bundles/org.eclipse.swt/Eclipse SWT/wpf/org/eclipse/swt/widgets/TabItem.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2008 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.swt.widgets;


 import org.eclipse.swt.internal.wpf.*;
 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;

 /**
  * Instances of this class represent a selectable user interface object
  * corresponding to a tab for a page in a tab folder.
  * <dl>
  * <dt><b>Styles:</b></dt>
  * <dd>(none)</dd>
  * <dt><b>Events:</b></dt>
  * <dd>(none)</dd>
  * </dl>
  * <p>
  * IMPORTANT: This class is <em>not</em> intended to be subclassed.
  * </p>
  *
  * @see <a href="http://www.eclipse.org/swt/snippets/#tabfolder">TabFolder, TabItem snippets</a>
  * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
  * @noextend This class is not intended to be subclassed by clients.
  */

 public class TabItem extends Item {
 	TabFolder parent;
 	Control control;
 	String toolTipText;
 	int imageHandle, textHandle, contentHandle;


 /**
  * Constructs a new instance of this class given its parent
  * (which must be a <code>TabFolder</code>) and a style value
  * describing its behavior and appearance. The item is added
  * to the end of the items maintained by its parent.
  * <p>
  * The style value is either one of the style constants defined in
  * class <code>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 TabItem (TabFolder parent, int style) {
 	super (parent, style);
 	this.parent = parent;
 	parent.createItem (this, parent.getItemCount ());
 }

 /**
  * Constructs a new instance of this class given its parent
  * (which must be a <code>TabFolder</code>), a style value
  * describing its behavior and appearance, and the index
  * at which to place it in the items maintained by its parent.
  * <p>
  * The style value is either one of the style constants defined in
  * class <code>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
  * @param index the zero-relative index to store the receiver in its parent
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
  *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</li>
  * </ul>
  * @exception 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 TabItem (TabFolder parent, int style, int index) {
 	super (parent, style);
 	this.parent = parent;
 	parent.createItem (this, index);
 }

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

 void createHandle () {
 	handle = OS.gcnew_TabItem ();
 	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
 	imageHandle = OS.gcnew_Image ();
 	if (imageHandle == 0) error (SWT.ERROR_NO_HANDLES);
 	OS.Image_Stretch (imageHandle, OS.Stretch_None);
 	int thickness = OS.gcnew_Thickness (0, 0, 3, 0);
 	if (thickness == 0) error (SWT.ERROR_NO_HANDLES);
 	OS.FrameworkElement_Margin (imageHandle, thickness);
 	OS.GCHandle_Free (thickness);
 	OS.UIElement_Visibility (imageHandle, OS.Visibility_Collapsed);
 	textHandle = OS.gcnew_AccessText ();
 	if (textHandle == 0) error (SWT.ERROR_NO_HANDLES);
 	OS.FrameworkElement_VerticalAlignment (textHandle, OS.VerticalAlignment_Center);
 	int panel = OS.gcnew_StackPanel ();
 	if (panel == 0) error (SWT.ERROR_NO_HANDLES);
 	OS.StackPanel_Orientation (panel, OS.Orientation_Horizontal);
 	thickness = OS.gcnew_Thickness (1, 1, 1, 1);
 	if (thickness == 0) error (SWT.ERROR_NO_HANDLES);
 	OS.FrameworkElement_Margin (panel, thickness);
 	OS.GCHandle_Free(thickness);
 	int children = OS.Panel_Children (panel);
 	OS.UIElementCollection_Add (children, imageHandle);
 	OS.UIElementCollection_Add (children, textHandle);
 	OS.HeaderedContentControl_Header (handle, panel);
 	OS.GCHandle_Free (children);
 	OS.GCHandle_Free (panel);
 	contentHandle = OS.gcnew_Canvas ();
 	if (contentHandle == 0) error (SWT.ERROR_NO_HANDLES);
 	OS.ContentControl_Content (handle, contentHandle);
 }

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

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

 /**
  * Returns a rectangle describing the receiver's size and location
  * relative to its parent.
  *
  * @return the receiver's bounding rectangle
  *
  * @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 3.4
  */
 public Rectangle getBounds () {
 	checkWidget ();
 	int topHandle =	handle;
 	int point = OS.gcnew_Point (0, 0);
 	if (point == 0) error (SWT.ERROR_NO_HANDLES);
 	int location = OS.UIElement_TranslatePoint (topHandle, point, parent.handle);
 	int x = (int) OS.Point_X (location);
 	int y = (int) OS.Point_Y (location);
 	OS.GCHandle_Free (point);
 	OS.GCHandle_Free (location);
 	int width = (int) OS.FrameworkElement_ActualWidth (topHandle);
 	int height = (int) OS.FrameworkElement_ActualHeight (topHandle);
 	return new Rectangle (x, y, width, height);
 }

 /**
  * Returns the control that is used to fill the client area of
  * the tab folder when the user selects the tab item.  If no
  * control has been set, return <code>null</code>.
  * <p>
  * @return the control
  *
  * @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 Control getControl () {
 	checkWidget();
 	return control;
 }

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

 Control getWidgetControl () {
 	return parent;
 }

 /**
  * Returns the receiver's tool tip text, or null if it has
  * not been set.
  *
  * @return the receiver's tool tip text
  *
  * @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 String getToolTipText () {
 	checkWidget();
 	return toolTipText;
 }

 void HandleSizeChanged (int sender, int e) {
 	if (!checkEvent (e)) return;
 	if (control == null) return;
 	control.setBounds (parent.getClientArea ());
 }

 void hookEvents () {
 	super.hookEvents ();
 	int handler = OS.gcnew_SizeChangedEventHandler (jniRef, "HandleSizeChanged");
 	OS.FrameworkElement_SizeChanged (contentHandle, handler);
 	OS.GCHandle_Free (handler);
 }

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

 void releaseHandle () {
 	super.releaseHandle ();
 	if (handle != 0) OS.GCHandle_Free (handle);
 	handle = 0;
 	parent = null;
 	if (textHandle != 0) OS.GCHandle_Free (textHandle);
 	textHandle = 0;
 	if (imageHandle !=0 )OS.GCHandle_Free (imageHandle);
 	imageHandle = 0;
 	if (contentHandle != 0) OS.GCHandle_Free (contentHandle);
 	contentHandle = 0;
 }

 void releaseParent () {
 	super.releaseParent ();
 	int index = parent.indexOf (this);
 	if (index == parent.getSelectionIndex ()) {
 		if (control != null) control.setVisible (false);
 	}
 }

 void releaseWidget () {
 	super.releaseWidget ();
 	control = null;
 	toolTipText = null;
 }

 /**
  * Sets the control that is used to fill the client area of
  * the tab folder when the user selects the tab item.
  * <p>
  * @param control the new control (or null)
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li>
  *    <li>ERROR_INVALID_PARENT - if the control is not in the same widget tree</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 setControl (Control control) {
 	checkWidget();
 	if (control != null) {
 		if (control.isDisposed()) error (SWT.ERROR_INVALID_ARGUMENT);
 		if (control.parent != parent) error (SWT.ERROR_INVALID_PARENT);
 	}
 	if (this.control != null && this.control.isDisposed ()) {
 		this.control = null;
 	}
 	Control oldControl = this.control, newControl = control;
 	this.control = control;
 	int index = parent.indexOf (this), selectionIndex = parent.getSelectionIndex();
 	if (index != selectionIndex) {
 		if (newControl != null) {
 			if (selectionIndex != -1) {
 				Control selectedControl = parent.getItem(selectionIndex).getControl();
 				if (selectedControl == newControl) return;
 			}
 			newControl.setVisible(false);
 			return;
 		}
 	}
 	if (newControl != null) {
 		newControl.setBounds (parent.getClientArea ());
 		newControl.setVisible (true);
 	}
 	if (oldControl != null) oldControl.setVisible (false);
 }

 public void setImage (Image image) {
 	checkWidget();
 	super.setImage (image);
 	OS.Image_Source (imageHandle, image != null ? image.handle : 0);
 	OS.UIElement_Visibility (imageHandle, image != null ? OS.Visibility_Visible : OS.Visibility_Collapsed);
 }

 /**
  * Sets the receiver's text.  The string may include
  * the mnemonic character.
  * </p>
  * <p>
  * Mnemonics are indicated by an '&amp;' that causes the next
  * character to be the mnemonic.  When the user presses a
  * key sequence that matches the mnemonic, a selection
  * event occurs. On most platforms, the mnemonic appears
  * underlined but may be emphasised in a platform specific
  * manner.  The mnemonic indicator character '&amp;' can be
  * escaped by doubling it in the string, causing a single
  * '&amp;' to be displayed.
  * </p>
  *
  * @param string the new text
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the text 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 setText (String string) {
 	checkWidget();
 	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
 	if (string.equals (text)) return;
 	super.setText (string);
 	int strPtr = createDotNetString (string, true);
 	if (strPtr == 0) error (SWT.ERROR_NO_HANDLES);
 	OS.AccessText_Text (textHandle, strPtr);
 	OS.GCHandle_Free (strPtr);
 //	OS.UIElement_Visibility (textHandle, string.length() == 0 ? OS.Visibility_Collapsed : OS.Visibility_Visible);
 }

 /**
  * Sets the receiver's tool tip text to the argument, which
  * may be null indicating that the default tool tip for the
  * control will be shown. For a control that has a default
  * tool tip, such as the Tree control on Windows, setting
  * the tool tip text to an empty string replaces the default,
  * causing no tool tip text to be shown.
  * <p>
  * The mnemonic indicator (character '&amp;') is not displayed in a tool tip.
  * To display a single '&amp;' in the tool tip, the character '&amp;' can be
  * escaped by doubling it in the string.
  * </p>
  *
  * @param string the new tool tip text (or null)
  *
  * @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 setToolTipText (String string) {
 	checkWidget();
 	toolTipText = string;
 	if (string != null && string.length() == 0) string = null;
 	int strPtr = createDotNetString (string, false);
 	int header = OS.HeaderedContentControl_Header (handle);
 	OS.FrameworkElement_ToolTip (header, strPtr);
 	if (strPtr != 0) OS.GCHandle_Free (strPtr);
 	OS.GCHandle_Free (header);
 }

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2008 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.swt.widgets;


	import org.eclipse.swt.internal.wpf.*;
	import org.eclipse.swt.*;
	import org.eclipse.swt.graphics.*;

	/**
	* Instances of this class represent a selectable user interface object
	* corresponding to a tab for a page in a tab folder.
	* <dl>
	* <dt><b>Styles:</b></dt>
	* <dd>(none)</dd>
	* <dt><b>Events:</b></dt>
	* <dd>(none)</dd>
	* </dl>
	* <p>
	* IMPORTANT: This class is <em>not</em> intended to be subclassed.
	* </p>
	*
	* @see <a href="http://www.eclipse.org/swt/snippets/#tabfolder">TabFolder, TabItem snippets</a>
	* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
	* @noextend This class is not intended to be subclassed by clients.
	*/

	public class TabItem extends Item {
	TabFolder parent;
	Control control;
	String toolTipText;
	int imageHandle, textHandle, contentHandle;


	/**
	* Constructs a new instance of this class given its parent
	* (which must be a <code>TabFolder</code>) and a style value
	* describing its behavior and appearance. The item is added
	* to the end of the items maintained by its parent.
	* <p>
	* The style value is either one of the style constants defined in
	* class <code>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 TabItem (TabFolder parent, int style) {
	super (parent, style);
	this.parent = parent;
	parent.createItem (this, parent.getItemCount ());
	}

	/**
	* Constructs a new instance of this class given its parent
	* (which must be a <code>TabFolder</code>), a style value
	* describing its behavior and appearance, and the index
	* at which to place it in the items maintained by its parent.
	* <p>
	* The style value is either one of the style constants defined in
	* class <code>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
	* @param index the zero-relative index to store the receiver in its parent
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
	* <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</li>
	* </ul>
	* @exception 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 TabItem (TabFolder parent, int style, int index) {
	super (parent, style);
	this.parent = parent;
	parent.createItem (this, index);
	}

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

	void createHandle () {
	handle = OS.gcnew_TabItem ();
	if (handle == 0) error (SWT.ERROR_NO_HANDLES);
	imageHandle = OS.gcnew_Image ();
	if (imageHandle == 0) error (SWT.ERROR_NO_HANDLES);
	OS.Image_Stretch (imageHandle, OS.Stretch_None);
	int thickness = OS.gcnew_Thickness (0, 0, 3, 0);
	if (thickness == 0) error (SWT.ERROR_NO_HANDLES);
	OS.FrameworkElement_Margin (imageHandle, thickness);
	OS.GCHandle_Free (thickness);
	OS.UIElement_Visibility (imageHandle, OS.Visibility_Collapsed);
	textHandle = OS.gcnew_AccessText ();
	if (textHandle == 0) error (SWT.ERROR_NO_HANDLES);
	OS.FrameworkElement_VerticalAlignment (textHandle, OS.VerticalAlignment_Center);
	int panel = OS.gcnew_StackPanel ();
	if (panel == 0) error (SWT.ERROR_NO_HANDLES);
	OS.StackPanel_Orientation (panel, OS.Orientation_Horizontal);
	thickness = OS.gcnew_Thickness (1, 1, 1, 1);
	if (thickness == 0) error (SWT.ERROR_NO_HANDLES);
	OS.FrameworkElement_Margin (panel, thickness);
	OS.GCHandle_Free(thickness);
	int children = OS.Panel_Children (panel);
	OS.UIElementCollection_Add (children, imageHandle);
	OS.UIElementCollection_Add (children, textHandle);
	OS.HeaderedContentControl_Header (handle, panel);
	OS.GCHandle_Free (children);
	OS.GCHandle_Free (panel);
	contentHandle = OS.gcnew_Canvas ();
	if (contentHandle == 0) error (SWT.ERROR_NO_HANDLES);
	OS.ContentControl_Content (handle, contentHandle);
	}

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

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

	/**
	* Returns a rectangle describing the receiver's size and location
	* relative to its parent.
	*
	* @return the receiver's bounding rectangle
	*
	* @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 3.4
	*/
	public Rectangle getBounds () {
	checkWidget ();
	int topHandle = handle;
	int point = OS.gcnew_Point (0, 0);
	if (point == 0) error (SWT.ERROR_NO_HANDLES);
	int location = OS.UIElement_TranslatePoint (topHandle, point, parent.handle);
	int x = (int) OS.Point_X (location);
	int y = (int) OS.Point_Y (location);
	OS.GCHandle_Free (point);
	OS.GCHandle_Free (location);
	int width = (int) OS.FrameworkElement_ActualWidth (topHandle);
	int height = (int) OS.FrameworkElement_ActualHeight (topHandle);
	return new Rectangle (x, y, width, height);
	}

	/**
	* Returns the control that is used to fill the client area of
	* the tab folder when the user selects the tab item. If no
	* control has been set, return <code>null</code>.
	* <p>
	* @return the control
	*
	* @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 Control getControl () {
	checkWidget();
	return control;
	}

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

	Control getWidgetControl () {
	return parent;
	}

	/**
	* Returns the receiver's tool tip text, or null if it has
	* not been set.
	*
	* @return the receiver's tool tip text
	*
	* @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 String getToolTipText () {
	checkWidget();
	return toolTipText;
	}

	void HandleSizeChanged (int sender, int e) {
	if (!checkEvent (e)) return;
	if (control == null) return;
	control.setBounds (parent.getClientArea ());
	}

	void hookEvents () {
	super.hookEvents ();
	int handler = OS.gcnew_SizeChangedEventHandler (jniRef, "HandleSizeChanged");
	OS.FrameworkElement_SizeChanged (contentHandle, handler);
	OS.GCHandle_Free (handler);
	}

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

	void releaseHandle () {
	super.releaseHandle ();
	if (handle != 0) OS.GCHandle_Free (handle);
	handle = 0;
	parent = null;
	if (textHandle != 0) OS.GCHandle_Free (textHandle);
	textHandle = 0;
	if (imageHandle !=0 )OS.GCHandle_Free (imageHandle);
	imageHandle = 0;
	if (contentHandle != 0) OS.GCHandle_Free (contentHandle);
	contentHandle = 0;
	}

	void releaseParent () {
	super.releaseParent ();
	int index = parent.indexOf (this);
	if (index == parent.getSelectionIndex ()) {
	if (control != null) control.setVisible (false);
	}
	}

	void releaseWidget () {
	super.releaseWidget ();
	control = null;
	toolTipText = null;
	}

	/**
	* Sets the control that is used to fill the client area of
	* the tab folder when the user selects the tab item.
	* <p>
	* @param control the new control (or null)
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li>
	* <li>ERROR_INVALID_PARENT - if the control is not in the same widget tree</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 setControl (Control control) {
	checkWidget();
	if (control != null) {
	if (control.isDisposed()) error (SWT.ERROR_INVALID_ARGUMENT);
	if (control.parent != parent) error (SWT.ERROR_INVALID_PARENT);
	}
	if (this.control != null && this.control.isDisposed ()) {
	this.control = null;
	}
	Control oldControl = this.control, newControl = control;
	this.control = control;
	int index = parent.indexOf (this), selectionIndex = parent.getSelectionIndex();
	if (index != selectionIndex) {
	if (newControl != null) {
	if (selectionIndex != -1) {
	Control selectedControl = parent.getItem(selectionIndex).getControl();
	if (selectedControl == newControl) return;
	}
	newControl.setVisible(false);
	return;
	}
	}
	if (newControl != null) {
	newControl.setBounds (parent.getClientArea ());
	newControl.setVisible (true);
	}
	if (oldControl != null) oldControl.setVisible (false);
	}

	public void setImage (Image image) {
	checkWidget();
	super.setImage (image);
	OS.Image_Source (imageHandle, image != null ? image.handle : 0);
	OS.UIElement_Visibility (imageHandle, image != null ? OS.Visibility_Visible : OS.Visibility_Collapsed);
	}

	/**
	* Sets the receiver's text. The string may include
	* the mnemonic character.
	* </p>
	* <p>
	* Mnemonics are indicated by an '&' that causes the next
	* character to be the mnemonic. When the user presses a
	* key sequence that matches the mnemonic, a selection
	* event occurs. On most platforms, the mnemonic appears
	* underlined but may be emphasised in a platform specific
	* manner. The mnemonic indicator character '&' can be
	* escaped by doubling it in the string, causing a single
	* '&' to be displayed.
	* </p>
	*
	* @param string the new text
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the text 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 setText (String string) {
	checkWidget();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (string.equals (text)) return;
	super.setText (string);
	int strPtr = createDotNetString (string, true);
	if (strPtr == 0) error (SWT.ERROR_NO_HANDLES);
	OS.AccessText_Text (textHandle, strPtr);
	OS.GCHandle_Free (strPtr);
	// OS.UIElement_Visibility (textHandle, string.length() == 0 ? OS.Visibility_Collapsed : OS.Visibility_Visible);
	}

	/**
	* Sets the receiver's tool tip text to the argument, which
	* may be null indicating that the default tool tip for the
	* control will be shown. For a control that has a default
	* tool tip, such as the Tree control on Windows, setting
	* the tool tip text to an empty string replaces the default,
	* causing no tool tip text to be shown.
	* <p>
	* The mnemonic indicator (character '&') is not displayed in a tool tip.
	* To display a single '&' in the tool tip, the character '&' can be
	* escaped by doubling it in the string.
	* </p>
	*
	* @param string the new tool tip text (or null)
	*
	* @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 setToolTipText (String string) {
	checkWidget();
	toolTipText = string;
	if (string != null && string.length() == 0) string = null;
	int strPtr = createDotNetString (string, false);
	int header = OS.HeaderedContentControl_Header (handle);
	OS.FrameworkElement_ToolTip (header, strPtr);
	if (strPtr != 0) OS.GCHandle_Free (strPtr);
	OS.GCHandle_Free (header);
	}

	}