Source code: org/eclipse/swt/widgets/Tree.java

   /*******************************************************************************
    * Copyright (c) 2000, 2004 IBM Corporation and others.
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the Common Public License v1.0
    * which accompanies this distribution, and is available at
    * http://www.eclipse.org/legal/cpl-v10.html
    * 
    * Contributors:
    *     IBM Corporation - initial API and implementation
   *******************************************************************************/
  package org.eclipse.swt.widgets;
  
  
  import org.eclipse.swt.*;
  import org.eclipse.swt.internal.gtk.*;
  import org.eclipse.swt.graphics.*;
  import org.eclipse.swt.events.*;
  
  /**
   * Instances of this class provide a selectable user interface object
   * that displays a hierarchy of items and issue notificiation when an
   * item in the hierarchy is selected.
   * <p>
   * The item children that may be added to instances of this class
   * must be of type <code>TreeItem</code>.
   * </p><p>
   * Note that although this class is a subclass of <code>Composite</code>,
   * it does not make sense to add <code>Control</code> children to it,
   * or set a layout on it.
   * </p><p>
   * <dl>
   * <dt><b>Styles:</b></dt>
   * <dd>SINGLE, MULTI, CHECK</dd>
   * <dt><b>Events:</b></dt>
   * <dd>Selection, DefaultSelection, Collapse, Expand</dd>
   * </dl>
   * <p>
   * Note: Only one of the styles SINGLE and MULTI may be specified.
   * </p><p>
   * IMPORTANT: This class is <em>not</em> intended to be subclassed.
   * </p>
   */
  public class Tree extends Composite {
    long /*int*/ modelHandle, columnHandle, checkRenderer, pixbufRenderer, textRenderer;
    TreeItem[] items;
    ImageList imageList;
    
    static final int TEXT_COLUMN = 0;
    static final int PIXBUF_COLUMN = 1;
    static final int FOREGROUND_COLUMN = 2;
    static final int BACKGROUND_COLUMN = 3;
    static final int FONT_COLUMN = 4;
    static final int ID_COLUMN = 5;
    static final int CHECKED_COLUMN = 6;
    static final int GRAYED_COLUMN = 7;
    
  /**
   * 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>SWT</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>SWT</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 SWTException <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 SWT#SINGLE
   * @see SWT#MULTI
   * @see SWT#CHECK
   * @see Widget#checkSubclass
   * @see Widget#getStyle
   */
  public Tree (Composite parent, int style) {
    super (parent, checkStyle (style));
  }
  
  static int checkStyle (int style) {
    style |= SWT.H_SCROLL | SWT.V_SCROLL;
    return checkBits (style, SWT.SINGLE, SWT.MULTI, 0, 0, 0, 0);
  }
  
  /**
   * Adds the listener to the collection of listeners who will
   * be notified when the receiver's selection changes, 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 reciever has <code>SWT.CHECK</code> style set and the check selection changes,
  * the event object detail field contains the value <code>SWT.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
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
  * </ul>
  * @exception SWTException <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 == null) error (SWT.ERROR_NULL_ARGUMENT);
   TypedListener typedListener = new TypedListener (listener);
   addListener (SWT.Selection, typedListener);
   addListener (SWT.DefaultSelection, typedListener);
 }
 
 /**
  * Adds the listener to the collection of listeners who will
  * be notified when an item in the receiver is expanded or collapsed
  * by sending it one of the messages defined in the <code>TreeListener</code>
  * interface.
  *
  * @param listener the listener which should be notified
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  *
  * @see TreeListener
  * @see #removeTreeListener
  */
 public void addTreeListener(TreeListener listener) {
   checkWidget ();
   if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
   TypedListener typedListener = new TypedListener (listener);
   addListener (SWT.Expand, typedListener);
   addListener (SWT.Collapse, typedListener);
 }  
 
 public Point computeSize (int wHint, int hHint, boolean changed) {
   checkWidget ();
   if (wHint != SWT.DEFAULT && wHint < 0) wHint = 0;
   if (hHint != SWT.DEFAULT && hHint < 0) hHint = 0;
   Point size = computeNativeSize (handle, wHint, hHint, changed);
   Rectangle trim = computeTrim (0, 0, size.x, size.y);
   size.x = trim.width;
   size.y = trim.height;
   return size;
 }
 
 void createHandle (int index) {
   state |= HANDLE;
   fixedHandle = OS.gtk_fixed_new ();
   if (fixedHandle == 0) error (SWT.ERROR_NO_HANDLES);
   OS.gtk_fixed_set_has_window (fixedHandle, true);
   scrolledHandle = OS.gtk_scrolled_window_new (0, 0);
   if (scrolledHandle == 0) error (SWT.ERROR_NO_HANDLES);
   /*
   * Columns:
   * 0 - text
   * 1 - pixmap
   * 2 - foreground
   * 3 - background
   * 4 - font
   * 5 - id
   * 6 - checked (if needed)
   * 7 - grayed (if needed)
   */
   long /*int*/ [] types = new long /*int*/ [(style & SWT.CHECK) !=0 ? 8 : 6];
   types [TEXT_COLUMN] = OS.G_TYPE_STRING ();
   types [PIXBUF_COLUMN] = OS.GDK_TYPE_PIXBUF ();
   types [FOREGROUND_COLUMN] = OS.GDK_TYPE_COLOR ();
   types [BACKGROUND_COLUMN] = OS.GDK_TYPE_COLOR ();
   types [FONT_COLUMN] = OS.PANGO_TYPE_FONT_DESCRIPTION ();
   types [ID_COLUMN] = OS.G_TYPE_INT ();
   if ((style & SWT.CHECK) != 0) {
     types [CHECKED_COLUMN] = OS.G_TYPE_BOOLEAN (); 
     types [GRAYED_COLUMN] = OS.G_TYPE_BOOLEAN ();
   } 
   modelHandle = OS.gtk_tree_store_newv (types.length, types);
   if (modelHandle == 0) error (SWT.ERROR_NO_HANDLES);
   handle = OS.gtk_tree_view_new_with_model (modelHandle);
   if (handle == 0) error (SWT.ERROR_NO_HANDLES);
   
   /*
   * Bug in ATK. For some reason, ATK segments fault if 
   * the GtkTreeView has a column and does not have items.
   * The fix is to insert the column only when an item is 
   * created.
   */
   columnHandle = OS.gtk_tree_view_column_new ();
   if (columnHandle == 0) error (SWT.ERROR_NO_HANDLES);
   OS.g_object_ref (columnHandle);
   
   if ((style & SWT.CHECK) != 0) {
     checkRenderer = OS.gtk_cell_renderer_toggle_new ();
     if (checkRenderer == 0) error (SWT.ERROR_NO_HANDLES);
     OS.gtk_tree_view_column_pack_start (columnHandle, checkRenderer, false);
     OS.gtk_tree_view_column_add_attribute (columnHandle, checkRenderer, "active", CHECKED_COLUMN);
 
     /*
     * Feature in GTK. The inconsistent property only exists in GTK 2.2.x.
     */
     if (OS.gtk_major_version () > 2 || (OS.gtk_major_version () == 2 && OS.gtk_minor_version () >= 2)) {
       OS.gtk_tree_view_column_add_attribute (columnHandle, checkRenderer, "inconsistent", GRAYED_COLUMN);
     }
   }
   pixbufRenderer = OS.gtk_cell_renderer_pixbuf_new ();
   if (pixbufRenderer == 0) error (SWT.ERROR_NO_HANDLES);
   OS.gtk_tree_view_column_pack_start (columnHandle, pixbufRenderer, false);
   OS.gtk_tree_view_column_add_attribute (columnHandle, pixbufRenderer, "pixbuf", PIXBUF_COLUMN);
   /*
   * Feature on GTK.  When a tree view column contains only one activatable
   * cell renderer such as a toggle renderer, mouse clicks anywhere in a cell
   * activate that renderer. The workaround is to set a second  cell renderer
   * to be activatable.
   */
   if ((style & SWT.CHECK) != 0) {
     OS.g_object_set (pixbufRenderer, OS.mode, OS.GTK_CELL_RENDERER_MODE_ACTIVATABLE, 0);
   }
   textRenderer = OS.gtk_cell_renderer_text_new ();
   if (textRenderer == 0) error (SWT.ERROR_NO_HANDLES);
   OS.gtk_tree_view_column_pack_start (columnHandle, textRenderer, true);
   OS.gtk_tree_view_column_add_attribute (columnHandle, textRenderer, "text", TEXT_COLUMN);
   OS.gtk_tree_view_column_add_attribute (columnHandle, textRenderer, "foreground-gdk", FOREGROUND_COLUMN);
   OS.gtk_tree_view_column_add_attribute (columnHandle, textRenderer, "background-gdk", BACKGROUND_COLUMN);
   OS.gtk_tree_view_column_add_attribute (columnHandle, textRenderer, "font-desc", FONT_COLUMN);
   long /*int*/ parentHandle = parent.parentingHandle ();
   OS.gtk_container_add (parentHandle, fixedHandle);
   OS.gtk_container_add (fixedHandle, scrolledHandle);
   OS.gtk_container_add (scrolledHandle, handle);
   OS.gtk_widget_show (fixedHandle);
   OS.gtk_widget_show (scrolledHandle);
   OS.gtk_widget_show (handle);
 
   int mode = (style & SWT.MULTI) != 0 ? OS.GTK_SELECTION_MULTIPLE : OS.GTK_SELECTION_BROWSE;
   long /*int*/ selectionHandle = OS.gtk_tree_view_get_selection (handle);
   OS.gtk_tree_selection_set_mode (selectionHandle, mode);
   OS.gtk_tree_view_set_headers_visible (handle, false);  
   int hsp = (style & SWT.H_SCROLL) != 0 ? OS.GTK_POLICY_AUTOMATIC : OS.GTK_POLICY_NEVER;
   int vsp = (style & SWT.V_SCROLL) != 0 ? OS.GTK_POLICY_AUTOMATIC : OS.GTK_POLICY_NEVER;
   OS.gtk_scrolled_window_set_policy (scrolledHandle, hsp, vsp);
   if ((style & SWT.BORDER) != 0) OS.gtk_scrolled_window_set_shadow_type (scrolledHandle, OS.GTK_SHADOW_ETCHED_IN);
 }
 
 void createItem (TreeItem item, long /*int*/ iter, int index) {
   long /*int*/ column = OS.gtk_tree_view_get_column (handle, 0);
   if (column == 0) OS.gtk_tree_view_insert_column (handle, columnHandle, 0);
   int count = OS.gtk_tree_model_iter_n_children (modelHandle, iter);
   if (index == -1) index = count;
   if (!(0 <= index && index <= count)) error (SWT.ERROR_INVALID_RANGE);
   int id = 0;
   while (id < items.length && items [id] != null) id++;
   if (id == items.length) {
     TreeItem [] newItems = new TreeItem [items.length + 4];
     System.arraycopy (items, 0, newItems, 0, items.length);
     items = newItems;
   }
   item.handle = OS.g_malloc (OS.GtkTreeIter_sizeof ());
   if (item.handle == 0) error(SWT.ERROR_NO_HANDLES);
   if (index == count) {
     OS.gtk_tree_store_append (modelHandle, item.handle, iter);
   } else {
     OS.gtk_tree_store_insert (modelHandle, item.handle, iter, index);
   }
   OS.gtk_tree_store_set (modelHandle, item.handle, ID_COLUMN, id, -1);
   items [id] = item;
 }
 
 void createWidget (int index) {
   super.createWidget (index);
   items = new TreeItem [4];
 }
 
 GdkColor defaultBackground () {
   return display.COLOR_LIST_BACKGROUND;
 }
 
 GdkColor defaultForeground () {
   return display.COLOR_LIST_FOREGROUND;
 }
 
 void deregister () {
   super.deregister ();
   display.removeWidget (OS.gtk_tree_view_get_selection (handle));
   if (checkRenderer != 0) display.removeWidget (checkRenderer);
 }
 
 /**
  * Deselects all selected items in the receiver.
  *
  * @exception SWTException <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();
   long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
   OS.g_signal_handlers_block_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
   OS.gtk_tree_selection_unselect_all (selection);
   OS.g_signal_handlers_unblock_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
 }
 
 void destroyItem (TreeItem item) {
   /*
   * Bug in GTK.  GTK segment faults when a root tree item
   * is destroyed when the tree is expanded and the last leaf of
   * the root is selected.  This only happens in versions earlier
   * than 2.0.6.  The fix is to collapse the tree item being destroyed
   * when it is a root, before it is destroyed.
   */
   if (OS.gtk_major_version () == 2 && OS.gtk_minor_version () == 0 && OS.gtk_micro_version () < 6) {
     TreeItem [] roots = getItems (0);
     for (int i = 0; i < roots.length; i++) {
       if (item == roots [i]) {
         item.setExpanded (false);
         break;
       }
     }
   }
   int [] index = new int [1];
   releaseItems (item.getItems (), index);
   releaseItem (item, index);
   long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
   OS.g_signal_handlers_block_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
   OS.gtk_tree_store_remove (modelHandle, item.handle);
   OS.g_signal_handlers_unblock_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
   int childCount = OS.gtk_tree_model_iter_n_children (modelHandle, 0);
   if (childCount == 0) removeColumn ();
 }
 
 void destroyWidget () {
   /*
   * Bug in GTK. Sometimes GTK causes a segment fault when a tree widget is
   * destroyed and it has outstanding events or idle handlers.  This only happens
   * on versions earlier than 2.0.5.  The fix is to flush all outstanding events before
   * destroying the widget.
   */
   if (OS.gtk_major_version () == 2 && OS.gtk_minor_version () == 0 && OS.gtk_micro_version () < 5) {
     while (OS.gtk_events_pending () != 0) OS.gtk_main_iteration ();
   }
   super.destroyWidget ();
 }
 
 GdkColor getBackgroundColor () {
   return getBaseColor ();
 }
 
 TreeItem getFocusItem () {
   long /*int*/ [] path = new long /*int*/ [1];
   OS.gtk_tree_view_get_cursor (handle, path, null);
   if (path [0] == 0) return null;
   TreeItem item = null;
   long /*int*/ iter = OS.g_malloc (OS.GtkTreeIter_sizeof ());
   if (OS.gtk_tree_model_get_iter (modelHandle, iter, path [0])) {
     int [] index = new int [1];
     OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
     item = items [index [0]];
   }
   OS.g_free (iter);
   OS.gtk_tree_path_free (path [0]);
   return item;  
 } 
 
 GdkColor getForegroundColor () {
   return getTextColor ();
 }
 
 /**
  * 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.
  *
  * @param point the point used to locate the item
  * @return the item at the given point
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the point is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  */
 public TreeItem getItem (Point point) {
   checkWidget ();
   long /*int*/ [] path = new long /*int*/ [1];  
   OS.gtk_widget_realize (handle);
   if (!OS.gtk_tree_view_get_path_at_pos (handle, point.x, point.y, path, null, null, null)) return null;
   if (path [0] == 0) return null;
   TreeItem item = null;
   long /*int*/ iter = OS.g_malloc (OS.GtkTreeIter_sizeof ());
   if (OS.gtk_tree_model_get_iter (modelHandle, iter, path [0])) {
     boolean overExpander = false;
     if (OS.gtk_tree_model_iter_n_children (modelHandle, iter) > 0) {
       int[] buffer = new int [1];
       GdkRectangle rect = new GdkRectangle ();
       OS.gtk_tree_view_get_cell_area (handle, path [0], columnHandle, rect);
       OS.gtk_widget_style_get (handle, OS.expander_size, buffer, 0);
       int expanderSize = buffer [0] + TreeItem.EXPANDER_EXTRA_PADDING;
       overExpander = rect.x - 1 <= point.x && point.x < rect.x + expanderSize;
     }
     if (!overExpander) {
       int [] index = new int [1];
       OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
       item = items [index [0]];
     }
   }
   OS.g_free (iter);
   OS.gtk_tree_path_free (path [0]);
   return item;
 }
 
 /**
  * Returns the number of items contained in the receiver
  * that are direct item children of the receiver.  The
  * number that is returned is the number of roots in the
  * tree.
  *
  * @return the number of items
  *
  * @exception SWTException <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 OS.gtk_tree_model_iter_n_children (modelHandle, 0);
 }
 
 /**
  * Returns the height of the area which would be used to
  * display <em>one</em> of the items in the tree.
  *
  * @return the height of one item
  *
  * @exception SWTException <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 ();
   int itemCount = OS.gtk_tree_model_iter_n_children (modelHandle, 0);
   if (itemCount == 0) {
     int [] w = new int [1], h = new int [1];
     OS.gtk_tree_view_insert_column (handle, columnHandle, 0);
     OS.gtk_tree_view_column_cell_get_size (columnHandle, null, null, null, w, h);
     OS.gtk_tree_view_remove_column (handle, columnHandle);
     return h [0];
   } else {
     long /*int*/ iter = OS.g_malloc (OS.GtkTreeIter_sizeof ());
     OS.gtk_tree_model_get_iter_first (modelHandle, iter);
     long /*int*/ column = OS.gtk_tree_view_get_column (handle, 0);
     OS.gtk_tree_view_column_cell_set_cell_data (column, modelHandle, iter, false, false);
     int [] w = new int [1], h = new int [1];
     OS.gtk_tree_view_column_cell_get_size (column, null, null, null, w, h);
     OS.g_free (iter);
     return h [0];
   }
 }
 
 /**
  * Returns the items contained in the receiver
  * that are direct item children of the receiver.  These
  * are the roots of the tree.
  * <p>
  * Note: This is not the actual structure used by the receiver
  * to maintain its list of items, so modifying the array will
  * not affect the receiver. 
  * </p>
  *
  * @return the items
  *
  * @exception SWTException <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();
   return getItems (0);
 }
 
 TreeItem [] getItems (long /*int*/ parent) {
   int length = OS.gtk_tree_model_iter_n_children (modelHandle, parent);
   TreeItem[] result = new TreeItem [length];
   if (length == 0) return result;
   int i = 0;
   int[] index = new int [1];
   long /*int*/ iter = OS.g_malloc (OS.GtkTreeIter_sizeof ());
   boolean valid = OS.gtk_tree_model_iter_children (modelHandle, iter, parent);
   while (valid) {
     OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
     result [i++] = items [index [0]];
     valid = OS.gtk_tree_model_iter_next (modelHandle, iter);
   }
   OS.g_free (iter);
   return result;
 }
 
 /**
  * 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 SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  */
 public TreeItem getParentItem () {
   checkWidget ();
   return null;
 }
 
 /**
  * Returns an array of <code>TreeItem</code>s that are currently
  * selected in the receiver. 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 SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  */
 public TreeItem[] getSelection () {
   checkWidget();
   if ((style & SWT.MULTI) != 0) {
     display.treeSelectionLength  = 0;
     display.treeSelection = new int [items.length];
     long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
     OS.gtk_tree_selection_selected_foreach (selection, display.treeSelectionProc, handle);
     TreeItem [] result = new TreeItem [display.treeSelectionLength];
     for (int i=0; i<result.length; i++) result [i] = items [display.treeSelection [i]];
     return result;
   } else {
     long /*int*/ iter = OS.g_malloc (OS.GtkTreeIter_sizeof ());
     long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
     boolean hasSelection = OS.gtk_tree_selection_get_selected (selection, null, iter);
     TreeItem [] result;
     if (hasSelection) {
       int [] index = new int [1];
       OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
       result = new TreeItem []{items [index [0]]};
     } else {
       result = new TreeItem [0];
     }
     OS.g_free (iter);
     return result;
   }
 }
   
 /**
  * Returns the number of selected items contained in the receiver.
  *
  * @return the number of selected items
  *
  * @exception SWTException <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();
   display.treeSelectionLength = 0;
   display.treeSelection = null;
   long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
   OS.gtk_tree_selection_selected_foreach (selection, display.treeSelectionProc, handle);
   return display.treeSelectionLength;
 }
 
 /**
  * Returns the item which is currently at the top of the receiver.
  * This item can change when items are expanded, collapsed, scrolled
  * or new items are added or removed.
  *
  * @return the item at the top of the receiver 
  * 
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  * 
  * @since 2.1
  */
 public TreeItem getTopItem () {
   checkWidget ();
   long /*int*/ [] path = new long /*int*/ [1];
   OS.gtk_widget_realize (handle);
   if (!OS.gtk_tree_view_get_path_at_pos (handle, 1, 1, path, null, null, null)) return null;
   if (path [0] == 0) return null;
   TreeItem item = null;
   long /*int*/ iter = OS.g_malloc (OS.GtkTreeIter_sizeof());
   if (OS.gtk_tree_model_get_iter (modelHandle, iter, path [0])) {
     int [] index = new int [1];
     OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
     item = items [index [0]];
   }
   OS.g_free (iter);
   OS.gtk_tree_path_free (path [0]);
   return item;
 }
 
 long /*int*/ gtk_changed (long /*int*/ widget) {
   TreeItem item = getFocusItem ();
   if (item != null) {
     Event event = new Event ();
     event.item = item; 
     postEvent (SWT.Selection, event);
   }
   return 0;
 }
 
 long /*int*/ gtk_key_press_event (long /*int*/ widget, long /*int*/ eventPtr) {
   long /*int*/ result = super.gtk_key_press_event (widget, eventPtr);
   if (result != 0) return result;
 
   /*
   * Feature in GTK.  When an item is default selected using
   * the return key, GTK does not issue notification. The fix is
   * to issue this notification when the return key is pressed.
   */
   GdkEventKey keyEvent = new GdkEventKey ();
   OS.memmove (keyEvent, eventPtr, GdkEventKey.sizeof);
   int key = keyEvent.keyval;
   switch (key) {
     case OS.GDK_Return:
     case OS.GDK_KP_Enter: {
       Event event = new Event ();
       event.item = getFocusItem (); 
       postEvent (SWT.DefaultSelection, event);
       break;
     }
   }
   return result;
 }
 
 long /*int*/ gtk_row_activated (long /*int*/ tree, long /*int*/ path, long /*int*/ column) {
   if (path == 0) return 0;
   TreeItem item = null;
   long /*int*/ iter = OS.g_malloc (OS.GtkTreeIter_sizeof ());
   if (OS.gtk_tree_model_get_iter (modelHandle, iter, path)) {
     int [] index = new int [1];
     OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
     item = items [index [0]];
   }
   OS.g_free (iter);
   Event event = new Event ();
   event.item = item;
   postEvent (SWT.DefaultSelection, event);
   return 0;
 }
 
 long /*int*/ gtk_test_collapse_row (long /*int*/ tree, long /*int*/ iter, long /*int*/ path) {
   int [] index = new int [1];
   OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
   Event event = new Event ();
   event.item = items [index [0]];
   sendEvent (SWT.Collapse, event);
   if (isDisposed ()) return 0;
   OS.g_signal_handlers_block_matched (handle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, TEST_COLLAPSE_ROW);
   OS.gtk_tree_view_collapse_row (handle, path);
   OS.g_signal_handlers_unblock_matched (handle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, TEST_COLLAPSE_ROW);
   return 1;
 }
 
 long /*int*/ gtk_test_expand_row (long /*int*/ tree, long /*int*/ iter, long /*int*/ path) {
   int [] index = new int [1];
   OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
   Event event = new Event ();
   event.item = items [index [0]];
   sendEvent (SWT.Expand, event);
   if (isDisposed ()) return 0;
   OS.g_signal_handlers_block_matched (handle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, TEST_EXPAND_ROW);
   OS.gtk_tree_view_expand_row (handle, path, false);
   OS.g_signal_handlers_unblock_matched (handle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, TEST_EXPAND_ROW);
   return 1;
 }
 
 long /*int*/ gtk_toggled (long /*int*/ renderer, long /*int*/ pathStr) {
   long /*int*/ path = OS.gtk_tree_path_new_from_string (pathStr);
   if (path == 0) return 0;
   TreeItem item = null;
   long /*int*/ iter = OS.g_malloc (OS.GtkTreeIter_sizeof());
   if (OS.gtk_tree_model_get_iter (modelHandle, iter, path)) {
     int [] index = new int [1];
     OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
     item = items [index [0]];
   }
   OS.g_free (iter);
   OS.gtk_tree_path_free (path);
   item.setChecked (!item.getChecked ());
   Event event = new Event ();
   event.detail = SWT.CHECK;
   event.item = item;
   postEvent (SWT.Selection, event);
   return 0;
 }
 
 long /*int*/ gtk_button_press_event (long /*int*/ widget, long /*int*/ event) {
   long /*int*/ result = super.gtk_button_press_event (widget, event);
   if (result != 0) return result;
   /*
   * Bug in GTK. GTK segments fault, if the GtkTreeView widget is
   * not in focus and all items in the widget are disposed before
   * it finishes processing a button press.  The fix is to give
   * focus to the widget before it starts processing the event.
   */
   if (!OS.GTK_WIDGET_HAS_FOCUS (handle)) {
     OS.gtk_widget_grab_focus (handle);
     // widget may be disposed at this point
     if (isDisposed ()) return 0;
   }
   /*
   * Feature in GTK.  In a multi-select tree view, when multiple items are already
   * selected, the selection state of the item is toggled and the previous selection 
   * is cleared. This is not the desired behaviour when bringing up a popup menu.
   * Also, when an item is reselected with the right button, the tree view issues
   * an unwanted selection event. The workaround is to detect that case and not
   * run the default handler when the item is already part of the current selection.
   */
   GdkEventButton gdkEvent = new GdkEventButton ();
   OS.memmove (gdkEvent, event, GdkEventButton.sizeof);
   int button = gdkEvent.button;
   if (button == 3 && gdkEvent.type == OS.GDK_BUTTON_PRESS) {
     long /*int*/ [] path = new long /*int*/ [1];
     if (OS.gtk_tree_view_get_path_at_pos (handle, (int)gdkEvent.x, (int)gdkEvent.y, path, null, null, null)) {
       if (path [0] != 0) {
         long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
         if (OS.gtk_tree_selection_path_is_selected (selection, path [0])) result = 1;
         OS.gtk_tree_path_free (path [0]);
       }
     }
   }
   
   /*
   * Feature in GTK.  When the user clicks in a single selection GtkTreeView
   * and there are no selected items, the first item is selected automatically
   * before the click is processed, causing two selection events.  The is fix
   * is the set the cursor item to be same as the clicked item to stop the
   * widget from automatically selecting the first item.
   */
   if ((style & SWT.SINGLE) != 0 && getSelectionCount () == 0) {
     long /*int*/ [] path = new long /*int*/ [1];
     if (OS.gtk_tree_view_get_path_at_pos (handle, (int)gdkEvent.x, (int)gdkEvent.y, path, null, null, null)) {
       if (path [0] != 0) {
         long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
         OS.g_signal_handlers_block_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
         OS.gtk_tree_view_set_cursor (handle, path [0], 0, false);
         OS.g_signal_handlers_unblock_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
         OS.gtk_tree_path_free (path [0]);
       }
     }
   }
   
   return result;
 }
   
 void hookEvents () {
   super.hookEvents ();
   long /*int*/ selection = OS.gtk_tree_view_get_selection(handle);
   OS.g_signal_connect_after (selection, OS.changed, display.windowProc2, CHANGED);
   OS.g_signal_connect (handle, OS.row_activated, display.windowProc4, ROW_ACTIVATED);
   OS.g_signal_connect (handle, OS.test_expand_row, display.windowProc4, TEST_EXPAND_ROW);
   OS.g_signal_connect (handle, OS.test_collapse_row, display.windowProc4, TEST_COLLAPSE_ROW);
   if (checkRenderer != 0) {
     OS.g_signal_connect (checkRenderer, OS.toggled, display.windowProc3, TOGGLED);
   }
 }
 
 long /*int*/ paintWindow () {
   OS.gtk_widget_realize (handle);
   return OS.gtk_tree_view_get_bin_window (handle);
 }
 
 void register () {
   super.register ();
   display.addWidget (OS.gtk_tree_view_get_selection (handle), this);
   if (checkRenderer != 0) display.addWidget (checkRenderer, this);
 }
 
 boolean releaseItem (TreeItem item, int [] index) {
   if (item.isDisposed ()) return false;
   OS.gtk_tree_model_get (modelHandle, item.handle, ID_COLUMN, index, -1);
   items [index [0]] = null;
   return true;
 }
 
 void releaseItems (TreeItem [] nodes, int [] index) {
   for (int i=0; i<nodes.length; i++) {
     TreeItem item = nodes [i];
     TreeItem [] sons = item.getItems ();
     if (sons.length != 0) {
       releaseItems (sons, index);
     }
     if (releaseItem (item, index)) {
       item.releaseResources ();
     }
   }
 }
 
 void releaseWidget () {
   for (int i=0; i<items.length; i++) {
     TreeItem item = items [i];
     if (item != null && !item.isDisposed ()) item.releaseResources();
   }
   items = null;
   super.releaseWidget();
   if (modelHandle != 0) OS.g_object_unref (modelHandle);
   modelHandle = 0;
   if (columnHandle != 0) OS.g_object_unref (columnHandle);
   columnHandle = 0;
   if (imageList != null) {
     imageList.dispose ();
     imageList = null;
   }
 }
 
 /**
  * Removes all of the items from the receiver.
  * <p>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  */
 public void removeAll () {
   checkWidget ();
   for (int i=0; i<items.length; i++) {
     TreeItem item = items [i];
     if (item != null && !item.isDisposed ()) item.releaseResources ();
   }
   items = new TreeItem[4];
   long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
   OS.g_signal_handlers_block_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
   OS.gtk_tree_store_clear (modelHandle);
   OS.g_signal_handlers_unblock_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
   removeColumn ();
 }
 
 void removeColumn () {
   long /*int*/ column = OS.gtk_tree_view_get_column (handle, 0);
   if (column == 0) return;
   OS.gtk_tree_view_remove_column (handle, column);
 }
 
 /**
  * Removes the listener from the collection of listeners who will
  * be notified when the receiver's selection changes.
  *
  * @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 SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  *
  * @see SelectionListener
  * @see #addSelectionListener
  */
 public void removeSelectionListener (SelectionListener listener) {
   checkWidget ();
   if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
   eventTable.unhook (SWT.Selection, listener);
   eventTable.unhook (SWT.DefaultSelection, listener);  
 }
 
 /**
  * Removes the listener from the collection of listeners who will
  * be notified when items in the receiver are expanded or collapsed..
  *
  * @param listener the listener which should no longer be notified
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  *
  * @see TreeListener
  * @see #addTreeListener
  */
 public void removeTreeListener(TreeListener listener) {
   checkWidget ();
   if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
   if (eventTable == null) return;
   eventTable.unhook (SWT.Expand, listener);
   eventTable.unhook (SWT.Collapse, listener);
 }
 
 /**
  * Display a mark indicating the point at which an item will be inserted.
  * The drop insert item has a visual hint to show where a dragged item 
  * will be inserted when dropped on the tree.
  * 
  * @param item the insert item.  Null will clear the insertion mark.
  * @param before true places the insert mark above 'item'. false places 
  *  the insert mark below 'item'.
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  */
 public void setInsertMark (TreeItem item, boolean before) {
   checkWidget ();
   if (item == null) {
     OS.gtk_tree_view_unset_rows_drag_dest(handle);
     return;
   }
   if (item.isDisposed()) error (SWT.ERROR_INVALID_ARGUMENT);
   if (item.parent != this) return;
   Rectangle rect = item.getBounds();
   long /*int*/ [] path = new long /*int*/ [1];
   OS.gtk_widget_realize (handle);
   if (!OS.gtk_tree_view_get_path_at_pos(handle, rect.x, rect.y, path, null, null, null)) return;
   if (path [0] == 0) return;
   int position = before ? OS.GTK_TREE_VIEW_DROP_BEFORE : OS.GTK_TREE_VIEW_DROP_AFTER;
   OS.gtk_tree_view_set_drag_dest_row(handle, path[0], position);
   OS.gtk_tree_path_free (path [0]);
 }
 
 /**
  * Selects all of the items in the receiver.
  * <p>
  * If the receiver is single-select, do nothing.
  *
  * @exception SWTException <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 & SWT.SINGLE) != 0) return;
   long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
   OS.g_signal_handlers_block_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
   OS.gtk_tree_selection_select_all (OS.gtk_tree_view_get_selection (handle));
   OS.g_signal_handlers_unblock_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
 }
 
 void setBackgroundColor (GdkColor color) {
   super.setBackgroundColor (color);
   OS.gtk_widget_modify_base (handle, 0, color);
 }
 
 boolean setBounds (int x, int y, int width, int height, boolean move, boolean resize) {
   boolean result = super.setBounds (x, y, width, height, move, resize);
   /*
   * Bug on GTK.  The tree view sometimes does not get a paint
   * event or resizes to a one pixel square when resized in a new
   * shell that is not visible after any event loop has been run.  The
   * problem is intermittent. It doesn't seem to happen the first time
   * a new shell is created. The fix is to ensure the tree view is realized
   * after it has been resized.
   */
   OS.gtk_widget_realize (handle);
   return result;
 }
 
 void setForegroundColor (GdkColor color) {
   super.setForegroundColor (color);
  OS.gtk_widget_modify_text (handle, 0, color);
}

/**
 * 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.
 *
 * @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 SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see Tree#deselectAll()
 */
public void setSelection (TreeItem [] items) {
  checkWidget ();
  if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
  int length = items.length;
  if (length == 0 || ((style & SWT.SINGLE) != 0 && length > 1)) {
    deselectAll ();
    return;
  }
  long /*int*/ selection = OS.gtk_tree_view_get_selection (handle);
  OS.g_signal_handlers_block_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
  OS.gtk_tree_selection_unselect_all (selection);
  boolean first = true;
  for (int i = 0; i < length; i++) {
    TreeItem item = items [i];
    if (item == null) continue;
    if (item.isDisposed ()) break;
    if (item.parent != this) continue;
    long /*int*/ path = OS.gtk_tree_model_get_path (modelHandle, item.handle);
    showItem (path, first);
    OS.gtk_tree_selection_select_iter (selection, item.handle);
    if ((style & SWT.SINGLE) != 0) {
      OS.gtk_tree_view_set_cursor (handle, path, 0, false);
    }
    OS.gtk_tree_path_free (path);
    first = false;
  }
  OS.g_signal_handlers_unblock_matched (selection, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, CHANGED);
}

/**
 * Sets the item which is currently at the top of the receiver.
 * This item can change when items are expanded, collapsed, scrolled
 * or new items are added or removed.
 *
 * @param item the item to be shown
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see Tree#getTopItem()
 * 
 * @since 2.1
 */
public void setTopItem (TreeItem item) {
  if (item == null) error (SWT.ERROR_NULL_ARGUMENT);
  if (item.isDisposed ()) error(SWT.ERROR_INVALID_ARGUMENT);
  if (item.parent != this) return;
  long /*int*/ path = OS.gtk_tree_model_get_path (modelHandle, item.handle);
  showItem (path, false);
  OS.gtk_tree_view_scroll_to_cell (handle, path, 0, true, 0, 0);
  OS.gtk_tree_path_free (path);
}

/**
 * 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 SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see Tree#showItem(TreeItem)
 */
public void showSelection () {
  checkWidget();
  TreeItem [] items = getSelection ();
  if (items.length != 0 && items [0] != null) showItem (items [0]);
}

void showItem (long /*int*/ path, boolean scroll) {
  int depth = OS.gtk_tree_path_get_depth (path);
  if (depth > 1) {
    int [] indices = new int [depth - 1];
    long /*int*/ indicesPtr = OS.gtk_tree_path_get_indices (path);
    OS.memmove (indices, indicesPtr, indices.length * 4);
    long /*int*/ tempPath = OS.gtk_tree_path_new ();
    for (int i=0; i<indices.length; i++) {
      OS.gtk_tree_path_append_index (tempPath, indices [i]);
      OS.gtk_tree_view_expand_row (handle, tempPath, false);
    }
    OS.gtk_tree_path_free (tempPath);    
  }
  if (scroll) {
    GdkRectangle rect = new GdkRectangle ();
    OS.gtk_widget_realize (handle);
    OS.gtk_tree_view_get_cell_area (handle, path, 0, rect);
    boolean isHidden = rect.y == 0 && rect.height == 0;
    if (!isHidden) {
      int [] tx = new int [1], ty = new int [1];
      OS.gtk_tree_view_widget_to_tree_coords (handle, rect.x, rect.y, tx, ty);
      rect.y = ty[0];
      GdkRectangle visRect = new GdkRectangle ();
      OS.gtk_tree_view_get_visible_rect (handle, visRect);
      if (rect.y < visRect.y || rect.y + rect.height > visRect.y + visRect.height) {
        isHidden = true;
      } 
    }
    if (isHidden) OS.gtk_tree_view_scroll_to_cell (handle, path, 0, depth != 1, 0.5f, 0.0f);  
  }
}

/**
 * Shows the item.  If the item is already showing in the receiver,
 * this method simply returns.  Otherwise, the items are scrolled
 * and expanded until the item is visible.
 *
 * @param item the item to be shown
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 * </ul>
 *
 * @see Tree#showSelection()
 */
public void showItem (TreeItem item) {
  checkWidget ();
  if (item == null) error (SWT.ERROR_NULL_ARGUMENT);
  if (item.isDisposed ()) error(SWT.ERROR_INVALID_ARGUMENT);
  if (item.parent != this) return;
  long /*int*/ path = OS.gtk_tree_model_get_path (modelHandle, item.handle);
  showItem (path, true);
  OS.gtk_tree_path_free (path);
}

long /*int*/ treeSelectionProc (long /*int*/ model, long /*int*/ path, long /*int*/ iter, int[] selection, int length) {
  if (selection != null) {
    int [] index = new int [1];
    OS.gtk_tree_model_get (modelHandle, iter, ID_COLUMN, index, -1);
    selection [(int)/*64*/length] = index [0];
  }
  return 0;
}

}