qwindowsxpstyle.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

#ifdef DEBUG_XP_STYLE
    void dumpNativeDIB(int w, int h);
    void showProperties(XPThemeData &themeData);
#endif

    static QAtomic ref;
    static bool use_xp;
    static QWidget *limboWidget;
    static QPixmap *tabbody;

    QHash<ThemeMapKey, ThemeMapData> alphaCache;
    HDC bufferDC;
    HBITMAP bufferBitmap;
    HBITMAP nullBitmap;
    uchar *bufferPixels;
    int bufferW, bufferH;
};


// Theme data helper ------------------------------------------------------------------------------
/* \internal
    Returns true if the themedata is valid for use.
*/
bool XPThemeData::isValid()
{
    return QWindowsXPStylePrivate::useXP() && name.size() && handle();
}


/* \internal
    Returns the theme engine handle to the specific class.
    If the handle hasn't been opened before, it opens the data, and
    adds it to a static map, for caching.
*/
HTHEME XPThemeData::handle()
{
    if (!QWindowsXPStylePrivate::useXP())
        return 0;

    if (!htheme && QWindowsXPStylePrivate::handleMap)
        htheme = QWindowsXPStylePrivate::handleMap->operator[](name);

    if (!htheme) {
        htheme = pOpenThemeData(QWindowsXPStylePrivate::winId(widget),
                                (TCHAR*)name.utf16());
        if (htheme) {
            if (!QWindowsXPStylePrivate::handleMap)
                QWindowsXPStylePrivate::handleMap = new QMap<QString, HTHEME>;
            QWindowsXPStylePrivate::handleMap->operator[](name) = htheme;
        }
    }

    return htheme;
}

/* \internal
    Converts a QRect to the native RECT structure.
*/
RECT XPThemeData::toRECT(const QRect &qr)
{
    RECT r;
    r.left = qr.x();
    r.right = qr.x() + qr.width();
    r.top = qr.y();
    r.bottom = qr.y() + qr.height();
    return r;
}

/* \internal
    Returns the native region of a part, if the part is considered
    transparent. The region is scaled to the parts size (rect).
*/
HRGN XPThemeData::mask()
{
    if (!pIsThemeBackgroundPartiallyTransparent(handle(), partId, stateId))
        return 0;

    HRGN hrgn;
    HDC dc = painter == 0 ? 0 : painter->paintEngine()->getDC();
    RECT nativeRect = toRECT(rect);
    pGetThemeBackgroundRegion(handle(), dc, partId, stateId, &nativeRect, &hrgn);
    if (dc)
        painter->paintEngine()->releaseDC(dc);
    return hrgn;
}

// QWindowsXPStylePrivate -------------------------------------------------------------------------
// Static initializations
QWidget *QWindowsXPStylePrivate::limboWidget = 0;
QPixmap *QWindowsXPStylePrivate::tabbody = 0;
QMap<QString,HTHEME> *QWindowsXPStylePrivate::handleMap = 0;
bool QWindowsXPStylePrivate::use_xp = false;
QAtomic QWindowsXPStylePrivate::ref = QAtomic(-1); // -1 based refcounting

/* \internal
    Checks if the theme engine can/should be used, or if we should
    fall back to Windows style.
*/
bool QWindowsXPStylePrivate::useXP(bool update)
{
    if (!update)
        return use_xp;
    return (use_xp = resolveSymbols() && pIsThemeActive()
            && (pIsAppThemed() || !QApplication::instance()));
}

/* \internal
    Handles refcounting, and queries the theme engine for usage.
*/
void QWindowsXPStylePrivate::init(bool force)
{
    if (ref.ref() && !force)
        return;
    if (!force) // -1 based atomic refcounting
        ref.ref();

    useXP(true);
}

/* \internal
    Cleans up all static data.
*/
void QWindowsXPStylePrivate::cleanup(bool force)
{
    if(bufferBitmap)
        DeleteObject(bufferBitmap);
    bufferBitmap = 0;

    if(bufferDC)
        DeleteDC(bufferDC);
    bufferDC = 0;

    if (ref.deref() && !force)
        return;
    if (!force)  // -1 based atomic refcounting
        ref.deref();

    use_xp = false;
    cleanupHandleMap();
    delete limboWidget;
    delete tabbody;
    limboWidget = 0;
    tabbody = 0;
}

/* \internal
    Closes all open theme data handles to ensure that we don't leak
    resources, and that we don't refere to old handles when for
    example the user changes the theme style.
*/
void QWindowsXPStylePrivate::cleanupHandleMap()
{
    if (!handleMap)
        return;

    QMap<QString, HTHEME>::Iterator it;
    for (it = handleMap->begin(); it != handleMap->end(); ++it)
        pCloseThemeData(it.value());
    delete handleMap;
    handleMap = 0;
}

/*! \internal
    This function will always return a valid window handle, and might
    create a limbo widget to do so.
    We often need a window handle to for example open theme data, so
    this function ensures that we get one.
*/
HWND QWindowsXPStylePrivate::winId(const QWidget *widget)
{
    if (widget)
        return widget->winId();

    if (!limboWidget) {
        limboWidget = new QWidget(0);
        limboWidget->setObjectName(QLatin1String("xp_limbo_widget"));
    }

    return limboWidget->winId();
}

/*! \internal
    Returns the pointer to a tab widgets body pixmap, scaled to the
    height of the screen. This way the theme engine doesn't need to
    scale the body for every time we ask for it. (Speed optimization)
*/
const QPixmap *QWindowsXPStylePrivate::tabBody(QWidget *)
{
    if (!tabbody) {
        SIZE sz;
        XPThemeData theme(0, 0, "TAB", TABP_BODY);
        pGetThemePartSize(theme.handle(), qt_win_display_dc(), TABP_BODY, 0, 0, TS_TRUE, &sz);

        tabbody = new QPixmap(sz.cx, QApplication::desktop()->screenGeometry().height());
        QPainter painter(tabbody);
        theme.rect = QRect(0, 0, sz.cx, sz.cy);
        drawBackground(theme);
        // We fill with the last line of the themedata, that
        // way we don't get a tiled pixmap inside big tabs
        QPixmap temp(sz.cx, 1);
        painter.drawPixmap(0, 0, temp, 0, sz.cy-1, -1, -1);
        painter.drawTiledPixmap(0, sz.cy, sz.cx, tabbody->height()-sz.cy, temp);
    }
    return tabbody;
}

/*! \internal
    Returns true if all the necessary theme engine symbols were
    resolved.
*/
bool QWindowsXPStylePrivate::resolveSymbols()
{
    static bool tried = false;
    if (!tried) {
        tried = true;
        QLibrary themeLib("uxtheme");
        pIsAppThemed = (PtrIsAppThemed)themeLib.resolve("IsAppThemed");
        if (pIsAppThemed) {
            pIsThemeActive          = (PtrIsThemeActive         )themeLib.resolve("IsThemeActive");
            pGetThemePartSize       = (PtrGetThemePartSize      )themeLib.resolve("GetThemePartSize");
            pOpenThemeData          = (PtrOpenThemeData         )themeLib.resolve("OpenThemeData");
            pCloseThemeData         = (PtrCloseThemeData        )themeLib.resolve("CloseThemeData");
            pDrawThemeBackground    = (PtrDrawThemeBackground   )themeLib.resolve("DrawThemeBackground");
            pDrawThemeBackgroundEx  = (PtrDrawThemeBackgroundEx )themeLib.resolve("DrawThemeBackgroundEx");
            pGetCurrentThemeName    = (PtrGetCurrentThemeName   )themeLib.resolve("GetCurrentThemeName");
            pGetThemeBool           = (PtrGetThemeBool          )themeLib.resolve("GetThemeBool");
            pGetThemeColor          = (PtrGetThemeColor         )themeLib.resolve("GetThemeColor");
            pGetThemeEnumValue      = (PtrGetThemeEnumValue     )themeLib.resolve("GetThemeEnumValue");
            pGetThemeFilename       = (PtrGetThemeFilename      )themeLib.resolve("GetThemeFilename");
            pGetThemeFont           = (PtrGetThemeFont          )themeLib.resolve("GetThemeFont");
            pGetThemeInt            = (PtrGetThemeInt           )themeLib.resolve("GetThemeInt");
            pGetThemeIntList        = (PtrGetThemeIntList       )themeLib.resolve("GetThemeIntList");
            pGetThemeMargins        = (PtrGetThemeMargins       )themeLib.resolve("GetThemeMargins");
            pGetThemeMetric         = (PtrGetThemeMetric        )themeLib.resolve("GetThemeMetric");
            pGetThemePartSize       = (PtrGetThemePartSize      )themeLib.resolve("GetThemePartSize");
            pGetThemePosition       = (PtrGetThemePosition      )themeLib.resolve("GetThemePosition");
            pGetThemePropertyOrigin = (PtrGetThemePropertyOrigin)themeLib.resolve("GetThemePropertyOrigin");
            pGetThemeRect           = (PtrGetThemeRect          )themeLib.resolve("GetThemeRect");
            pGetThemeString         = (PtrGetThemeString        )themeLib.resolve("GetThemeString");
            pGetThemeBackgroundRegion              = (PtrGetThemeBackgroundRegion             )themeLib.resolve("GetThemeBackgroundRegion");
            pGetThemeDocumentationProperty         = (PtrGetThemeDocumentationProperty        )themeLib.resolve("GetThemeDocumentationProperty");
            pIsThemeBackgroundPartiallyTransparent = (PtrIsThemeBackgroundPartiallyTransparent)themeLib.resolve("IsThemeBackgroundPartiallyTransparent");
        }
    }

    return pIsAppThemed != 0;
}

/*! \internal
    Returns a native buffer (DIB section) of at least the size of
    ( \a x , \a y ). The buffer has a 32 bit depth, to not lose
    the alpha values on proper alpha-pixmaps.
*/
HBITMAP QWindowsXPStylePrivate::buffer(int w, int h)
{
    // If we already have a HBITMAP which is of adequate size, just return that
    if (bufferBitmap) {
        if (bufferW >= w && bufferH >= h)
            return bufferBitmap;
        // Not big enough, discard the old one
        if (bufferDC && nullBitmap)
            SelectObject(bufferDC, nullBitmap);
        DeleteObject(bufferBitmap);
        bufferBitmap = 0;
    }

    w = qMax(bufferW, w);
    h = qMax(bufferH, h);

    if (!bufferDC)
        bufferDC = CreateCompatibleDC(qt_win_display_dc());

    // Define the header
    BITMAPINFO bmi;
    memset(&bmi, 0, sizeof(bmi));
    bmi.bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth       = w;
    bmi.bmiHeader.biHeight      = -h;
    bmi.bmiHeader.biPlanes      = 1;
    bmi.bmiHeader.biBitCount    = 32;
    bmi.bmiHeader.biCompression = BI_RGB;

    // Create the pixmap
    bufferPixels = 0;
    bufferBitmap = CreateDIBSection(bufferDC, &bmi, DIB_RGB_COLORS, (void **) &bufferPixels, 0, 0);
    GdiFlush();
    nullBitmap = (HBITMAP)SelectObject(bufferDC, bufferBitmap);

    if (!bufferBitmap) {
        qErrnoWarning("QWindowsXPStylePrivate::buffer(w,h), failed to create dibsection");
        bufferW = 0;
        bufferH = 0;
        return 0;
    }
    if (!bufferPixels) {
        qErrnoWarning("QWindowsXPStylePrivate::buffer(w,h), did not allocate pixel data");
        bufferW = 0;
        bufferH = 0;
        return 0;
    }
    bufferW = w;
    bufferH = h;
#ifdef DEBUG_XP_STYLE
    qDebug("Creating new dib section (%d, %d)", w, h);
#endif
    return bufferBitmap;
}

/*! \internal
    Returns true if the part contains any transparency at all. This does
    not indicate what kind of transparency we're dealing with. It can be
        - Alpha transparency
        - Masked transparency
*/
bool QWindowsXPStylePrivate::isTransparent(XPThemeData &themeData)
{
    return pIsThemeBackgroundPartiallyTransparent(themeData.handle(), themeData.partId,
                                                  themeData.stateId);
}

/*! \internal
    Returns a QRegion of the region of the part
*/
QRegion QWindowsXPStylePrivate::region(XPThemeData &themeData)
{
    HRGN hRgn = 0;
    RECT rect = themeData.toRECT(themeData.rect);
    if (!SUCCEEDED(pGetThemeBackgroundRegion(themeData.handle(), bufferHDC(), themeData.partId,
                                             themeData.stateId, &rect, &hRgn)))
        return QRegion();

    QRegion rgn = QRegion(0,0,1,1);
    CombineRgn(rgn.handle(), hRgn, 0, RGN_COPY);
    DeleteObject(hRgn);
    return rgn;
}

/*! \internal
    Sets the parts region on a window.
*/
void QWindowsXPStylePrivate::setTransparency(QWidget *widget, XPThemeData &themeData)
{
    HRGN hrgn = themeData.mask();
    if (hrgn)
        SetWindowRgn(winId(widget), hrgn, true);
}

/*! \internal
    Returns true if the native doublebuffer contains a pixel which
    has a non-0xFF alpha value. Should only be use when its
    guaranteed that data painted into the buffer wasn't a proper
    alpha pixmap.
*/
bool QWindowsXPStylePrivate::hasAnyData(const QRect &rect)
{
    const int startX = rect.left();
    const int startY = rect.top();