qwindowsxpstyle.cpp

奇趣公司比较新的qt/emd版本

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#include "qwindowsxpstyle.h"
#include "qwindowsxpstyle_p.h"

#if !defined(QT_NO_STYLE_WINDOWSXP) || defined(QT_PLUGIN)

#include <private/qobject_p.h>
#include <private/qpaintengine_raster_p.h>
#include <qlibrary.h>
#include <qpainter.h>
#include <qpaintengine.h>
#include <qwidget.h>
#include <qapplication.h>
#include <qpixmapcache.h>

#include <qdesktopwidget.h>
#include <qtoolbutton.h>
#include <qtabbar.h>
#include <qcombobox.h>
#include <qscrollbar.h>
#include <qheaderview.h>
#include <qspinbox.h>
#include <qstackedwidget.h>
#include <qpushbutton.h>
#include <qtoolbar.h>
#include <qlabel.h>
#include <qvarlengtharray.h>
#include <qdebug.h>

// Runtime resolved theme engine function calls
typedef bool (WINAPI *PtrIsAppThemed)();
typedef bool (WINAPI *PtrIsThemeActive)();
typedef HRESULT (WINAPI *PtrGetThemePartSize)(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, OPTIONAL RECT *prc, enum THEMESIZE eSize, OUT SIZE *psz);
typedef HTHEME (WINAPI *PtrOpenThemeData)(HWND hwnd, LPCWSTR pszClassList);
typedef HRESULT (WINAPI *PtrCloseThemeData)(HTHEME hTheme);
typedef HRESULT (WINAPI *PtrDrawThemeBackground)(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, const RECT *pRect, OPTIONAL const RECT *pClipRect);
typedef HRESULT (WINAPI *PtrDrawThemeBackgroundEx)(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, const RECT *pRect, OPTIONAL const DTBGOPTS *pOptions);
typedef HRESULT (WINAPI *PtrGetCurrentThemeName)(OUT LPWSTR pszThemeFileName, int cchMaxNameChars, OUT OPTIONAL LPWSTR pszColorBuff, int cchMaxColorChars, OUT OPTIONAL LPWSTR pszSizeBuff, int cchMaxSizeChars);
typedef HRESULT (WINAPI *PtrGetThemeDocumentationProperty)(LPCWSTR pszThemeName, LPCWSTR pszPropertyName, OUT LPWSTR pszValueBuff, int cchMaxValChars);
typedef HRESULT (WINAPI *PtrGetThemeBool)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT BOOL *pfVal);
typedef HRESULT (WINAPI *PtrGetThemeColor)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT COLORREF *pColor);
typedef HRESULT (WINAPI *PtrGetThemeEnumValue)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT int *piVal);
typedef HRESULT (WINAPI *PtrGetThemeFilename)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT LPWSTR pszThemeFileName, int cchMaxBuffChars);
typedef HRESULT (WINAPI *PtrGetThemeFont)(HTHEME hTheme, OPTIONAL HDC hdc, int iPartId, int iStateId, int iPropId, OUT LOGFONT *pFont);
typedef HRESULT (WINAPI *PtrGetThemeInt)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT int *piVal);
typedef HRESULT (WINAPI *PtrGetThemeIntList)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT INTLIST *pIntList);
typedef HRESULT (WINAPI *PtrGetThemeMargins)(HTHEME hTheme, OPTIONAL HDC hdc, int iPartId, int iStateId, int iPropId, OPTIONAL RECT *prc, OUT MARGINS *pMargins);
typedef HRESULT (WINAPI *PtrGetThemeMetric)(HTHEME hTheme, OPTIONAL HDC hdc, int iPartId, int iStateId, int iPropId, OUT int *piVal);
typedef HRESULT (WINAPI *PtrGetThemePartSize)(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, OPTIONAL RECT *prc, enum THEMESIZE eSize, OUT SIZE *psz);
typedef HRESULT (WINAPI *PtrGetThemePosition)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT POINT *pPoint);
typedef HRESULT (WINAPI *PtrGetThemePropertyOrigin)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT enum PROPERTYORIGIN *pOrigin);
typedef HRESULT (WINAPI *PtrGetThemeRect)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT RECT *pRect);
typedef HRESULT (WINAPI *PtrGetThemeString)(HTHEME hTheme, int iPartId, int iStateId, int iPropId, OUT LPWSTR pszBuff, int cchMaxBuffChars);
typedef HRESULT (WINAPI *PtrGetThemeBackgroundRegion)(HTHEME hTheme, OPTIONAL HDC hdc, int iPartId, int iStateId, const RECT *pRect, OUT HRGN *pRegion);
typedef BOOL (WINAPI *PtrIsThemeBackgroundPartiallyTransparent)(HTHEME hTheme, int iPartId, int iStateId);

static PtrIsAppThemed pIsAppThemed = 0;
static PtrIsThemeActive pIsThemeActive = 0;
static PtrOpenThemeData pOpenThemeData = 0;
static PtrCloseThemeData pCloseThemeData = 0;
static PtrDrawThemeBackground pDrawThemeBackground = 0;
static PtrDrawThemeBackgroundEx pDrawThemeBackgroundEx = 0;
static PtrGetCurrentThemeName pGetCurrentThemeName = 0;
static PtrGetThemeBool pGetThemeBool = 0;
static PtrGetThemeColor pGetThemeColor = 0;
static PtrGetThemeEnumValue pGetThemeEnumValue = 0;
static PtrGetThemeFilename pGetThemeFilename = 0;
static PtrGetThemeFont pGetThemeFont = 0;
static PtrGetThemeInt pGetThemeInt = 0;
static PtrGetThemeIntList pGetThemeIntList = 0;
static PtrGetThemeMargins pGetThemeMargins = 0;
static PtrGetThemeMetric pGetThemeMetric = 0;
static PtrGetThemePartSize pGetThemePartSize = 0;
static PtrGetThemePosition pGetThemePosition = 0;
static PtrGetThemePropertyOrigin pGetThemePropertyOrigin = 0;
static PtrGetThemeRect pGetThemeRect = 0;
static PtrGetThemeString pGetThemeString = 0;
static PtrGetThemeBackgroundRegion pGetThemeBackgroundRegion = 0;
static PtrGetThemeDocumentationProperty pGetThemeDocumentationProperty = 0;
static PtrIsThemeBackgroundPartiallyTransparent pIsThemeBackgroundPartiallyTransparent = 0;

// General const values
static const int windowsItemFrame        =  2; // menu item frame width
static const int windowsSepHeight        =  9; // separator item height
static const int windowsItemHMargin      =  3; // menu item hor text margin
static const int windowsItemVMargin      =  0; // menu item ver text margin
static const int windowsArrowHMargin     =  6; // arrow horizontal margin
static const int windowsCheckMarkHMargin =  0; // horiz. margins of check mark
static const int windowsRightBorder      = 12; // right border on windows

// External function calls
extern Q_GUI_EXPORT HDC qt_win_display_dc();



// 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) {
        if (bufferDC && nullBitmap)
            SelectObject(bufferDC, nullBitmap);
        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();
    if (limboWidget)
        limboWidget->deleteLater();
    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 && widget->testAttribute(Qt::WA_WState_Created)) {
        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, QLatin1String("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(QLatin1String("uxtheme"));
        pIsAppThemed = (PtrIsAppThemed)themeLib.resolve("IsAppThemed");
        if (pIsAppThemed) {