qwidget.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

#endif
}

/*
  Returns the widget's clipping rectangle.
*/
QRect QWidgetPrivate::clipRect() const
{
    Q_Q(const QWidget);
    const QWidget * w = q;
    if (!w->isVisible())
        return QRect();
    QRect r = q->rect();
    int ox = 0;
    int oy = 0;
    while (w
            && w->isVisible()
            && !w->isWindow()
            && w->parentWidget()) {
        ox -= w->x();
        oy -= w->y();
        w = w->parentWidget();
        r &= QRect(ox, oy, w->width(), w->height());
    }
    return r;
}

/*
  Returns the widget's clipping region (without siblings).
*/
QRegion QWidgetPrivate::clipRegion() const
{
    Q_Q(const QWidget);
    if (!q->isVisible())
        return QRegion();
    QRegion r(q->rect());
    const QWidget * w = q;
    const QWidget *ignoreUpTo;
    int ox = 0;
    int oy = 0;
    while (w
           && w->isVisible()
           && !w->isWindow()
           && w->parentWidget()) {
        ox -= w->x();
        oy -= w->y();
        ignoreUpTo = w;
        w = w->parentWidget();
        r &= QRegion(ox, oy, w->width(), w->height());

        int i = 0;
        while(w->d_func()->children.at(i++) != static_cast<const QObject *>(ignoreUpTo))
            ;
        for ( ; i < w->d_func()->children.size(); ++i) {
            if(QWidget *sibling = qobject_cast<QWidget *>(w->d_func()->children.at(i))) {
                if(sibling->isVisible() && !sibling->isWindow()) {
                    QRect siblingRect(ox+sibling->x(), oy+sibling->y(),
                                      sibling->width(), sibling->height());
                    if(siblingRect.intersects(q->rect()))
                        r -= QRegion(siblingRect);
                }
            }
        }
    }
    return r;
}

void QWidgetPrivate::subtractOpaqueChildren(QRegion &rgn, const QRegion &clipRgn, const QPoint &offset) const
{
    for (int i=0; i < children.size(); ++i) {
        if (QWidget *child = qobject_cast<QWidget *>(children.at(i))) {
            if (child->isVisible() && !child->isWindow()) {
                QRegion childRgn = clipRgn & child->geometry().translated(offset);
                QWidgetPrivate *cd = child->d_func();
                if (cd->extra && !cd->extra->mask.isEmpty())
                    childRgn &= cd->extra->mask.translated(offset + cd->data.crect.topLeft());

                if (childRgn.isEmpty())
                    continue;

                if (cd->isOpaque())
                    rgn -= childRgn;
                else
                    cd->subtractOpaqueChildren(rgn, childRgn, offset + child->geometry().topLeft());
            }
        }
    }
}

bool QWidgetPrivate::hasBackground() const
{
    Q_Q(const QWidget);
    if (!q->isWindow() && q->parentWidget() && q->parentWidget()->testAttribute(Qt::WA_PaintOnScreen))
        return true;
    if (q->testAttribute(Qt::WA_PaintOnScreen))
        return true;
    if (!q->testAttribute(Qt::WA_OpaquePaintEvent) && !q->testAttribute(Qt::WA_NoSystemBackground)) {
        const QPalette &pal = q->palette();
        QPalette::ColorRole bg = q->backgroundRole();
        QBrush bgBrush = pal.brush(bg);
        return (bgBrush.style() != Qt::NoBrush &&
                ((q->isWindow() || q->windowType() == Qt::SubWindow)
                 || (QPalette::ColorRole(bg_role) != QPalette::NoRole || (pal.resolve() & (1<<bg)))));
    }
    return false;
}
void QWidgetPrivate::updateIsOpaque()
{
#ifdef Q_WS_MAC
    Q_Q(QWidget);
    extern void qt_mac_set_widget_is_opaque(QWidget*, bool); //qwidget_mac.cpp
    qt_mac_set_widget_is_opaque(q, isOpaque());
#endif
}

bool QWidgetPrivate::isOpaque() const
{
    Q_Q(const QWidget);
#ifdef Q_WS_X11
    if (q->testAttribute(Qt::WA_X11OpenGLOverlay))
	return false;
#endif
    if (q->testAttribute(Qt::WA_OpaquePaintEvent)
        || q->testAttribute(Qt::WA_PaintOnScreen)
        || q->testAttribute(Qt::WA_NoSystemBackground))
        return true;

    if (!q->autoFillBackground())
        return false;

    const QPalette &pal = q->palette();
    QPalette::ColorRole bg = q->backgroundRole();
    QBrush bgBrush = pal.brush(bg);
    return bgBrush.style() != Qt::NoBrush && bgBrush.isOpaque();
}

/*!
    \fn void QPixmap::fill(const QWidget *widget, const QPoint &offset)

    Fills the pixmap with the \a widget's background color or pixmap
    according to the given offset.

    The QPoint \a offset defines a point in widget coordinates to
    which the pixmap's top-left pixel will be mapped to. This is only
    significant if the widget has a background pixmap; otherwise the
    pixmap will simply be filled with the background color of the
    widget.
*/

void QPixmap::fill( const QWidget *widget, const QPoint &off )
{
    QPainter p(this);
    p.translate(-off);
    widget->d_func()->paintBackground(&p, QRect(off, size()));

}


void QWidgetPrivate::paintBackground(QPainter *painter, const QRect &rect, bool asRoot) const
{
#define FILL_RECT_WORKAROUND(painter, rect, brush)              \
    if (brush.style() == Qt::TexturePattern)                    \
        painter->drawTiledPixmap(rect, brush.texture(), rect.topLeft()); \
    else                                                        \
        painter->fillRect(rect, brush);

    Q_Q(const QWidget);

    const QBrush autoFillBrush = q->palette().brush(q->backgroundRole());

    if (asRoot && !(q->autoFillBackground() && autoFillBrush.isOpaque())) {
        const QBrush bg = q->palette().brush(QPalette::Window);
#ifdef Q_WS_QWS
        if (painter->paintEngine()->hasFeature(QPaintEngine::PorterDuff))
            painter->setCompositionMode(QPainter::CompositionMode_Source); //copy alpha straight in
#endif

        FILL_RECT_WORKAROUND(painter, rect, bg);
    }

    if (q->autoFillBackground()) {
        FILL_RECT_WORKAROUND(painter, rect, autoFillBrush);
    }
}


/*!
  \internal
  This function is called when a widget is hidden or destroyed.
  It resets some application global pointers that should only refer active,
  visible widgets.
*/

void QWidgetPrivate::deactivateWidgetCleanup()
{
    Q_Q(QWidget);
    // If this was the active application window, reset it
    if (qApp->activeWindow() == q)
        qApp->setActiveWindow(0);
    // If the is the active mouse press widget, reset it
#ifdef Q_WS_MAC
    extern QPointer<QWidget> qt_button_down;
#else
    extern QWidget *qt_button_down;
#endif
    if (q == qt_button_down)
        qt_button_down = 0;
}


/*!
    Returns a pointer to the widget with window identifer/handle \a
    id.

    The window identifier type depends on the underlying window
    system, see \c qwindowdefs.h for the actual definition. If there
    is no widget with this identifier, 0 is returned.
*/

QWidget *QWidget::find(WId id)
{
    return QWidgetPrivate::mapper ? QWidgetPrivate::mapper->value(id, 0) : 0;
}



/*!
    \fn WId QWidget::winId() const

    Returns the window system identifier of the widget.

    Portable in principle, but if you use it you are probably about to
    do something non-portable. Be careful.


    \sa find()
*/

/*!
    Returns the GUI style for this widget

    \sa QWidget::setStyle(), QApplication::setStyle(), QApplication::style()
*/

QStyle *QWidget::style() const
{
    Q_D(const QWidget);
    if (d->extra && d->extra->style)
        return d->extra->style;
    return qApp->style();
}

/*!
    Sets the widget's GUI style to \a style. Ownership of the style
    object is not transferred.

    If no style is set, the widget uses the application's style,
    QApplication::style() instead.

    Setting a widget's style has no effect on existing or future child
    widgets.

    \warning This function is particularly useful for demonstration
    purposes, where you want to show Qt's styling capabilities. Real
    applications should avoid it and use one consistent GUI style
    instead.

    \sa style(), QStyle, QApplication::style(), QApplication::setStyle()
*/

void QWidget::setStyle(QStyle *style)
{
    Q_D(QWidget);
    QStyle *old  = QWidget::style();
    d->createExtra();
    d->extra->style = style;
    if (!(windowType() == Qt::Desktop) // (except desktop)
         && d->polished) { // (and have been polished)
        old->unpolish(this);
        QWidget::style()->polish(this);
    }
    QEvent e(QEvent::StyleChange);
    QApplication::sendEvent(this, &e);
#ifdef QT3_SUPPORT
    styleChange(*old);
#endif
}

#ifdef QT3_SUPPORT
/*!
    \overload

    Sets the widget's GUI style to \a style using the QStyleFactory.
*/
QStyle* QWidget::setStyle(const QString &style)
{
    QStyle *s = QStyleFactory::create(style);
    setStyle(s);
    return s;
}
#endif

/*!
    \fn bool QWidget::isWindow() const

    Returns true if the widget is an independent window, otherwise
    returns false.

    A window is a widget that isn't visually the child of any other
    widget and that usually has a frame and a
    \l{QWidget::setWindowTitle()}{window title}.

    A window can have a \l{QWidget::parentWidget()}{parent widget}.
    It will then be grouped with its parent and deleted when the
    parent is deleted, minimized when the parent is minimized etc. If
    supported by the window manager, it will also have a common
    taskbar entry with its parent.

    QDialog and QMainWindow widgets are by default windows, even if a
    parent widget is specified in the constructor. This behavior is
    specified by the Qt::Window flag.

    \sa window(), isModal(), parentWidget()
*/

/*!
    \property QWidget::modal
    \brief whether the widget is a modal widget

    This property only makes sense for windows. A modal widget
    prevents widgets in all other windows from getting any input.

    \sa isWindow(), windowModality, QDialog
*/

/*!
    \property QWidget::windowModality
    \brief which windows are blocked by the modal widget
    \since 4.1

    This property only makes sense for windows. A modal widget
    prevents widgets in other windows from getting input. The value of
    this property controls which windows are blocked when the widget
    is visible. Changing this property while the window is visible has
    no effect; you must hide() the wiget first, then show() it again.

    By default, this property is Qt::NonModal.

    \sa isWindow(), QWidget::modal, QDialog
*/

Qt::WindowModality QWidget::windowModality() const
{
    return static_cast<Qt::WindowModality>(data->window_modality);
}

void QWidget::setWindowModality(Qt::WindowModality windowModality)
{
    data->window_modality = windowModality;
    // setModal_sys() will be called by setAttribute()
     setAttribute(Qt::WA_ShowModal, (data->window_modality != Qt::NonModal));
}

/*!
    \fn bool QWidget::underMouse() const

    Returns true if the widget is under the mouse cursor; otherwise
    returns false.

    This value is not updated properly during drag and drop
    operations.

    \sa enterEvent(), leaveEvent()
*/

/*!
    \property QWidget::minimized
    \brief whether this widget is minimized (iconified)

    This property is only relevant for windows.

    \sa showMinimized(), visible, show(), hide(), showNormal(), maximized
*/
bool QWidget::isMinimized() const
{ return data->window_state & Qt::WindowMinimized; }

/*!
    Shows the widget minimized, as an icon.

    Calling this function only affects \l{isWindow()}{windows}.

    \sa showNormal(), showMaximized(), show(), hide(), isVisible(),
        isMinimized()
*/
void QWidget::showMinimized()
{
    bool isMin = isMinimized();
    if (isMin && isVisible())
        return;

    ensurePolished();
#ifdef QT3_SUPPORT
    if (parent())
        QApplication::sendPostedEvents(parent(), QEvent::ChildInserted);
#endif

    if (!isMin)
        setWindowState((windowState() & ~Qt::WindowActive) | Qt::WindowMinimized);
    show();
}

/*!
    \property QWidget::maximized
    \brief whether this widget is maximized

    This property is only relevant for windows.

    Note that due to limitations in some window-systems, this does not
    always report the expected results (e.g. if the user on X11
    maximizes the window via the window manager, Qt has no way of
    distinguishing this from any other resize). This is expected to
    improve as window manager protocols evolve.

    \sa windowState(), showMaximized(), visible, show(), hide(), showNormal(), minimized
*/
bool QWidget::isMaximized() const
{ return data->window_state & Qt::WindowMaximized; }



/*!  Returns the current window state. The window state is a OR'ed
  combination of Qt::WindowState: Qt::WindowMinimized,
  Qt::WindowMaximized, Qt::WindowFullScreen, and Qt::WindowActive.