bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Group.java - platform/eclipse.platform.swt - Git at Google

 package org.eclipse.swt.widgets;

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

 import org.eclipse.swt.internal.*;
 import org.eclipse.swt.internal.win32.*;
 import org.eclipse.swt.*;
 import org.eclipse.swt.graphics.*;

 /**
  * Instances of this class provide an etched border
  * with an optional title.
  * <p>
  * Shadow styles are hints and may not be honoured
  * by the platform.  To create a group with the
  * default shadow style for the platform, do not
  * specify a shadow style.
  * <dl>
  * <dt><b>Styles:</b></dt>
  * <dd>SHADOW_ETCHED_IN, SHADOW_ETCHED_OUT, SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd>
  * <dt><b>Events:</b></dt>
  * <dd>(none)</dd>
  * </dl>
  * <p>
  * IMPORTANT: This class is <em>not</em> intended to be subclassed.
  * </p>
  */

 public class Group extends Composite {
 	static final int GroupProc;
 	static final TCHAR GroupClass = new TCHAR (0, "BUTTON", true);
 	static {
 		WNDCLASS lpWndClass = new WNDCLASS ();
 		OS.GetClassInfo (0, GroupClass, lpWndClass);
 		GroupProc = lpWndClass.lpfnWndProc;
 	}

 /**
  * Constructs a new instance of this class given its parent
  * and a style value describing its behavior and appearance.
  * <p>
  * The style value is either one of the style constants defined in
  * class <code>SWT</code> which is applicable to instances of this
  * class, or must be built by <em>bitwise OR</em>'ing together
  * (that is, using the <code>int</code> "|" operator) two or more
  * of those <code>SWT</code> style constants. The class description
  * for all SWT widget classes should include a comment which
  * describes the style constants which are applicable to the class.
  * </p>
  *
  * @param parent a composite control which will be the parent of the new instance (cannot be null)
  * @param style the style of control to construct
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
  *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
  * </ul>
  *
  * @see SWT
  * @see Widget#checkSubclass
  * @see Widget#getStyle
  */
 public Group (Composite parent, int style) {
 	super (parent, checkStyle (style));
 }

 int callWindowProc (int msg, int wParam, int lParam) {
 	if (handle == 0) return 0;
 	return OS.CallWindowProc (GroupProc, handle, msg, wParam, lParam);
 }

 static int checkStyle (int style) {
 	style |= SWT.NO_FOCUS;
 	/*
 	* 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;
 	RECT rect = new RECT ();
 	int newFont, oldFont = 0;
 	int hDC = OS.GetDC (handle);
 	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
 	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
 	int length = OS.GetWindowTextLength (handle);
 	TCHAR buffer1 = new TCHAR (getCodePage (), length + 1);
 	OS.GetWindowText (handle, buffer1, length + 1);
 	int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE;
 	OS.DrawText (hDC, buffer1, length, rect, flags);
 	if (newFont != 0) OS.SelectObject (hDC, oldFont);
 	OS.ReleaseDC (handle, hDC);
 	Point size;
 	if (layout != null) {
 		size = layout.computeSize (this, wHint, hHint, changed);
 	} else {
 		size = minimumSize ();
 	}
 	width = size.x;  height = size.y;
 	if (width == 0) width = DEFAULT_WIDTH;
 	if (height == 0) height = DEFAULT_HEIGHT;
 	if (wHint != SWT.DEFAULT) width = wHint;
 	if (hHint != SWT.DEFAULT) height = hHint;
 	Rectangle trim = computeTrim (0, 0, width, height);
 	width = Math.max (trim.width, rect.right - rect.left + 6);
 	height = trim.height;
 	return new Point (width, height);
 }

 public Rectangle computeTrim (int x, int y, int width, int height) {
 	checkWidget ();
 	Rectangle trim = super.computeTrim (x, y, width, height);
 	int newFont, oldFont = 0;
 	int hDC = OS.GetDC (handle);
 	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
 	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
 	TEXTMETRIC tm = new TEXTMETRIC ();
 	OS.GetTextMetrics (hDC, tm);
 	if (newFont != 0) OS.SelectObject (hDC, oldFont);
 	OS.ReleaseDC (handle, hDC);
 	int inset = 3;
 	trim.x -= inset;  trim.y -= tm.tmHeight;
 	trim.width += (inset * 2);  trim.height += tm.tmHeight + inset;
 	return trim;
 }

 void createHandle () {
 	super.createHandle ();
 	state &= ~CANVAS;
 }

 public Rectangle getClientArea () {
 	checkWidget ();
 	if (parent.hdwp != 0) {
 		int oldHdwp = parent.hdwp;
 		parent.hdwp = 0;
 		OS.EndDeferWindowPos (oldHdwp);
 		int count = parent.getChildrenCount ();
 		parent.hdwp = OS.BeginDeferWindowPos (count);
 	}
 	RECT rect = new RECT ();
 	OS.GetClientRect (handle, rect);
 	int newFont, oldFont = 0;
 	int hDC = OS.GetDC (handle);
 	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
 	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
 	TEXTMETRIC tm = new TEXTMETRIC ();
 	OS.GetTextMetrics (hDC, tm);
 	if (newFont != 0) OS.SelectObject (hDC, oldFont);
 	OS.ReleaseDC (handle, hDC);
 	int inset = 3, x = inset, y = tm.tmHeight;
 	return new Rectangle (x, y, rect.right - (inset * 2), rect.bottom - y - inset);
 }

 String getNameText () {
 	return getText ();
 }

 /**
  * Returns the receiver's text, which is the string that the
  * is used as the <em>title</em>. If the text has not previously
  * been set, returns an empty string.
  *
  * @return the 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 ();
 	int length = OS.GetWindowTextLength (handle);
 	if (length == 0) return "";
 	TCHAR buffer = new TCHAR (getCodePage (), length + 1);
 	OS.GetWindowText (handle, buffer, length + 1);
 	return buffer.toString (0, length);
 }

 boolean mnemonicHit (char key) {
 	return setFocus ();
 }

 boolean mnemonicMatch (char key) {
 	char mnemonic = findMnemonic (getText ());
 	if (mnemonic == '\0') return false;
 	return Character.toUpperCase (key) == Character.toUpperCase (mnemonic);
 }

 /**
  * Sets the receiver's text, which is the string that will
  * be displayed as the receiver's <em>title</em>, to the argument,
  * which may not be null.
  *
  * @param text the new text
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  */
 public void setText (String string) {
 	checkWidget ();
 	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
 	TCHAR buffer = new TCHAR (getCodePage (), string, true);
 	OS.SetWindowText (handle, buffer);
 }

 int widgetStyle () {
 	/*
 	* Bug in Windows.  When GetDCEx () is called with DCX_INTERSECTUPDATE,
 	* the HDC that is returned does not include the current update region.
 	* This was confirmed under DEBUG Windows when GetDCEx () complained about
 	* invalid flags.  Therefore, it is not easily possible to get an HDC from
 	* outside of WM_PAINT that includes the current damage and clips children.
 	* Because the receiver has children and draws a frame and label, it is
 	* necessary that the receiver always draw clipped, in the current damaged
 	* area.  The fix is to force the receiver to be fully clipped by including
 	* WS_CLIPCHILDREN and WS_CLIPSIBLINGS in the default style bits.
 	*/
 	return super.widgetStyle () | OS.BS_GROUPBOX | OS.WS_CLIPCHILDREN | OS.WS_CLIPSIBLINGS;
 }

 TCHAR windowClass () {
 	return GroupClass;
 }

 int windowProc () {
 	return GroupProc;
 }

 LRESULT WM_LBUTTONDBLCLK (int wParam, int lParam) {
 	/*
 	* Feature in Windows.  When the user clicks on the group
 	* box label, the group box takes focus.  This is unwanted.
 	* The fix is to avoid calling the group box window proc.
 	*/
 	/*
 	* Bug in Windows.  For some reason, if we allow the group
 	* box to take focus, it will draw on top of pull down combo
 	* box children.  The fix is to avoid calling the window proc
 	* to disallow the receiver from getting focus.
 	*/
 	sendMouseEvent (SWT.MouseDown, 1, OS.WM_LBUTTONDOWN, wParam, lParam);
 	sendMouseEvent (SWT.MouseDoubleClick, 1, OS.WM_LBUTTONDBLCLK, wParam, lParam);
 	if (OS.GetCapture () != handle) OS.SetCapture (handle);
 	return LRESULT.ZERO;
 }

 LRESULT WM_LBUTTONDOWN (int wParam, int lParam) {
 	/*
 	* Feature in Windows.  When the user clicks on the group
 	* box label, the group box takes focus.  This is unwanted.
 	* The fix is to avoid calling the group box window proc.
 	*/
 	/*
 	* Bug in Windows.  For some reason, if we allow the group
 	* box to take focus, it will draw on top of pull down combo
 	* box children.  The fix is to avoid calling the window proc
 	* to disallow the receiver from getting focus.
 	*/
 	sendMouseEvent (SWT.MouseDown, 1, OS.WM_LBUTTONDOWN, wParam, lParam);
 	if (OS.GetCapture () != handle) OS.SetCapture (handle);
 	if (hooks (SWT.DragDetect)) {
 		POINT pt = new POINT ();
 		pt.x = (short) (lParam & 0xFFFF);
 		pt.y = (short) (lParam >> 16);
 		if (!OS.IsWinCE) {
 			/*
 			* The DragDetect function captures the mouse and tracks its movement until the user releases
 			* the left button, presses the ESC key, or moves the mouse outside the drag rectangle around
 			* the specified point.   If the user moves the mouse outside of the drag rectangle, DragDetect
 			* returns true.
 			*/
 			if (OS.DragDetect (handle, pt)) {
 				sendEvent (SWT.DragDetect);
 				// widget could be disposed at this point
 			} else {
 				/*
 				* The Mouse up event and the ESC key event have been consumed by DragDetect so
 				* detect the cases and send the events.
 				*/
 				if (OS.GetKeyState (OS.VK_ESCAPE) ==  0) {
 					sendMouseEvent (SWT.MouseUp, 1, OS.WM_LBUTTONUP, wParam, lParam);
 					// widget could be disposed at this point
 				}
 			}
 		}
 	}
 	return LRESULT.ZERO;
 }

 LRESULT WM_NCHITTEST (int wParam, int lParam) {
 	LRESULT result = super.WM_NCHITTEST (wParam, lParam);
 	if (result != null) return result;
 	/*
 	* Feature in Windows.  The window proc for the group box
 	* returns HTTRANSPARTENT indicating that mouse messages
 	* should not be delivered to the receiver and any children.
 	* Normally, group boxes in Windows do not have children and
 	* this is the correct behavior for this case.  Because we
 	* allow children, answer HTCLIENT to allow mouse messages
 	* to be delivered to the children.
 	*/
 	return new LRESULT (OS.HTCLIENT);
 }

 }
	package org.eclipse.swt.widgets;

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

	import org.eclipse.swt.internal.*;
	import org.eclipse.swt.internal.win32.*;
	import org.eclipse.swt.*;
	import org.eclipse.swt.graphics.*;

	/**
	* Instances of this class provide an etched border
	* with an optional title.
	* <p>
	* Shadow styles are hints and may not be honoured
	* by the platform. To create a group with the
	* default shadow style for the platform, do not
	* specify a shadow style.
	* <dl>
	* <dt><b>Styles:</b></dt>
	* <dd>SHADOW_ETCHED_IN, SHADOW_ETCHED_OUT, SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd>
	* <dt><b>Events:</b></dt>
	* <dd>(none)</dd>
	* </dl>
	* <p>
	* IMPORTANT: This class is <em>not</em> intended to be subclassed.
	* </p>
	*/

	public class Group extends Composite {
	static final int GroupProc;
	static final TCHAR GroupClass = new TCHAR (0, "BUTTON", true);
	static {
	WNDCLASS lpWndClass = new WNDCLASS ();
	OS.GetClassInfo (0, GroupClass, lpWndClass);
	GroupProc = lpWndClass.lpfnWndProc;
	}

	/**
	* Constructs a new instance of this class given its parent
	* and a style value describing its behavior and appearance.
	* <p>
	* The style value is either one of the style constants defined in
	* class <code>SWT</code> which is applicable to instances of this
	* class, or must be built by <em>bitwise OR</em>'ing together
	* (that is, using the <code>int</code> "\|" operator) two or more
	* of those <code>SWT</code> style constants. The class description
	* for all SWT widget classes should include a comment which
	* describes the style constants which are applicable to the class.
	* </p>
	*
	* @param parent a composite control which will be the parent of the new instance (cannot be null)
	* @param style the style of control to construct
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
	* </ul>
	* @exception SWTException <ul>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
	* <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
	* </ul>
	*
	* @see SWT
	* @see Widget#checkSubclass
	* @see Widget#getStyle
	*/
	public Group (Composite parent, int style) {
	super (parent, checkStyle (style));
	}

	int callWindowProc (int msg, int wParam, int lParam) {
	if (handle == 0) return 0;
	return OS.CallWindowProc (GroupProc, handle, msg, wParam, lParam);
	}

	static int checkStyle (int style) {
	style \|= SWT.NO_FOCUS;
	/*
	* 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;
	RECT rect = new RECT ();
	int newFont, oldFont = 0;
	int hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	int length = OS.GetWindowTextLength (handle);
	TCHAR buffer1 = new TCHAR (getCodePage (), length + 1);
	OS.GetWindowText (handle, buffer1, length + 1);
	int flags = OS.DT_CALCRECT \| OS.DT_SINGLELINE;
	OS.DrawText (hDC, buffer1, length, rect, flags);
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	Point size;
	if (layout != null) {
	size = layout.computeSize (this, wHint, hHint, changed);
	} else {
	size = minimumSize ();
	}
	width = size.x; height = size.y;
	if (width == 0) width = DEFAULT_WIDTH;
	if (height == 0) height = DEFAULT_HEIGHT;
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	Rectangle trim = computeTrim (0, 0, width, height);
	width = Math.max (trim.width, rect.right - rect.left + 6);
	height = trim.height;
	return new Point (width, height);
	}

	public Rectangle computeTrim (int x, int y, int width, int height) {
	checkWidget ();
	Rectangle trim = super.computeTrim (x, y, width, height);
	int newFont, oldFont = 0;
	int hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	TEXTMETRIC tm = new TEXTMETRIC ();
	OS.GetTextMetrics (hDC, tm);
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	int inset = 3;
	trim.x -= inset; trim.y -= tm.tmHeight;
	trim.width += (inset * 2); trim.height += tm.tmHeight + inset;
	return trim;
	}

	void createHandle () {
	super.createHandle ();
	state &= ~CANVAS;
	}

	public Rectangle getClientArea () {
	checkWidget ();
	if (parent.hdwp != 0) {
	int oldHdwp = parent.hdwp;
	parent.hdwp = 0;
	OS.EndDeferWindowPos (oldHdwp);
	int count = parent.getChildrenCount ();
	parent.hdwp = OS.BeginDeferWindowPos (count);
	}
	RECT rect = new RECT ();
	OS.GetClientRect (handle, rect);
	int newFont, oldFont = 0;
	int hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	TEXTMETRIC tm = new TEXTMETRIC ();
	OS.GetTextMetrics (hDC, tm);
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	int inset = 3, x = inset, y = tm.tmHeight;
	return new Rectangle (x, y, rect.right - (inset * 2), rect.bottom - y - inset);
	}

	String getNameText () {
	return getText ();
	}

	/**
	* Returns the receiver's text, which is the string that the
	* is used as the <em>title</em>. If the text has not previously
	* been set, returns an empty string.
	*
	* @return the 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 ();
	int length = OS.GetWindowTextLength (handle);
	if (length == 0) return "";
	TCHAR buffer = new TCHAR (getCodePage (), length + 1);
	OS.GetWindowText (handle, buffer, length + 1);
	return buffer.toString (0, length);
	}

	boolean mnemonicHit (char key) {
	return setFocus ();
	}

	boolean mnemonicMatch (char key) {
	char mnemonic = findMnemonic (getText ());
	if (mnemonic == '\0') return false;
	return Character.toUpperCase (key) == Character.toUpperCase (mnemonic);
	}

	/**
	* Sets the receiver's text, which is the string that will
	* be displayed as the receiver's <em>title</em>, to the argument,
	* which may not be null.
	*
	* @param text the new text
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	* </ul>
	* @exception SWTException <ul>
	* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	* </ul>
	*/
	public void setText (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	TCHAR buffer = new TCHAR (getCodePage (), string, true);
	OS.SetWindowText (handle, buffer);
	}

	int widgetStyle () {
	/*
	* Bug in Windows. When GetDCEx () is called with DCX_INTERSECTUPDATE,
	* the HDC that is returned does not include the current update region.
	* This was confirmed under DEBUG Windows when GetDCEx () complained about
	* invalid flags. Therefore, it is not easily possible to get an HDC from
	* outside of WM_PAINT that includes the current damage and clips children.
	* Because the receiver has children and draws a frame and label, it is
	* necessary that the receiver always draw clipped, in the current damaged
	* area. The fix is to force the receiver to be fully clipped by including
	* WS_CLIPCHILDREN and WS_CLIPSIBLINGS in the default style bits.
	*/
	return super.widgetStyle () \| OS.BS_GROUPBOX \| OS.WS_CLIPCHILDREN \| OS.WS_CLIPSIBLINGS;
	}

	TCHAR windowClass () {
	return GroupClass;
	}

	int windowProc () {
	return GroupProc;
	}

	LRESULT WM_LBUTTONDBLCLK (int wParam, int lParam) {
	/*
	* Feature in Windows. When the user clicks on the group
	* box label, the group box takes focus. This is unwanted.
	* The fix is to avoid calling the group box window proc.
	*/
	/*
	* Bug in Windows. For some reason, if we allow the group
	* box to take focus, it will draw on top of pull down combo
	* box children. The fix is to avoid calling the window proc
	* to disallow the receiver from getting focus.
	*/
	sendMouseEvent (SWT.MouseDown, 1, OS.WM_LBUTTONDOWN, wParam, lParam);
	sendMouseEvent (SWT.MouseDoubleClick, 1, OS.WM_LBUTTONDBLCLK, wParam, lParam);
	if (OS.GetCapture () != handle) OS.SetCapture (handle);
	return LRESULT.ZERO;
	}

	LRESULT WM_LBUTTONDOWN (int wParam, int lParam) {
	/*
	* Feature in Windows. When the user clicks on the group
	* box label, the group box takes focus. This is unwanted.
	* The fix is to avoid calling the group box window proc.
	*/
	/*
	* Bug in Windows. For some reason, if we allow the group
	* box to take focus, it will draw on top of pull down combo
	* box children. The fix is to avoid calling the window proc
	* to disallow the receiver from getting focus.
	*/
	sendMouseEvent (SWT.MouseDown, 1, OS.WM_LBUTTONDOWN, wParam, lParam);
	if (OS.GetCapture () != handle) OS.SetCapture (handle);
	if (hooks (SWT.DragDetect)) {
	POINT pt = new POINT ();
	pt.x = (short) (lParam & 0xFFFF);
	pt.y = (short) (lParam >> 16);
	if (!OS.IsWinCE) {
	/*
	* The DragDetect function captures the mouse and tracks its movement until the user releases
	* the left button, presses the ESC key, or moves the mouse outside the drag rectangle around
	* the specified point. If the user moves the mouse outside of the drag rectangle, DragDetect
	* returns true.
	*/
	if (OS.DragDetect (handle, pt)) {
	sendEvent (SWT.DragDetect);
	// widget could be disposed at this point
	} else {
	/*
	* The Mouse up event and the ESC key event have been consumed by DragDetect so
	* detect the cases and send the events.
	*/
	if (OS.GetKeyState (OS.VK_ESCAPE) == 0) {
	sendMouseEvent (SWT.MouseUp, 1, OS.WM_LBUTTONUP, wParam, lParam);
	// widget could be disposed at this point
	}
	}
	}
	}
	return LRESULT.ZERO;
	}

	LRESULT WM_NCHITTEST (int wParam, int lParam) {
	LRESULT result = super.WM_NCHITTEST (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows. The window proc for the group box
	* returns HTTRANSPARTENT indicating that mouse messages
	* should not be delivered to the receiver and any children.
	* Normally, group boxes in Windows do not have children and
	* this is the correct behavior for this case. Because we
	* allow children, answer HTCLIENT to allow mouse messages
	* to be delivered to the children.
	*/
	return new LRESULT (OS.HTCLIENT);
	}

	}