = m.getText(node);
			return text != null && text.toLowerCase().contains(q);
		};

		// default blank header provider: "Level N" (1-based)
		this.blankHeaderProvider = (depth, ord, m) -> "Level " + (depth + 1);

		setRoot(model != null ? model.getRoot() : null);
	}

	public void setModel(JBrowserModel model) {
		this.model = model;
		if (cellRenderer instanceof DefaultBrowserRenderer) {
			((DefaultBrowserRenderer) cellRenderer).setModel(model);
		}
		setRoot(model != null ? model.getRoot() : null);
	}

	public JBrowserModel getModel() {
		return model;
	}

	/** Sets the logical root and rebuilds columns to show root's children. */
	public void setRoot(Object root) {
		this.root = root;
		rebuildColumnsForRoot();
	}

	public Object getRoot() {
		return root;
	}

	/** Column width (px). */
	public void setColumnWidth(int width) {
		this.columnWidth = Math.max(80, width);
		for (Column c : columns)
			c.applyWidth();
		rebuildSplitChain(); // also updates blanks
	}

	public int getColumnWidth() {
		return columnWidth;
	}

	/**
	 * Show/hide headers (label + optional filter) above each real column and
	 * blanks.
	 */
	public void setHeadersVisible(boolean visible) {
		this.headersVisible = visible;
		for (Column c : columns)
			c.applyHeaderVisibility(headersVisible, filteringEnabled);
		rebuildSplitChain(); // rebuild blanks with/without headers
	}

	public boolean isHeadersVisible() {
		return headersVisible;
	}

	/** Enable/disable in-place filtering UI globally (real columns only). */
	public void setFilteringEnabled(boolean enabled) {
		this.filteringEnabled = enabled;
		for (Column c : columns)
			c.applyHeaderVisibility(headersVisible, filteringEnabled);
		// no rebuild needed
	}

	public boolean isFilteringEnabled() {
		return filteringEnabled;
	}

	/**
	 * Set how many blank columns to keep visible at the end. These blanks are
	 * consumed (visually replaced by real columns) as you drill down; only when you
	 * exceed this depth will new columns be added.
	 */
	public void setReservedBlankColumns(int count) {
		this.reservedBlankColumns = Math.max(0, count);
		rebuildSplitChain();
	}

	public int getReservedBlankColumns() {
		return reservedBlankColumns;
	}

	/** Provide header text for blank columns. */
	public void setBlankHeaderProvider(BlankHeaderProvider provider) {
		this.blankHeaderProvider = (provider != null) ? provider : this.blankHeaderProvider;
		rebuildSplitChain();
	}

	/** Set custom cell renderer for list rows. */
	public void setCellRenderer(ListCellRenderer<? super Object> r) {
		this.cellRenderer = r != null ? r : new DefaultBrowserRenderer(model);
		for (Column c : columns)
			c.list.setCellRenderer(this.cellRenderer);
	}

	/** Provide a custom filterer (e.g., regex, fuzzy). */
	public void setFilterer(BrowserFilterer filterer) {
		this.filterer = (filterer != null) ? filterer : this.filterer;
		for (Column c : columns)
			c.refilter();
	}

	/** Returns the current selection path (may be null or length 0). */
	public TreePath getSelectionPath() {
		List<Object> comps = new ArrayList<>();
		if (root != null)
			comps.add(root);
		for (Column c : columns) {
			Object sel = c.list.getSelectedValue();
			if (sel == null)
				break;
			comps.add(sel);
		}
		return comps.isEmpty() ? null : new TreePath(comps.toArray());
	}

	/**
	 * Programmatically select a path (root..node); consumes blanks before adding
	 * new columns.
	 */
	public void setSelectionPath(TreePath path) {
		if (model == null || root == null || path == null)
			return;
		rebuildFromPath(path);
		fireSelectionChanged();
		ensureLastColumnVisible();
	}

	/** Clear selection starting from a given column index (inclusive). */
	public void clearFromColumn(int columnIndex) {
		for (int i = columnIndex; i < columns.size(); i++)
			columns.get(i).list.clearSelection();
		trimRealColumns(columnIndex + 1);
		fireSelectionChanged();
	}

	public void addSelectionListener(BrowserSelectionListener l) {
		listenerList.add(BrowserSelectionListener.class, l);
	}

	public void removeSelectionListener(BrowserSelectionListener l) {
		listenerList.remove(BrowserSelectionListener.class, l);
	}

	/** Reloads current column data (e.g., after external model changes). */
	public void reload() {
		TreePath path = getSelectionPath();
		rebuildFromPath(path);
	}

	/** Optional public helper if you ever want to clear saved widths manually. */
	public void clearSavedDividerState() {
		savedLeafWidths = null;
	}

	// --- Internals ---

	private JBrowserModel model;
	private Object root;
	private final JScrollPane scrollPane;
	private Component splitRoot; // either a JSplitPane chain or a single column component
	private final List<Column> columns = new ArrayList<>();
	private int columnWidth = 240;

	private boolean headersVisible = true;
	private boolean filteringEnabled = true;
	private BrowserFilterer filterer;

	/** Number of blank columns to keep at the end at all times. */
	private int reservedBlankColumns = 0;
	private BlankHeaderProvider blankHeaderProvider;

	private ListCellRenderer<? super Object> cellRenderer;

	// --- Divider state memory ---
	private java.util.List<Integer> savedLeafWidths; // widths of leaf panes, left->right

	private void rebuildColumnsForRoot() {
		columns.clear();
		if (model == null || root == null) {
			setSplitRoot(new JPanel());
			return;
		}
		// First real column shows children of root
		addRealColumn(root, 0);
		rebuildSplitChain();
		ensureLastColumnVisible();
	}

	private void rebuildFromPath(TreePath path) {
		columns.clear();

		if (model == null || root == null) {
			setSplitRoot(new JPanel());
			return;
		}

		Object parent = root;
		addRealColumn(parent, 0);

		if (path != null) {
			Object[] comps = path.getPath();
			for (int depth = 1; depth < comps.length; depth++) {
				Object node = comps[depth];
				Column prev = columns.get(columns.size() - 1);
				prev.selectNode(node);

				if (!model.isLeaf(node)) {
					addRealColumn(node, depth);
					parent = node;
				} else {
					parent = node;
					break;
				}
			}
		}

		rebuildSplitChain();
		ensureLastColumnVisible();
	}

	/**
	 * Adds a populated column for parentNode (logical append; blanks handled by
	 * rebuildSplitChain).
	 */
	private void addRealColumn(Object parentNode, int depth) {
		Column c = new Column(parentNode, depth);
		columns.add(c);
	}

	/** Remove real columns after 'keep'. */
	private void trimRealColumns(int keep) {
		for (int i = columns.size() - 1; i >= keep; i--) {
			columns.remove(i);
		}
		rebuildSplitChain();
	}

	private void onColumnSelectionChanged(Column source) {
		int colIndex = columns.indexOf(source);
		if (colIndex < 0)
			return;

		trimRealColumns(colIndex + 1);

		Object selected = source.list.getSelectedValue();
		if (selected != null && !model.isLeaf(selected)) {
			addRealColumn(selected, colIndex + 1);
		}
		rebuildSplitChain();
		fireSelectionChanged();
		ensureLastColumnVisible();
	}

	private void fireSelectionChanged() {
		TreePath path = getSelectionPath();
		for (BrowserSelectionListener l : listenerList.getListeners(BrowserSelectionListener.class)) {
			l.selectionPathChanged(path);
		}
	}

	// ----- Split chain (JSplitPane) management -----

	/**
	 * Rebuild the JSplitPane chain so blanks are *consumed* before new panes
	 * appear.
	 */
	private void rebuildSplitChain() {
		// Snapshot current divider state (if we already have a split chain shown)
		snapshotDividerState();

		int real = columns.size();
		// Show fewer blanks as you go deeper: consume one blank per extra real column
		// past the first
		int blanksToShow = Math.max(0, reservedBlankColumns - Math.max(0, real - 1));

		// Build: [real columns] + [remaining blanks]
		List<Component> comps = new ArrayList<>(real + blanksToShow);
		for (Column c : columns)
			comps.add(c.wrapper);

		int startDepth = real; // depth of the next column to the right of the last real one
		for (int i = 0; i < blanksToShow; i++) {
			String headerText = headersVisible ? safeHeaderText(startDepth + i, i) : null;
			comps.add(new ReservedBlank(columnWidth, headerText, headersVisible));
		}

		Component newRoot = buildSplitChain(comps);
		setSplitRoot(newRoot);

		// Make initial layout tidy; users can resize afterward.
		SwingUtilities.invokeLater(() -> restoreOrNormalizeDividerLocations(newRoot));
	}

	// ----- Divider state memory helpers -----

	private void snapshotDividerState() {
		if (splitRoot == null) {
			savedLeafWidths = null;
			return;
		}
		java.util.List<Integer> widths = new java.util.ArrayList<>();
		collectLeafWidths(splitRoot, widths);
		// Only save if we actually found leaves
		savedLeafWidths = widths.isEmpty() ? null : widths;
	}

	/**
	 * Collect widths (pixels) of each leaf (non-JSplitPane) component, left->right.
	 */
	private void collectLeafWidths(Component node, java.util.List<Integer> out) {
		if (node == null)
			return;
		if (node instanceof JSplitPane) {
			JSplitPane sp = (JSplitPane) node;
			collectLeafWidths(sp.getLeftComponent(), out);
			collectLeafWidths(sp.getRightComponent(), out);
		} else {
			int w = node.getWidth();
			if (w <= 0) {
				Dimension d = node.getPreferredSize();
				w = (d != null && d.width > 0) ? d.width : columnWidth;
			}
			out.add(w);
		}
	}

	/**
	 * Try to restore previous divider positions; fallback to preferred-width
	 * normalization.
	 */
	private void restoreOrNormalizeDividerLocations(Component root) {
		if (savedLeafWidths == null || savedLeafWidths.isEmpty()) {
			normalizeDividerLocations(root);
			return;
		}
		// Build desired widths list sized to the current number of leaves
		int leafCount = countLeaves(root);
		java.util.List<Integer> desired = new java.util.ArrayList<>(leafCount);
		for (int i = 0; i < leafCount; i++) {
			int w = (i < savedLeafWidths.size()) ? savedLeafWidths.get(i) : columnWidth;
			desired.add(Math.max(1, w));
		}
		// Assign divider locations by summing desired widths of left subtrees
		setDividersByDesiredLeafWidths(root, desired, new int[] { 0 });
	}

	/** Count leaves (non-JSplitPane components). */
	private int countLeaves(Component node) {
		if (node == null)
			return 0;
		if (node instanceof JSplitPane) {
			JSplitPane sp = (JSplitPane) node;
			return countLeaves(sp.getLeftComponent()) + countLeaves(sp.getRightComponent());
		}
		return 1;
	}

	/**
	 * Set dividers so each JSplitPane's divider equals the total width of its left
	 * subtree.
	 */
	private int setDividersByDesiredLeafWidths(Component node, java.util.List<Integer> desired, int[] idxRef) {
		if (node == null)
			return 0;
		if (!(node instanceof JSplitPane)) {
			int w = desired.get(Math.min(idxRef[0], desired.size() - 1));
			idxRef[0] = Math.min(idxRef[0] + 1, desired.size());
			return w;
		}
		JSplitPane sp = (JSplitPane) node;
		int leftSum = setDividersByDesiredLeafWidths(sp.getLeftComponent(), desired, idxRef);
		int rightSum = setDividersByDesiredLeafWidths(sp.getRightComponent(), desired, idxRef);
		sp.setDividerLocation(leftSum);
		return leftSum + rightSum;
	}

	private Component buildSplitChain(List<Component> comps) {
		if (comps.isEmpty())
			return new JPanel();
		if (comps.size() == 1)
			return comps.get(0);

		Component left = comps.get(0);
		for (int i = 1; i < comps.size(); i++) {
			JSplitPane sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, left, comps.get(i));
			sp.setContinuousLayout(true);
			sp.setDividerSize(6);
			sp.setResizeWeight(0.0); // new column tends to take its preferred width
			left = sp;
		}
		return left;
	}

	private void setSplitRoot(Component root) {
		this.splitRoot = root;
		scrollPane.setViewportView(splitRoot);
		splitRoot.revalidate();
		splitRoot.repaint();
	}

	private void normalizeDividerLocations(Component root) {
		if (!(root instanceof JSplitPane))
			return;
		JSplitPane sp = (JSplitPane) root;

		// Recurse first so children's preferred sizes settle
		normalizeDividerLocations(sp.getLeftComponent());
		normalizeDividerLocations(sp.getRightComponent());

		int leftW = preferredWidth(sp.getLeftComponent());
		sp.setDividerLocation(leftW);
	}

	private int preferredWidth(Component c) {
		if (c == null)
			return 0; // <-- fixes your NPE
		if (c instanceof JSplitPane) {
			JSplitPane sp = (JSplitPane) c;
			return preferredWidth(sp.getLeftComponent()) + preferredWidth(sp.getRightComponent());
		}
		Dimension d = c.getPreferredSize();
		return (d != null && d.width > 0) ? d.width : columnWidth;
	}

	private String safeHeaderText(int depthFromRoot, int blankOrdinal) {
		if (blankHeaderProvider == null)
			return null;
		String s = blankHeaderProvider.getBlankHeader(depthFromRoot, blankOrdinal, model);
		return (s == null || s.isEmpty()) ? null : s;
	}

	private void ensureLastColumnVisible() {
		if (splitRoot == null)
			return;
		// Scroll to the far right edge
		Dimension pref = splitRoot.getPreferredSize();
		Rectangle r = new Rectangle(pref.width - 1, 0, 1, 1);
		((JComponent) splitRoot).scrollRectToVisible(r);
	}

	private void installKeyBindings() {
		InputMap im = getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
		ActionMap am = getActionMap();

		im.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), "browser.forward");
		im.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), "browser.back");
		im.put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), "browser.clear");

		am.put("browser.forward", new AbstractAction() {
			private static final long serialVersionUID = -4565623511130359777L;

			@Override
			public void actionPerformed(ActionEvent e) {
				Column focusCol = columnWithFocus();
				if (focusCol == null)
					return;
				Object sel = focusCol.list.getSelectedValue();
				if (sel != null && !model.isLeaf(sel)) {
					onColumnSelectionChanged(focusCol); // adds next column
					int nextIdx = columns.indexOf(focusCol) + 1;
					if (nextIdx < columns.size()) {
						Column next = columns.get(nextIdx);
						if (next.list.getModel().getSize() > 0)
							next.list.setSelectedIndex(0);
						next.list.requestFocusInWindow();
					}
				}
			}
		});

		am.put("browser.back", new AbstractAction() {
			/**
			 * 
			 */
			private static final long serialVersionUID = -8414068311354454006L;

			@Override
			public void actionPerformed(ActionEvent e) {
				Column focusCol = columnWithFocus();
				if (focusCol == null)
					return;
				int idx = columns.indexOf(focusCol);
				if (idx > 0) {
					Column prev = columns.get(idx - 1);
					prev.list.requestFocusInWindow();
				} else {
					focusCol.list.clearSelection();
				}
			}
		});

		am.put("browser.clear", new AbstractAction() {
			@Override
			public void actionPerformed(ActionEvent e) {
				Column focusCol = columnWithFocus();
				if (focusCol == null)
					return;
				int idx = columns.indexOf(focusCol);
				clearFromColumn(idx);
			}
		});
	}

	private Column columnWithFocus() {
		for (Column c : columns)
			if (c.list.isFocusOwner())
				return c;
		if (!columns.isEmpty())
			return columns.get(0);
		return null;
	}

	// ---------- Inner types ----------

	/** Column wrapper: header (label + filter) + list in a scrollpane. */
	private class Column {
		final Object parentNode;
		final int depth;
		final JPanel wrapper;
		final JLabel headerLabel;
		final JTextField filterField;
		final JList<Object> list;
		final JScrollPane scroll;
		final ChildrenListModel baseModel;
		final FilteringListModel filteringModel;

		Column(Object parentNode, int depth) {
			this.parentNode = parentNode;
			this.depth = depth;

			baseModel = new ChildrenListModel(model, parentNode);
			filteringModel = new FilteringListModel(baseModel);

			list = new JList<>(filteringModel);
			list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
			list.setCellRenderer(cellRenderer);
			list.setVisibleRowCount(-1);
			list.addListSelectionListener(e -> {
				if (!e.getValueIsAdjusting())
					onColumnSelectionChanged(this);
			});
			list.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), "none");
			list.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), "none");

			scroll = new JScrollPane(list, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
					ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

			JPanel header = new JPanel(new BorderLayout(6, 2));
			header.setBorder(new EmptyBorder(4, 6, 4, 6));
			headerLabel = new JLabel(model.getColumnHeader(parentNode, depth));
			headerLabel.setFont(headerLabel.getFont().deriveFont(Font.BOLD));
			filterField = new JTextField();
			filterField.putClientProperty("JComponent.sizeVariant", "small");
			filterField.setToolTipText("Filter…");
			filterField.getDocument().addDocumentListener(new DocumentListener() {
				@Override
				public void insertUpdate(DocumentEvent e) {
					refilter();
				}

				@Override
				public void removeUpdate(DocumentEvent e) {
					refilter();
				}

				@Override
				public void changedUpdate(DocumentEvent e) {
					refilter();
				}
			});
			header.add(headerLabel, BorderLayout.NORTH);
			header.add(filterField, BorderLayout.SOUTH);
			scroll.setColumnHeaderView(header);

			wrapper = new JPanel(new BorderLayout());
			wrapper.add(scroll, BorderLayout.CENTER);

			applyWidth();
			applyHeaderVisibility(headersVisible, filteringEnabled);
		}

		void applyWidth() {
			Dimension d = new Dimension(columnWidth, 300);
			list.setFixedCellWidth(columnWidth - 18);
			scroll.setPreferredSize(d);
			scroll.setMinimumSize(new Dimension(columnWidth, 120));
			scroll.setMaximumSize(new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE));
			wrapper.setPreferredSize(d);
			wrapper.setMinimumSize(new Dimension(columnWidth, 120));
		}

		void applyHeaderVisibility(boolean headers, boolean filtering) {
			Component header = (scroll.getColumnHeader() != null) ? scroll.getColumnHeader().getView() : null;
			if (header != null)
				header.setVisible(headers);
			filterField.setVisible(headers && filtering);
		}

		void refilter() {
			String q = filterField.getText();
			filteringModel.setQuery(q, filterer, model);
			Object sel = list.getSelectedValue();
			if (sel != null && filteringModel.indexOf(sel) < 0) {
				list.clearSelection();
			}
		}

		void selectNode(Object node) {
			int idx = filteringModel.indexOf(node);
			if (idx >= 0)
				list.setSelectedIndex(idx);
		}
	}

	/**
	 * Visual blank column kept at the end; shows a header via BlankHeaderProvider.
	 */
	private static class ReservedBlank extends JPanel {
		ReservedBlank(int width, String headerText, boolean headersVisible) {
			super(new BorderLayout());
			setOpaque(true);

			// Header
			JPanel header = new JPanel(new BorderLayout(6, 2));
			header.setBorder(new EmptyBorder(4, 6, 4, 6));
			JLabel headerLabel = new JLabel((headerText != null) ? headerText : " ");
			headerLabel.setFont(headerLabel.getFont().deriveFont(Font.BOLD));
			header.add(headerLabel, BorderLayout.NORTH);
			header.setVisible(headersVisible && headerText != null);

			// Center (empty scroll to visually match real columns)
			JScrollPane body = new JScrollPane(new JPanel(), ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,
					ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

			add(header, BorderLayout.NORTH);
			add(body, BorderLayout.CENTER);

			setPreferredSize(new Dimension(width, 300));
			setMinimumSize(new Dimension(width, 120));
			setMaximumSize(new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE));
		}
	}

	/** Backed directly by the JBrowserModel; no copying. */
	private static class ChildrenListModel extends AbstractListModel<Object> {
		private static final long serialVersionUID = 2954360106633421571L;
		private final JBrowserModel model;
		private final Object parent;

		ChildrenListModel(JBrowserModel model, Object parent) {
			this.model = model;
			this.parent = parent;
		}

		@Override
		public int getSize() {
			return parent == null || model == null ? 0 : model.getChildCount(parent);
		}

		@Override
		public Object getElementAt(int index) {
			return model.getChild(parent, index);
		}
	}

	/** Filtering view over a ChildrenListModel. */
	private static class FilteringListModel extends AbstractListModel<Object> {
		private final ChildrenListModel base;
		private List<Object> cache = new ArrayList<>();
		private String queryLower = "";
		private BrowserFilterer filterer = null;
		private JBrowserModel model = null;

		FilteringListModel(ChildrenListModel base) {
			this.base = base;
			rebuild();
		}

		void setQuery(String q, BrowserFilterer filterer, JBrowserModel model) {
			this.queryLower = (q == null) ? "" : q.trim().toLowerCase();
			this.filterer = filterer;
			this.model = model;
			rebuild();
		}

		int indexOf(Object node) {
			for (int i = 0; i < cache.size(); i++)
				if (cache.get(i).equals(node))
					return i;
			return -1;
		}

		private void rebuild() {
			List<Object> newCache = new ArrayList<>();
			int n = base.getSize();
			for (int i = 0; i < n; i++) {
				Object o = base.getElementAt(i);
				if (filterer == null || model == null || queryLower.isEmpty()
						|| filterer.include(o, queryLower, model)) {
					newCache.add(o);
				}
			}
			this.cache = newCache;
			fireContentsChanged(this, 0, Math.max(0, getSize() - 1));
		}

		@Override
		public int getSize() {
			return cache.size();
		}

		@Override
		public Object getElementAt(int index) {
			return cache.get(index);
		}
	}

	/** Default renderer showing folder/file-like icons using model hints. */
	private static class DefaultBrowserRenderer extends DefaultListCellRenderer {
		private static final long serialVersionUID = -6411572832683046564L;
		private Icon folderIcon, leafIcon;
		private JBrowserModel model;

		DefaultBrowserRenderer(JBrowserModel model) {
			setModel(model);
			folderIcon = UIManager.getIcon("FileView.directoryIcon");
			leafIcon = UIManager.getIcon("FileView.fileIcon");
		}

		void setModel(JBrowserModel model) {
			this.model = model;
		}

		@Override
		public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected,
				boolean cellHasFocus) {
			JLabel lbl = (JLabel) super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
			if (model != null) {
				lbl.setText(model.getText(value));
				lbl.setIcon(model.isExpandable(value) ? folderIcon : leafIcon);
			} else {
				lbl.setText(String.valueOf(value));
			}
			lbl.setBorder(BorderFactory.createEmptyBorder(2, 6, 2, 6));
			return lbl;
		}
	}

	
}