/****************************************************************************
**
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** This file is part of the QtGui module of the Qt Toolkit.
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** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
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** review the following information:
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** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.0, which can be found at
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** Trolltech ASA (c) 2007
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include <QtGui/qmessagebox.h>

#ifndef QT_NO_MESSAGEBOX

#include <QtGui/qdialogbuttonbox.h>
#include "private/qlabel_p.h"
#include <QtCore/qlist.h>
#include <QtCore/qdebug.h>
#include <QtGui/qstyle.h>
#include <QtGui/qstyleoption.h>
#include <QtGui/qgridlayout.h>
#include <QtGui/qdesktopwidget.h>
#include <QtGui/qpushbutton.h>
#include <QtGui/qaccessible.h>
#include <QtGui/qicon.h>
#include <QtGui/qtextdocument.h>
#include <QtGui/qapplication.h>
#include <QtGui/qtextedit.h>
#include <QtGui/qmenu.h>
#include "qdialog_p.h"
#include <QtGui/qfont.h>
#include <QtGui/qfontmetrics.h>
#include <QtGui/qclipboard.h>

enum Button { Old_Ok = 1, Old_Cancel = 2, Old_Yes = 3, Old_No = 4, Old_Abort = 5, Old_Retry = 6,
              Old_Ignore = 7, Old_YesAll = 8, Old_NoAll = 9, Old_ButtonMask = 0xFF,
              NewButtonFlag = 0xFFFFFC00 };

enum DetailButtonLabel { ShowLabel = 0, HideLabel = 1 };
#ifndef QT_NO_TEXTEDIT
class QMessageBoxDetailsText : public QWidget
{
public:
    class TextEdit : public QTextEdit
    {
    public:
        TextEdit(QWidget *parent=0) : QTextEdit(parent) { }
        void contextMenuEvent(QContextMenuEvent * e)
        {
#ifdef QT_NO_CONTEXTMENU
            Q_UNUSED(e);
#else
            QMenu *menu = createStandardContextMenu();
            menu->exec(e->globalPos());
            delete menu;
#endif
        }
    };

    QMessageBoxDetailsText(QWidget *parent=0)
        : QWidget(parent)
    {
        QVBoxLayout *layout = new QVBoxLayout;
        layout->setMargin(0);
        QFrame *line = new QFrame(this);
        line->setFrameShape(QFrame::HLine);
        line->setFrameShadow(QFrame::Sunken);
        layout->addWidget(line);
        textEdit = new TextEdit();
        textEdit->setFixedHeight(100);
        textEdit->setFocusPolicy(Qt::NoFocus);
        textEdit->setReadOnly(true);
        layout->addWidget(textEdit);
        setLayout(layout);
    }
    void setText(const QString &text) { textEdit->setPlainText(text); }
    QString text() const { return textEdit->toPlainText(); }
    QString label(DetailButtonLabel label)
        { return label == ShowLabel ? QMessageBox::tr("Show Details...")
                                    : QMessageBox::tr("Hide Details..."); }
private:
    TextEdit *textEdit;
};
#endif // QT_NO_TEXTEDIT

#ifndef QT_NO_IMAGEFORMAT_XPM
/* XPM */
static const char * const qtlogo_xpm[] = {
/* width height ncolors chars_per_pixel */
"50 50 17 1",
/* colors */
"  c #000000",
". c #495808",
"X c #2A3304",
"o c #242B04",
"O c #030401",
"+ c #9EC011",
"@ c #93B310",
"# c #748E0C",
"$ c #A2C511",
"% c #8BA90E",
"& c #99BA10",
"* c #060701",
"= c #181D02",
"- c #212804",
"; c #61770A",
": c #0B0D01",
"/ c None",
/* pixels */
"/$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$/",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$+++$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$@;.o=::=o.;@$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$+#X*         **X#+$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$#oO*         O  **o#+$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$&.* OO              O*.&$$$$$$$$$$$$$",
"$$$$$$$$$$$$@XOO            * OO    X&$$$$$$$$$$$$",
"$$$$$$$$$$$@XO OO  O  **:::OOO OOO   X@$$$$$$$$$$$",
"$$$$$$$$$$&XO      O-;#@++@%.oOO      X&$$$$$$$$$$",
"$$$$$$$$$$.O  :  *-#+$$$$$$$$+#- : O O*.$$$$$$$$$$",
"$$$$$$$$$#*OO  O*.&$$$$$$$$$$$$+.OOOO **#$$$$$$$$$",
"$$$$$$$$+-OO O *;$$$$$$$$$$$&$$$$;*     o+$$$$$$$$",
"$$$$$$$$#O*  O .+$$$$$$$$$$@X;$$$+.O    *#$$$$$$$$",
"$$$$$$$$X*    -&$$$$$$$$$$@- :;$$$&-    OX$$$$$$$$",
"$$$$$$$@*O  *O#$$$$$$$$$$@oOO**;$$$#    O*%$$$$$$$",
"$$$$$$$;     -+$$$$$$$$$@o O OO ;+$$-O   *;$$$$$$$",
"$$$$$$$.     ;$$$$$$$$$@-OO OO  X&$$;O    .$$$$$$$",
"$$$$$$$o    *#$$$$$$$$@o  O O O-@$$$#O   *o$$$$$$$",
"$$$$$$+=    *@$$$$$$$@o* OO   -@$$$$&:    =$$$$$$$",
"$$$$$$+:    :+$$$$$$@-      *-@$$$$$$:    :+$$$$$$",
"$$$$$$+:    :+$$$$$@o* O    *-@$$$$$$:    :+$$$$$$",
"$$$$$$$=    :@$$$$@o*OOO      -@$$$$@:    =+$$$$$$",
"$$$$$$$-    O%$$$@o* O O    O O-@$$$#*   OX$$$$$$$",
"$$$$$$$. O *O;$$&o O*O* *O      -@$$;    O.$$$$$$$",
"$$$$$$$;*   Oo+$$;O*O:OO--      Oo@+=    *;$$$$$$$",
"$$$$$$$@*  O O#$$$;*OOOo@@-O     Oo;O*  **@$$$$$$$",
"$$$$$$$$X* OOO-+$$$;O o@$$@-    O O     OX$$$$$$$$",
"$$$$$$$$#*  * O.$$$$;X@$$$$@-O O        O#$$$$$$$$",
"$$$$$$$$+oO O OO.+$$+&$$$$$$@-O         o+$$$$$$$$",
"$$$$$$$$$#*    **.&$$$$$$$$$$@o      OO:#$$$$$$$$$",
"$$$$$$$$$+.   O* O-#+$$$$$$$$+;O    OOO:@$$$$$$$$$",
"$$$$$$$$$$&X  *O    -;#@++@#;=O    O    -@$$$$$$$$",
"$$$$$$$$$$$&X O     O*O::::O      OO    Oo@$$$$$$$",
"$$$$$$$$$$$$@XOO                  OO    O*X+$$$$$$",
"$$$$$$$$$$$$$&.*       **  O      ::    *:#$$$$$$$",
"$$$$$$$$$$$$$$$#o*OO       O    Oo#@-OOO=#$$$$$$$$",
"$$$$$$$$$$$$$$$$+#X:* *     O**X#+$$@-*:#$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$%;.o=::=o.#@$$$$$$@X#$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$+++$$$$$$$$$$$+$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",
"/$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$/",
};
#endif // QT_NO_IMAGEFORMAT_XPM

class QMessageBoxPrivate : public QDialogPrivate
{
    Q_DECLARE_PUBLIC(QMessageBox)

public:
    QMessageBoxPrivate() : escapeButton(0), defaultButton(0), clickedButton(0), detailsButton(0),
#ifndef QT_NO_TEXTEDIT
                           detailsText(0),
#endif
                           compatMode(false), autoAddOkButton(true),
                           detectedEscapeButton(0), informativeLabel(0) { }

    void init(const QString &title = QString(), const QString &text = QString());
    void _q_buttonClicked(QAbstractButton *);

    QAbstractButton *findButton(int button0, int button1, int button2, int flags);
    void addOldButtons(int button0, int button1, int button2);

    QAbstractButton *abstractButtonForId(int id) const;
    int execReturnCode(QAbstractButton *button);

    void detectEscapeButton();
    void updateSize();
    int layoutMinimumWidth();
    void retranslateStrings();

    static int showOldMessageBox(QWidget *parent, QMessageBox::Icon icon,
                                 const QString &title, const QString &text,
                                 int button0, int button1, int button2);
    static int showOldMessageBox(QWidget *parent, QMessageBox::Icon icon,
                                 const QString &title, const QString &text,
                                 const QString &button0Text,
                                 const QString &button1Text,
                                 const QString &button2Text,
                                 int defaultButtonNumber,
                                 int escapeButtonNumber);

    static QMessageBox::StandardButton showNewMessageBox(QWidget *parent,
                QMessageBox::Icon icon, const QString& title, const QString& text,
                QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton);

    QLabel *label;
    QMessageBox::Icon icon;
    QLabel *iconLabel;
    QDialogButtonBox *buttonBox;
    QList<QAbstractButton *> customButtonList;
    QAbstractButton *escapeButton;
    QPushButton *defaultButton;
    QAbstractButton *clickedButton;
    QPushButton *detailsButton;
#ifndef QT_NO_TEXTEDIT
    QMessageBoxDetailsText *detailsText;
#endif
    bool compatMode;
    bool autoAddOkButton;
    QAbstractButton *detectedEscapeButton;
    QLabel *informativeLabel;
};

static QString *translatedTextAboutQt = 0;

void QMessageBoxPrivate::init(const QString &title, const QString &text)
{
    Q_Q(QMessageBox);

    if (!translatedTextAboutQt) {
        translatedTextAboutQt = new QString;
    }

    label = new QLabel;
    label->setObjectName(QLatin1String("qt_msgbox_label"));
    label->setTextInteractionFlags(Qt::TextInteractionFlags(q->style()->styleHint(QStyle::SH_MessageBox_TextInteractionFlags, 0, q)));
    label->setAlignment(Qt::AlignVCenter | Qt::AlignLeft);
    label->setOpenExternalLinks(true);
#if defined(Q_WS_MAC)
    label->setContentsMargins(16, 0, 0, 8);
#elif !defined(Q_WS_QWS)
    label->setContentsMargins(2, 0, 0, 0);
    label->setIndent(9);
#endif
    icon = QMessageBox::NoIcon;
    iconLabel = new QLabel;
    iconLabel->setObjectName(QLatin1String("qt_msgboxex_icon_label"));
    iconLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

    buttonBox = new QDialogButtonBox;
    buttonBox->setObjectName(QLatin1String("qt_msgbox_buttonbox"));
    buttonBox->setCenterButtons(q->style()->styleHint(QStyle::SH_MessageBox_CenterButtons, 0, q));
    QObject::connect(buttonBox, SIGNAL(clicked(QAbstractButton*)),
                     q, SLOT(_q_buttonClicked(QAbstractButton*)));

    QGridLayout *grid = new QGridLayout;
#ifndef Q_WS_MAC
    grid->addWidget(iconLabel, 0, 0, 2, 1, Qt::AlignTop);
    grid->addWidget(label, 0, 1, 1, 1);
    // -- leave space for information label --
    grid->addWidget(buttonBox, 2, 0, 1, 2);
#else
    grid->setMargin(0);
    grid->setSpacing(0);
    q->setContentsMargins(24, 15, 24, 20);
    grid->addWidget(iconLabel, 0, 0, 2, 1, Qt::AlignTop | Qt::AlignLeft);
    grid->addWidget(label, 0, 1, 1, 1);
    // -- leave space for information label --
    grid->setRowStretch(1, 100);
    grid->setRowMinimumHeight(2, 10);
    grid->addWidget(buttonBox, 3, 1, 1, 1);
#endif

    grid->setSizeConstraint(QLayout::SetNoConstraint);
    q->setLayout(grid);

    if (!title.isEmpty() || !text.isEmpty()) {
        q->setWindowTitle(title);
        q->setText(text);
    }
    q->setModal(true);

#ifdef Q_WS_MAC
    QFont f = q->font();
    f.setBold(true);
    label->setFont(f);
#endif
    retranslateStrings();
}

int QMessageBoxPrivate::layoutMinimumWidth()
{
    Q_Q(QMessageBox);

    q->layout()->activate();
    return q->layout()->totalMinimumSize().width();
}

void QMessageBoxPrivate::updateSize()
{
    Q_Q(QMessageBox);

    if (!q->isVisible())
        return;

    QSize screenSize = QApplication::desktop()->availableGeometry(QCursor::pos()).size();
#ifdef Q_WS_QWS
    // the width of the screen, less the window border.
    int hardLimit = screenSize.width() - (q->frameGeometry().width() - q->geometry().width());
#else
    int hardLimit = qMin(screenSize.width() - 480, 1000); // can never get bigger than this
#endif
#ifdef Q_WS_MAC
    int softLimit = qMin(screenSize.width()/2, 420);
#elif defined(Q_WS_QWS)
    int softLimit = qMin(hardLimit, 500);
#else
    // note: ideally on windows, hard and soft limits but it breaks compat
    int softLimit = qMin(screenSize.width()/2, 500);
#endif

    if (informativeLabel)
        informativeLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

    label->setWordWrap(false); // makes the label return min size
    int width = layoutMinimumWidth();

    if (width > softLimit) {
        label->setWordWrap(true);
        width = qMax(softLimit, layoutMinimumWidth());

        if (width > hardLimit) {
            label->d_func()->ensureTextControl();
            if (QTextControl *control = label->d_func()->control) {
                QTextOption opt = control->document()->defaultTextOption();
                opt.setWrapMode(QTextOption::WrapAnywhere);
                control->document()->setDefaultTextOption(opt);
            }
            width = hardLimit;
        }
    }

    if (informativeLabel) {
        label->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
        if (layoutMinimumWidth() > hardLimit) { // longest word is really big, so wrap anywhere
            informativeLabel->d_func()->ensureTextControl();
            if (QTextControl *control = informativeLabel->d_func()->control) {
                QTextOption opt = control->document()->defaultTextOption();
                opt.setWrapMode(QTextOption::WrapAnywhere);
                control->document()->setDefaultTextOption(opt);
            }
        }
        QSizePolicy policy(QSizePolicy::Preferred, QSizePolicy::Preferred);
        policy.setHeightForWidth(label->wordWrap());
        label->setSizePolicy(policy);
        policy.setHeightForWidth(true);
        informativeLabel->setSizePolicy(policy);
    }

    QFontMetrics fm(qApp->font("QWorkspaceTitleBar"));
    int windowTitleWidth = qMin(fm.width(q->windowTitle()) + 50, hardLimit);
    if (windowTitleWidth > width)
        width = windowTitleWidth;

    q->layout()->activate();
    int height = (q->layout()->hasHeightForWidth())
                     ? q->layout()->totalHeightForWidth(width)
                     : q->layout()->totalMinimumSize().height();
    q->setFixedSize(width, height);
    QCoreApplication::removePostedEvents(q, QEvent::LayoutRequest);
}

static int oldButton(int button)
{
    switch (button & QMessageBox::ButtonMask) {
    case QMessageBox::Ok:
        return Old_Ok;
    case QMessageBox::Cancel:
        return Old_Cancel;
    case QMessageBox::Yes:
        return Old_Yes;
    case QMessageBox::No:
        return Old_No;
    case QMessageBox::Abort:
        return Old_Abort;
    case QMessageBox::Retry:
        return Old_Retry;
    case QMessageBox::Ignore:
        return Old_Ignore;
    case QMessageBox::YesToAll:
        return Old_YesAll;
    case QMessageBox::NoToAll:
        return Old_NoAll;
    default:
        return 0;
    }
}

int QMessageBoxPrivate::execReturnCode(QAbstractButton *button)
{
    int ret = buttonBox->standardButton(button);
    if (ret == QMessageBox::NoButton) {
        ret = customButtonList.indexOf(button); // if button == 0, correctly sets ret = -1
    } else if (compatMode) {
        ret = oldButton(ret);
    }
    return ret;
}

void QMessageBoxPrivate::_q_buttonClicked(QAbstractButton *button)
{
    Q_Q(QMessageBox);
#ifndef QT_NO_TEXTEDIT
    if (detailsButton && detailsText && button == detailsButton) {
        detailsButton->setText(detailsText->isHidden() ? detailsText->label(HideLabel) : detailsText->label(ShowLabel));
        detailsText->setHidden(!detailsText->isHidden());
        updateSize();
    } else
#endif
    {
        clickedButton = button;
        q->done(execReturnCode(button)); // does not trigger closeEvent
    }
}

/*!
    \class QMessageBox
    \brief The QMessageBox class provides a modal dialog with a short message,
           an icon, and buttons laid out depending on the current style.
    \ingroup dialogs
    \mainclass

    Message boxes are used to provide informative messages and to ask simple questions.

    \section1 Basic Usage

    The easiest way to pop up a message box in Qt is to call one
    of the static functions QMessageBox::information(),
    QMessageBox::question(), QMessageBox::critical(),
    and QMessageBox::warning(). For example:

    \code
        int ret = QMessageBox::warning(this, tr("My Application"),
                          tr("The document has been modified.\n"
                             "Do you want to save your changes?"),
                          QMessageBox::Save | QMessageBox::Discard
                          | QMessageBox::Cancel,
                          QMessageBox::Save);
    \endcode

    Buttons are specified by combining StandardButtons using the
    bitwise OR operator. The order of the buttons on screen is
    platform-dependent. For example, on Windows, \gui{Save} is
    displayed to the left of \gui{Cancel}, whereas on Mac OS,
    the order is reversed.

    The text part of all message box messages can be either rich text
    or plain text. With certain strings that contain XML meta characters,
    the auto-rich text detection may fail, interpreting plain text
    incorrectly as rich text. In these rare cases, use Qt::convertFromPlainText()
    to convert your plain text string to a visually equivalent rich text string
    or set the text format explicitly with setTextFormat().

    Note that the Microsoft Windows User Interface Guidelines
    recommend using the application name as the window's title.

    The \l{dialogs/standarddialogs}{Standard Dialogs} example shows
    how to use QMessageBox as well as other built-in Qt dialogs.

    \section1 Severity Levels

    QMessageBox supports four severity levels, indicated by an icon:

    \table
    \row
    \o \img qmessagebox-quest.png
    \o \l Question
    \o For message boxes that ask a question as part of normal
    operation. Some style guides recommend using Information for this
    purpose.
    \row
    \o \img qmessagebox-info.png
    \o \l Information
    \o For message boxes that are part of normal operation.
    \row
    \o \img qmessagebox-warn.png
    \o \l Warning
    \o For message boxes that tell the user about unusual errors.
    \row
    \o \img qmessagebox-crit.png
    \o \l Critical
    \o For message boxes that tell the user about critical errors.
    \endtable

    \section1 Advanced Usage

    If the convenience static functions, such as QMessageBox::information()
    and QMessageBox::warning(), are not flexible enough for your needs,
    you can instantiate a QMessageBox on the stack. You can then use addButton() to add
    buttons with standard or arbitrary text.

    When using an instance of QMessageBox with standard buttons, you can test the
    return value of exec() to determine which button was clicked. For example,

    \code
        QMessageBox msgBox;
        msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
        switch (msgBox.exec()) {
        case QMessageBox::Yes:
            // yes was clicked
            break;
        case QMessageBox::No:
            // no was clicked
            break;
        default:
            // should never be reached
            break;
        }
    \endcode

    When using an instance of QMessageBox with custom buttons, you can test the
    value of clickedButton() after calling exec(). For example,

    \code
        QMessageBox msgBox;
        QPushButton *connectButton = msgBox.addButton(tr("Connect"), QMessageBox::ActionRole);
        QPushButton *abortButton = msgBox.addButton(QMessageBox::Abort);

        msgBox.exec();

        if (msgBox.clickedButton() == connectButton) {
            // connect
        } else if (msgBox.clickedButton() == abortButton) {
            // abort
        }
    \endcode

    In the example above, the \gui Connect button is created using the
    addButton() overload that takes a text and a ButtonRole. The ButtonRole
    is used by QMessageBox to determine the ordering of the buttons on
    screen (which varies according to the platform).

    The text(), icon() and iconPixmap() functions provide access to the
    current text and pixmap of the message box. The setText(), setIcon()
    and setIconPixmap() let you change it. The difference between
    setIcon() and setIconPixmap() is that the former accepts a
    QMessageBox::Icon and can be used to set standard icons, whereas the
    latter accepts a QPixmap and can be used to set custom icons.

    setButtonText() and buttonText() provide access to the buttons.

    \section1 Default and Escape Keys

    The default button (i.e., the button that is activated when the
    user presses \key Enter) can be specified using setDefaultButton(). If
    none is specified, QMessageBox will try to find one automatically based
    on the \l{ButtonRole}s of the buttons in the dialog.

    Similarly, the escape button (the button that is activated when
    the user presses \key Esc) is specified using setEscapeButton().
    If no escape button is specified, QMessageBox attempts to automatically
    detect an escape button as follows:

    \list 1
    \o If there is only one button, it is made the escape button.
    \o If there is a \l Cancel button, it is made the escape button.
    \o On Mac OS X only, if there is exactly one button with the role
       QMessageBox::RejectRole, it is made the escape button.
    \endlist

    When an escape button could not be automatically detected, pressing
    \key Esc has no effect.

    \sa QDialogButtonBox, {fowler}{GUI Design Handbook: Message Box}, {Standard Dialogs Example}, {Application Example}
*/

/*!
    \enum QMessageBox::StandardButton
    \since 4.2

    These enums describe flags for standard buttons. Each button has a
    defined \l ButtonRole.

    \value Ok An "OK" button defined with the \l AcceptRole.
    \value Open A "Open" button defined with the \l AcceptRole.
    \value Save A "Save" button defined with the \l AcceptRole.
    \value Cancel A "Cancel" button defined with the \l RejectRole.
    \value Close A "Close" button defined with the \l RejectRole.
    \value Discard A "Discard" or "Don't Save" button, depending on the platform,
                    defined with the \l DestructiveRole.
    \value Apply An "Apply" button defined with the \l ApplyRole.
    \value Reset A "Reset" button defined with the \l ResetRole.
    \value RestoreDefaults A "Restore Defaults" button defined with the \l ResetRole.
    \value Help A "Help" button defined with the \l HelpRole.
    \value SaveAll A "Save All" button defined with the \l AcceptRole.
    \value Yes A "Yes" button defined with the \l YesRole.
    \value YesToAll A "Yes to All" button defined with the \l YesRole.
    \value No A "No" button defined with the \l NoRole.
    \value NoToAll A "No to All" button defined with the \l NoRole.
    \value Abort An "Abort" button defined with the \l RejectRole.
    \value Retry A "Retry" button defined with the \l AcceptRole.
    \value Ignore An "Ignore" button defined with the \l AcceptRole.

    \value NoButton An invalid button.

    \omitvalue FirstButton
    \omitvalue LastButton

    The following values are obsolete:

    \value YesAll Use YesToAll instead.
    \value NoAll Use NoToAll instead.
    \value Default Use the \c defaultButton argument of
           information(), warning(), etc. instead, or call
           setDefaultButton().
    \value Escape Call setEscapeButton() instead.
    \value FlagMask
    \value ButtonMask

    \sa ButtonRole, standardButtons
*/

/*!
    Constructs a message box with no text and no buttons.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    The \a parent argument is passed to the QDialog constructor.
*/
QMessageBox::QMessageBox(QWidget *parent)
: QDialog(*new QMessageBoxPrivate, parent, Qt::MSWindowsFixedSizeDialogHint | Qt::WindowTitleHint | Qt::WindowSystemMenuHint)
{
    Q_D(QMessageBox);
    d->init();
}

/*!
    Constructs a message box with the given \a icon, \a title, \a text,
    and standard \a buttons. (Buttons can also be added at any time
    using addButton().)

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    The \a parent and \a f arguments are passed to the QDialog constructor.

    \sa setWindowTitle(), setText(), setIcon(), setStandardButtons()
*/
QMessageBox::QMessageBox(Icon icon, const QString &title, const QString &text,
                         StandardButtons buttons, QWidget *parent, Qt::WindowFlags f)
: QDialog(*new QMessageBoxPrivate, parent, f | Qt::MSWindowsFixedSizeDialogHint | Qt::WindowTitleHint | Qt::WindowSystemMenuHint)
{
    Q_D(QMessageBox);
    d->init(title, text);
    setIcon(icon);
    if (buttons != NoButton)
        setStandardButtons(buttons);
}

/*!
    Destroys the message box.
*/
QMessageBox::~QMessageBox()
{
}

/*!
    \since 4.2

    Adds the given \a button to the message box with the specified \a
    role.

    \sa removeButton(), button(), setStandardButtons()
*/
void QMessageBox::addButton(QAbstractButton *button, ButtonRole role)
{
    Q_D(QMessageBox);
    if (!button)
        return;
    removeButton(button);
    d->buttonBox->addButton(button, (QDialogButtonBox::ButtonRole)role);
    d->customButtonList.append(button);
    d->autoAddOkButton = false;
}

/*!
    \since 4.2
    \overload

    Creates a button with the given \a text, adds it to the message box for the
    specified \a role, and returns it.
*/
QPushButton *QMessageBox::addButton(const QString& text, ButtonRole role)
{
    Q_D(QMessageBox);
    QPushButton *pushButton = new QPushButton(text);
    addButton(pushButton, role);
    d->updateSize();
    return pushButton;
}

/*!
    \since 4.2
    \overload

    Adds a standard \a button to the message box if it is valid to do so, and
    returns the push button.

    \sa setStandardButtons()
*/
QPushButton *QMessageBox::addButton(StandardButton button)
{
    Q_D(QMessageBox);
    QPushButton *pushButton = d->buttonBox->addButton((QDialogButtonBox::StandardButton)button);
    if (pushButton)
        d->autoAddOkButton = false;
    return pushButton;
}

/*!
    \since 4.2

    Removes \a button from the button box without deleting it.

    \sa addButton(), setStandardButtons()
*/
void QMessageBox::removeButton(QAbstractButton *button)
{
    Q_D(QMessageBox);
    d->customButtonList.removeAll(button);
    if (d->escapeButton == button)
        d->escapeButton = 0;
    if (d->defaultButton == button)
        d->defaultButton = 0;
    d->buttonBox->removeButton(button);
    d->updateSize();
}

/*!
    \property QMessageBox::standardButtons
    \brief collection of standard buttons in the message box
    \since 4.2

    This property controls which standard buttons are used by the message box.

    \sa addButton()
*/
void QMessageBox::setStandardButtons(StandardButtons buttons)
{
    Q_D(QMessageBox);
    d->buttonBox->setStandardButtons(QDialogButtonBox::StandardButtons(int(buttons)));

    QList<QAbstractButton *> buttonList = d->buttonBox->buttons();
    if (!buttonList.contains(d->escapeButton))
        d->escapeButton = 0;
    if (!buttonList.contains(d->defaultButton))
        d->defaultButton = 0;
    d->autoAddOkButton = false;
    d->updateSize();
}

QMessageBox::StandardButtons QMessageBox::standardButtons() const
{
    Q_D(const QMessageBox);
    return QMessageBox::StandardButtons(int(d->buttonBox->standardButtons()));
}

/*!
    \since 4.2

    Returns the standard button enum value corresponding to the given \a button,
    or NoButton if the given \a button isn't a standard button.

    \sa button(), standardButtons()
*/
QMessageBox::StandardButton QMessageBox::standardButton(QAbstractButton *button) const
{
    Q_D(const QMessageBox);
    return (QMessageBox::StandardButton)d->buttonBox->standardButton(button);
}

/*!
    \since 4.2

    Returns a pointer corresponding to the standard button \a which,
    or 0 if the standard button doesn't exist in this message box.

    \sa standardButtons, standardButton()
*/
QAbstractButton *QMessageBox::button(StandardButton which) const
{
    Q_D(const QMessageBox);
    return d->buttonBox->button(QDialogButtonBox::StandardButton(which));
}

/*!
    \since 4.2

    Returns the button that is activated when escape is pressed.

    By default, QMessageBox attempts to automatically detect an
    escape button as follows:

    \list 1
    \o If there is only one button, it is made the escape button.
    \o If there is a \l Cancel button, it is made the escape button.
    \o On Mac OS X only, if there is exactly one button with the role
       QMessageBox::RejectRole, it is made the escape button.
    \endlist

    When an escape button could not be automatically detected, pressing
    \key Esc has no effect.

    \sa addButton()
*/
QAbstractButton *QMessageBox::escapeButton() const
{
    Q_D(const QMessageBox);
    return d->escapeButton;
}

/*!
    \since 4.2

    Sets the button that gets activated when the \key Escape key is
    pressed to \a button.

    \sa addButton(), clickedButton()
*/
void QMessageBox::setEscapeButton(QAbstractButton *button)
{
    Q_D(QMessageBox);
    if (d->buttonBox->buttons().contains(button))
        d->escapeButton = button;
}

/*!
    \since 4.3

    Sets the buttons that gets activated when the \key Escape key is
    pressed to \a button.

    \sa addButton(), clickedButton()
*/
void QMessageBox::setEscapeButton(QMessageBox::StandardButton button)
{
    Q_D(QMessageBox);
    setEscapeButton(d->buttonBox->button(QDialogButtonBox::StandardButton(button)));
}

void QMessageBoxPrivate::detectEscapeButton()
{
    if (escapeButton) { // escape button explicitly set
        detectedEscapeButton = escapeButton;
        return;
    }

    // Cancel button automatically becomes escape button
    detectedEscapeButton = buttonBox->button(QDialogButtonBox::Cancel);
    if (detectedEscapeButton)
        return;

    // If there is only one button, make it the escape button
    const QList<QAbstractButton *> buttons = buttonBox->buttons();
    if (buttons.count() == 1) {
        detectedEscapeButton = buttons.first();
        return;
    }

#ifdef Q_WS_MAC
    // On the Mac, if the message box has one RejectRole button, make it the escape button
    for (int i = 0; i < buttons.count(); i++) {
        if (buttonBox->buttonRole(buttons.at(i)) == QDialogButtonBox::RejectRole) {
            if (detectedEscapeButton) { // already detected!
                detectedEscapeButton = 0;
                return;
            }
            detectedEscapeButton = buttons.at(i);
        }
    }
#endif
}

/*!
    \since 4.2

    Returns the button that was clicked by the user,
    or 0 if the user hit the \key Esc key and
    no \l{setEscapeButton()}{escape button} was set.

    If exec() hasn't been called yet, returns 0.

    Example:

    \code
        QMessageBox messageBox(this);
        QAbstractButton *disconnectButton =
              messageBox.addButton(tr("Disconnect"), QMessageBox::ActionRole);
        ...
        messageBox.exec();
        if (messageBox.clickedButton() == disconnectButton) {
            ...
        }
    \endcode

    \sa standardButton(), button()
*/
QAbstractButton *QMessageBox::clickedButton() const
{
    Q_D(const QMessageBox);
    return d->clickedButton;
}

/*!
    \since 4.2

    Returns the button that should be the message box's
    \l{QPushButton::setDefault()}{default button}. Returns 0
    if no default button was set.

    \sa addButton(), QPushButton::setDefault()
*/
QPushButton *QMessageBox::defaultButton() const
{
    Q_D(const QMessageBox);
    return d->defaultButton;
}

/*!
    \since 4.2

    Sets the message box's \l{QPushButton::setDefault()}{default button}
    to \a button.

    \sa addButton(), QPushButton::setDefault()
*/
void QMessageBox::setDefaultButton(QPushButton *button)
{
    Q_D(QMessageBox);
    if (!d->buttonBox->buttons().contains(button))
        return;
    d->defaultButton = button;
    button->setDefault(true);
    button->setFocus();
}

/*!
    \since 4.3

    Sets the message box's \l{QPushButton::setDefault()}{default button}
    to \a button.

    \sa addButton(), QPushButton::setDefault()
*/
void QMessageBox::setDefaultButton(QMessageBox::StandardButton button)
{
    Q_D(QMessageBox);
    setDefaultButton(d->buttonBox->button(QDialogButtonBox::StandardButton(button)));
}

/*!
    \property QMessageBox::text
    \brief the message box text to be displayed.

    The text will be interpreted either as a plain text or as rich
    text, depending on the text format setting (\l
    QMessageBox::textFormat). The default setting is Qt::AutoText, i.e.
    the message box will try to auto-detect the format of the text.

    The default value of this property is an empty string.

    \sa textFormat
*/
QString QMessageBox::text() const
{
    Q_D(const QMessageBox);
    return d->label->text();
}

void QMessageBox::setText(const QString &text)
{
    Q_D(QMessageBox);
    d->label->setText(text);
    d->label->setWordWrap(d->label->textFormat() == Qt::RichText
        || (d->label->textFormat() == Qt::AutoText && Qt::mightBeRichText(text)));
    d->updateSize();
}

/*!
    \enum QMessageBox::Icon

    This enum has the following values:

    \value NoIcon the message box does not have any icon.

    \value Question an icon indicating that
    the message is asking a question.

    \value Information an icon indicating that
    the message is nothing out of the ordinary.

    \value Warning an icon indicating that the
    message is a warning, but can be dealt with.

    \value Critical an icon indicating that
    the message represents a critical problem.

*/

/*!
    \property QMessageBox::icon
    \brief the message box's icon

    The icon of the message box can be one of the following predefined
    icons:
    \list
    \o QMessageBox::NoIcon
    \o QMessageBox::Question
    \o QMessageBox::Information
    \o QMessageBox::Warning
    \o QMessageBox::Critical
    \endlist

    The actual pixmap used for displaying the icon depends on the
    current \link QWidget::style() GUI style\endlink. You can also set
    a custom pixmap icon using the \l QMessageBox::iconPixmap
    property. The default icon is QMessageBox::NoIcon.

    \sa iconPixmap
*/
QMessageBox::Icon QMessageBox::icon() const
{
    Q_D(const QMessageBox);
    return d->icon;
}

void QMessageBox::setIcon(Icon icon)
{
    Q_D(QMessageBox);
    setIconPixmap(QMessageBox::standardIcon((QMessageBox::Icon)icon));
    d->icon = icon;
}

/*!
    \property QMessageBox::iconPixmap
    \brief the current icon

    The icon currently used by the message box. Note that it's often
    hard to draw one pixmap that looks appropriate in all GUI styles;
    you may want to supply a different pixmap for each platform.

    \sa icon
*/
QPixmap QMessageBox::iconPixmap() const
{
    Q_D(const QMessageBox);
    return *d->iconLabel->pixmap();
}

void QMessageBox::setIconPixmap(const QPixmap &pixmap)
{
    Q_D(QMessageBox);
    d->iconLabel->setPixmap(pixmap);
    d->updateSize();
    d->icon = NoIcon;
}

/*!
    \property QMessageBox::textFormat
    \brief the format of the text displayed by the message box

    The current text format used by the message box. See the \l
    Qt::TextFormat enum for an explanation of the possible options.

    The default format is Qt::AutoText.

    \sa setText()
*/
Qt::TextFormat QMessageBox::textFormat() const
{
    Q_D(const QMessageBox);
    return d->label->textFormat();
}

void QMessageBox::setTextFormat(Qt::TextFormat format)
{
    Q_D(QMessageBox);
    d->label->setTextFormat(format);
    d->label->setWordWrap(format == Qt::RichText
                    || (format == Qt::AutoText && Qt::mightBeRichText(d->label->text())));
    d->updateSize();
}

/*!
    \reimp
*/
bool QMessageBox::event(QEvent *e)
{
    bool result =QDialog::event(e);
    switch (e->type()) {
        case QEvent::LayoutRequest:
            d_func()->updateSize();
            break;
        case QEvent::LanguageChange:
            d_func()->retranslateStrings();
            break;
        default:
            break;
    }
    return result;
}

/*!
    \reimp
*/
void QMessageBox::resizeEvent(QResizeEvent *event)
{
    QDialog::resizeEvent(event);
}

/*!
    \reimp
*/
void QMessageBox::closeEvent(QCloseEvent *e)
{
    Q_D(QMessageBox);
    if (!d->detectedEscapeButton) {
        e->ignore();
        return;
    }
    QDialog::closeEvent(e);
    d->clickedButton = d->detectedEscapeButton;
    setResult(d->execReturnCode(d->detectedEscapeButton));
}

/*!
    \reimp
*/
void QMessageBox::changeEvent(QEvent *ev)
{
    Q_D(QMessageBox);
    switch (ev->type()) {
    case QEvent::StyleChange:
    {
        if (d->icon != NoIcon)
            setIcon(d->icon);
        Qt::TextInteractionFlags flags(style()->styleHint(QStyle::SH_MessageBox_TextInteractionFlags, 0, this));
        d->label->setTextInteractionFlags(flags);
        d->buttonBox->setCenterButtons(style()->styleHint(QStyle::SH_MessageBox_CenterButtons, 0, this));
        if (d->informativeLabel)
            d->informativeLabel->setTextInteractionFlags(flags);
        // intentional fall through
    }
    case QEvent::FontChange:
    case QEvent::ApplicationFontChange:
#ifdef Q_WS_MAC
    {
        QFont f = font();
        f.setBold(true);
        d->label->setFont(f);
    }
#endif
    default:
        break;
    }
    QDialog::changeEvent(ev);
}

/*!
    \reimp
*/
void QMessageBox::keyPressEvent(QKeyEvent *e)
{
    Q_D(QMessageBox);
    if (e->key() == Qt::Key_Escape
#ifdef Q_WS_MAC
        || (e->modifiers() == Qt::ControlModifier && e->key() == Qt::Key_Period)
#endif
        ) {
            if (d->detectedEscapeButton) {
#ifdef Q_WS_MAC
                d->detectedEscapeButton->animateClick();
#else
                d->detectedEscapeButton->click();
#endif
            }
            return;
        }

#ifdef Q_OS_WIN
        if (e == QKeySequence::Copy) {
            QString separator = QString::fromLatin1("---------------------------\n");
            QString textToCopy = separator;
            separator.prepend(QLatin1String("\n"));
            textToCopy += windowTitle() + separator; // title
            textToCopy += d->label->text() + separator; // text

            if (d->informativeLabel)
                textToCopy += d->informativeLabel->text() + separator;

            QString buttonTexts;
            QList<QAbstractButton *> buttons = d->buttonBox->buttons();
            for (int i = 0; i < buttons.count(); i++) {
                buttonTexts += buttons[i]->text() + QLatin1String("   ");
            }
            textToCopy += buttonTexts + separator;

            qApp->clipboard()->setText(textToCopy);
            return;
        }
#endif

#ifndef QT_NO_SHORTCUT
    if (!(e->modifiers() & Qt::AltModifier)) {
        int key = e->key() & ~((int)Qt::MODIFIER_MASK|(int)Qt::UNICODE_ACCEL);
        if (key) {
            const QList<QAbstractButton *> buttons = d->buttonBox->buttons();
            for (int i = 0; i < buttons.count(); ++i) {
                QAbstractButton *pb = buttons.at(i);
                int acc = pb->shortcut() & ~((int)Qt::MODIFIER_MASK|(int)Qt::UNICODE_ACCEL);
                if (acc == key) {
                    pb->animateClick();
                    return;
                }
            }
        }
    }
#endif
    QDialog::keyPressEvent(e);
}

/*!
    \reimp
*/
void QMessageBox::showEvent(QShowEvent *e)
{
    Q_D(QMessageBox);
    if (d->autoAddOkButton)
        addButton(Ok);
    if (d->detailsButton)
        addButton(d->detailsButton, QMessageBox::ActionRole);
    d->detectEscapeButton();
    d->updateSize();

#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(this, 0, QAccessible::Alert);
#endif
#ifdef Q_WS_WIN
    HMENU systemMenu = GetSystemMenu((HWND)winId(), FALSE);
    if (!d->detectedEscapeButton) {
        EnableMenuItem(systemMenu, SC_CLOSE, MF_BYCOMMAND|MF_GRAYED);
    }
    else {
        EnableMenuItem(systemMenu, SC_CLOSE, MF_BYCOMMAND|MF_ENABLED);
    }
#endif
    QDialog::showEvent(e);
}

static QMessageBox::StandardButton showNewMessageBox(QWidget *parent,
    QMessageBox::Icon icon,
    const QString& title, const QString& text,
    QMessageBox::StandardButtons buttons,
    QMessageBox::StandardButton defaultButton)
{
    // necessary for source compatibility with Qt 4.0 and 4.1
    // handles (Yes, No) and (Yes|Default, No)
    if (defaultButton && !(buttons & defaultButton))
        return (QMessageBox::StandardButton)
                    QMessageBoxPrivate::showOldMessageBox(parent, icon, title,
                                                            text, int(buttons),
                                                            int(defaultButton), 0);

    QMessageBox msgBox(icon, title, text, QMessageBox::NoButton, parent);
    QDialogButtonBox *buttonBox = qFindChild<QDialogButtonBox*>(&msgBox);
    Q_ASSERT(buttonBox != 0);

    uint mask = QMessageBox::FirstButton;
    while (mask <= QMessageBox::LastButton) {
        uint sb = buttons & mask;
        mask <<= 1;
        if (!sb)
            continue;
        QPushButton *button = msgBox.addButton((QMessageBox::StandardButton)sb);
        // Choose the first accept role as the default
        if (msgBox.defaultButton())
            continue;
        if ((defaultButton == QMessageBox::NoButton && buttonBox->buttonRole(button) == QDialogButtonBox::AcceptRole)
            || (defaultButton != QMessageBox::NoButton && sb == uint(defaultButton)))
            msgBox.setDefaultButton(button);
    }
    if (msgBox.exec() == -1)
        return QMessageBox::Cancel;
    return msgBox.standardButton(msgBox.clickedButton());
}

/*!
    \since 4.2

    Opens an information message box with the title \a title and
    the text \a text. The standard buttons \a buttons is added to the
    message box. \a defaultButton specifies the button be used as the
    defaultButton. If the \a defaultButton is set to QMessageBox::NoButton,
    QMessageBox picks a suitable default automatically.

    Returns the identity of the standard button that was activated. If \key Esc
    was pressed, returns the \l{Default and Escape Keys}{escape button} (if any).

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa question(), warning(), critical()
*/
QMessageBox::StandardButton QMessageBox::information(QWidget *parent, const QString &title,
                               const QString& text, StandardButtons buttons,
                               StandardButton defaultButton)
{
    return showNewMessageBox(parent, Information, title, text, buttons,
                             defaultButton);
}


/*!
    \since 4.2

    Opens a question message box with the title \a title and
    the text \a text. The standard buttons \a buttons is added to the
    message box. \a defaultButton specifies the button be used as the
    defaultButton. If the \a defaultButton is set to QMessageBox::NoButton,
    QMessageBox picks a suitable default automatically.

    Returns the identity of the standard button that was activated. If \key Esc
    was pressed, returns the \l{Default and Escape Keys}{escape button} (if any).

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa information(), warning(), critical()
*/
QMessageBox::StandardButton QMessageBox::question(QWidget *parent, const QString &title,
                            const QString& text, StandardButtons buttons,
                            StandardButton defaultButton)
{
    return showNewMessageBox(parent, Question, title, text, buttons, defaultButton);
}

/*!
    \since 4.2

    Opens a warning message box with the title \a title and
    the text \a text. The standard buttons \a buttons is added to the
    message box. \a defaultButton specifies the button be used as the
    defaultButton.  If the \a defaultButton is set to QMessageBox::NoButton,
    QMessageBox picks a suitable default automatically.

    Returns the identity of the standard button that was activated. If \key Esc
    was pressed, returns the \l{Default and Escape Keys}{escape button} (if any).

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa question(), information(), critical()
*/
QMessageBox::StandardButton QMessageBox::warning(QWidget *parent, const QString &title,
                        const QString& text, StandardButtons buttons,
                        StandardButton defaultButton)
{
    return showNewMessageBox(parent, Warning, title, text, buttons, defaultButton);
}

/*!
    \since 4.2

    Opens a critical message box with the title \a title and
    the text \a text. The standard buttons \a buttons is added to the
    message box. \a defaultButton specifies the button be used as the
    defaultButton. If the \a defaultButton is set to QMessageBox::NoButton,
    QMessageBox picks a suitable default automatically.

    Returns the identity of the standard button that was activated. If \key Esc
    was pressed, returns the \l{Default and Escape Keys}{escape button} (if any).

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa question(), warning(), information()
*/
QMessageBox::StandardButton QMessageBox::critical(QWidget *parent, const QString &title,
                         const QString& text, StandardButtons buttons,
                         StandardButton defaultButton)
{
    return showNewMessageBox(parent, Critical, title, text, buttons, defaultButton);
}

/*!
    Displays a simple about box with title \a title and text \a
    text. The about box's parent is \a parent.

    about() looks for a suitable icon in four locations:

    \list 1
    \o It prefers \link QWidget::windowIcon() parent->icon() \endlink
    if that exists.
    \o If not, it tries the top-level widget containing \a parent.
    \o If that fails, it tries the \link
    QApplication::activeWindow() active window. \endlink
    \o As a last resort it uses the Information icon.
    \endlist

    The about box has a single button labelled "OK".

    \sa QWidget::windowIcon() QApplication::activeWindow()
*/
void QMessageBox::about(QWidget *parent, const QString &title,
                        const QString &text)
{
    QMessageBox mb(title, text, Information, Ok + Default, 0, 0, parent);
    QIcon icon = mb.windowIcon();
    QSize size = icon.actualSize(QSize(64, 64));
    mb.setIconPixmap(icon.pixmap(size));
    mb.exec();
}

/*!
    Displays a simple message box about Qt, with the given \a title
    and centered over \a parent (if \a parent is not 0). The message
    includes the version number of Qt being used by the application.

    This is useful for inclusion in the \gui Help menu of an application,
    as shown in the \l{mainwindows/menus}{Menus} example.

    QApplication provides this functionality as a slot.

    \sa QApplication::aboutQt()
*/
void QMessageBox::aboutQt(QWidget *parent, const QString &title)
{
    QMessageBox mb(parent);

    QString c = title;
    if (c.isEmpty())
        c = tr("About Qt");
    mb.setWindowTitle(c);
    mb.setText(*translatedTextAboutQt);
#ifndef QT_NO_IMAGEFORMAT_XPM
    QImage logo(qtlogo_xpm);
#else
    QImage logo;
#endif

    if (qGray(mb.palette().color(QPalette::Active, QPalette::Text).rgb()) >
        qGray(mb.palette().color(QPalette::Active, QPalette::Base).rgb()))
    {
        // light on dark, adjust some colors
        logo.setColor(0, 0xffffffff);
        logo.setColor(1, 0xff666666);
        logo.setColor(2, 0xffcccc66);
        logo.setColor(4, 0xffcccccc);
        logo.setColor(6, 0xffffff66);
        logo.setColor(7, 0xff999999);
        logo.setColor(8, 0xff3333ff);
        logo.setColor(9, 0xffffff33);
        logo.setColor(11, 0xffcccc99);
    }
    QPixmap pm = QPixmap::fromImage(logo);
    if (!pm.isNull())
        mb.setIconPixmap(pm);
    mb.addButton(QMessageBox::Ok);
    mb.exec();
}

/*!
    \internal
*/
QSize QMessageBox::sizeHint() const
{
    // ### Qt 5: remove
    return QDialog::sizeHint();
}

/////////////////////////////////////////////////////////////////////////////////////////
// Source and binary compatibility routines for 4.0 and 4.1

static QMessageBox::StandardButton newButton(int button)
{
    // this is needed for source compatibility with Qt 4.0 and 4.1
    if (button == QMessageBox::NoButton || (button & NewButtonFlag))
        return QMessageBox::StandardButton(button & QMessageBox::ButtonMask);

#if QT_VERSION < 0x050000
    // this is needed for binary compatibility with Qt 4.0 and 4.1
    switch (button & Old_ButtonMask) {
    case Old_Ok:
        return QMessageBox::Ok;
    case Old_Cancel:
        return QMessageBox::Cancel;
    case Old_Yes:
        return QMessageBox::Yes;
    case Old_No:
        return QMessageBox::No;
    case Old_Abort:
        return QMessageBox::Abort;
    case Old_Retry:
        return QMessageBox::Retry;
    case Old_Ignore:
        return QMessageBox::Ignore;
    case Old_YesAll:
        return QMessageBox::YesToAll;
    case Old_NoAll:
        return QMessageBox::NoToAll;
    default:
        return QMessageBox::NoButton;
    }
#endif
}

static bool detectedCompat(int button0, int button1, int button2)
{
    if (button0 != 0 && !(button0 & NewButtonFlag))
        return true;
    if (button1 != 0 && !(button1 & NewButtonFlag))
        return true;
    if (button2 != 0 && !(button2 & NewButtonFlag))
        return true;
    return false;
}

QAbstractButton *QMessageBoxPrivate::findButton(int button0, int button1, int button2, int flags)
{
    Q_Q(QMessageBox);
    int button = 0;

    if (button0 & flags) {
        button = button0;
    } else if (button1 & flags) {
        button = button1;
    } else if (button2 & flags) {
        button = button2;
    }
    return q->button(newButton(button));
}

void QMessageBoxPrivate::addOldButtons(int button0, int button1, int button2)
{
    Q_Q(QMessageBox);
    q->addButton(newButton(button0));
    q->addButton(newButton(button1));
    q->addButton(newButton(button2));
    q->setDefaultButton(
        static_cast<QPushButton *>(findButton(button0, button1, button2, QMessageBox::Default)));
    q->setEscapeButton(findButton(button0, button1, button2, QMessageBox::Escape));
    compatMode = detectedCompat(button0, button1, button2);
}

QAbstractButton *QMessageBoxPrivate::abstractButtonForId(int id) const
{
    Q_Q(const QMessageBox);
    QAbstractButton *result = customButtonList.value(id);
    if (result)
        return result;
    if (id & QMessageBox::FlagMask)    // for compatibility with Qt 4.0/4.1 (even if it is silly)
        return 0;
    return q->button(newButton(id));
}

int QMessageBoxPrivate::showOldMessageBox(QWidget *parent, QMessageBox::Icon icon,
                                          const QString &title, const QString &text,
                                          int button0, int button1, int button2)
{
    QMessageBox messageBox(icon, title, text, QMessageBox::NoButton, parent);
    messageBox.d_func()->addOldButtons(button0, button1, button2);
    return messageBox.exec();
}

int QMessageBoxPrivate::showOldMessageBox(QWidget *parent, QMessageBox::Icon icon,
                                            const QString &title, const QString &text,
                                            const QString &button0Text,
                                            const QString &button1Text,
                                            const QString &button2Text,
                                            int defaultButtonNumber,
                                            int escapeButtonNumber)
{
    QMessageBox messageBox(icon, title, text, QMessageBox::NoButton, parent);
    QString myButton0Text = button0Text;
    if (myButton0Text.isEmpty())
        myButton0Text = QDialogButtonBox::tr("OK");
    messageBox.addButton(myButton0Text, QMessageBox::ActionRole);
    if (!button1Text.isEmpty())
        messageBox.addButton(button1Text, QMessageBox::ActionRole);
    if (!button2Text.isEmpty())
        messageBox.addButton(button2Text, QMessageBox::ActionRole);

    const QList<QAbstractButton *> &buttonList = messageBox.d_func()->customButtonList;
    messageBox.setDefaultButton(static_cast<QPushButton *>(buttonList.value(defaultButtonNumber)));
    messageBox.setEscapeButton(buttonList.value(escapeButtonNumber));

    return messageBox.exec();
}

void QMessageBoxPrivate::retranslateStrings()
{
#ifndef QT_NO_TEXTEDIT
    if (detailsButton)
        detailsButton->setText(detailsText->isHidden() ? detailsText->label(HideLabel) : detailsText->label(ShowLabel));
#endif

#if defined(QT_NON_COMMERCIAL)
    QT_NC_MSGBOX
#else
    *translatedTextAboutQt = QMessageBox::tr(
        "<h3>About Qt</h3>"
        "%1<p>Qt is a C++ toolkit for cross-platform "
        "application development.</p>"
        "<p>Qt provides single-source "
        "portability across MS&nbsp;Windows, Mac&nbsp;OS&nbsp;X, "
        "Linux, and all major commercial Unix variants. Qt is also"
        " available for embedded devices as Qtopia Core.</p>"
        "<p>Qt is a Trolltech product. See "
        "<a href=\"http://www.trolltech.com/qt/\">www.trolltech.com/qt/</a> for more information.</p>"
       )
#if QT_EDITION != QT_EDITION_OPENSOURCE
       .arg(QMessageBox::tr("<p>This program uses Qt version %1.</p>"))
#else
       .arg(QMessageBox::tr("<p>This program uses Qt Open Source Edition version %1.</p>"
               "<p>Qt Open Source Edition is intended for the development "
               "of Open Source applications. You need a commercial Qt "
               "license for development of proprietary (closed source) "
               "applications.</p>"
               "<p>Please see <a href=\"http://www.trolltech.com/company/model/\">www.trolltech.com/company/model/</a> "
               "for an overview of Qt licensing.</p>"))
#endif
       .arg(QLatin1String(QT_VERSION_STR));
#endif

}

/*!
    \obsolete

    Constructs a message box with a \a title, a \a text, an \a icon,
    and up to three buttons.

    The \a icon must be one of the following:
    \list
    \o QMessageBox::NoIcon
    \o QMessageBox::Question
    \o QMessageBox::Information
    \o QMessageBox::Warning
    \o QMessageBox::Critical
    \endlist

    Each button, \a button0, \a button1 and \a button2, can have one
    of the following values:
    \list
    \o QMessageBox::NoButton
    \o QMessageBox::Ok
    \o QMessageBox::Cancel
    \o QMessageBox::Yes
    \o QMessageBox::No
    \o QMessageBox::Abort
    \o QMessageBox::Retry
    \o QMessageBox::Ignore
    \o QMessageBox::YesAll
    \o QMessageBox::NoAll
    \endlist

    Use QMessageBox::NoButton for the later parameters to have fewer
    than three buttons in your message box. If you don't specify any
    buttons at all, QMessageBox will provide an Ok button.

    One of the buttons can be OR-ed with the QMessageBox::Default
    flag to make it the default button (clicked when Enter is
    pressed).

    One of the buttons can be OR-ed with the QMessageBox::Escape flag
    to make it the cancel or close button (clicked when \key Esc is
    pressed).

    \quotefromfile snippets/dialogs/dialogs.cpp
    \skipto // hardware failure
    \skipto QMessageBox mb("Application Name",
    \printuntil // try again

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    The \a parent and \a f arguments are passed to
    the QDialog constructor.

    \sa setWindowTitle(), setText(), setIcon()
*/
QMessageBox::QMessageBox(const QString &title, const QString &text, Icon icon,
                             int button0, int button1, int button2, QWidget *parent,
                             Qt::WindowFlags f)
    : QDialog(*new QMessageBoxPrivate, parent,
              f /*| Qt::MSWindowsFixedSizeDialogHint #### */| Qt::WindowTitleHint | Qt::WindowSystemMenuHint)
{
    Q_D(QMessageBox);
    d->init(title, text);
    setIcon(icon);
    d->addOldButtons(button0, button1, button2);
}

/*!
    \obsolete

    Opens an information message box with the given \a title and the
    \a text. The dialog may have up to three buttons. Each of the
    buttons, \a button0, \a button1 and \a button2 may be set to one
    of the following values:

    \list
    \o QMessageBox::NoButton
    \o QMessageBox::Ok
    \o QMessageBox::Cancel
    \o QMessageBox::Yes
    \o QMessageBox::No
    \o QMessageBox::Abort
    \o QMessageBox::Retry
    \o QMessageBox::Ignore
    \o QMessageBox::YesAll
    \o QMessageBox::NoAll
    \endlist

    If you don't want all three buttons, set the last button, or last
    two buttons to QMessageBox::NoButton.

    One button can be OR-ed with QMessageBox::Default, and one
    button can be OR-ed with QMessageBox::Escape.

    Returns the identity (QMessageBox::Ok, or QMessageBox::No, etc.)
    of the button that was clicked.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa question(), warning(), critical()
*/
int QMessageBox::information(QWidget *parent, const QString &title, const QString& text,
                               int button0, int button1, int button2)
{
    return QMessageBoxPrivate::showOldMessageBox(parent, Information, title, text,
                                                   button0, button1, button2);
}

/*!
    \obsolete
    \overload

    Displays an information message box with the given \a title and
    \a text, as well as one, two or three buttons. Returns the index
    of the button that was clicked (0, 1 or 2).

    \a button0Text is the text of the first button, and is optional.
    If \a button0Text is not supplied, "OK" (translated) will be
    used. \a button1Text is the text of the second button, and is
    optional. \a button2Text is the text of the third button, and is
    optional. \a defaultButtonNumber (0, 1 or 2) is the index of the
    default button; pressing Return or Enter is the same as clicking
    the default button. It defaults to 0 (the first button). \a
    escapeButtonNumber is the index of the escape button; pressing
    \key Esc is the same as clicking this button. It defaults to -1;
    supply 0, 1 or 2 to make pressing \key Esc equivalent to clicking
    the relevant button.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa question(), warning(), critical()
*/

int QMessageBox::information(QWidget *parent, const QString &title, const QString& text,
                               const QString& button0Text, const QString& button1Text,
                               const QString& button2Text, int defaultButtonNumber,
                               int escapeButtonNumber)
{
    return QMessageBoxPrivate::showOldMessageBox(parent, Information, title, text,
                                                   button0Text, button1Text, button2Text,
                                                   defaultButtonNumber, escapeButtonNumber);
}

/*!
    \obsolete

    Opens a question message box with the given \a title and \a text.
    The dialog may have up to three buttons. Each of the buttons, \a
    button0, \a button1 and \a button2 may be set to one of the
    following values:

    \list
    \o QMessageBox::NoButton
    \o QMessageBox::Ok
    \o QMessageBox::Cancel
    \o QMessageBox::Yes
    \o QMessageBox::No
    \o QMessageBox::Abort
    \o QMessageBox::Retry
    \o QMessageBox::Ignore
    \o QMessageBox::YesAll
    \o QMessageBox::NoAll
    \endlist

    If you don't want all three buttons, set the last button, or last
    two buttons to QMessageBox::NoButton.

    One button can be OR-ed with QMessageBox::Default, and one
    button can be OR-ed with QMessageBox::Escape.

    Returns the identity (QMessageBox::Yes, or QMessageBox::No, etc.)
    of the button that was clicked.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa information(), warning(), critical()
*/
int QMessageBox::question(QWidget *parent, const QString &title, const QString& text,
                            int button0, int button1, int button2)
{
    return QMessageBoxPrivate::showOldMessageBox(parent, Question, title, text,
                                                   button0, button1, button2);
}

/*!
    \obsolete
    \overload

    Displays a question message box with the given \a title and \a
    text, as well as one, two or three buttons. Returns the index of
    the button that was clicked (0, 1 or 2).

    \a button0Text is the text of the first button, and is optional.
    If \a button0Text is not supplied, "OK" (translated) will be used.
    \a button1Text is the text of the second button, and is optional.
    \a button2Text is the text of the third button, and is optional.
    \a defaultButtonNumber (0, 1 or 2) is the index of the default
    button; pressing Return or Enter is the same as clicking the
    default button. It defaults to 0 (the first button). \a
    escapeButtonNumber is the index of the Escape button; pressing
    Escape is the same as clicking this button. It defaults to -1;
    supply 0, 1 or 2 to make pressing Escape equivalent to clicking
    the relevant button.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa information(), warning(), critical()
*/
int QMessageBox::question(QWidget *parent, const QString &title, const QString& text,
                            const QString& button0Text, const QString& button1Text,
                            const QString& button2Text, int defaultButtonNumber,
                            int escapeButtonNumber)
{
    return QMessageBoxPrivate::showOldMessageBox(parent, Question, title, text,
                                                   button0Text, button1Text, button2Text,
                                                   defaultButtonNumber, escapeButtonNumber);
}


/*!
    \obsolete

    Opens a warning message box with the given \a title and \a text.
    The dialog may have up to three buttons. Each of the button
    parameters, \a button0, \a button1 and \a button2 may be set to
    one of the following values:

    \list
    \o QMessageBox::NoButton
    \o QMessageBox::Ok
    \o QMessageBox::Cancel
    \o QMessageBox::Yes
    \o QMessageBox::No
    \o QMessageBox::Abort
    \o QMessageBox::Retry
    \o QMessageBox::Ignore
    \o QMessageBox::YesAll
    \o QMessageBox::NoAll
    \endlist

    If you don't want all three buttons, set the last button, or last
    two buttons to QMessageBox::NoButton.

    One button can be OR-ed with QMessageBox::Default, and one
    button can be OR-ed with QMessageBox::Escape.

    Returns the identity (QMessageBox::Ok or QMessageBox::No or ...)
    of the button that was clicked.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa information(), question(), critical()
*/
int QMessageBox::warning(QWidget *parent, const QString &title, const QString& text,
                           int button0, int button1, int button2)
{
    return QMessageBoxPrivate::showOldMessageBox(parent, Warning, title, text,
                                                   button0, button1, button2);
}

/*!
    \obsolete
    \overload

    Displays a warning message box with the given \a title and \a
    text, as well as one, two, or three buttons. Returns the number
    of the button that was clicked (0, 1, or 2).

    \a button0Text is the text of the first button, and is optional.
    If \a button0Text is not supplied, "OK" (translated) will be used.
    \a button1Text is the text of the second button, and is optional,
    and \a button2Text is the text of the third button, and is
    optional. \a defaultButtonNumber (0, 1 or 2) is the index of the
    default button; pressing Return or Enter is the same as clicking
    the default button. It defaults to 0 (the first button). \a
    escapeButtonNumber is the index of the Escape button; pressing
    Escape is the same as clicking this button. It defaults to -1;
    supply 0, 1, or 2 to make pressing Escape equivalent to clicking
    the relevant button.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa information(), question(), critical()
*/
int QMessageBox::warning(QWidget *parent, const QString &title, const QString& text,
                           const QString& button0Text, const QString& button1Text,
                           const QString& button2Text, int defaultButtonNumber,
                           int escapeButtonNumber)
{
    return QMessageBoxPrivate::showOldMessageBox(parent, Warning, title, text,
                                                   button0Text, button1Text, button2Text,
                                                   defaultButtonNumber, escapeButtonNumber);
}

/*!
    \obsolete

    Opens a critical message box with the given \a title and \a text.
    The dialog may have up to three buttons. Each of the button
    parameters, \a button0, \a button1 and \a button2 may be set to
    one of the following values:

    \list
    \o QMessageBox::NoButton
    \o QMessageBox::Ok
    \o QMessageBox::Cancel
    \o QMessageBox::Yes
    \o QMessageBox::No
    \o QMessageBox::Abort
    \o QMessageBox::Retry
    \o QMessageBox::Ignore
    \o QMessageBox::YesAll
    \o QMessageBox::NoAll
    \endlist

    If you don't want all three buttons, set the last button, or last
    two buttons to QMessageBox::NoButton.

    One button can be OR-ed with QMessageBox::Default, and one
    button can be OR-ed with QMessageBox::Escape.

    Returns the identity (QMessageBox::Ok, or QMessageBox::No, etc.)
    of the button that was clicked.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa information(), question(), warning()
*/

int QMessageBox::critical(QWidget *parent, const QString &title, const QString& text,
                          int button0, int button1, int button2)
{
    return QMessageBoxPrivate::showOldMessageBox(parent, Critical, title, text,
                                                 button0, button1, button2);
}

/*!
    \obsolete
    \overload

    Displays a critical error message box with the given \a title and
    \a text, as well as one, two, or three buttons. Returns the
    number of the button that was clicked (0, 1 or 2).

    \a button0Text is the text of the first button, and is optional.
    If \a button0Text is not supplied, "OK" (translated) will be used.
    \a button1Text is the text of the second button, and is optional,
    and \a button2Text is the text of the third button, and is
    optional. \a defaultButtonNumber (0, 1 or 2) is the index of the
    default button; pressing Return or Enter is the same as clicking
    the default button. It defaults to 0 (the first button). \a
    escapeButtonNumber is the index of the Escape button; pressing
    Escape is the same as clicking this button. It defaults to -1;
    supply 0, 1, or 2 to make pressing Escape equivalent to clicking
    the relevant button.

    If \a parent is 0, the message box becomes an application-global
    modal dialog box. If \a parent is a widget, the message box
    becomes modal relative to \a parent.

    \sa information(), question(), warning()
*/
int QMessageBox::critical(QWidget *parent, const QString &title, const QString& text,
                            const QString& button0Text, const QString& button1Text,
                            const QString& button2Text, int defaultButtonNumber,
                            int escapeButtonNumber)
{
    return QMessageBoxPrivate::showOldMessageBox(parent, Critical, title, text,
                                                   button0Text, button1Text, button2Text,
                                                   defaultButtonNumber, escapeButtonNumber);
}


/*!
    \obsolete

    Returns the text of the message box button \a button, or
    an empty string if the message box does not contain the button.

    Use button() and QPushButton::text() instead.
*/
QString QMessageBox::buttonText(int button) const
{
    Q_D(const QMessageBox);

    if (QAbstractButton *abstractButton = d->abstractButtonForId(button)) {
        return abstractButton->text();
    } else if (d->buttonBox->buttons().isEmpty() && (button == Ok || button == Old_Ok)) {
        // for compatibility with Qt 4.0/4.1
        return QDialogButtonBox::tr("OK");
    }
    return QString();
}

/*!
    \obsolete

    Sets the text of the message box button \a button to \a text.
    Setting the text of a button that is not in the message box is
    silently ignored.

    Use addButton() instead.
*/
void QMessageBox::setButtonText(int button, const QString &text)
{
    Q_D(QMessageBox);
    if (QAbstractButton *abstractButton = d->abstractButtonForId(button)) {
        abstractButton->setText(text);
    } else if (d->buttonBox->buttons().isEmpty() && (button == Ok || button == Old_Ok)) {
        // for compatibility with Qt 4.0/4.1
        addButton(QMessageBox::Ok)->setText(text);
    }
}

#ifndef QT_NO_TEXTEDIT
/*!
    \property QMessageBox::detailedText
    \brief the text to be displayed in the details area.
    \since 4.2

    The text will be interpreted as a plain text. The default value of this property is an empty string.
*/
QString QMessageBox::detailedText() const
{
    Q_D(const QMessageBox);
    return d->detailsText ? d->detailsText->text() : QString();
}

void QMessageBox::setDetailedText(const QString &text)
{
    Q_D(QMessageBox);
    if (text.isEmpty()) {
        delete d->detailsText;
        d->detailsText = 0;
        removeButton(d->detailsButton);
        delete d->detailsButton;
        d->detailsButton = 0;
        return;
    }

    if (!d->detailsText) {
        d->detailsText = new QMessageBoxDetailsText(this);
        QGridLayout* grid = qobject_cast<QGridLayout*>(layout());
        if (grid)
            grid->addWidget(d->detailsText, grid->rowCount(), 0, 1, grid->columnCount());
        d->detailsText->hide();
    }
    if (!d->detailsButton) {
        d->detailsButton = new QPushButton(d->detailsText->label(ShowLabel), this);
        QPushButton hideDetails(d->detailsText->label(HideLabel));
        d->detailsButton->setFixedSize(d->detailsButton->sizeHint().expandedTo(hideDetails.sizeHint()));
    }
    d->detailsText->setText(text);
}
#endif // QT_NO_TEXTEDIT

/*!
    \property QMessageBox::informativeText
    \brief the informative text that provides a fuller description for the message
    \since 4.2

    Infromative text can be used to expand upon the text() to give more information
    to the user. On the Mac, this text appears in small system font below the text().
    On other platforms, it is simply appended to the existing text.
*/
QString QMessageBox::informativeText() const
{
    Q_D(const QMessageBox);
    return d->informativeLabel ? d->informativeLabel->text() : QString();
}

void QMessageBox::setInformativeText(const QString &text)
{
    Q_D(QMessageBox);
    if (text.isEmpty()) {
        layout()->removeWidget(d->informativeLabel);
        delete d->informativeLabel;
        d->informativeLabel = 0;
#ifndef Q_WS_MAC
        d->label->setContentsMargins(2, 0, 0, 0);
#endif
        return;
    }

    if (!d->informativeLabel) {
        QLabel *label = new QLabel;
        label->setObjectName(QLatin1String("qt_msgbox_informativelabel"));
        label->setTextInteractionFlags(Qt::TextInteractionFlags(style()->styleHint(QStyle::SH_MessageBox_TextInteractionFlags, 0, this)));
        label->setAlignment(Qt::AlignTop | Qt::AlignLeft);
        label->setOpenExternalLinks(true);
        label->setWordWrap(true);
#ifndef Q_WS_MAC
        d->label->setContentsMargins(2, 0, 0, 0);
        label->setContentsMargins(2, 0, 0, 6);
        label->setIndent(9);
#else
        label->setContentsMargins(16, 0, 0, 0);
        // apply a smaller font the information label on the mac
        extern QHash<QByteArray, QFont> *qt_app_fonts_hash();
        label->setFont(qt_app_fonts_hash()->value("QTipLabel"));
#endif
        label->setWordWrap(true);
        QGridLayout *grid = static_cast<QGridLayout *>(layout());
        grid->addWidget(label, 1, 1, 1, 1);
        d->informativeLabel = label;
    }
    d->informativeLabel->setText(text);
}

/*!
    \since 4.2

    This function shadows QWidget::setWindowTitle().

    Sets the title of the message box to \a title. On Mac OS X,
    the window title is ignored (as required by the Mac OS X
    Guidelines).
*/
void QMessageBox::setWindowTitle(const QString &title)
{
    // Message boxes on the mac do not have a title
#ifndef Q_WS_MAC
    QDialog::setWindowTitle(title);
#else
    Q_UNUSED(title);
#endif
}


/*!
    \since 4.2

    This function shadows QWidget::setWindowModality().

    Sets the modality of the message box to \a windowModality.

    On Mac OS X, if the modality is set to Qt::WindowModal and the message box
    has a parent, then the message box will be a Qt::Sheet, otherwise the
    message box will be a standard dialog.
*/
void QMessageBox::setWindowModality(Qt::WindowModality windowModality)
{
    QDialog::setWindowModality(windowModality);

    if (parentWidget() && windowModality == Qt::WindowModal)
        setParent(parentWidget(), Qt::Sheet);
    else
        setParent(parentWidget(), Qt::Dialog);
    setDefaultButton(d_func()->defaultButton);
}

#ifdef QT3_SUPPORT
/*!
    \compat

    Constructs a message box with the given \a parent, \a name, and
    window flags, \a f.
    The window title is specified by \a title, and the message box
    displays message text and an icon specified by \a text and \a icon.

    The buttons that the user can access to respond to the message are
    defined by \a button0, \a button1, and \a button2.
*/
QMessageBox::QMessageBox(const QString& title,
                         const QString &text, Icon icon,
                         int button0, int button1, int button2,
                         QWidget *parent, const char *name,
                         bool modal, Qt::WindowFlags f)
    : QDialog(*new QMessageBoxPrivate, parent,
              f | Qt::WStyle_Customize | Qt::WStyle_DialogBorder | Qt::WStyle_Title | Qt::WStyle_SysMenu)
{
    Q_D(QMessageBox);
    setObjectName(QString::fromAscii(name));
    d->init(title, text);
    d->addOldButtons(button0, button1, button2);
    setModal(modal);
    setIcon(icon);
}

/*!
    \compat
    Constructs a message box with the given \a parent and \a name.
*/
QMessageBox::QMessageBox(QWidget *parent, const char *name)
    : QDialog(*new QMessageBoxPrivate, parent,
              Qt::WStyle_Customize | Qt::WStyle_DialogBorder | Qt::WStyle_Title | Qt::WStyle_SysMenu)
{
    Q_D(QMessageBox);
    setObjectName(QString::fromAscii(name));
    d->init();
}

/*!
  Returns the pixmap used for a standard icon. This
  allows the pixmaps to be used in more complex message boxes.
  \a icon specifies the required icon, e.g. QMessageBox::Information,
  QMessageBox::Warning or QMessageBox::Critical.

  \a style is unused.
*/

QPixmap QMessageBox::standardIcon(Icon icon, Qt::GUIStyle style)
{
    Q_UNUSED(style);
    return QMessageBox::standardIcon(icon);
}

/*!
    \fn int QMessageBox::message(const QString &title, const QString &text,
                                 const QString &buttonText, QWidget *parent = 0,
                                 const char *name = 0)

    Opens a modal message box with the given \a title and showing the
    given \a text. The message box has a single button which has the
    given \a buttonText (or tr("OK")). The message box is centred over
    its \a parent and is called \a name.

    Use information(), warning(), question(), or critical() instead.

    \oldcode
        QMessageBox::message(tr("My App"), tr("All occurrences replaced."),
                             tr("Close"), this);
    \newcode
        QMessageBox::information(this, tr("My App"),
                                 tr("All occurrences replaced."),
                                 QMessageBox::Close);
    \endcode
*/

/*!
    \fn bool QMessageBox::query(const QString &caption,
                                const QString& text,
                                const QString& yesButtonText,
                                const QString& noButtonText,
                                QWidget *parent, const char *name)

    \obsolete

    Queries the user using a modal message box with up to two buttons.
    The message box has the given \a caption (although some window
    managers don't show it), and shows the given \a text. The left
    button has the \a yesButtonText (or tr("OK")), and the right button
    has the \a noButtonText (or isn't shown). The message box is centred
    over its \a parent and is called \a name.

    Use information(), question(), warning(), or critical() instead.
*/

#endif

/*!
    \obsolete

    Returns the pixmap used for a standard icon. This allows the
    pixmaps to be used in more complex message boxes. \a icon
    specifies the required icon, e.g. QMessageBox::Question,
    QMessageBox::Information, QMessageBox::Warning or
    QMessageBox::Critical.

    Call QStyle::pixelMetric() with QStyle::SP_MessageBoxInformation etc.
    instead.
*/

QPixmap QMessageBox::standardIcon(Icon icon)
{
    int iconSize = QApplication::style()->pixelMetric(QStyle::PM_MessageBoxIconSize);
    QIcon tmpIcon;
    switch (icon) {
    case Information:
        tmpIcon = QApplication::style()->standardIcon(QStyle::SP_MessageBoxInformation);
        break;
    case Warning:
        tmpIcon = QApplication::style()->standardIcon(QStyle::SP_MessageBoxWarning);
        break;
    case Critical:
        tmpIcon = QApplication::style()->standardIcon(QStyle::SP_MessageBoxCritical);
        break;
    case Question:
        tmpIcon = QApplication::style()->standardIcon(QStyle::SP_MessageBoxQuestion);
    default:
        break;
    }
    if (!tmpIcon.isNull())
        return tmpIcon.pixmap(iconSize, iconSize);
    return QPixmap();
}

/*!
    \typedef QMessageBox::Button
    \obsolete

    Use QMessageBox::StandardButton instead.
*/

/*!
    \fn int QMessageBox::information(QWidget *parent, const QString &title,
                                     const QString& text, StandardButton button0,
                                     StandardButton button1)
    \fn int QMessageBox::warning(QWidget *parent, const QString &title,
                                 const QString& text, StandardButton button0,
                                 StandardButton button1)
    \fn int QMessageBox::critical(QWidget *parent, const QString &title,
                                  const QString& text, StandardButton button0,
                                  StandardButton button1)
    \fn int QMessageBox::question(QWidget *parent, const QString &title,
                                  const QString& text, StandardButton button0,
                                  StandardButton button1)
    \internal

    ### Needed for Qt 4 source compatibility
*/

/*!
    \macro QT_REQUIRE_VERSION(int argc, char **argv, const char *version)
    \relates QMessageBox

    This macro can be used to ensure that the application is run
    against a recent enough version of Qt. This is especially useful
    if your application depends on a specific bug fix introduced in a
    bug-fix release (e.g., 4.0.2).

    The \a argc and \a argv parameters are the \c main() function's
    \c argc and \c argv parameters. The \a version parameter is a
    string literal that specifies which version of Qt the application
    requires (e.g., "4.0.2").

    Example:

    \code
        #include <QApplication>
        #include <QMessageBox>

        int main(int argc, char *argv[])
        {
            QT_REQUIRE_VERSION(argc, argv, "4.0.2")

            QApplication app(argc, argv);
            ...
            return app.exec();
        }
    \endcode
*/

/*!
  \fn int QMessageBox::exec()

  Shows the message box as a \l{QDialog#Modal Dialogs}{modal dialog},
  blocking until the user closes it.

  When using a QMessageBox with standard buttons, this functions returns a
  \l StandardButton value indicating the standard button that was clicked.
  When using QMessageBox with custom buttons, this function returns an
  opaque value; use clickedButton() to determine which button was clicked.

  Users cannot interact with any other window in the same
  application until they close the dialog, either by clicking a
  button or by using a mechanism provided by the window system.

  \sa show(), result()
*/

#include "moc_qmessagebox.cpp"
#endif // QT_NO_MESSAGEBOX