--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/widgets/Tree.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,2326 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+module dwt.widgets.Tree;
+
+import dwt.dwthelper.utils;
+
+ 
+import dwt.DWT;
+import dwt.DWTException;
+import dwt.events.SelectionEvent;
+import dwt.events.SelectionListener;
+import dwt.events.TreeListener;
+import dwt.graphics.Color;
+import dwt.graphics.Font;
+import dwt.graphics.Image;
+import dwt.graphics.Point;
+import dwt.graphics.Rectangle;
+import dwt.internal.cocoa.NSBrowserCell;
+import dwt.internal.cocoa.NSButtonCell;
+import dwt.internal.cocoa.NSIndexSet;
+import dwt.internal.cocoa.NSNumber;
+import dwt.internal.cocoa.NSOutlineView;
+import dwt.internal.cocoa.NSRect;
+import dwt.internal.cocoa.NSString;
+import dwt.internal.cocoa.NSTableColumn;
+import dwt.internal.cocoa.NSTableHeaderView;
+import dwt.internal.cocoa.NSTableView;
+import dwt.internal.cocoa.OS;
+import dwt.internal.cocoa.SWTOutlineView;
+import dwt.internal.cocoa.SWTScrollView;
+import dwt.internal.cocoa.SWTTreeItem;
+import dwt.internal.cocoa.id;
+
+/**
+ * Instances of this class provide a selectable user interface object
+ * that displays a hierarchy of items and issues notification when an
+ * item in the hierarchy is selected.
+ * <p>
+ * The item children that may be added to instances of this class
+ * must be of type <code>TreeItem</code>.
+ * </p><p>
+ * Style <code>VIRTUAL</code> is used to create a <code>Tree</code> whose
+ * <code>TreeItem</code>s are to be populated by the client on an on-demand basis
+ * instead of up-front.  This can provide significant performance improvements for
+ * trees that are very large or for which <code>TreeItem</code> population is
+ * expensive (for example, retrieving values from an external source).
+ * </p><p>
+ * Here is an example of using a <code>Tree</code> with style <code>VIRTUAL</code>:
+ * <code><pre>
+ *  final Tree tree = new Tree(parent, DWT.VIRTUAL | DWT.BORDER);
+ *  tree.setItemCount(20);
+ *  tree.addListener(DWT.SetData, new Listener() {
+ *      public void handleEvent(Event event) {
+ *          TreeItem item = (TreeItem)event.item;
+ *          TreeItem parentItem = item.getParentItem();
+ *          String text = null;
+ *          if (parentItem is null) {
+ *              text = "node " + tree.indexOf(item);
+ *          } else {
+ *              text = parentItem.getText() + " - " + parentItem.indexOf(item);
+ *          }
+ *          item.setText(text);
+ *          System.out.println(text);
+ *          item.setItemCount(10);
+ *      }
+ *  });
+ * </pre></code>
+ * </p><p>
+ * Note that although this class is a subclass of <code>Composite</code>,
+ * it does not make sense to add <code>Control</code> children to it,
+ * or set a layout on it.
+ * </p><p>
+ * <dl>
+ * <dt><b>Styles:</b></dt>
+ * <dd>SINGLE, MULTI, CHECK, FULL_SELECTION, VIRTUAL</dd>
+ * <dt><b>Events:</b></dt>
+ * <dd>Selection, DefaultSelection, Collapse, Expand, SetData, MeasureItem, EraseItem, PaintItem</dd>
+ * </dl>
+ * </p><p>
+ * Note: Only one of the styles SINGLE and MULTI may be specified.
+ * </p><p>
+ * IMPORTANT: This class is <em>not</em> intended to be subclassed.
+ * </p>
+ */
+public class Tree extends Composite {
+    NSTableColumn firstColumn, checkColumn;
+    NSTableHeaderView headerView;
+    TreeItem [] items;
+    int itemCount;
+    TreeColumn [] columns;
+    TreeColumn sortColumn;
+    int columnCount;
+    int sortDirection;
+    bool ignoreExpand, ignoreSelect;
+
+/**
+ * Constructs a new instance of this class given its parent
+ * and a style value describing its behavior and appearance.
+ * <p>
+ * The style value is either one of the style constants defined in
+ * class <code>DWT</code> which is applicable to instances of this
+ * class, or must be built by <em>bitwise OR</em>'ing together 
+ * (that is, using the <code>int</code> "|" operator) two or more
+ * of those <code>DWT</code> style constants. The class description
+ * lists the style constants that are applicable to the class.
+ * Style bits are also inherited from superclasses.
+ * </p>
+ *
+ * @param parent a composite control which will be the parent of the new instance (cannot be null)
+ * @param style the style of control to construct
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
+ *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
+ * </ul>
+ *
+ * @see DWT#SINGLE
+ * @see DWT#MULTI
+ * @see DWT#CHECK
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public Tree (Composite parent, int style) {
+    super (parent, checkStyle (style));
+}
+
+void _addListener (int eventType, Listener listener) {
+    super._addListener (eventType, listener);
+    for (int i = 0; i < items.length; i++) {
+        if (items [i] !is null) items [i].width = -1;        
+    }
+}
+
+TreeItem _getItem (TreeItem parentItem, int index) {
+    int count;
+    TreeItem[] items;
+    if (parentItem !is null) {
+        count = parentItem.itemCount;
+        items = parentItem.items;
+    } else {
+        count = this.itemCount;
+        items = this.items;
+    }
+    if (index < 0 || index >= count) return null;
+    TreeItem item = items [index]; 
+    if (item !is null || (style & DWT.VIRTUAL) is 0) return item;
+    item = new TreeItem (this, parentItem, DWT.NONE, index, false);
+    items [index] = item;
+    return item;
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when the user changes the receiver's selection, by sending
+ * it one of the messages defined in the <code>SelectionListener</code>
+ * interface.
+ * <p>
+ * When <code>widgetSelected</code> is called, the item field of the event object is valid.
+ * If the receiver has the <code>DWT.CHECK</code> style and the check selection changes,
+ * the event object detail field contains the value <code>DWT.CHECK</code>.
+ * <code>widgetDefaultSelected</code> is typically called when an item is double-clicked.
+ * The item field of the event object is valid for default selection, but the detail field is not used.
+ * </p>
+ *
+ * @param listener the listener which should be notified when the user changes the receiver's selection
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see SelectionListener
+ * @see #removeSelectionListener
+ * @see SelectionEvent
+ */
+public void addSelectionListener(SelectionListener listener) {
+    checkWidget ();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (DWT.Selection, typedListener);
+    addListener (DWT.DefaultSelection, typedListener);
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when an item in the receiver is expanded or collapsed
+ * by sending it one of the messages defined in the <code>TreeListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see TreeListener
+ * @see #removeTreeListener
+ */
+public void addTreeListener(TreeListener listener) {
+    checkWidget ();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (DWT.Expand, typedListener);
+    addListener (DWT.Collapse, typedListener);
+}
+
+bool checkData (TreeItem item, bool redraw) {
+    if (item.cached) return true;
+    if ((style & DWT.VIRTUAL) !is 0) {
+        item.cached = true;
+        Event event = new Event ();
+        TreeItem parentItem = item.getParentItem ();
+        event.item = item;
+        event.index = parentItem is null ? indexOf (item) : parentItem.indexOf (item);
+//      ignoreRedraw = true;
+        sendEvent (DWT.SetData, event);
+        //widget could be disposed at this point
+//      ignoreRedraw = false;
+        if (isDisposed () || item.isDisposed ()) return false;
+        if (redraw) {
+//          if (!setScrollWidth (item)) item.redraw (OS.kDataBrowserNoItem);
+        }
+    }
+    return true;
+}
+
+static int checkStyle (int style) {
+    /*
+    * Feature in Windows.  Even when WS_HSCROLL or
+    * WS_VSCROLL is not specified, Windows creates
+    * trees and tables with scroll bars.  The fix
+    * is to set H_SCROLL and V_SCROLL.
+    * 
+    * NOTE: This code appears on all platforms so that
+    * applications have consistent scroll bar behavior.
+    */
+    if ((style & DWT.NO_SCROLL) is 0) {
+        style |= DWT.H_SCROLL | DWT.V_SCROLL;
+    }
+    return checkBits (style, DWT.SINGLE, DWT.MULTI, 0, 0, 0, 0);
+}
+
+protected void checkSubclass () {
+    if (!isValidSubclass ()) error (DWT.ERROR_INVALID_SUBCLASS);
+}
+
+void clear (TreeItem parentItem, int index, bool all) {
+//  int [] ids = parentItem is null ? childIds : parentItem.childIds;
+//  TreeItem item = _getItem (ids [index], false);
+//  if (item !is null) {
+//      item.clear();
+//      if (all) {
+//          clearAll (item, true);
+//      } else {
+//          int container = parentItem is null ? OS.kDataBrowserNoItem : parentItem.id;
+//          OS.UpdateDataBrowserItems (handle, container, 1, new int[] {item.id}, OS.kDataBrowserItemNoProperty, OS.kDataBrowserNoItem);
+//      }
+//  }
+}
+
+void clearAll (TreeItem parentItem, bool all) {
+//  bool update = !inClearAll;
+//  int count = getItemCount (parentItem);
+//  if (count is 0) return;
+//  inClearAll = true;
+//  int [] ids = parentItem is null ? childIds : parentItem.childIds;
+//  for (int i=0; i<count; i++) {
+//      TreeItem item = _getItem (ids [i], false);
+//      if (item !is null) {
+//          item.clear ();
+//          if (all) clearAll (item, true);
+//      }
+//  }
+//  if (update) {
+//      OS.UpdateDataBrowserItems (handle, 0, 0, null, OS.kDataBrowserItemNoProperty, OS.kDataBrowserNoItem);
+//      inClearAll = false;
+//  }
+}
+
+/**
+ * Clears the item at the given zero-relative index in the receiver.
+ * The text, icon and other attributes of the item are set to the default
+ * value.  If the tree was created with the <code>DWT.VIRTUAL</code> style,
+ * these attributes are requested again as needed.
+ *
+ * @param index the index of the item to clear
+ * @param all <code>true</code> if all child items of the indexed item should be
+ * cleared recursively, and <code>false</code> otherwise
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @see DWT#VIRTUAL
+ * @see DWT#SetData
+ * 
+ * @since 3.2
+ */
+public void clear (int index, bool all) {
+    checkWidget ();
+    int count = getItemCount ();
+    if (index < 0 || index >= count) error (DWT.ERROR_INVALID_RANGE);
+    clear (null, index, all);
+}
+
+/**
+ * Clears all the items in the receiver. The text, icon and other
+ * attributes of the items are set to their default values. If the
+ * tree was created with the <code>DWT.VIRTUAL</code> style, these
+ * attributes are requested again as needed.
+ * 
+ * @param all <code>true</code> if all child items should be cleared
+ * recursively, and <code>false</code> otherwise
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @see DWT#VIRTUAL
+ * @see DWT#SetData
+ * 
+ * @since 3.2
+ */
+public void clearAll (bool all) {
+    checkWidget ();
+    clearAll (null, all);
+}
+
+public Point computeSize (int wHint, int hHint, bool changed) {
+    checkWidget ();
+    int width = 0, height = 0;
+    if (wHint is DWT.DEFAULT) {
+        if (columnCount !is 0) {
+            for (int i=0; i<columnCount; i++) {
+                width += columns [i].getWidth ();
+            }
+        } else {
+//          int levelIndent = DISCLOSURE_COLUMN_LEVEL_INDENT;
+//          if (OS.VERSION >= 0x1040) {
+//              float [] metric = new float [1];
+//              OS.DataBrowserGetMetric (handle, OS.kDataBrowserMetricDisclosureColumnPerDepthGap, null, metric);
+//              levelIndent = (int) metric [0];
+//          }
+//          GC gc = new GC (this);
+//          width = calculateWidth (childIds, gc, true, 0, levelIndent);
+//          gc.dispose ();
+//          width += getInsetWidth (column_id, true);
+        }
+        if ((style & DWT.CHECK) !is 0) width += getCheckColumnWidth ();
+    } else {
+        width = wHint;
+    }
+    if (hHint is DWT.DEFAULT) {
+        height = ((NSTableView)view).numberOfRows() * getItemHeight () + getHeaderHeight();
+    } else {
+        height = hHint;
+    }
+    if (width <= 0) width = DEFAULT_WIDTH;
+    if (height <= 0) height = DEFAULT_HEIGHT;
+    Rectangle rect = computeTrim (0, 0, width, height);
+    return new Point (rect.width, rect.height);
+}
+
+void createHandle () {
+    SWTScrollView scrollWidget = (SWTScrollView)new SWTScrollView().alloc();
+    scrollWidget.initWithFrame(new NSRect ());
+    scrollWidget.setHasHorizontalScroller(true);
+    scrollWidget.setHasVerticalScroller(true);
+    scrollWidget.setAutohidesScrollers(true);
+    scrollWidget.setBorderType(hasBorder() ? OS.NSBezelBorder : OS.NSNoBorder);
+    scrollWidget.setTag(jniRef);
+    
+    NSOutlineView widget = (NSOutlineView)new SWTOutlineView().alloc();
+    widget.initWithFrame(new NSRect());
+    widget.setAllowsMultipleSelection((style & DWT.MULTI) !is 0);
+    widget.setAutoresizesOutlineColumn(false);
+    widget.setAutosaveExpandedItems(true);
+    widget.setDataSource(widget);
+    widget.setDelegate(widget);
+    widget.setDoubleAction(OS.sel_sendDoubleSelection);
+    if (!hasBorder()) widget.setFocusRingType(OS.NSFocusRingTypeNone);
+    widget.setTag(jniRef);
+    
+    headerView = widget.headerView();
+    headerView.retain();
+    widget.setHeaderView(null);
+    
+    NSString str = NSString.stringWith("");
+    if ((style & DWT.CHECK) !is 0) {
+        checkColumn = (NSTableColumn)new NSTableColumn().alloc();
+        checkColumn.initWithIdentifier(str);
+        checkColumn.headerCell().setTitle(str);
+        widget.addTableColumn (checkColumn);
+        widget.setOutlineTableColumn(checkColumn);
+        NSButtonCell cell = (NSButtonCell)new NSButtonCell().alloc().init();
+        checkColumn.setDataCell(cell);
+        cell.setButtonType(OS.NSSwitchButton);
+        cell.setImagePosition(OS.NSImageOnly);
+        cell.setAllowsMixedState(true);
+        checkColumn.setWidth(getCheckColumnWidth());
+        checkColumn.setResizingMask(OS.NSTableColumnNoResizing);
+        checkColumn.setEditable(false);
+        cell.release();
+    }
+    
+    firstColumn = (NSTableColumn)new NSTableColumn().alloc();
+    firstColumn.initWithIdentifier(str);
+    firstColumn.headerCell().setTitle(str);
+    widget.addTableColumn (firstColumn);
+    widget.setOutlineTableColumn(firstColumn);
+    NSBrowserCell cell = (NSBrowserCell)new NSBrowserCell().alloc().init();
+    cell.setLeaf(true);
+    firstColumn.setDataCell(cell);
+    cell.release();
+    
+    scrollView = scrollWidget;
+    view = widget;
+    scrollView.setDocumentView(widget);
+    parent.contentView().addSubview_(scrollView);
+}
+
+void createItem (TreeColumn column, int index) {
+    if (!(0 <= index && index <= columnCount)) error (DWT.ERROR_INVALID_RANGE);
+    if (index is 0) {
+        // first column must be left aligned
+        column.style &= ~(DWT.LEFT | DWT.RIGHT | DWT.CENTER);
+        column.style |= DWT.LEFT;
+    }
+    if (columnCount is columns.length) {
+        TreeColumn [] newColumns = new TreeColumn [columnCount + 4];
+        System.arraycopy (columns, 0, newColumns, 0, columns.length);
+        columns = newColumns;
+    }
+    NSTableColumn nsColumn;
+    if (columnCount is 0) {
+        //TODO - clear attributes, alignment etc.
+        nsColumn = firstColumn;
+        firstColumn = null;
+    } else {
+        //TODO - set attributes, alignment etc.
+        NSString str = NSString.stringWith("");
+        nsColumn = (NSTableColumn)new NSTableColumn().alloc();
+        nsColumn.initWithIdentifier(str);
+        nsColumn.headerCell().setTitle(str);
+        ((NSTableView)view).addTableColumn (nsColumn);
+        int checkColumn = (style & DWT.CHECK) !is 0 ? 1 : 0;
+        ((NSTableView)view).moveColumn (columnCount + checkColumn, index + checkColumn);
+        NSBrowserCell cell = (NSBrowserCell)new NSBrowserCell().alloc().init();
+        cell.setLeaf(true);
+        nsColumn.setDataCell(cell);
+        cell.release();
+    }
+    column.nsColumn = nsColumn;
+    nsColumn.headerCell().setTitle(NSString.stringWith(""));
+    nsColumn.setWidth(0);
+    System.arraycopy (columns, index, columns, index + 1, columnCount++ - index);
+    columns [index] = column;
+    if (columnCount > 1) {
+        for (int i=0; i<items.length; i++) {
+            TreeItem item = items [i];
+            if (item !is null) {
+                String [] strings = item.strings;
+                if (strings !is null) {
+                    String [] temp = new String [columnCount];
+                    System.arraycopy (strings, 0, temp, 0, index);
+                    System.arraycopy (strings, index, temp, index+1, columnCount-index-1);
+                    temp [index] = "";
+                    item.strings = temp;
+                }
+                if (index is 0) item.text = "";
+                Image [] images = item.images;
+                if (images !is null) {
+                    Image [] temp = new Image [columnCount];
+                    System.arraycopy (images, 0, temp, 0, index);
+                    System.arraycopy (images, index, temp, index+1, columnCount-index-1);
+                    item.images = temp;
+                }
+                if (index is 0) item.image = null;
+                Color [] cellBackground = item.cellBackground;
+                if (cellBackground !is null) {
+                    Color [] temp = new Color [columnCount];
+                    System.arraycopy (cellBackground, 0, temp, 0, index);
+                    System.arraycopy (cellBackground, index, temp, index+1, columnCount-index-1);
+                    item.cellBackground = temp;
+                }
+                Color [] cellForeground = item.cellForeground;
+                if (cellForeground !is null) {
+                    Color [] temp = new Color [columnCount];
+                    System.arraycopy (cellForeground, 0, temp, 0, index);
+                    System.arraycopy (cellForeground, index, temp, index+1, columnCount-index-1);
+                    item.cellForeground = temp;
+                }
+                Font [] cellFont = item.cellFont;
+                if (cellFont !is null) {
+                    Font [] temp = new Font [columnCount];
+                    System.arraycopy (cellFont, 0, temp, 0, index);
+                    System.arraycopy (cellFont, index, temp, index+1, columnCount-index-1);
+                    item.cellFont = temp;
+                }
+            }
+        }
+    }
+}
+
+void createItem (TreeItem item, TreeItem parentItem, int index) {
+    int count;
+    TreeItem[] items;
+    if (parentItem !is null) {
+        count = parentItem.itemCount;
+        items = parentItem.items;
+    } else {
+        count = this.itemCount;
+        items = this.items;
+    }
+    if (index is -1) index = count;
+    if (!(0 <= index && index <= count)) error (DWT.ERROR_INVALID_RANGE);
+    if (count is items.length) {
+        TreeItem [] newItems = new TreeItem [items.length + 4];
+        System.arraycopy (items, 0, newItems, 0, items.length);
+        items = newItems;
+        if (parentItem !is null) {
+            parentItem.items = items;
+        } else {
+            this.items = items;
+        }
+    }
+    System.arraycopy (items, index, items, index + 1, count++ - index);
+    items [index] = item;
+    item.items = new TreeItem[4];
+    item.createJNIRef();
+    SWTTreeItem handle = (SWTTreeItem)new SWTTreeItem().alloc().init();
+    handle.setTag(item.jniRef);
+    item.handle = handle;
+    if (parentItem !is null) {
+        parentItem.itemCount = count;
+    } else {
+        this.itemCount = count;
+    }
+    //TODO ?
+    ((NSTableView)view).reloadData();
+}
+
+void createWidget () {
+    super.createWidget ();
+    items = new TreeItem [4];
+    columns = new TreeColumn [4];
+}
+
+Color defaultBackground () {
+    return display.getSystemColor (DWT.COLOR_LIST_BACKGROUND);
+}
+
+Color defaultForeground () {
+    return display.getSystemColor (DWT.COLOR_LIST_FOREGROUND);
+}
+
+/**
+ * Deselects all selected items in the receiver.
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void deselectAll () {
+    checkWidget ();
+    NSTableView widget = (NSTableView)view;
+    ignoreSelect = true;
+    widget.deselectAll(null);
+    ignoreSelect = false;
+}
+
+public void deselect (TreeItem item) {
+    checkWidget ();
+    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (item.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+//  ignoreSelect = true;
+//  /*
+//  * Bug in the Macintosh.  When the DataBroswer selection flags includes
+//  * both kDataBrowserNeverEmptySelectionSet and kDataBrowserSelectOnlyOne,
+//  * two items are selected when SetDataBrowserSelectedItems() is called
+//  * with kDataBrowserItemsAssign to assign a new seletion despite the fact
+//  * that kDataBrowserSelectOnlyOne was specified.  The fix is to save and
+//  * restore kDataBrowserNeverEmptySelectionSet around each call to
+//  * SetDataBrowserSelectedItems().
+//  */
+//  int [] selectionFlags = null;
+//  if ((style & DWT.SINGLE) !is 0) {
+//      selectionFlags = new int [1];
+//      OS.GetDataBrowserSelectionFlags (handle, selectionFlags);
+//      OS.SetDataBrowserSelectionFlags (handle, selectionFlags [0] & ~OS.kDataBrowserNeverEmptySelectionSet);
+//  }
+//  OS.SetDataBrowserSelectedItems (handle, 1, new int [] {item.id}, OS.kDataBrowserItemsRemove);
+//  if ((style & DWT.SINGLE) !is 0) {
+//      OS.SetDataBrowserSelectionFlags (handle, selectionFlags [0]);
+//  }
+//  ignoreSelect = false;
+}
+
+
+void destroyItem (TreeColumn column) {
+    int index = 0;
+    while (index < columnCount) {
+        if (columns [index] is column) break;
+        index++;
+    }
+    for (int i=0; i<items.length; i++) {
+        TreeItem item = items [i];
+        if (item !is null) {
+            if (columnCount <= 1) {
+                item.strings = null;
+                item.images = null;
+                item.cellBackground = null;
+                item.cellForeground = null;
+                item.cellFont = null;
+            } else {
+                if (item.strings !is null) {
+                    String [] strings = item.strings;
+                    if (index is 0) {
+                        item.text = strings [1] !is null ? strings [1] : "";
+                    }
+                    String [] temp = new String [columnCount - 1];
+                    System.arraycopy (strings, 0, temp, 0, index);
+                    System.arraycopy (strings, index + 1, temp, index, columnCount - 1 - index);
+                    item.strings = temp;
+                } else {
+                    if (index is 0) item.text = "";
+                }
+                if (item.images !is null) {
+                    Image [] images = item.images;
+                    if (index is 0) item.image = images [1];
+                    Image [] temp = new Image [columnCount - 1];
+                    System.arraycopy (images, 0, temp, 0, index);
+                    System.arraycopy (images, index + 1, temp, index, columnCount - 1 - index);
+                    item.images = temp;
+                } else {
+                    if (index is 0) item.image = null;
+                }
+                if (item.cellBackground !is null) {
+                    Color [] cellBackground = item.cellBackground;
+                    Color [] temp = new Color [columnCount - 1];
+                    System.arraycopy (cellBackground, 0, temp, 0, index);
+                    System.arraycopy (cellBackground, index + 1, temp, index, columnCount - 1 - index);
+                    item.cellBackground = temp;
+                }
+                if (item.cellForeground !is null) {
+                    Color [] cellForeground = item.cellForeground;
+                    Color [] temp = new Color [columnCount - 1];
+                    System.arraycopy (cellForeground, 0, temp, 0, index);
+                    System.arraycopy (cellForeground, index + 1, temp, index, columnCount - 1 - index);
+                    item.cellForeground = temp;
+                }
+                if (item.cellFont !is null) {
+                    Font [] cellFont = item.cellFont;
+                    Font [] temp = new Font [columnCount - 1];
+                    System.arraycopy (cellFont, 0, temp, 0, index);
+                    System.arraycopy (cellFont, index + 1, temp, index, columnCount - 1 - index);
+                    item.cellFont = temp;
+                }
+            }
+        }
+    }
+//  if (columnCount is 1) {
+//      column_id = column.id; idCount = 0;
+//      DataBrowserListViewHeaderDesc desc = new DataBrowserListViewHeaderDesc ();
+//      desc.version = OS.kDataBrowserListViewLatestHeaderDesc;
+//      short [] width = new short [1];
+//      OS.GetDataBrowserTableViewNamedColumnWidth (handle, column_id, width);
+//      desc.minimumWidth = desc.maximumWidth = width [0];
+//      int str = OS.CFStringCreateWithCharacters (OS.kCFAllocatorDefault, null, 0);
+//      desc.titleString = str;
+//      OS.SetDataBrowserListViewHeaderDesc (handle, column_id, desc);
+//      OS.CFRelease (str);
+//  } else {
+//      int [] disclosure = new int [1];
+//      bool [] expandableRows = new bool [1];
+//      OS.GetDataBrowserListViewDisclosureColumn (handle, disclosure, expandableRows);
+//      if (disclosure [0] is column.id) {
+//          TreeColumn firstColumn = columns [1];
+//          firstColumn.style &= ~(DWT.LEFT | DWT.RIGHT | DWT.CENTER);
+//          firstColumn.style |= DWT.LEFT;
+//          firstColumn.updateHeader();
+//          OS.SetDataBrowserListViewDisclosureColumn (handle, firstColumn.id, expandableRows [0]);
+//      }
+//      if (OS.RemoveDataBrowserTableViewColumn (handle, column.id) !is OS.noErr) {
+//          error (DWT.ERROR_ITEM_NOT_REMOVED);
+//      }
+//  }
+    System.arraycopy (columns, index + 1, columns, index, --columnCount - index);
+    columns [columnCount] = null;
+    for (int i=index; i<columnCount; i++) {
+        columns [i].sendEvent (DWT.Move);
+    }
+}
+
+void destroyItem (TreeItem item) {
+    int count;
+    TreeItem[] items;
+    TreeItem parentItem = item.parentItem;
+    if (parentItem !is null) {
+        count = parentItem.itemCount;
+        items = parentItem.items;
+    } else {
+        count = this.itemCount;
+        items = this.items;
+    }
+    int index = 0;
+    while (index < count) {
+        if (items [index] is item) break;
+        index++;
+    }
+//  if (index !is itemCount - 1) fixSelection (index, false); 
+    System.arraycopy (items, index + 1, items, index, --count - index);
+    items [count] = null;
+    if (parentItem !is null) {
+        parentItem.itemCount = count;
+        ((NSOutlineView)view).reloadItem_reloadChildren_(parentItem.handle, true);
+    } else {
+        this.itemCount = count;
+        ((NSOutlineView)view).reloadItem_(null);
+    }
+    
+    //noteNumberOfRowsChanged was causing crashes whenever
+    //a TreeItem was disposed. 
+    //Using reloadItem avoids the crashes.
+    //Not sure that this NSTableView function 
+    //makes sense in an NSOutlineView.
+    
+    //((NSTableView)view).noteNumberOfRowsChanged();
+    
+//  setScrollWidth (true);
+//  fixScrollBar ();
+}
+
+
+void fixScrollBar () {
+    /*
+    * Bug in the Macintosh. For some reason, the data browser does not update
+    * the vertical scrollbar when it is scrolled to the bottom and items are
+    * removed.  The fix is to check if the scrollbar value is bigger the
+    * maximum number of visible items and clamp it when needed.
+    */
+//  int [] top = new int [1], left = new int [1];
+//  OS.GetDataBrowserScrollPosition (handle, top, left);
+//  int maximum = Math.max (0, getItemHeight () * visibleCount - getClientArea ().height);
+//  if (top [0] > maximum) {
+//      OS.SetDataBrowserScrollPosition (handle, maximum, left [0]);
+//  }
+}
+
+int getCheckColumnWidth () {
+    return 20; //TODO - compute width
+}
+
+/**
+ * Returns the column at the given, zero-relative index in the
+ * receiver. Throws an exception if the index is out of range.
+ * Columns are returned in the order that they were created.
+ * If no <code>TreeColumn</code>s were created by the programmer,
+ * this method will throw <code>ERROR_INVALID_RANGE</code> despite
+ * the fact that a single column of data may be visible in the tree.
+ * This occurs when the programmer uses the tree like a list, adding
+ * items but never creating a column.
+ *
+ * @param index the index of the column to return
+ * @return the column at the given index
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @see Tree#getColumnOrder()
+ * @see Tree#setColumnOrder(int[])
+ * @see TreeColumn#getMoveable()
+ * @see TreeColumn#setMoveable(bool)
+ * @see DWT#Move
+ * 
+ * @since 3.1
+ */
+public TreeColumn getColumn (int index) {
+    checkWidget ();
+    if (!(0 <=index && index < columnCount)) error (DWT.ERROR_INVALID_RANGE);
+    return columns [index];
+}
+
+/**
+ * Returns the number of columns contained in the receiver.
+ * If no <code>TreeColumn</code>s were created by the programmer,
+ * this value is zero, despite the fact that visually, one column
+ * of items may be visible. This occurs when the programmer uses
+ * the tree like a list, adding items but never creating a column.
+ *
+ * @return the number of columns
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public int getColumnCount () {
+    checkWidget ();
+    return columnCount;
+}
+
+/**
+ * Returns an array of zero-relative integers that map
+ * the creation order of the receiver's items to the
+ * order in which they are currently being displayed.
+ * <p>
+ * Specifically, the indices of the returned array represent
+ * the current visual order of the items, and the contents
+ * of the array represent the creation order of the items.
+ * </p><p>
+ * Note: This is not the actual structure used by the receiver
+ * to maintain its list of items, so modifying the array will
+ * not affect the receiver. 
+ * </p>
+ *
+ * @return the current visual order of the receiver's items
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @see Tree#setColumnOrder(int[])
+ * @see TreeColumn#getMoveable()
+ * @see TreeColumn#setMoveable(bool)
+ * @see DWT#Move
+ * 
+ * @since 3.2
+ */
+public int [] getColumnOrder () {
+    checkWidget ();
+    int [] order = new int [columnCount];
+    int [] position = new int [1];
+    for (int i=0; i<columnCount; i++) {
+        TreeColumn column = columns [i];
+//      OS.GetDataBrowserTableViewColumnPosition (handle, column.id, position);
+//      if ((style & DWT.CHECK) !is 0) position [0] -= 1;
+        order [position [0]] = i;
+    }
+    return order;
+}
+
+/**
+ * Returns an array of <code>TreeColumn</code>s which are the
+ * columns in the receiver. Columns are returned in the order
+ * that they were created.  If no <code>TreeColumn</code>s were
+ * created by the programmer, the array is empty, despite the fact
+ * that visually, one column of items may be visible. This occurs
+ * when the programmer uses the tree like a list, adding items but
+ * never creating a column.
+ * <p>
+ * Note: This is not the actual structure used by the receiver
+ * to maintain its list of items, so modifying the array will
+ * not affect the receiver. 
+ * </p>
+ *
+ * @return the items in the receiver
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @see Tree#getColumnOrder()
+ * @see Tree#setColumnOrder(int[])
+ * @see TreeColumn#getMoveable()
+ * @see TreeColumn#setMoveable(bool)
+ * @see DWT#Move
+ * 
+ * @since 3.1
+ */
+public TreeColumn [] getColumns () {
+    checkWidget ();
+    TreeColumn [] result = new TreeColumn [columnCount];
+    System.arraycopy (columns, 0, result, 0, columnCount);
+    return result;
+}
+
+/**
+ * Returns the width in pixels of a grid line.
+ *
+ * @return the width of a grid line in pixels
+ * 
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public int getGridLineWidth () {
+    checkWidget ();
+    return 0;
+}
+
+/**
+ * Returns the height of the receiver's header 
+ *
+ * @return the height of the header or zero if the header is not visible
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1 
+ */
+public int getHeaderHeight () {
+    checkWidget ();
+    NSTableHeaderView headerView = ((NSTableView)view).headerView();
+    if (headerView is null) return 0;
+    return (int)headerView.bounds().height;
+}
+
+/**
+ * Returns <code>true</code> if the receiver's header is visible,
+ * and <code>false</code> otherwise.
+ * <p>
+ * If one of the receiver's ancestors is not visible or some
+ * other condition makes the receiver not visible, this method
+ * may still indicate that it is considered visible even though
+ * it may not actually be showing.
+ * </p>
+ *
+ * @return the receiver's header's visibility state
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public bool getHeaderVisible () {
+    checkWidget ();
+    return ((NSTableView)view).headerView() !is null;
+}
+
+/**
+ * Returns the item at the given, zero-relative index in the
+ * receiver. Throws an exception if the index is out of range.
+ *
+ * @param index the index of the item to return
+ * @return the item at the given index
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public TreeItem getItem (int index) {
+    checkWidget ();
+    int count = getItemCount ();
+    if (index < 0 || index >= count) error (DWT.ERROR_INVALID_RANGE);
+    return _getItem (null, index);
+}
+
+/**
+ * Returns the item at the given point in the receiver
+ * or null if no such item exists. The point is in the
+ * coordinate system of the receiver.
+ * <p>
+ * The item that is returned represents an item that could be selected by the user.
+ * For example, if selection only occurs in items in the first column, then null is 
+ * returned if the point is outside of the item. 
+ * Note that the DWT.FULL_SELECTION style hint, which specifies the selection policy,
+ * determines the extent of the selection.
+ * </p>
+ *
+ * @param point the point used to locate the item
+ * @return the item at the given point, or null if the point is not in a selectable item
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public TreeItem getItem (Point point) {
+    checkWidget ();
+    if (point is null) error (DWT.ERROR_NULL_ARGUMENT);
+//  Rect rect = new Rect ();
+//  dwt.internal.carbon.Point pt = new dwt.internal.carbon.Point ();
+//  OS.SetPt (pt, (short) point.x, (short) point.y);
+//  if (0 < lastHittest && lastHittest <= items.length && lastHittestColumn !is 0) {
+//      TreeItem item = _getItem (lastHittest, false);
+//      if (item !is null) {
+//          if (OS.GetDataBrowserItemPartBounds (handle, item.id, lastHittestColumn, OS.kDataBrowserPropertyDisclosurePart, rect) is OS.noErr) {
+//              if (OS.PtInRect (pt, rect)) return null;
+//          }
+//          if (OS.GetDataBrowserItemPartBounds (handle, item.id, lastHittestColumn, OS.kDataBrowserPropertyEnclosingPart, rect) is OS.noErr) {
+//              if (rect.top <= pt.v && pt.v <= rect.bottom) {
+//                  if ((style & DWT.FULL_SELECTION) !is 0) {
+//                      return item;
+//                  } else {
+//                      return OS.PtInRect (pt, rect) ? item : null;
+//                  }
+//              }
+//          }
+//      }
+//  }
+//  //TODO - optimize
+//  for (int i=0; i<items.length; i++) {
+//      TreeItem item = items [i];
+//      if (item !is null) {
+//          if (OS.GetDataBrowserItemPartBounds (handle, item.id, column_id, OS.kDataBrowserPropertyDisclosurePart, rect) is OS.noErr) {
+//              if (OS.PtInRect (pt, rect)) return null;
+//          }
+//          if (columnCount is 0) {
+//              if (OS.GetDataBrowserItemPartBounds (handle, item.id, column_id, OS.kDataBrowserPropertyEnclosingPart, rect) is OS.noErr) {
+//                  if (rect.top <= pt.v && pt.v <= rect.bottom) {
+//                      if ((style & DWT.FULL_SELECTION) !is 0) {
+//                          return item;
+//                      } else {
+//                          return OS.PtInRect (pt, rect) ? item : null;
+//                      }
+//                  }
+//              }
+//          } else {
+//              for (int j = 0; j < columnCount; j++) {
+//                  if (OS.GetDataBrowserItemPartBounds (handle, item.id, columns [j].id, OS.kDataBrowserPropertyEnclosingPart, rect) is OS.noErr) {
+//                      if (rect.top <= pt.v && pt.v <= rect.bottom) {
+//                          if ((style & DWT.FULL_SELECTION) !is 0) {
+//                              return item;
+//                          } else {
+//                              return OS.PtInRect (pt, rect) ? item : null;
+//                          }
+//                      }
+//                  }
+//              }
+//          }
+//      }
+//  }
+    return null;
+}
+
+/**
+ * Returns the number of items contained in the receiver
+ * that are direct item children of the receiver.  The
+ * number that is returned is the number of roots in the
+ * tree.
+ *
+ * @return the number of items
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getItemCount () {
+    checkWidget ();
+    return itemCount;
+}
+
+/**
+ * Returns the height of the area which would be used to
+ * display <em>one</em> of the items in the tree.
+ *
+ * @return the height of one item
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getItemHeight () {
+    checkWidget ();
+    return (int)((NSTableView)view).rowHeight();
+}
+
+/**
+ * Returns a (possibly empty) array of items contained in the
+ * receiver that are direct item children of the receiver.  These
+ * are the roots of the tree.
+ * <p>
+ * Note: This is not the actual structure used by the receiver
+ * to maintain its list of items, so modifying the array will
+ * not affect the receiver. 
+ * </p>
+ *
+ * @return the items
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public TreeItem [] getItems () {
+    checkWidget ();
+    TreeItem [] result = new TreeItem [itemCount];
+    for (int i=0; i<itemCount; i++) {
+        result [i] = _getItem (null, i);
+    }
+    return result;
+}
+
+/**
+ * Returns <code>true</code> if the receiver's lines are visible,
+ * and <code>false</code> otherwise.
+ * <p>
+ * If one of the receiver's ancestors is not visible or some
+ * other condition makes the receiver not visible, this method
+ * may still indicate that it is considered visible even though
+ * it may not actually be showing.
+ * </p>
+ *
+ * @return the visibility state of the lines
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public bool getLinesVisible () {
+    checkWidget ();
+//  if (OS.VERSION >= 0x1040) {
+//      int [] attrib = new int [1];
+//      OS.DataBrowserGetAttributes (handle, attrib);
+//      return (attrib [0] & (OS.kDataBrowserAttributeListViewAlternatingRowColors | OS.kDataBrowserAttributeListViewDrawColumnDividers)) !is 0;
+//  }
+    return false;
+}
+
+/**
+ * Returns the receiver's parent item, which must be a
+ * <code>TreeItem</code> or null when the receiver is a
+ * root.
+ *
+ * @return the receiver's parent item
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public TreeItem getParentItem () {
+    checkWidget ();
+    return null;
+}
+
+/**
+ * Returns an array of <code>TreeItem</code>s that are currently
+ * selected in the receiver. The order of the items is unspecified.
+ * An empty array indicates that no items are selected. 
+ * <p>
+ * Note: This is not the actual structure used by the receiver
+ * to maintain its selection, so modifying the array will
+ * not affect the receiver. 
+ * </p>
+ * @return an array representing the selection
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public TreeItem [] getSelection () {
+    checkWidget ();
+    NSOutlineView widget = (NSOutlineView)view;
+    if (widget.numberOfSelectedRows() is 0) {
+        return new TreeItem [0];
+    }
+    NSIndexSet selection = widget.selectedRowIndexes();
+    int count = selection.count();
+    int [] indexBuffer = new int [count];
+    selection.getIndexes(indexBuffer, count, 0);
+    TreeItem [] result = new TreeItem  [count];
+    for (int i=0; i<count; i++) {
+        id item = widget.itemAtRow(indexBuffer [i]);
+        int jniRef = OS.objc_msgSend(item.id, OS.sel_tag);
+        if (jniRef !is -1 && jniRef !is 0) {
+            //TODO virtual
+            result[i] = (TreeItem)OS.JNIGetObject(jniRef);
+        }
+    }
+    return result;
+}
+
+/**
+ * Returns the number of selected items contained in the receiver.
+ *
+ * @return the number of selected items
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getSelectionCount () {
+    checkWidget ();
+    return ((NSTableView)view).numberOfSelectedRows();
+}
+
+/**
+ * Returns the column which shows the sort indicator for
+ * the receiver. The value may be null if no column shows
+ * the sort indicator.
+ *
+ * @return the sort indicator 
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @see #setSortColumn(TreeColumn)
+ * 
+ * @since 3.2
+ */
+public TreeColumn getSortColumn () {
+    checkWidget ();
+    return sortColumn;
+}
+
+/**
+ * Returns the direction of the sort indicator for the receiver. 
+ * The value will be one of <code>UP</code>, <code>DOWN</code> 
+ * or <code>NONE</code>.
+ *
+ * @return the sort direction
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @see #setSortDirection(int)
+ * 
+ * @since 3.2
+ */
+public int getSortDirection () {
+    checkWidget ();
+    return sortDirection;
+}
+
+/**
+ * Returns the item which is currently at the top of the receiver.
+ * This item can change when items are expanded, collapsed, scrolled
+ * or new items are added or removed.
+ *
+ * @return the item at the top of the receiver 
+ * 
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 2.1
+ */
+public TreeItem getTopItem () {
+    checkWidget();
+//  //TODO - optimize
+//  Rect rect = new Rect ();
+//  int y = getBorder () + getHeaderHeight ();
+//  for (int i=0; i<items.length; i++) {
+//      TreeItem item = items [i];
+//      if (item !is null) {
+//          int columnId = (columnCount is 0) ? column_id : columns [0].id;
+//          if (OS.GetDataBrowserItemPartBounds (handle, item.id, columnId, OS.kDataBrowserPropertyEnclosingPart, rect) is OS.noErr) {
+//              if (rect.top <= y && y <= rect.bottom) return item;
+//          }
+//      }
+//  }
+    return null;
+}
+
+/**
+ * Searches the receiver's list starting at the first column
+ * (index 0) until a column is found that is equal to the 
+ * argument, and returns the index of that column. If no column
+ * is found, returns -1.
+ *
+ * @param column the search column
+ * @return the index of the column
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the column is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public int indexOf (TreeColumn column) {
+    checkWidget ();
+    if (column is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (column.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+    for (int i=0; i<columnCount; i++) {
+        if (columns [i] is column) return i;
+    }
+    return -1;
+}
+
+/**
+ * Searches the receiver's list starting at the first item
+ * (index 0) until an item is found that is equal to the 
+ * argument, and returns the index of that item. If no item
+ * is found, returns -1.
+ *
+ * @param item the search item
+ * @return the index of the item
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public int indexOf (TreeItem item) {
+    checkWidget ();
+    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (item.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+    if (item.parentItem !is null) return -1;
+    for (int i = 0; i < itemCount; i++) {
+        if (item is items[i]) return i;
+    }
+    return -1;
+}
+
+int outlineView_child_ofItem(int outlineView, int index, int ref) {
+    TreeItem parent = null;
+    if (ref !is 0) parent = (TreeItem)OS.JNIGetObject(OS.objc_msgSend(ref, OS.sel_tag));
+    TreeItem item = _getItem(parent, index);
+    return item.handle.id;
+}
+
+int outlineView_objectValueForTableColumn_byItem(int outlineView, int tableColumn, int ref) {
+    TreeItem item = (TreeItem)OS.JNIGetObject(OS.objc_msgSend(ref, OS.sel_tag));
+    if (checkColumn !is null && tableColumn is checkColumn.id) {
+        NSNumber value;
+        if (item.checked && item.grayed) {
+            value = NSNumber.numberWithInt(OS.NSMixedState);
+        } else {
+            value = NSNumber.numberWithInt(item.checked ? OS.NSOnState : OS.NSOffState);
+        }
+        return value.id;
+    }
+    for (int i=0; i<columnCount; i++) {
+        if (columns [i].nsColumn.id is tableColumn) {
+            return item.createString(i).id;
+        }
+    }
+    return item.createString(0).id;
+}
+
+bool outlineView_isItemExpandable(int outlineView, int ref) {
+    if (ref is 0) return true;
+    return ((TreeItem)OS.JNIGetObject(OS.objc_msgSend(ref, OS.sel_tag))).itemCount !is 0;
+}
+
+int outlineView_numberOfChildrenOfItem(int outlineView, int ref) {
+    if (ref is 0) return itemCount;
+    return ((TreeItem)OS.JNIGetObject(OS.objc_msgSend(ref, OS.sel_tag))).itemCount;
+}
+
+void outlineView_willDisplayCell_forTableColumn_item(int outlineView, int cell, int tableColumn, int ref) {
+    if (checkColumn !is null && tableColumn is checkColumn.id) return;
+    TreeItem item = (TreeItem)OS.JNIGetObject(OS.objc_msgSend(ref, OS.sel_tag));
+    Image image = item.image;
+    for (int i=0; i<columnCount; i++) {
+        if (columns [i].nsColumn.id is tableColumn) {
+            image = item.getImage(i);
+        }
+    }
+    NSBrowserCell browserCell = new NSBrowserCell(cell);
+    browserCell.setImage(image !is null ? image.handle : null);
+}
+
+void outlineViewSelectionDidChange(int notification) {
+    if (ignoreSelect) return;
+    NSOutlineView widget = (NSOutlineView)view;
+    int row = widget.selectedRow();
+    if(row is -1)
+        postEvent(DWT.Selection);
+    else {
+        id _id = widget.itemAtRow(row);
+        TreeItem item = (TreeItem)OS.JNIGetObject(OS.objc_msgSend(_id.id, OS.sel_tag));
+        Event event = new Event();
+        event.item = item;
+        event.index = row;
+        postEvent(DWT.Selection, event);
+    }
+}
+
+bool outlineView_shouldCollapseItem(int outlineView, int ref) {
+    if (!ignoreExpand) {
+        TreeItem item = (TreeItem)OS.JNIGetObject(OS.objc_msgSend(ref, OS.sel_tag));
+        Event event = new Event();
+        event.item = item;
+        sendEvent(DWT.Collapse, event);
+        item.expanded = false;
+    }
+    return true;
+}
+
+bool outlineView_shouldExpandItem(int outlineView, int ref) {
+    if (!ignoreExpand) {
+        TreeItem item = (TreeItem)OS.JNIGetObject(OS.objc_msgSend(ref, OS.sel_tag));
+        Event event = new Event();
+        event.item = item;
+        sendEvent(DWT.Expand, event);
+        item.expanded = true;
+    }
+    return true;
+}
+
+void outlineView_setObjectValue_forTableColumn_byItem(int outlineView, int object, int tableColumn, int ref) {
+    TreeItem item = (TreeItem)OS.JNIGetObject(OS.objc_msgSend(ref, OS.sel_tag));
+    if (checkColumn !is null && tableColumn is checkColumn.id)  {
+        item.checked = !item.checked;
+        Event event = new Event();
+        event.detail = DWT.CHECK;
+        event.item = item;
+        postEvent(DWT.Selection, event);
+    }
+}
+
+void releaseChildren (bool destroy) {
+    for (int i=0; i<items.length; i++) {
+        TreeItem item = items [i];
+        if (item !is null && !item.isDisposed ()) {
+            item.release (false);
+        }
+    }
+    items = null;
+    if (columns !is null) {
+        for (int i=0; i<columnCount; i++) {
+            TreeColumn column = columns [i];
+            if (column !is null && !column.isDisposed ()) {
+                column.release (false);
+            }
+        }
+        columns = null;
+    }
+    super.releaseChildren (destroy);
+}
+
+void releaseHandle () {
+    super.releaseHandle ();
+    if (headerView !is null) headerView.release();
+    headerView = null;
+    if (firstColumn !is null) firstColumn.release();
+    firstColumn = null;
+    if (checkColumn !is null) checkColumn.release();
+    checkColumn = null;
+}
+
+void releaseWidget () {
+    super.releaseWidget ();
+    //release handle
+    sortColumn = null;
+}
+
+/**
+ * Removes all of the items from the receiver.
+ * 
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void removeAll () {
+    checkWidget ();
+    for (int i=0; i<items.length; i++) {
+        TreeItem item = items [i];
+        if (item !is null && !item.isDisposed ()) item.release (false);
+    }
+    items = new TreeItem [4];
+    itemCount = 0;
+    ((NSOutlineView)view).reloadItem_(null);
+    //((NSTableView)view).noteNumberOfRowsChanged();
+//  setScrollWidth (true);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when the user changes the receiver's selection.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see SelectionListener
+ * @see #addSelectionListener
+ */
+public void removeSelectionListener (SelectionListener listener) {
+    checkWidget ();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    eventTable.unhook (DWT.Selection, listener);
+    eventTable.unhook (DWT.DefaultSelection, listener); 
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when items in the receiver are expanded or collapsed.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see TreeListener
+ * @see #addTreeListener
+ */
+public void removeTreeListener(TreeListener listener) {
+    checkWidget ();
+    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (DWT.Expand, listener);
+    eventTable.unhook (DWT.Collapse, listener);
+}
+
+/**
+ * Display a mark indicating the point at which an item will be inserted.
+ * The drop insert item has a visual hint to show where a dragged item 
+ * will be inserted when dropped on the tree.
+ * 
+ * @param item the insert item.  Null will clear the insertion mark.
+ * @param before true places the insert mark above 'item'. false places 
+ *  the insert mark below 'item'.
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setInsertMark (TreeItem item, bool before) {
+    checkWidget ();
+    if (item !is null) {
+        if (item.isDisposed()) error(DWT.ERROR_INVALID_ARGUMENT);
+    }
+}
+
+/**
+ * Selects all of the items in the receiver.
+ * <p>
+ * If the receiver is single-select, do nothing.
+ * </p>
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void selectAll () {
+    checkWidget ();
+    if ((style & DWT.SINGLE) !is 0) return;
+    NSTableView widget = (NSTableView)view;
+    ignoreSelect = true;
+    widget.selectAll(null);
+    ignoreSelect = false;
+}
+
+public void select (TreeItem item) {
+    checkWidget ();
+    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (item.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+//  showItem (item, false);
+//  ignoreSelect = true;
+//  /*
+//  * Bug in the Macintosh.  When the DataBroswer selection flags includes
+//  * both kDataBrowserNeverEmptySelectionSet and kDataBrowserSelectOnlyOne,
+//    * two items are selected when SetDataBrowserSelectedItems() is called
+//    * with kDataBrowserItemsAssign to assign a new seletion despite the fact
+//  * that kDataBrowserSelectOnlyOne was specified.  The fix is to save and
+//  * restore kDataBrowserNeverEmptySelectionSet around each call to
+//  * SetDataBrowserSelectedItems().
+//  */
+//  int [] selectionFlags = null;
+//  if ((style & DWT.SINGLE) !is 0) {
+//      selectionFlags = new int [1];
+//      OS.GetDataBrowserSelectionFlags (handle, selectionFlags);
+//      OS.SetDataBrowserSelectionFlags (handle, selectionFlags [0] & ~OS.kDataBrowserNeverEmptySelectionSet);
+//  }
+//  OS.SetDataBrowserSelectedItems (handle, 1, new int [] {item.id}, OS.kDataBrowserItemsAssign);
+//  if ((style & DWT.SINGLE) !is 0) {
+//      OS.SetDataBrowserSelectionFlags (handle, selectionFlags [0]);
+//  }
+//  ignoreSelect = false;
+}
+
+void sendDoubleSelection() {
+    postEvent (DWT.DefaultSelection);
+}
+
+/**
+ * Sets the order that the items in the receiver should 
+ * be displayed in to the given argument which is described
+ * in terms of the zero-relative ordering of when the items
+ * were added.
+ *
+ * @param order the new order to display the items
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the item order is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the item order is not the same length as the number of items</li>
+ * </ul>
+ * 
+ * @see Tree#getColumnOrder()
+ * @see TreeColumn#getMoveable()
+ * @see TreeColumn#setMoveable(bool)
+ * @see DWT#Move
+ * 
+ * @since 3.2
+ */
+public void setColumnOrder (int [] order) {
+    checkWidget ();
+    if (order is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (columnCount is 0) {
+        if (order.length !is 0) error (DWT.ERROR_INVALID_ARGUMENT);
+        return;
+    }
+    if (order.length !is columnCount) error (DWT.ERROR_INVALID_ARGUMENT);
+    int [] oldOrder = getColumnOrder ();
+    bool reorder = false;
+    bool [] seen = new bool [columnCount];
+    for (int i=0; i<order.length; i++) {
+        int index = order [i];
+        if (index < 0 || index >= columnCount) error (DWT.ERROR_INVALID_ARGUMENT);
+        if (seen [index]) error (DWT.ERROR_INVALID_ARGUMENT);
+        seen [index] = true;
+        if (order [i] !is oldOrder [i]) reorder = true;
+    }
+    if (reorder) {
+        int [] disclosure = new int [1];
+        bool [] expandableRows = new bool [1];
+//      OS.GetDataBrowserListViewDisclosureColumn (handle, disclosure, expandableRows);
+        TreeColumn firstColumn = columns [order [0]];
+//      if (disclosure [0] !is firstColumn.id) {
+//          OS.SetDataBrowserListViewDisclosureColumn (handle, firstColumn.id, expandableRows [0]);
+//      }
+        int x = 0;
+        short [] width = new short [1];
+        int [] oldX = new int [oldOrder.length];
+        for (int i=0; i<oldOrder.length; i++) {
+            int index = oldOrder [i];
+            TreeColumn column = columns [index];
+            oldX [index] =  x;
+//          OS.GetDataBrowserTableViewNamedColumnWidth(handle, column.id, width);
+            x += width [0];
+        }
+        x = 0;
+        int [] newX = new int [order.length];
+        for (int i=0; i<order.length; i++) {
+            int index = order [i];
+            TreeColumn column = columns [index];
+            int position = (style & DWT.CHECK) !is 0 ? i + 1 : i;
+//          OS.SetDataBrowserTableViewColumnPosition(handle, column.id, position);
+//          column.lastPosition = position;
+            newX [index] =  x;
+//          OS.GetDataBrowserTableViewNamedColumnWidth(handle, column.id, width);
+            x += width [0];
+        }
+        TreeColumn[] newColumns = new TreeColumn [columnCount];
+        System.arraycopy (columns, 0, newColumns, 0, columnCount);
+        for (int i=0; i<columnCount; i++) {
+            TreeColumn column = newColumns [i];
+            if (!column.isDisposed ()) {
+                if (newX [i] !is oldX [i]) {
+                    column.sendEvent (DWT.Move);
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Marks the receiver's header as visible if the argument is <code>true</code>,
+ * and marks it invisible otherwise. 
+ * <p>
+ * If one of the receiver's ancestors is not visible or some
+ * other condition makes the receiver not visible, marking
+ * it visible may not actually cause it to be displayed.
+ * </p>
+ *
+ * @param show the new visibility state
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public void setHeaderVisible (bool show) {
+    checkWidget ();
+    ((NSTableView)view).setHeaderView (show ? headerView : null);
+}
+
+/**
+ * Sets the number of root-level items contained in the receiver.
+ *
+ * @param count the number of items
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.2
+ */
+public void setItemCount (int count) {
+    checkWidget ();
+    count = Math.max (0, count);
+    setItemCount (null, count);
+}
+
+void setItemCount (TreeItem parentItem, int count) {
+//  int itemCount = getItemCount (parentItem);
+//  if (count is itemCount) return;
+//  setRedraw (false);
+//  int [] top = new int [1], left = new int [1];
+//    OS.GetDataBrowserScrollPosition (handle, top, left);
+//    DataBrowserCallbacks callbacks = new DataBrowserCallbacks ();
+//  OS.GetDataBrowserCallbacks (handle, callbacks);
+//  callbacks.v1_itemNotificationCallback = 0;
+//  callbacks.v1_itemCompareCallback = 0;
+//  OS.SetDataBrowserCallbacks (handle, callbacks);
+//  int[] ids = parentItem is null ? childIds : parentItem.childIds;
+//  if (count < itemCount) {
+//      for (int index = ids.length - 1; index >= count; index--) {
+//          int id = ids [index];
+//          if (id !is 0) {
+//              TreeItem item = _getItem (id, false);
+//              if (item !is null && !item.isDisposed ()) {
+//                  item.dispose ();
+//              } else {
+//                  if (parentItem is null || parentItem.getExpanded ()) {
+//                      if (OS.RemoveDataBrowserItems (handle, OS.kDataBrowserNoItem, 1, new int [] {id}, 0) !is OS.noErr) {
+//                          error (DWT.ERROR_ITEM_NOT_REMOVED);
+//                          break;
+//                      }
+//                      visibleCount--;
+//                  }
+//              }
+//          }
+//      }
+//      //TODO - move shrink to paint event
+//      // shrink items array
+//      int lastIndex = items.length;
+//      for (int i=items.length; i>0; i--) {
+//          if (items [i-1] !is null) {
+//              lastIndex = i;
+//              break;
+//          }
+//      }
+//      if (lastIndex < items.length - 4) {
+//          int length = Math.max (4, (lastIndex + 3) / 4 * 4);
+//          TreeItem [] newItems = new TreeItem [length];
+//          System.arraycopy(items, 0, newItems, 0, Math.min(items.length, lastIndex));
+//      }
+//  }
+//  
+//  if (parentItem !is null) parentItem.itemCount = count;
+//  int length = Math.max (4, (count + 3) / 4 * 4);
+//  int [] newIds = new int [length];
+//  if (ids !is null) {
+//      System.arraycopy (ids, 0, newIds, 0, Math.min (count, itemCount));
+//  }
+//  ids = newIds;
+//  if (parentItem is null) {
+//      childIds = newIds;
+//  } else {
+//      parentItem.childIds = newIds;
+//  }
+//  
+//  if (count > itemCount) {
+//      if ((getStyle() & DWT.VIRTUAL) is 0) {
+//          int delta = Math.max (4, (count - itemCount + 3) / 4 * 4);
+//          TreeItem [] newItems = new TreeItem [items.length + delta];
+//          System.arraycopy (items, 0, newItems, 0, items.length);
+//          items = newItems;
+//          for (int i=itemCount; i<count; i++) {
+//              items [i] = new TreeItem (this, parentItem, DWT.NONE, i, true);
+//          }
+//      } else {
+//          if (parentItem is null || parentItem.getExpanded ()) {
+//              int parentID = parentItem is null ? OS.kDataBrowserNoItem : parentItem.id;
+//              int [] addIds = _getIds (count - itemCount);
+//              if (OS.AddDataBrowserItems (handle, parentID, addIds.length, addIds, OS.kDataBrowserItemNoProperty) !is OS.noErr) {
+//                  error (DWT.ERROR_ITEM_NOT_ADDED);
+//              }
+//              visibleCount += (count - itemCount);
+//              System.arraycopy (addIds, 0, ids, itemCount, addIds.length);
+//          }
+//      }
+//  }
+//  
+//  callbacks.v1_itemNotificationCallback = display.itemNotificationProc;
+//  callbacks.v1_itemCompareCallback = display.itemCompareProc;
+//  OS.SetDataBrowserCallbacks (handle, callbacks);
+//  setRedraw (true);
+//  if (itemCount is 0 && parentItem !is null) parentItem.redraw (OS.kDataBrowserNoItem);
+}
+
+/*public*/ void setItemHeight (int itemHeight) {
+    checkWidget ();
+    if (itemHeight < -1) error (DWT.ERROR_INVALID_ARGUMENT);
+    if (itemHeight is -1) {
+        //TODO - reset item height, ensure other API's such as setFont don't do this
+    } else {
+//      OS.SetDataBrowserTableViewRowHeight (handle, (short) itemHeight);
+    }
+}
+
+void setItemHeight (Image image) {
+//  Rectangle bounds = image !is null ? image.getBounds () : imageBounds;
+//  if (bounds is null) return;
+//  imageBounds = bounds;
+//  short [] height = new short [1];
+//  if (OS.GetDataBrowserTableViewRowHeight (handle, height) is OS.noErr) {
+//      if (height [0] < bounds.height) {
+//          OS.SetDataBrowserTableViewRowHeight (handle, (short) bounds.height);
+//      }
+//  }
+}
+
+/**
+ * Marks the receiver's lines as visible if the argument is <code>true</code>,
+ * and marks it invisible otherwise. 
+ * <p>
+ * If one of the receiver's ancestors is not visible or some
+ * other condition makes the receiver not visible, marking
+ * it visible may not actually cause it to be displayed.
+ * </p>
+ *
+ * @param show the new visibility state
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.1
+ */
+public void setLinesVisible (bool show) {
+    checkWidget ();
+    ((NSTableView)view).setUsesAlternatingRowBackgroundColors(show);
+}
+
+public void setRedraw (bool redraw) {
+    checkWidget();
+    super.setRedraw (redraw);
+    if (redraw && drawCount is 0) {
+        setScrollWidth (true);
+    }
+}
+
+bool setScrollWidth (TreeItem item) {
+//  if (ignoreRedraw || drawCount !is 0) return false;
+    if (columnCount !is 0) return false;
+//  TreeItem parentItem = item.parentItem;
+//  if (parentItem !is null && !parentItem._getExpanded ()) return false;
+//  GC gc = new GC (this);
+//  int newWidth = item.calculateWidth (0, gc);
+//  gc.dispose ();
+//  newWidth += getInsetWidth (column_id, false);
+//  short [] width = new short [1];
+//  OS.GetDataBrowserTableViewNamedColumnWidth (handle, column_id, width);
+//  if (width [0] < newWidth) {
+//      OS.SetDataBrowserTableViewNamedColumnWidth (handle, column_id, (short) newWidth);
+//      return true;
+//  }
+//  firstColumn.setWidth(400);
+    return false;
+}
+
+bool setScrollWidth (bool set) {
+//  return setScrollWidth(set, childIds, true);
+    return false;
+}
+
+bool setScrollWidth (bool set, int[] childIds, bool recurse) {
+//  if (ignoreRedraw || drawCount !is 0) return false;
+//  if (columnCount !is 0 || childIds is null) return false;
+//  GC gc = new GC (this);
+//  int newWidth = calculateWidth (childIds, gc, recurse, 0, 0);
+//  gc.dispose ();
+//  newWidth += getInsetWidth (column_id, false);
+//  if (!set) {
+//      short [] width = new short [1];
+//      OS.GetDataBrowserTableViewNamedColumnWidth (handle, column_id, width);
+//      if (width [0] >= newWidth) return false;
+//  }
+//  OS.SetDataBrowserTableViewNamedColumnWidth (handle, column_id, (short) newWidth);
+    return true;
+}
+
+/**
+ * Sets the receiver's selection to the given item.
+ * The current selection is cleared before the new item is selected.
+ * <p>
+ * If the item is not in the receiver, then it is ignored.
+ * </p>
+ *
+ * @param item the item to select
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.2
+ */
+public void setSelection (TreeItem item) {
+    checkWidget ();
+    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
+    setSelection (new TreeItem [] {item});
+}
+
+/**
+ * Sets the receiver's selection to be the given array of items.
+ * The current selection is cleared before the new items are selected.
+ * <p>
+ * Items that are not in the receiver are ignored.
+ * If the receiver is single-select and multiple items are specified,
+ * then all items are ignored.
+ * </p>
+ *
+ * @param items the array of items
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the array of items is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if one of the items has been disposed</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Tree#deselectAll()
+ */
+public void setSelection (TreeItem [] items) {
+    checkWidget ();
+    if (items is null) error (DWT.ERROR_NULL_ARGUMENT);
+    deselectAll ();
+//  int length = items.length;
+//  if (length is 0 || ((style & DWT.SINGLE) !is 0 && length > 1)) return;
+//  int count = 0;
+//  int[] ids = new int [length];
+//  for (int i=0; i<length; i++) {
+//      if (items [i] !is null) {
+//          if (items [i].isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+//          ids [count++] = items [i].id;
+//          showItem (items [i], false);
+//      }
+//  }
+//  ignoreSelect = true;
+//  /*
+//  * Bug in the Macintosh.  When the DataBroswer selection flags includes
+//  * both kDataBrowserNeverEmptySelectionSet and kDataBrowserSelectOnlyOne,
+//    * two items are selected when SetDataBrowserSelectedItems() is called
+//    * with kDataBrowserItemsAssign to assign a new seletion despite the fact
+//  * that kDataBrowserSelectOnlyOne was specified.  The fix is to save and
+//  * restore kDataBrowserNeverEmptySelectionSet around each call to
+//  * SetDataBrowserSelectedItems().
+//  */
+//  int [] selectionFlags = null;
+//  if ((style & DWT.SINGLE) !is 0) {
+//      selectionFlags = new int [1];
+//      OS.GetDataBrowserSelectionFlags (handle, selectionFlags);
+//      OS.SetDataBrowserSelectionFlags (handle, selectionFlags [0] & ~OS.kDataBrowserNeverEmptySelectionSet);
+//  }
+//  OS.SetDataBrowserSelectedItems (handle, count, ids, OS.kDataBrowserItemsAssign);
+//  if ((style & DWT.SINGLE) !is 0) {
+//      OS.SetDataBrowserSelectionFlags (handle, selectionFlags [0]);
+//  }
+//  ignoreSelect = false;
+//  if (length > 0) {
+//      int index = -1;
+//      for (int i=0; i<items.length; i++) {
+//          if (items [i] !is null) {
+//              index = i;
+//              break;
+//          }
+//      }
+//      if (index !is -1) showItem (items [index], true);
+//  }
+}
+
+/**
+ * Sets the column used by the sort indicator for the receiver. A null
+ * value will clear the sort indicator.  The current sort column is cleared 
+ * before the new column is set.
+ *
+ * @param column the column used by the sort indicator or <code>null</code>
+ * 
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_ARGUMENT - if the column is disposed</li> 
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.2
+ */
+public void setSortColumn (TreeColumn column) {
+    checkWidget ();
+    if (column !is null && column.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+    if (column is sortColumn) return;
+//  if (column is null) {
+//      if (sortColumn !is null  && !sortColumn.isDisposed ()  && sortDirection !is DWT.NONE) {
+//          OS.SetDataBrowserSortOrder (handle, (short) OS.kDataBrowserOrderIncreasing);
+//          sortColumn = null; 
+//          OS.SetDataBrowserSortProperty (handle, 0);
+//      }
+//  }
+//  sortColumn = column;
+//  if (sortColumn !is null  && !sortColumn.isDisposed () && sortDirection !is DWT.NONE) {
+//      OS.SetDataBrowserSortProperty (handle, sortColumn.id);
+//      int order = sortDirection is DWT.DOWN ? OS.kDataBrowserOrderDecreasing : OS.kDataBrowserOrderIncreasing;
+//      OS.SetDataBrowserSortOrder (handle, (short) order);
+//  }
+}
+
+/**
+ * Sets the direction of the sort indicator for the receiver. The value 
+ * can be one of <code>UP</code>, <code>DOWN</code> or <code>NONE</code>.
+ *
+ * @param direction the direction of the sort indicator 
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ * 
+ * @since 3.2
+ */
+public void setSortDirection  (int direction) {
+    checkWidget ();
+    if (direction !is DWT.UP && direction !is DWT.DOWN && direction !is DWT.NONE) return;
+//  if (direction is sortDirection) return;
+//  sortDirection = direction;
+//  if (sortColumn !is null && !sortColumn.isDisposed ()) {
+//      if (sortDirection is DWT.NONE) {
+//          OS.SetDataBrowserSortOrder (handle, (short) OS.kDataBrowserOrderIncreasing);
+//          TreeColumn column = sortColumn;
+//          sortColumn = null; 
+//          OS.SetDataBrowserSortProperty (handle, 0);
+//          sortColumn = column;
+//      } else {
+//          OS.SetDataBrowserSortProperty (handle, 0);
+//          OS.SetDataBrowserSortProperty (handle, sortColumn.id);
+//          int order = sortDirection is DWT.DOWN ? OS.kDataBrowserOrderDecreasing : OS.kDataBrowserOrderIncreasing;
+//          OS.SetDataBrowserSortOrder (handle, (short) order);
+//      }
+//  }
+}
+
+/**
+ * Sets the item which is currently at the top of the receiver.
+ * This item can change when items are expanded, collapsed, scrolled
+ * or new items are added or removed.
+ *
+ * @param item the item to be shown
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Tree#getTopItem()
+ * 
+ * @since 2.1
+ */
+public void setTopItem (TreeItem item) {
+    checkWidget();
+    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (item.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+//  showItem (item, false);
+//  int columnId = (columnCount is 0) ? column_id : columns [0].id;
+//  OS.RevealDataBrowserItem (handle, item.id, columnId, (byte) OS.kDataBrowserRevealWithoutSelecting);
+//  Rect rect = new Rect ();
+//  if (OS.GetDataBrowserItemPartBounds (handle, item.id, column_id, OS.kDataBrowserPropertyEnclosingPart, rect) is OS.noErr) {
+//      int border = getBorder ();
+//      int [] top = new int [1], left = new int [1];
+//      OS.GetDataBrowserScrollPosition (handle, top, left);
+//      OS.SetDataBrowserScrollPosition (handle, Math.max (0, top [0] + rect.top - border - getHeaderHeight ()), left [0]);
+//  }
+}
+
+/**
+ * Shows the column.  If the column is already showing in the receiver,
+ * this method simply returns.  Otherwise, the columns are scrolled until
+ * the column is visible.
+ *
+ * @param column the column to be shown
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @since 3.1
+ */
+public void showColumn (TreeColumn column) {
+    checkWidget ();
+    if (column is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (column.isDisposed()) error(DWT.ERROR_INVALID_ARGUMENT);
+    if (column.parent !is this) return;
+    int index = indexOf (column);
+    if (columnCount <= 1 || !(0 <= index && index < columnCount)) return;
+    ((NSTableView)view).scrollColumnToVisible(index + ((style & DWT.CHECK) !is 0 ? 1 : 0));
+}
+
+/**
+ * Shows the item.  If the item is already showing in the receiver,
+ * this method simply returns.  Otherwise, the items are scrolled
+ * and expanded until the item is visible.
+ *
+ * @param item the item to be shown
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
+ * </ul>
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Tree#showSelection()
+ */
+public void showItem (TreeItem item) {
+    checkWidget ();
+    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
+    if (item.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
+    showItem (item, true);
+}
+
+void showItem (TreeItem item, bool scroll) {
+    int count = 0;
+//  TreeItem parentItem = item.parentItem;
+//  while (parentItem !is null && !parentItem._getExpanded ()) {
+//      count++;
+//      parentItem = parentItem.parentItem;
+//  }
+//  int index = 0;
+//  parentItem = item.parentItem;
+//  TreeItem [] path = new TreeItem [count];
+//  while (parentItem !is null && !parentItem._getExpanded ()) {
+//      path [index++] = parentItem;
+//      parentItem = parentItem.parentItem;
+//  }
+//  for (int i=path.length-1; i>=0; --i) {
+//      path [i].setExpanded (true);
+//  }
+//  if (scroll) {
+//      /*
+//      * Bug in the Macintosh.  When there is not room to show a
+//      * single item in the data browser, RevealDataBrowserItem()
+//      * scrolls the item such that it is above the top of the data
+//      * browser.  The fix is to remember the index and scroll when
+//      * the data browser is resized.
+//      * 
+//      * Bug in the Macintosh.  When items are added to the data
+//      * browser after is has been hidden, RevealDataBrowserItem()
+//      * when called before the controls behind the data browser
+//      * are repainted causes a redraw.  This redraw happens right
+//      * away causing pixel corruption.  The fix is to remember the
+//      * index and scroll when the data browser is shown.
+//      */
+//      Rectangle rect = getClientArea ();
+//      if (rect.height < getItemHeight () || !OS.IsControlVisible (handle)) {
+//          showItem = item;
+//          return;
+//      }
+//      showItem = null;
+//      Rectangle itemRect = item.getBounds ();
+//      if (!itemRect.isEmpty()) {
+//          if (rect.contains (itemRect.x, itemRect.y)
+//              && rect.contains (itemRect.x, itemRect.y + itemRect.height)) return;
+//      }
+//      int [] top = new int [1], left = new int [1];
+//      OS.GetDataBrowserScrollPosition (handle, top, left);
+//      int columnId = (columnCount is 0) ? column_id : columns [0].id;
+//      int options = OS.kDataBrowserRevealWithoutSelecting;
+//      /*
+//      * This code is intentionally commented, since kDataBrowserRevealAndCenterInView
+//      * does not scroll the item to the center always (it seems to scroll to the
+//      * end in some cases).
+//      */
+//      //options |= OS.kDataBrowserRevealAndCenterInView;
+//      OS.RevealDataBrowserItem (handle, item.id, columnId, (byte) options);
+//      int [] newTop = new int [1], newLeft = new int [1];
+//      if (columnCount is 0) {
+//          bool fixScroll = false;
+//          Rect content = new Rect ();
+//          if (OS.GetDataBrowserItemPartBounds (handle, item.id, columnId, OS.kDataBrowserPropertyContentPart, content) is OS.noErr) {
+//              fixScroll = content.left < rect.x || content.left >= rect.x + rect.width;
+//              if (!fixScroll) {
+//                  GC gc = new GC (this);
+//                  int contentWidth = calculateWidth (new int[]{item.id}, gc, false, 0, 0);
+//                  gc.dispose ();
+//                  fixScroll =  content.left + contentWidth > rect.x + rect.width;
+//              }
+//          }
+//          if (fixScroll) {
+//              int leftScroll = getLeftDisclosureInset (columnId);
+//              int levelIndent = DISCLOSURE_COLUMN_LEVEL_INDENT;
+//              if (OS.VERSION >= 0x1040) {
+//                  float [] metric = new float [1];
+//                  OS.DataBrowserGetMetric (handle, OS.kDataBrowserMetricDisclosureColumnPerDepthGap, null, metric);
+//                  levelIndent = (int) metric [0];
+//              }
+//              TreeItem temp = item;
+//              while (temp.parentItem !is null) {
+//                  leftScroll += levelIndent;
+//                  temp = temp.parentItem;
+//              }
+//              OS.GetDataBrowserScrollPosition (handle, newTop, newLeft);
+//              OS.SetDataBrowserScrollPosition (handle, newTop [0], leftScroll);
+//          }
+//      }
+//
+//      /*
+//      * Bug in the Macintosh.  For some reason, when the DataBrowser is scrolled
+//      * by RevealDataBrowserItem(), the scrollbars are not redrawn.  The fix is to
+//      * force a redraw.
+//      */
+//      OS.GetDataBrowserScrollPosition (handle, newTop, newLeft);
+//      if (horizontalBar !is null && newLeft [0] !is left [0]) horizontalBar.redraw ();
+//      if (verticalBar !is null && newTop [0] !is top [0]) verticalBar.redraw ();
+//  }
+}
+
+/**
+ * Shows the selection.  If the selection is already showing in the receiver,
+ * this method simply returns.  Otherwise, the items are scrolled until
+ * the selection is visible.
+ *
+ * @exception DWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Tree#showItem(TreeItem)
+ */
+public void showSelection () {
+    checkWidget ();
+    //checkItems (false);
+    //TODO - optimize
+    TreeItem [] selection = getSelection ();
+    if (selection.length > 0) showItem (selection [0], true);
+}
+
+}