/*******************************************************************************
 * 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.TreeItem;

import dwt.dwthelper.utils;


import dwt.DWT;
import dwt.DWTException;
import dwt.graphics.Color;
import dwt.graphics.Font;
import dwt.graphics.GC;
import dwt.graphics.Image;
import dwt.graphics.Rectangle;
import dwt.internal.cocoa.NSAttributedString;
import dwt.internal.cocoa.NSBrowserCell;
import dwt.internal.cocoa.NSColor;
import dwt.internal.cocoa.NSMutableDictionary;
import dwt.internal.cocoa.NSMutableParagraphStyle;
import dwt.internal.cocoa.NSOutlineView;
import dwt.internal.cocoa.NSRect;
import dwt.internal.cocoa.NSSize;
import dwt.internal.cocoa.NSString;
import dwt.internal.cocoa.NSTableColumn;
import dwt.internal.cocoa.OS;
import dwt.internal.cocoa.SWTTreeItem;

import dwt.internal.objc.cocoa.Cocoa;
import dwt.widgets.Event;
import dwt.widgets.Item;
import dwt.widgets.Tree;
import dwt.widgets.TreeColumn;

/**
 * Instances of this class represent a selectable user interface object
 * that represents a hierarchy of tree items in a tree widget.
 * 
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>(none)</dd>
 * <dt><b>Events:</b></dt>
 * <dd>(none)</dd>
 * </dl>
 * <p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 *
 * @see <a href="http://www.eclipse.org/swt/snippets/#tree">Tree, TreeItem, TreeColumn snippets</a>
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 */
public class TreeItem : Item {
    Tree parent;
    TreeItem parentItem;
    TreeItem[] items;
    int itemCount;
    String [] strings;
    Image [] images;
    bool checked, grayed, cached, expanded;
    Color foreground, background;
    Color [] cellForeground, cellBackground;
    Font font;
    Font [] cellFont;
    int customWidth = -1;
    /**
     * the handle to the OS resource 
     * (Warning: This field is platform dependent)
     * <p>
     * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT
     * public API. It is marked public only so that it can be shared
     * within the packages provided by DWT. It is not available on all
     * platforms and should never be accessed from application code.
     * </p>
     */
    //
    SWTTreeItem handle;
    
/**
 * Constructs a new instance of this class given its parent
 * (which must be a <code>Tree</code> or a <code>TreeItem</code>)
 * and a style value describing its behavior and appearance.
 * The item is added to the end of the items maintained by its parent.
 * <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 tree 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
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public this (Tree parent, int style) {
    this (checkNull (parent), null, style, -1, true);
}

/**
 * Constructs a new instance of this class given its parent
 * (which must be a <code>Tree</code> or a <code>TreeItem</code>),
 * a style value describing its behavior and appearance, and the index
 * at which to place it in the items maintained by its parent.
 * <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 tree control which will be the parent of the new instance (cannot be null)
 * @param style the style of control to construct
 * @param index the zero-relative index to store the receiver in its parent
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</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
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public this (Tree parent, int style, int index) {
    this (checkNull (parent), null, style, checkIndex (index), true);
}

/**
 * Constructs a new instance of this class given its parent
 * (which must be a <code>Tree</code> or a <code>TreeItem</code>)
 * and a style value describing its behavior and appearance.
 * The item is added to the end of the items maintained by its parent.
 * <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 parentItem a tree 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
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public this (TreeItem parentItem, int style) {
    this (checkNull (parentItem).parent, parentItem, style, -1, true);
}

/**
 * Constructs a new instance of this class given its parent
 * (which must be a <code>Tree</code> or a <code>TreeItem</code>),
 * a style value describing its behavior and appearance, and the index
 * at which to place it in the items maintained by its parent.
 * <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 parentItem a tree control which will be the parent of the new instance (cannot be null)
 * @param style the style of control to construct
 * @param index the zero-relative index to store the receiver in its parent
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</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
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public this (TreeItem parentItem, int style, int index) {
    this (checkNull (parentItem).parent, parentItem, style, checkIndex (index), true);
}

this (Tree parent, TreeItem parentItem, int style, int index, bool create) {
    super (parent, style);
    this.parent = parent;
    this.parentItem = parentItem;
    if (create) {
        parent.createItem (this, parentItem, index);
    } else {
        handle = cast(SWTTreeItem) (new SWTTreeItem ()).alloc ().init ();
        createJNIRef ();
        register ();
        items = new TreeItem[4];
    }
}

static TreeItem checkNull (TreeItem item) {
    if (item is null) DWT.error (DWT.ERROR_NULL_ARGUMENT);
    return item;
}

static Tree checkNull (Tree parent) {
    if (parent is null) DWT.error (DWT.ERROR_NULL_ARGUMENT);
    return parent;
}

static int checkIndex (int index) {
    if (index < 0) DWT.error (DWT.ERROR_INVALID_RANGE);
    return index;
}

/* note that the result includes tree hierarchy indentation for column 0 */
int calculateWidth (int columnIndex, GC gc, bool recurse, bool callMeasureItem) {
    int width = 0;
    if (!callMeasureItem && customWidth !is -1) {
        width = customWidth;
    } else {
        NSBrowserCell cell = parent.dataCell;
        cell.setFont (getFont (columnIndex).handle);
        cell.setTitle (NSString.stringWith (getText (columnIndex)));
        Image image = getImage (columnIndex);
        cell.setImage (image !is null ? image.handle : null);
        NSRect rect = NSRect ();
        rect.width = rect.height = Float.MAX_VALUE;
        NSSize size = cell.cellSizeForBounds (rect);
        width = cast(int)Math.ceil (size.width);
        
        if (callMeasureItem && parent.hooks (DWT.MeasureItem)) {
            NSOutlineView outlineView = cast(NSOutlineView)parent.view;
            NSInteger nsColumnIndex = 0;
            if (parent.columnCount > 0) {
                nsColumnIndex = outlineView.columnWithIdentifier (parent.columns[columnIndex].nsColumn);
            }
            NSInteger rowIndex = outlineView.rowForItem (handle);
            rect = outlineView.frameOfCellAtColumn (nsColumnIndex, rowIndex);
            NSRect contentRect = cell.titleRectForBounds (rect);
            int rowHeight = cast(int)outlineView.rowHeight ();
            Event event = new Event ();
            event.item = this;
            event.index = columnIndex;
            event.gc = gc;
            event.x = cast(int)contentRect.x;
            event.y = cast(int)contentRect.y;
            event.width = width;
            event.height = rowHeight;
            parent.sendEvent (DWT.MeasureItem, event);
            if (rowHeight < event.height) {
                outlineView.setRowHeight (event.height);
            }
            if (parent.columnCount is 0) {
                int change = event.width - (customWidth !is -1 ? customWidth : width);
                if (customWidth !is -1 || event.width !is width) {
                    customWidth = event.width;  
                }
                if (change !is 0) parent.setScrollWidth (this, false, false);
            }
            width = event.width;
        }
    }
    
    if (columnIndex is 0) {
        NSTableColumn column = parent.columnCount is 0 ? parent.firstColumn : parent.columns[0].nsColumn;
        NSOutlineView outlineView = cast(NSOutlineView)parent.view;
        NSInteger rowIndex = outlineView.rowForItem (handle);
        NSInteger nsColumnIndex = outlineView.columnWithIdentifier (column);
        NSRect columnRect = outlineView.rectOfColumn (nsColumnIndex);
        NSRect cellRect = outlineView.frameOfCellAtColumn (nsColumnIndex, rowIndex);
        width += (cellRect.x - columnRect.x);
    }
    if (recurse && expanded) {
        for (int i = 0; i < items.length; i++) {
            TreeItem item = items [i];
            if (item !is null && !item.isDisposed () && item.cached) {
                width = Math.max (width, item.calculateWidth (columnIndex, gc, recurse, callMeasureItem));
            }
        }
    }
    return width;
}

protected void checkSubclass () {
    if (!isValidSubclass ()) error (DWT.ERROR_INVALID_SUBCLASS);
}

void clear () {
    cached = false;
    text = "";
    image = null;
    strings = null;
    images = null;
    checked = grayed = false;
    foreground = background = null;
    cellForeground = cellBackground = null;
    font = null;
    cellFont = null;
}

/**
 * Clears the item at the given zero-relative index in the receiver.
 * The text, icon and other attributes of the item are set to the default
 * value.  If the tree was created with the <code>DWT.VIRTUAL</code> style,
 * these attributes are requested again as needed.
 *
 * @param index the index of the item to clear
 * @param all <code>true</code> if all child items of the indexed item should be
 * cleared recursively, and <code>false</code> otherwise
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @see DWT#VIRTUAL
 * @see DWT#SetData
 * 
 * @since 3.2
 */
public void clear (int index, bool all) {
    checkWidget ();
    int count = getItemCount ();
    if (index < 0 || index >= count) 
        DWT.error (DWT.ERROR_INVALID_RANGE);
    parent.clear (this, index, all);
}


/**
 * Clears all the items in the receiver. The text, icon and other
 * attributes of the items are set to their default values. If the
 * tree was created with the <code>DWT.VIRTUAL</code> style, these
 * attributes are requested again as needed.
 * 
 * @param all <code>true</code> if all child items should be cleared
 * recursively, and <code>false</code> otherwise
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @see DWT#VIRTUAL
 * @see DWT#SetData
 * 
 * @since 3.2
 */
public void clearAll (bool all) {
    checkWidget ();
    parent.clearAll (this, all);
}

NSAttributedString createString(int index) {
    NSMutableDictionary dict = NSMutableDictionary.dictionaryWithCapacity(4);
    Color foreground = cellForeground !is null ? cellForeground [index] : null;
    if (foreground is null) foreground = this.foreground;
    if (foreground is null) foreground = parent.foreground;
    if (foreground !is null) {
        NSColor color = NSColor.colorWithDeviceRed (foreground.handle [0], foreground.handle [1], foreground.handle [2], 1);
        dict.setObject (color, OS.NSForegroundColorAttributeName);
    }
    Font font = cellFont !is null ? cellFont [index] : null;
    if (font is null) font = this.font;
    if (font is null) font = parent.font;
    if (font !is null) {
        dict.setObject(font.handle, OS.NSFontAttributeName);
    }
    
    NSMutableParagraphStyle paragraphStyle = cast(NSMutableParagraphStyle)(new NSMutableParagraphStyle ()).alloc ().init ();
    paragraphStyle.autorelease ();
    paragraphStyle.setLineBreakMode (OS.NSLineBreakByClipping);
    dict.setObject (paragraphStyle, OS.NSParagraphStyleAttributeName);
    if (parent.columnCount > 0) {
        TreeColumn column = parent.getColumn (index);
        int style = column.getStyle ();
        if ((style & DWT.CENTER) !is 0) {
            paragraphStyle.setAlignment (OS.NSCenterTextAlignment);
        } else if ((style & DWT.RIGHT) !is 0) {
            paragraphStyle.setAlignment (OS.NSRightTextAlignment);
        }
    }
    
    String text = getText (index);
    NSString str = NSString.stringWith(text);
    NSAttributedString attribStr = (cast(NSAttributedString) (new NSAttributedString ()).alloc ()).initWithString (str, dict);
    attribStr.autorelease ();
    return attribStr;
}

void deregister () {
    super.deregister ();
    display.removeWidget (handle);
}

void destroyWidget () {
    parent.destroyItem (this);
    releaseHandle ();
}

/**
 * Returns the receiver's background color.
 *
 * @return the background color
 * 
 * @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 Color getBackground () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    return background !is null ? background : parent.getBackground ();
}

/**
 * Returns the background color at the given column index in the receiver.
 *
 * @param index the column index
 * @return the background color
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public Color getBackground (int index) {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    int count = Math.max (1, parent.columnCount);
    if (0 > index || index > count -1) return getBackground ();
    if (cellBackground is null || cellBackground [index] is null) return getBackground ();
    return cellBackground [index];
}

/**
 * Returns a rectangle describing the receiver's size and location
 * relative to its parent.
 *
 * @return the receiver's bounding rectangle
 *
 * @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 Rectangle getBounds () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    NSRect rect = outlineView.rectOfRow (outlineView.rowForItem (handle));
    return new Rectangle(cast(int) rect.x, cast(int) rect.y, cast(int) rect.width, cast(int) rect.height);
}

/**
 * Returns a rectangle describing the receiver's size and location
 * relative to its parent at a column in the tree.
 *
 * @param index the index that specifies the column
 * @return the receiver's bounding column rectangle
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public Rectangle getBounds (int index) {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    if (!(0 <= index && index < Math.max (1, parent.columnCount))) return new Rectangle (0, 0, 0, 0);
    
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    if (parent.columnCount is 0) {
        index = (parent.style & DWT.CHECK) !is 0 ? 1 : 0;
    } else {
        TreeColumn column = parent.getColumn (index);
        index = cast(int)/*64*/outlineView.columnWithIdentifier (column.nsColumn);
    }
    NSRect rect = outlineView.frameOfCellAtColumn (index, outlineView.rowForItem (handle));
    return new Rectangle (cast(int) rect.x, cast(int) rect.y, cast(int) rect.width, cast(int) rect.height);
}

/**
 * Returns <code>true</code> if the receiver is checked,
 * and false otherwise.  When the parent does not have
 * the <code>CHECK style, return false.
 * <p>
 *
 * @return the checked 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 getChecked () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    if ((parent.style & DWT.CHECK) is 0) return false;
    return checked;
}

/**
 * Returns <code>true</code> if the receiver is expanded,
 * and false otherwise.
 * <p>
 *
 * @return the expanded 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 getExpanded () {
    checkWidget ();
    return expanded;
}

/**
 * Returns the font that the receiver will use to paint textual information for this item.
 *
 * @return the receiver's font
 *
 * @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 Font getFont () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    return font !is null ? font : parent.getFont ();
}

/**
 * Returns the font that the receiver will use to paint textual information
 * for the specified cell in this item.
 *
 * @param index the column index
 * @return the receiver's font
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.1
 */
public Font getFont (int index) {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    int count = Math.max (1, parent.columnCount);
    if (0 > index || index > count -1) return getFont ();
    if (cellFont is null || cellFont [index] is null) return getFont ();
    return cellFont [index];
}

/**
 * Returns the foreground color that the receiver will use to draw.
 *
 * @return the receiver's foreground color
 *
 * @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 Color getForeground () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    return foreground !is null ? foreground : parent.getForeground ();
}

/**
 * 
 * Returns the foreground color at the given column index in the receiver.
 *
 * @param index the column index
 * @return the foreground color
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public Color getForeground (int index) {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    int count = Math.max (1, parent.columnCount);
    if (0 > index || index > count -1) return getForeground ();
    if (cellForeground is null || cellForeground [index] is null) return getForeground ();
    return cellForeground [index];
}

/**
 * Returns <code>true</code> if the receiver is grayed,
 * and false otherwise. When the parent does not have
 * the <code>CHECK style, return false.
 * <p>
 *
 * @return the grayed state of the checkbox
 *
 * @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 getGrayed () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    if ((parent.style & DWT.CHECK) is 0) return false;
    return grayed;
}

public Image getImage () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    return super.getImage ();
}

/**
 * Returns the image stored at the given column index in the receiver,
 * or null if the image has not been set or if the column does not exist.
 *
 * @param index the column index
 * @return the image stored at the given column index 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>
 * 
 * @since 3.1
 */
public Image getImage (int index) {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    if (index is 0) return getImage ();
    if (images !is null) {
        if (0 <= index && index < images.length) return images [index];
    }
    return null;
}

/**
 * Returns a rectangle describing the size and location
 * relative to its parent of an image at a column in the
 * tree.
 *
 * @param index the index that specifies the column
 * @return the receiver's bounding image rectangle
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public Rectangle getImageBounds (int index) {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    if (!(0 <= index && index < Math.max (1, parent.columnCount))) return new Rectangle (0, 0, 0, 0);
    
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    Image image = index is 0 ? this.image : (images !is null) ? images [index] : null;
    if (parent.columnCount is 0) {
        index = (parent.style & DWT.CHECK) !is 0 ? 1 : 0;
    } else {
        TreeColumn column = parent.getColumn (index);
        index = cast(int)/*64*/outlineView.columnWithIdentifier (column.nsColumn);
    }
    NSRect rect = outlineView.frameOfCellAtColumn (index, outlineView.rowForItem (handle));
    //TODO is this right?
    rect.width = image !is null ? image.getBounds().width : 0; 
    return new Rectangle(cast(int) rect.x, cast(int) rect.y, cast(int) rect.width, cast(int) rect.height);
}

/**
 * Returns the item at the given, zero-relative index in the
 * receiver. Throws an exception if the index is out of range.
 *
 * @param index the index of the item to return
 * @return the item at the given index
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public TreeItem getItem (int index) {
    checkWidget ();
    if (index < 0) error (DWT.ERROR_INVALID_RANGE);
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    if (index >= itemCount) error (DWT.ERROR_INVALID_RANGE);
    return parent._getItem (this, index, true);
}

/**
 * Returns the number of items contained in the receiver
 * that are direct item children of 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 ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    return itemCount;
}

/**
 * Returns a (possibly empty) array of <code>TreeItem</code>s which
 * are the direct item children of 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 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>
 */
public TreeItem [] getItems () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    TreeItem [] result = new TreeItem [itemCount];
    for (int i=0; i<itemCount; i++) {
        result [i] = parent._getItem (this, i, true);
    }
    return result;
}

String getNameText () {
    if ((parent.style & DWT.VIRTUAL) !is 0) {
        if (!cached) return "*virtual*"; //$NON-NLS-1$
    }
    return super.getNameText ();
}

/**
 * Returns the receiver's parent, which must be a <code>Tree</code>.
 *
 * @return the receiver's parent
 *
 * @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 Tree getParent () {
    checkWidget ();
    return parent;
}

/**
 * Returns the receiver's parent item, which must be a
 * <code>TreeItem</code> or null when the receiver is a
 * root.
 *
 * @return the receiver's parent item
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 */
public TreeItem getParentItem () {
    checkWidget ();
    return parentItem;
}

public String getText () {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    return super.getText ();
}

/**
 * Returns the text stored at the given column index in the receiver,
 * or empty string if the text has not been set.
 *
 * @param index the column index
 * @return the text stored at the given column index 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>
 * 
 * @since 3.1
 */
public String getText (int index) {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    if (index is 0) return getText ();
    if (strings !is null) {
        if (0 <= index && index < strings.length) {
            String string = strings [index];
            return string !is null ? string : "";
        }
    }
    return "";
}

/**
 * Returns a rectangle describing the size and location
 * relative to its parent of the text at a column in the
 * tree.
 *
 * @param index the index that specifies the column
 * @return the receiver's bounding text rectangle
 *
 * @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 3.3
 */
public Rectangle getTextBounds (int index) {
    checkWidget ();
    if (!parent.checkData (this, true)) error (DWT.ERROR_WIDGET_DISPOSED);
    if (!(0 <= index && index < Math.max (1, parent.columnCount))) return new Rectangle (0, 0, 0, 0);
    
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    Image image = index is 0 ? this.image : (images !is null) ? images [index] : null;
    if (parent.columnCount is 0) {
        index = (parent.style & DWT.CHECK) !is 0 ? 1 : 0;
    } else {
        TreeColumn column = parent.getColumn (index);
        index = cast(int)/*64*/outlineView.columnWithIdentifier (column.nsColumn);
    }
    NSRect rect = outlineView.frameOfCellAtColumn (index, outlineView.rowForItem (handle));
    //TODO is this right?
    if (image !is null) {
        int imageWidth = image.getBounds().width;
        rect.origin.x += imageWidth;
        rect.size.width -= imageWidth;
    }
    return new Rectangle(cast(int) rect.x, cast(int) rect.y, cast(int) rect.width, cast(int) rect.height);
}

/**
 * Searches the receiver's list starting at the first item
 * (index 0) until an item is found that is equal to the 
 * argument, and returns the index of that item. If no item
 * is found, returns -1.
 *
 * @param item the search item
 * @return the index of the item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public int indexOf (TreeItem item) {
    checkWidget ();
    if (item is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (item.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
    if (item.parentItem !is this) return -1;
    for (int i = 0; i < itemCount; i++) {
        if (item is items [i]) return i;
    }
    return -1;
}

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

void releaseChildren (bool destroy) {
    for (int i=0; i<items.length; i++) {
        TreeItem item = items [i];
        if (item !is null && !item.isDisposed ()) {
            item.release (false);
        }
    }
    items = null;
    itemCount = 0;
    super.releaseChildren (destroy);
}

void releaseHandle () {
    super.releaseHandle ();
    if (handle !is null) handle.release ();
    handle = null;
    parentItem = null;
    parent = null;
}

void releaseWidget () {
    super.releaseWidget ();
    strings = null;
    images = null;
    background = foreground = null;
    font = null;
    cellBackground = cellForeground = null;
    cellFont = null;
}

/**
 * Removes all of the items from the receiver.
 * <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>
 *
 * @since 3.1
 */
public void removeAll () {
    checkWidget ();
    //  for (int i=itemCount - 1; i >= 0; i--) {
    //      TreeItem item = parent._getItem (childIds [i], false);
    //      if (item !is null && !item.isDisposed ()) {
    //          item.dispose ();
    //      }
    //  }
}

/**
 * Sets the receiver's background color to the color specified
 * by the argument, or to the default system color for the item
 * if the argument is null.
 *
 * @param color the new color (or null)
 * 
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the argument 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 2.0
 * 
 */
public void setBackground (Color color) {
    checkWidget ();
    if (color !is null && color.isDisposed ()) {
        DWT.error (DWT.ERROR_INVALID_ARGUMENT);
    }
    Color oldColor = background;
    if (oldColor is color) return;
    background = color;
    if (oldColor !is null && oldColor.equals (color)) return;
    cached = true;
    (cast(NSOutlineView) parent.view).reloadItem (handle);
}

/**
 * Sets the background color at the given column index in the receiver 
 * to the color specified by the argument, or to the default system color for the item
 * if the argument is null.
 *
 * @param index the column index
 * @param color the new color (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> 
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 * 
 */
public void setBackground (int index, Color color) {
    checkWidget ();
    if (color !is null && color.isDisposed ()) {
        DWT.error (DWT.ERROR_INVALID_ARGUMENT);
    }
    int count = Math.max (1, parent.columnCount);
    if (0 > index || index > count - 1) return;
    if (cellBackground is null) {
        if (color is null) return;
        cellBackground = new Color [count];
    }
    Color oldColor = cellBackground [index];
    if (oldColor is color) return;
    cellBackground [index] = color;
    if (oldColor !is null && oldColor.equals (color)) return;
    cached = true; 
    
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    if (parent.hooks (DWT.MeasureItem) || parent.hooks (DWT.EraseItem) || parent.hooks (DWT.PaintItem)) {
        outlineView.reloadItem (handle);
    } else {
        if (parent.columnCount is 0) {
            index = (parent.style & DWT.CHECK) !is 0 ? 1 : 0;
        } else {
            TreeColumn column = parent.getColumn (index);
            index = cast(int)/*64*/outlineView.columnWithIdentifier (column.nsColumn);
        }
        NSRect rect = outlineView.frameOfCellAtColumn (index, outlineView.rowForItem (handle));
        outlineView.setNeedsDisplayInRect (rect);
    }
}

/**
 * Sets the checked state of the receiver.
 * <p>
 *
 * @param checked the new checked 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 setChecked (bool checked) {
    checkWidget ();
    if ((parent.style & DWT.CHECK) is 0) return;
    if (this.checked is checked) return;
    this.checked = checked;
    cached = true;
    (cast(NSOutlineView) parent.view).reloadItem (handle);
}

/**
 * Sets the expanded state of the receiver.
 * <p>
 *
 * @param expanded the new expanded 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 setExpanded (bool expanded) {
    checkWidget ();
    if (expanded is getExpanded ()) return;
    parent.ignoreExpand = true;
    this.expanded = expanded;
    if (expanded) {
        (cast(NSOutlineView) parent.view).expandItem (handle);
    } else {
        (cast(NSOutlineView) parent.view).collapseItem (handle);
    }
    parent.ignoreExpand = false;
    cached = true;
    //  if (expanded) {
    //      parent.setScrollWidth (false, childIds, false);
    //  } else {
    //      parent.setScrollWidth (true);
    //      parent.fixScrollBar ();
    //  }
}

/**
 * Sets the font that the receiver will use to paint textual information
 * for this item to the font specified by the argument, or to the default font
 * for that kind of control if the argument is null.
 *
 * @param font the new font (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the argument 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 setFont (Font font) {
    checkWidget ();
    if (font !is null && font.isDisposed ()) {
        DWT.error (DWT.ERROR_INVALID_ARGUMENT);
    }
    Font oldFont = this.font;
    if (oldFont is font) return;
    this.font = font;
    if (oldFont !is null && oldFont.equals (font)) return;
    cached = true;
    (cast(NSOutlineView) parent.view).reloadItem (handle);
}

/**
 * Sets the font that the receiver will use to paint textual information
 * for the specified cell in this item to the font specified by the 
 * argument, or to the default font for that kind of control if the 
 * argument is null.
 *
 * @param index the column index
 * @param font the new font (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> 
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public void setFont (int index, Font font) {
    checkWidget ();
    if (font !is null && font.isDisposed ()) {
        DWT.error (DWT.ERROR_INVALID_ARGUMENT);
    }
    int count = Math.max (1, parent.columnCount);
    if (0 > index || index > count - 1) return;
    if (cellFont is null) {
        if (font is null) return;
        cellFont = new Font [count];
    }
    Font oldFont = this.font;
    if (oldFont is font) return;
    cellFont [index] = font;
    if (oldFont !is null && oldFont.equals (font)) return;
    cached = true;
    
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    if (parent.hooks (DWT.MeasureItem) || parent.hooks (DWT.EraseItem) || parent.hooks (DWT.PaintItem)) {
        outlineView.reloadItem (handle);
    } else {
        if (parent.columnCount is 0) {
            index = (parent.style & DWT.CHECK) !is 0 ? 1 : 0;
        } else {
            TreeColumn column = parent.getColumn (index);
            index = cast(int)/*64*/outlineView.columnWithIdentifier (column.nsColumn);
        }
        NSRect rect = outlineView.frameOfCellAtColumn (index, outlineView.rowForItem (handle));
        outlineView.setNeedsDisplayInRect (rect);
    }
}

/**
 * Sets the receiver's foreground color to the color specified
 * by the argument, or to the default system color for the item
 * if the argument is null.
 *
 * @param color the new color (or null)
 *
 * @since 2.0
 * 
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the argument 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 2.0
 * 
 */
public void setForeground (Color color) {
    checkWidget ();
    if (color !is null && color.isDisposed ()) {
        DWT.error (DWT.ERROR_INVALID_ARGUMENT);
    }
    Color oldColor = foreground;
    if (oldColor is color) return;
    foreground = color;
    if (oldColor !is null && oldColor.equals (color)) return;
    cached = true;
    (cast(NSOutlineView) parent.view).reloadItem (handle);
}

/**
 * Sets the foreground color at the given column index in the receiver 
 * to the color specified by the argument, or to the default system color for the item
 * if the argument is null.
 *
 * @param index the column index
 * @param color the new color (or null)
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the argument has been disposed</li> 
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 * 
 */
public void setForeground (int index, Color color){
    checkWidget ();
    if (color !is null && color.isDisposed ()) {
        DWT.error (DWT.ERROR_INVALID_ARGUMENT);
    }
    int count = Math.max (1, parent.columnCount);
    if (0 > index || index > count - 1) return;
    if (cellForeground is null) {
        if (color is null) return;
        cellForeground = new Color [count];
    }
    Color oldColor = cellForeground [index];
    if (oldColor is color) return;
    cellForeground [index] = color;
    if (oldColor !is null && oldColor.equals (color)) return;
    cached = true;
    
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    if (parent.hooks (DWT.MeasureItem) || parent.hooks (DWT.EraseItem) || parent.hooks (DWT.PaintItem)) {
        outlineView.reloadItem (handle);
    } else {
        if (parent.columnCount is 0) {
            index = (parent.style & DWT.CHECK) !is 0 ? 1 : 0;
        } else {
            TreeColumn column = parent.getColumn (index);
            index = cast(int)/*64*/outlineView.columnWithIdentifier (column.nsColumn);
        }
        NSRect rect = outlineView.frameOfCellAtColumn (index, outlineView.rowForItem (handle));
        outlineView.setNeedsDisplayInRect (rect);
    }
}

/**
 * Sets the grayed state of the checkbox for this item.  This state change 
 * only applies if the Tree was created with the DWT.CHECK style.
 *
 * @param grayed the new grayed state of the checkbox
 *
 * @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 setGrayed (bool grayed) {
    checkWidget ();
    if ((parent.style & DWT.CHECK) is 0) return;
    if (this.grayed is grayed) return;
    this.grayed = grayed;
    cached = true;
    (cast(NSOutlineView) parent.view).reloadItem (handle);
}

/**
 * Sets the image for multiple columns in the tree. 
 * 
 * @param images the array of new images
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the array of images is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if one of the images has been disposed</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public void setImage (Image [] images) {
    checkWidget ();
    if (images is null) error (DWT.ERROR_NULL_ARGUMENT);
    for (int i=0; i<images.length; i++) {
        setImage (i, images [i]);
    }
}

/**
 * Sets the receiver's image at a column.
 *
 * @param index the column index
 * @param image the new image
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public void setImage (int index, Image image) {
    checkWidget ();
    if (image !is null && image.isDisposed ()) {
        error (DWT.ERROR_INVALID_ARGUMENT);
    }
    //  if (parent.imageBounds is null && image !is null) {
    //      parent.setItemHeight (image);
    //  }
    if (index is 0)  {
        if (image !is null && image.type is DWT.ICON) {
            if (image.equals (this.image)) return;
        }
        customWidth = -1;
        super.setImage (image);
    }
    int count = Math.max (1, parent.columnCount);
    if (0 <= index && index < count) {
        if (images is null) images = new Image [count];
        if (image !is null && image.type is DWT.ICON) {
            if (image.equals (images [index])) return;
        }
        images [index] = image; 
    }
    //  cached = true;
    if (index is 0) parent.setScrollWidth (this, false, true);
    
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    if (parent.hooks (DWT.MeasureItem) || parent.hooks (DWT.EraseItem) || parent.hooks (DWT.PaintItem)) {
        outlineView.reloadItem (handle);
    } else {
        if (parent.columnCount is 0) {
            index = (parent.style & DWT.CHECK) !is 0 ? 1 : 0;
        } else {
            TreeColumn column = parent.getColumn (index);
            index = cast(int)/*64*/outlineView.columnWithIdentifier (column.nsColumn);
        }
        NSRect rect = outlineView.frameOfCellAtColumn (index, outlineView.rowForItem (handle));
        outlineView.setNeedsDisplayInRect (rect);
    }
}

public void setImage (Image image) {
    checkWidget ();
    setImage (0, image);
}

/**
 * Sets the number of child items contained in the receiver.
 *
 * @param count the number of items
 *
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @since 3.2
 */
public void setItemCount (int count) {
    checkWidget ();
    count = Math.max (0, count);
    parent.setItemCount (this, count);
}

/**
 * Sets the text for multiple columns in the tree. 
 * 
 * @param strings the array of new strings
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public void setText (String [] strings) {
    checkWidget ();
    if (strings is null) error (DWT.ERROR_NULL_ARGUMENT);
    for (int i=0; i<strings.length; i++) {
        String string = strings [i];
        if (string !is null) setText (i, string);
    }
}

/**
 * Sets the receiver's text at a column
 *
 * @param index the column index
 * @param string the new text
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the text is null</li>
 * </ul>
 * @exception DWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 * 
 * @since 3.1
 */
public void setText (int index, String string) {
    checkWidget ();
    if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
    if (index is 0) {
        if (string.equals (text)) return;
        customWidth = -1;
        super.setText (string);
    }
    int count = Math.max (1, parent.columnCount);
    if (0 <= index && index < count) {
        if (strings is null) strings = new String [count];
        if (string.equals (strings [index])) return;
        strings [index] = string;
    }
    cached = true;
    if (index is 0) parent.setScrollWidth (this, false, true);
    
    NSOutlineView outlineView = cast(NSOutlineView) parent.view;
    if (parent.hooks (DWT.MeasureItem) || parent.hooks (DWT.EraseItem) || parent.hooks (DWT.PaintItem)) {
        outlineView.reloadItem (handle);
    } else {
        if (parent.columnCount is 0) {
            index = (parent.style & DWT.CHECK) !is 0 ? 1 : 0;
        } else {
            TreeColumn column = parent.getColumn (index);
            index = cast(int)/*64*/outlineView.columnWithIdentifier (column.nsColumn);
        }
        NSRect rect = outlineView.frameOfCellAtColumn (index, outlineView.rowForItem (handle));
        outlineView.setNeedsDisplayInRect (rect);
    }
}

public void setText (String string) {
    checkWidget ();
    setText (0, string);
}

}