bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Button.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.*;
 import org.eclipse.swt.events.*;

 /**
  * Instances of this class represent a selectable user interface object that
  * issues notification when pressed and released.
  * <dl>
  * <dt><b>Styles:</b></dt>
  * <dd>ARROW, CHECK, PUSH, RADIO, TOGGLE, FLAT</dd>
  * <dd>LEFT, RIGHT, CENTER</dd>
  * <dt><b>Events:</b></dt>
  * <dd>Selection</dd>
  * </dl>
  * <p>
  * IMPORTANT: This class is intended to be subclassed <em>only</em>
  * within the SWT implementation.
  * </p>
  */

 public class Button extends Control {
 	Image image;
 	static final int ButtonProc;
 	static final byte [] ButtonClass = Converter.wcsToMbcs (0,"BUTTON\0");
 	static final int CheckWidth, CheckHeight;
 	static {
 		int hBitmap = OS.LoadBitmap (0, OS.OBM_CHECKBOXES);
 		if (hBitmap == 0) {
 			CheckWidth = OS.GetSystemMetrics (OS.SM_CXVSCROLL);
 			CheckHeight = OS.GetSystemMetrics (OS.SM_CYVSCROLL);
 		} else {
 			BITMAP bitmap = new BITMAP ();
 			OS.GetObject (hBitmap, BITMAP.sizeof, bitmap);
 			OS.DeleteObject (hBitmap);
 			CheckWidth = bitmap.bmWidth / 4;
 			CheckHeight =  bitmap.bmHeight / 3;
 		}
 		WNDCLASSEX lpWndClass = new WNDCLASSEX ();
 		lpWndClass.cbSize = WNDCLASSEX.sizeof;
 		OS.GetClassInfoEx (0, ButtonClass, lpWndClass);
 		ButtonProc = 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 Button (Composite parent, int style) {
 	super (parent, checkStyle (style));
 }

 /**
  * Adds the listener to the collection of listeners who will
  * be notified when the control is selected, by sending
  * it one of the messages defined in the <code>SelectionListener</code>
  * interface.
  * <p>
  * <code>widgetSelected</code> is called when the control is selected.
  * <code>widgetDefaultSelected</code> is not called.
  * </p>
  *
  * @param listener the listener which should be notified
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  *
  * @see SelectionListener
  * @see #removeSelectionListener
  * @see SelectionEvent
  */
 public void addSelectionListener (SelectionListener listener) {
 	checkWidget ();
 	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
 	TypedListener typedListener = new TypedListener (listener);
 	addListener (SWT.Selection,typedListener);
 	addListener (SWT.DefaultSelection,typedListener);
 }

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

 static int checkStyle (int style) {
 	style = checkBits (style, SWT.PUSH, SWT.ARROW, SWT.CHECK, SWT.RADIO, SWT.TOGGLE, 0);
 	if ((style & SWT.PUSH) != 0) {
 		return checkBits (style, SWT.CENTER, SWT.LEFT, SWT.RIGHT, 0, 0, 0);
 	}
 	if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) != 0) {
 		return checkBits (style, SWT.LEFT, SWT.RIGHT, SWT.CENTER, 0, 0, 0);
 	}
 	if ((style & SWT.ARROW) != 0) {
 		return checkBits (style, SWT.UP, SWT.DOWN, SWT.LEFT, SWT.RIGHT, 0, 0);
 	}
 	return style;
 }

 void click () {
 	OS.SendMessage (handle, OS.BM_CLICK, 0, 0);
 }

 public Point computeSize (int wHint, int hHint, boolean changed) {
 	checkWidget ();
 	int border = getBorderWidth ();
 	int width = border * 2, height = border * 2;
 	if ((style & SWT.ARROW) != 0) {
 		if ((style & (SWT.UP | SWT.DOWN)) != 0) {
 			width += OS.GetSystemMetrics (OS.SM_CXVSCROLL);
 			height += OS.GetSystemMetrics (OS.SM_CYVSCROLL);
 		} else {
 			width += OS.GetSystemMetrics (OS.SM_CXHSCROLL);
 			height += OS.GetSystemMetrics (OS.SM_CYHSCROLL);
 		}
 		if (wHint != SWT.DEFAULT) width = wHint + (border * 2);
 		if (hHint != SWT.DEFAULT) height = hHint + (border * 2);
 		return new Point (width, height);
 	}
 	int extra = 0;
 	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
 	if ((bits & (OS.BS_BITMAP | OS.BS_ICON)) == 0) {
 		int oldFont = 0;
 		int hDC = OS.GetDC (handle);
 		int newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
 		if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
 		TEXTMETRIC lptm = new TEXTMETRIC ();
 		OS.GetTextMetrics (hDC, lptm);
 		int length = OS.GetWindowTextLength (handle);
 		if (length == 0) {
 			height += lptm.tmHeight;
 		} else {
 			extra = Math.max (8, lptm.tmAveCharWidth);
 			byte [] buffer = new byte [length + 1];
 			OS.GetWindowText (handle, buffer, length + 1);
 			RECT rect = new RECT ();
 			int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE;
 			OS.DrawText (hDC, buffer, length, rect, flags);
 			width += rect.right - rect.left;
 			height += rect.bottom - rect.top;
 		}
 		if (newFont != 0) OS.SelectObject (hDC, oldFont);
 		OS.ReleaseDC (handle, hDC);
 	} else {
 		if (image != null) {
 			extra = 8;
 			switch (image.type) {
 				case SWT.BITMAP: {
 					BITMAP bm = new BITMAP ();
 					int hImage = image.handle;
 					OS.GetObject (hImage, BITMAP.sizeof, bm);
 					width += bm.bmWidth;  height += bm.bmHeight;
 					break;
 				}
 				case SWT.ICON: {
 					BITMAP bm = new BITMAP ();
 					ICONINFO info = new ICONINFO ();
 					int hImage = image.handle;
 					OS.GetIconInfo (hImage, info);
 					int hBitmap = info.hbmColor;
 					if (hBitmap == 0) hBitmap = info.hbmMask;
 					OS.GetObject (hBitmap, BITMAP.sizeof, bm);
 					if (hBitmap == info.hbmMask) bm.bmHeight /= 2;
 					if (info.hbmColor != 0) OS.DeleteObject (info.hbmColor);
 					if (info.hbmMask != 0) OS.DeleteObject (info.hbmMask);
 					width += bm.bmWidth;  height += bm.bmHeight;
 					break;
 				}
 			}
 		}
 	}
 	if ((style & (SWT.CHECK | SWT.RADIO)) != 0) {
 		width += CheckWidth + extra;
 		height = Math.max (height, CheckHeight + 3);
 	}
 	if ((style & (SWT.PUSH | SWT.TOGGLE)) != 0) {
 		width += 10;  height += 7;
 	}
 	if (wHint != SWT.DEFAULT) width = wHint + (border * 2);
 	if (hHint != SWT.DEFAULT) height = hHint + (border * 2);
 	return new Point (width, height);
 }

 int defaultForeground () {
 	return OS.GetSysColor (OS.COLOR_BTNTEXT);
 }

 /**
  * 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 an <code>ARROW</code> button, in
  * which case, the alignment will indicate the direction of
  * the arrow (one of <code>LEFT</code>, <code>RIGHT</code>,
  * <code>UP</code> or <code>DOWN</code>.
  *
  * @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.ARROW) != 0) {
 		if ((style & SWT.UP) != 0) return SWT.UP;
 		if ((style & SWT.DOWN) != 0) return SWT.DOWN;
 		if ((style & SWT.LEFT) != 0) return SWT.LEFT;
 		if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
 		return SWT.UP;
 	}
 	if ((style & SWT.LEFT) != 0) return SWT.LEFT;
 	if ((style & SWT.CENTER) != 0) return SWT.CENTER;
 	if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
 	return SWT.LEFT;
 }

 boolean getDefault () {
 	if ((style & SWT.PUSH) == 0) return false;
 	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
 	return (bits & OS.BS_DEFPUSHBUTTON) != 0;
 }

 /**
  * 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;
 }

 String getNameText () {
 	return getText ();
 }

 /**
  * Returns <code>true</code> if the receiver is selected,
  * and false otherwise.
  * <p>
  * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
  * it is selected when it is checked. When it is of type <code>TOGGLE</code>,
  * it is selected when it is pushed.
  *
  * @return the selection state
  *
  * @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 boolean getSelection () {
 	checkWidget ();
 	if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) == 0) return false;
 	int state = OS.SendMessage (handle, OS.BM_GETCHECK, 0, 0);
 	return (state & OS.BST_CHECKED) != 0;
 }

 /**
  * Returns the receiver's text, which will be an empty
  * string if it has never been set.
  *
  * @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 ();
 	int length = OS.GetWindowTextLength (handle);
 	if (length == 0) return "";
 	byte [] buffer1 = new byte [length + 1];
 	OS.GetWindowText (handle, buffer1, buffer1.length);
 	char [] buffer2 = Converter.mbcsToWcs (0, buffer1);
 	return new String (buffer2, 0, buffer2.length - 1);
 }

 boolean mnemonicHit () {
 	if (!setFocus ()) return false;
 	/*
 	* Feature in Windows.  When a radio button gets focus,
 	* it selects the button in WM_SETFOCUS.  Therefore, it
 	* is not necessary to click the button or send events
 	* because this has already happened in WM_SETFOCUS.
 	*/
 	if ((style & SWT.RADIO) == 0) click ();
 	return true;
 }

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

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

 /**
  * Removes the listener from the collection of listeners who will
  * be notified when the control is selected.
  *
  * @param listener the listener which should be notified
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
  * </ul>
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  *
  * @see SelectionListener
  * @see #addSelectionListener
  */
 public void removeSelectionListener (SelectionListener listener) {
 	checkWidget ();
 	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
 	if (eventTable == null) return;
 	eventTable.unhook (SWT.Selection, listener);
 	eventTable.unhook (SWT.DefaultSelection,listener);
 }
 void selectRadio () {
 	Control [] children = parent._getChildren ();
 	for (int i=0; i<children.length; i++) {
 		Control child = children [i];
 		if (this != child && child instanceof Button) {
 			Button button = (Button) child;
 			if ((button.style & SWT.RADIO) != 0) {
 				if (button.getSelection ()) {
 					button.setSelection (false);
 					button.postEvent (SWT.Selection);
 				}
 			}
 		}
 	}
 	setSelection (true);
 }

 /**
  * Controls how text, images and arrows will be displayed
  * in the receiver. The argument should be one of
  * <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>
  * unless the receiver is an <code>ARROW</code> button, in
  * which case, the argument indicates the direction of
  * the arrow (one of <code>LEFT</code>, <code>RIGHT</code>,
  * <code>UP</code> or <code>DOWN</code>.
  *
  * @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.ARROW) != 0) {
 		if ((style & (SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT)) == 0) return;
 		style &= ~(SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT);
 		style |= alignment & (SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT);
 		OS.InvalidateRect (handle, null, true);
 		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);
 	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
 	bits &= ~(OS.BS_LEFT | OS.BS_CENTER | OS.BS_RIGHT);
 	if ((style & SWT.LEFT) != 0) bits |= OS.BS_LEFT;
 	if ((style & SWT.CENTER) != 0) bits |= OS.BS_CENTER;
 	if ((style & SWT.RIGHT) != 0) bits |= OS.BS_RIGHT;
 	OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
 	OS.InvalidateRect (handle, null, true);
 }

 void setDefault (boolean value) {
 	if ((style & SWT.PUSH) == 0) return;
 	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
 	bits &= ~OS.BS_DEFPUSHBUTTON;
 	if (value) bits |= OS.BS_DEFPUSHBUTTON;
 	OS.SendMessage (handle, OS.BM_SETSTYLE, bits, 1);
 }

 public boolean setFocus () {
 	if ((style & SWT.ARROW) != 0) return false;
 	if (!super.setFocus ()) return false;
 	menuShell ().setDefaultButton (this, false);
 	return true;
 }

 /**
  * 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 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 ();
 	int hImage = 0, imageBits = 0, fImageType = 0;
 	if (image != null) {
 		hImage = image.handle;
 		switch (image.type) {
 			case SWT.BITMAP:
 				imageBits = OS.BS_BITMAP;
 				fImageType = OS.IMAGE_BITMAP;
 				break;
 			case SWT.ICON:
 				imageBits = OS.BS_ICON;
 				fImageType = OS.IMAGE_ICON;
 				break;
 			default:
 				return;
 		}
 	}
 	this.image = image;
 	int newBits = OS.GetWindowLong (handle, OS.GWL_STYLE);
 	int oldBits = newBits;
 	newBits &= ~(OS.BS_BITMAP | OS.BS_ICON);
 	newBits |= imageBits;
 	if (newBits != oldBits) {
 		OS.SetWindowLong (handle, OS.GWL_STYLE, newBits);
 	}
 	OS.SendMessage (handle, OS.BM_SETIMAGE, fImageType, hImage);
 }
 boolean setRadioFocus () {
 	if ((style & SWT.RADIO) == 0 || !getSelection ()) return false;
 	return setFocus () || !isVisible ();
 }

 /**
  * Sets the selection state of the receiver.
  * <p>
  * When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
  * it is selected when it is checked. When it is of type <code>TOGGLE</code>,
  * it is selected when it is pushed.
  *
  * @param selected the new selection state
  *
  * @exception SWTException <ul>
  *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
  *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
  * </ul>
  */
 public void setSelection (boolean selected) {
 	checkWidget ();
 	if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) == 0) return;
 	int bits = selected ? OS.BST_CHECKED : OS.BST_UNCHECKED;
 	OS.SendMessage (handle, OS.BM_SETCHECK, bits, 0);
 	/*
 	* Feature in Windows.  When a radio button gets focus,
 	* it selects the button in WM_SETFOCUS.  If the previous
 	* saved focus widget was a radio button, allowing the shell
 	* to automatically restore the focus to the previous radio
 	* button will unexpectedly check that button.  The fix is
 	* to set the saved focus widget for the shell to be the
 	* radio button so that when focus is restored, the focus
 	* widget will be the new radio button.
 	*/
 	if (!selected) return;
 	if ((style & SWT.RADIO) == 0) return;
 	menuShell ().setSavedFocus (this);
 }

 /**
  * Sets the receiver's text.
  * <p>
  * This method sets the button label.  The label may include
  * the mnemonic character but must not contain line delimiters.
  * </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);
 	int newBits = OS.GetWindowLong (handle, OS.GWL_STYLE);
 	int oldBits = newBits;
 	newBits &= ~(OS.BS_BITMAP | OS.BS_ICON);
 	if (newBits != oldBits) {
 		OS.SetWindowLong (handle, OS.GWL_STYLE, newBits);
 	}
 	byte [] buffer = Converter.wcsToMbcs (0, string, true);
 	OS.SetWindowText (handle, buffer);
 }

 int widgetStyle () {
 	int bits = super.widgetStyle () | OS.BS_NOTIFY;
 	if ((style & SWT.FLAT) != 0) bits |= OS.BS_FLAT;
 	if ((style & SWT.ARROW) != 0) return bits | OS.BS_OWNERDRAW;
 	if ((style & SWT.LEFT) != 0) bits |= OS.BS_LEFT;
 	if ((style & SWT.CENTER) != 0) bits |= OS.BS_CENTER;
 	if ((style & SWT.RIGHT) != 0) bits |= OS.BS_RIGHT;
 	if ((style & SWT.PUSH) != 0) return bits | OS.BS_PUSHBUTTON | OS.WS_TABSTOP;
 	if ((style & SWT.CHECK) != 0) return bits | OS.BS_CHECKBOX;
 	if ((style & SWT.RADIO) != 0) return bits | OS.BS_RADIOBUTTON;
 	if ((style & SWT.TOGGLE) != 0) return bits | OS.BS_PUSHLIKE | OS.BS_CHECKBOX;
 	return bits | OS.BS_PUSHBUTTON | OS.WS_TABSTOP;
 }

 byte [] windowClass () {
 	return ButtonClass;
 }

 int windowProc () {
 	return ButtonProc;
 }

 LRESULT WM_GETDLGCODE (int wParam, int lParam) {
 	LRESULT result = super.WM_GETDLGCODE (wParam, lParam);
 	if (result != null) return result;
 	if ((style & SWT.ARROW) != 0) {
 		return new LRESULT (OS.DLGC_STATIC);
 	}
 	return result;
 }

 LRESULT WM_SETFOCUS (int wParam, int lParam) {
 	LRESULT result = super.WM_SETFOCUS (wParam, lParam);
 	if (result != null) return result;
 	if ((style & SWT.RADIO) == 0) return result;
 	/*
 	* Feature in Windows. When Windows sets focus to
 	* a radio button, it sets the WM_TABSTOP style.
 	* This is undocumented and unwanted.  The fix is
 	* to clear this style.
 	*/
 	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
 	int code = callWindowProc (OS.WM_SETFOCUS, wParam, lParam);
 	OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
 	return new LRESULT (code);
 }

 LRESULT wmCommandChild (int wParam, int lParam) {
 	int code = wParam >> 16;
 	switch (code) {
 		case OS.BN_CLICKED:
 		case OS.BN_DOUBLECLICKED:
 			if ((style & (SWT.CHECK | SWT.TOGGLE)) != 0) {
 				setSelection (!getSelection ());
 			} else {
 				if ((style & SWT.RADIO) != 0) {
 					if ((parent.getStyle () & SWT.NO_RADIO_GROUP) == 0) {
 						selectRadio ();
 					} else {
 						setSelection (!getSelection ());
 					}
 				}
 			}
 			postEvent (SWT.Selection);
 	}
 	return super.wmCommandChild (wParam, lParam);
 }

 LRESULT wmDrawChild (int wParam, int lParam) {
 	if ((style & SWT.ARROW) == 0) return super.wmDrawChild (wParam, lParam);
 	DRAWITEMSTRUCT struct = new DRAWITEMSTRUCT ();
 	OS.MoveMemory (struct, lParam, DRAWITEMSTRUCT.sizeof);
 	int uState = OS.DFCS_SCROLLLEFT;
 	switch (style & (SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT)) {
 		case SWT.UP: uState = OS.DFCS_SCROLLUP; break;
 		case SWT.DOWN: uState = OS.DFCS_SCROLLDOWN; break;
 		case SWT.LEFT: uState = OS.DFCS_SCROLLLEFT; break;
 		case SWT.RIGHT: uState = OS.DFCS_SCROLLRIGHT; break;
 	}
 	if ((style & SWT.FLAT) == SWT.FLAT) uState |= OS.DFCS_FLAT;
 	if (!OS.IsWindowEnabled (handle)) uState |= OS.DFCS_INACTIVE;
 	if ((struct.itemState & OS.ODS_SELECTED) != 0) uState |= OS.DFCS_PUSHED;
 	RECT rect = new RECT ();
 	OS.SetRect (rect, struct.left, struct.top, struct.right, struct.bottom);
 	OS.DrawFrameControl (struct.hDC, rect, OS.DFC_SCROLL, uState);
 	return null;
 }

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

	/**
	* Instances of this class represent a selectable user interface object that
	* issues notification when pressed and released.
	* <dl>
	* <dt><b>Styles:</b></dt>
	* <dd>ARROW, CHECK, PUSH, RADIO, TOGGLE, FLAT</dd>
	* <dd>LEFT, RIGHT, CENTER</dd>
	* <dt><b>Events:</b></dt>
	* <dd>Selection</dd>
	* </dl>
	* <p>
	* IMPORTANT: This class is intended to be subclassed <em>only</em>
	* within the SWT implementation.
	* </p>
	*/

	public class Button extends Control {
	Image image;
	static final int ButtonProc;
	static final byte [] ButtonClass = Converter.wcsToMbcs (0,"BUTTON\0");
	static final int CheckWidth, CheckHeight;
	static {
	int hBitmap = OS.LoadBitmap (0, OS.OBM_CHECKBOXES);
	if (hBitmap == 0) {
	CheckWidth = OS.GetSystemMetrics (OS.SM_CXVSCROLL);
	CheckHeight = OS.GetSystemMetrics (OS.SM_CYVSCROLL);
	} else {
	BITMAP bitmap = new BITMAP ();
	OS.GetObject (hBitmap, BITMAP.sizeof, bitmap);
	OS.DeleteObject (hBitmap);
	CheckWidth = bitmap.bmWidth / 4;
	CheckHeight = bitmap.bmHeight / 3;
	}
	WNDCLASSEX lpWndClass = new WNDCLASSEX ();
	lpWndClass.cbSize = WNDCLASSEX.sizeof;
	OS.GetClassInfoEx (0, ButtonClass, lpWndClass);
	ButtonProc = 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 Button (Composite parent, int style) {
	super (parent, checkStyle (style));
	}

	/**
	* Adds the listener to the collection of listeners who will
	* be notified when the control is selected, by sending
	* it one of the messages defined in the <code>SelectionListener</code>
	* interface.
	* <p>
	* <code>widgetSelected</code> is called when the control is selected.
	* <code>widgetDefaultSelected</code> is not called.
	* </p>
	*
	* @param listener the listener which should be notified
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	* </ul>
	* @exception SWTException <ul>
	* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	* </ul>
	*
	* @see SelectionListener
	* @see #removeSelectionListener
	* @see SelectionEvent
	*/
	public void addSelectionListener (SelectionListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Selection,typedListener);
	addListener (SWT.DefaultSelection,typedListener);
	}

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

	static int checkStyle (int style) {
	style = checkBits (style, SWT.PUSH, SWT.ARROW, SWT.CHECK, SWT.RADIO, SWT.TOGGLE, 0);
	if ((style & SWT.PUSH) != 0) {
	return checkBits (style, SWT.CENTER, SWT.LEFT, SWT.RIGHT, 0, 0, 0);
	}
	if ((style & (SWT.CHECK \| SWT.RADIO \| SWT.TOGGLE)) != 0) {
	return checkBits (style, SWT.LEFT, SWT.RIGHT, SWT.CENTER, 0, 0, 0);
	}
	if ((style & SWT.ARROW) != 0) {
	return checkBits (style, SWT.UP, SWT.DOWN, SWT.LEFT, SWT.RIGHT, 0, 0);
	}
	return style;
	}

	void click () {
	OS.SendMessage (handle, OS.BM_CLICK, 0, 0);
	}

	public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	int border = getBorderWidth ();
	int width = border * 2, height = border * 2;
	if ((style & SWT.ARROW) != 0) {
	if ((style & (SWT.UP \| SWT.DOWN)) != 0) {
	width += OS.GetSystemMetrics (OS.SM_CXVSCROLL);
	height += OS.GetSystemMetrics (OS.SM_CYVSCROLL);
	} else {
	width += OS.GetSystemMetrics (OS.SM_CXHSCROLL);
	height += OS.GetSystemMetrics (OS.SM_CYHSCROLL);
	}
	if (wHint != SWT.DEFAULT) width = wHint + (border * 2);
	if (hHint != SWT.DEFAULT) height = hHint + (border * 2);
	return new Point (width, height);
	}
	int extra = 0;
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	if ((bits & (OS.BS_BITMAP \| OS.BS_ICON)) == 0) {
	int oldFont = 0;
	int hDC = OS.GetDC (handle);
	int newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	TEXTMETRIC lptm = new TEXTMETRIC ();
	OS.GetTextMetrics (hDC, lptm);
	int length = OS.GetWindowTextLength (handle);
	if (length == 0) {
	height += lptm.tmHeight;
	} else {
	extra = Math.max (8, lptm.tmAveCharWidth);
	byte [] buffer = new byte [length + 1];
	OS.GetWindowText (handle, buffer, length + 1);
	RECT rect = new RECT ();
	int flags = OS.DT_CALCRECT \| OS.DT_SINGLELINE;
	OS.DrawText (hDC, buffer, length, rect, flags);
	width += rect.right - rect.left;
	height += rect.bottom - rect.top;
	}
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	} else {
	if (image != null) {
	extra = 8;
	switch (image.type) {
	case SWT.BITMAP: {
	BITMAP bm = new BITMAP ();
	int hImage = image.handle;
	OS.GetObject (hImage, BITMAP.sizeof, bm);
	width += bm.bmWidth; height += bm.bmHeight;
	break;
	}
	case SWT.ICON: {
	BITMAP bm = new BITMAP ();
	ICONINFO info = new ICONINFO ();
	int hImage = image.handle;
	OS.GetIconInfo (hImage, info);
	int hBitmap = info.hbmColor;
	if (hBitmap == 0) hBitmap = info.hbmMask;
	OS.GetObject (hBitmap, BITMAP.sizeof, bm);
	if (hBitmap == info.hbmMask) bm.bmHeight /= 2;
	if (info.hbmColor != 0) OS.DeleteObject (info.hbmColor);
	if (info.hbmMask != 0) OS.DeleteObject (info.hbmMask);
	width += bm.bmWidth; height += bm.bmHeight;
	break;
	}
	}
	}
	}
	if ((style & (SWT.CHECK \| SWT.RADIO)) != 0) {
	width += CheckWidth + extra;
	height = Math.max (height, CheckHeight + 3);
	}
	if ((style & (SWT.PUSH \| SWT.TOGGLE)) != 0) {
	width += 10; height += 7;
	}
	if (wHint != SWT.DEFAULT) width = wHint + (border * 2);
	if (hHint != SWT.DEFAULT) height = hHint + (border * 2);
	return new Point (width, height);
	}

	int defaultForeground () {
	return OS.GetSysColor (OS.COLOR_BTNTEXT);
	}

	/**
	* 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 an <code>ARROW</code> button, in
	* which case, the alignment will indicate the direction of
	* the arrow (one of <code>LEFT</code>, <code>RIGHT</code>,
	* <code>UP</code> or <code>DOWN</code>.
	*
	* @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.ARROW) != 0) {
	if ((style & SWT.UP) != 0) return SWT.UP;
	if ((style & SWT.DOWN) != 0) return SWT.DOWN;
	if ((style & SWT.LEFT) != 0) return SWT.LEFT;
	if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
	return SWT.UP;
	}
	if ((style & SWT.LEFT) != 0) return SWT.LEFT;
	if ((style & SWT.CENTER) != 0) return SWT.CENTER;
	if ((style & SWT.RIGHT) != 0) return SWT.RIGHT;
	return SWT.LEFT;
	}

	boolean getDefault () {
	if ((style & SWT.PUSH) == 0) return false;
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	return (bits & OS.BS_DEFPUSHBUTTON) != 0;
	}

	/**
	* 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;
	}

	String getNameText () {
	return getText ();
	}

	/**
	* Returns <code>true</code> if the receiver is selected,
	* and false otherwise.
	* <p>
	* When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
	* it is selected when it is checked. When it is of type <code>TOGGLE</code>,
	* it is selected when it is pushed.
	*
	* @return the selection state
	*
	* @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 boolean getSelection () {
	checkWidget ();
	if ((style & (SWT.CHECK \| SWT.RADIO \| SWT.TOGGLE)) == 0) return false;
	int state = OS.SendMessage (handle, OS.BM_GETCHECK, 0, 0);
	return (state & OS.BST_CHECKED) != 0;
	}

	/**
	* Returns the receiver's text, which will be an empty
	* string if it has never been set.
	*
	* @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 ();
	int length = OS.GetWindowTextLength (handle);
	if (length == 0) return "";
	byte [] buffer1 = new byte [length + 1];
	OS.GetWindowText (handle, buffer1, buffer1.length);
	char [] buffer2 = Converter.mbcsToWcs (0, buffer1);
	return new String (buffer2, 0, buffer2.length - 1);
	}

	boolean mnemonicHit () {
	if (!setFocus ()) return false;
	/*
	* Feature in Windows. When a radio button gets focus,
	* it selects the button in WM_SETFOCUS. Therefore, it
	* is not necessary to click the button or send events
	* because this has already happened in WM_SETFOCUS.
	*/
	if ((style & SWT.RADIO) == 0) click ();
	return true;
	}

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

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

	/**
	* Removes the listener from the collection of listeners who will
	* be notified when the control is selected.
	*
	* @param listener the listener which should be notified
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	* </ul>
	* @exception SWTException <ul>
	* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	* </ul>
	*
	* @see SelectionListener
	* @see #addSelectionListener
	*/
	public void removeSelectionListener (SelectionListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection,listener);
	}
	void selectRadio () {
	Control [] children = parent._getChildren ();
	for (int i=0; i<children.length; i++) {
	Control child = children [i];
	if (this != child && child instanceof Button) {
	Button button = (Button) child;
	if ((button.style & SWT.RADIO) != 0) {
	if (button.getSelection ()) {
	button.setSelection (false);
	button.postEvent (SWT.Selection);
	}
	}
	}
	}
	setSelection (true);
	}

	/**
	* Controls how text, images and arrows will be displayed
	* in the receiver. The argument should be one of
	* <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>
	* unless the receiver is an <code>ARROW</code> button, in
	* which case, the argument indicates the direction of
	* the arrow (one of <code>LEFT</code>, <code>RIGHT</code>,
	* <code>UP</code> or <code>DOWN</code>.
	*
	* @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.ARROW) != 0) {
	if ((style & (SWT.UP \| SWT.DOWN \| SWT.LEFT \| SWT.RIGHT)) == 0) return;
	style &= ~(SWT.UP \| SWT.DOWN \| SWT.LEFT \| SWT.RIGHT);
	style \|= alignment & (SWT.UP \| SWT.DOWN \| SWT.LEFT \| SWT.RIGHT);
	OS.InvalidateRect (handle, null, true);
	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);
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	bits &= ~(OS.BS_LEFT \| OS.BS_CENTER \| OS.BS_RIGHT);
	if ((style & SWT.LEFT) != 0) bits \|= OS.BS_LEFT;
	if ((style & SWT.CENTER) != 0) bits \|= OS.BS_CENTER;
	if ((style & SWT.RIGHT) != 0) bits \|= OS.BS_RIGHT;
	OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
	OS.InvalidateRect (handle, null, true);
	}

	void setDefault (boolean value) {
	if ((style & SWT.PUSH) == 0) return;
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	bits &= ~OS.BS_DEFPUSHBUTTON;
	if (value) bits \|= OS.BS_DEFPUSHBUTTON;
	OS.SendMessage (handle, OS.BM_SETSTYLE, bits, 1);
	}

	public boolean setFocus () {
	if ((style & SWT.ARROW) != 0) return false;
	if (!super.setFocus ()) return false;
	menuShell ().setDefaultButton (this, false);
	return true;
	}

	/**
	* 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 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 ();
	int hImage = 0, imageBits = 0, fImageType = 0;
	if (image != null) {
	hImage = image.handle;
	switch (image.type) {
	case SWT.BITMAP:
	imageBits = OS.BS_BITMAP;
	fImageType = OS.IMAGE_BITMAP;
	break;
	case SWT.ICON:
	imageBits = OS.BS_ICON;
	fImageType = OS.IMAGE_ICON;
	break;
	default:
	return;
	}
	}
	this.image = image;
	int newBits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	int oldBits = newBits;
	newBits &= ~(OS.BS_BITMAP \| OS.BS_ICON);
	newBits \|= imageBits;
	if (newBits != oldBits) {
	OS.SetWindowLong (handle, OS.GWL_STYLE, newBits);
	}
	OS.SendMessage (handle, OS.BM_SETIMAGE, fImageType, hImage);
	}
	boolean setRadioFocus () {
	if ((style & SWT.RADIO) == 0 \|\| !getSelection ()) return false;
	return setFocus () \|\| !isVisible ();
	}

	/**
	* Sets the selection state of the receiver.
	* <p>
	* When the receiver is of type <code>CHECK</code> or <code>RADIO</code>,
	* it is selected when it is checked. When it is of type <code>TOGGLE</code>,
	* it is selected when it is pushed.
	*
	* @param selected the new selection state
	*
	* @exception SWTException <ul>
	* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	* </ul>
	*/
	public void setSelection (boolean selected) {
	checkWidget ();
	if ((style & (SWT.CHECK \| SWT.RADIO \| SWT.TOGGLE)) == 0) return;
	int bits = selected ? OS.BST_CHECKED : OS.BST_UNCHECKED;
	OS.SendMessage (handle, OS.BM_SETCHECK, bits, 0);
	/*
	* Feature in Windows. When a radio button gets focus,
	* it selects the button in WM_SETFOCUS. If the previous
	* saved focus widget was a radio button, allowing the shell
	* to automatically restore the focus to the previous radio
	* button will unexpectedly check that button. The fix is
	* to set the saved focus widget for the shell to be the
	* radio button so that when focus is restored, the focus
	* widget will be the new radio button.
	*/
	if (!selected) return;
	if ((style & SWT.RADIO) == 0) return;
	menuShell ().setSavedFocus (this);
	}

	/**
	* Sets the receiver's text.
	* <p>
	* This method sets the button label. The label may include
	* the mnemonic character but must not contain line delimiters.
	* </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);
	int newBits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	int oldBits = newBits;
	newBits &= ~(OS.BS_BITMAP \| OS.BS_ICON);
	if (newBits != oldBits) {
	OS.SetWindowLong (handle, OS.GWL_STYLE, newBits);
	}
	byte [] buffer = Converter.wcsToMbcs (0, string, true);
	OS.SetWindowText (handle, buffer);
	}

	int widgetStyle () {
	int bits = super.widgetStyle () \| OS.BS_NOTIFY;
	if ((style & SWT.FLAT) != 0) bits \|= OS.BS_FLAT;
	if ((style & SWT.ARROW) != 0) return bits \| OS.BS_OWNERDRAW;
	if ((style & SWT.LEFT) != 0) bits \|= OS.BS_LEFT;
	if ((style & SWT.CENTER) != 0) bits \|= OS.BS_CENTER;
	if ((style & SWT.RIGHT) != 0) bits \|= OS.BS_RIGHT;
	if ((style & SWT.PUSH) != 0) return bits \| OS.BS_PUSHBUTTON \| OS.WS_TABSTOP;
	if ((style & SWT.CHECK) != 0) return bits \| OS.BS_CHECKBOX;
	if ((style & SWT.RADIO) != 0) return bits \| OS.BS_RADIOBUTTON;
	if ((style & SWT.TOGGLE) != 0) return bits \| OS.BS_PUSHLIKE \| OS.BS_CHECKBOX;
	return bits \| OS.BS_PUSHBUTTON \| OS.WS_TABSTOP;
	}

	byte [] windowClass () {
	return ButtonClass;
	}

	int windowProc () {
	return ButtonProc;
	}

	LRESULT WM_GETDLGCODE (int wParam, int lParam) {
	LRESULT result = super.WM_GETDLGCODE (wParam, lParam);
	if (result != null) return result;
	if ((style & SWT.ARROW) != 0) {
	return new LRESULT (OS.DLGC_STATIC);
	}
	return result;
	}

	LRESULT WM_SETFOCUS (int wParam, int lParam) {
	LRESULT result = super.WM_SETFOCUS (wParam, lParam);
	if (result != null) return result;
	if ((style & SWT.RADIO) == 0) return result;
	/*
	* Feature in Windows. When Windows sets focus to
	* a radio button, it sets the WM_TABSTOP style.
	* This is undocumented and unwanted. The fix is
	* to clear this style.
	*/
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	int code = callWindowProc (OS.WM_SETFOCUS, wParam, lParam);
	OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
	return new LRESULT (code);
	}

	LRESULT wmCommandChild (int wParam, int lParam) {
	int code = wParam >> 16;
	switch (code) {
	case OS.BN_CLICKED:
	case OS.BN_DOUBLECLICKED:
	if ((style & (SWT.CHECK \| SWT.TOGGLE)) != 0) {
	setSelection (!getSelection ());
	} else {
	if ((style & SWT.RADIO) != 0) {
	if ((parent.getStyle () & SWT.NO_RADIO_GROUP) == 0) {
	selectRadio ();
	} else {
	setSelection (!getSelection ());
	}
	}
	}
	postEvent (SWT.Selection);
	}
	return super.wmCommandChild (wParam, lParam);
	}

	LRESULT wmDrawChild (int wParam, int lParam) {
	if ((style & SWT.ARROW) == 0) return super.wmDrawChild (wParam, lParam);
	DRAWITEMSTRUCT struct = new DRAWITEMSTRUCT ();
	OS.MoveMemory (struct, lParam, DRAWITEMSTRUCT.sizeof);
	int uState = OS.DFCS_SCROLLLEFT;
	switch (style & (SWT.UP \| SWT.DOWN \| SWT.LEFT \| SWT.RIGHT)) {
	case SWT.UP: uState = OS.DFCS_SCROLLUP; break;
	case SWT.DOWN: uState = OS.DFCS_SCROLLDOWN; break;
	case SWT.LEFT: uState = OS.DFCS_SCROLLLEFT; break;
	case SWT.RIGHT: uState = OS.DFCS_SCROLLRIGHT; break;
	}
	if ((style & SWT.FLAT) == SWT.FLAT) uState \|= OS.DFCS_FLAT;
	if (!OS.IsWindowEnabled (handle)) uState \|= OS.DFCS_INACTIVE;
	if ((struct.itemState & OS.ODS_SELECTED) != 0) uState \|= OS.DFCS_PUSHED;
	RECT rect = new RECT ();
	OS.SetRect (rect, struct.left, struct.top, struct.right, struct.bottom);
	OS.DrawFrameControl (struct.hDC, rect, OS.DFC_SCROLL, uState);
	return null;
	}

	}