qapplication.cpp

奇趣公司比较新的qt/emd版本

{
    QApplicationPrivate::setPalette_helper(palette, className, /*clearWidgetPaletteHash=*/ true);
}



void QApplicationPrivate::setSystemPalette(const QPalette &pal)
{
    QPalette adjusted;

#if 0
    // adjust the system palette to avoid dithering
    QColormap cmap = QColormap::instance();
    if (cmap.depths() > 4 && cmap.depths() < 24) {
        for (int g = 0; g < QPalette::NColorGroups; g++)
            for (int i = 0; i < QPalette::NColorRoles; i++) {
                QColor color = pal.color((QPalette::ColorGroup)g, (QPalette::ColorRole)i);
                color = cmap.colorAt(cmap.pixel(color));
                adjusted.setColor((QPalette::ColorGroup)g, (QPalette::ColorRole) i, color);
            }
    }
#else
    adjusted = pal;
#endif

    if (!sys_pal)
        sys_pal = new QPalette(adjusted);
    else
        *sys_pal = adjusted;


    if (!QApplicationPrivate::set_pal)
        QApplication::setPalette(*sys_pal);
}

/*!
    Returns the default application font.

    \sa fontMetrics(), QWidget::font()
*/
QFont QApplication::font()
{
    if (!QApplicationPrivate::app_font)
        QApplicationPrivate::app_font = new QFont(QLatin1String("Helvetica"));
    return *QApplicationPrivate::app_font;
}

/*!
    \overload

    Returns the default font for the \a widget.

    \sa fontMetrics(), QWidget::setFont()
*/

QFont QApplication::font(const QWidget *widget)
{
    FontHash *hash = app_fonts();
    if (widget && hash  && hash->size()) {
        QHash<QByteArray, QFont>::ConstIterator it =
                hash->constFind(widget->metaObject()->className());
        if (it != hash->constEnd())
            return it.value();
        for (it = hash->constBegin(); it != hash->constEnd(); ++it) {
            if (widget->inherits(it.key()))
                return it.value();
        }
    }
    return font();
}

/*!
    \overload

    Returns the font for widgets of the given \a className.

    \sa setFont(), QWidget::font()
*/
QFont QApplication::font(const char *className)
{
    FontHash *hash = app_fonts();
    if (className && hash && hash->size()) {
        QHash<QByteArray, QFont>::ConstIterator it = hash->constFind(className);
        if (it != hash->constEnd())
            return *it;
    }
    return font();
}


/*!
    Changes the default application font to \a font. If \a className
    is passed, the change applies only to classes that inherit \a
    className (as reported by QObject::inherits()).

    On application start-up, the default font depends on the window
    system. It can vary depending on both the window system version and
    the locale. This function lets you override the default font; but
    overriding may be a bad idea because, for example, some locales need
    extra large fonts to support their special characters.

    \warning Do not use this function in conjunction with \l{Qt Style Sheets}.
    The font of an application can be customized using the "font" style sheet
    property. To set a bold font for all QPushButtons, set the application
    styleSheet() as "QPushButton { font: bold }"

    \sa font(), fontMetrics(), QWidget::setFont()
*/

void QApplication::setFont(const QFont &font, const char *className)
{
    bool all = false;
    FontHash *hash = app_fonts();
    if (!className) {
        if (!QApplicationPrivate::app_font)
            QApplicationPrivate::app_font = new QFont(font);
        else
            *QApplicationPrivate::app_font = font;
        if (hash && hash->size()) {
            all = true;
            hash->clear();
        }
    } else if (hash) {
        hash->insert(className, font);
    }
    if (QApplicationPrivate::is_app_running && !QApplicationPrivate::is_app_closing) {
        QEvent e(QEvent::ApplicationFontChange);
        QWidgetList wids = QApplication::allWidgets();
        for (QWidgetList::ConstIterator it = wids.constBegin(); it != wids.constEnd(); ++it) {
            register QWidget *w = *it;
            if (all || (!className && w->isWindow()) || w->inherits(className)) // matching class
                sendEvent(w, &e);
        }
    }
    if (!className && (!QApplicationPrivate::sys_font || !font.isCopyOf(*QApplicationPrivate::sys_font))) {
        if (!QApplicationPrivate::set_font)
            QApplicationPrivate::set_font = new QFont(font);
        else
            *QApplicationPrivate::set_font = font;
    }
}

/*! \internal
*/
void QApplicationPrivate::setSystemFont(const QFont &font)
{
     if (!sys_font)
        sys_font = new QFont(font);
    else
        *sys_font = font;

    if (!QApplicationPrivate::set_font)
        QApplication::setFont(*sys_font);
}

/*!
    \property QApplication::windowIcon
    \brief the default window icon

    \sa QWidget::setWindowIcon(), {Setting the Application Icon}
*/
QIcon QApplication::windowIcon()
{
    return QApplicationPrivate::app_icon ? *QApplicationPrivate::app_icon : QIcon();
}

void QApplication::setWindowIcon(const QIcon &icon)
{
    if (!QApplicationPrivate::app_icon)
        QApplicationPrivate::app_icon = new QIcon();
    *QApplicationPrivate::app_icon = icon;
    if (QApplicationPrivate::is_app_running && !QApplicationPrivate::is_app_closing) {
#ifdef Q_WS_MAC
        void qt_mac_set_app_icon(const QPixmap &); //qapplication_mac.cpp
        QSize size = QApplicationPrivate::app_icon->actualSize(QSize(128, 128));
        qt_mac_set_app_icon(QApplicationPrivate::app_icon->pixmap(size));
#endif
        QEvent e(QEvent::ApplicationWindowIconChange);
        QWidgetList all = QApplication::allWidgets();
        for (QWidgetList::ConstIterator it = all.constBegin(); it != all.constEnd(); ++it) {
            register QWidget *w = *it;
            if (w->isWindow())
                sendEvent(w, &e);
        }
    }
}

/*!
    Returns a list of the top-level widgets (windows) in the
    application.

    Note that some of the top-level widgets may be hidden, for
    example a tooltip if no tooltip is currently shown.

    Example:

    \code
        void showAllHiddenTopLevelWidgets()
        {
            foreach (QWidget *widget, QApplication::topLevelWidgets()) {
                if (widget->isHidden())
                    widget->show();
            }
        }
    \endcode

    \sa allWidgets(), QWidget::isWindow(), QWidget::isHidden()
*/
QWidgetList QApplication::topLevelWidgets()
{
    QWidgetList list;
    QWidgetList all = allWidgets();

    for (QWidgetList::ConstIterator it = all.constBegin(); it != all.constEnd(); ++it) {
        QWidget *w = *it;
        if (w->isWindow() && w->windowType() != Qt::Desktop)
            list.append(w);
    }
    return list;
}

/*!
    Returns a list of all the widgets in the application.

    The list is empty (QList::isEmpty()) if there are no widgets.

    Note that some of the widgets may be hidden.

    Example:
    \code
        void updateAllWidgets()
        {
            foreach (QWidget *widget, QApplication::allWidgets())
                widget->update();
        }
    \endcode

    \sa topLevelWidgets(), QWidget::isVisible()
*/

QWidgetList QApplication::allWidgets()
{
    QWidgetList list;
    if (QWidgetPrivate::mapper)
        list += QWidgetPrivate::mapper->values();
    if (QWidgetPrivate::uncreatedWidgets)
        list += QWidgetPrivate::uncreatedWidgets->toList();
    return list;
}

/*!
  Returns the application widget that has the keyboard input focus, or
  0 if no widget in this application has the focus.

  \sa QWidget::setFocus(), QWidget::hasFocus(), activeWindow(), focusChanged()
*/

QWidget *QApplication::focusWidget()
{
    return QApplicationPrivate::focus_widget;
}

void QApplicationPrivate::setFocusWidget(QWidget *focus, Qt::FocusReason reason)
{
    hidden_focus_widget = 0;

    if (focus != focus_widget) {
        if (focus && focus->isHidden()) {
            hidden_focus_widget = focus;
            return;
        }

        if (focus && (reason == Qt::BacktabFocusReason || reason == Qt::TabFocusReason)
            && qt_in_tab_key_event)
            focus->window()->setAttribute(Qt::WA_KeyboardFocusChange);
        else if (focus && reason == Qt::ShortcutFocusReason) {
            focus->window()->setAttribute(Qt::WA_KeyboardFocusChange);
        }
        QWidget *prev = focus_widget;

        if (prev && reason != Qt::PopupFocusReason && reason != Qt::MenuBarFocusReason) {
            QInputContext *qic = prev->inputContext();
            if(qic) {
                qic->reset();
                qic->setFocusWidget(0);
            }
        }

        focus_widget = focus;
        if(focus_widget)
            focus_widget->d_func()->setFocus_sys();

        if (reason != Qt::NoFocusReason) {

            //send events
            if (prev) {
#ifdef QT_KEYPAD_NAVIGATION
                if (QApplication::keypadNavigationEnabled()) {
                    if (prev->hasEditFocus() && reason != Qt::PopupFocusReason)
                        prev->setEditFocus(false);
                }
#endif
                QFocusEvent out(QEvent::FocusOut, reason);
                QPointer<QWidget> that = prev;
                QApplication::sendEvent(prev, &out);
                if (that)
                    QApplication::sendEvent(that->style(), &out);
            }
            if(focus && QApplicationPrivate::focus_widget == focus) {
                QInputContext *qic = focus->inputContext();
                if (qic && focus_widget->testAttribute(Qt::WA_WState_Created))
                    qic->setFocusWidget( focus_widget );
                QFocusEvent in(QEvent::FocusIn, reason);
                QPointer<QWidget> that = focus;
                QApplication::sendEvent(focus, &in);
                if (that)
                    QApplication::sendEvent(that->style(), &in);
            }
        }
        emit qApp->focusChanged(prev, focus_widget);
    }
}


/*!
  Returns the application top-level window that has the keyboard input
  focus, or 0 if no application window has the focus. Note that
  there might be an activeWindow() even if there is no focusWidget(),
  for example if no widget in that window accepts key events.

  \sa QWidget::setFocus(), QWidget::hasFocus(), focusWidget()
*/

QWidget *QApplication::activeWindow()
{
    return QApplicationPrivate::active_window;
}

/*!
  Returns display (screen) font metrics for the application font.

  \sa font(), setFont(), QWidget::fontMetrics(), QPainter::fontMetrics()
*/

QFontMetrics QApplication::fontMetrics()
{
    return desktop()->fontMetrics();
}


/*!
    Closes all top-level windows.

    This function is particularly useful for applications with many
    top-level windows. It could, for example, be connected to a
    \gui{Exit} entry in the \gui{File} menu:

    \quotefromfile mainwindows/mdi/mainwindow.cpp
    \skipto exitAct = new QAct
    \printuntil SLOT(closeAllWindows())

    The windows are closed in random order, until one window does not
    accept the close event. The application quits when the last window
    was successfully closed; this can be turned off by setting \l
    quitOnLastWindowClosed to false.

    \sa quitOnLastWindowClosed, lastWindowClosed()  QWidget::close(), QWidget::closeEvent(), lastWindowClosed(),
        quit(), topLevelWidgets(), QWidget::isWindow()
*/
void QApplication::closeAllWindows()
{
    bool did_close = true;
    QWidget *w;
    while((w = activeModalWidget()) && did_close) {
        if(!w->isVisible())
            break;
        did_close = w->close();
    }
    QWidgetList list = QApplication::topLevelWidgets();
    for (int i = 0; did_close && i < list.size(); ++i) {
        w = list.at(i);
        if (w->isVisible() && w->windowType() != Qt::Desktop) {
            did_close = w->close();
            list = QApplication::topLevelWidgets();
            i = -1;
        }
    }
}

/*!
    Displays a simple message box about Qt. The message includes the
    version number of Qt being used by the application.