qmessagebox.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include <QtWidgets/qmessagebox.h>
 
#include <QtWidgets/qdialogbuttonbox.h>
#include "private/qlabel_p.h"
#include "private/qapplication_p.h"
#include <QtCore/qlist.h>
#include <QtCore/qdebug.h>
#include <QtWidgets/qstyle.h>
#include <QtWidgets/qstyleoption.h>
#include <QtWidgets/qgridlayout.h>
#include <QtWidgets/qpushbutton.h>
#include <QtWidgets/qcheckbox.h>
#include <QtGui/qaccessible.h>
#include <QtGui/qicon.h>
#include <QtGui/qtextdocument.h>
#include <QtWidgets/qapplication.h>
#if QT_CONFIG(textedit)
#include <QtWidgets/qtextedit.h>
#endif
#if QT_CONFIG(menu)
#include <QtWidgets/qmenu.h>
#endif
#include "qdialog_p.h"
#include <QtGui/qfont.h>
#include <QtGui/qfontmetrics.h>
#include <QtGui/qclipboard.h>
#include "private/qabstractbutton_p.h"
#include <QtGui/qpa/qplatformtheme.h>
 
#include <QtCore/qanystringview.h>
#include <QtCore/qdebug.h>
#include <QtCore/qpointer.h>
#include <QtCore/qversionnumber.h>
 
#ifdef Q_OS_WIN
#    include <QtCore/qt_windows.h>
#include <qpa/qplatformnativeinterface.h>
#endif
 
#include <optional>
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
#if defined(Q_OS_WIN)
HMENU qt_getWindowsSystemMenu(const QWidget *w)
{
    if (QWindow *window = QApplicationPrivate::windowForWidget(w))
        if (void *handle = QGuiApplication::platformNativeInterface()->nativeResourceForWindow("handle", window))
            return GetSystemMenu(reinterpret_cast<HWND>(handle), false);
    return 0;
}
#endif
 
static_assert(qToUnderlying(QMessageBox::ButtonRole::NRoles) ==
              qToUnderlying(QDialogButtonBox::ButtonRole::NRoles),
              "QMessageBox::ButtonRole and QDialogButtonBox::ButtonRole out of sync!");
 
static_assert(std::is_same_v<std::underlying_type_t<QMessageBox::ButtonRole>,
                             std::underlying_type_t<QDialogButtonBox::ButtonRole>>);
 
// StandardButton enums have different underlying types
// => qToUnderlying and std::is_same_v won't work
// ### Qt 7: make them have the same underlying type
static_assert(static_cast<int>(QMessageBox::StandardButton::LastButton) ==
              static_cast<int>(QDialogButtonBox::StandardButton::LastButton),
              "QMessageBox::StandardButton and QDialogButtonBox::StandardButton out of sync!");
 
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,
              NewButtonMask = 0xFFFFFC00 };
 
enum DetailButtonLabel { ShowLabel = 0, HideLabel = 1 };
#if QT_CONFIG(textedit)
class QMessageBoxDetailsText : public QWidget
{
    Q_OBJECT
public:
    class TextEdit : public QTextEdit
    {
    public:
        TextEdit(QWidget *parent=nullptr) : QTextEdit(parent) { }
#ifndef QT_NO_CONTEXTMENU
        void contextMenuEvent(QContextMenuEvent * e) override
        {
            if (QMenu *menu = createStandardContextMenu()) {
                menu->setAttribute(Qt::WA_DeleteOnClose);
                menu->popup(e->globalPos());
            }
        }
#endif // QT_NO_CONTEXTMENU
    };
 
    QMessageBoxDetailsText(QWidget *parent=nullptr)
        : QWidget(parent)
        , copyAvailable(false)
    {
        QVBoxLayout *layout = new QVBoxLayout;
        layout->setContentsMargins(QMargins());
        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);
 
        connect(textEdit, &TextEdit::copyAvailable,
                this, &QMessageBoxDetailsText::textCopyAvailable);
    }
    void setText(const QString &text) { textEdit->setPlainText(text); }
    QString text() const { return textEdit->toPlainText(); }
 
    bool copy()
    {
#ifdef QT_NO_CLIPBOARD
        return false;
#else
        if (!copyAvailable)
            return false;
        textEdit->copy();
        return true;
#endif
    }
 
    void selectAll()
    {
        textEdit->selectAll();
    }
 
private slots:
    void textCopyAvailable(bool available)
    {
        copyAvailable = available;
    }
 
private:
    bool copyAvailable;
    TextEdit *textEdit;
};
#endif // QT_CONFIG(textedit)
 
class DetailButton : public QPushButton
{
public:
    DetailButton(QWidget *parent) : QPushButton(label(ShowLabel), parent)
    {
        setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    }
 
    QString label(DetailButtonLabel label) const
    { return label == ShowLabel ? QMessageBox::tr("Show Details...") : QMessageBox::tr("Hide Details..."); }
 
    void setLabel(DetailButtonLabel lbl)
    { setText(label(lbl)); }
 
    QSize sizeHint() const override
    {
        ensurePolished();
        QStyleOptionButton opt;
        initStyleOption(&opt);
        const QFontMetrics fm = fontMetrics();
        opt.text = label(ShowLabel);
        QSize sz = fm.size(Qt::TextShowMnemonic, opt.text);
        QSize ret = style()->sizeFromContents(QStyle::CT_PushButton, &opt, sz, this);
        opt.text = label(HideLabel);
        sz = fm.size(Qt::TextShowMnemonic, opt.text);
        ret = ret.expandedTo(style()->sizeFromContents(QStyle::CT_PushButton, &opt, sz, this));
        return ret;
    }
};
 
class QMessageBoxPrivate : public QDialogPrivate
{
    Q_DECLARE_PUBLIC(QMessageBox)
 
public:
    QMessageBoxPrivate() : escapeButton(nullptr), defaultButton(nullptr), checkbox(nullptr), clickedButton(nullptr), detailsButton(nullptr),
#if QT_CONFIG(textedit)
                           detailsText(nullptr),
#endif
                           compatMode(false), autoAddOkButton(true),
                           detectedEscapeButton(nullptr), informativeLabel(nullptr),
                           options(QMessageDialogOptions::create()) { }
 
    void init(const QString &title = QString(), const QString &text = QString());
    void setupLayout();
    void buttonClicked(QAbstractButton *);
    void helperClicked(QPlatformDialogHelper::StandardButton button, QPlatformDialogHelper::ButtonRole role);
    void setClickedButton(QAbstractButton *button);
 
    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();
 
    void setVisible(bool visible) override;
    bool canBeNativeDialog() const override;
 
    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);
 
    static QPixmap standardIcon(QMessageBox::Icon icon, QMessageBox *mb);
    static QMessageBox::StandardButton standardButtonForRole(QMessageBox::ButtonRole role);
 
    QLabel *label;
    QMessageBox::Icon icon;
    QLabel *iconLabel;
    QDialogButtonBox *buttonBox;
    QList<QAbstractButton *> customButtonList;
    QAbstractButton *escapeButton;
    QPushButton *defaultButton;
    QCheckBox *checkbox;
    QAbstractButton *clickedButton;
    DetailButton *detailsButton;
#if QT_CONFIG(textedit)
    QMessageBoxDetailsText *detailsText;
#endif
    bool compatMode;
    bool autoAddOkButton;
    QAbstractButton *detectedEscapeButton;
    QLabel *informativeLabel;
    QPointer<QObject> receiverToDisconnectOnClose;
    QByteArray memberToDisconnectOnClose;
    QByteArray signalToDisconnectOnClose;
    QSharedPointer<QMessageDialogOptions> options;
private:
    void initHelper(QPlatformDialogHelper *) override;
    void helperPrepareShow(QPlatformDialogHelper *) override;
    int dialogCode() const override;
};
 
void QMessageBoxPrivate::init(const QString &title, const QString &text)
{
    Q_Q(QMessageBox);
 
    label = new QLabel;
    label->setObjectName("qt_msgbox_label"_L1);
    label->setTextInteractionFlags(Qt::TextInteractionFlags(q->style()->styleHint(QStyle::SH_MessageBox_TextInteractionFlags, nullptr, q)));
    label->setAlignment(Qt::AlignVCenter | Qt::AlignLeft);
    label->setOpenExternalLinks(true);
    iconLabel = new QLabel(q);
    iconLabel->setObjectName("qt_msgboxex_icon_label"_L1);
    iconLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
 
    buttonBox = new QDialogButtonBox;
    buttonBox->setObjectName("qt_msgbox_buttonbox"_L1);
    buttonBox->setCenterButtons(q->style()->styleHint(QStyle::SH_MessageBox_CenterButtons, nullptr, q));
    QObjectPrivate::connect(buttonBox, &QDialogButtonBox::clicked,
                            this, &QMessageBoxPrivate::buttonClicked);
    setupLayout();
    if (!title.isEmpty() || !text.isEmpty()) {
        q->setWindowTitle(title);
        q->setText(text);
    }
    q->setModal(true);
#ifdef Q_OS_MAC
    QFont f = q->font();
    f.setBold(true);
    label->setFont(f);
#endif
    icon = QMessageBox::NoIcon;
}
 
void QMessageBoxPrivate::setupLayout()
{
    Q_Q(QMessageBox);
    delete q->layout();
    QGridLayout *grid = new QGridLayout;
    const bool hasIcon = !iconLabel->pixmap().isNull();
 
    if (hasIcon)
        grid->addWidget(iconLabel, 0, 0, 2, 1, Qt::AlignTop);
    iconLabel->setVisible(hasIcon);
#ifdef Q_OS_MAC
    QSpacerItem *indentSpacer = new QSpacerItem(14, 1, QSizePolicy::Fixed, QSizePolicy::Fixed);
#else
    QSpacerItem *indentSpacer = new QSpacerItem(hasIcon ? 7 : 15, 1, QSizePolicy::Fixed, QSizePolicy::Fixed);
#endif
    grid->addItem(indentSpacer, 0, hasIcon ? 1 : 0, 2, 1);
    grid->addWidget(label, 0, hasIcon ? 2 : 1, 1, 1);
    if (informativeLabel) {
#ifndef Q_OS_MAC
        informativeLabel->setContentsMargins(0, 7, 0, 7);
#endif
        grid->addWidget(informativeLabel, 1, hasIcon ? 2 : 1, 1, 1);
    }
    if (checkbox) {
        grid->addWidget(checkbox, informativeLabel ? 2 : 1, hasIcon ? 2 : 1, 1, 1, Qt::AlignLeft);
#ifdef Q_OS_MAC
        grid->addItem(new QSpacerItem(1, 15, QSizePolicy::Fixed, QSizePolicy::Fixed), grid->rowCount(), 0);
#else
        grid->addItem(new QSpacerItem(1, 7, QSizePolicy::Fixed, QSizePolicy::Fixed), grid->rowCount(), 0);
#endif
    }
#ifdef Q_OS_MAC
    grid->addWidget(buttonBox, grid->rowCount(), hasIcon ? 2 : 1, 1, 1);
    grid->setContentsMargins(0, 0, 0, 0);
    grid->setVerticalSpacing(8);
    grid->setHorizontalSpacing(0);
    q->setContentsMargins(24, 15, 24, 20);
    grid->setRowStretch(1, 100);
    grid->setRowMinimumHeight(2, 6);
#else
    grid->addWidget(buttonBox, grid->rowCount(), 0, 1, grid->columnCount());
#endif
#if QT_CONFIG(textedit)
    if (detailsText)
        grid->addWidget(detailsText, grid->rowCount(), 0, 1, grid->columnCount());
#endif
    grid->setSizeConstraint(QLayout::SetNoConstraint);
    q->setLayout(grid);
 
    retranslateStrings();
    updateSize();
}
 
int QMessageBoxPrivate::layoutMinimumWidth()
{
    layout->activate();
    return layout->totalMinimumSize().width();
}
 
void QMessageBoxPrivate::updateSize()
{
    Q_Q(QMessageBox);
 
    if (!q->isVisible())
        return;
 
    const QSize screenSize = q->screen()->availableGeometry().size();
    int hardLimit = qMin(screenSize.width() - 480, 1000); // can never get bigger than this
    // on small screens allows the messagebox be the same size as the screen
    if (screenSize.width() <= 1024)
        hardLimit = screenSize.width();
#ifdef Q_OS_MAC
    int softLimit = qMin(screenSize.width()/2, 420);
#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 (QWidgetTextControl *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);
        QSizePolicy policy(QSizePolicy::Minimum, QSizePolicy::Preferred);
        policy.setHeightForWidth(true);
        informativeLabel->setSizePolicy(policy);
        width = qMax(width, layoutMinimumWidth());
        if (width > hardLimit) { // longest word is really big, so wrap anywhere
            informativeLabel->d_func()->ensureTextControl();
            if (QWidgetTextControl *control = informativeLabel->d_func()->control) {
                QTextOption opt = control->document()->defaultTextOption();
                opt.setWrapMode(QTextOption::WrapAnywhere);
                control->document()->setDefaultTextOption(opt);
            }
            width = hardLimit;
        }
        policy.setHeightForWidth(label->wordWrap());
        label->setSizePolicy(policy);
    }
 
    QFontMetrics fm(QApplication::font("QMdiSubWindowTitleBar"));
    int windowTitleWidth = qMin(fm.horizontalAdvance(q->windowTitle()) + 50, hardLimit);
    if (windowTitleWidth > width)
        width = windowTitleWidth;
 
    layout->activate();
    int height = (layout->hasHeightForWidth())
                     ? layout->totalHeightForWidth(width)
                     : 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)
{
    if (int standardButton = buttonBox->standardButton(button)) {
        // When using a QMessageBox with standard buttons, the return
        // code is a StandardButton value indicating the standard button
        // that was clicked.
        if (compatMode)
            return oldButton(standardButton);
        else
            return standardButton;
    } else {
        // When using QMessageBox with custom buttons, the return code
        // is an opaque value, and the user is expected to use clickedButton()
        // to determine which button was clicked. We make sure to keep the opaque
        // value out of the QDialog::DialogCode range, so we can distinguish them.
        auto customButtonIndex = customButtonList.indexOf(button);
        if (customButtonIndex >= 0)
            return QDialog::DialogCode::Accepted + customButtonIndex + 1;
        else
            return customButtonIndex; // Not found, return -1
    }
}
 
int QMessageBoxPrivate::dialogCode() const
{
    Q_Q(const QMessageBox);
 
    if (rescode <= QDialog::Accepted) {
        return rescode;
    } else if (clickedButton) {
        switch (q->buttonRole(clickedButton)) {
        case QMessageBox::AcceptRole:
        case QMessageBox::YesRole:
            return QDialog::Accepted;
        case QMessageBox::RejectRole:
        case QMessageBox::NoRole:
            return QDialog::Rejected;
        default:
            ;
        }
    }
 
    return QDialogPrivate::dialogCode();
}
 
void QMessageBoxPrivate::buttonClicked(QAbstractButton *button)
{
    Q_Q(QMessageBox);
#if QT_CONFIG(textedit)
    if (detailsButton && detailsText && button == detailsButton) {
        detailsButton->setLabel(detailsText->isHidden() ? HideLabel : ShowLabel);
        detailsText->setHidden(!detailsText->isHidden());
        updateSize();
    } else
#endif
    {
        setClickedButton(button);
 
        if (receiverToDisconnectOnClose) {
            QObject::disconnect(q, signalToDisconnectOnClose, receiverToDisconnectOnClose,
                                memberToDisconnectOnClose);
            receiverToDisconnectOnClose = nullptr;
        }
        signalToDisconnectOnClose.clear();
        memberToDisconnectOnClose.clear();
    }
}
 
void QMessageBoxPrivate::setClickedButton(QAbstractButton *button)
{
    Q_Q(QMessageBox);
 
    clickedButton = button;
    emit q->buttonClicked(clickedButton);
 
    auto resultCode = execReturnCode(button);
    q->done(resultCode);
}
 
void QMessageBoxPrivate::helperClicked(QPlatformDialogHelper::StandardButton helperButton, QPlatformDialogHelper::ButtonRole role)
{
    Q_UNUSED(role);
    Q_Q(QMessageBox);
 
    // Map back to QAbstractButton, so that the message box behaves the same from
    // the outside, regardless of whether it's backed by a native helper or not.
    QAbstractButton *dialogButton = helperButton > QPlatformDialogHelper::LastButton ?
        static_cast<QAbstractButton *>(options->customButton(helperButton)->button) :
        q->button(QMessageBox::StandardButton(helperButton));
 
    Q_ASSERT(dialogButton);
 
    // Simulate click by explicitly clicking the button. This will ensure that
    // any logic of the button that responds to the click is respected, including
    // plumbing back to buttonClicked above based on the clicked() signal.
    dialogButton->click();
}
 
QMessageBox::QMessageBox(QWidget *parent)
    : QDialog(*new QMessageBoxPrivate, parent, Qt::MSWindowsFixedSizeDialogHint | Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowCloseButtonHint)
{
    Q_D(QMessageBox);
    d->init();
}
 
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 | Qt::WindowCloseButtonHint)
{
    Q_D(QMessageBox);
    d->init(title, text);
    setIcon(icon);
    if (buttons != NoButton)
        setStandardButtons(buttons);
}
 
QMessageBox::~QMessageBox()
{
}
 
void QMessageBox::addButton(QAbstractButton *button, ButtonRole role)
{
    Q_D(QMessageBox);
    if (!button)
        return;
    removeButton(button);
 
    if (button->text().isEmpty()) {
        if (auto *platformTheme = QGuiApplicationPrivate::platformTheme()) {
            if (auto standardButton = QMessageBoxPrivate::standardButtonForRole(role))
                button->setText(platformTheme->standardButtonText(standardButton));
        }
 
        if (button->text().isEmpty()) {
            qWarning() << "Cannot add" << button << "without title";
            return;
        }
    }
 
    d->buttonBox->addButton(button, (QDialogButtonBox::ButtonRole)role);
    d->customButtonList.append(button);
    d->autoAddOkButton = false;
}
 
QMessageBox::StandardButton QMessageBoxPrivate::standardButtonForRole(QMessageBox::ButtonRole role)
{
    switch (role) {
    case QMessageBox::AcceptRole: return QMessageBox::Ok;
    case QMessageBox::RejectRole: return QMessageBox::Cancel;
    case QMessageBox::DestructiveRole: return QMessageBox::Discard;
    case QMessageBox::HelpRole: return QMessageBox::Help;
    case QMessageBox::ApplyRole: return QMessageBox::Apply;
    case QMessageBox::YesRole: return QMessageBox::Yes;
    case QMessageBox::NoRole: return QMessageBox::No;
    case QMessageBox::ResetRole: return QMessageBox::Reset;
    default: return QMessageBox::NoButton;
    }
}
 
QPushButton *QMessageBox::addButton(const QString& text, ButtonRole role)
{
    Q_D(QMessageBox);
    QPushButton *pushButton = new QPushButton(text);
    addButton(pushButton, role);
    d->updateSize();
    return pushButton;
}
 
QPushButton *QMessageBox::addButton(StandardButton button)
{
    Q_D(QMessageBox);
    QPushButton *pushButton = d->buttonBox->addButton((QDialogButtonBox::StandardButton)button);
    if (pushButton)
        d->autoAddOkButton = false;
    return pushButton;
}
 
void QMessageBox::removeButton(QAbstractButton *button)
{
    Q_D(QMessageBox);
    d->customButtonList.removeAll(button);
    if (d->escapeButton == button)
        d->escapeButton = nullptr;
    if (d->defaultButton == button)
        d->defaultButton = nullptr;
    d->buttonBox->removeButton(button);
    d->updateSize();
}
 
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 = nullptr;
    if (!buttonList.contains(d->defaultButton))
        d->defaultButton = nullptr;
    d->autoAddOkButton = false;
    d->updateSize();
}
 
QMessageBox::StandardButtons QMessageBox::standardButtons() const
{
    Q_D(const QMessageBox);
    return QMessageBox::StandardButtons(int(d->buttonBox->standardButtons()));
}
 
QMessageBox::StandardButton QMessageBox::standardButton(QAbstractButton *button) const
{
    Q_D(const QMessageBox);
    return (QMessageBox::StandardButton)d->buttonBox->standardButton(button);
}
 
QAbstractButton *QMessageBox::button(StandardButton which) const
{
    Q_D(const QMessageBox);
    return d->buttonBox->button(QDialogButtonBox::StandardButton(which));
}
 
QAbstractButton *QMessageBox::escapeButton() const
{
    Q_D(const QMessageBox);
    return d->escapeButton;
}
 
void QMessageBox::setEscapeButton(QAbstractButton *button)
{
    Q_D(QMessageBox);
    if (d->buttonBox->buttons().contains(button))
        d->escapeButton = button;
}
 
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.size() == 1) {
        detectedEscapeButton = buttons.first();
        return;
    }
 
    // If there are two buttons and one of them is the "Show Details..."
    // button, then make the other one the escape button
    if (buttons.size() == 2 && detailsButton) {
        auto idx = buttons.indexOf(detailsButton);
        if (idx != -1) {
            detectedEscapeButton = buttons.at(1 - idx);
            return;
        }
    }
 
    // if the message box has one RejectRole button, make it the escape button
    for (auto *button : buttons) {
        if (buttonBox->buttonRole(button) == QDialogButtonBox::RejectRole) {
            if (detectedEscapeButton) { // already detected!
                detectedEscapeButton = nullptr;
                break;
            }
            detectedEscapeButton = button;
        }
    }
    if (detectedEscapeButton)
        return;
 
    // if the message box has one NoRole button, make it the escape button
    for (auto *button : buttons) {
        if (buttonBox->buttonRole(button) == QDialogButtonBox::NoRole) {
            if (detectedEscapeButton) { // already detected!
                detectedEscapeButton = nullptr;
                break;
            }
            detectedEscapeButton = button;
        }
    }
}
 
QAbstractButton *QMessageBox::clickedButton() const
{
    Q_D(const QMessageBox);
    return d->clickedButton;
}
 
QPushButton *QMessageBox::defaultButton() const
{
    Q_D(const QMessageBox);
    return d->defaultButton;
}
 
void QMessageBox::setDefaultButton(QPushButton *button)
{
    Q_D(QMessageBox);
    if (!d->buttonBox->buttons().contains(button))
        return;
    d->defaultButton = button;
    button->setDefault(true);
    button->setFocus();
}
 
void QMessageBox::setDefaultButton(QMessageBox::StandardButton button)
{
    Q_D(QMessageBox);
    setDefaultButton(d->buttonBox->button(QDialogButtonBox::StandardButton(button)));
}
 
void QMessageBox::setCheckBox(QCheckBox *cb)
{
    Q_D(QMessageBox);
 
    if (cb == d->checkbox)
        return;
 
    if (d->checkbox) {
        d->checkbox->hide();
        layout()->removeWidget(d->checkbox);
        if (d->checkbox->parentWidget() == this) {
            d->checkbox->setParent(nullptr);
            d->checkbox->deleteLater();
        }
    }
    d->checkbox = cb;
    if (d->checkbox) {
        QSizePolicy sp = d->checkbox->sizePolicy();
        sp.setHorizontalPolicy(QSizePolicy::MinimumExpanding);
        d->checkbox->setSizePolicy(sp);
    }
    d->setupLayout();
}
 
 
QCheckBox* QMessageBox::checkBox() const
{
    Q_D(const QMessageBox);
    return d->checkbox;
}
 
void QMessageBox::setOption(QMessageBox::Option option, bool on)
{
    const QMessageBox::Options previousOptions = options();
    if (!(previousOptions & option) != !on)
        setOptions(previousOptions ^ option);
}
 
bool QMessageBox::testOption(QMessageBox::Option option) const
{
    Q_D(const QMessageBox);
    return d->options->testOption(static_cast<QMessageDialogOptions::Option>(option));
}
 
void QMessageBox::setOptions(QMessageBox::Options options)
{
    Q_D(QMessageBox);
 
    if (QMessageBox::options() == options)
        return;
 
    d->options->setOptions(QMessageDialogOptions::Option(int(options)));
}
 
QMessageBox::Options QMessageBox::options() const
{
    Q_D(const QMessageBox);
    return QMessageBox::Options(int(d->options->options()));
}
 
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();
}
 
QMessageBox::Icon QMessageBox::icon() const
{
    Q_D(const QMessageBox);
    return d->icon;
}
 
void QMessageBox::setIcon(Icon icon)
{
    Q_D(QMessageBox);
    setIconPixmap(QMessageBoxPrivate::standardIcon((QMessageBox::Icon)icon,
                                                   this));
    d->icon = 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->icon = NoIcon;
    d->setupLayout();
}
 
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())));
    if (d->informativeLabel)
        d->informativeLabel->setTextFormat(format);
    d->updateSize();
}
 
Qt::TextInteractionFlags QMessageBox::textInteractionFlags() const
{
    Q_D(const QMessageBox);
    return d->label->textInteractionFlags();
}
 
void QMessageBox::setTextInteractionFlags(Qt::TextInteractionFlags flags)
{
    Q_D(QMessageBox);
    d->label->setTextInteractionFlags(flags);
}
 
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;
}
 
void QMessageBox::resizeEvent(QResizeEvent *event)
{
    QDialog::resizeEvent(event);
}
 
void QMessageBox::closeEvent(QCloseEvent *e)
{
    Q_D(QMessageBox);
    if (!d->detectedEscapeButton) {
        e->ignore();
        return;
    }
    QDialog::closeEvent(e);
    if (!d->clickedButton) {
        d->clickedButton = d->detectedEscapeButton;
        setResult(d->execReturnCode(d->detectedEscapeButton));
    }
}
 
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, nullptr, this));
        d->label->setTextInteractionFlags(flags);
        d->buttonBox->setCenterButtons(style()->styleHint(QStyle::SH_MessageBox_CenterButtons, nullptr, this));
        if (d->informativeLabel)
            d->informativeLabel->setTextInteractionFlags(flags);
        Q_FALLTHROUGH();
    }
    case QEvent::FontChange:
    case QEvent::ApplicationFontChange:
#ifdef Q_OS_MAC
    {
        QFont f = font();
        f.setBold(true);
        d->label->setFont(f);
    }
#endif
        Q_FALLTHROUGH();
    default:
        break;
    }
    QDialog::changeEvent(ev);
}
 
void QMessageBox::keyPressEvent(QKeyEvent *e)
{
#if QT_CONFIG(shortcut)
        Q_D(QMessageBox);
        if (e->matches(QKeySequence::Cancel)) {
            if (d->detectedEscapeButton) {
#ifdef Q_OS_MAC
                d->detectedEscapeButton->animateClick();
#else
                d->detectedEscapeButton->click();
#endif
            }
            return;
        }
#endif // QT_CONFIG(shortcut)
 
#if !defined(QT_NO_CLIPBOARD) && !defined(QT_NO_SHORTCUT)
 
#if QT_CONFIG(textedit)
        if (e == QKeySequence::Copy) {
            if (d->detailsText && d->detailsText->isVisible() && d->detailsText->copy()) {
                e->setAccepted(true);
                return;
            }
        } else if (e == QKeySequence::SelectAll && d->detailsText && d->detailsText->isVisible()) {
            d->detailsText->selectAll();
            e->setAccepted(true);
            return;
        }
#endif // QT_CONFIG(textedit)
 
#if defined(Q_OS_WIN)
        if (e == QKeySequence::Copy) {
            const auto separator = "---------------------------\n"_L1;
            QString textToCopy;
            textToCopy += separator + windowTitle() + u'\n' + separator // title
                          + d->label->text() + u'\n' + separator;       // text
 
            if (d->informativeLabel)
                textToCopy += d->informativeLabel->text() + u'\n' + separator;
 
            const QList<QAbstractButton *> buttons = d->buttonBox->buttons();
            for (const auto *button : buttons)
                textToCopy += button->text() + "   "_L1;
            textToCopy += u'\n' + separator;
#if QT_CONFIG(textedit)
            if (d->detailsText)
                textToCopy += d->detailsText->text() + u'\n' + separator;
#endif
            QGuiApplication::clipboard()->setText(textToCopy);
            return;
        }
#endif // Q_OS_WIN
 
#endif // !QT_NO_CLIPBOARD && !QT_NO_SHORTCUT
 
#ifndef QT_NO_SHORTCUT
    if (!(e->modifiers() & (Qt::AltModifier | Qt::ControlModifier | Qt::MetaModifier))) {
        int key = e->key() & ~Qt::MODIFIER_MASK;
        if (key) {
            const QList<QAbstractButton *> buttons = d->buttonBox->buttons();
            for (auto *pb : buttons) {
                QKeySequence shortcut = pb->shortcut();
                if (!shortcut.isEmpty() && key == shortcut[0].key()) {
                    pb->animateClick();
                    return;
                }
            }
        }
    }
#endif
    QDialog::keyPressEvent(e);
}
 
void QMessageBox::open(QObject *receiver, const char *member)
{
    Q_D(QMessageBox);
    const char *signal = member && strchr(member, '*') ? SIGNAL(buttonClicked(QAbstractButton*))
                                                       : SIGNAL(finished(int));
    connect(this, signal, receiver, member);
    d->signalToDisconnectOnClose = signal;
    d->receiverToDisconnectOnClose = receiver;
    d->memberToDisconnectOnClose = member;
    QDialog::open();
}
 
void QMessageBoxPrivate::setVisible(bool visible)
{
    Q_Q(QMessageBox);
 
    // Last minute setup
    if (autoAddOkButton)
        q->addButton(QMessageBox::Ok);
    detectEscapeButton();
 
    if (canBeNativeDialog())
        setNativeDialogVisible(visible);
 
    // Update WA_DontShowOnScreen based on whether the native dialog was shown,
    // so that QDialog::setVisible(visible) below updates the QWidget state correctly,
    // but skips showing the non-native version.
    q->setAttribute(Qt::WA_DontShowOnScreen, nativeDialogInUse);
 
    QDialogPrivate::setVisible(visible);
}
 
QList<QAbstractButton *> QMessageBox::buttons() const
{
    Q_D(const QMessageBox);
    return d->buttonBox->buttons();
}
 
QMessageBox::ButtonRole QMessageBox::buttonRole(QAbstractButton *button) const
{
    Q_D(const QMessageBox);
    return QMessageBox::ButtonRole(d->buttonBox->buttonRole(button));
}
 
void QMessageBox::showEvent(QShowEvent *e)
{
    Q_D(QMessageBox);
    d->clickedButton = nullptr;
    d->updateSize();
 
#if QT_CONFIG(accessibility)
    QAccessibleEvent event(this, QAccessible::Alert);
    QAccessible::updateAccessibility(&event);
#endif
#if defined(Q_OS_WIN)
    if (const HMENU systemMenu = qt_getWindowsSystemMenu(this)) {
        EnableMenuItem(systemMenu, SC_CLOSE, d->detectedEscapeButton ?
                       MF_BYCOMMAND|MF_ENABLED : MF_BYCOMMAND|MF_GRAYED);
    }
#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)) {
        const int defaultButtons = defaultButton | QMessageBox::Default;
        const int otherButtons = buttons.toInt();
        const int ret = QMessageBoxPrivate::showOldMessageBox(parent, icon, title,
                                                              text, otherButtons,
                                                              defaultButtons, 0);
        return static_cast<QMessageBox::StandardButton>(ret);
    }
 
    QMessageBox msgBox(icon, title, text, QMessageBox::NoButton, parent);
    QDialogButtonBox *buttonBox = msgBox.findChild<QDialogButtonBox*>();
    Q_ASSERT(buttonBox != nullptr);
 
    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());
}
 
QMessageBox::StandardButton QMessageBox::information(QWidget *parent, const QString &title,
                               const QString& text, StandardButtons buttons,
                               StandardButton defaultButton)
{
    return showNewMessageBox(parent, Information, title, text, buttons,
                             defaultButton);
}
 
 
QMessageBox::StandardButton QMessageBox::question(QWidget *parent, const QString &title,
                            const QString& text, StandardButtons buttons,
                            StandardButton defaultButton)
{
    return showNewMessageBox(parent, Question, title, text, buttons, defaultButton);
}
 
QMessageBox::StandardButton QMessageBox::warning(QWidget *parent, const QString &title,
                        const QString& text, StandardButtons buttons,
                        StandardButton defaultButton)
{
    return showNewMessageBox(parent, Warning, title, text, buttons, defaultButton);
}
 
QMessageBox::StandardButton QMessageBox::critical(QWidget *parent, const QString &title,
                         const QString& text, StandardButtons buttons,
                         StandardButton defaultButton)
{
    return showNewMessageBox(parent, Critical, title, text, buttons, defaultButton);
}
 
void QMessageBox::about(QWidget *parent, const QString &title, const QString &text)
{
#ifdef Q_OS_MAC
    static QPointer<QMessageBox> oldMsgBox;
 
    if (oldMsgBox && oldMsgBox->text() == text) {
        oldMsgBox->show();
        oldMsgBox->raise();
        oldMsgBox->activateWindow();
        return;
    }
#endif
 
    QMessageBox *msgBox = new QMessageBox(Information, title, text, NoButton, parent
#ifdef Q_OS_MAC
                                          , Qt::WindowTitleHint | Qt::WindowSystemMenuHint
#endif
    );
    msgBox->setAttribute(Qt::WA_DeleteOnClose);
    QIcon icon = msgBox->windowIcon();
    QSize size = icon.actualSize(QSize(64, 64));
    msgBox->setIconPixmap(icon.pixmap(size));
 
    // should perhaps be a style hint
#ifdef Q_OS_MAC
    oldMsgBox = msgBox;
    auto *d = msgBox->d_func();
    d->buttonBox->setCenterButtons(true);
#ifdef Q_OS_IOS
    msgBox->setModal(true);
#else
    msgBox->setModal(false);
#endif
    msgBox->show();
#else
    msgBox->exec();
#endif
}
 
void QMessageBox::aboutQt(QWidget *parent, const QString &title)
{
#ifdef Q_OS_MAC
    static QPointer<QMessageBox> oldMsgBox;
 
    if (oldMsgBox) {
        oldMsgBox->show();
        oldMsgBox->raise();
        oldMsgBox->activateWindow();
        return;
    }
#endif
 
    QString translatedTextAboutQtCaption;
    translatedTextAboutQtCaption = QMessageBox::tr(
        "<h3>About Qt</h3>"
        "<p>This program uses Qt version %1.</p>"
        ).arg(QT_VERSION_STR ""_L1);
    //: Leave this text untranslated or include a verbatim copy of it below
    //: and note that it is the authoritative version in case of doubt.
    const QString translatedTextAboutQtText = QMessageBox::tr(
        "<p>Qt is a C++ toolkit for cross-platform application "
        "development.</p>"
        "<p>Qt provides single-source portability across all major desktop "
        "operating systems. It is also available for embedded Linux and other "
        "embedded and mobile operating systems.</p>"
        "<p>Qt is available under multiple licensing options designed "
        "to accommodate the needs of our various users.</p>"
        "<p>Qt licensed under our commercial license agreement is appropriate "
        "for development of proprietary/commercial software where you do not "
        "want to share any source code with third parties or otherwise cannot "
        "comply with the terms of GNU (L)GPL.</p>"
        "<p>Qt licensed under GNU (L)GPL is appropriate for the "
        "development of Qt&nbsp;applications provided you can comply with the terms "
        "and conditions of the respective licenses.</p>"
        "<p>Please see <a href=\"https://%2/\">%2</a> "
        "for an overview of Qt licensing.</p>"
        "<p>Copyright (C) The Qt Company Ltd. and other "
        "contributors.</p>"
        "<p>Qt and the Qt logo are trademarks of The Qt Company Ltd.</p>"
        "<p>Qt is The Qt Company Ltd. product developed as an open source "
        "project. See <a href=\"https://%3/\">%3</a> for more information.</p>"
        ).arg(QStringLiteral("qt.io/licensing"),
              QStringLiteral("qt.io"));
    QMessageBox *msgBox = new QMessageBox(parent);
    msgBox->setAttribute(Qt::WA_DeleteOnClose);
    msgBox->setWindowTitle(title.isEmpty() ? tr("About Qt") : title);
    msgBox->setText(translatedTextAboutQtCaption);
    msgBox->setInformativeText(translatedTextAboutQtText);
 
    QPixmap pm(":/qt-project.org/qmessagebox/images/qtlogo-64.png"_L1);
    if (!pm.isNull())
        msgBox->setIconPixmap(pm);
 
    // should perhaps be a style hint
#ifdef Q_OS_MAC
    oldMsgBox = msgBox;
    auto *d = msgBox->d_func();
    d->buttonBox->setCenterButtons(true);
#ifdef Q_OS_IOS
    msgBox->setModal(true);
#else
    msgBox->setModal(false);
#endif
    msgBox->show();
#else
    msgBox->exec();
#endif
}
 
// 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 & NewButtonMask))
        return QMessageBox::StandardButton(button & QMessageBox::ButtonMask);
 
    return QMessageBox::NoButton;
}
 
static bool detectedCompat(int button0, int button1, int button2)
{
    if (button0 != 0 && !(button0 & NewButtonMask))
        return true;
    if (button1 != 0 && !(button1 & NewButtonMask))
        return true;
    if (button2 != 0 && !(button2 & NewButtonMask))
        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 nullptr;
    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()
{
#if QT_CONFIG(textedit)
    if (detailsButton && detailsText)
        detailsButton->setLabel(detailsText->isHidden() ? ShowLabel : HideLabel);
#endif
}
 
#if QT_DEPRECATED_SINCE(6,2)
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 | Qt::WindowCloseButtonHint)
{
    Q_D(QMessageBox);
    d->init(title, text);
    setIcon(icon);
    d->addOldButtons(button0, button1, button2);
}
 
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);
}
 
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);
}
 
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);
}
 
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);
}
 
 
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);
}
 
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);
}
 
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);
}
 
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);
}
 
 
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();
}
 
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);
    }
}
#endif // QT_DEPRECATED_SINCE(6,2)
 
 
#if QT_CONFIG(textedit)
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()) {
        if (d->detailsText) {
            d->detailsText->hide();
            d->detailsText->deleteLater();
        }
        d->detailsText = nullptr;
        removeButton(d->detailsButton);
        if (d->detailsButton) {
            d->detailsButton->hide();
            d->detailsButton->deleteLater();
        }
        d->detailsButton = nullptr;
    } else {
        if (!d->detailsText) {
            d->detailsText = new QMessageBoxDetailsText(this);
            d->detailsText->hide();
        }
        if (!d->detailsButton) {
            const bool autoAddOkButton = d->autoAddOkButton; // QTBUG-39334, addButton() clears the flag.
            d->detailsButton = new DetailButton(this);
            addButton(d->detailsButton, QMessageBox::ActionRole);
            d->autoAddOkButton = autoAddOkButton;
        }
        d->detailsText->setText(text);
    }
    d->setupLayout();
}
#endif // QT_CONFIG(textedit)
 
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()) {
        if (d->informativeLabel) {
            d->informativeLabel->hide();
            d->informativeLabel->deleteLater();
        }
        d->informativeLabel = nullptr;
    } else {
        if (!d->informativeLabel) {
            QLabel *label = new QLabel;
            label->setObjectName("qt_msgbox_informativelabel"_L1);
            label->setTextInteractionFlags(Qt::TextInteractionFlags(style()->styleHint(QStyle::SH_MessageBox_TextInteractionFlags, nullptr, this)));
            label->setAlignment(Qt::AlignTop | Qt::AlignLeft);
            label->setOpenExternalLinks(true);
#ifdef Q_OS_MAC
            // apply a smaller font the information label on the mac
            label->setFont(qt_app_fonts_hash()->value("QTipLabel"));
#endif
            label->setWordWrap(true);
            label->setTextFormat(d->label->textFormat());
            d->informativeLabel = label;
        }
        d->informativeLabel->setText(text);
    }
    d->setupLayout();
}
 
void QMessageBox::setWindowTitle(const QString &title)
{
    // Message boxes on the mac do not have a title
#ifndef Q_OS_MAC
    QDialog::setWindowTitle(title);
#else
    Q_UNUSED(title);
#endif
}
 
 
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);
}
 
 
QPixmap QMessageBoxPrivate::standardIcon(QMessageBox::Icon icon, QMessageBox *mb)
{
    QStyle *style = mb ? mb->style() : QApplication::style();
    int iconSize = style->pixelMetric(QStyle::PM_MessageBoxIconSize, nullptr, mb);
    QIcon tmpIcon;
    switch (icon) {
    case QMessageBox::Information:
        tmpIcon = style->standardIcon(QStyle::SP_MessageBoxInformation, nullptr, mb);
        break;
    case QMessageBox::Warning:
        tmpIcon = style->standardIcon(QStyle::SP_MessageBoxWarning, nullptr, mb);
        break;
    case QMessageBox::Critical:
        tmpIcon = style->standardIcon(QStyle::SP_MessageBoxCritical, nullptr, mb);
        break;
    case QMessageBox::Question:
        tmpIcon = style->standardIcon(QStyle::SP_MessageBoxQuestion, nullptr, mb);
        break;
    default:
        break;
    }
    if (!tmpIcon.isNull()) {
        qreal dpr = mb ? mb->devicePixelRatio() : qApp->devicePixelRatio();
        return tmpIcon.pixmap(QSize(iconSize, iconSize), dpr);
    }
    return QPixmap();
}
 
void QMessageBoxPrivate::initHelper(QPlatformDialogHelper *h)
{
    auto *messageDialogHelper = static_cast<QPlatformMessageDialogHelper *>(h);
    QObjectPrivate::connect(messageDialogHelper, &QPlatformMessageDialogHelper::clicked,
                            this, &QMessageBoxPrivate::helperClicked);
    // Forward state via lambda, so that we can handle addition and removal
    // of checkbox via setCheckBox() after initializing helper.
    QObject::connect(messageDialogHelper, &QPlatformMessageDialogHelper::checkBoxStateChanged,
        q_ptr, [this](Qt::CheckState state) {
            if (checkbox)
                checkbox->setCheckState(state);
        }
    );
    messageDialogHelper->setOptions(options);
}
 
static QMessageDialogOptions::StandardIcon helperIcon(QMessageBox::Icon i)
{
    switch (i) {
    case QMessageBox::NoIcon:
        return QMessageDialogOptions::NoIcon;
    case QMessageBox::Information:
        return QMessageDialogOptions::Information;
    case QMessageBox::Warning:
        return QMessageDialogOptions::Warning;
    case QMessageBox::Critical:
        return QMessageDialogOptions::Critical;
    case QMessageBox::Question:
        return QMessageDialogOptions::Question;
    }
    return QMessageDialogOptions::NoIcon;
}
 
static QPlatformDialogHelper::StandardButtons helperStandardButtons(QMessageBox * q)
{
    QPlatformDialogHelper::StandardButtons buttons(int(q->standardButtons()));
    return buttons;
}
 
bool QMessageBoxPrivate::canBeNativeDialog() const
{
    // Don't use Q_Q here! This function is called from ~QDialog,
    // so Q_Q calling q_func() invokes undefined behavior (invalid cast in q_func()).
    const QDialog * const q = static_cast<const QMessageBox*>(q_ptr);
    if (nativeDialogInUse)
        return true;
    if (QCoreApplication::testAttribute(Qt::AA_DontUseNativeDialogs)
        || q->testAttribute(Qt::WA_DontShowOnScreen)
        || q->testAttribute(Qt::WA_StyleSheet)
        || (options->options() & QMessageDialogOptions::Option::DontUseNativeDialog)) {
        return false;
    }
 
    if (strcmp(QMessageBox::staticMetaObject.className(), q->metaObject()->className()) != 0)
        return false;
 
#if QT_CONFIG(menu)
    for (auto *customButton : buttonBox->buttons()) {
        if (QPushButton *pushButton = qobject_cast<QPushButton *>(customButton)) {
            // We can't support buttons with menus in native dialogs (yet)
            if (pushButton->menu())
                return false;
        }
    }
#endif
 
    return QDialogPrivate::canBeNativeDialog();
}
 
void QMessageBoxPrivate::helperPrepareShow(QPlatformDialogHelper *)
{
    Q_Q(QMessageBox);
    options->setWindowTitle(q->windowTitle());
    options->setText(q->text());
    options->setInformativeText(q->informativeText());
#if QT_CONFIG(textedit)
    options->setDetailedText(q->detailedText());
#endif
    options->setStandardIcon(helperIcon(q->icon()));
    options->setIconPixmap(q->iconPixmap());
 
    // Clear up front, since we might have prepared earlier
    options->clearCustomButtons();
 
    // Add standard buttons and resolve default/escape button
    auto standardButtons = helperStandardButtons(q);
    for (int button = QDialogButtonBox::StandardButton::FirstButton;
             button <= QDialogButtonBox::StandardButton::LastButton; button <<= 1) {
        auto *standardButton = buttonBox->button(QDialogButtonBox::StandardButton(button));
        if (!standardButton)
            continue;
 
        if (auto *platformTheme = QGuiApplicationPrivate::platformTheme()) {
            if (standardButton->text() != platformTheme->standardButtonText(button)) {
                // The standard button has been customized, so add it as
                // a custom button instead.
                const auto buttonRole = buttonBox->buttonRole(standardButton);
                options->addButton(standardButton->text(),
                    static_cast<QPlatformDialogHelper::ButtonRole>(buttonRole),
                    standardButton, button);
                standardButtons &= ~QPlatformDialogHelper::StandardButton(button);
            }
        }
 
        if (standardButton == defaultButton)
            options->setDefaultButton(button);
        else if (standardButton == detectedEscapeButton)
            options->setEscapeButton(button);
    }
    options->setStandardButtons(standardButtons);
 
    // Add custom buttons and resolve default/escape button
    for (auto *customButton : customButtonList) {
        // Unless it's the details button, since we don't do any
        // plumbing for the button's action in that case.
        if (customButton == detailsButton)
            continue;
 
        const auto buttonRole = buttonBox->buttonRole(customButton);
        const int buttonId = options->addButton(customButton->text(),
            static_cast<QPlatformDialogHelper::ButtonRole>(buttonRole),
            customButton);
 
        if (customButton == defaultButton)
            options->setDefaultButton(buttonId);
        else if (customButton == detectedEscapeButton)
            options->setEscapeButton(buttonId);
    }
 
    if (checkbox)
        options->setCheckBox(checkbox->text(), checkbox->checkState());
}
 
void qRequireVersion(int argc, char *argv[], QAnyStringView req)
{
    const auto required = QVersionNumber::fromString(req).normalized();
    const auto current = QVersionNumber::fromString(qVersion()).normalized();
    if (current >= required)
        return;
    std::optional<QApplication> application;
    if (!qApp)
        application.emplace(argc, argv);
    const QString message = QApplication::tr("Application \"%1\" requires Qt %2, found Qt %3.")
                                    .arg(qAppName(), required.toString(), current.toString());
    QMessageBox::critical(nullptr, QApplication::tr("Incompatible Qt Library Error"),
                          message, QMessageBox::Abort);
    qFatal("%ls", qUtf16Printable(message));
}
 
#if QT_DEPRECATED_SINCE(6,2)
QPixmap QMessageBox::standardIcon(Icon icon)
{
    return QMessageBoxPrivate::standardIcon(icon, nullptr);
}
#endif
 
QT_END_NAMESPACE
 
#include "moc_qmessagebox.cpp"
#include "qmessagebox.moc"