bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/widgets/Label.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2012 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.*;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.internal.cocoa.*;

 /**
  * Instances of this class represent a non-selectable
  * user interface object that displays a string or image.
  * When SEPARATOR is specified, displays a single
  * vertical or horizontal line.
  * <p>
  * Shadow styles are hints and may not be honored
  * by the platform.  To create a separator label
  * with the default shadow style for the platform,
  * do not specify a shadow style.
  * </p>
  * <dl>
  * <dt><b>Styles:</b></dt>
  * <dd>SEPARATOR, HORIZONTAL, VERTICAL</dd>
  * <dd>SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd>
  * <dd>CENTER, LEFT, RIGHT, WRAP</dd>
  * <dt><b>Events:</b></dt>
  * <dd>(none)</dd>
  * </dl>
  * <p>
  * Note: Only one of SHADOW_IN, SHADOW_OUT and SHADOW_NONE may be specified.
  * SHADOW_NONE is a HINT. Only one of HORIZONTAL and VERTICAL may be specified.
  * Only one of CENTER, LEFT and RIGHT may be specified.
  * </p><p>
  * IMPORTANT: This class is <em>not</em> intended to be subclassed.
  * </p>
  *
  * @see <a href="http://www.eclipse.org/swt/snippets/#label">Label snippets</a>
  * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</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 Label extends Control {
 	String text;
 	Image image;
 	boolean isImage;
 	NSTextField textView;
 	NSImageView imageView;
 	NSView separator;

 /**
  * 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#SEPARATOR
  * @see SWT#HORIZONTAL
  * @see SWT#VERTICAL
  * @see SWT#SHADOW_IN
  * @see SWT#SHADOW_OUT
  * @see SWT#SHADOW_NONE
  * @see SWT#CENTER
  * @see SWT#LEFT
  * @see SWT#RIGHT
  * @see SWT#WRAP
  * @see Widget#checkSubclass
  * @see Widget#getStyle
  */
 public Label (Composite parent, int style) {
 	super (parent, checkStyle (style));
 }

 @Override
 long /*int*/ accessibleHandle() {
 	return eventView().id;
 }

 @Override
 boolean accessibilityIsIgnored(long /*int*/ id, long /*int*/ sel) {
 	if (id == view.id) return true;
 	return super.accessibilityIsIgnored(id, sel);
 }

 @Override
 void addRelation (Control control) {
 	if (!control.isDescribedByLabel ()) return;

 	if (textView != null) {
 		NSObject accessibleElement = control.focusView();

 		if (accessibleElement instanceof NSControl) {
 			NSControl viewAsControl = (NSControl)accessibleElement;
 			if (viewAsControl.cell() != null) accessibleElement = viewAsControl.cell();
 		}

 		accessibleElement.accessibilitySetOverrideValue(textView.cell(), OS.NSAccessibilityTitleUIElementAttribute);
 		NSArray controlArray = NSArray.arrayWithObject(accessibleElement);
 		textView.cell().accessibilitySetOverrideValue(controlArray, OS.NSAccessibilityServesAsTitleForUIElementsAttribute);
 	}
 }

 static int checkStyle (int style) {
 	style |= SWT.NO_FOCUS;
 	if ((style & SWT.SEPARATOR) != 0) {
 		style = checkBits (style, SWT.VERTICAL, SWT.HORIZONTAL, 0, 0, 0, 0);
 		return checkBits (style, SWT.SHADOW_OUT, SWT.SHADOW_IN, SWT.SHADOW_NONE, 0, 0, 0);
 	}
 	return checkBits (style, SWT.LEFT, SWT.CENTER, SWT.RIGHT, 0, 0, 0);
 }

 @Override
 public Point computeSize (int wHint, int hHint, boolean changed) {
 	checkWidget();
 	int width = DEFAULT_WIDTH;
 	int height = DEFAULT_HEIGHT;
 	if ((style & SWT.SEPARATOR) != 0) {
 		double /*float*/ lineWidth = ((NSBox)view).borderWidth ();
 		if ((style & SWT.HORIZONTAL) != 0) {
 			height = (int)Math.ceil (lineWidth * 2);
 		} else {
 			width = (int)Math.ceil (lineWidth * 2);
 		}
 		if (wHint != SWT.DEFAULT) width = wHint;
 		if (hHint != SWT.DEFAULT) height = hHint;
 		int border = getBorderWidth ();
 		width += border * 2; height += border * 2;
 		return new Point (width, height);
 	}
 	if (isImage) {
 		if (image != null) {
 			NSImage nsimage = image.handle;
 			NSSize size = nsimage.size ();
 			width = (int)size.width;
 			height = (int)size.height;
 		} else {
 			width = height = 0;
 		}
 	} else {
 		NSSize size = null;
 		if ((style & SWT.WRAP) != 0 && wHint != SWT.DEFAULT) {
 			NSRect rect = new NSRect ();
 			rect.width = wHint;
 			rect.height = hHint != SWT.DEFAULT ? hHint : Float.MAX_VALUE;
 			size = textView.cell ().cellSizeForBounds (rect);
 		} else {
 			size = textView.cell ().cellSize ();
 		}
 		width = (int)Math.ceil (size.width);
 		height = (int)Math.ceil (size.height);
 	}
 	if (wHint != SWT.DEFAULT) width = wHint;
 	if (hHint != SWT.DEFAULT) height = hHint;
 	return new Point (width, height);
 }

 @Override
 void createHandle () {
 	state |= THEME_BACKGROUND;
 	NSBox widget = (NSBox)new SWTBox().alloc();
 	if ((style & SWT.SEPARATOR) != 0) {
 		/*
 		 * Feature in Cocoa: Separator control decides how to orient itself
 		 * based on the width and height. If height > width it orients
 		 * vertically, else it orients horizontally.
 		 * Fix is to have two native controls to implement the separator label.
 		 * The top control (Custom NSBox) honors the bounds set by the
 		 * user and the inner one (Separator NSBox) creates the separator
 		 * with the correct orientation.
 		 */
 		NSRect rect = new NSRect();
 		rect.width = DEFAULT_WIDTH;
 		rect.height = DEFAULT_HEIGHT;

 		widget.initWithFrame(rect);
 		widget.setTitle(NSString.string());
 		widget.setBorderType(OS.NSNoBorder);
 		widget.setBoxType (OS.NSBoxCustom);
 		widget.setContentViewMargins (new NSSize());

 		double /*float*/ lineWidth = widget.borderWidth ();
 		if ((style & SWT.HORIZONTAL) != 0) {
 			rect.height = (int)Math.ceil (lineWidth * 2);
 			rect.y = (DEFAULT_HEIGHT / 2) - (rect.height / 2);
 		} else {
 			rect.width = (int)Math.ceil (lineWidth * 2);
 			rect.x = (DEFAULT_WIDTH / 2) - (rect.width / 2);
 		}

 		NSBox separator = (NSBox) new SWTBox().alloc();
 		separator.initWithFrame(rect);
 		separator.setBoxType(OS.NSBoxSeparator);
 		if ((style & SWT.HORIZONTAL) != 0) {
 			separator.setAutoresizingMask(OS.NSViewWidthSizable | OS.NSViewMinYMargin | OS.NSViewMaxYMargin);
 		} else {
 			separator.setAutoresizingMask(OS.NSViewHeightSizable| OS.NSViewMinXMargin | OS.NSViewMaxXMargin);
 		}

 		NSView child = (NSView) new NSView().alloc().init();
 		separator.setContentView(child);
 		child.release();

 		widget.addSubview(separator);
 		this.separator = separator;
 	} else {
 		widget.init();
 		widget.setTitle(NSString.string());
 		widget.setBorderType(OS.NSNoBorder);
 		widget.setBorderWidth (0);
 		widget.setBoxType (OS.NSBoxCustom);
 		NSSize offsetSize = new NSSize ();
 		widget.setContentViewMargins (offsetSize);

 		NSImageView imageWidget = (NSImageView) new SWTImageView ().alloc ();
 		imageWidget.init();
 		imageWidget.setImageScaling (OS.NSScaleNone);

 		NSTextField textWidget = (NSTextField)new SWTTextField().alloc();
 		textWidget.init();
 		textWidget.setBordered(false);
 		textWidget.setEditable(false);
 		textWidget.setDrawsBackground(false);
 		NSTextFieldCell cell = new NSTextFieldCell(textWidget.cell());
 		cell.setWraps ((style & SWT.WRAP) != 0);

 		widget.addSubview(imageWidget);
 		widget.addSubview(textWidget);
 		widget.setContentView(textWidget);

 		imageView = imageWidget;
 		textView = textWidget;
 		_setAlignment();
 	}
 	view = widget;
 }

 @Override
 void createWidget() {
 	text = "";
 	super.createWidget ();
 }

 NSAttributedString createString() {
 	NSAttributedString attribStr = createString(text, null, foreground, style, (style & SWT.WRAP) != 0, true, true);
 	attribStr.autorelease();
 	return attribStr;
 }

 @Override
 NSFont defaultNSFont () {
 	return display.textFieldFont;
 }

 @Override
 void deregister () {
 	super.deregister ();
 	if (textView != null) {
 		display.removeWidget(textView);
 		display.removeWidget(textView.cell());
 	}
 	if (imageView != null) {
 		display.removeWidget (imageView);
 		display.removeWidget (imageView.cell());
 	}
 	if (separator != null) display.removeWidget(separator);
 }

 @Override
 void drawBackground (long /*int*/ id, NSGraphicsContext context, NSRect rect) {
 	if (id != view.id) return;
 	fillBackground(view, context, rect, -1);
 }

 @Override
 long /*int*/ imageView() {
 	return imageView.id;
 };

 @Override
 boolean drawsBackground() {
 	return background != null || backgroundImage != null;
 }

 @Override
 NSView eventView () {
 	return ((NSBox)view).contentView();
 }

 /**
  * Returns a value which describes the position of the
  * text or image in the receiver. The value will be one of
  * <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>
  * unless the receiver is a <code>SEPARATOR</code> label, in
  * which case, <code>NONE</code> is returned.
  *
  * @return the alignment
  *
  * @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 getAlignment () {
 	checkWidget();
 	if ((style & SWT.SEPARATOR) != 0) return SWT.LEFT;
 	if ((style & SWT.CENTER) != 0) return SWT.CENTER;
 	if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
 	return SWT.LEFT;
 }

 /**
  * Returns the receiver's image if it has one, or null
  * if it does not.
  *
  * @return the receiver's image
  *
  * @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 Image getImage () {
 	checkWidget();
 	return image;
 }

 @Override
 String getNameText () {
 	return getText ();
 }

 /**
  * Returns the receiver's text, which will be an empty
  * string if it has never been set or if the receiver is
  * a <code>SEPARATOR</code> label.
  *
  * @return the receiver's 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 getText () {
 	checkWidget();
 	if ((style & SWT.SEPARATOR) != 0) return "";
 	return text;
 }

 @Override
 boolean isDescribedByLabel () {
 	return false;
 }

 @Override
 void register () {
 	super.register ();
 	if (textView != null) {
 		display.addWidget (textView, this);
 		display.addWidget (textView.cell(), this);
 	}
 	if (imageView != null) {
 		display.addWidget (imageView, this);
 		display.addWidget (imageView.cell(), this);
 	}
 	if (separator != null) display.addWidget(separator, this);
 }

 @Override
 void releaseHandle () {
 	super.releaseHandle ();
 	if (textView != null) textView.release();
 	if (imageView != null) imageView.release();
 	if (separator != null) separator.release();
 	textView = null;
 	imageView = null;
 	separator = null;
 }

 /*
  * Remove "Labeled by" relations from the receiver.
  */
 @Override
 void removeRelation () {
 	if (textView != null) {
 		textView.cell().accessibilitySetOverrideValue(null, OS.NSAccessibilityServesAsTitleForUIElementsAttribute);
 	}
 }

 /**
  * Controls how text and images will be displayed in the receiver.
  * The argument should be one of <code>LEFT</code>, <code>RIGHT</code>
  * or <code>CENTER</code>.  If the receiver is a <code>SEPARATOR</code>
  * label, the argument is ignored and the alignment is not changed.
  *
  * @param alignment the new alignment
  *
  * @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 setAlignment (int alignment) {
 	checkWidget();
 	if ((style & SWT.SEPARATOR) != 0) return;
 	if ((alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER)) == 0) return;
 	style &= ~(SWT.LEFT | SWT.RIGHT | SWT.CENTER);
 	style |= alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER);
 	_setAlignment();
 }

 void _setAlignment() {
 	if (image != null) {
 		if ((style & SWT.RIGHT) != 0) imageView.setImageAlignment(OS.NSImageAlignRight);
 		if ((style & SWT.LEFT) != 0) imageView.setImageAlignment(OS.NSImageAlignLeft);
 		if ((style & SWT.CENTER) != 0) imageView.setImageAlignment(OS.NSImageAlignCenter);
 	}
 	if (text != null) {
 		NSCell cell = new NSCell(textView.cell());
 		cell.setAttributedStringValue(createString());
 	}
 }

 @Override
 void setFont(NSFont font) {
 	if (textView != null) {
 		NSCell cell = new NSCell(textView.cell());
 		cell.setAttributedStringValue(createString());
 		textView.setFont (font);
 	}
 }

 @Override
 void setForeground (double /*float*/ [] color) {
 	if ((style & SWT.SEPARATOR) != 0) return;
 	NSCell cell = new NSCell(textView.cell());
 	cell.setAttributedStringValue(createString());
 }

 @Override
 boolean setTabItemFocus () {
 	return false;
 }

 /**
  * Sets the receiver's image to the argument, which may be
  * null indicating that no image should be displayed.
  *
  * @param image the image to display on the receiver (may be null)
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  */
 public void setImage (Image image) {
 	checkWidget();
 	if ((style & SWT.SEPARATOR) != 0) return;
 	if (image != null && image.isDisposed ()) {
 		error (SWT.ERROR_INVALID_ARGUMENT);
 	}
 	this.image = image;
 	isImage = true;

 	/*
 	 * Feature in Cocoa.  If the NSImage object being set into the view is
 	 * the same NSImage object that is already there then the new image is
 	 * not taken.  This results in the view's image not changing even if the
 	 * NSImage object's content has changed since it was last set into the
 	 * view.  The workaround is to temporarily set the view's image to null
 	 * so that the new image will then be taken.
 	 */
 	if (image != null) {
 		NSImage current = imageView.image ();
 		if (current != null && current.id == image.handle.id) {
 			imageView.setImage (null);
 		}
 	}
 	imageView.setImage(image != null ? image.handle : null);
 	((NSBox)view).setContentView(imageView);
 }

 /**
  * Sets the receiver's text.
  * <p>
  * This method sets the widget label.  The label may include
  * the mnemonic character and line delimiters.
  * </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, focus is assigned
  * to the control that follows the label. 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>
  * <p>
  * Note: If control characters like '\n', '\t' etc. are used
  * in the string, then the behavior is platform dependent.
  * </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 ((style & SWT.SEPARATOR) != 0) return;
 	isImage = false;
 	text = string;
 	NSCell cell = new NSCell(textView.cell());
 	cell.setAttributedStringValue(createString());
 	((NSBox)view).setContentView(textView);
 }


 }
	/*******************************************************************************
	* Copyright (c) 2000, 2012 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.*;
	import org.eclipse.swt.graphics.*;
	import org.eclipse.swt.internal.cocoa.*;

	/**
	* Instances of this class represent a non-selectable
	* user interface object that displays a string or image.
	* When SEPARATOR is specified, displays a single
	* vertical or horizontal line.
	* <p>
	* Shadow styles are hints and may not be honored
	* by the platform. To create a separator label
	* with the default shadow style for the platform,
	* do not specify a shadow style.
	* </p>
	* <dl>
	* <dt><b>Styles:</b></dt>
	* <dd>SEPARATOR, HORIZONTAL, VERTICAL</dd>
	* <dd>SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd>
	* <dd>CENTER, LEFT, RIGHT, WRAP</dd>
	* <dt><b>Events:</b></dt>
	* <dd>(none)</dd>
	* </dl>
	* <p>
	* Note: Only one of SHADOW_IN, SHADOW_OUT and SHADOW_NONE may be specified.
	* SHADOW_NONE is a HINT. Only one of HORIZONTAL and VERTICAL may be specified.
	* Only one of CENTER, LEFT and RIGHT may be specified.
	* </p><p>
	* IMPORTANT: This class is <em>not</em> intended to be subclassed.
	* </p>
	*
	* @see <a href="http://www.eclipse.org/swt/snippets/#label">Label snippets</a>
	* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</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 Label extends Control {
	String text;
	Image image;
	boolean isImage;
	NSTextField textView;
	NSImageView imageView;
	NSView separator;

	/**
	* 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#SEPARATOR
	* @see SWT#HORIZONTAL
	* @see SWT#VERTICAL
	* @see SWT#SHADOW_IN
	* @see SWT#SHADOW_OUT
	* @see SWT#SHADOW_NONE
	* @see SWT#CENTER
	* @see SWT#LEFT
	* @see SWT#RIGHT
	* @see SWT#WRAP
	* @see Widget#checkSubclass
	* @see Widget#getStyle
	*/
	public Label (Composite parent, int style) {
	super (parent, checkStyle (style));
	}

	@Override
	long /int/ accessibleHandle() {
	return eventView().id;
	}

	@Override
	boolean accessibilityIsIgnored(long /int/ id, long /int/ sel) {
	if (id == view.id) return true;
	return super.accessibilityIsIgnored(id, sel);
	}

	@Override
	void addRelation (Control control) {
	if (!control.isDescribedByLabel ()) return;

	if (textView != null) {
	NSObject accessibleElement = control.focusView();

	if (accessibleElement instanceof NSControl) {
	NSControl viewAsControl = (NSControl)accessibleElement;
	if (viewAsControl.cell() != null) accessibleElement = viewAsControl.cell();
	}

	accessibleElement.accessibilitySetOverrideValue(textView.cell(), OS.NSAccessibilityTitleUIElementAttribute);
	NSArray controlArray = NSArray.arrayWithObject(accessibleElement);
	textView.cell().accessibilitySetOverrideValue(controlArray, OS.NSAccessibilityServesAsTitleForUIElementsAttribute);
	}
	}

	static int checkStyle (int style) {
	style \|= SWT.NO_FOCUS;
	if ((style & SWT.SEPARATOR) != 0) {
	style = checkBits (style, SWT.VERTICAL, SWT.HORIZONTAL, 0, 0, 0, 0);
	return checkBits (style, SWT.SHADOW_OUT, SWT.SHADOW_IN, SWT.SHADOW_NONE, 0, 0, 0);
	}
	return checkBits (style, SWT.LEFT, SWT.CENTER, SWT.RIGHT, 0, 0, 0);
	}

	@Override
	public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget();
	int width = DEFAULT_WIDTH;
	int height = DEFAULT_HEIGHT;
	if ((style & SWT.SEPARATOR) != 0) {
	double /float/ lineWidth = ((NSBox)view).borderWidth ();
	if ((style & SWT.HORIZONTAL) != 0) {
	height = (int)Math.ceil (lineWidth * 2);
	} else {
	width = (int)Math.ceil (lineWidth * 2);
	}
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	int border = getBorderWidth ();
	width += border * 2; height += border * 2;
	return new Point (width, height);
	}
	if (isImage) {
	if (image != null) {
	NSImage nsimage = image.handle;
	NSSize size = nsimage.size ();
	width = (int)size.width;
	height = (int)size.height;
	} else {
	width = height = 0;
	}
	} else {
	NSSize size = null;
	if ((style & SWT.WRAP) != 0 && wHint != SWT.DEFAULT) {
	NSRect rect = new NSRect ();
	rect.width = wHint;
	rect.height = hHint != SWT.DEFAULT ? hHint : Float.MAX_VALUE;
	size = textView.cell ().cellSizeForBounds (rect);
	} else {
	size = textView.cell ().cellSize ();
	}
	width = (int)Math.ceil (size.width);
	height = (int)Math.ceil (size.height);
	}
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	return new Point (width, height);
	}

	@Override
	void createHandle () {
	state \|= THEME_BACKGROUND;
	NSBox widget = (NSBox)new SWTBox().alloc();
	if ((style & SWT.SEPARATOR) != 0) {
	/*
	* Feature in Cocoa: Separator control decides how to orient itself
	* based on the width and height. If height > width it orients
	* vertically, else it orients horizontally.
	* Fix is to have two native controls to implement the separator label.
	* The top control (Custom NSBox) honors the bounds set by the
	* user and the inner one (Separator NSBox) creates the separator
	* with the correct orientation.
	*/
	NSRect rect = new NSRect();
	rect.width = DEFAULT_WIDTH;
	rect.height = DEFAULT_HEIGHT;

	widget.initWithFrame(rect);
	widget.setTitle(NSString.string());
	widget.setBorderType(OS.NSNoBorder);
	widget.setBoxType (OS.NSBoxCustom);
	widget.setContentViewMargins (new NSSize());

	double /float/ lineWidth = widget.borderWidth ();
	if ((style & SWT.HORIZONTAL) != 0) {
	rect.height = (int)Math.ceil (lineWidth * 2);
	rect.y = (DEFAULT_HEIGHT / 2) - (rect.height / 2);
	} else {
	rect.width = (int)Math.ceil (lineWidth * 2);
	rect.x = (DEFAULT_WIDTH / 2) - (rect.width / 2);
	}

	NSBox separator = (NSBox) new SWTBox().alloc();
	separator.initWithFrame(rect);
	separator.setBoxType(OS.NSBoxSeparator);
	if ((style & SWT.HORIZONTAL) != 0) {
	separator.setAutoresizingMask(OS.NSViewWidthSizable \| OS.NSViewMinYMargin \| OS.NSViewMaxYMargin);
	} else {
	separator.setAutoresizingMask(OS.NSViewHeightSizable\| OS.NSViewMinXMargin \| OS.NSViewMaxXMargin);
	}

	NSView child = (NSView) new NSView().alloc().init();
	separator.setContentView(child);
	child.release();

	widget.addSubview(separator);
	this.separator = separator;
	} else {
	widget.init();
	widget.setTitle(NSString.string());
	widget.setBorderType(OS.NSNoBorder);
	widget.setBorderWidth (0);
	widget.setBoxType (OS.NSBoxCustom);
	NSSize offsetSize = new NSSize ();
	widget.setContentViewMargins (offsetSize);

	NSImageView imageWidget = (NSImageView) new SWTImageView ().alloc ();
	imageWidget.init();
	imageWidget.setImageScaling (OS.NSScaleNone);

	NSTextField textWidget = (NSTextField)new SWTTextField().alloc();
	textWidget.init();
	textWidget.setBordered(false);
	textWidget.setEditable(false);
	textWidget.setDrawsBackground(false);
	NSTextFieldCell cell = new NSTextFieldCell(textWidget.cell());
	cell.setWraps ((style & SWT.WRAP) != 0);

	widget.addSubview(imageWidget);
	widget.addSubview(textWidget);
	widget.setContentView(textWidget);

	imageView = imageWidget;
	textView = textWidget;
	_setAlignment();
	}
	view = widget;
	}

	@Override
	void createWidget() {
	text = "";
	super.createWidget ();
	}

	NSAttributedString createString() {
	NSAttributedString attribStr = createString(text, null, foreground, style, (style & SWT.WRAP) != 0, true, true);
	attribStr.autorelease();
	return attribStr;
	}

	@Override
	NSFont defaultNSFont () {
	return display.textFieldFont;
	}

	@Override
	void deregister () {
	super.deregister ();
	if (textView != null) {
	display.removeWidget(textView);
	display.removeWidget(textView.cell());
	}
	if (imageView != null) {
	display.removeWidget (imageView);
	display.removeWidget (imageView.cell());
	}
	if (separator != null) display.removeWidget(separator);
	}

	@Override
	void drawBackground (long /int/ id, NSGraphicsContext context, NSRect rect) {
	if (id != view.id) return;
	fillBackground(view, context, rect, -1);
	}

	@Override
	long /int/ imageView() {
	return imageView.id;
	};

	@Override
	boolean drawsBackground() {
	return background != null \|\| backgroundImage != null;
	}

	@Override
	NSView eventView () {
	return ((NSBox)view).contentView();
	}

	/**
	* Returns a value which describes the position of the
	* text or image in the receiver. The value will be one of
	* <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>
	* unless the receiver is a <code>SEPARATOR</code> label, in
	* which case, <code>NONE</code> is returned.
	*
	* @return the alignment
	*
	* @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 getAlignment () {
	checkWidget();
	if ((style & SWT.SEPARATOR) != 0) return SWT.LEFT;
	if ((style & SWT.CENTER) != 0) return SWT.CENTER;
	if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
	return SWT.LEFT;
	}

	/**
	* Returns the receiver's image if it has one, or null
	* if it does not.
	*
	* @return the receiver's image
	*
	* @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 Image getImage () {
	checkWidget();
	return image;
	}

	@Override
	String getNameText () {
	return getText ();
	}

	/**
	* Returns the receiver's text, which will be an empty
	* string if it has never been set or if the receiver is
	* a <code>SEPARATOR</code> label.
	*
	* @return the receiver's 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 getText () {
	checkWidget();
	if ((style & SWT.SEPARATOR) != 0) return "";
	return text;
	}

	@Override
	boolean isDescribedByLabel () {
	return false;
	}

	@Override
	void register () {
	super.register ();
	if (textView != null) {
	display.addWidget (textView, this);
	display.addWidget (textView.cell(), this);
	}
	if (imageView != null) {
	display.addWidget (imageView, this);
	display.addWidget (imageView.cell(), this);
	}
	if (separator != null) display.addWidget(separator, this);
	}

	@Override
	void releaseHandle () {
	super.releaseHandle ();
	if (textView != null) textView.release();
	if (imageView != null) imageView.release();
	if (separator != null) separator.release();
	textView = null;
	imageView = null;
	separator = null;
	}

	/*
	* Remove "Labeled by" relations from the receiver.
	*/
	@Override
	void removeRelation () {
	if (textView != null) {
	textView.cell().accessibilitySetOverrideValue(null, OS.NSAccessibilityServesAsTitleForUIElementsAttribute);
	}
	}

	/**
	* Controls how text and images will be displayed in the receiver.
	* The argument should be one of <code>LEFT</code>, <code>RIGHT</code>
	* or <code>CENTER</code>. If the receiver is a <code>SEPARATOR</code>
	* label, the argument is ignored and the alignment is not changed.
	*
	* @param alignment the new alignment
	*
	* @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 setAlignment (int alignment) {
	checkWidget();
	if ((style & SWT.SEPARATOR) != 0) return;
	if ((alignment & (SWT.LEFT \| SWT.RIGHT \| SWT.CENTER)) == 0) return;
	style &= ~(SWT.LEFT \| SWT.RIGHT \| SWT.CENTER);
	style \|= alignment & (SWT.LEFT \| SWT.RIGHT \| SWT.CENTER);
	_setAlignment();
	}

	void _setAlignment() {
	if (image != null) {
	if ((style & SWT.RIGHT) != 0) imageView.setImageAlignment(OS.NSImageAlignRight);
	if ((style & SWT.LEFT) != 0) imageView.setImageAlignment(OS.NSImageAlignLeft);
	if ((style & SWT.CENTER) != 0) imageView.setImageAlignment(OS.NSImageAlignCenter);
	}
	if (text != null) {
	NSCell cell = new NSCell(textView.cell());
	cell.setAttributedStringValue(createString());
	}
	}

	@Override
	void setFont(NSFont font) {
	if (textView != null) {
	NSCell cell = new NSCell(textView.cell());
	cell.setAttributedStringValue(createString());
	textView.setFont (font);
	}
	}

	@Override
	void setForeground (double /float/ [] color) {
	if ((style & SWT.SEPARATOR) != 0) return;
	NSCell cell = new NSCell(textView.cell());
	cell.setAttributedStringValue(createString());
	}

	@Override
	boolean setTabItemFocus () {
	return false;
	}

	/**
	* Sets the receiver's image to the argument, which may be
	* null indicating that no image should be displayed.
	*
	* @param image the image to display on the receiver (may be null)
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
	* </ul>
	* @exception SWTException <ul>
	* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	* </ul>
	*/
	public void setImage (Image image) {
	checkWidget();
	if ((style & SWT.SEPARATOR) != 0) return;
	if (image != null && image.isDisposed ()) {
	error (SWT.ERROR_INVALID_ARGUMENT);
	}
	this.image = image;
	isImage = true;

	/*
	* Feature in Cocoa. If the NSImage object being set into the view is
	* the same NSImage object that is already there then the new image is
	* not taken. This results in the view's image not changing even if the
	* NSImage object's content has changed since it was last set into the
	* view. The workaround is to temporarily set the view's image to null
	* so that the new image will then be taken.
	*/
	if (image != null) {
	NSImage current = imageView.image ();
	if (current != null && current.id == image.handle.id) {
	imageView.setImage (null);
	}
	}
	imageView.setImage(image != null ? image.handle : null);
	((NSBox)view).setContentView(imageView);
	}

	/**
	* Sets the receiver's text.
	* <p>
	* This method sets the widget label. The label may include
	* the mnemonic character and line delimiters.
	* </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, focus is assigned
	* to the control that follows the label. 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>
	* <p>
	* Note: If control characters like '\n', '\t' etc. are used
	* in the string, then the behavior is platform dependent.
	* </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 ((style & SWT.SEPARATOR) != 0) return;
	isImage = false;
	text = string;
	NSCell cell = new NSCell(textView.cell());
	cell.setAttributedStringValue(createString());
	((NSBox)view).setContentView(textView);
	}


	}