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

 /*******************************************************************************
  * Copyright (c) 2000, 2010 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.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>
  * Note: Only one of the above styles 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/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 Group extends Composite {
 	String text = "";
 	static final int CLIENT_INSET = 3;
 	static final long /*int*/ GroupProc;
 	static final TCHAR GroupClass = new TCHAR (0, OS.IsWinCE ? "BUTTON" : "SWT_GROUP", true);
 	static {
 		/*
 		* Feature in Windows.  The group box window class
 		* uses the CS_HREDRAW and CS_VREDRAW style bits to
 		* force a full redraw of the control and all children
 		* when resized.  This causes flashing.  The fix is to
 		* register a new window class without these bits and
 		* implement special code that damages only the control.
 		*
 		* Feature in WinCE.  On certain devices, defining
 		* a new window class which looks like BUTTON causes
 		* CreateWindowEx() to crash.  The workaround is to use
 		* the class Button directly.
 		*/
 		WNDCLASS lpWndClass = new WNDCLASS ();
 		if (OS.IsWinCE) {
 			OS.GetClassInfo (0, GroupClass, lpWndClass);
 			GroupProc = lpWndClass.lpfnWndProc;
 		} else {
 			TCHAR WC_BUTTON = new TCHAR (0, "BUTTON", true);
 			OS.GetClassInfo (0, WC_BUTTON, lpWndClass);
 			GroupProc = lpWndClass.lpfnWndProc;
 			long /*int*/ hInstance = OS.GetModuleHandle (null);
 			if (!OS.GetClassInfo (hInstance, GroupClass, lpWndClass)) {
 				long /*int*/ hHeap = OS.GetProcessHeap ();
 				lpWndClass.hInstance = hInstance;
 				lpWndClass.style &= ~(OS.CS_HREDRAW | OS.CS_VREDRAW);
 				int byteCount = GroupClass.length () * TCHAR.sizeof;
 				long /*int*/ lpszClassName = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
 				OS.MoveMemory (lpszClassName, GroupClass, byteCount);
 				lpWndClass.lpszClassName = lpszClassName;
 				OS.RegisterClass (lpWndClass);
 				OS.HeapFree (hHeap, 0, lpszClassName);
 			}
 		}
 	}

 /**
  * 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#SHADOW_ETCHED_IN
  * @see SWT#SHADOW_ETCHED_OUT
  * @see SWT#SHADOW_IN
  * @see SWT#SHADOW_OUT
  * @see SWT#SHADOW_NONE
  * @see Widget#checkSubclass
  * @see Widget#getStyle
  */
 public Group (Composite parent, int style) {
 	super (parent, checkStyle (style));
 }

 long /*int*/ callWindowProc (long /*int*/ hwnd, int msg, long /*int*/ wParam, long /*int*/ lParam) {
 	if (handle == 0) return 0;
 	/*
 	* 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.
 	*/
 	switch (msg) {
 		case OS.WM_LBUTTONDOWN:
 		case OS.WM_LBUTTONDBLCLK:
 			return OS.DefWindowProc (hwnd, msg, wParam, lParam);
 	}
 	return OS.CallWindowProc (GroupProc, hwnd, 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 ();
 	Point size = super.computeSize (wHint, hHint, changed);
 	int length = text.length ();
 	if (length != 0) {
 		String string = fixText (false);

 		/*
 		* If the group has text, and the text is wider than the
 		* client area, pad the width so the text is not clipped.
 		*/
 		TCHAR buffer = new TCHAR (getCodePage (), string == null ? text : string, true);
 		long /*int*/ newFont, oldFont = 0;
 		long /*int*/ hDC = OS.GetDC (handle);
 		newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
 		if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
 		RECT rect = new RECT ();
 		int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE;
 		OS.DrawText (hDC, buffer, -1, rect, flags);
 		if (newFont != 0) OS.SelectObject (hDC, oldFont);
 		OS.ReleaseDC (handle, hDC);
 		int offsetY = OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed () ? 0 : 1;
 		size.x = Math.max (size.x, rect.right - rect.left + CLIENT_INSET * 6 + offsetY);
 	}
 	return size;
 }

 public Rectangle computeTrim (int x, int y, int width, int height) {
 	checkWidget ();
 	Rectangle trim = super.computeTrim (x, y, width, height);
 	long /*int*/ newFont, oldFont = 0;
 	long /*int*/ hDC = OS.GetDC (handle);
 	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
 	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
 	TEXTMETRIC tm = OS.IsUnicode ? (TEXTMETRIC) new TEXTMETRICW () : new TEXTMETRICA ();
 	OS.GetTextMetrics (hDC, tm);
 	if (newFont != 0) OS.SelectObject (hDC, oldFont);
 	OS.ReleaseDC (handle, hDC);
 	int offsetY = OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed () ? 0 : 1;
 	trim.x -= CLIENT_INSET;
 	trim.y -= tm.tmHeight + offsetY;
 	trim.width += CLIENT_INSET * 2;
 	trim.height += tm.tmHeight + CLIENT_INSET + offsetY;
 	return trim;
 }

 void createHandle () {
 	/*
 	* Feature in Windows.  When a button is created,
 	* it clears the UI state for all controls in the
 	* shell by sending WM_CHANGEUISTATE with UIS_SET,
 	* UISF_HIDEACCEL and UISF_HIDEFOCUS to the parent.
 	* This is undocumented and unexpected.  The fix
 	* is to ignore the WM_CHANGEUISTATE, when sent
 	* from CreateWindowEx().
 	*/
 	parent.state |= IGNORE_WM_CHANGEUISTATE;
 	super.createHandle ();
 	parent.state &= ~IGNORE_WM_CHANGEUISTATE;
 	state |= DRAW_BACKGROUND;
 	state &= ~CANVAS;
 }

 void enableWidget (boolean enabled) {
 	super.enableWidget (enabled);
 	/*
 	* Bug in Windows.  When a group control is right-to-left and
 	* is disabled, the first pixel of the text is clipped.  The
 	* fix is to add a space to both sides of the text.
 	*/
 	String string = fixText (enabled);
 	if (string != null) {
 		TCHAR buffer = new TCHAR (getCodePage (), string, true);
 		OS.SetWindowText (handle, buffer);
 	}
 }

 String fixText (boolean enabled) {
 	/*
 	* Bug in Windows.  When a group control is right-to-left and
 	* is disabled, the first pixel of the text is clipped.  The
 	* fix is to add a space to both sides of the text.
 	*/
 	if (text.length() == 0) return null;
 	if ((style & SWT.RIGHT_TO_LEFT) != 0) {
 		String string = null;
 		if (!enabled && (OS.COMCTL32_MAJOR < 6 || !OS.IsAppThemed ())) {
 			string = " " + text + " ";
 		}
 		return (style & SWT.FLIP_TEXT_DIRECTION) == 0 ? string : string != null ? LRE + string : LRE + text;
 	} else if ((style & SWT.FLIP_TEXT_DIRECTION) != 0) {
 		return RLE + text;
 	}
 	return null;
 }

 public Rectangle getClientArea () {
 	checkWidget ();
 	forceResize ();
 	RECT rect = new RECT ();
 	OS.GetClientRect (handle, rect);
 	long /*int*/ newFont, oldFont = 0;
 	long /*int*/ hDC = OS.GetDC (handle);
 	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
 	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
 	TEXTMETRIC tm = OS.IsUnicode ? (TEXTMETRIC) new TEXTMETRICW () : new TEXTMETRICA ();
 	OS.GetTextMetrics (hDC, tm);
 	if (newFont != 0) OS.SelectObject (hDC, oldFont);
 	OS.ReleaseDC (handle, hDC);
 	int offsetY = OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed () ? 0 : 1;
 	int x = CLIENT_INSET, y = tm.tmHeight + offsetY;
 	int width = Math.max (0, rect.right - CLIENT_INSET * 2);
 	int height = Math.max (0, rect.bottom - y - CLIENT_INSET);
 	return new Rectangle (x, y, width, height);
 }

 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 ();
 	return text;
 }

 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);
 }

 void printWidget (long /*int*/ hwnd, long /*int*/ hdc, GC gc) {
 	/*
 	* Bug in Windows.  For some reason, PrintWindow()
 	* returns success but does nothing when it is called
 	* on a printer.  The fix is to just go directly to
 	* WM_PRINT in this case.
 	*/
 	boolean success = false;
 	if (!(OS.GetDeviceCaps(gc.handle, OS.TECHNOLOGY) == OS.DT_RASPRINTER)) {
 		int bits = OS.GetWindowLong (hwnd, OS.GWL_STYLE);
 		if ((bits & OS.WS_VISIBLE) == 0) {
 			OS.ShowWindow (hwnd, OS.SW_SHOW);
 		}
 		success = OS.PrintWindow (hwnd, hdc, 0);
 		if ((bits & OS.WS_VISIBLE) == 0) {
 			OS.ShowWindow (hwnd, OS.SW_HIDE);
 		}
 	}

 	/*
 	* Bug in Windows.  For some reason, PrintWindow() fails
 	* when it is called on a push button.  The fix is to
 	* detect the failure and use WM_PRINT instead.  Note
 	* that WM_PRINT cannot be used all the time because it
 	* fails for browser controls when the browser has focus.
 	*/
 	if (!success) {
 		/*
 		* Bug in Windows.  For some reason, WM_PRINT when called
 		* with PRF_CHILDREN will not draw the tool bar divider
 		* for tool bar children that do not have CCS_NODIVIDER.
 		* The fix is to draw the group box and iterate through
 		* the children, drawing each one.
 		*/
 		int flags = OS.PRF_CLIENT | OS.PRF_NONCLIENT | OS.PRF_ERASEBKGND;
 		OS.SendMessage (hwnd, OS.WM_PRINT, hdc, flags);
 		int nSavedDC = OS.SaveDC (hdc);
 		Control [] children = _getChildren ();
 		Rectangle rect = getBounds ();
 		OS.IntersectClipRect (hdc, 0, 0, rect.width, rect.height);
 		for (int i=children.length - 1; i>=0; --i) {
 			Point location = children [i].getLocation ();
 			int graphicsMode = OS.GetGraphicsMode(hdc);
 			if (graphicsMode == OS.GM_ADVANCED) {
 				float [] lpXform = {1, 0, 0, 1, location.x, location.y};
 				OS.ModifyWorldTransform(hdc, lpXform, OS.MWT_LEFTMULTIPLY);
 			} else {
 				OS.SetWindowOrgEx (hdc, -location.x, -location.y, null);
 			}
 			long /*int*/ topHandle = children [i].topHandle();
 			int bits = OS.GetWindowLong (topHandle, OS.GWL_STYLE);
 			if ((bits & OS.WS_VISIBLE) != 0) {
 				children [i].printWidget (topHandle, hdc, gc);
 			}
 			if (graphicsMode == OS.GM_ADVANCED) {
 				float [] lpXform = {1, 0, 0, 1, -location.x, -location.y};
 				OS.ModifyWorldTransform(hdc, lpXform, OS.MWT_LEFTMULTIPLY);
 			}
 		}
 		OS.RestoreDC (hdc, nSavedDC);
 	}
 }

 void releaseWidget () {
 	super.releaseWidget ();
 	text = null;
 }

 public void setFont (Font font) {
 	checkWidget ();
 	Rectangle oldRect = getClientArea ();
 	super.setFont (font);
 	Rectangle newRect = getClientArea ();
 	if (!oldRect.equals (newRect)) sendResize ();
 }

 /**
  * 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. The string may include the mnemonic character.
  * </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 first child of the group. 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);
 	text = string;
 	string = fixText (OS.IsWindowEnabled (handle));
 	TCHAR buffer = new TCHAR (getCodePage (), string == null ? text : string, true);
 	OS.SetWindowText (handle, buffer);
 }

 boolean updateTextDirection(int textDirection) {
 	if (super.updateTextDirection(textDirection)) {
 		String string = fixText (OS.IsWindowEnabled (handle));
 		if (string != null) {
 			TCHAR buffer = new TCHAR (getCodePage (), string, true);
 			OS.SetWindowText (handle, buffer);
 		}
 		return true;
 	}
 	return false;
 }

 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;
 }

 long /*int*/ windowProc () {
 	return GroupProc;
 }

 LRESULT WM_ERASEBKGND (long /*int*/ wParam, long /*int*/ lParam) {
 	LRESULT result = super.WM_ERASEBKGND (wParam, lParam);
 	if (result != null) return result;
 	/*
 	* Feature in Windows.  Group boxes do not erase
 	* the background before drawing.  The fix is to
 	* fill the background.
 	*/
 	drawBackground (wParam);
 	return LRESULT.ONE;
 }

 LRESULT WM_NCHITTEST (long /*int*/ wParam, long /*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 HTTRANSPARENT 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.
 	*/
 	long /*int*/ code = callWindowProc (handle, OS.WM_NCHITTEST, wParam, lParam);
 	if (code == OS.HTTRANSPARENT) code = OS.HTCLIENT;
 	return new LRESULT (code);
 }

 LRESULT WM_MOUSEMOVE (long /*int*/ wParam, long /*int*/ lParam) {
 	LRESULT result = super.WM_MOUSEMOVE (wParam, lParam);
 	if (result != null) return result;
 	/*
 	* Feature in Windows.  In version 6.00 of COMCTL32.DLL,
 	* every time the mouse moves, the group title redraws.
 	* This only happens when WM_NCHITTEST returns HTCLIENT.
 	* The fix is to avoid calling the group window proc.
 	*/
 	return LRESULT.ZERO;
 }

 LRESULT WM_PRINTCLIENT (long /*int*/ wParam, long /*int*/ lParam) {
 	LRESULT result = super.WM_PRINTCLIENT (wParam, lParam);
 	if (result != null) return result;
 	/*
 	* Feature in Windows.  In version 6.00 of COMCTL32.DLL,
 	* when WM_PRINTCLIENT is sent from a child BS_GROUP
 	* control to a parent BS_GROUP, the parent BS_GROUP
 	* clears the font from the HDC.  Normally, group boxes
 	* in Windows do not have children so this behavior is
 	* undefined.  When the parent of a BS_GROUP is not a
 	* BS_GROUP, there is no problem.  The fix is to save
 	* and restore the current font.
 	*/
 	if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
 		int nSavedDC = OS.SaveDC (wParam);
 		long /*int*/ code = callWindowProc (handle, OS.WM_PRINTCLIENT, wParam, lParam);
 		OS.RestoreDC (wParam, nSavedDC);
 		return new LRESULT (code);
 	}
 	return result;
 }

 LRESULT WM_UPDATEUISTATE (long /*int*/ wParam, long /*int*/ lParam) {
 	LRESULT result = super.WM_UPDATEUISTATE (wParam, lParam);
 	if (result != null) return result;
 	/*
 	* Feature in Windows.  When WM_UPDATEUISTATE is sent to
 	* a group, it sends WM_CTLCOLORBTN to get the foreground
 	* and background.  If drawing happens in WM_CTLCOLORBTN,
 	* it will overwrite the contents of the control.  The
 	* fix is draw the group without drawing the background
 	* and avoid the group window proc.
 	*/
 	boolean redraw = findImageControl () != null;
 	if (!redraw) {
 		if ((state & THEME_BACKGROUND) != 0) {
 			if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
 				redraw = findThemeControl () != null;
 			}
 		}
 		if (!redraw) redraw = findBackgroundControl () != null;
 	}
 	if (redraw) {
 		OS.InvalidateRect (handle, null, false);
 		long /*int*/ code = OS.DefWindowProc (handle, OS.WM_UPDATEUISTATE, wParam, lParam);
 		return new LRESULT (code);
 	}
 	return result;
 }

 LRESULT WM_WINDOWPOSCHANGING (long /*int*/ wParam, long /*int*/ lParam) {
 	LRESULT result = super.WM_WINDOWPOSCHANGING (wParam, lParam);
 	if (result != null) return result;
 	/*
 	* Invalidate the portion of the group widget that needs to
 	* be redrawn.  Note that for some reason, invalidating the
 	* group from inside WM_SIZE causes pixel corruption for
 	* radio button children.
 	*/
 	if (OS.IsWinCE) return result;
 	if (!OS.IsWindowVisible (handle)) return result;
 	WINDOWPOS lpwp = new WINDOWPOS ();
 	OS.MoveMemory (lpwp, lParam, WINDOWPOS.sizeof);
 	if ((lpwp.flags & (OS.SWP_NOSIZE | OS.SWP_NOREDRAW)) != 0) {
 		return result;
 	}
 	RECT rect = new RECT ();
 	OS.SetRect (rect, 0, 0, lpwp.cx, lpwp.cy);
 	OS.SendMessage (handle, OS.WM_NCCALCSIZE, 0, rect);
 	int newWidth = rect.right - rect.left;
 	int newHeight = rect.bottom - rect.top;
 	OS.GetClientRect (handle, rect);
 	int oldWidth = rect.right - rect.left;
 	int oldHeight = rect.bottom - rect.top;
 	if (newWidth == oldWidth && newHeight == oldHeight) {
 		return result;
 	}
 	if (newWidth != oldWidth) {
 		int left = oldWidth;
 		if (newWidth < oldWidth) left = newWidth;
 		OS.SetRect (rect, left - CLIENT_INSET, 0, newWidth, newHeight);
 		OS.InvalidateRect (handle, rect, true);
 	}
 	if (newHeight != oldHeight) {
 		int bottom = oldHeight;
 		if (newHeight < oldHeight) bottom = newHeight;
 		if (newWidth < oldWidth) oldWidth -= CLIENT_INSET;
 		OS.SetRect (rect, 0, bottom - CLIENT_INSET, oldWidth, newHeight);
 		OS.InvalidateRect (handle, rect, true);
 	}
 	return result;
 }
 }
	/*******************************************************************************
	* Copyright (c) 2000, 2010 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.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>
	* Note: Only one of the above styles 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/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 Group extends Composite {
	String text = "";
	static final int CLIENT_INSET = 3;
	static final long /int/ GroupProc;
	static final TCHAR GroupClass = new TCHAR (0, OS.IsWinCE ? "BUTTON" : "SWT_GROUP", true);
	static {
	/*
	* Feature in Windows. The group box window class
	* uses the CS_HREDRAW and CS_VREDRAW style bits to
	* force a full redraw of the control and all children
	* when resized. This causes flashing. The fix is to
	* register a new window class without these bits and
	* implement special code that damages only the control.
	*
	* Feature in WinCE. On certain devices, defining
	* a new window class which looks like BUTTON causes
	* CreateWindowEx() to crash. The workaround is to use
	* the class Button directly.
	*/
	WNDCLASS lpWndClass = new WNDCLASS ();
	if (OS.IsWinCE) {
	OS.GetClassInfo (0, GroupClass, lpWndClass);
	GroupProc = lpWndClass.lpfnWndProc;
	} else {
	TCHAR WC_BUTTON = new TCHAR (0, "BUTTON", true);
	OS.GetClassInfo (0, WC_BUTTON, lpWndClass);
	GroupProc = lpWndClass.lpfnWndProc;
	long /int/ hInstance = OS.GetModuleHandle (null);
	if (!OS.GetClassInfo (hInstance, GroupClass, lpWndClass)) {
	long /int/ hHeap = OS.GetProcessHeap ();
	lpWndClass.hInstance = hInstance;
	lpWndClass.style &= ~(OS.CS_HREDRAW \| OS.CS_VREDRAW);
	int byteCount = GroupClass.length () * TCHAR.sizeof;
	long /int/ lpszClassName = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
	OS.MoveMemory (lpszClassName, GroupClass, byteCount);
	lpWndClass.lpszClassName = lpszClassName;
	OS.RegisterClass (lpWndClass);
	OS.HeapFree (hHeap, 0, lpszClassName);
	}
	}
	}

	/**
	* 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#SHADOW_ETCHED_IN
	* @see SWT#SHADOW_ETCHED_OUT
	* @see SWT#SHADOW_IN
	* @see SWT#SHADOW_OUT
	* @see SWT#SHADOW_NONE
	* @see Widget#checkSubclass
	* @see Widget#getStyle
	*/
	public Group (Composite parent, int style) {
	super (parent, checkStyle (style));
	}

	long /int/ callWindowProc (long /int/ hwnd, int msg, long /int/ wParam, long /int/ lParam) {
	if (handle == 0) return 0;
	/*
	* 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.
	*/
	switch (msg) {
	case OS.WM_LBUTTONDOWN:
	case OS.WM_LBUTTONDBLCLK:
	return OS.DefWindowProc (hwnd, msg, wParam, lParam);
	}
	return OS.CallWindowProc (GroupProc, hwnd, 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 ();
	Point size = super.computeSize (wHint, hHint, changed);
	int length = text.length ();
	if (length != 0) {
	String string = fixText (false);

	/*
	* If the group has text, and the text is wider than the
	* client area, pad the width so the text is not clipped.
	*/
	TCHAR buffer = new TCHAR (getCodePage (), string == null ? text : string, true);
	long /int/ newFont, oldFont = 0;
	long /int/ hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	RECT rect = new RECT ();
	int flags = OS.DT_CALCRECT \| OS.DT_SINGLELINE;
	OS.DrawText (hDC, buffer, -1, rect, flags);
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	int offsetY = OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed () ? 0 : 1;
	size.x = Math.max (size.x, rect.right - rect.left + CLIENT_INSET * 6 + offsetY);
	}
	return size;
	}

	public Rectangle computeTrim (int x, int y, int width, int height) {
	checkWidget ();
	Rectangle trim = super.computeTrim (x, y, width, height);
	long /int/ newFont, oldFont = 0;
	long /int/ hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	TEXTMETRIC tm = OS.IsUnicode ? (TEXTMETRIC) new TEXTMETRICW () : new TEXTMETRICA ();
	OS.GetTextMetrics (hDC, tm);
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	int offsetY = OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed () ? 0 : 1;
	trim.x -= CLIENT_INSET;
	trim.y -= tm.tmHeight + offsetY;
	trim.width += CLIENT_INSET * 2;
	trim.height += tm.tmHeight + CLIENT_INSET + offsetY;
	return trim;
	}

	void createHandle () {
	/*
	* Feature in Windows. When a button is created,
	* it clears the UI state for all controls in the
	* shell by sending WM_CHANGEUISTATE with UIS_SET,
	* UISF_HIDEACCEL and UISF_HIDEFOCUS to the parent.
	* This is undocumented and unexpected. The fix
	* is to ignore the WM_CHANGEUISTATE, when sent
	* from CreateWindowEx().
	*/
	parent.state \|= IGNORE_WM_CHANGEUISTATE;
	super.createHandle ();
	parent.state &= ~IGNORE_WM_CHANGEUISTATE;
	state \|= DRAW_BACKGROUND;
	state &= ~CANVAS;
	}

	void enableWidget (boolean enabled) {
	super.enableWidget (enabled);
	/*
	* Bug in Windows. When a group control is right-to-left and
	* is disabled, the first pixel of the text is clipped. The
	* fix is to add a space to both sides of the text.
	*/
	String string = fixText (enabled);
	if (string != null) {
	TCHAR buffer = new TCHAR (getCodePage (), string, true);
	OS.SetWindowText (handle, buffer);
	}
	}

	String fixText (boolean enabled) {
	/*
	* Bug in Windows. When a group control is right-to-left and
	* is disabled, the first pixel of the text is clipped. The
	* fix is to add a space to both sides of the text.
	*/
	if (text.length() == 0) return null;
	if ((style & SWT.RIGHT_TO_LEFT) != 0) {
	String string = null;
	if (!enabled && (OS.COMCTL32_MAJOR < 6 \|\| !OS.IsAppThemed ())) {
	string = " " + text + " ";
	}
	return (style & SWT.FLIP_TEXT_DIRECTION) == 0 ? string : string != null ? LRE + string : LRE + text;
	} else if ((style & SWT.FLIP_TEXT_DIRECTION) != 0) {
	return RLE + text;
	}
	return null;
	}

	public Rectangle getClientArea () {
	checkWidget ();
	forceResize ();
	RECT rect = new RECT ();
	OS.GetClientRect (handle, rect);
	long /int/ newFont, oldFont = 0;
	long /int/ hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	TEXTMETRIC tm = OS.IsUnicode ? (TEXTMETRIC) new TEXTMETRICW () : new TEXTMETRICA ();
	OS.GetTextMetrics (hDC, tm);
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	int offsetY = OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed () ? 0 : 1;
	int x = CLIENT_INSET, y = tm.tmHeight + offsetY;
	int width = Math.max (0, rect.right - CLIENT_INSET * 2);
	int height = Math.max (0, rect.bottom - y - CLIENT_INSET);
	return new Rectangle (x, y, width, height);
	}

	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 ();
	return text;
	}

	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);
	}

	void printWidget (long /int/ hwnd, long /int/ hdc, GC gc) {
	/*
	* Bug in Windows. For some reason, PrintWindow()
	* returns success but does nothing when it is called
	* on a printer. The fix is to just go directly to
	* WM_PRINT in this case.
	*/
	boolean success = false;
	if (!(OS.GetDeviceCaps(gc.handle, OS.TECHNOLOGY) == OS.DT_RASPRINTER)) {
	int bits = OS.GetWindowLong (hwnd, OS.GWL_STYLE);
	if ((bits & OS.WS_VISIBLE) == 0) {
	OS.ShowWindow (hwnd, OS.SW_SHOW);
	}
	success = OS.PrintWindow (hwnd, hdc, 0);
	if ((bits & OS.WS_VISIBLE) == 0) {
	OS.ShowWindow (hwnd, OS.SW_HIDE);
	}
	}

	/*
	* Bug in Windows. For some reason, PrintWindow() fails
	* when it is called on a push button. The fix is to
	* detect the failure and use WM_PRINT instead. Note
	* that WM_PRINT cannot be used all the time because it
	* fails for browser controls when the browser has focus.
	*/
	if (!success) {
	/*
	* Bug in Windows. For some reason, WM_PRINT when called
	* with PRF_CHILDREN will not draw the tool bar divider
	* for tool bar children that do not have CCS_NODIVIDER.
	* The fix is to draw the group box and iterate through
	* the children, drawing each one.
	*/
	int flags = OS.PRF_CLIENT \| OS.PRF_NONCLIENT \| OS.PRF_ERASEBKGND;
	OS.SendMessage (hwnd, OS.WM_PRINT, hdc, flags);
	int nSavedDC = OS.SaveDC (hdc);
	Control [] children = _getChildren ();
	Rectangle rect = getBounds ();
	OS.IntersectClipRect (hdc, 0, 0, rect.width, rect.height);
	for (int i=children.length - 1; i>=0; --i) {
	Point location = children [i].getLocation ();
	int graphicsMode = OS.GetGraphicsMode(hdc);
	if (graphicsMode == OS.GM_ADVANCED) {
	float [] lpXform = {1, 0, 0, 1, location.x, location.y};
	OS.ModifyWorldTransform(hdc, lpXform, OS.MWT_LEFTMULTIPLY);
	} else {
	OS.SetWindowOrgEx (hdc, -location.x, -location.y, null);
	}
	long /int/ topHandle = children [i].topHandle();
	int bits = OS.GetWindowLong (topHandle, OS.GWL_STYLE);
	if ((bits & OS.WS_VISIBLE) != 0) {
	children [i].printWidget (topHandle, hdc, gc);
	}
	if (graphicsMode == OS.GM_ADVANCED) {
	float [] lpXform = {1, 0, 0, 1, -location.x, -location.y};
	OS.ModifyWorldTransform(hdc, lpXform, OS.MWT_LEFTMULTIPLY);
	}
	}
	OS.RestoreDC (hdc, nSavedDC);
	}
	}

	void releaseWidget () {
	super.releaseWidget ();
	text = null;
	}

	public void setFont (Font font) {
	checkWidget ();
	Rectangle oldRect = getClientArea ();
	super.setFont (font);
	Rectangle newRect = getClientArea ();
	if (!oldRect.equals (newRect)) sendResize ();
	}

	/**
	* 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. The string may include the mnemonic character.
	* </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 first child of the group. 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);
	text = string;
	string = fixText (OS.IsWindowEnabled (handle));
	TCHAR buffer = new TCHAR (getCodePage (), string == null ? text : string, true);
	OS.SetWindowText (handle, buffer);
	}

	boolean updateTextDirection(int textDirection) {
	if (super.updateTextDirection(textDirection)) {
	String string = fixText (OS.IsWindowEnabled (handle));
	if (string != null) {
	TCHAR buffer = new TCHAR (getCodePage (), string, true);
	OS.SetWindowText (handle, buffer);
	}
	return true;
	}
	return false;
	}

	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;
	}

	long /int/ windowProc () {
	return GroupProc;
	}

	LRESULT WM_ERASEBKGND (long /int/ wParam, long /int/ lParam) {
	LRESULT result = super.WM_ERASEBKGND (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows. Group boxes do not erase
	* the background before drawing. The fix is to
	* fill the background.
	*/
	drawBackground (wParam);
	return LRESULT.ONE;
	}

	LRESULT WM_NCHITTEST (long /int/ wParam, long /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 HTTRANSPARENT 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.
	*/
	long /int/ code = callWindowProc (handle, OS.WM_NCHITTEST, wParam, lParam);
	if (code == OS.HTTRANSPARENT) code = OS.HTCLIENT;
	return new LRESULT (code);
	}

	LRESULT WM_MOUSEMOVE (long /int/ wParam, long /int/ lParam) {
	LRESULT result = super.WM_MOUSEMOVE (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows. In version 6.00 of COMCTL32.DLL,
	* every time the mouse moves, the group title redraws.
	* This only happens when WM_NCHITTEST returns HTCLIENT.
	* The fix is to avoid calling the group window proc.
	*/
	return LRESULT.ZERO;
	}

	LRESULT WM_PRINTCLIENT (long /int/ wParam, long /int/ lParam) {
	LRESULT result = super.WM_PRINTCLIENT (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows. In version 6.00 of COMCTL32.DLL,
	* when WM_PRINTCLIENT is sent from a child BS_GROUP
	* control to a parent BS_GROUP, the parent BS_GROUP
	* clears the font from the HDC. Normally, group boxes
	* in Windows do not have children so this behavior is
	* undefined. When the parent of a BS_GROUP is not a
	* BS_GROUP, there is no problem. The fix is to save
	* and restore the current font.
	*/
	if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
	int nSavedDC = OS.SaveDC (wParam);
	long /int/ code = callWindowProc (handle, OS.WM_PRINTCLIENT, wParam, lParam);
	OS.RestoreDC (wParam, nSavedDC);
	return new LRESULT (code);
	}
	return result;
	}

	LRESULT WM_UPDATEUISTATE (long /int/ wParam, long /int/ lParam) {
	LRESULT result = super.WM_UPDATEUISTATE (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows. When WM_UPDATEUISTATE is sent to
	* a group, it sends WM_CTLCOLORBTN to get the foreground
	* and background. If drawing happens in WM_CTLCOLORBTN,
	* it will overwrite the contents of the control. The
	* fix is draw the group without drawing the background
	* and avoid the group window proc.
	*/
	boolean redraw = findImageControl () != null;
	if (!redraw) {
	if ((state & THEME_BACKGROUND) != 0) {
	if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
	redraw = findThemeControl () != null;
	}
	}
	if (!redraw) redraw = findBackgroundControl () != null;
	}
	if (redraw) {
	OS.InvalidateRect (handle, null, false);
	long /int/ code = OS.DefWindowProc (handle, OS.WM_UPDATEUISTATE, wParam, lParam);
	return new LRESULT (code);
	}
	return result;
	}

	LRESULT WM_WINDOWPOSCHANGING (long /int/ wParam, long /int/ lParam) {
	LRESULT result = super.WM_WINDOWPOSCHANGING (wParam, lParam);
	if (result != null) return result;
	/*
	* Invalidate the portion of the group widget that needs to
	* be redrawn. Note that for some reason, invalidating the
	* group from inside WM_SIZE causes pixel corruption for
	* radio button children.
	*/
	if (OS.IsWinCE) return result;
	if (!OS.IsWindowVisible (handle)) return result;
	WINDOWPOS lpwp = new WINDOWPOS ();
	OS.MoveMemory (lpwp, lParam, WINDOWPOS.sizeof);
	if ((lpwp.flags & (OS.SWP_NOSIZE \| OS.SWP_NOREDRAW)) != 0) {
	return result;
	}
	RECT rect = new RECT ();
	OS.SetRect (rect, 0, 0, lpwp.cx, lpwp.cy);
	OS.SendMessage (handle, OS.WM_NCCALCSIZE, 0, rect);
	int newWidth = rect.right - rect.left;
	int newHeight = rect.bottom - rect.top;
	OS.GetClientRect (handle, rect);
	int oldWidth = rect.right - rect.left;
	int oldHeight = rect.bottom - rect.top;
	if (newWidth == oldWidth && newHeight == oldHeight) {
	return result;
	}
	if (newWidth != oldWidth) {
	int left = oldWidth;
	if (newWidth < oldWidth) left = newWidth;
	OS.SetRect (rect, left - CLIENT_INSET, 0, newWidth, newHeight);
	OS.InvalidateRect (handle, rect, true);
	}
	if (newHeight != oldHeight) {
	int bottom = oldHeight;
	if (newHeight < oldHeight) bottom = newHeight;
	if (newWidth < oldWidth) oldWidth -= CLIENT_INSET;
	OS.SetRect (rect, 0, bottom - CLIENT_INSET, oldWidth, newHeight);
	OS.InvalidateRect (handle, rect, true);
	}
	return result;
	}
	}