bundles/org.eclipse.swt/Eclipse SWT/carbon/org/eclipse/swt/widgets/TabFolder.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2003 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.internal.carbon.OS;
 import org.eclipse.swt.internal.carbon.Rect;

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

 /**
  * Instances of this class implement the notebook user interface
  * metaphor.  It allows the user to select a notebook page from
  * set of pages.
  * <p>
  * The item children that may be added to instances of this class
  * must be of type <code>TabItem</code>.
  * <code>Control</code> children are created and then set into a
  * tab item using <code>TabItem#setControl</code>.
  * </p><p>
  * Note that although this class is a subclass of <code>Composite</code>,
  * it does not make sense to set a layout on it.
  * </p><p>
  * <dl>
  * <dt><b>Styles:</b></dt>
  * <dd>TOP, BOTTOM</dd>
  * <dt><b>Events:</b></dt>
  * <dd>Selection</dd>
  * </dl>
  * <p>
  * Note: Only one of the styles TOP and BOTTOM may be specified.
  * </p><p>
  * IMPORTANT: This class is <em>not</em> intended to be subclassed.
  * </p>
  */
 public class TabFolder extends Composite {
 	TabItem [] items;
 	int lastSelected = -1;

 /**
  * 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
  * @see Widget#checkSubclass
  * @see Widget#getStyle
  */
 public TabFolder (Composite parent, int style) {
 	super (parent, checkStyle (style));
 }

 /**
  * 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.
  * <code>widgetDefaultSelected</code> is not called.
  * </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) {
 	style = checkBits (style, SWT.TOP, SWT.BOTTOM, 0, 0, 0, 0);
 	/*
 	* Even though it is legal to create this widget
 	* with scroll bars, they serve no useful purpose
 	* because they do not automatically scroll the
 	* widget's client area.  The fix is to clear
 	* the SWT style.
 	*/
 	return style & ~(SWT.H_SCROLL | SWT.V_SCROLL);
 }

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

 public Point computeSize (int wHint, int hHint, boolean changed) {
 	checkWidget ();
 	int width = 0, height = 0;
 	if (wHint == SWT.DEFAULT) {
 		GC gc = new GC (this);
 		for (int i = 0; i < items.length; i++) {
 			if (items [i] != null) {
 				width += items [i].calculateWidth (gc);
 			}
 		}
 		gc.dispose ();
 	}
 	Point size;
 	if (layout != null) {
 		size = layout.computeSize (this, wHint, hHint, changed);
 	} else {
 		size = minimumSize (wHint, hHint, changed);
 	}
 	if (size.x == 0) size.x = DEFAULT_WIDTH;
 	if (size.y == 0) size.y = DEFAULT_HEIGHT;
 	if (wHint != SWT.DEFAULT) size.x = wHint;
 	if (hHint != SWT.DEFAULT) size.y = hHint;
 	width = Math.max (width, size.x);
 	height = Math.max (height, size.y);
 	Rectangle trim = computeTrim (0, 0, width, height);
 	width = trim.width;  height = trim.height;
 	return new Point (width, height);
 }

 public Rectangle computeTrim (int x, int y, int width, int height) {
 	checkWidget ();
 	Rect bounds, oldBounds = new Rect ();
 	OS.GetControlBounds (handle, oldBounds);
 	boolean fixBounds = (oldBounds.right - oldBounds.left) < 100 || (oldBounds.bottom - oldBounds.top) < 100;
 	if (fixBounds) {
 		bounds = new Rect ();
 		bounds.right = bounds.bottom = 100;
 		OS.SetControlBounds (handle, bounds);
 	} else {
 		bounds = oldBounds;
 	}
 	Rect client = new Rect ();
 	OS.GetTabContentRect (handle, client);
 	if (fixBounds) OS.SetControlBounds (handle, oldBounds);
 	x -= client.left - bounds.left;
 	y -= client.top - bounds.top;
 	width += (bounds.right - bounds.left) - (client.right - client.left);
 	height += (bounds.bottom - bounds.top) - (client.bottom - client.top);
 	Rect inset = getInset ();
 	x -= inset.left;
 	y -= inset.top;
 	width += inset.left + inset.right;
 	height += inset.top + inset.bottom;
 	return new Rectangle (x, y, width, height);
 }

 void createHandle () {
 	int [] outControl = new int [1];
 	int window = OS.GetControlOwner (parent.handle);
 	short direction = (style & SWT.BOTTOM) != 0 ? (short)OS.kControlTabDirectionSouth : (short)OS.kControlTabDirectionNorth;
 	OS.CreateTabsControl (window, new Rect (), (short)OS.kControlTabSizeLarge, direction, (short) 0, 0, outControl);
 	if (outControl [0] == 0) error (SWT.ERROR_NO_HANDLES);
 	handle = outControl [0];
 }

 void createItem (TabItem item, int index) {
 	int count = OS.GetControl32BitMaximum (handle);
 	if (!(0 <= index && index <= count)) error (SWT.ERROR_INVALID_RANGE);
 	OS.SetControl32BitMaximum (handle, count+1);
 	if (count == items.length) {
 		TabItem [] newItems = new TabItem [items.length + 4];
 		System.arraycopy (items, 0, newItems, 0, items.length);
 		items = newItems;
 	}
 	System.arraycopy (items, index, items, index + 1, count - index);
 	items [index] = item;

 	/*
 	* Send a selection event when the item that is added becomes
 	* the new selection.  This only happens when the first item
 	* is added.
 	*/
 	if (count == 0) {
 		OS.SetControl32BitValue (handle, 1);
 		lastSelected = 0;
 		Event event = new Event ();
 		event.item = items [0];
 		sendEvent (SWT.Selection, event);
 		// the widget could be destroyed at this point
 	}
 }

 void createWidget () {
 	super.createWidget ();
 	items = new TabItem [4];
 }

 void destroyItem (TabItem item) {
 	int count = OS.GetControl32BitMaximum (handle);
 	int index = 0;
 	while (index < count) {
 		if (items [index] == item) break;
 		index++;
 	}
 	if (index == count) return;
 	int selectionIndex = OS.GetControl32BitValue (handle) - 1;
 	--count;
 	OS.SetControl32BitMaximum (handle, count);
 	System.arraycopy (items, index + 1, items, index, count - index);
 	items [count] = null;
 	if (count == 0) {
 		items = new TabItem [4];
 	}
 	if (count > 0 && index == selectionIndex) {
 		setSelection (Math.max (0, selectionIndex - 1), true);
 	}
 }

 public Rectangle getClientArea () {
 	checkWidget ();
 	Rect bounds = new Rect ();
 	OS.GetControlBounds (handle, bounds);
 	Rect client = new Rect ();
 	OS.GetControlData (handle, (short)OS.kControlEntireControl, OS.kControlTabContentRectTag, Rect.sizeof, client, null);
 	int x = Math.max (0, client.left - bounds.left);
 	int y = Math.max (0, client.top - bounds.top);
 	int width = Math.max (0, client.right - client.left);
 	int height = Math.max (0, client.bottom - client.top);
 	return new Rectangle (x, y, width, 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 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 TabItem getItem (int index) {
 	checkWidget ();
 	int count = OS.GetControl32BitMaximum (handle);
 	if (!(0 <= index && index < count)) error (SWT.ERROR_INVALID_RANGE);
 	return items [index];
 }

 /**
  * 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>
  */
 public int getItemCount () {
 	checkWidget ();
 	return OS.GetControl32BitMaximum (handle);
 }

 /**
  * Returns an array of <code>TabItem</code>s which are the items
  * in the receiver.
  * <p>
  * Note: This is not the actual structure used by the receiver
  * to maintain its list of items, so modifying the array will
  * not affect the receiver.
  * </p>
  *
  * @return the items in the receiver
  *
  * @exception 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 TabItem [] getItems () {
 	checkWidget ();
 	int count = OS.GetControl32BitMaximum (handle);
 	TabItem [] result = new TabItem [count];
 	System.arraycopy (items, 0, result, 0, count);
 	return result;
 }

 /**
  * Returns an array of <code>TabItem</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 TabItem [] getSelection () {
 	checkWidget ();
 	int index = OS.GetControl32BitValue(handle) - 1;
 	if (index == -1) return new TabItem [0];
 	return new TabItem [] {items [index]};
 }

 /**
  * 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>
  */
 public int getSelectionIndex () {
 	checkWidget ();
 	return OS.GetControl32BitValue (handle) - 1;
 }

 /**
  * Searches the receiver's list starting at the first item
  * (index 0) until an item is found that is equal to the
  * argument, and returns the index of that item. If no item
  * is found, returns -1.
  *
  * @param item the search item
  * @return the index of the item
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the 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 (TabItem item) {
 	checkWidget ();
 	if (item == null) error (SWT.ERROR_NULL_ARGUMENT);
 	int count = OS.GetControl32BitMaximum (handle);
 	for (int i=0; i<count; i++) {
 		if (items [i] == item) return i;
 	}
 	return -1;
 }

 Point minimumSize (int wHint, int hHint, boolean flushCache) {
 	Control [] children = _getChildren ();
 	int width = 0, height = 0;
 	for (int i=0; i<children.length; i++) {
 		Control child = children [i];
 		int index = 0;
 		int count = OS.GetControl32BitMaximum (handle);
 		while (index < count) {
 			if (items [index].control == child) break;
 			index++;
 		}
 		if (index == count) {
 			Rectangle rect = child.getBounds ();
 			width = Math.max (width, rect.x + rect.width);
 			height = Math.max (height, rect.y + rect.height);
 		} else {
 			Point size = child.computeSize (wHint, hHint, flushCache);
 			width = Math.max (width, size.x);
 			height = Math.max (height, size.y);
 		}
 	}
 	return new Point (width, height);
 }

 Rect getInset () {
 	return (style & SWT.BOTTOM) != 0 ? display.tabFolderSouthInset : display.tabFolderNorthInset;
 }

 int kEventControlApplyBackground (int nextHandler, int theEvent, int userData) {
 	/*
 	* Feature in the Macintosh.  For some reason, the tab folder applies the
 	* theme background when drawing even though a theme has not been set for
 	* the window.  The fix is to avoid running the default handler.
 	*/
 	return OS.noErr;
 }

 int kEventControlHit (int nextHandler, int theEvent, int userData) {
 	int result = super.kEventControlHit (nextHandler, theEvent, userData);
 	if (result == OS.noErr) return result;
 	int index = OS.GetControl32BitValue (handle) - 1;
 	if (index == lastSelected) return result;
 	lastSelected = index;
 	int count = OS.GetControl32BitMaximum (handle);
 	for (int i = 0; i < count; i++) {
 		if (i != index) {
 			Control control = items [i].control;
 			if (control != null && !control.isDisposed ())
 				control.setVisible (false);
 		}
 	}
 	TabItem item = null;
 	if (index != -1) item = items [index];
 	if (item != null) {
 		Control control = item.control;
 		if (control != null && !control.isDisposed ()) {
 			control.setBounds (getClientArea ());
 			control.setVisible (true);
 		}
 	}
 	Event event = new Event ();
 	event.item = item;
 	postEvent (SWT.Selection, event);
 	return OS.noErr;
 }

 void releaseWidget () {
 	int count = OS.GetControl32BitMaximum (handle);
 	for (int i=0; i<count; i++) {
 		TabItem item = items [i];
 		if (!item.isDisposed ()) item.releaseResources ();
 	}
 	items = null;
 	super.releaseWidget ();
 }

 /**
  * 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);
 }

 int setBounds (int c, int x, int y, int width, int height, boolean move, boolean resize, boolean events) {
 	int result = super.setBounds(c, x, y, width, height, move, resize, events);
 	if ((result & RESIZED) != 0) {
 		int index = OS.GetControl32BitValue (handle) - 1;
 		if (index != -1) {
 			TabItem item = items [index];
 			Control control = item.control;
 			if (control != null && !control.isDisposed ()) {
 				control.setBounds (getClientArea ());
 			}
 		}
 	}
 	return result;
 }

 /**
  * 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 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 setSelection (TabItem [] items) {
 	checkWidget ();
 	if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
 	if (items.length == 0) {
 		setSelection (-1, false);
 	} else {
 		for (int i=items.length - 1; i>=0; --i) {
 			int index = indexOf (items [i]);
 			if (index != -1) setSelection (index, false);
 		}
 	}
 }

 /**
  * 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>
  */
 public void setSelection (int index) {
 	checkWidget ();
 	int count = OS.GetControl32BitMaximum (handle);
 	if (!(0 <= index && index < count)) return;
 	setSelection (index, false);
 }

 void setSelection (int index, boolean notify) {
 	if (index >= OS.GetControl32BitMaximum (handle)) return;
 	int currentIndex = OS.GetControl32BitValue (handle) - 1;
 	if (currentIndex != -1) {
 		TabItem item = items [currentIndex];
 		if (item != null) {
 			Control control = item.control;
 			if (control != null && !control.isDisposed ()) {
 				control.setVisible (false);
 			}
 		}
 	}
 	OS.SetControl32BitValue (handle, index+1);
 	index = OS.GetControl32BitValue (handle) - 1;
 	lastSelected = index;
 	if (index != -1) {
 		TabItem item = items [index];
 		if (item != null) {
 			Control control = item.control;
 			if (control != null && !control.isDisposed ()) {
 				control.setBounds (getClientArea ());
 				control.setVisible (true);
 			}
 			if (notify) {
 				Event event = new Event ();
 				event.item = item;
 				sendEvent (SWT.Selection, event);
 			}
 		}
 	}
 }

 boolean traversePage (boolean next) {
 	int count = getItemCount ();
 	if (count == 0) return false;
 	int index = getSelectionIndex ();
 	if (index == -1) {
 		index = 0;
 	} else {
 		int offset = (next) ? 1 : -1;
 		index = (index + offset + count) % count;
 	}
 	setSelection (index, true);
 	return index == getSelectionIndex ();
 }
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2003 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.internal.carbon.OS;
	import org.eclipse.swt.internal.carbon.Rect;

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

	/**
	* Instances of this class implement the notebook user interface
	* metaphor. It allows the user to select a notebook page from
	* set of pages.
	* <p>
	* The item children that may be added to instances of this class
	* must be of type <code>TabItem</code>.
	* <code>Control</code> children are created and then set into a
	* tab item using <code>TabItem#setControl</code>.
	* </p><p>
	* Note that although this class is a subclass of <code>Composite</code>,
	* it does not make sense to set a layout on it.
	* </p><p>
	* <dl>
	* <dt><b>Styles:</b></dt>
	* <dd>TOP, BOTTOM</dd>
	* <dt><b>Events:</b></dt>
	* <dd>Selection</dd>
	* </dl>
	* <p>
	* Note: Only one of the styles TOP and BOTTOM may be specified.
	* </p><p>
	* IMPORTANT: This class is <em>not</em> intended to be subclassed.
	* </p>
	*/
	public class TabFolder extends Composite {
	TabItem [] items;
	int lastSelected = -1;

	/**
	* 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
	* @see Widget#checkSubclass
	* @see Widget#getStyle
	*/
	public TabFolder (Composite parent, int style) {
	super (parent, checkStyle (style));
	}

	/**
	* 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.
	* <code>widgetDefaultSelected</code> is not called.
	* </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) {
	style = checkBits (style, SWT.TOP, SWT.BOTTOM, 0, 0, 0, 0);
	/*
	* Even though it is legal to create this widget
	* with scroll bars, they serve no useful purpose
	* because they do not automatically scroll the
	* widget's client area. The fix is to clear
	* the SWT style.
	*/
	return style & ~(SWT.H_SCROLL \| SWT.V_SCROLL);
	}

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

	public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	int width = 0, height = 0;
	if (wHint == SWT.DEFAULT) {
	GC gc = new GC (this);
	for (int i = 0; i < items.length; i++) {
	if (items [i] != null) {
	width += items [i].calculateWidth (gc);
	}
	}
	gc.dispose ();
	}
	Point size;
	if (layout != null) {
	size = layout.computeSize (this, wHint, hHint, changed);
	} else {
	size = minimumSize (wHint, hHint, changed);
	}
	if (size.x == 0) size.x = DEFAULT_WIDTH;
	if (size.y == 0) size.y = DEFAULT_HEIGHT;
	if (wHint != SWT.DEFAULT) size.x = wHint;
	if (hHint != SWT.DEFAULT) size.y = hHint;
	width = Math.max (width, size.x);
	height = Math.max (height, size.y);
	Rectangle trim = computeTrim (0, 0, width, height);
	width = trim.width; height = trim.height;
	return new Point (width, height);
	}

	public Rectangle computeTrim (int x, int y, int width, int height) {
	checkWidget ();
	Rect bounds, oldBounds = new Rect ();
	OS.GetControlBounds (handle, oldBounds);
	boolean fixBounds = (oldBounds.right - oldBounds.left) < 100 \|\| (oldBounds.bottom - oldBounds.top) < 100;
	if (fixBounds) {
	bounds = new Rect ();
	bounds.right = bounds.bottom = 100;
	OS.SetControlBounds (handle, bounds);
	} else {
	bounds = oldBounds;
	}
	Rect client = new Rect ();
	OS.GetTabContentRect (handle, client);
	if (fixBounds) OS.SetControlBounds (handle, oldBounds);
	x -= client.left - bounds.left;
	y -= client.top - bounds.top;
	width += (bounds.right - bounds.left) - (client.right - client.left);
	height += (bounds.bottom - bounds.top) - (client.bottom - client.top);
	Rect inset = getInset ();
	x -= inset.left;
	y -= inset.top;
	width += inset.left + inset.right;
	height += inset.top + inset.bottom;
	return new Rectangle (x, y, width, height);
	}

	void createHandle () {
	int [] outControl = new int [1];
	int window = OS.GetControlOwner (parent.handle);
	short direction = (style & SWT.BOTTOM) != 0 ? (short)OS.kControlTabDirectionSouth : (short)OS.kControlTabDirectionNorth;
	OS.CreateTabsControl (window, new Rect (), (short)OS.kControlTabSizeLarge, direction, (short) 0, 0, outControl);
	if (outControl [0] == 0) error (SWT.ERROR_NO_HANDLES);
	handle = outControl [0];
	}

	void createItem (TabItem item, int index) {
	int count = OS.GetControl32BitMaximum (handle);
	if (!(0 <= index && index <= count)) error (SWT.ERROR_INVALID_RANGE);
	OS.SetControl32BitMaximum (handle, count+1);
	if (count == items.length) {
	TabItem [] newItems = new TabItem [items.length + 4];
	System.arraycopy (items, 0, newItems, 0, items.length);
	items = newItems;
	}
	System.arraycopy (items, index, items, index + 1, count - index);
	items [index] = item;

	/*
	* Send a selection event when the item that is added becomes
	* the new selection. This only happens when the first item
	* is added.
	*/
	if (count == 0) {
	OS.SetControl32BitValue (handle, 1);
	lastSelected = 0;
	Event event = new Event ();
	event.item = items [0];
	sendEvent (SWT.Selection, event);
	// the widget could be destroyed at this point
	}
	}

	void createWidget () {
	super.createWidget ();
	items = new TabItem [4];
	}

	void destroyItem (TabItem item) {
	int count = OS.GetControl32BitMaximum (handle);
	int index = 0;
	while (index < count) {
	if (items [index] == item) break;
	index++;
	}
	if (index == count) return;
	int selectionIndex = OS.GetControl32BitValue (handle) - 1;
	--count;
	OS.SetControl32BitMaximum (handle, count);
	System.arraycopy (items, index + 1, items, index, count - index);
	items [count] = null;
	if (count == 0) {
	items = new TabItem [4];
	}
	if (count > 0 && index == selectionIndex) {
	setSelection (Math.max (0, selectionIndex - 1), true);
	}
	}

	public Rectangle getClientArea () {
	checkWidget ();
	Rect bounds = new Rect ();
	OS.GetControlBounds (handle, bounds);
	Rect client = new Rect ();
	OS.GetControlData (handle, (short)OS.kControlEntireControl, OS.kControlTabContentRectTag, Rect.sizeof, client, null);
	int x = Math.max (0, client.left - bounds.left);
	int y = Math.max (0, client.top - bounds.top);
	int width = Math.max (0, client.right - client.left);
	int height = Math.max (0, client.bottom - client.top);
	return new Rectangle (x, y, width, 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 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 TabItem getItem (int index) {
	checkWidget ();
	int count = OS.GetControl32BitMaximum (handle);
	if (!(0 <= index && index < count)) error (SWT.ERROR_INVALID_RANGE);
	return items [index];
	}

	/**
	* 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>
	*/
	public int getItemCount () {
	checkWidget ();
	return OS.GetControl32BitMaximum (handle);
	}

	/**
	* Returns an array of <code>TabItem</code>s which are the items
	* in the receiver.
	* <p>
	* Note: This is not the actual structure used by the receiver
	* to maintain its list of items, so modifying the array will
	* not affect the receiver.
	* </p>
	*
	* @return the items in the receiver
	*
	* @exception 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 TabItem [] getItems () {
	checkWidget ();
	int count = OS.GetControl32BitMaximum (handle);
	TabItem [] result = new TabItem [count];
	System.arraycopy (items, 0, result, 0, count);
	return result;
	}

	/**
	* Returns an array of <code>TabItem</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 TabItem [] getSelection () {
	checkWidget ();
	int index = OS.GetControl32BitValue(handle) - 1;
	if (index == -1) return new TabItem [0];
	return new TabItem [] {items [index]};
	}

	/**
	* 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>
	*/
	public int getSelectionIndex () {
	checkWidget ();
	return OS.GetControl32BitValue (handle) - 1;
	}

	/**
	* Searches the receiver's list starting at the first item
	* (index 0) until an item is found that is equal to the
	* argument, and returns the index of that item. If no item
	* is found, returns -1.
	*
	* @param item the search item
	* @return the index of the item
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the 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 (TabItem item) {
	checkWidget ();
	if (item == null) error (SWT.ERROR_NULL_ARGUMENT);
	int count = OS.GetControl32BitMaximum (handle);
	for (int i=0; i<count; i++) {
	if (items [i] == item) return i;
	}
	return -1;
	}

	Point minimumSize (int wHint, int hHint, boolean flushCache) {
	Control [] children = _getChildren ();
	int width = 0, height = 0;
	for (int i=0; i<children.length; i++) {
	Control child = children [i];
	int index = 0;
	int count = OS.GetControl32BitMaximum (handle);
	while (index < count) {
	if (items [index].control == child) break;
	index++;
	}
	if (index == count) {
	Rectangle rect = child.getBounds ();
	width = Math.max (width, rect.x + rect.width);
	height = Math.max (height, rect.y + rect.height);
	} else {
	Point size = child.computeSize (wHint, hHint, flushCache);
	width = Math.max (width, size.x);
	height = Math.max (height, size.y);
	}
	}
	return new Point (width, height);
	}

	Rect getInset () {
	return (style & SWT.BOTTOM) != 0 ? display.tabFolderSouthInset : display.tabFolderNorthInset;
	}

	int kEventControlApplyBackground (int nextHandler, int theEvent, int userData) {
	/*
	* Feature in the Macintosh. For some reason, the tab folder applies the
	* theme background when drawing even though a theme has not been set for
	* the window. The fix is to avoid running the default handler.
	*/
	return OS.noErr;
	}

	int kEventControlHit (int nextHandler, int theEvent, int userData) {
	int result = super.kEventControlHit (nextHandler, theEvent, userData);
	if (result == OS.noErr) return result;
	int index = OS.GetControl32BitValue (handle) - 1;
	if (index == lastSelected) return result;
	lastSelected = index;
	int count = OS.GetControl32BitMaximum (handle);
	for (int i = 0; i < count; i++) {
	if (i != index) {
	Control control = items [i].control;
	if (control != null && !control.isDisposed ())
	control.setVisible (false);
	}
	}
	TabItem item = null;
	if (index != -1) item = items [index];
	if (item != null) {
	Control control = item.control;
	if (control != null && !control.isDisposed ()) {
	control.setBounds (getClientArea ());
	control.setVisible (true);
	}
	}
	Event event = new Event ();
	event.item = item;
	postEvent (SWT.Selection, event);
	return OS.noErr;
	}

	void releaseWidget () {
	int count = OS.GetControl32BitMaximum (handle);
	for (int i=0; i<count; i++) {
	TabItem item = items [i];
	if (!item.isDisposed ()) item.releaseResources ();
	}
	items = null;
	super.releaseWidget ();
	}

	/**
	* 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);
	}

	int setBounds (int c, int x, int y, int width, int height, boolean move, boolean resize, boolean events) {
	int result = super.setBounds(c, x, y, width, height, move, resize, events);
	if ((result & RESIZED) != 0) {
	int index = OS.GetControl32BitValue (handle) - 1;
	if (index != -1) {
	TabItem item = items [index];
	Control control = item.control;
	if (control != null && !control.isDisposed ()) {
	control.setBounds (getClientArea ());
	}
	}
	}
	return result;
	}

	/**
	* 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 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 setSelection (TabItem [] items) {
	checkWidget ();
	if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (items.length == 0) {
	setSelection (-1, false);
	} else {
	for (int i=items.length - 1; i>=0; --i) {
	int index = indexOf (items [i]);
	if (index != -1) setSelection (index, false);
	}
	}
	}

	/**
	* 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>
	*/
	public void setSelection (int index) {
	checkWidget ();
	int count = OS.GetControl32BitMaximum (handle);
	if (!(0 <= index && index < count)) return;
	setSelection (index, false);
	}

	void setSelection (int index, boolean notify) {
	if (index >= OS.GetControl32BitMaximum (handle)) return;
	int currentIndex = OS.GetControl32BitValue (handle) - 1;
	if (currentIndex != -1) {
	TabItem item = items [currentIndex];
	if (item != null) {
	Control control = item.control;
	if (control != null && !control.isDisposed ()) {
	control.setVisible (false);
	}
	}
	}
	OS.SetControl32BitValue (handle, index+1);
	index = OS.GetControl32BitValue (handle) - 1;
	lastSelected = index;
	if (index != -1) {
	TabItem item = items [index];
	if (item != null) {
	Control control = item.control;
	if (control != null && !control.isDisposed ()) {
	control.setBounds (getClientArea ());
	control.setVisible (true);
	}
	if (notify) {
	Event event = new Event ();
	event.item = item;
	sendEvent (SWT.Selection, event);
	}
	}
	}
	}

	boolean traversePage (boolean next) {
	int count = getItemCount ();
	if (count == 0) return false;
	int index = getSelectionIndex ();
	if (index == -1) {
	index = 0;
	} else {
	int offset = (next) ? 1 : -1;
	index = (index + offset + count) % count;
	}
	setSelection (index, true);
	return index == getSelectionIndex ();
	}
	}