org.eclipse.swt.widgets.Button Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of org.eclipse.swt.win32.win32.x86 Show documentation
SWT is an open source widget toolkit for Java designed to provide efficient, portable access to the user-interface facilities of the operating systems on which it is implemented.
The newest version!
/*******************************************************************************
 * Copyright (c) 2000, 2012 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.widgets;


import org.eclipse.swt.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. 
 * 
 * Styles:
 * ARROW, CHECK, PUSH, RADIO, TOGGLE, FLAT, WRAP
 * UP, DOWN, LEFT, RIGHT, CENTER
 * Events:
 * Selection
 * 
 * 
 * Note: Only one of the styles ARROW, CHECK, PUSH, RADIO, and TOGGLE 
 * may be specified.
 * 

 * Note: Only one of the styles LEFT, RIGHT, and CENTER may be specified.
 * 

 * Note: Only one of the styles UP, DOWN, LEFT, and RIGHT may be specified
 * when the ARROW style is specified.
 * 

 * IMPORTANT: This class is not intended to be subclassed.
 * 
 * 
 * @see Button snippets
 * @see SWT Example: ControlExample
 * @see Sample code and further information
 * @noextend This class is not intended to be subclassed by clients.
 */

public class Button extends Control {
	String text = "", message = "";
	Image image, image2, disabledImage;
	ImageList imageList;
	boolean ignoreMouse, grayed;
	static final int MARGIN = 4;
	static final int CHECK_WIDTH, CHECK_HEIGHT;
	static final int ICON_WIDTH = 128, ICON_HEIGHT = 128;
	static /*final*/ boolean COMMAND_LINK = false;
	static final int /*long*/ ButtonProc;
	static final TCHAR ButtonClass = new TCHAR (0, "BUTTON", true);
	static {
		int /*long*/ hBitmap = OS.LoadBitmap (0, OS.OBM_CHECKBOXES);
		if (hBitmap == 0) {
			CHECK_WIDTH = OS.GetSystemMetrics (OS.IsWinCE ? OS.SM_CXSMICON : OS.SM_CXVSCROLL);
			CHECK_HEIGHT = OS.GetSystemMetrics (OS.IsWinCE ? OS.SM_CYSMICON : OS.SM_CYVSCROLL);
		} else {
			BITMAP bitmap = new BITMAP ();
			OS.GetObject (hBitmap, BITMAP.sizeof, bitmap);
			OS.DeleteObject (hBitmap);
			CHECK_WIDTH = bitmap.bmWidth / 4;
			CHECK_HEIGHT =  bitmap.bmHeight / 3;
		}
		WNDCLASS lpWndClass = new WNDCLASS ();
		OS.GetClassInfo (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.
 * 
 * The style value is either one of the style constants defined in
 * class SWT which is applicable to instances of this
 * class, or must be built by bitwise OR'ing together 
 * (that is, using the int "|" operator) two or more
 * of those SWT style constants. The class description
 * lists the style constants that are applicable to the class.
 * Style bits are also inherited from superclasses.
 * 
 *
 * @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 
 *    ERROR_NULL_ARGUMENT - if the parent is null
 * 
 * @exception SWTException 
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
 *    ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
 * 
 *
 * @see SWT#ARROW
 * @see SWT#CHECK
 * @see SWT#PUSH
 * @see SWT#RADIO
 * @see SWT#TOGGLE
 * @see SWT#FLAT
 * @see SWT#UP
 * @see SWT#DOWN
 * @see SWT#LEFT
 * @see SWT#RIGHT
 * @see SWT#CENTER
 * @see Widget#checkSubclass
 * @see Widget#getStyle
 */
public Button (Composite parent, int style) {
	super (parent, checkStyle (style));
}

void _setImage (Image image) {
	if ((style & SWT.COMMAND) != 0) return;
	if (OS.COMCTL32_MAJOR >= 6) {
		if (imageList != null) imageList.dispose ();
		imageList = null;
		if (image != null) {
			imageList = new ImageList (style & SWT.RIGHT_TO_LEFT);
			if (OS.IsWindowEnabled (handle)) {
				imageList.add (image);
			} else {
				if (disabledImage != null) disabledImage.dispose ();
				disabledImage = new Image (display, image, SWT.IMAGE_DISABLE);
				imageList.add (disabledImage);
			}
			BUTTON_IMAGELIST buttonImageList = new BUTTON_IMAGELIST ();
			buttonImageList.himl = imageList.getHandle ();
			int oldBits = OS.GetWindowLong (handle, OS.GWL_STYLE), newBits = oldBits;
			newBits &= ~(OS.BS_LEFT | OS.BS_CENTER | OS.BS_RIGHT);
			if ((style & SWT.LEFT) != 0) newBits |= OS.BS_LEFT;
			if ((style & SWT.CENTER) != 0) newBits |= OS.BS_CENTER;
			if ((style & SWT.RIGHT) != 0) newBits |= OS.BS_RIGHT;
			if (text.length () == 0) {
				if ((style & SWT.LEFT) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_LEFT;
				if ((style & SWT.CENTER) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_CENTER;
				if ((style & SWT.RIGHT) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_RIGHT;
			} else {
				buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_LEFT;
				buttonImageList.margin_left = computeLeftMargin ();
				buttonImageList.margin_right = MARGIN;
				newBits &= ~(OS.BS_CENTER | OS.BS_RIGHT);
				newBits |= OS.BS_LEFT;
			}
			if (newBits != oldBits) {
				OS.SetWindowLong (handle, OS.GWL_STYLE, newBits);
				OS.InvalidateRect (handle, null, true);
			}
			OS.SendMessage (handle, OS.BCM_SETIMAGELIST, 0, buttonImageList);
		} else {
			OS.SendMessage (handle, OS.BCM_SETIMAGELIST, 0, 0);
		}
		/*
		* Bug in Windows.  Under certain cirumstances yet to be
		* isolated, BCM_SETIMAGELIST does not redraw the control
		* when a new image is set.  The fix is to force a redraw.
		*/
		OS.InvalidateRect (handle, null, true);
	} else {
		if (image2 != null) image2.dispose ();
		image2 = null;
		int /*long*/ hImage = 0;
		int imageBits = 0, fImageType = 0;
		if (image != null) {
			switch (image.type) {
				case SWT.BITMAP: {
					Rectangle rect = image.getBounds ();
					ImageData data = image.getImageData ();
					switch (data.getTransparencyType ()) {
						case SWT.TRANSPARENCY_PIXEL: 
							if (rect.width <= ICON_WIDTH && rect.height <= ICON_HEIGHT) {
								image2 = new Image (display, data, data.getTransparencyMask ());
								hImage = image2.handle;
								imageBits = OS.BS_ICON;
								fImageType = OS.IMAGE_ICON;
								break;
							}
							//FALL THROUGH
						case SWT.TRANSPARENCY_ALPHA:
							image2 = new Image (display, rect.width, rect.height);
							GC gc = new GC (image2);
							gc.setBackground (getBackground ());
							gc.fillRectangle (rect);
							gc.drawImage (image, 0, 0);
							gc.dispose ();
							hImage = image2.handle;
							imageBits = OS.BS_BITMAP;
							fImageType = OS.IMAGE_BITMAP;
							break;
						case SWT.TRANSPARENCY_NONE:
							hImage = image.handle;
							imageBits = OS.BS_BITMAP;
							fImageType = OS.IMAGE_BITMAP;
							break;
					}
					break;
				}
				case SWT.ICON: {
					hImage = image.handle;
					imageBits = OS.BS_ICON;
					fImageType = OS.IMAGE_ICON;
					break;
				}
			}
			/*
			* Feature in Windows.  The button control mirrors its image when the
			* flag WS_EX_LAYOUTRTL is set. This behaviour is not desirable in SWT.
			* The fix is to set a mirrored version of real image in the button.
			*/
			if ((style & SWT.RIGHT_TO_LEFT) != 0) {
				if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION (4, 10)) {
					Rectangle rect = image.getBounds ();
					int /*long*/ hDC = OS.GetDC (handle);
					int /*long*/ dstHdc = OS.CreateCompatibleDC (hDC);
					int /*long*/ hBitmap = OS.CreateCompatibleBitmap (hDC, rect.width, rect.height);
					int /*long*/ oldBitmap = OS.SelectObject (dstHdc, hBitmap);
					OS.SetLayout (dstHdc, OS.LAYOUT_RTL);
					if (fImageType == OS.IMAGE_BITMAP) {
						int /*long*/ srcHdc = OS.CreateCompatibleDC (hDC);
						int /*long*/ oldSrcBitmap = OS.SelectObject (srcHdc, hImage);
						OS.SetLayout (dstHdc, 0);
						OS.BitBlt (dstHdc, 0, 0, rect.width, rect.height, srcHdc, 0, 0, OS.SRCCOPY);
						OS.SelectObject (srcHdc, oldSrcBitmap);
						OS.DeleteDC (srcHdc);
					} else {
						Control control = findBackgroundControl ();
						if (control == null) control = this;
						int /*long*/ newBrush = OS.CreateSolidBrush (control.getBackgroundPixel ());
						int /*long*/ oldBrush = OS.SelectObject (dstHdc, newBrush);
						OS.PatBlt (dstHdc, 0, 0, rect.width, rect.height, OS.PATCOPY);
						OS.DrawIconEx (dstHdc, 0, 0, hImage, 0, 0, 0, 0, OS.DI_NORMAL);
						OS.SelectObject (dstHdc, oldBrush);
						OS.DeleteObject (newBrush);
					}
					OS.SelectObject (dstHdc, oldBitmap);
					OS.DeleteDC (dstHdc);
					OS.ReleaseDC (handle, hDC);
					if (image2 != null) image2.dispose ();
					image2 = Image.win32_new (display, SWT.BITMAP, hBitmap);
					imageBits = OS.BS_BITMAP;
					fImageType = OS.IMAGE_BITMAP;
					hImage = hBitmap;
				}
			}
		}
		int newBits = OS.GetWindowLong (handle, OS.GWL_STYLE), 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);
	}
}

void _setText (String text) {
	int oldBits = OS.GetWindowLong (handle, OS.GWL_STYLE), newBits = oldBits;
	if (OS.COMCTL32_MAJOR >= 6) {
		newBits &= ~(OS.BS_LEFT | OS.BS_CENTER | OS.BS_RIGHT);
		if ((style & SWT.LEFT) != 0) newBits |= OS.BS_LEFT;
		if ((style & SWT.CENTER) != 0) newBits |= OS.BS_CENTER;
		if ((style & SWT.RIGHT) != 0) newBits |= OS.BS_RIGHT;
		if (imageList != null) {
			BUTTON_IMAGELIST buttonImageList = new BUTTON_IMAGELIST ();
			buttonImageList.himl = imageList.getHandle ();
			if (text.length () == 0) {
				if ((style & SWT.LEFT) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_LEFT;
				if ((style & SWT.CENTER) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_CENTER;
				if ((style & SWT.RIGHT) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_RIGHT;
			} else {
				buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_LEFT;
				buttonImageList.margin_left = computeLeftMargin ();
				buttonImageList.margin_right = MARGIN;
				newBits &= ~(OS.BS_CENTER | OS.BS_RIGHT);
				newBits |= OS.BS_LEFT;
			}
			OS.SendMessage (handle, OS.BCM_SETIMAGELIST, 0, buttonImageList);
		}
	} else {
		newBits &= ~(OS.BS_BITMAP | OS.BS_ICON);
	}
	if (newBits != oldBits) {
		OS.SetWindowLong (handle, OS.GWL_STYLE, newBits);
		OS.InvalidateRect (handle, null, true);
	}
	/*
	* Bug in Windows.  When a Button 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 ((style & SWT.RIGHT_TO_LEFT) != 0) {
		if (OS.COMCTL32_MAJOR < 6 || !OS.IsAppThemed ()) {
			text = OS.IsWindowEnabled (handle) ? text : " " + text + " ";
		}
	}
	TCHAR buffer = new TCHAR (getCodePage (), text, true);
	OS.SetWindowText (handle, buffer);
}

/**
 * Adds the listener to the collection of listeners who will
 * be notified when the control is selected by the user, by sending
 * it one of the messages defined in the SelectionListener
 * interface.
 * 
 * widgetSelected is called when the control is selected by the user.
 * widgetDefaultSelected is not called.
 * 
 * 
 * When the SWT.RADIO style bit is set, the widgetSelected method is
 * also called when the receiver loses selection because another item in the same radio group 
 * was selected by the user. During widgetSelected the application can use
 * getSelection() to determine the current selected state of the receiver.
 * 
 *
 * @param listener the listener which should be notified
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the listener is null
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @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 /*long*/ callWindowProc (int /*long*/ hwnd, int msg, int /*long*/ wParam, int /*long*/ lParam) {
	if (handle == 0) return 0;
	return OS.CallWindowProc (ButtonProc, hwnd, msg, wParam, lParam);
}

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

void click () {
	/*
	* Feature in Windows.  BM_CLICK sends a fake WM_LBUTTONDOWN and
	* WM_LBUTTONUP in order to click the button.  This causes the
	* application to get unexpected mouse events.  The fix is to
	* ignore mouse events when they are caused by BM_CLICK.
	*/
	ignoreMouse = true;
	OS.SendMessage (handle, OS.BM_CLICK, 0, 0);
	ignoreMouse = false;
}

int computeLeftMargin () {
	if (OS.COMCTL32_MAJOR < 6) return MARGIN;
	if ((style & (SWT.PUSH | SWT.TOGGLE)) == 0) return MARGIN;
	int margin = 0;
	if (image != null && text.length () != 0) {
		Rectangle bounds = image.getBounds ();
		margin += bounds.width + MARGIN * 2;
		int /*long*/ oldFont = 0;
		int /*long*/ hDC = OS.GetDC (handle);
		int /*long*/ newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
		if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
		TCHAR buffer = new TCHAR (getCodePage (), text, true);
		RECT rect = new RECT ();
		int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE;
		OS.DrawText (hDC, buffer, -1, rect, flags);
		margin += rect.right - rect.left;
		if (newFont != 0) OS.SelectObject (hDC, oldFont);
		OS.ReleaseDC (handle, hDC);
		OS.GetClientRect (handle, rect);
		margin = Math.max (MARGIN, (rect.right - rect.left - margin) / 2);
	}
	return margin;
}

public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	int width = 0, height = 0, border = getBorderWidth ();
	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);
		}
	} else {
		if ((style & SWT.COMMAND) != 0) {
			SIZE size = new SIZE ();
			if (wHint != SWT.DEFAULT) {
				size.cx = wHint;
				OS.SendMessage (handle, OS.BCM_GETIDEALSIZE, 0, size);
				width = size.cx;
				height = size.cy;
			} else {
				OS.SendMessage (handle, OS.BCM_GETIDEALSIZE, 0, size);
				width = size.cy;
				height = size.cy;
				size.cy = 0;
				while (size.cy != height) {
					size.cx = width++;
					size.cy = 0;
					OS.SendMessage (handle, OS.BCM_GETIDEALSIZE, 0, size);
				}
			}
		} else {
			int extra = 0;
			boolean hasImage = image != null, hasText = true;
			if (OS.COMCTL32_MAJOR < 6) {
				if ((style & SWT.PUSH) == 0) {
					int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
					hasImage = (bits & (OS.BS_BITMAP | OS.BS_ICON)) != 0;
					if (hasImage) hasText = false;
				}
			}
			if (hasImage) {
				if (image != null) {
					Rectangle rect = image.getBounds ();
					width = rect.width;
					if (hasText && text.length () != 0) {
						width += MARGIN * 2;
					}
					height = rect.height;
					extra = MARGIN * 2;
				}
			}
			if (hasText) {
				int /*long*/ oldFont = 0;
				int /*long*/ hDC = OS.GetDC (handle);
				int /*long*/ newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
				if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
				TEXTMETRIC lptm = OS.IsUnicode ? (TEXTMETRIC) new TEXTMETRICW () : new TEXTMETRICA ();
				OS.GetTextMetrics (hDC, lptm);
				int length = text.length ();
				if (length == 0) {
					height = Math.max (height, lptm.tmHeight);
				} else {
					extra = Math.max (MARGIN * 2, lptm.tmAveCharWidth);
					TCHAR buffer = new TCHAR (getCodePage (), text, true);
					RECT rect = new RECT ();
					int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE;
					if ((style & SWT.WRAP) != 0 && wHint != SWT.DEFAULT) {
						flags = OS.DT_CALCRECT | OS.DT_WORDBREAK;
						rect.right = wHint - width - 2 * border;
						if ((style & (SWT.CHECK | SWT.RADIO)) != 0) {
							rect.right -= CHECK_WIDTH + 3; 
						} else {
							rect.right -= 6;
						}
						if (OS.COMCTL32_MAJOR < 6 || !OS.IsAppThemed ()) {
							rect.right -= 2;
							if ((style & (SWT.CHECK | SWT.RADIO)) != 0) {
								rect.right -= 2;
							}
						}
					}
					OS.DrawText (hDC, buffer, -1, rect, flags);
					width += rect.right - rect.left;
					height = Math.max (height, rect.bottom - rect.top);
				}
				if (newFont != 0) OS.SelectObject (hDC, oldFont);
				OS.ReleaseDC (handle, hDC);
			}
			if ((style & (SWT.CHECK | SWT.RADIO)) != 0) {
				width += CHECK_WIDTH + extra;
				height = Math.max (height, CHECK_HEIGHT + 3);
			}
			if ((style & (SWT.PUSH | SWT.TOGGLE)) != 0) {
				width += 12;  height += 10;
			}
		}
	}
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	width += border * 2; 
	height += border * 2;
	return new Point (width, height);
}

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;
	
	/* Set the theme background */
	if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
		/* 
		* NOTE: On Vista this causes problems when the tab
		* key is pressed for push buttons so disable the
		* theme background drawing for these widgets for
		* now.
		*/
		if (!OS.IsWinCE && OS.WIN32_VERSION < OS.VERSION (6, 0)) {
			state |= THEME_BACKGROUND;
		} else {
			if ((style & (SWT.PUSH | SWT.TOGGLE)) == 0) {
				state |= THEME_BACKGROUND;
			}
		}
	}
	
	/*
	* Bug in Windows.  For some reason, the HBRUSH that
	* is returned from WM_CTRLCOLOR is misaligned when
	* the button uses it to draw.  If the brush is a solid
	* color, this does not matter.  However, if the brush
	* contains an image, the image is misaligned.  The
	* fix is to draw the background in WM_CTRLCOLOR.
	* 
	* NOTE: For comctl32.dll 6.0 with themes disabled,
	* drawing in WM_ERASEBKGND will draw on top of the
	* text of the control.
	*/
	if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
		if ((style & SWT.RADIO) != 0) state |= DRAW_BACKGROUND;
	}
	
	/*
	* Feature in Windows.  Push buttons draw border around
	* the button using the default background color instead
	* of using the color provided by WM_CTRLCOLOR.  The fix
	* is to draw the background in WM_CTRLCOLOR.
	* 
	* NOTE: On Vista this causes problems when the tab key
	* is pressed for push buttons so disable the fix for now.
	*/
	if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
		if (!OS.IsWinCE && OS.WIN32_VERSION < OS.VERSION (6, 0)) {
			if ((style & (SWT.PUSH | SWT.TOGGLE)) != 0) {
				state |= DRAW_BACKGROUND;
			}
		}
	}
}

int defaultBackground () {
	if ((style & (SWT.PUSH | SWT.TOGGLE)) != 0) {
		return OS.GetSysColor (OS.COLOR_BTNFACE);
	}
	return super.defaultBackground ();
}

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

void enableWidget (boolean enabled) {
	super.enableWidget (enabled);
	/*
	* Bug in Windows.  When a button 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 ((style & SWT.RIGHT_TO_LEFT) != 0) {
		if (OS.COMCTL32_MAJOR < 6 || !OS.IsAppThemed ()) {
			int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
			boolean hasImage = (bits & (OS.BS_BITMAP | OS.BS_ICON)) != 0;
			if (!hasImage) {
				String string = enabled ? text : " " + text + " ";
				TCHAR buffer = new TCHAR (getCodePage (), string, true);
				OS.SetWindowText (handle, buffer);
			}
		}
	}
	/*
	* Bug in Windows.  When a button has the style BS_CHECKBOX
	* or BS_RADIOBUTTON, is checked, and is displaying both an
	* image and some text, when BCM_SETIMAGELIST is used to
	* assign an image list for each of the button states, the
	* button does not draw properly.  When the user drags the
	* mouse in and out of the button, it draws using a blank
	* image.  The fix is to set the complete image list only
	* when the button is disabled.
	*/
	updateImageList ();
}

/**
 * Returns a value which describes the position of the
 * text or image in the receiver. The value will be one of
 * LEFT, RIGHT or CENTER
 * unless the receiver is an ARROW button, in 
 * which case, the alignment will indicate the direction of
 * the arrow (one of LEFT, RIGHT, 
 * UP or DOWN).
 *
 * @return the alignment 
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
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 true if the receiver is grayed,
 * and false otherwise. When the widget does not have
 * the CHECK style, return false.
 *
 * @return the grayed state of the checkbox
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @since 3.4
 */
public boolean getGrayed () {
	checkWidget();
	if ((style & SWT.CHECK) == 0) return false;
	return grayed;
}

/**
 * Returns the receiver's image if it has one, or null
 * if it does not.
 *
 * @return the receiver's image
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public Image getImage () {
	checkWidget ();
	return image;
}

/**
 * Returns the widget message. When the widget is created
 * with the style SWT.COMMAND, the message text
 * is displayed to provide further information for the user.
 * 
 * @return the widget message
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @since 3.3
 */
/*public*/ String getMessage () {
	checkWidget ();
	return message;
}

String getNameText () {
	return getText ();
}

/**
 * Returns true if the receiver is selected,
 * and false otherwise.
 * 
 * When the receiver is of type CHECK or RADIO,
 * it is selected when it is checked. When it is of type TOGGLE,
 * it is selected when it is pushed in. If the receiver is of any other type,
 * this method returns false.
 *
 * @return the selection state
 *
 * @exception SWTException 

 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public boolean getSelection () {
	checkWidget ();
	if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) == 0) return false;
	int /*long*/ flags = OS.SendMessage (handle, OS.BM_GETCHECK, 0, 0);
	return flags != OS.BST_UNCHECKED;
}

/**
 * Returns the receiver's text, which will be an empty
 * string if it has never been set or if the receiver is
 * an ARROW button.
 *
 * @return the receiver's text
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public String getText () {
	checkWidget ();
	if ((style & SWT.ARROW) != 0) return "";
	return text;
}

boolean isTabItem () {
	if ((style & SWT.PUSH) != 0) return isTabGroup ();
	return super.isTabItem ();
}

boolean mnemonicHit (char ch) {
	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 ();
	if (imageList != null) imageList.dispose ();
	imageList = null;
	if (disabledImage != null) disabledImage.dispose ();
	disabledImage = null;
	if (image2 != null) image2.dispose ();
	image2 = null;
	text = null;
	image = null;
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the control is selected by the user.
 *
 * @param listener the listener which should no longer be notified
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the listener is null
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 *
 * @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 () {
	/*
	* This code is intentionally commented.  When two groups
	* of radio buttons with the same parent are separated by
	* another control, the correct behavior should be that
	* the two groups act independently.  This is consistent
	* with radio tool and menu items.  The commented code
	* implements this behavior.
	*/
//	int index = 0;
//	Control [] children = parent._getChildren ();
//	while (index < children.length && children [index] != this) index++;
//	int i = index - 1;
//	while (i >= 0 && children [i].setRadioSelection (false)) --i;
//	int j = index + 1;
//	while (j < children.length && children [j].setRadioSelection (false)) j++;
//	setSelection (true);
	Control [] children = parent._getChildren ();
	for (int i=0; iLEFT, RIGHT or CENTER
 * unless the receiver is an ARROW button, in 
 * which case, the argument indicates the direction of
 * the arrow (one of LEFT, RIGHT, 
 * UP or DOWN).
 *
 * @param alignment the new alignment 
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
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 oldBits = OS.GetWindowLong (handle, OS.GWL_STYLE), newBits = oldBits;
	newBits &= ~(OS.BS_LEFT | OS.BS_CENTER | OS.BS_RIGHT);
	if ((style & SWT.LEFT) != 0) newBits |= OS.BS_LEFT;
	if ((style & SWT.CENTER) != 0) newBits |= OS.BS_CENTER;
	if ((style & SWT.RIGHT) != 0) newBits |= OS.BS_RIGHT;
	if (OS.COMCTL32_MAJOR >= 6) {
		if (imageList != null) {
			BUTTON_IMAGELIST buttonImageList = new BUTTON_IMAGELIST ();
			buttonImageList.himl = imageList.getHandle ();
			if (text.length () == 0) {
				if ((style & SWT.LEFT) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_LEFT;
				if ((style & SWT.CENTER) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_CENTER;
				if ((style & SWT.RIGHT) != 0) buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_RIGHT;
			} else {
				buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_LEFT;
				buttonImageList.margin_left = computeLeftMargin ();
				buttonImageList.margin_right = MARGIN;
				newBits &= ~(OS.BS_CENTER | OS.BS_RIGHT);
				newBits |= OS.BS_LEFT;
			}
			OS.SendMessage (handle, OS.BCM_SETIMAGELIST, 0, buttonImageList);
		}
	}
	if (newBits != oldBits) {
		OS.SetWindowLong (handle, OS.GWL_STYLE, newBits);
		OS.InvalidateRect (handle, null, true);
	}
}

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

public boolean setFocus () {
	checkWidget ();
	/*
	* Feature in Windows.  When a radio button gets focus, 
	* it selects the button in WM_SETFOCUS.  The fix is to
	* not assign focus to an unselected radio button.
	*/
	if ((style & SWT.RADIO) != 0 && !getSelection () && display.fixFocus) return false;
	return super.setFocus ();
}

/**
 * Sets the receiver's image to the argument, which may be
 * null indicating that no image should be displayed.
 * 
 * Note that a Button can display an image and text simultaneously
 * on Windows (starting with XP), GTK+ and OSX.  On other platforms,
 * a Button that has an image and text set into it will display the
 * image or text that was set most recently.
 * 
 * @param image the image to display on the receiver (may be null)
 *
 * @exception IllegalArgumentException 
 *    ERROR_INVALID_ARGUMENT - if the image has been disposed
 *  
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void setImage (Image image) {
	checkWidget ();
	if (image != null && image.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
	if ((style & SWT.ARROW) != 0) return;
	this.image = image;
	/* This code is intentionally commented */
//	if (OS.COMCTL32_MAJOR < 6) {
//		if (image == null || text.length () != 0) {
//			_setText (text);
//			return;
//		}
//	}
	_setImage (image);
}

/**
 * Sets the grayed state of the receiver.  This state change 
 * only applies if the control was created with the SWT.CHECK
 * style.
 *
 * @param grayed the new grayed state
 *
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @since 3.4
 */
public void setGrayed (boolean grayed) {
	checkWidget ();
	if ((style & SWT.CHECK) == 0) return;
	this.grayed = grayed;
	int /*long*/ flags = OS.SendMessage (handle, OS.BM_GETCHECK, 0, 0);
	if (grayed) {
		if (flags == OS.BST_CHECKED) updateSelection (OS.BST_INDETERMINATE);
	} else {
		if (flags == OS.BST_INDETERMINATE) updateSelection (OS.BST_CHECKED);
	}
}

/**
 * Sets the widget message. When the widget is created
 * with the style SWT.COMMAND, the message text
 * is displayed to provide further information for the user.
 * 
 * @param message the new message
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the string is null
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 * 
 * @since 3.3
 */
/*public*/ void setMessage (String message) {
	checkWidget ();
	if (message == null) error (SWT.ERROR_NULL_ARGUMENT);
	this.message = message;
	if (OS.COMCTL32_VERSION >= OS.VERSION (6, 1)) {
		if ((style & SWT.COMMAND) != 0) {
			int length = message.length ();
			char [] chars = new char [length + 1];
			message.getChars(0, length, chars, 0);
			OS.SendMessage (handle, OS.BCM_SETNOTE, 0, chars);
		}
	}
}

boolean setRadioFocus (boolean tabbing) {
	if ((style & SWT.RADIO) == 0 || !getSelection ()) return false;
	return tabbing ? setTabItemFocus () : setFocus ();
}

boolean setRadioSelection (boolean value) {
	if ((style & SWT.RADIO) == 0) return false;
	if (getSelection () != value) {
		setSelection (value);
		sendSelectionEvent (SWT.Selection);
	}
	return true;
}

boolean setSavedFocus () {
	/*
	* 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
	* not assign focus to an unselected radio button.
	*/
	if ((style & SWT.RADIO) != 0 && !getSelection ()) return false;
	return super.setSavedFocus ();
}

/**
 * Sets the selection state of the receiver, if it is of type CHECK, 
 * RADIO, or TOGGLE.
 *
 * 
 * When the receiver is of type CHECK or RADIO,
 * it is selected when it is checked. When it is of type TOGGLE,
 * it is selected when it is pushed in.
 *
 * @param selected the new selection state
 *
 * @exception SWTException 

 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void setSelection (boolean selected) {
	checkWidget ();
	if ((style & (SWT.CHECK | SWT.RADIO | SWT.TOGGLE)) == 0) return;
	int flags = selected ? OS.BST_CHECKED : OS.BST_UNCHECKED;
	if ((style & SWT.CHECK) != 0) {
		if (selected && grayed) flags = OS.BST_INDETERMINATE;
	}
	updateSelection (flags);
}

/**
 * Sets the receiver's text.
 * 
 * This method sets the button label.  The label may include
 * the mnemonic character but must not contain line delimiters.
 * 
 * 
 * Mnemonics are indicated by an '&' that causes the next
 * character to be the mnemonic.  When the user presses a
 * key sequence that matches the mnemonic, a selection
 * event occurs. On most platforms, the mnemonic appears
 * underlined but may be emphasized in a platform specific
 * manner.  The mnemonic indicator character '&' can be
 * escaped by doubling it in the string, causing a single
 * '&' to be displayed.
 * 

 * Note that a Button can display an image and text simultaneously
 * on Windows (starting with XP), GTK+ and OSX.  On other platforms,
 * a Button that has an image and text set into it will display the
 * image or text that was set most recently.
 * 
 * @param string the new text
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT - if the text is null
 * 
 * @exception SWTException 
 *    ERROR_WIDGET_DISPOSED - if the receiver has been disposed
 *    ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
 * 
 */
public void setText (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	if ((style & SWT.ARROW) != 0) return;
	text = string;
	/* This code is intentionally commented */
//	if (OS.COMCTL32_MAJOR < 6) {
//		if (text.length () == 0 && image != null) {
//			_setImage (image);
//			return;
//		}
//	}
	_setText (string);
}

void updateImageList () {
	if (OS.COMCTL32_MAJOR >= 6) {
		if (imageList != null) {
			BUTTON_IMAGELIST buttonImageList = new BUTTON_IMAGELIST ();
			OS.SendMessage (handle, OS.BCM_GETIMAGELIST, 0, buttonImageList);
			if (imageList != null) imageList.dispose ();
			imageList = new ImageList (style & SWT.RIGHT_TO_LEFT);
			if (OS.IsWindowEnabled (handle)) {
				imageList.add (image);
			} else {
				if (disabledImage != null) disabledImage.dispose ();
				disabledImage = new Image (display, image, SWT.IMAGE_DISABLE);
				imageList.add (disabledImage);
			}
			buttonImageList.himl = imageList.getHandle ();
			OS.SendMessage (handle, OS.BCM_SETIMAGELIST, 0, buttonImageList);
			/*
			* Bug in Windows.  Under certain cirumstances yet to be
			* isolated, BCM_SETIMAGELIST does not redraw the control
			* when an image is set.  The fix is to force a redraw.
			*/
			OS.InvalidateRect (handle, null, true);
		}
	}	
}

void updateOrientation () {
	super.updateOrientation ();
	updateImageList ();
}

void updateSelection (int flags) {
	if (flags != OS.SendMessage (handle, OS.BM_GETCHECK, 0, 0)) {
		/*
		* Feature in Windows. When BM_SETCHECK is used
		* to set the checked state of a radio or check
		* button, it sets the WS_TABSTOP style.  This
		* is undocumented and unwanted.  The fix is
		* to save and restore the window style bits.
		*/
		int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
		if ((style & SWT.CHECK) != 0) {
			if (flags == OS.BST_INDETERMINATE) {
				bits &= ~OS.BS_CHECKBOX;
				bits |= OS.BS_3STATE;
			} else {
				bits |= OS.BS_CHECKBOX;
				bits &= ~OS.BS_3STATE;
			}
			if (bits != OS.GetWindowLong (handle, OS.GWL_STYLE)) {
				OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
			}
		}
		OS.SendMessage (handle, OS.BM_SETCHECK, flags, 0);
		if (bits != OS.GetWindowLong (handle, OS.GWL_STYLE)) {
			OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
		}
	}
}

int widgetStyle () {
	int bits = super.widgetStyle ();
	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.WRAP) != 0) bits |= OS.BS_MULTILINE;
	if ((style & SWT.PUSH) != 0) return bits | OS.BS_PUSHBUTTON | OS.WS_TABSTOP;
	if ((style & SWT.CHECK) != 0) return bits | OS.BS_CHECKBOX | OS.WS_TABSTOP;
	if ((style & SWT.RADIO) != 0) return bits | OS.BS_RADIOBUTTON;
	if ((style & SWT.TOGGLE) != 0) return bits | OS.BS_PUSHLIKE | OS.BS_CHECKBOX | OS.WS_TABSTOP;
	if ((style & SWT.COMMAND) != 0) return bits | OS.BS_COMMANDLINK | OS.WS_TABSTOP;
	return bits | OS.BS_PUSHBUTTON | OS.WS_TABSTOP;
}

TCHAR windowClass () {
	return ButtonClass;
}

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


LRESULT WM_ERASEBKGND (int /*long*/ wParam, int /*long*/ lParam) {
	LRESULT result = super.WM_ERASEBKGND (wParam, lParam);
	if (result != null) return result;
	/*
	* Bug in Windows.  For some reason, the HBRUSH that
	* is returned from WM_CTRLCOLOR is misaligned when
	* the button uses it to draw.  If the brush is a solid
	* color, this does not matter.  However, if the brush
	* contains an image, the image is misaligned.  The
	* fix is to draw the background in WM_ERASEBKGND.
	*/
	if (OS.COMCTL32_MAJOR < 6) {
		if ((style & (SWT.RADIO | SWT.CHECK)) != 0) {
			if (findImageControl () != null) {
				drawBackground (wParam);
				return LRESULT.ONE;
			}
		}
	}
	return result;
}

LRESULT WM_GETDLGCODE (int /*long*/ wParam, int /*long*/ 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_GETOBJECT (int /*long*/ wParam, int /*long*/ lParam) {
	/*
	* Ensure that there is an accessible object created for this
	* control because support for radio button position in group
	* accessibility is implemented in the accessibility package.
	*/
	if ((style & SWT.RADIO) != 0) {
		if (accessible == null) accessible = new_Accessible (this);
	}
	return super.WM_GETOBJECT (wParam, lParam);
}

LRESULT WM_KILLFOCUS (int /*long*/ wParam, int /*long*/ lParam) {
	LRESULT result = super.WM_KILLFOCUS (wParam, lParam);
	if ((style & SWT.PUSH) != 0 && getDefault ()) {
		menuShell ().setDefaultButton (null, false);
	}
	return result;
}

LRESULT WM_LBUTTONDOWN (int /*long*/ wParam, int /*long*/ lParam) {
	if (ignoreMouse) return null;
	return super.WM_LBUTTONDOWN (wParam, lParam);
}

LRESULT WM_LBUTTONUP (int /*long*/ wParam, int /*long*/ lParam) {
	if (ignoreMouse) return null;
	return super.WM_LBUTTONUP (wParam, lParam);
}

LRESULT WM_SETFOCUS (int /*long*/ wParam, int /*long*/ lParam) {
	/*
	* Feature in Windows. When Windows sets focus to
	* a radio button, it sets the WS_TABSTOP style.
	* This is undocumented and unwanted.  The fix is
	* to save and restore the window style bits.
	*/
	int bits = 0;
	if ((style & SWT.RADIO) != 0) {
		bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	}
	LRESULT result = super.WM_SETFOCUS (wParam, lParam);
	if ((style & SWT.RADIO) != 0) {
		OS.SetWindowLong (handle, OS.GWL_STYLE, bits);
	}
	if ((style & SWT.PUSH) != 0) {
		menuShell ().setDefaultButton (this, false);
	}
	return result;
}

LRESULT WM_SIZE (int /*long*/ wParam, int /*long*/ lParam) {
	LRESULT result = super.WM_SIZE (wParam, lParam);
	if (result != null) return result;
	if (OS.COMCTL32_MAJOR >= 6) {
		if ((style & (SWT.PUSH | SWT.TOGGLE)) != 0) {
			if (imageList != null && text.length () != 0) {
				BUTTON_IMAGELIST buttonImageList = new BUTTON_IMAGELIST ();
				OS.SendMessage (handle, OS.BCM_GETIMAGELIST, 0, buttonImageList);
				buttonImageList.uAlign = OS.BUTTON_IMAGELIST_ALIGN_LEFT;
				buttonImageList.margin_left = computeLeftMargin ();
				buttonImageList.margin_right = MARGIN;
				OS.SendMessage (handle, OS.BCM_SETIMAGELIST, 0, buttonImageList);
			}
		}
	}
	return result;
}

LRESULT WM_SYSCOLORCHANGE (int /*long*/ wParam, int /*long*/ lParam) {
	LRESULT result = super.WM_SYSCOLORCHANGE (wParam, lParam);
	if (result != null) return result;
	if (image2 != null) _setImage (image);
	return result;
}

LRESULT WM_UPDATEUISTATE (int /*long*/ wParam, int /*long*/ lParam) {
	LRESULT result = super.WM_UPDATEUISTATE (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows.  When WM_UPDATEUISTATE is sent to
	* a button, 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 button without drawing the background
	* and avoid the button window proc.
	* 
	* NOTE:  This only happens for radio, check and toggle
	* buttons.
	*/
	if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION (6, 0)) {
		if ((style & (SWT.RADIO | SWT.CHECK | SWT.TOGGLE)) != 0) {
			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);
				int /*long*/ code = OS.DefWindowProc (handle, OS.WM_UPDATEUISTATE, wParam, lParam);
				return new LRESULT (code);
			}
		}
	}
	/*
	* Feature in Windows.  Push and toggle buttons draw directly
	* in WM_UPDATEUISTATE rather than damaging and drawing later
	* in WM_PAINT.  This means that clients who hook WM_PAINT
	* expecting to get all the drawing will not.  The fix is to
	* redraw the control when paint events are hooked.
	*/
	if ((style & (SWT.PUSH | SWT.TOGGLE)) != 0) {
		if (hooks (SWT.Paint) || filters (SWT.Paint)) OS.InvalidateRect (handle, null, true);
	}
	return result;
}

LRESULT wmCommandChild (int /*long*/ wParam, int /*long*/ lParam) {
	int code = OS.HIWORD (wParam);
	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) {
						setSelection (!getSelection ());
					} else {
						selectRadio ();
					}
				}
			}
			sendSelectionEvent (SWT.Selection);
	}
	return super.wmCommandChild (wParam, lParam);
}

LRESULT wmColorChild (int /*long*/ wParam, int /*long*/ lParam) {
	/*
	* Bug in Windows.  For some reason, the HBRUSH that
	* is returned from WM_CTRLCOLOR is misaligned when
	* the button uses it to draw.  If the brush is a solid
	* color, this does not matter.  However, if the brush
	* contains an image, the image is misaligned.  The
	* fix is to draw the background in WM_ERASEBKGND.
	*/
	LRESULT result = super.wmColorChild (wParam, lParam);
	if (OS.COMCTL32_MAJOR < 6) {
		if ((style & (SWT.RADIO | SWT.CHECK)) != 0) {
			if (findImageControl () != null) {
				OS.SetBkMode (wParam, OS.TRANSPARENT);
				return new LRESULT (OS.GetStockObject (OS.NULL_BRUSH));
			}
		}
	}
	return result;
}

LRESULT wmDrawChild (int /*long*/ wParam, int /*long*/ lParam) {
	if ((style & SWT.ARROW) == 0) return super.wmDrawChild (wParam, lParam);
	DRAWITEMSTRUCT struct = new DRAWITEMSTRUCT ();
	OS.MoveMemory (struct, lParam, DRAWITEMSTRUCT.sizeof);
	RECT rect = new RECT ();
	OS.SetRect (rect, struct.left, struct.top, struct.right, struct.bottom);
	if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
		int iStateId = OS.ABS_LEFTNORMAL;
		switch (style & (SWT.UP | SWT.DOWN | SWT.LEFT | SWT.RIGHT)) {
			case SWT.UP: iStateId = OS.ABS_UPNORMAL; break;
			case SWT.DOWN: iStateId = OS.ABS_DOWNNORMAL; break;
			case SWT.LEFT: iStateId = OS.ABS_LEFTNORMAL; break;
			case SWT.RIGHT: iStateId = OS.ABS_RIGHTNORMAL; break;
		}
		/*
		* Feature in Windows.  On Vista only, DrawThemeBackground()
		* does not mirror the drawing. The fix is switch left to right
		* and right to left.
		*/
		if (!OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION (6, 0)) {
			if ((style & SWT.MIRRORED) != 0) {
				if ((style & (SWT.LEFT | SWT.RIGHT)) != 0) {
					iStateId = iStateId == OS.ABS_RIGHTNORMAL ? OS.ABS_LEFTNORMAL : OS.ABS_RIGHTNORMAL; 
				}
			}
		}
		/*
		* NOTE: The normal, hot, pressed and disabled state is
		* computed relying on the fact that the increment between
		* the direction states is invariant (always separated by 4).
		*/
		if (!getEnabled ()) iStateId += OS.ABS_UPDISABLED - OS.ABS_UPNORMAL;
		if ((struct.itemState & OS.ODS_SELECTED) != 0) iStateId += OS.ABS_UPPRESSED - OS.ABS_UPNORMAL;
		OS.DrawThemeBackground (display.hScrollBarTheme (), struct.hDC, OS.SBP_ARROWBTN, iStateId, rect, null);
	} else {
		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 (!getEnabled ()) uState |= OS.DFCS_INACTIVE;
		if ((style & SWT.FLAT) == SWT.FLAT) uState |= OS.DFCS_FLAT;
		if ((struct.itemState & OS.ODS_SELECTED) != 0) uState |= OS.DFCS_PUSHED;
		OS.DrawFrameControl (struct.hDC, rect, OS.DFC_SCROLL, uState);
	}
	return null;
}

}