/******************************************************************************* * Copyright (c) 2000, 2004 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-v10.html *  * Contributors: *     IBM Corporation - initial API and implementation *******************************************************************************/package org.eclipse.swt.widgets;import org.eclipse.swt.internal.win32.*;import org.eclipse.swt.*;/** * Instances of this class are used used to inform or warn the user. * <dl> * <dt><b>Styles:</b></dt> * <dd>ICON_ERROR, ICON_INFORMATION, ICON_QUESTION, ICON_WARNING, ICON_WORKING</dd> * <dd>OK, OK | CANCEL</dd> * <dd>YES | NO, YES | NO | CANCEL</dd> * <dd>RETRY | CANCEL</dd> * <dd>ABORT | RETRY | IGNORE</dd> * <dt><b>Events:</b></dt> * <dd>(none)</dd> * </dl> * <p> * Note: Only one of the styles ICON_ERROR, ICON_INFORMATION, ICON_QUESTION, * ICON_WARNING and ICON_WORKING may be specified. * </p><p> * IMPORTANT: This class is intended to be subclassed <em>only</em> * within the SWT implementation. * </p> */public  class MessageBox extends Dialog {	String message = "";	/** * Constructs a new instance of this class given only its parent. * * @param parent a shell which will be the parent of the new instance * * @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> */public MessageBox (Shell parent) {	this (parent, SWT.OK | SWT.ICON_INFORMATION | SWT.APPLICATION_MODAL);}/** * 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. * * @param parent a shell which will be the parent of the new instance * @param style the style of dialog 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> */public MessageBox (Shell parent, int style) {	super (parent, checkStyle (style));	checkSubclass ();}static int checkStyle (int style) {	if ((style & (SWT.PRIMARY_MODAL | SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) == 0) style |= SWT.APPLICATION_MODAL;	int mask = (SWT.YES | SWT.NO | SWT.OK | SWT.CANCEL | SWT.ABORT | SWT.RETRY | SWT.IGNORE);	int bits = style & mask;	if (bits == SWT.OK || bits == SWT.CANCEL || bits == (SWT.OK | SWT.CANCEL)) return style;	if (bits == SWT.YES || bits == SWT.NO || bits == (SWT.YES | SWT.NO) || bits == (SWT.YES | SWT.NO | SWT.CANCEL)) return style;	if (bits == (SWT.RETRY | SWT.CANCEL) || bits == (SWT.ABORT | SWT.RETRY | SWT.IGNORE)) return style;	style = (style & ~mask) | SWT.OK;	return style;}/** * Returns the dialog's message, which is a description of * the purpose for which it was opened. This message will be * visible on the dialog while it is open. * * @return the message */public String getMessage () {	return message;}/** * Makes the dialog visible and brings it to the front * of the display. * * @return the ID of the button that was selected to dismiss the *         message box (e.g. SWT.OK, SWT.CANCEL, etc...) * * @exception SWTException <ul> *    <li>ERROR_WIDGET_DISPOSED - if the dialog has been disposed</li> *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the dialog</li> * </ul> */public int open () {	/* Compute the MessageBox style */	int buttonBits = 0;	if ((style & SWT.OK) == SWT.OK) buttonBits = OS.MB_OK;	if ((style & (SWT.OK | SWT.CANCEL)) == (SWT.OK | SWT.CANCEL)) buttonBits = OS.MB_OKCANCEL;	if ((style & (SWT.YES | SWT.NO)) == (SWT.YES | SWT.NO)) buttonBits = OS.MB_YESNO;	if ((style & (SWT.YES | SWT.NO | SWT.CANCEL)) == (SWT.YES | SWT.NO | SWT.CANCEL)) buttonBits = OS.MB_YESNOCANCEL;	if ((style & (SWT.RETRY | SWT.CANCEL)) == (SWT.RETRY | SWT.CANCEL)) buttonBits = OS.MB_RETRYCANCEL;	if ((style & (SWT.ABORT | SWT.RETRY | SWT.IGNORE)) == (SWT.ABORT | SWT.RETRY | SWT.IGNORE)) buttonBits = OS.MB_ABORTRETRYIGNORE;	if (buttonBits == 0) buttonBits = OS.MB_OK;	int iconBits = 0;	if ((style & SWT.ICON_ERROR) != 0) iconBits = OS.MB_ICONERROR;	if ((style & SWT.ICON_INFORMATION) != 0) iconBits = OS.MB_ICONINFORMATION;	if ((style & SWT.ICON_QUESTION) != 0) iconBits = OS.MB_ICONQUESTION;	if ((style & SWT.ICON_WARNING) != 0) iconBits = OS.MB_ICONWARNING;	if ((style & SWT.ICON_WORKING) != 0) iconBits = OS.MB_ICONINFORMATION;	/* Only MB_APPLMODAL is supported on WinCE */	int modalBits = 0;	if (OS.IsWinCE) {		if ((style & (SWT.PRIMARY_MODAL | SWT.APPLICATION_MODAL | SWT.SYSTEM_MODAL)) != 0) {			modalBits = OS.MB_APPLMODAL;		}	} else {		if ((style & SWT.PRIMARY_MODAL) != 0) modalBits = OS.MB_APPLMODAL;		if ((style & SWT.APPLICATION_MODAL) != 0) modalBits = OS.MB_TASKMODAL;		if ((style & SWT.SYSTEM_MODAL) != 0) modalBits = OS.MB_SYSTEMMODAL;	}	int bits = buttonBits | iconBits | modalBits;	if ((style & SWT.RIGHT_TO_LEFT) != 0) bits |= OS.MB_RTLREADING;	if ((style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT)) == 0) {		if (parent != null && (parent.style & SWT.MIRRORED) != 0) {			bits |= OS.MB_RTLREADING;		}	}		/*	* Feature in Windows.  System modal is not supported	* on Windows 95 and NT.  The fix is to convert system	* modal to task modal.	*/	if ((bits & OS.MB_SYSTEMMODAL) != 0) {		bits |= OS.MB_TASKMODAL;		bits &= ~OS.MB_SYSTEMMODAL;	}	/*	* Feature in Windows.  In order for MB_TASKMODAL to work,	* the parent HWND of the MessageBox () call must be NULL.	* If the parent is not NULL, MB_TASKMODAL behaves the	* same as MB_APPLMODAL.  The fix to set the parent HWND	* anyway and not rely on MB_MODAL to work by making the	* parent be temporarily modal. 	*/	int hwndOwner = parent != null ? parent.handle : 0;	Shell oldModal = null;	Display display = null;	if ((bits & OS.MB_TASKMODAL) != 0) {		display = parent.getDisplay ();		oldModal = display.getModalDialogShell ();		display.setModalDialogShell (parent);	}	/* Open the message box */	/* Use the character encoding for the default locale */	TCHAR buffer1 = new TCHAR (0, message, true);	TCHAR buffer2 = new TCHAR (0, title, true);	int code = OS.MessageBox (hwndOwner, buffer1, buffer2, bits);		/* Clear the temporarily dialog modal parent */	if ((bits & OS.MB_TASKMODAL) != 0) {		display.setModalDialogShell (oldModal);	}		/*	* This code is intentionally commented.  On some	* platforms, the owner window is repainted right	* away when a dialog window exits.  This behavior	* is currently unspecified.	*///	if (hwndOwner != 0) OS.UpdateWindow (hwndOwner);		/* Compute and return the result */	if (code != 0) {		int type = bits & 0x0F;		if (type == OS.MB_OK) return SWT.OK;		if (type == OS.MB_OKCANCEL) {			return (code == OS.IDOK) ? SWT.OK : SWT.CANCEL;		}		if (type == OS.MB_YESNO) {			return (code == OS.IDYES) ? SWT.YES : SWT.NO;		}		if (type == OS.MB_YESNOCANCEL) {			if (code == OS.IDYES) return SWT.YES;			if (code == OS.IDNO) return SWT.NO;			return SWT.CANCEL;		}		if (type == OS.MB_RETRYCANCEL) {			return (code == OS.IDRETRY) ? SWT.RETRY : SWT.CANCEL;		}		if (type == OS.MB_ABORTRETRYIGNORE) {			if (code == OS.IDRETRY) return SWT.RETRY;			if (code == OS.IDABORT) return SWT.ABORT;			return SWT.IGNORE;		}	}	return SWT.CANCEL;}/** * Sets the dialog's message, which is a description of * the purpose for which it was opened. This message will be * visible on the dialog while it is open. * * @param string the message *  * @exception IllegalArgumentException <ul> *    <li>ERROR_NULL_ARGUMENT - if the string is null</li> * </ul> */public void setMessage (String string) {	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);	message = string;}}