/*******************************************************************************
 * Copyright (c) 2000, 2008 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
 *     
 * Port to the D programming language:
 *     Jacob Carlborg <doob@me.com>
 *******************************************************************************/
module dwt.widgets.Table;

import dwt.dwthelper.utils;

import dwt.DWT;
import dwt.DWTException;
import dwt.accessibility.ACC;
import dwt.events.SelectionEvent;
import dwt.events.SelectionListener;
import dwt.graphics.Color;
import dwt.graphics.Font;
import dwt.graphics.GC;
import dwt.graphics.GCData;
import dwt.graphics.Image;
import dwt.graphics.Point;
import dwt.graphics.Rectangle;
import dwt.internal.cocoa.NSArray;
import dwt.internal.cocoa.NSBezierPath;
import dwt.internal.cocoa.NSBrowserCell;
import dwt.internal.cocoa.NSButtonCell;
import dwt.internal.cocoa.NSColor;
import dwt.internal.cocoa.NSColorSpace;
import dwt.internal.cocoa.NSDictionary;
import dwt.internal.cocoa.NSEvent;
import dwt.internal.cocoa.NSFont;
import dwt.internal.cocoa.NSGraphicsContext;
import dwt.internal.cocoa.NSIndexSet;
import dwt.internal.cocoa.NSMutableIndexSet;
import dwt.internal.cocoa.NSNotification;
import dwt.internal.cocoa.NSNumber;
import dwt.internal.cocoa.NSPoint;
import dwt.internal.cocoa.NSRange;
import dwt.internal.cocoa.NSRect;
import dwt.internal.cocoa.NSScrollView;
import dwt.internal.cocoa.NSSize;
import dwt.internal.cocoa.NSString;
import dwt.internal.cocoa.NSTableColumn;
import dwt.internal.cocoa.NSTableHeaderCell;
import dwt.internal.cocoa.NSTableHeaderView;
import dwt.internal.cocoa.NSTableView;
import dwt.internal.cocoa.NSView;
import dwt.internal.cocoa.OS;
import dwt.internal.cocoa.SWTBrowserCell;
import dwt.internal.cocoa.SWTScrollView;
import dwt.internal.cocoa.SWTTableHeaderCell;
import dwt.internal.cocoa.SWTTableHeaderView;
import dwt.internal.cocoa.SWTTableView;
import cocoa = dwt.internal.cocoa.id;

import Carbon = dwt.internal.c.Carbon;
import dwt.internal.objc.cocoa.Cocoa;
import objc = dwt.internal.objc.runtime;
import dwt.widgets.Composite;
import dwt.widgets.Event;
import dwt.widgets.TableColumn;
import dwt.widgets.TableItem;
import dwt.widgets.TypedListener;

/** 
 * Instances of this class implement a selectable user interface
 * object that displays a list of images and strings and issues
 * notification when selected.
 * <p>
 * The item children that may be added to instances of this class
 * must be of type <code>TableItem</code>.
 * </p><p>
 * Style <code>VIRTUAL</code> is used to create a <code>Table</code> whose
 * <code>TableItem</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
 * tables that are very large or for which <code>TableItem</code> population is
 * expensive (for example, retrieving values from an external source).
 * </p><p>
 * Here is an example of using a <code>Table</code> with style <code>VIRTUAL</code>:
 * <code><pre>
 *  final Table table = new Table (parent, DWT.VIRTUAL | DWT.BORDER);
 *  table.setItemCount (1000000);
 *  table.addListener (DWT.SetData, new Listener () {
 *      public void handleEvent (Event event) {
 *          TableItem item = cast(TableItem) event.item;
 *          int index = table.indexOf (item);
 *          item.setText ("Item " + index);
 *          System.out.println (item.getText ());
 *      }
 *  }); 
 * </pre></code>
 * </p><p>
 * Note that although this class is a subclass of <code>Composite</code>,
 * it does not normally make sense to add <code>Control</code> children to
 * it, or set a layout on it, unless implementing something like a cell
 * editor.
 * </p><p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>SINGLE, MULTI, CHECK, FULL_SELECTION, HIDE_SELECTION, VIRTUAL, NO_SCROLL</dd>
 * <dt><b>Events:</b></dt>
 * <dd>Selection, DefaultSelection, 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>
 *
 * @see <a href="http://www.eclipse.org/swt/snippets/#table">Table, TableItem, TableColumn snippets</a>
 * @see <a href="http://www.eclipse.org/swt/examples.php">DWT Example: ControlExample</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 */
public class Table : Composite {

    alias Composite.computeSize computeSize;
    alias Composite.createHandle createHandle;
    alias Composite.dragDetect dragDetect;
    alias Composite.setBackground setBackground;
    alias Composite.setBounds setBounds;
    alias Composite.setFont setFont;
    alias Composite.setForeground setForeground;

    TableItem [] items;
    TableColumn [] columns;
    TableColumn sortColumn;
    TableItem currentItem;
    NSTableHeaderView headerView;
    NSTableColumn firstColumn, checkColumn;
    NSBrowserCell dataCell;
    int columnCount, itemCount, lastIndexOf, sortDirection;
    bool 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 DWT#FULL_SELECTION
 * @see DWT#HIDE_SELECTION
 * @see DWT#VIRTUAL
 * @see DWT#NO_SCROLL
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public this (Composite parent, int style) {
    super (parent, checkStyle (style));
}

objc.id accessibilityAttributeValue (objc.id id, objc.SEL sel, objc.id arg0) {
    
    if (accessible !is null) {
        NSString attribute = new NSString(arg0);
        cocoa.id returnValue = accessible.internal_accessibilityAttributeValue(attribute, ACC.CHILDID_SELF);
        if (returnValue !is null) return returnValue.id;
    }
    
    NSString attributeName = new NSString(arg0);
    
    // Accessibility Verifier queries for a title or description.  NSTableView doesn't
    // seem to return either, so we return a default description value here.
    if (attributeName.isEqualToString (OS.NSAccessibilityDescriptionAttribute)) {
        return NSString.stringWith("").id;
    }
    
    return super.accessibilityAttributeValue(id, sel, arg0);
}

/**
 * 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);
}

TableItem _getItem (int index) {
    if ((style & DWT.VIRTUAL) is 0) return items [index];
    if (items [index] !is null) return items [index];
    return items [index] = new TableItem (this, DWT.NULL, -1, false);
}

bool checkData (TableItem item, bool redraw) {
    if (item.cached) return true;
    if ((style & DWT.VIRTUAL) !is 0) {
        item.cached = true;
        Event event = new Event ();
        event.item = item;
        event.index = indexOf (item);
        currentItem = item;
        sendEvent (DWT.SetData, event);
        //widget could be disposed at this point
        currentItem = null;
        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);
}

/**
 * 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 table 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
 *
 * @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 3.0
 */
public void clear (int index) {
    checkWidget ();
    if (!(0 <= index && index < itemCount)) error (DWT.ERROR_INVALID_RANGE);
    TableItem item = items [index];
    if (item !is null) {
        item.clear ();
        NSTableView widget = cast(NSTableView) view;
        widget.reloadData ();
    }
}
/**
 * Removes the items from the receiver which are between the given
 * zero-relative start and end indices (inclusive).  The text, icon
 * and other attributes of the items are set to their default values.
 * If the table was created with the <code>DWT.VIRTUAL</code> style,
 * these attributes are requested again as needed.
 *
 * @param start the start index of the item to clear
 * @param end the end index of the item to clear
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if either the start or end are 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 3.0
 */
public void clear (int start, int end) {
    checkWidget ();
    if (start > end) return;
    if (!(0 <= start && start <= end && end < itemCount)) {
        error (DWT.ERROR_INVALID_RANGE);
    }
    if (start is 0 && end is itemCount - 1) {
        clearAll ();
    } else {
        for (int i=start; i<=end; i++) {
            TableItem item = items [i];
            if (item !is null) item.clear ();
        }
        NSTableView widget = cast(NSTableView) view;
        widget.reloadData ();
    }
}

/**
 * Clears the items at the given zero-relative indices in the receiver.
 * The text, icon and other attributes of the items are set to their default
 * values.  If the table was created with the <code>DWT.VIRTUAL</code> style,
 * these attributes are requested again as needed.
 *
 * @param indices the array of indices of the items
 *
 * @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>
 *    <li>ERROR_NULL_ARGUMENT - if the indices array 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 DWT#VIRTUAL
 * @see DWT#SetData
 * 
 * @since 3.0
 */
public void clear (int [] indices) {
    checkWidget ();
    if (indices is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (indices.length is 0) return;
    for (int i=0; i<indices.length; i++) {
        if (!(0 <= indices [i] && indices [i] < itemCount)) {
            error (DWT.ERROR_INVALID_RANGE);
        }
    }
    for (int i=0; i<indices.length; i++) {
        TableItem item = items [indices [i]];
        if (item !is null) item.clear ();
    }
    NSTableView widget = cast(NSTableView) view;
    widget.reloadData ();
}

/**
 * Clears all the items in the receiver. The text, icon and other
 * attributes of the items are set to their default values. If the
 * table was created with the <code>DWT.VIRTUAL</code> style, these
 * attributes are requested again as needed.
 *
 * @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 3.0
 */
public void clearAll () {
    checkWidget ();
    for (int i=0; i<itemCount; i++) {
        TableItem item = items [i];
        if (item !is null) item.clear ();
    }
    NSTableView widget = cast(NSTableView) view;
    widget.reloadData ();
}

public Point computeSize (int wHint, int hHint, bool changed) {
    checkWidget ();
    int width = 0;
    if (wHint is DWT.DEFAULT) {
        if (columnCount !is 0) {
            for (int i=0; i<columnCount; i++) {
                width += columns [i].getWidth ();
            }
        } else {
            int columnWidth = 0;
            GC gc = new GC (this);
            for (int i=0; i<itemCount; i++) {
                TableItem item = items [i];
                if (item !is null) {
                    columnWidth = Math.max (columnWidth, item.calculateWidth (0, gc, false));
                }
            }
            gc.dispose ();
            width += columnWidth + getInsetWidth ();
        }
        if ((style & DWT.CHECK) !is 0) width += getCheckColumnWidth ();
    } else {
        width = wHint;
    }
    if (width <= 0) width = DEFAULT_WIDTH;
    int height = 0;
    if (hHint is DWT.DEFAULT) {
        height = itemCount * getItemHeight () + getHeaderHeight();
    } else {
        height = hHint;
    }
    if (height <= 0) height = DEFAULT_HEIGHT;
    Rectangle rect = computeTrim (0, 0, width, height);
    return new Point (rect.width, rect.height);
}

void createHandle () {
    NSScrollView scrollWidget = cast(NSScrollView)(new SWTScrollView()).alloc();
    scrollWidget.initWithFrame(NSRect ());
    scrollWidget.setHasHorizontalScroller(true);
    scrollWidget.setHasVerticalScroller(true);
    scrollWidget.setAutohidesScrollers(true);
    scrollWidget.setBorderType(hasBorder() ? OS.NSBezelBorder : OS.NSNoBorder);
    
    NSTableView widget = cast(NSTableView)(new SWTTableView()).alloc();
    widget.initWithFrame(NSRect());
    widget.setAllowsMultipleSelection((style & DWT.MULTI) !is 0);
    widget.setAllowsColumnReordering (false);
    widget.setDataSource(widget);
    widget.setDelegate(widget);
    widget.setDoubleAction(OS.sel_sendDoubleSelection);
    if (!hasBorder()) widget.setFocusRingType(OS.NSFocusRingTypeNone);
    
    headerView = cast(NSTableHeaderView)(new SWTTableHeaderView ()).alloc ().init ();
    widget.setHeaderView (null);
    
    NSString str = NSString.stringWith("");
    if ((style & DWT.CHECK) !is 0) {
        checkColumn = cast(NSTableColumn)(new NSTableColumn()).alloc();
        checkColumn.initWithIdentifier(checkColumn);
        checkColumn.headerCell().setTitle(str);
        widget.addTableColumn (checkColumn);
        NSButtonCell cell = cast(NSButtonCell)(new NSButtonCell()).alloc().init();
        checkColumn.setDataCell(cell);
        cell.setButtonType(OS.NSSwitchButton);
        cell.setImagePosition(OS.NSImageOnly);
        cell.setAllowsMixedState(true);
        cell.release();
        checkColumn.setWidth(getCheckColumnWidth());
        checkColumn.setResizingMask(OS.NSTableColumnNoResizing);
        checkColumn.setEditable(false);
    }
    
    firstColumn = cast(NSTableColumn)(new NSTableColumn()).alloc();
    firstColumn.initWithIdentifier(firstColumn);
    firstColumn.setMinWidth(0);
    //column.setResizingMask(OS.NSTableColumnAutoresizingMask);
    dataCell = cast(NSBrowserCell)(new SWTBrowserCell ()).alloc ().init ();
    firstColumn.setDataCell (dataCell);
    widget.addTableColumn (firstColumn);
    
    scrollView = scrollWidget;
    view = widget;
}

void createItem (TableColumn column, int index) {
    if (!(0 <= index && index <= columnCount)) error (DWT.ERROR_INVALID_RANGE);
    if (columnCount is columns.length) {
        TableColumn [] newColumns = new TableColumn [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;
        nsColumn.retain();
        firstColumn = null;
    } else {
        //TODO - set attributes, alignment etc.
        nsColumn = cast(NSTableColumn)(new NSTableColumn()).alloc();
        nsColumn.initWithIdentifier(nsColumn);
        nsColumn.setMinWidth(0);
        int checkColumn = (style & DWT.CHECK) !is 0 ? 1 : 0;
        (cast(NSTableView)view).moveColumn (columnCount + checkColumn, index + checkColumn);
        nsColumn.setDataCell (dataCell);
    }
    column.createJNIRef ();
    NSTableHeaderCell headerCell = cast(NSTableHeaderCell)(new SWTTableHeaderCell ()).alloc ().init ();
    nsColumn.setHeaderCell (headerCell);
    display.addWidget (headerCell, column);
    column.nsColumn = nsColumn;
    nsColumn.setWidth(0);
    System.arraycopy (columns, index, columns, index + 1, columnCount++ - index);
    columns [index] = column;
    if (columnCount > 1) {
        for (int i=0; i<itemCount; i++) {
            TableItem 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;
                }
            }
        }
    } else {
        for (int i = 0; i < itemCount; i++) {
            items [i].customWidth = -1;
        }
    }
}

void createItem (TableItem item, int index) {
    if (!(0 <= index && index <= itemCount)) error (DWT.ERROR_INVALID_RANGE);
    if (itemCount is items.length) {
        /* Grow the array faster when redraw is off */
        int length = drawCount is 0 ? items.length + 4 : Math.max (4, items.length * 3 / 2);
        TableItem [] newItems = new TableItem [length];
        System.arraycopy (items, 0, newItems, 0, items.length);
        items = newItems;
    }
    System.arraycopy (items, index, items, index + 1, itemCount++ - index);
    items [index] = item;
    //TODO - use noteNumberOfRowsChanged?
    (cast(NSTableView)view).reloadData();
}

void createWidget () {
    super.createWidget ();
    items = new TableItem [4];
    columns = new TableColumn [4];
}

Color defaultBackground () {
    return display.getSystemColor (DWT.COLOR_LIST_BACKGROUND);
}

Color defaultForeground () {
    return display.getSystemColor (DWT.COLOR_LIST_FOREGROUND);
}

void deregister () {
    super.deregister ();
    display.removeWidget (headerView);
    display.removeWidget (dataCell);
}

/**
 * Deselects the item at the given zero-relative index in the receiver.
 * If the item at the index was already deselected, it remains
 * deselected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to deselect
 *
 * @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 deselect (int index) {
    checkWidget ();
    if (0 <= index && index < itemCount) {
        NSTableView widget = cast(NSTableView)view;
        ignoreSelect = true;
        widget.deselectRow (index);
        ignoreSelect = false;
    }
}

/**
 * Deselects the items at the given zero-relative indices in the receiver.
 * If the item at the given zero-relative index in the receiver 
 * is selected, it is deselected.  If the item at the index
 * was not selected, it remains deselected.  The range of the
 * indices is inclusive. Indices that are out of range are ignored.
 *
 * @param start the start index of the items to deselect
 * @param end the end index of the items to deselect
 *
 * @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 deselect (int start, int end) {
    checkWidget();
    if (start > end) return;
    if (end < 0 || start >= itemCount) return;
    start = Math.max (0, start);
    end = Math.min (itemCount - 1, end);
    if (start is 0 && end is itemCount - 1) {
        deselectAll ();
    } else {
        NSTableView widget = cast(NSTableView)view;
        ignoreSelect = true;
        for (int i=start; i<=end; i++) {
            widget.deselectRow (i);
        }
        ignoreSelect = false;
    }
}

/**
 * Deselects the items at the given zero-relative indices in the receiver.
 * If the item at the given zero-relative index in the receiver 
 * is selected, it is deselected.  If the item at the index
 * was not selected, it remains deselected. Indices that are out
 * of range and duplicate indices are ignored.
 *
 * @param indices the array of indices for the items to deselect
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the set of indices 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 void deselect (int [] indices) {
    checkWidget ();
    if (indices is null) error (DWT.ERROR_NULL_ARGUMENT);
    NSTableView widget = cast(NSTableView)view;
    ignoreSelect = true;
    for (int i=0; i<indices.length; i++) {
        widget.deselectRow (indices [i]);
    }
    ignoreSelect = false;
}

/**
 * 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 = cast(NSTableView)view;
    ignoreSelect = true;
    widget.deselectAll(null);
    ignoreSelect = false;
}

void destroyItem (TableColumn column) {
    int index = 0;
    while (index < columnCount) {
        if (columns [index] is column) break;
        index++;
    }
    for (int i=0; i<itemCount; i++) {
        TableItem 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;
                }
            }
        }
    }
    
    NSInteger oldIndex = (cast(NSTableView)view).columnWithIdentifier (column.nsColumn);
    
    if (columnCount is 1) {
        //TODO - reset attributes
        firstColumn = column.nsColumn;
        firstColumn.setWidth (0);
    } else {
        (cast(NSTableView)view).removeTableColumn(column.nsColumn);
    }
    System.arraycopy (columns, index + 1, columns, index, --columnCount - index);
    columns [columnCount] = null;
    
    NSArray array = (cast(NSTableView)view).tableColumns ();
    NSUInteger arraySize = array.count ();
    for (NSUInteger i = oldIndex; i < arraySize; i++) {
        objc.id columnId = array.objectAtIndex (i).id;
        for (int j = 0; j < columnCount; j++) {
            if (columns[j].nsColumn.id is columnId) {
                columns [j].sendEvent (DWT.Move);
                break;
            }
        }
    }
}

void destroyItem (TableItem item) {
    int index = 0;
    while (index < itemCount) {
        if (items [index] is item) break;
        index++;
    }
    if (index !is itemCount - 1) fixSelection (index, false); 
    System.arraycopy (items, index + 1, items, index, --itemCount - index);
    items [itemCount] = null;
    (cast(NSTableView)view).noteNumberOfRowsChanged();
    if (itemCount is 0) {
        setTableEmpty ();
    } else {
        //      fixScrollBar ();
    }
}

void drawInteriorWithFrame_inView (objc.id id, objc.SEL sel, objc.id cellFrame, objc.id view) {
    NSRect rect = NSRect ();
    OS.memmove (&rect, cellFrame, NSRect.sizeof);
    
    NSTableView tableView = cast(NSTableView)this.view;
    NSBrowserCell cell = new NSBrowserCell (id);
    NSRange rowsRange = tableView.rowsInRect (rect);
    NSUInteger rowIndex = rowsRange.location;
    TableItem item = items [rowIndex];
    int columnIndex = 0;
    NSUInteger nsColumnIndex = 0;
    if (columnCount !is 0) {
        NSIndexSet columnsSet = tableView.columnIndexesInRect (rect);
        nsColumnIndex = columnsSet.firstIndex ();
        NSArray nsColumns = tableView.tableColumns ();
        cocoa.id nsColumn = nsColumns.objectAtIndex (nsColumnIndex);
        for (int i = 0; i < columnCount; i++) {
            if (columns[i].nsColumn.id is nsColumn.id) {
                columnIndex = indexOf (columns[i]);
                break;
            }
        }
    }
    
    Color background = item.cellBackground !is null ? item.cellBackground [columnIndex] : null;
    if (background is null) background = item.background;
    bool drawBackground = background !is null;
    bool drawForeground = true;
    bool isSelected = tableView.isRowSelected (rowIndex);
    bool drawSelection = isSelected;
    
    NSColor nsSelectionBackground = null;
    NSColor nsSelectionForeground = null;
    if (isSelected) {
        if (isFocusControl ()) {
            nsSelectionForeground = NSColor.alternateSelectedControlTextColor ();
        } else {
            nsSelectionForeground = NSColor.selectedControlTextColor ();
        }
        nsSelectionForeground = nsSelectionForeground.colorUsingColorSpace (NSColorSpace.deviceRGBColorSpace ());
        nsSelectionBackground = cell.highlightColorInView (tableView);
        nsSelectionBackground = nsSelectionBackground.colorUsingColorSpace (NSColorSpace.deviceRGBColorSpace ());
    }
    
    NSRect fullRect = NSRect ();
    fullRect.x = rect.x; fullRect.y = rect.y; fullRect.height = rect.height;
    if (columnCount is 0) {
        if (item.customWidth !is -1) {
            fullRect.width = item.customWidth;
        } else {
            NSSize contentSize = cell.cellSizeForBounds (rect);
            fullRect.width = contentSize.width;
        }
    } else {
        NSSize spacing = tableView.intercellSpacing ();
        fullRect.width = rect.width + spacing.width;
    }
    
    if (hooks (DWT.EraseItem)) {
        NSRect eraseItemRect;
        // TODO how to handle rearranged columns?  The third clause below ensures that
        // there are either 0 columns or that column 0 is still the first physical column.
        if (columnIndex is 0 && (style & DWT.CHECK) !is 0 && (columnCount is 0 || tableView.columnWithIdentifier (columns[0].nsColumn) is 1)) {
            eraseItemRect = NSRect ();
            eraseItemRect.y = fullRect.y;
            eraseItemRect.width = fullRect.x + fullRect.width;
            eraseItemRect.height = fullRect.height;
        } else {
            eraseItemRect = fullRect;
        }
        GCData data = new GCData ();
        data.paintRectStruct = eraseItemRect;
        data.paintRect = &data.paintRectStruct;
        GC gc = GC.cocoa_new (this, data);
        gc.setFont (item.getFont (columnIndex));
        if (isSelected) {
            Carbon.CGFloat[] components = [nsSelectionForeground.numberOfComponents ()];
            nsSelectionForeground.getComponents (components.ptr);   
            Color selectionForeground = Color.cocoa_new (display, components);
            gc.setForeground (selectionForeground);
            components = [nsSelectionBackground.numberOfComponents ()];
            nsSelectionBackground.getComponents (components.ptr);   
            Color selectionBackground = Color.cocoa_new (display, components);
            gc.setBackground (selectionBackground);
        } else {
            gc.setForeground (item.getForeground (columnIndex));
            gc.setBackground (item.getBackground (columnIndex));
        }
        
        Event event = new Event ();
        event.item = item;
        event.gc = gc;
        event.index = columnIndex;
        event.detail = DWT.FOREGROUND;
        if (drawBackground) event.detail |= DWT.BACKGROUND;
        if (isSelected) event.detail |= DWT.SELECTED;
        event.x = cast(int)eraseItemRect.x;
        event.y = cast(int)eraseItemRect.y;
        event.width = cast(int)eraseItemRect.width;
        event.height = cast(int)eraseItemRect.height;
        sendEvent (DWT.EraseItem, event);
        gc.dispose ();
        if (item.isDisposed ()) return;
        if (!event.doit) {
            drawForeground = drawBackground = drawSelection = false; 
        } else {
            drawBackground = drawBackground && (event.detail & DWT.BACKGROUND) !is 0;
            drawForeground = (event.detail & DWT.FOREGROUND) !is 0;
            drawSelection = drawSelection && (event.detail & DWT.SELECTED) !is 0;           
        }
        
        if (drawSelection) {
            NSRect selectionRect = NSRect ();
            selectionRect.y = rect.y; selectionRect.height = rect.height;
            if (columnCount > 0) {
                NSRect columnRect = tableView.rectOfColumn (nsColumnIndex);
                selectionRect.x = columnRect.x; selectionRect.width = columnRect.width;
            } else {
                NSRect rowRect = tableView.rectOfRow (rowIndex);
                if ((style & DWT.CHECK) !is 0) {
                    /* highlighting at this stage draws over the checkbox, so don't include its column */
                    Carbon.CGFloat checkWidth = checkColumn.width ();
                    selectionRect.x = checkWidth;
                    selectionRect.width = rowRect.width - checkWidth;
                } else {
                    selectionRect.width = rowRect.width;
                }
            }
            callSuper (tableView.id, OS.sel_highlightSelectionInClipRect_, selectionRect);
        }   
    }
    
    if (drawBackground && !drawSelection) {
        NSGraphicsContext context = NSGraphicsContext.currentContext ();
        context.saveGraphicsState ();
        Carbon.CGFloat[] colorRGB = background.handle;
        NSColor color = NSColor.colorWithDeviceRed (colorRGB[0], colorRGB[1], colorRGB[2], 1f);
        color.setFill ();
        NSBezierPath.fillRect (fullRect);
        context.restoreGraphicsState ();
    }
    
    if (drawForeground) {
        cell.setHighlighted (false);
        callSuper (id, sel, rect, view);
    }
    
    if (hooks (DWT.PaintItem)) {
        NSRect contentRect = cell.titleRectForBounds (rect);
        NSSize contentSize = cell.cellSizeForBounds (rect);
        
        GCData data = new GCData ();
        // TODO how to handle rearranged columns?  The third clause below ensures that
        // there are either 0 columns or that column 0 is still the first physical column.
        if (columnIndex is 0 && (style & DWT.CHECK) !is 0 && (columnCount is 0 || tableView.columnWithIdentifier (columns[0].nsColumn) is 1)) {
            NSRect gcRect = NSRect ();
            gcRect.y = fullRect.y;
            gcRect.width = fullRect.x + fullRect.width;
            gcRect.height = fullRect.height;
            data.paintRectStruct = gcRect;
            data.paintRect = &data.paintRectStruct;
        } else {
            data.paintRectStruct = fullRect;
            data.paintRect = &data.paintRectStruct;
        }
        GC gc = GC.cocoa_new (this, data);
        gc.setFont (item.getFont (columnIndex));
        if (isSelected) {
            Carbon.CGFloat[] components = [nsSelectionForeground.numberOfComponents ()];
            nsSelectionForeground.getComponents (components.ptr);   
            Color selectionForeground = Color.cocoa_new (display, components);
            gc.setForeground (selectionForeground);
            components = [nsSelectionBackground.numberOfComponents ()];
            nsSelectionBackground.getComponents (components.ptr);   
            Color selectionBackground = Color.cocoa_new (display, components);
            gc.setBackground (selectionBackground);
            gc.setBackground (display.getSystemColor (DWT.COLOR_GREEN));
        } else {
            gc.setForeground (item.getForeground (columnIndex));
            gc.setBackground (item.getBackground (columnIndex));
        }
        
        Event event = new Event ();
        event.item = item;
        event.gc = gc;
        event.index = columnIndex;
        if (isSelected) event.detail |= DWT.SELECTED;
        event.x = cast(int)contentRect.x;
        event.y = cast(int)contentRect.y;
        event.width = cast(int)Math.ceil (contentSize.width);
        event.height = cast(int)Math.ceil (fullRect.height);
        sendEvent (DWT.PaintItem, event);
        gc.dispose ();
    }
}

void fixSelection (int index, bool add) {
    int [] selection = getSelectionIndices ();
    if (selection.length is 0) return;
    int newCount = 0;
    bool fix = false;
    for (int i = 0; i < selection.length; i++) {
        if (!add && selection [i] is index) {
            fix = true;
        } else {
            int newIndex = newCount++;
            selection [newIndex] = selection [i] + 1;
            if (selection [newIndex] - 1 >= index) {
                selection [newIndex] += add ? 1 : -1;
                fix = true;
            }
        }
    }
    if (fix) select (selection, newCount, true);
}

int getCheckColumnWidth () {
    return 20; //TODO - compute width
}

TableColumn getColumn (cocoa.id id) {
    for (int i = 0; i < columnCount; i++) {
        if (columns[i].nsColumn.id is id.id) {
            return columns[i]; 
        }
    }
    return null;
}

/**
 * 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>TableColumn</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 table.
 * This occurs when the programmer uses the table 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 Table#getColumnOrder()
 * @see Table#setColumnOrder(int[])
 * @see TableColumn#getMoveable()
 * @see TableColumn#setMoveable(bool)
 * @see DWT#Move
 */
public TableColumn 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>TableColumn</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 table 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>
 */
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 Table#setColumnOrder(int[])
 * @see TableColumn#getMoveable()
 * @see TableColumn#setMoveable(bool)
 * @see DWT#Move
 * 
 * @since 3.1
 */
public int [] getColumnOrder () {
    checkWidget ();
    int [] order = new int [columnCount];
    for (int i = 0; i < columnCount; i++) {
        TableColumn column = columns [i];
        int index = (cast(NSTableView)view).columnWithIdentifier (column.nsColumn);
        if ((style & DWT.CHECK) !is 0) index -= 1;
        order [index] = i;
    }
    return order;
}

/**
 * Returns an array of <code>TableColumn</code>s which are the
 * columns in the receiver.  Columns are returned in the order
 * that they were created.  If no <code>TableColumn</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 table 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 Table#getColumnOrder()
 * @see Table#setColumnOrder(int[])
 * @see TableColumn#getMoveable()
 * @see TableColumn#setMoveable(bool)
 * @see DWT#Move
 */
public TableColumn [] getColumns () {
    checkWidget ();
    TableColumn [] result = new TableColumn [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>
 */
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 2.0 
 */
public int getHeaderHeight () {
    checkWidget ();
    NSTableHeaderView headerView = (cast(NSTableView)view).headerView();
    if (headerView is null) return 0;
    return cast(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>
 */
public bool getHeaderVisible () {
    checkWidget ();
    return (cast(NSTableView)view).headerView() !is null;
}

int getInsetWidth () {
    //TODO - wrong
    return 20;
}

/**
 * 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>
 */
public TableItem getItem (int index) {
    checkWidget ();
    if (!(0 <= index && index < itemCount)) error (DWT.ERROR_INVALID_RANGE);
    return _getItem (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 TableItem getItem (Point point) {
    checkWidget ();
    NSTableView widget = cast(NSTableView)view;
    NSPoint pt = NSPoint();
    pt.x = point.x;
    pt.y = point.y;
    int row = cast(int)/*64*/widget.rowAtPoint(pt);
    if (row is -1) return null;
    return items[row];
}

/**
 * Returns the number of items contained in the receiver.
 *
 * @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 receiver.
 *
 * @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 cast(int)(cast(NSTableView)view).rowHeight();
}

/**
 * Returns a (possibly empty) array of <code>TableItem</code>s which
 * are the items in the receiver. 
 * <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>
 */
public TableItem [] getItems () {
    checkWidget ();
    TableItem [] result = new TableItem [itemCount];
    if ((style & DWT.VIRTUAL) !is 0) {
        for (int i=0; i<itemCount; i++) {
            result [i] = _getItem (i);
        }
    } else {
        System.arraycopy (items, 0, result, 0, itemCount);
    }
    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>
 */
public bool getLinesVisible () {
    checkWidget ();
    return (cast(NSTableView)view).usesAlternatingRowBackgroundColors();
}

/**
 * Returns an array of <code>TableItem</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 TableItem [] getSelection () {
    checkWidget ();
    NSTableView widget = cast(NSTableView)view;
    if (widget.numberOfSelectedRows() is 0) {
        return new TableItem [0];
    }
    NSIndexSet selection = widget.selectedRowIndexes();
    NSUInteger count = selection.count();
    NSUInteger [] indexBuffer = new NSUInteger [count];
    selection.getIndexes(indexBuffer.ptr, count, null);
    TableItem [] result = new TableItem  [count];
    for (NSUInteger i=0; i<count; i++) {
        result [i] = _getItem (cast(int)/*64*/indexBuffer [i]);
    }
    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 cast(int)/*64*/(cast(NSTableView)view).numberOfSelectedRows();
}

/**
 * Returns the zero-relative index of the item which is currently
 * selected in the receiver, or -1 if no item is selected.
 *
 * @return the index of the selected 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 getSelectionIndex () {
    checkWidget ();
    NSTableView widget = cast(NSTableView)view;
    if (widget.numberOfSelectedRows() is 0) {
        return -1;
    }
    NSIndexSet selection = widget.selectedRowIndexes();
    NSUInteger count = selection.count();
    NSUInteger [] result = new NSUInteger [count];
    selection.getIndexes(result.ptr, count, null);
    return cast(int)/*64*/result [0];
}

/**
 * Returns the zero-relative indices of the items which are currently
 * selected in the receiver. The order of the indices is unspecified.
 * The array is empty if 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 the array of indices of the 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 [] getSelectionIndices () {
    checkWidget ();
    NSTableView widget = cast(NSTableView)view;
    if (widget.numberOfSelectedRows() is 0) {
        return new int [0];
    }
    NSIndexSet selection = widget.selectedRowIndexes();
    NSUInteger count = selection.count();
    NSUInteger [] indices = new NSUInteger [count];
    selection.getIndexes(indices.ptr, count, null);
    int [] result = new int [count];
    for (int i = 0; i < indices.length; i++) {
        result [i] = cast(int)/*64*/indices [i];
    }
    return result;
}

/**
 * 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(TableColumn)
 * 
 * @since 3.2
 */
public TableColumn 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 zero-relative index of the item which is currently
 * at the top of the receiver. This index can change when items are
 * scrolled or new items are added or removed.
 *
 * @return the index of the top 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 getTopIndex () {
    checkWidget ();
    //TODO - partial item at the top
    NSRect rect = scrollView.documentVisibleRect();
    NSPoint point = NSPoint();
    point.x = rect.x;
    point.y = rect.y;
    return cast(int)/*64*/(cast(NSTableView)view).rowAtPoint(point);
}

void highlightSelectionInClipRect(objc.id id, objc.SEL sel, objc.id rect) {
    if (!hooks (DWT.EraseItem)) {
        NSRect clipRect = NSRect ();
        OS.memmove (&clipRect, rect, NSRect.sizeof);
        callSuper (id, sel, clipRect);
    }
}

/**
 * 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>
 */
public int indexOf (TableColumn column) {
    checkWidget ();
    if (column is null) error (DWT.ERROR_NULL_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>
 * </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 int indexOf (TableItem item) {
    checkWidget ();
    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (1 <= lastIndexOf && lastIndexOf < itemCount - 1) {
        if (items [lastIndexOf] is item) return lastIndexOf;
        if (items [lastIndexOf + 1] is item) return ++lastIndexOf;
        if (items [lastIndexOf - 1] is item) return --lastIndexOf;
    }
    if (lastIndexOf < itemCount / 2) {
        for (int i=0; i<itemCount; i++) {
            if (items [i] is item) return lastIndexOf = i;
        }
    } else {
        for (int i=itemCount - 1; i>=0; --i) {
            if (items [i] is item) return lastIndexOf = i;
        }
    }
    return -1;
}

/**
 * Returns <code>true</code> if the item is selected,
 * and <code>false</code> otherwise.  Indices out of
 * range are ignored.
 *
 * @param index the index of the item
 * @return the selection state of the item at the index
 *
 * @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 bool isSelected (int index) {
    checkWidget ();
    if (!(0 <= index && index < itemCount)) return false;
    return (cast(NSTableView)view).isRowSelected(index);
}

bool isTrim (NSView view) {
    if (super.isTrim (view)) return true;
    return view.id is headerView.id;
}

objc.id numberOfRowsInTableView(objc.id  id, objc.SEL sel, objc.id aTableView) {
    return cast(objc.id )itemCount;
}

void register () {
    super.register ();
    display.addWidget (headerView, this);
    display.addWidget (dataCell, this);
}

void releaseChildren (bool destroy) {
    if (items !is null) {
        for (int i=0; i<itemCount; i++) {
            TableItem 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++) {
            TableColumn 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;
    if (dataCell !is null) dataCell.release();
    dataCell = null;
}

void releaseWidget () { 
    super.releaseWidget ();
    currentItem = null;
    sortColumn = null;
}

/**
 * Removes the item from the receiver at the given
 * zero-relative index.
 *
 * @param index the index for the item
 *
 * @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>
 */
public void remove (int index) {
    checkWidget ();
    if (!(0 <= index && index < itemCount)) error (DWT.ERROR_INVALID_RANGE);
    TableItem item = items [index];
    if (item !is null) item.release (false);
    if (index !is itemCount - 1) fixSelection (index, false);
    System.arraycopy (items, index + 1, items, index, --itemCount - index);
    items [itemCount] = null;
    (cast(NSTableView)view).noteNumberOfRowsChanged();
    if (itemCount is 0) {
        setTableEmpty ();
    } else {
        //      fixScrollBar ();
    }
}

/**
 * Removes the items from the receiver which are
 * between the given zero-relative start and end 
 * indices (inclusive).
 *
 * @param start the start of the range
 * @param end the end of the range
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if either the start or end are 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>
 */
public void remove (int start, int end) {
    checkWidget ();
    if (start > end) return;
    if (!(0 <= start && start <= end && end < itemCount)) {
        error (DWT.ERROR_INVALID_RANGE);
    }
    if (start is 0 && end is itemCount - 1) {
        removeAll ();
    } else {
        int length = end - start + 1;
        for (int i=0; i<length; i++) remove (start);
    }
}

/**
 * Removes the items from the receiver's list at the given
 * zero-relative indices.
 *
 * @param indices the array of indices of the items
 *
 * @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>
 *    <li>ERROR_NULL_ARGUMENT - if the indices array 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 void remove (int [] indices) {
    checkWidget ();
    if (indices is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (indices.length is 0) return;
    int [] newIndices = new int [indices.length];
    System.arraycopy (indices, 0, newIndices, 0, indices.length);
    sort (newIndices);
    int start = newIndices [newIndices.length - 1], end = newIndices [0];
    if (!(0 <= start && start <= end && end < itemCount)) {
        error (DWT.ERROR_INVALID_RANGE);
    }
    int last = -1;
    for (int i=0; i<newIndices.length; i++) {
        int index = newIndices [i];
        if (index !is last) {
            remove (index);
            last = index;
        }
    }
}

/**
 * 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<itemCount; i++) {
        TableItem item = items [i];
        if (item !is null && !item.isDisposed ()) item.release (false);
    }
    setTableEmpty ();
    (cast(NSTableView)view).noteNumberOfRowsChanged();
}

/**
 * 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(SelectionListener)
 */
public void removeSelectionListener(SelectionListener listener) {
    checkWidget ();
    if (listener is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (eventTable is null) return;
    eventTable.unhook (DWT.Selection, listener);
    eventTable.unhook (DWT.DefaultSelection,listener);  
}

/**
 * Selects the item at the given zero-relative index in the receiver. 
 * If the item at the index was already selected, it remains
 * selected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to select
 *
 * @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 select (int index) {
    checkWidget ();
    if (0 <= index && index < itemCount) {
        NSIndexSet indexes = cast(NSIndexSet)(new NSIndexSet()).alloc();
        indexes.initWithIndex(index);
        NSTableView widget = cast(NSTableView)view;
        ignoreSelect = true;
        widget.selectRowIndexes(indexes, (style & DWT.MULTI) !is 0);
        ignoreSelect = false;
    }
}

/**
 * Selects the items in the range specified by the given zero-relative
 * indices in the receiver. The range of indices is inclusive.
 * The current selection is not cleared before the new items are selected.
 * <p>
 * If an item in the given range is not selected, it is selected.
 * If an item in the given range was already selected, it remains selected.
 * Indices that are out of range are ignored and no items will be selected
 * if start is greater than end.
 * If the receiver is single-select and there is more than one item in the
 * given range, then all indices are ignored.
 * </p>
 *
 * @param start the start of the range
 * @param end the end of the range
 *
 * @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 Table#setSelection(int,int)
 */
public void select (int start, int end) {
    checkWidget ();
    if (end < 0 || start > end || ((style & DWT.SINGLE) !is 0 && start !is end)) return;
    if (itemCount is 0 || start >= itemCount) return;
    if (start is 0 && end is itemCount - 1) {
        selectAll ();
    } else {
        start = Math.max (0, start);
        end = Math.min (end, itemCount - 1);
        int length = end - start + 1;
        NSIndexSet indexes = cast(NSIndexSet)(new NSIndexSet()).alloc();
        NSRange range = NSRange();
        range.location = start;
        range.length = length;
        indexes.initWithIndexesInRange(range);
        NSTableView widget = cast(NSTableView)view;
        ignoreSelect = true;
        widget.selectRowIndexes(indexes, (style & DWT.MULTI) !is 0);
        ignoreSelect = false;
    }
}

/**
 * Selects the items at the given zero-relative indices in the receiver.
 * The current selection is not cleared before the new items are selected.
 * <p>
 * If the item at a given index is not selected, it is selected.
 * If the item at a given index was already selected, it remains selected.
 * Indices that are out of range and duplicate indices are ignored.
 * If the receiver is single-select and multiple indices are specified,
 * then all indices are ignored.
 * </p>
 *
 * @param indices the array of indices for the items to select
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the array of indices 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 Table#setSelection(int[])
 */
public void select (int [] indices) {
    checkWidget ();
    if (indices is null) error (DWT.ERROR_NULL_ARGUMENT);
    int length = indices.length;
    if (length is 0 || ((style & DWT.SINGLE) !is 0 && length > 1)) return;
    int count = 0;
    NSMutableIndexSet indexes = cast(NSMutableIndexSet)(new NSMutableIndexSet()).alloc().init();
    for (int i=0; i<length; i++) {
        int index = indices [i];
        if (index >= 0 && index < itemCount) {
            indexes.addIndex (indices [i]);
            count++;
        }
    }
    if (count > 0) {
        NSTableView widget = cast(NSTableView)view;
        ignoreSelect = true;
        widget.selectRowIndexes(indexes, (style & DWT.MULTI) !is 0);
        ignoreSelect = false;
    }
}

void select (int [] ids, int count, bool clear) {
    NSMutableIndexSet indexes = cast(NSMutableIndexSet)(new NSMutableIndexSet()).alloc().init();
    for (int i=0; i<count; i++) indexes.addIndex (ids [i] - 1); //WRONG -1
    NSTableView widget = cast(NSTableView)view;
    ignoreSelect = true;
    widget.selectRowIndexes(indexes, !clear);
    ignoreSelect = false;
}

/**
 * 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 = cast(NSTableView)view;
    ignoreSelect = true;
    widget.selectAll(null);
    ignoreSelect = false;
}

void setBackground (Carbon.CGFloat [] color) {
    super.setBackground (color);
    NSColor nsColor;
    if (color is null) {
        nsColor = null;
    } else {
        nsColor = NSColor.colorWithDeviceRed (color [0], color [1], color [2], 1);
    }
    (cast(NSTableView) view).setBackgroundColor (nsColor);
}

/**
 * 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 Table#getColumnOrder()
 * @see TableColumn#getMoveable()
 * @see TableColumn#setMoveable(bool)
 * @see DWT#Move
 * 
 * @since 3.1
 */
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) {
        NSTableView tableView = cast(NSTableView)view;
        int [] oldX = new int [oldOrder.length];
        int check = (style & DWT.CHECK) !is 0 ? 1 : 0;
        for (int i=0; i<oldOrder.length; i++) {
            int index = oldOrder[i];
            oldX [index] = cast(int)tableView.rectOfColumn (i + check).x;
        }
        int [] newX = new int [order.length];
        for (int i=0; i<order.length; i++) {
            int index = order [i];
            TableColumn column = columns[index];
            int oldIndex = tableView.columnWithIdentifier (column.nsColumn);
            int newIndex = i + check;
            tableView.moveColumn (oldIndex, newIndex);
            newX [index] = cast(int)tableView.rectOfColumn (newIndex).x;
        }
        TableColumn[] newColumns = new TableColumn [columnCount];
        System.arraycopy (columns, 0, newColumns, 0, columnCount);
        for (int i=0; i<columnCount; i++) {
            TableColumn column = newColumns [i];
            if (!column.isDisposed ()) {
                if (newX [i] !is oldX [i]) {
                    column.sendEvent (DWT.Move);
                }
            }
        }
    }
}

void setFont(NSFont font) {
    super.setFont (font);
    if (!hooks (DWT.MeasureItem)) {
        float ascent = font.ascender ();
        float descent = -font.descender () + font.leading ();
        (cast(NSTableView)view).setRowHeight (cast(int)Math.ceil (ascent + descent) + 1);
    } else {
        view.setNeedsDisplay (true);
    }
}

/**
 * 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>
 */
public void setHeaderVisible (bool show) {
    checkWidget ();
    (cast(NSTableView)view).setHeaderView (show ? headerView : null);
}

/**
 * Sets the number of 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 3.0
 */
public void setItemCount (int count) {
    checkWidget ();
    count = Math.max (0, count);
    if (count is itemCount) return;
    if (count is itemCount) return;
    TableItem [] children = items;
    if (count < itemCount) {
        for (int index = count; index < itemCount; index ++) {
            TableItem item = children [index];
            if (item !is null && !item.isDisposed()) item.release (false);
        }
    }
    if (count > itemCount) {
        if ((getStyle() & DWT.VIRTUAL) is 0) {
            for (int i=itemCount; i<count; i++) {
                new TableItem (this, DWT.NONE, i, true);
            }
            return;
        } 
    }
    int length = Math.max (4, (count + 3) / 4 * 4);
    TableItem [] newItems = new TableItem [length];
    if (children !is null) {
        System.arraycopy (items, 0, children, 0, Math.min (count, itemCount));
    }
    children = newItems;
    this.items = newItems;
    this.itemCount = count;
    (cast(NSTableView) view).noteNumberOfRowsChanged ();
}

/*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, cast(short) itemHeight);
    }
}

public void setRedraw (bool redraw) {
    checkWidget ();
    super.setRedraw (redraw);
    if (redraw && drawCount is 0) {
        setScrollWidth ();
    }
}

/**
 * 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>
 */
public void setLinesVisible (bool show) {
    checkWidget ();
    (cast(NSTableView)view).setUsesAlternatingRowBackgroundColors(show);
}

bool setScrollWidth () {
    return setScrollWidth (items, true);
}

bool setScrollWidth (TableItem item, bool callMeasureItem) {
    return setScrollWidth ([item], callMeasureItem);
}

bool setScrollWidth (TableItem items[], bool callMeasureItem) {
    if (columnCount !is 0) return false;
    if (currentItem !is null) {
        //      if (currentItem !is item) fixScrollWidth = true;
        return false;
    }
    if (/*ignoreRedraw ||*/ drawCount !is 0) return false;
    int newWidth = 0;
    GC gc = new GC (this);
    for (int i = 0; i < items.length; i++) {
        TableItem item = items[i];
        if (item !is null && !item.isDisposed ()) {
            newWidth = Math.max (newWidth, item.calculateWidth (0, gc, callMeasureItem));
            if (isDisposed ()) {
                gc.dispose ();
                return false;
            }
        }
    }
    gc.dispose ();
    newWidth += getInsetWidth ();
    if (firstColumn.width () < newWidth) {
        NSTableView tableView = cast(NSTableView)view;
        NSTableViewColumnAutoresizingStyle oldResize = tableView.columnAutoresizingStyle ();
        tableView.setColumnAutoresizingStyle (OS.NSTableViewNoColumnAutoresizing);
        firstColumn.setWidth (newWidth);
        tableView.setColumnAutoresizingStyle (oldResize);
        return true;
    }
    return false;
}

/**
 * Selects the item at the given zero-relative index in the receiver. 
 * The current selection is first cleared, then the new item is selected.
 *
 * @param index the index of the item to select
 *
 * @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 Table#deselectAll()
 * @see Table#select(int)
 */
public void setSelection (int index) {
    checkWidget ();
    //TODO - optimize to use expand flag
    deselectAll ();
    setSelection (index, false);
}

void setSelection (int index, bool notify) {
    //  checkWidget ();
    if (0 <= index && index < itemCount) {
        select (index);
        showIndex (index);
        if (notify) {
            Event event = new Event ();
            event.item = _getItem (index);
            postEvent (DWT.Selection, event);
        }
    }
}

/**
 * Selects the items in the range specified by the given zero-relative
 * indices in the receiver. The range of indices is inclusive.
 * The current selection is cleared before the new items are selected.
 * <p>
 * Indices that are out of range are ignored and no items will be selected
 * if start is greater than end.
 * If the receiver is single-select and there is more than one item in the
 * given range, then all indices are ignored.
 * </p>
 * 
 * @param start the start index of the items to select
 * @param end the end index of the items to select
 *
 * @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 Table#deselectAll()
 * @see Table#select(int,int)
 */
public void setSelection (int start, int end) {
    checkWidget ();
    //TODO - optimize to use expand flag
    deselectAll ();
    if (end < 0 || start > end || ((style & DWT.SINGLE) !is 0 && start !is end)) return;
    if (itemCount is 0 || start >= itemCount) return;
    start = Math.max (0, start);
    end = Math.min (end, itemCount - 1);
    select (start, end);
    showIndex (start);
}

/**
 * Selects the items at the given zero-relative indices in the receiver.
 * The current selection is cleared before the new items are selected.
 * <p>
 * Indices that are out of range and duplicate indices are ignored.
 * If the receiver is single-select and multiple indices are specified,
 * then all indices are ignored.
 * </p>
 *
 * @param indices the indices of the items to select
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the array of indices 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 Table#deselectAll()
 * @see Table#select(int[])
 */
public void setSelection (int [] indices) {
    checkWidget ();
    if (indices is null) error (DWT.ERROR_NULL_ARGUMENT);
    //TODO - optimize to use expand flag
    deselectAll ();
    int length = indices.length;
    if (length is 0 || ((style & DWT.SINGLE) !is 0 && length > 1)) return;
    select (indices);
    showIndex (indices [0]);
}

/**
 * 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 (TableItem  item) {
    checkWidget ();
    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
    setSelection ([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 Table#deselectAll()
 * @see Table#select(int[])
 * @see Table#setSelection(int[])
 */
public void setSelection (TableItem [] items) {
    checkWidget ();
    if (items is null) error (DWT.ERROR_NULL_ARGUMENT);
    //TODO - optimize to use expand flag
    deselectAll ();
    int length_ = items.length;
    if (length_ is 0 || ((style & DWT.SINGLE) !is 0 && length_ > 1)) return;
    int [] indices = new int [length_];
    int count = 0;
    for (int i=0; i<length_; i++) {
        int index = indexOf (items [length_ - i - 1]);
        if (index !is -1) {
            indices [count++] = index;
        }
    }
    if (count > 0) {
        select (indices);
        showIndex (indices [0] - 1);
    }
}

/**
 * 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 (TableColumn column) {
    checkWidget ();
    if (column !is null && column.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
    if (column is sortColumn) return;
    TableColumn oldSortColumn = sortColumn;
    sortColumn = column;
    if (sortDirection is DWT.NONE) return;
    NSTableHeaderView headerView = (cast(NSTableView)view).headerView ();
    if (headerView is null) return;
    if (oldSortColumn !is null) {
        NSInteger index = (cast(NSTableView)view).columnWithIdentifier (oldSortColumn.nsColumn);
        NSRect rect = headerView.headerRectOfColumn (index);
        headerView.setNeedsDisplayInRect (rect);
    }
    if (sortColumn !is null) {
        NSInteger index = (cast(NSTableView)view).columnWithIdentifier (sortColumn.nsColumn);
        NSRect rect = headerView.headerRectOfColumn (index);
        headerView.setNeedsDisplayInRect (rect);
    }
}

/**
 * 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) return;
    NSTableHeaderView headerView = (cast(NSTableView)view).headerView ();
    if (headerView is null) return;
    NSInteger index = (cast(NSTableView)view).columnWithIdentifier (sortColumn.nsColumn);
    NSRect rect = headerView.headerRectOfColumn (index);
    headerView.setNeedsDisplayInRect (rect);
}

void setTableEmpty () {
    itemCount = 0;
    items = new TableItem [4];
}

/**
 * Sets the zero-relative index of the item which is currently
 * at the top of the receiver. This index can change when items
 * are scrolled or new items are added and removed.
 *
 * @param index the index of the top 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 void setTopIndex (int index) {
    checkWidget ();
    NSRect rect = (cast(NSTableView)view).rectOfRow(index);
    (cast(NSTableView)view).scrollRectToVisible(rect);
}

/**
 * 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 column is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the column 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 3.0
 */
public void showColumn (TableColumn 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;
    if (columnCount <= 1) return;
    int index = cast(int)/*64*/(cast(NSTableView)view).columnWithIdentifier (column.nsColumn);
    if (!(0 <= index && index < columnCount + ((style & DWT.CHECK) !is 0 ? 1 : 0))) return;
    (cast(NSTableView)view).scrollColumnToVisible (index);
}

void showIndex (int index) {
    if (0 <= index && index < itemCount) {
        (cast(NSTableView)view).scrollRowToVisible(index);
    }
}

/**
 * Shows the item.  If the item is already showing in the receiver,
 * this method simply returns.  Otherwise, the items are scrolled 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 Table#showSelection()
 */
public void showItem (TableItem item) {
    checkWidget ();
    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (item.isDisposed()) error(DWT.ERROR_INVALID_ARGUMENT);
    int index = indexOf (item);
    if (index !is -1) showIndex (index);
}

/**
 * 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 Table#showItem(TableItem)
 */
public void showSelection () {
    checkWidget ();
    int index = getSelectionIndex ();
    if (index >= 0) showIndex (index);
}

void sendDoubleSelection() {
    postEvent (DWT.DefaultSelection);
}

bool sendKeyEvent (NSEvent nsEvent, int type) {
    bool result = super.sendKeyEvent (nsEvent, type);
    if (!result) return result;
    if (type !is DWT.KeyDown) return result;
    ushort keyCode = nsEvent.keyCode ();
    switch (keyCode) {
        case 76: /* KP Enter */
        case 36: { /* Return */
            postEvent (DWT.DefaultSelection);
            break;
        }
    }
    return result;
}

void tableViewColumnDidMove (objc.id id, objc.SEL sel, objc.id aNotification) {
    NSNotification notification = new NSNotification (aNotification);
    NSDictionary userInfo = notification.userInfo ();
    cocoa.id nsOldIndex = userInfo.valueForKey (NSString.stringWith ("NSOldColumn")); //$NON-NLS-1$
    cocoa.id nsNewIndex = userInfo.valueForKey (NSString.stringWith ("NSNewColumn")); //$NON-NLS-1$
    int oldIndex = (new NSNumber (nsOldIndex)).intValue ();
    int newIndex = (new NSNumber (nsNewIndex)).intValue ();
    int startIndex = Math.min (oldIndex, newIndex);
    int endIndex = Math.max (oldIndex, newIndex);
    NSTableView tableView = cast(NSTableView)view;
    NSArray nsColumns = tableView.tableColumns ();
    for (int i = startIndex; i <= endIndex; i++) {
        cocoa.id columnId = nsColumns.objectAtIndex (i);
        TableColumn column = getColumn (columnId);
        if (column !is null) {
            column.sendEvent (DWT.Move);
            if (isDisposed ()) return;
        }
    }
}

void tableViewColumnDidResize (objc.id id, objc.SEL sel, objc.id aNotification) {
    NSNotification notification = new NSNotification (aNotification);
    NSDictionary userInfo = notification.userInfo ();
    cocoa.id columnId = userInfo.valueForKey (NSString.stringWith ("NSTableColumn")); //$NON-NLS-1$
    TableColumn column = getColumn (columnId);
    if (column is null) return; /* either CHECK column or firstColumn in 0-column Table */
    
    column.sendEvent (DWT.Resize);
    if (isDisposed ()) return;
    
    NSTableView tableView = cast(NSTableView)view;
    int index = cast(int)/*64*/tableView.columnWithIdentifier (columnId);
    if (index is -1) return; /* column was disposed in Resize callback */
    
    NSArray nsColumns = tableView.tableColumns ();
    int columnCount = cast(int)/*64*/tableView.numberOfColumns ();
    for (int i = index + 1; i < columnCount; i++) {
        columnId = nsColumns.objectAtIndex (i);
        column = getColumn (columnId);
        if (column !is null) {
            column.sendEvent (DWT.Move);
            if (isDisposed ()) return;
        }
    }
}

void tableViewSelectionDidChange (objc.id id, objc.SEL sel, objc.id aNotification) {
    if (ignoreSelect) return;
    NSTableView widget = cast(NSTableView) view;
    int row = cast(int)/*64*/widget.selectedRow ();
    if(row is -1)
        postEvent (DWT.Selection);
    else {
        TableItem item = _getItem (row);
        Event event = new Event ();
        event.item = item;
        event.index = row;
        postEvent (DWT.Selection, event);
    }
}

void tableView_didClickTableColumn (objc.id id, objc.SEL sel, objc.id tableView, objc.id tableColumn) {
    TableColumn column = getColumn (new cocoa.id (tableColumn));
    column.postEvent (DWT.Selection);
}

objc.id tableView_objectValueForTableColumn_row (objc.id id, objc.SEL sel, objc.id aTableView, objc.id aTableColumn, objc.id rowIndex) {
    TableItem item = _getItem (cast(int)/*64*/rowIndex);
    if (checkColumn !is null && aTableColumn 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 aTableColumn) {
            return item.createString (i).id;
        }
    }
    return item.createString (0).id;
}

void tableView_setObjectValue_forTableColumn_row (objc.id id, objc.SEL sel, objc.id aTableView, objc.id anObject, objc.id aTableColumn, objc.id rowIndex) {
    if (checkColumn !is null && aTableColumn is checkColumn.id)  {
        TableItem item = items [cast(int)/*64*/rowIndex];
        item.checked = !item.checked;
        Event event = new Event ();
        event.detail = DWT.CHECK;
        event.item = item;
        event.index = cast(int)/*64*/rowIndex;
        postEvent (DWT.Selection, event);
        NSTableView tableView = cast(NSTableView)view;
        NSRect rect = tableView.rectOfRow (cast(NSInteger)rowIndex);
        tableView.setNeedsDisplayInRect (rect);
    }
}

bool tableView_shouldEditTableColumn_row (objc.id id, objc.SEL sel, objc.id aTableView, objc.id aTableColumn, objc.id rowIndex) {
    return false;
}

void tableView_willDisplayCell_forTableColumn_row (objc.id id, objc.SEL sel, objc.id aTableView, objc.id aCell, objc.id aTableColumn, objc.id rowIndex) {
    if (checkColumn !is null && aTableColumn is checkColumn.id) return;
    TableItem item = items [cast(int)/*64*/rowIndex];
    Image image = item.image;
    int columnIndex = 0;
    for (int i=0; i<columnCount; i++) {
        if (columns [i].nsColumn.id is aTableColumn) {
            image = item.getImage (i);
            columnIndex = i;
        }
    }
    NSBrowserCell cell = new NSBrowserCell (aCell);
    cell.setFont (item.getFont (columnIndex).handle);
    cell.setImage (image !is null ? image.handle : null);
    cell.setLeaf (true);
    
    if (hooks (DWT.MeasureItem)) {
        NSTableView tableView = cast(NSTableView)this.view;
        NSInteger nsColumnIndex = tableView.columnWithIdentifier (new cocoa.id (aTableColumn));
        NSRect rect = tableView.frameOfCellAtColumn (nsColumnIndex, cast(NSInteger) rowIndex);
        NSRect contentRect = cell.titleRectForBounds (rect);
        NSSize contentSize = cell.cellSizeForBounds (rect);
        
        GCData data = new GCData ();
        data.paintRectStruct = tableView.frame ();
        data.paintRect = &data.paintRectStruct;
        GC gc = GC.cocoa_new (this, data);
        gc.setFont (item.getFont (columnIndex));
        int rowHeight = cast(int)tableView.rowHeight ();
        Event event = new Event ();
        event.item = item;
        event.gc = gc;
        event.index = columnIndex;
        event.x = cast(int)contentRect.x;
        event.y = cast(int)contentRect.y;
        event.width = cast(int)Math.ceil (contentSize.width);
        event.height = rowHeight;
        sendEvent (DWT.MeasureItem, event);
        gc.dispose ();
        if (isDisposed ()) return;
        if (rowHeight < event.height) {
            tableView.setRowHeight(event.height);
        }
        if (columnCount is 0) {
            int change = event.width - (item.customWidth !is -1 ? item.customWidth : cast(int)Math.ceil (contentSize.width));
            if (item.customWidth !is -1 || event.width !is cast(int)Math.ceil (contentSize.width)) {
                item.customWidth = event.width; 
            }
            if (change !is 0) setScrollWidth (item, false);
        }
    }
}
}