qmessagebox.cpp

奇趣公司比较新的qt/emd版本

        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) {