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package org.eclipse.swt.widgets;
/*
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved.
* This file is 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
*/
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.
* <p>
* Note: Currently, null can be passed in for the parent.
* This has the effect of creating the dialog on the currently active
* display if there is one. If there is no current display, the
* dialog is created on a "default" display. <b>Passing in null as
* the parent is not considered to be good coding style,
* and may not be supported in a future release of SWT.</b>
* </p>
*
* @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.
* </p>
* Note: Currently, null can be passed in for the parent.
* This has the effect of creating the dialog on the currently active
* display if there is one. If there is no current display, the
* dialog is created on a "default" display. <b>Passing in null as
* the parent is not considered to be good coding style,
* and may not be supported in a future release of SWT.</b>
* </p>
*
* @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, 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 (parent != null && (parent.style & SWT.RIGHT_TO_LEFT) != 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 is to force the parent
* to be NULL when this style is set.
*/
int hwndOwner = 0;
if (parent != null && (bits & OS.MB_TASKMODAL) == 0) {
hwndOwner = parent.handle;
}
/*
* Feature in Windows. The focus window is not saved and
* and restored automatically by the call to MessageBox().
* The fix is to save and restore the focus window.
*/
int hwndFocus = OS.GetFocus ();
/* 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);
/* Restore focus */
OS.SetFocus (hwndFocus);
/*
* 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
*/
public void setMessage (String string) {
message = string;
}
}
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