bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/List.java

package org.eclipse.swt.widgets;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved
 */

import org.eclipse.swt.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;


/** 
 * Instances of this class represent a selectable user interface
 * object that displays a list of strings and issues notificiation
 * when a string selected.  A list may be single or multi select.
 * <p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>SINGLE, MULTI</dd>
 * <dt><b>Events:</b></dt>
 * <dd>Selection, DefaultSelection</dd>
 * </dl>
 * <p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 */

public class List extends Scrollable {
	boolean selected;

/**
 * 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
 * for all SWT widget classes should include a comment which
 * describes the style constants which are applicable to the class.
 * </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
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public List (Composite parent, int style) {
	super (parent, checkStyle (style));
}

/**
 * Adds the argument to the end of the receiver's list.
 *
 * @param string the new item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string 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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_ADDED - if the operation fails because of an operating system failure</li>
 * </ul>
 *
 * @see #add(String,int)
 */
public void add (String string) {
	checkWidget();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	byte [] buffer = Converter.wcsToMbcs (null, string, true);
	int ptr = OS.g_malloc (buffer.length);
	OS.memmove (ptr, buffer, buffer.length);
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	int result = OS.gtk_clist_append (handle, new int [] {ptr});
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
	OS.g_free (ptr);
}

/**
 * Adds the argument to the receiver's list at the given
 * zero-relative index.
 * <p>
 * Note: To add an item at the end of the list, use the
 * result of calling <code>getItemCount()</code> as the
 * index or use <code>add(String)</code>.
 * </p>
 *
 * @param string the new item
 * @param index the index for the item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list (inclusive)</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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_ADDED - if the operation fails because of an operating system failure</li>
 * </ul>
 *
 * @see #add(String)
 */
public void add (String string, int index) {
	checkWidget();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (index == -1) error (SWT.ERROR_ITEM_NOT_ADDED);
	byte [] buffer = Converter.wcsToMbcs (null, string, true);
	int ptr = OS.g_malloc (buffer.length);
	OS.memmove (ptr, buffer, buffer.length);
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	int result = OS.gtk_clist_insert (handle, index, new int [] {ptr});
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
	OS.g_free (ptr);
}

/**
 * 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>
 * <code>widgetSelected</code> is called when the selection changes.
 * <code>widgetDefaultSelected</code> is typically called when an item is double-clicked.
 * </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);
}

static int checkStyle (int style) {
	return checkBits (style, SWT.SINGLE, SWT.MULTI, 0, 0, 0, 0);
}

void createHandle (int index) {
	state |= HANDLE;
	scrolledHandle = OS.gtk_scrolled_window_new (0, 0);
	if (scrolledHandle == 0) error (SWT.ERROR_NO_HANDLES);
	handle = OS.gtk_clist_new (1);
	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
}

void setHandleStyle() {
	int selectionMode = ((style & SWT.MULTI) != 0)?
		OS.GTK_SELECTION_EXTENDED :
		OS.GTK_SELECTION_BROWSE;
	OS.gtk_clist_set_selection_mode (handle, selectionMode);
	
	int border = OS.GTK_SHADOW_NONE;
	if ((style&SWT.BORDER)!=0) {
		border = OS.GTK_SHADOW_ETCHED_IN;
		if ((style&SWT.SHADOW_IN)!=0) border = OS.GTK_SHADOW_IN;
		if ((style&SWT.SHADOW_OUT)!=0) border = OS.GTK_SHADOW_OUT;
		if ((style&SWT.SHADOW_ETCHED_IN)!=0) border = OS.GTK_SHADOW_ETCHED_IN;
		if ((style&SWT.SHADOW_ETCHED_OUT)!=0) border = OS.GTK_SHADOW_ETCHED_OUT;
	}
	OS.gtk_clist_set_shadow_type(handle, border);
	setScrollingPolicy();
}

void configure() {
	_connectParent();
	OS.gtk_container_add (scrolledHandle, handle);
}

void hookEvents () {
	//TO DO - get rid of enter/exit for mouse crossing border
	super.hookEvents();
	signal_connect (handle, "select_row", SWT.Selection, 5);
	signal_connect (handle, "unselect_row", SWT.Selection, 5);
}

void showHandle() {
	OS.gtk_widget_show (scrolledHandle);
	OS.gtk_widget_show (handle);
	OS.gtk_widget_realize (handle);
}

public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	if (wHint == SWT.DEFAULT) wHint = 200;
	return super.computeSize (wHint, hHint, changed);
}

/**
 * Deselects the item at the given zero-relative index in the receiver.
 * If the item at the index was already deselected, it remains
 * deselected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to deselect
 *
 * @exception 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 deselect (int index) {
	checkWidget();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	OS.gtk_clist_unselect_row (handle, index, 0);
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Deselects the items at the given zero-relative indices in the receiver.
 * If the item at the given zero-relative index in the receiver 
 * is selected, it is deselected.  If the item at the index
 * was not selected, it remains deselected.  The range of the
 * indices is inclusive. Indices that are out of range are ignored.
 *
 * @param start the start index of the items to deselect
 * @param end the end index of the items to deselect
 *
 * @exception 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 deselect (int start, int end) {
	checkWidget();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	for (int i=start; i<=end; i++) {
		OS.gtk_clist_unselect_row (handle, i, 0);
	}
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Deselects the items at the given zero-relative indices in the receiver.
 * If the item at the given zero-relative index in the receiver 
 * is selected, it is deselected.  If the item at the index
 * was not selected, it remains deselected. Indices that are out
 * of range and duplicate indices are ignored.
 *
 * @param indices the array of indices for the items to deselect
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the 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>
 */
public void deselect (int [] indices) {
	checkWidget();
	if (indices == null) error (SWT.ERROR_NULL_ARGUMENT);
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	for (int i=0; i<indices.length; i++) {
		OS.gtk_clist_unselect_row (handle, indices [i], 0);
	}
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * 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();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	OS.gtk_clist_unselect_all (handle);
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Returns the zero-relative index of the item which is currently
 * has the focus in the receiver, or -1 if no item is has focus.
 *
 * @return the index of the selected 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 getFocusIndex () {
	checkWidget();
	GtkCList clist = new GtkCList();
	OS.memmove(clist, handle, GtkCList.sizeof);
	return clist.focus_row;
}

/**
 * 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 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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_ITEM - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public String getItem (int index) {
	checkWidget();
	int [] buffer = new int [1];
	int result = OS.gtk_clist_get_text (handle, index, 0, buffer);
	int length = OS.strlen (buffer [0]);
	byte [] buffer1 = new byte [length];
	OS.memmove (buffer1, buffer [0], length);
	char [] buffer2 = Converter.mbcsToWcs (null, buffer1);
	return new String (buffer2, 0, buffer2.length);
}

/**
 * Returns the number of items contained in the receiver.
 *
 * @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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_COUNT - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public int getItemCount () {
	checkWidget();
	GtkCList widget = new GtkCList ();
	OS.memmove (widget, handle, GtkCList.sizeof);
	return widget.rows;
}

/**
 * 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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_ITEM_HEIGHT - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public int getItemHeight () {
	checkWidget();
	GtkCList clist = new GtkCList ();
	OS.memmove (clist, handle, GtkCList.sizeof);
	return clist.row_height;
}

/**
 * Returns an array of <code>String</code>s which are the items
 * in the receiver. 
 * <p>
 * Note: This is not the actual structure used by the receiver
 * to maintain its list of items, so modifying the array will
 * not affect the receiver. 
 * </p>
 *
 * @return the items in the receiver's list
 *
 * @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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_ITEM - if the operation fails because of an operating system failure while getting an item</li>
 *    <li>ERROR_CANNOT_GET_COUNT - if the operation fails because of an operating system failure while getting the item count</li>
 * </ul>
 */
public String [] getItems () {
	checkWidget();
	int count = getItemCount ();
	String [] result = new String [count];
	for (int i=0; i<count; i++) result [i] = getItem (i);
	return result;
}

/**
 * Returns an array of <code>String</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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_SELECTION - if the operation fails because of an operating system failure while getting the selection</li>
 *    <li>ERROR_CANNOT_GET_ITEM - if the operation fails because of an operating system failure while getting an item</li>
 * </ul>
 */
public String [] getSelection () {
	checkWidget();
	GtkCList widget = new GtkCList ();
	OS.memmove (widget, handle, GtkCList.sizeof);
	int list = widget.selection;
	if (list==0) return new String[0];
	int length = OS.g_list_length (list);
	String [] items = new String [length];
	int [] buffer = new int [1];
	for (int i=0; i<length; i++) {
		int index = OS.g_list_nth_data (list, i);
		int result = OS.gtk_clist_get_text (handle, index, 0, buffer);
		int strlen = OS.strlen (buffer [0]);
		byte [] buffer1 = new byte [strlen];
		OS.memmove (buffer1, buffer [0], strlen);
		char [] buffer2 = Converter.mbcsToWcs (null, buffer1);
		items [i] = new String (buffer2, 0, buffer2.length);
	}
	return items;
}

/**
 * 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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_COUNT - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public int getSelectionCount () {
	checkWidget();
	GtkCList widget = new GtkCList ();
	OS.memmove (widget, handle, GtkCList.sizeof);
	return OS.g_list_length (widget.selection);
}

/**
 * Returns the zero-relative index of the item which is currently
 * selected in the receiver, or -1 if no item is selected.
 *
 * @return the index of the selected item
 *
 * @exception 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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_SELECTION - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public int getSelectionIndex () {
	checkWidget();
	GtkCList clist = new GtkCList ();
	OS.memmove(clist, handle, GtkCList.sizeof);
	int list = clist.selection;
	if (OS.g_list_length (list) == 0) return -1;
	return OS.g_list_nth_data (list, 0);
}

/**
 * Returns the zero-relative indices of the items which are currently
 * selected in the receiver.  The array is empty if no items are selected.
 * <p>
 * Note: This is not the actual structure used by the receiver
 * to maintain its selection, so modifying the array will
 * not affect the receiver. 
 * </p>
 * @return the array of indices of the selected items
 *
 * @exception 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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_SELECTION - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public int [] getSelectionIndices () {
	checkWidget();
	GtkCList widget = new GtkCList ();
	OS.memmove (widget, handle, GtkCList.sizeof);
	int list = widget.selection;
	int length = OS.g_list_length (list);
	int [] indices = new int [length];
	for (int i=0; i<length; i++) {
		indices [i] = OS.g_list_nth_data (list, i);
	}
	return indices;
}

/**
 * Returns the zero-relative index of the item which is currently
 * at the top of the receiver. This index can change when items are
 * scrolled or new items are added or removed.
 *
 * @return the index of the top item
 *
 * @exception 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 getTopIndex () {
	checkWidget();
	GtkCList clist = new GtkCList ();
	OS.memmove(clist, handle, GtkCList.sizeof);
	return -clist.voffset / (clist.row_height + 1);
}

/**
 * Gets the index of an item.
 * <p>
 * The list is searched starting at 0 until an
 * item is found that is equal to the search item.
 * If no item is found, -1 is returned.  Indexing
 * is zero based.
 *
 * @param string the search item
 * @return the index of the item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string 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 int indexOf (String string) {
	checkWidget();
	return indexOf (string, 0);
}

/**
 * Searches the receiver's list starting at the given, 
 * zero-relative index until an item is found that is equal
 * to the argument, and returns the index of that item. If
 * no item is found or the starting index is out of range,
 * returns -1.
 *
 * @param string the search item
 * @return the index of the item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string 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>
 * @exception SWTError <ul>
 *    <li>ERROR_CANNOT_GET_COUNT - if the operation fails because of an operating system failure while getting the item count</li>
 *    <li>ERROR_CANNOT_GET_ITEM - if the operation fails because of an operating system failure while getting an item</li>
 * </ul>
 */
public int indexOf (String string, int start) {
	checkWidget();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	String [] items = getItems ();
	for (int i=start; i<items.length; i++) {
		if (items [i].equals (string)) return i;
	}
	return -1;
}

/**
 * Returns <code>true</code> if the item is selected,
 * and <code>false</code> otherwise.  Indices out of
 * range are ignored.
 *
 * @param index the index of the item
 * @return the visibility state of the item at the index
 *
 * @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 boolean isSelected (int index) {
	checkWidget();
	GtkCList clist = new GtkCList ();
	OS.memmove (clist, handle, GtkCList.sizeof);
	int list = clist.selection;
	if (list == 0) return false;
	int length = OS.g_list_length (list);
	for (int i=0; i<length; i++) {
		if (index == OS.g_list_nth_data (list, i)) return true;
	}
	return false;
}

int processMouseDown (int callData, int arg1, int int2) {
	if ((style & SWT.MULTI) != 0) selected = true;
	return super.processMouseDown (callData, arg1, int2);
}

int processMouseUp (int callData, int arg1, int int2) {
	int result = super.processMouseUp (callData, arg1, int2);
	if ((style & SWT.MULTI) != 0) {
		/*
		* Feature in GTK.  When an item is reselected, GTK
		* does not issue notification.  The fix is to detect
		* that the mouse was released over a selected item when
		* no selection signal was set and issue a fake selection
		* event.
		*/
		GdkEventButton gdkEvent = new GdkEventButton ();
		OS.memmove (gdkEvent, callData, GdkEventButton.sizeof);
		int x = (int) gdkEvent.x, y = (int) gdkEvent.y;
		int [] row = new int [1], column = new int [1];
		int code = OS.gtk_clist_get_selection_info (handle, x, y, row, column);
		if (code != 0) {
			GtkCList clist = new GtkCList ();
			OS.memmove (clist, handle, GtkCList.sizeof);
			if (selected && clist.selection != 0) {
				int list = clist.selection;
				int length = OS.g_list_length (list);
				for (int i=0; i<length; i++) {
					if (row [0] == OS.g_list_nth_data (list, i)) {
						postEvent (SWT.Selection);
					}
				}
			}
		}
		selected = false;
	}
	return result;
}

int processSelection (int int0, int int1, int int2) {
	GtkCList clist = new GtkCList ();
	OS.memmove (clist, handle, GtkCList.sizeof);
	if (int0 != clist.focus_row) return 0;
	if ((style & SWT.MULTI) != 0) selected = false;
	boolean single = true;
	if (int2 != 0) {
		GdkEventButton gdkEvent = new GdkEventButton ();
		OS.memmove (gdkEvent, int2, GdkEventButton.sizeof);
		single = gdkEvent.type != OS.GDK_2BUTTON_PRESS;
	}
	if (single) {
		postEvent (SWT.Selection);
	} else {
		postEvent (SWT.DefaultSelection);
	}
	return 0;
}

/**
 * Removes the item from the receiver at the given
 * zero-relative index.
 *
 * @param index the index for the item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
 * </ul>
 * @exception 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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_REMOVED - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public void remove (int index) {
	checkWidget();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	OS.gtk_clist_remove (handle, index);
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Removes the items from the receiver which are
 * between the given zero-relative start and end 
 * indices (inclusive).
 *
 * @param start the start of the range
 * @param end the end of the range
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if either the start or end are not between 0 and the number of elements in the list minus 1 (inclusive)</li>
 * </ul>
 * @exception 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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_REMOVED - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public void remove (int start, int end) {
	checkWidget();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	int index = start;
	while (index <= end) {
		OS.gtk_clist_remove (handle, start);
		index++;
	}
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Searches the receiver's list starting at the first item
 * until an item is found that is equal to the argument, 
 * and removes that item from the list.
 *
 * @param string the item to remove
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the string is not found in the list</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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_REMOVED - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public void remove (String string) {
	checkWidget();
	int index = indexOf (string, 0);
	if (index == -1) error (SWT.ERROR_ITEM_NOT_REMOVED);
	remove (index);
}

/**
 * Removes the items from the receiver at the given
 * zero-relative indices.
 *
 * @param indices the array of indices of the items
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
 * </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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_REMOVED - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public void remove (int [] indices) {
	checkWidget();
	if (indices == null) error (SWT.ERROR_NULL_ARGUMENT);
	int [] newIndices = new int [indices.length];
	System.arraycopy (indices, 0, newIndices, 0, indices.length);
	sort (newIndices);
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	int last = -1;
	for (int i=0; i<newIndices.length; i++) {
		int index = newIndices [i];
		if (index != last || i == 0) {
			OS.gtk_clist_remove (handle, index);
			last = index;
		}
	}
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * 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();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	OS.gtk_clist_clear (handle);
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * 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);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection,listener);	
}

/**
 * Selects the item at the given zero-relative index in the receiver's 
 * list.  If the item at the index was already selected, it remains
 * selected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to select
 *
 * @exception 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 select (int index) {
	checkWidget();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	OS.gtk_clist_select_row (handle, index, 0);
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Selects the items at the given zero-relative indices in the receiver.
 * If the item at the index was already selected, it remains
 * selected. The range of the indices is inclusive. Indices that are
 * out of range are ignored.
 *
 * @param start the start of the range
 * @param end the end of the range
 *
 * @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 select (int start, int end) {
	checkWidget();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	for (int i=start; i<=end; i++) {
		OS.gtk_clist_select_row (handle, i, 0);
	}
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Selects the items at the given zero-relative indices in the receiver.
 * If the item at the given zero-relative index in the receiver 
 * is not selected, it is selected.  If the item at the index
 * was selected, it remains selected. Indices that are out
 * of range and duplicate indices are ignored.
 *
 * @param indices the array of indices for the items to select
 *
 * @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>
 */
public void select (int [] indices) {
	checkWidget();
	if (indices == null) error (SWT.ERROR_NULL_ARGUMENT);
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	for (int i=0; i<indices.length; i++) {
		OS.gtk_clist_select_row (handle, indices [i], 0);
	}
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Selects all the 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 selectAll () {
	checkWidget();
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	OS.gtk_clist_select_all (handle);
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Sets the text of the item in the receiver's list at the given
 * zero-relative index to the string argument. This is equivalent
 * to <code>remove</code>'ing the old item at the index, and then
 * <code>add</code>'ing the new item at that index.
 *
 * @param index the index for the item
 * @param string the new text for the item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
 * </ul>
 * @exception 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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_REMOVED - if the remove operation fails because of an operating system failure</li>
 *    <li>ERROR_ITEM_NOT_ADDED - if the add operation fails because of an operating system failure</li>
 * </ul>
 */
public void setItem (int index, String string) {
	checkWidget();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	byte [] buffer = Converter.wcsToMbcs (null, string, true);
	OS.gtk_signal_handler_block_by_data (handle, SWT.Selection);
	OS.gtk_clist_set_text (handle, index, 0, buffer);
	OS.gtk_signal_handler_unblock_by_data (handle, SWT.Selection);
}

/**
 * Sets the receiver's items to be the given array of items.
 *
 * @param items the array 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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_ADDED - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public void setItems (String [] items) {
	checkWidget();
	if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
	removeAll ();
	for (int i=0; i<items.length; i++) {
		add (items [i]);
	}
}

/**
 * Selects the item at the given zero-relative index in the receiver. 
 * If the item at the index was already selected, it remains selected.
 * The current selected is first cleared, then the new items are selected.
 * Indices that are out of range are ignored.
 *
 * @param index the index of the item to select
 *
 * @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 List#deselectAll()
 * @see List#select(int)
 */
public void setSelection (int index) {
	checkWidget();
	if ((style & SWT.MULTI) != 0) deselectAll ();
	select (index);
	showSelection ();
}

/**
 * Selects the items at the given zero-relative indices in the receiver. 
 * The current selected if first cleared, then the new items are selected.
 *
 * @param start the start index of the items to select
 * @param end the end index of the items to select
 *
 * @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 Table#deselectAll()
 * @see Table#select(int,int)
 */
public void setSelection (int start, int end) {
	checkWidget();
	if ((style & SWT.MULTI) != 0) deselectAll ();
	select (start, end);
	showSelection ();
}

/**
 * Selects the items at the given zero-relative indices in the receiver. 
 * The current selection is first cleared, then the new items are selected.
 *
 * @param indices the indices of the items to select
 *
 * @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 List#deselectAll()
 * @see List#select(int[])
 */
public void setSelection(int[] indices) {
	checkWidget();
	if ((style & SWT.MULTI) != 0) deselectAll ();
	select (indices);
	showSelection ();
}

/**
 * Sets the receiver's selection to be the given array of items.
 * The current selected is first cleared, then the new items are
 * selected.
 *
 * @param items the array of items
 *
 * @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 List#deselectAll()
 * @see List#select(int)
 */
public void setSelection (String [] items) {
	checkWidget();
	if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
	if ((style & SWT.MULTI) != 0) deselectAll ();
	for (int i=items.length-1; i>=0; --i) {
		int index = 0;
		String string = items [i];
		if (string != null) {
			while ((index = indexOf (string, index)) != -1) {
				select (index);
				if (((style & SWT.SINGLE) != 0) && isSelected (index)) {
					showSelection ();
					return;
				}
				index++;
			}
		}
	}
	if ((style & SWT.SINGLE) != 0) deselectAll ();
	showSelection ();
}

/**
 * Sets the zero-relative index of the item which is currently
 * at the top of the receiver. This index can change when items
 * are scrolled or new items are added and removed.
 *
 * @param index the index of the top item
 *
 * @exception 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 setTopIndex (int index) {
	checkWidget();
	//BUG IN GTK - doesn't scroll correctly before shell open
	OS.gtk_clist_moveto (handle, index, 0, 0.0f, 0.0f);
}

/**
 * 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 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>
 */
public void showSelection () {
	checkWidget();
	GtkCList clist = new GtkCList ();
	OS.memmove(clist, handle, GtkCList.sizeof);
	int list = clist.selection;
	if (OS.g_list_length (list) == 0) return;
	int index = OS.g_list_nth_data (list, 0);
	int visibility = OS.gtk_clist_row_is_visible (handle, index);
	if (visibility == OS.GTK_VISIBILITY_FULL) return;
	//BUG IN GTK - doesn't scroll correctly before shell open
	OS.gtk_clist_moveto (handle, index, 0, 0.5f, 0.0f);
}

}