src/gui/kernel/qwidget.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include "qapplication.h"
#include "qapplication_p.h"
#include "qbrush.h"
#include "qcursor.h"
#include "qdesktopwidget.h"
#include "qevent.h"
#include "qhash.h"
#include "qlayout.h"
#include "qmenu.h"
#include "qmetaobject.h"
#include "qpixmap.h"
#include "qpointer.h"
#include "qstack.h"
#include "qstyle.h"
#include "qstylefactory.h"
#include "qvariant.h"
#include "qwidget.h"
#include "qstyleoption.h"
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif
#if defined(Q_WS_WIN)
#include "qt_windows.h"
#endif
#ifdef Q_WS_MAC
# include "qt_mac_p.h"
#endif
#if defined(Q_WS_QWS)
#include "qwsmanager_qws.h"
#include "qpaintengine.h" // for PorterDuff
#endif
#include "qpainter.h"
#include "qtooltip.h"
#include "qwhatsthis.h"
#include "qdebug.h"
#include "private/qstylesheetstyle_p.h"
#include "private/qstyle_p.h"
#include "qinputcontext.h"

#ifdef Q_WS_WIN
#include <private/qwininputcontext_p.h>
#endif

#if defined(Q_WS_X11)
#include <private/qpaintengine_x11_p.h>
#include "qx11info_x11.h"
#endif

#ifndef Q_WS_MAC
#include <private/qbackingstore_p.h>
#endif

#include "qwidget_p.h"
#include "qaction_p.h"
#include "qlayout_p.h"

// widget/widget data creation count
//#define QWIDGET_EXTRA_DEBUG


QWidgetPrivate::QWidgetPrivate(int version) :
        QObjectPrivate(version), extra(0), focus_child(0)
        ,layout(0)
        ,leftmargin(0), topmargin(0), rightmargin(0), bottommargin(0)
        ,fg_role(QPalette::NoRole)
        ,bg_role(QPalette::NoRole)
        ,hd(0)
#if defined(Q_WS_X11)
        ,picture(0)
#elif defined(Q_WS_MAC)
        ,cg_hd(0)
#endif
        ,polished(0)

        , size_policy(QSizePolicy::Preferred, QSizePolicy::Preferred)
{
    if (!qApp) {
        qFatal("QWidget: Must construct a QApplication before a QPaintDevice");
        return;
    }

    if (version != QObjectPrivateVersion)
        qFatal("Cannot mix incompatible Qt libraries");

#ifdef QT_EXPERIMENTAL_REGIONS
    dirtyOpaqueChildren = true;
#endif

    isWidget = true;
    memset(high_attributes, 0, sizeof(high_attributes));
#ifdef QWIDGET_EXTRA_DEBUG
    static int count = 0;
    qDebug() << "widgets" << ++count;
#endif
}


QWidgetPrivate::~QWidgetPrivate()
{
    if (extra)
        deleteExtra();
}


void QWidgetPrivate::focusInputContext()
{
#ifndef QT_NO_IM
    Q_Q(QWidget);
    QInputContext *qic = q->inputContext();
    if (qic) {
  if(qic->focusWidget() != q)
      qic->setFocusWidget(q);
    }
#endif // QT_NO_IM
}

void QWidgetPrivate::scrollChildren(int dx, int dy)
{
    Q_Q(QWidget);
    if (q->children().size() > 0) {        // scroll children
        QPoint pd(dx, dy);
        QObjectList childObjects = q->children();
        for (int i = 0; i < childObjects.size(); ++i) { // move all children
            QWidget *w = qobject_cast<QWidget*>(childObjects.at(i));
            if (w && !w->isWindow()) {
                QPoint oldp = w->pos();
                QRect  r(w->pos() + pd, w->size());
                w->data->crect = r;
#ifndef Q_WS_QWS
                w->d_func()->setWSGeometry();
#endif
                QMoveEvent e(r.topLeft(), oldp);
                QApplication::sendEvent(w, &e);
            }
        }
    }
}


QInputContext *QWidget::inputContext()
{
    Q_D(QWidget);
    if (!testAttribute(Qt::WA_InputMethodEnabled))
        return 0;

#ifndef QT_NO_IM
    if (d->ic)
        return d->ic;
#endif
    return qApp->inputContext();
}

void QWidget::setInputContext(QInputContext *context)
{
    Q_D(QWidget);
    if (!testAttribute(Qt::WA_InputMethodEnabled))
        return;
#ifndef QT_NO_IM
    if (d->ic)
  delete d->ic;
    d->ic = context;
#endif
}


void QWidget::resetInputContext()
{
    if (!hasFocus())
        return;
#ifndef QT_NO_IM
    QInputContext *qic = this->inputContext();
    if( qic )
  qic->reset();
#endif // QT_NO_IM
}

#ifdef QT_KEYPAD_NAVIGATION
QPointer<QWidget> QWidgetPrivate::editingWidget;

bool QWidget::hasEditFocus() const
{
    const QWidget* w = this;
    while (w->d_func()->extra && w->d_func()->extra->focus_proxy)
        w = w->d_func()->extra->focus_proxy;
    return QWidgetPrivate::editingWidget == w;
}

void QWidget::setEditFocus(bool on)
{
    QWidget *f = this;
    while (f->d_func()->extra && f->d_func()->extra->focus_proxy)
        f = f->d_func()->extra->focus_proxy;

    if (QWidgetPrivate::editingWidget && QWidgetPrivate::editingWidget != f)
        QWidgetPrivate::editingWidget->setEditFocus(false);

    if (on && !f->hasFocus())
        f->setFocus();

    if ((!on && !QWidgetPrivate::editingWidget)
        || (on && QWidgetPrivate::editingWidget == f)) {
        update();
        return;
    }

    if (!on && QWidgetPrivate::editingWidget == f) {
        QWidgetPrivate::editingWidget = 0;
        QEvent event(QEvent::LeaveEditFocus);
        QApplication::sendEvent(f, &event);
        QApplication::sendEvent(f->style(), &event);
    } else if (on) {
        QWidgetPrivate::editingWidget = f;
        QEvent event(QEvent::EnterEditFocus);
        QApplication::sendEvent(f, &event);
        QApplication::sendEvent(f->style(), &event);
    }
    update();
}
#endif

bool QWidget::autoFillBackground() const
{
    Q_D(const QWidget);
    return d->extra && d->extra->autoFillBackground;
}

void QWidget::setAutoFillBackground(bool enabled)
{
    Q_D(QWidget);
    if (!d->extra)
        d->createExtra();
    if (d->extra->autoFillBackground == enabled)
        return;

    d->extra->autoFillBackground = enabled;
    d->updateIsOpaque();
    update();
    d->updateIsOpaque();
}

QWidgetMapper *QWidgetPrivate::mapper = 0;                // widget with wid
QWidgetSet *QWidgetPrivate::uncreatedWidgets = 0;         // widgets with no wid


/*****************************************************************************
  QWidget utility functions
 *****************************************************************************/


static QFont qt_naturalWidgetFont(QWidget* w) {
    QFont naturalfont = QApplication::font(w);
    if (w->parentWidget()
        && (!w->isWindow() || w->testAttribute(Qt::WA_WindowPropagation))) {
        if (!naturalfont.isCopyOf(QApplication::font()))
            naturalfont = naturalfont.resolve(w->parentWidget()->font());
        else
            naturalfont = w->parentWidget()->font();
    }
    naturalfont.resolve(0);
    return naturalfont;
}

static QPalette qt_naturalWidgetPalette(QWidget* w) {
    QPalette naturalpalette = QApplication::palette(w);
    if (w->parentWidget()
        && (!w->isWindow() || w->testAttribute(Qt::WA_WindowPropagation))) {
        if (!naturalpalette.isCopyOf(QApplication::palette()))
            naturalpalette = naturalpalette.resolve(w->parentWidget()->palette());
        else
            naturalpalette = w->parentWidget()->palette();
    }
    naturalpalette.resolve(0);
    return naturalpalette;
}

/*****************************************************************************
  QWidget member functions
 *****************************************************************************/

/*
    Widget state flags:
  \list
  \i Qt::WA_WState_Created The widget has a valid winId().
  \i Qt::WA_WState_Visible The widget is currently visible.
  \i Qt::WA_WState_Hidden The widget is hidden, i.e. it won't
  become visible unless you call show() on it. Qt::WA_WState_Hidden
  implies !Qt::WA_WState_Visible.
  \i Qt::WA_WState_CompressKeys Compress keyboard events.
  \i Qt::WA_WState_BlockUpdates Repaints and updates are disabled.
  \i Qt::WA_WState_InPaintEvent Currently processing a paint event.
  \i Qt::WA_WState_Reparented The widget has been reparented.
  \i Qt::WA_WState_ConfigPending A configuration (resize/move) event is pending.
  \i Qt::WA_WState_DND (Deprecated) The widget supports drag and drop, see setAcceptDrops().
  \endlist
*/

QWidget::QWidget(QWidget *parent, Qt::WindowFlags f)
    : QObject(*new QWidgetPrivate, 0), QPaintDevice()
{
    d_func()->init(parent, f);
}

#ifdef QT3_SUPPORT

QWidget::QWidget(QWidget *parent, const char *name, Qt::WindowFlags f)
    : QObject(*new QWidgetPrivate, 0), QPaintDevice()
{
    d_func()->init(parent , f);
    setObjectName(QString::fromAscii(name));
}
#endif

QWidget::QWidget(QWidgetPrivate &dd, QWidget* parent, Qt::WindowFlags f)
    : QObject(dd, 0), QPaintDevice()
{
    d_func()->init(parent, f);
}

int QWidget::devType() const
{
    return QInternal::Widget;
}


//### w is a "this" ptr, passed as a param because QWorkspace needs special logic
void QWidgetPrivate::adjustFlags(Qt::WindowFlags &flags, QWidget *w)
{
    bool customize =  (flags & (Qt::CustomizeWindowHint
            | Qt::FramelessWindowHint
            | Qt::WindowTitleHint
            | Qt::WindowSystemMenuHint
            | Qt::WindowMinimizeButtonHint
            | Qt::WindowMaximizeButtonHint
            | Qt::WindowContextHelpButtonHint));

    uint type = (flags & Qt::WindowType_Mask);

    if ((type == Qt::Widget || type == Qt::SubWindow) && w && !w->parent()) {
        type = Qt::Window;
        flags |= Qt::Window;
    }

    if (customize)
        ;
    else if (type == Qt::Dialog || type == Qt::Sheet)
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowContextHelpButtonHint;
    else if (type == Qt::Tool)
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint;
    else
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint;


}

void QWidgetPrivate::init(QWidget *parentWidget, Qt::WindowFlags f)
{
    Q_Q(QWidget);
    if (qApp->type() == QApplication::Tty)
        qFatal("QWidget: Cannot create a QWidget when no GUI is being used");

    Q_ASSERT(uncreatedWidgets);
    uncreatedWidgets->insert(q);

    QWidget *desktopWidget = 0;
    if (parentWidget && parentWidget->windowType() == Qt::Desktop) {
        desktopWidget = parentWidget;
        parentWidget = 0;
    }

    q->data = &data;

#ifndef QT_NO_THREAD
    if (!q->parent()) {
        Q_ASSERT_X(q->thread() == qApp->thread(), "QWidget",
                   "Widgets must be created in the GUI thread.");
    }
#endif

#if defined(Q_WS_X11)
    if (desktopWidget) {
        // make sure the widget is created on the same screen as the
        // programmer specified desktop widget
        xinfo = desktopWidget->d_func()->xinfo;
    }
#else
    Q_UNUSED(desktopWidget);
#endif

    data.fstrut_dirty = true;

    data.winid = 0;
    data.widget_attributes = 0;
    data.window_flags = f;
    data.window_state = 0;
    data.focus_policy = 0;
    data.context_menu_policy = Qt::DefaultContextMenu;
    data.window_modality = Qt::NonModal;

    data.sizehint_forced = 0;
    data.is_closing = 0;
    data.in_show = 0;
    data.in_set_window_state = 0;

    q->setAttribute(Qt::WA_QuitOnClose); // might be cleared in create()

    q->setAttribute(Qt::WA_WState_Hidden);

    //give potential windows a bigger "pre-initial" size; create_sys() will give them a new size later
    data.crect = parentWidget ? QRect(0,0,100,30) : QRect(0,0,640,480);

    focus_next = focus_prev = q;

    if ((f & Qt::WindowType_Mask) == Qt::Desktop)
        q->create();
    else if (parentWidget)
        q->setParent(parentWidget, data.window_flags);
    else {
        adjustFlags(data.window_flags, q);
        resolveLayoutDirection();
    }
#if defined(Q_WS_X11)
    data.fnt.x11SetScreen(xinfo.screen());
#endif // Q_WS_X11

    q->setAttribute(Qt::WA_PendingMoveEvent);
    q->setAttribute(Qt::WA_PendingResizeEvent);

    if (++QWidgetPrivate::instanceCounter > QWidgetPrivate::maxInstances)
        QWidgetPrivate::maxInstances = QWidgetPrivate::instanceCounter;

    if (QApplicationPrivate::app_compile_version < 0x040200
        || QApplicationPrivate::testAttribute(Qt::AA_ImmediateWidgetCreation)
        || (f & Qt::X11BypassWindowManagerHint))
        q->create();


    QEvent e(QEvent::Create);
    QApplication::sendEvent(q, &e);
    QApplication::postEvent(q, new QEvent(QEvent::PolishRequest));

    extraPaintEngine = 0;
}



void QWidgetPrivate::createRecursively()
{
    Q_Q(QWidget);
    q->create(0, true, true);
    for (int i = 0; i < children.size(); ++i) {
        QWidget *child = qobject_cast<QWidget *>(children.at(i));
        if (child && !child->isHidden() && !child->isWindow() && !child->testAttribute(Qt::WA_WState_Created))
            child->d_func()->createRecursively();
    }
}




void QWidget::create(WId window, bool initializeWindow, bool destroyOldWindow)
{
    Q_D(QWidget);
    if (testAttribute(Qt::WA_WState_Created) && window == 0)
        return;

    Qt::WindowType type = windowType();
    Qt::WindowFlags &flags = data->window_flags;

    if ((type == Qt::Widget || type == Qt::SubWindow) && !parentWidget()) {
        type = Qt::Window;
        flags |= Qt::Window;
    }

    if (parentWidget() && (type & Qt::Window) && !parentWidget()->testAttribute(Qt::WA_WState_Created) && !isModal())
        parentWidget()->createWinId();

#ifdef QT3_SUPPORT
    if (flags & Qt::WStaticContents)
        setAttribute(Qt::WA_StaticContents);
    if (flags & Qt::WDestructiveClose)
  setAttribute(Qt::WA_DeleteOnClose);
    if (flags & Qt::WShowModal)
        setWindowModality(Qt::ApplicationModal);
    if (flags & Qt::WMouseNoMask)
  setAttribute(Qt::WA_MouseNoMask);
    if (flags & Qt::WGroupLeader)
  setAttribute(Qt::WA_GroupLeader);
    if (flags & Qt::WNoMousePropagation)
  setAttribute(Qt::WA_NoMousePropagation);
#endif

    if ( type != Qt::Widget && type != Qt::Window && type != Qt::Dialog)
        setAttribute(Qt::WA_QuitOnClose, false);

    setAttribute(Qt::WA_WState_Created);                        // set created flag
    d->create_sys(window, initializeWindow, destroyOldWindow);

    // a real toplevel window needs a backing store
#ifndef Q_WS_MAC
    if (isWindow()) {
        delete d->topData()->backingStore;
        d->topData()->backingStore = new QWidgetBackingStore(this);
    }
#endif

    d->setModal_sys();

    if (!isWindow() && parentWidget() && parentWidget()->testAttribute(Qt::WA_DropSiteRegistered))
        setAttribute(Qt::WA_DropSiteRegistered, true);

#ifdef QT_EVAL
    extern void qt_eval_init_widget(QWidget *w);
    qt_eval_init_widget(this);
#endif

    // need to force the resting of the icon after changing parents
    if (testAttribute(Qt::WA_SetWindowIcon))
        d->setWindowIcon_sys(true);
    if (isWindow() && !d->topData()->iconText.isEmpty())
        d->setWindowIconText_helper(d->topData()->iconText);
    if (windowType() != Qt::Desktop) {
        d->updateSystemBackground();

        if (isWindow() && !testAttribute(Qt::WA_SetWindowIcon))
            d->setWindowIcon_sys();
    }
    if (testAttribute(Qt::WA_WState_ExplicitShowHide) && testAttribute(Qt::WA_WState_Hidden))
        d->hide_helper();
}

QWidget::~QWidget()
{
    Q_D(QWidget);
#if defined (QT_CHECK_STATE)
    if (paintingActive())
        qWarning("QWidget: %s (%s) deleted while being painted", className(), name());
#endif

    // force acceptDrops false before winId is destroyed.
    d->registerDropSite(false);

#ifndef QT_NO_ACTION
    // remove all actions from this widget
    for (int i = 0; i < d->actions.size(); ++i) {
        QActionPrivate *apriv = d->actions.at(i)->d_func();
        apriv->widgets.removeAll(this);
    }
    d->actions.clear();
#endif

#ifndef QT_NO_SHORTCUT
    // Remove all shortcuts grabbed by this
    // widget, unless application is closing
    if (!QApplicationPrivate::is_app_closing && testAttribute(Qt::WA_GrabbedShortcut))
        qApp->d_func()->shortcutMap.removeShortcut(0, this, QKeySequence());
#endif

    // delete layout while we still are a valid widget
    delete d->layout;
    // Remove myself from focus list

    Q_ASSERT(d->focus_next->d_func()->focus_prev == this);
    Q_ASSERT(d->focus_prev->d_func()->focus_next == this);

    if (d->focus_next != this) {
        d->focus_next->d_func()->focus_prev = d->focus_prev;
        d->focus_prev->d_func()->focus_next = d->focus_next;
        d->focus_next = d->focus_prev = 0;
    }

#ifdef QT3_SUPPORT
    if (QApplicationPrivate::main_widget == this) {        // reset main widget
        QApplicationPrivate::main_widget = 0;
        qApp->quit();
    }
#endif

    clearFocus();

    if (isWindow() && isVisible() && internalWinId())
        hide();

    // set all QPointers for this object to zero
    QObjectPrivate::clearGuards(this);

    if (!d->children.isEmpty())
        d->deleteChildren();

    QApplication::removePostedEvents(this);

    destroy();                                        // platform-dependent cleanup

    --QWidgetPrivate::instanceCounter;

    if (QWidgetPrivate::uncreatedWidgets) // might have been deleted by ~QApplication
        QWidgetPrivate::uncreatedWidgets->remove(this);

    QEvent e(QEvent::Destroy);
    QCoreApplication::sendEvent(this, &e);
}

int QWidgetPrivate::instanceCounter = 0;  // Current number of widget instances
int QWidgetPrivate::maxInstances = 0;     // Maximum number of widget instances

void QWidgetPrivate::setWinId(WId id)                // set widget identifier
{
    Q_Q(QWidget);
    if (mapper && data.winid) {
        mapper->remove(data.winid);
        uncreatedWidgets->insert(q);
    }

    data.winid = id;
#if defined(Q_WS_X11)
    hd = id; // X11: hd == ident
#endif
    if (mapper && id) {
        mapper->insert(data.winid, q);
        uncreatedWidgets->remove(q);
    }
}

void QWidgetPrivate::createTLExtra()
{
    if (!extra)
        createExtra();
    if (!extra->topextra) {
        QTLWExtra* x = extra->topextra = new QTLWExtra;
        x->windowSurface = 0;
        x->opacity = 255;
        x->posFromMove = false;
        x->icon = 0;
        x->iconPixmap = 0;
        x->frameStrut.setCoords(0, 0, 0, 0);
        x->incw = x->inch = 0;
        x->basew = x->baseh = 0;
        x->normalGeometry = QRect(0,0,-1,-1);
#if defined(Q_WS_X11)
        x->embedded = 0;
        x->parentWinId = 0;
        x->spont_unmapped = 0;
        x->dnd = 0;
#endif
        x->savedFlags = 0;
#if defined(Q_WS_QWS)
        x->inPaintTransaction = false;
        x->backingStore = 0;
#if !defined(QT_NO_QWS_MANAGER)
        x->qwsManager = 0;
#endif
#endif
        createTLSysExtra();
#ifdef QWIDGET_EXTRA_DEBUG
    static int count = 0;
    qDebug() << "tlextra" << ++count;
#endif
    }
}

void QWidgetPrivate::createExtra()
{
    if (!extra) {                                // if not exists
        extra = new QWExtra;
        extra->minw = extra->minh = 0;
        extra->maxw = extra->maxh = QWIDGETSIZE_MAX;
        extra->explicitMinSize = 0;
        extra->autoFillBackground = 0;
#ifndef QT_NO_CURSOR
        extra->curs = 0;
#endif
        extra->style = 0;
        extra->topextra = 0;
        createSysExtra();
#ifdef QWIDGET_EXTRA_DEBUG
    static int count = 0;
    qDebug() << "extra" << ++count;
#endif
    }
}


void QWidgetPrivate::deleteExtra()
{
    if (extra) {                                // if exists
#ifndef QT_NO_CURSOR
        delete extra->curs;
#endif
        deleteSysExtra();
        if (extra->topextra) {
            deleteTLSysExtra();
            delete extra->topextra->icon;
            delete extra->topextra->iconPixmap;
#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER)
            delete extra->topextra->qwsManager;
#endif
            delete extra->topextra;
        }
        delete extra;
        // extra->xic destroyed in QWidget::destroy()
        extra = 0;
    }
}

/*
  Returns true if the background is inherited; otherwise returns
  false.

  Mainly used in the paintOnScreen case.
*/

bool QWidgetPrivate::isBackgroundInherited() const
{
    Q_Q(const QWidget);

    // windows do not inherit their background
    if (q->isWindow() || q->windowType() == Qt::SubWindow)
        return false;

    if (q->testAttribute(Qt::WA_NoSystemBackground) || q->testAttribute(Qt::WA_OpaquePaintEvent))
        return false;

    const QPalette &pal = q->palette();
    QPalette::ColorRole bg = q->backgroundRole();
    QBrush brush = pal.brush(bg);

    // non opaque brushes leaves us no choice, we must inherit
    if (!q->autoFillBackground() || !brush.isOpaque())
        return true;

    if (brush.style() == Qt::SolidPattern) {
        // the background is just a solid color. If there is no
        // propagated contents, then we claim as performance
        // optimization that it was not inheritet. This is the normal
        // case in standard Windows or Motif style.
        const QWidget *w = q->parentWidget();
        if (!w->d_func()->isBackgroundInherited())
            return false;
    }

    return true;
}

#ifndef Q_WS_MAC
/*
  Returns true if there are widgets above this which overlap with
  \a rect, which is in parent's coordinate system (same as crect).
*/

bool QWidgetPrivate::isOverlapped(const QRect &rect) const
{
    Q_Q(const QWidget);

    const QWidget *w = q;
    QRect r = rect;
    while (w) {
        if (w->isWindow())
            return false;
        QWidgetPrivate *pd = w->parentWidget()->d_func();
        bool above = false;
        for (int i = 0; i < pd->children.size(); ++i) {
            QWidget *sibling = qobject_cast<QWidget *>(pd->children.at(i));
            if (!sibling || !sibling->isVisible() || sibling->isWindow())
                continue;
            if (!above) {
                above = (sibling == w);
                continue;
            }
            if (sibling->data->crect.intersects(r))
                return true;
        }
        w = w->parentWidget();
        r.translate(pd->data.crect.topLeft());
    }
    return false;
}
#endif

void QWidgetPrivate::setUpdatesEnabled_helper(bool enable)
{
    Q_Q(QWidget);

    if (enable && !q->isWindow() && q->parentWidget() && !q->parentWidget()->updatesEnabled())
        return; // nothing we can do

    if (enable != q->testAttribute(Qt::WA_UpdatesDisabled))
        return; // nothing to do

    q->setAttribute(Qt::WA_UpdatesDisabled, !enable);
    if (enable)
        q->update();

    Qt::WidgetAttribute attribute = enable ? Qt::WA_ForceUpdatesDisabled : Qt::WA_UpdatesDisabled;
    for (int i = 0; i < children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(children.at(i));
        if (w && !w->isWindow() && !w->testAttribute(attribute))
            w->d_func()->setUpdatesEnabled_helper(enable);
    }
}

void QWidgetPrivate::propagatePaletteChange()
{
    Q_Q(QWidget);
    QEvent pc(QEvent::PaletteChange);
    QApplication::sendEvent(q, &pc);
    if(!children.isEmpty()) {
        for(int i = 0; i < children.size(); ++i) {
            QWidget *w = qobject_cast<QWidget*>(children.at(i));
            if (w && (!w->isWindow()
                      || w->testAttribute(Qt::WA_WindowPropagation)))
                w->d_func()->resolvePalette();
        }
    }
#if defined(QT3_SUPPORT)
    q->paletteChange(q->palette()); // compatibility
#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;
}

#ifdef QT_EXPERIMENTAL_REGIONS
void QWidgetPrivate::setDirtyOpaqueRegion()
{
    Q_Q(QWidget);

    dirtyOpaqueChildren = true;

    QWidget *parent = q->parentWidget();
    if (!parent || parent->isWindow())
        return;

    // TODO: instead of setting dirtyflag, manipulate the dirtyregion directly?
    QWidgetPrivate *pd = parent->d_func();
    if (!pd->dirtyOpaqueChildren)
        pd->setDirtyOpaqueRegion();
}

QRegion QWidgetPrivate::getOpaqueRegion() const
{
    Q_Q(const QWidget);

    QRegion clip = q->rect();
    if (extra && !extra->mask.isEmpty())
        clip &= extra->mask;

    if (isOpaque())
        return clip;

    return getOpaqueChildren();
}

QRegion QWidgetPrivate::getOpaqueChildren() const
{
    if (!dirtyOpaqueChildren)
        return opaqueChildren;

    opaqueChildren = QRegion();

    for (int i = 0; i < children.size(); ++i) {
        QWidget *child = qobject_cast<QWidget *>(children.at(i));
        if (!child || !child->isVisible() || child->isWindow())
            continue;

        const QPoint offset = child->geometry().topLeft();
        opaqueChildren += child->d_func()->getOpaqueRegion().translated(offset);
    }

    dirtyOpaqueChildren = false;

    return opaqueChildren;
}

void QWidgetPrivate::subtractOpaqueChildren(QRegion &rgn, const QRegion &clipRgn, const QPoint &offset, int startIdx) const
{
    Q_UNUSED(startIdx);

    const QRegion r = getOpaqueChildren();
    if (!r.isEmpty())
        rgn -= (r.translated(offset) & clipRgn);
}


void QWidgetPrivate::subtractOpaqueSiblings(QRegion &rgn, const QPoint &offset) const
{
    Q_UNUSED(rgn);
    Q_UNUSED(offset);
}

#else
void QWidgetPrivate::subtractOpaqueChildren(QRegion &rgn, const QRegion &clipRgn, const QPoint &offset, int startIdx) const
{
    for (int i=startIdx; 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());
            }
        }
    }
}

//subtract any relatives that are higher up than me --- is this too expensive ???

void QWidgetPrivate::subtractOpaqueSiblings(QRegion &rgn, const QPoint &offset) const
{
    Q_Q(const QWidget);

    if (q->isWindow())
        return;

    QPoint myOffset = offset - q->data->crect.topLeft();
    const QWidgetPrivate *pd = q->parentWidget()->d_func();
    pd->subtractOpaqueSiblings(rgn, myOffset);
    int idx = pd->children.indexOf(const_cast<QWidget*>(q)) + 1; // argh, list<QObject*> is not compatible with const QObject*
    pd->subtractOpaqueChildren(rgn, q->rect(), myOffset, idx);
}

#endif // QT_EXPERIMENTAL_REGIONS

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();
}

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

}

#ifdef Q_WS_MAC
/*
  Fills \a buf with \a r in \a widget. Then blits \a buf on \a res at
  position \a offset
 */
void QPixmap::grabWidget_helper(QWidget *widget, QPixmap &res, QPixmap &buf,
                                const QRect &r, const QPoint &offset, bool asRoot)
{
    if(asRoot || widget->d_func()->hasBackground()) {
        buf.fill(widget, r.topLeft());
    } else {
        QPainter p(&buf);
        p.drawPixmap(0, 0, res, r.x()+offset.x(), r.y()+offset.y(), r.width(), r.height());
    }

    QPainter::setRedirected(widget, &buf, r.topLeft());
    QPaintEvent e(r & widget->rect());
    QApplication::sendEvent(widget, &e);
    QPainter::restoreRedirected(widget);
    {
        QPainter pt(&res);
        pt.drawPixmap(offset.x(), offset.y(), buf, 0, 0, r.width(), r.height());
    }

    const QObjectList children = widget->children();
    for (int i = 0; i < children.size(); ++i) {
        QWidget *child = static_cast<QWidget*>(children.at(i));
        if (!child->isWidgetType() || child->isWindow()
            || child->isHidden() || !child->geometry().intersects(r))
            continue;
        QRect cr = r & child->geometry();
        cr.translate(-child->pos());
        grabWidget_helper(child, res, buf, cr, offset + child->pos(), false);
    }
}
#endif

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);
    }
}


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;
}


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



WId QWidget::winId() const
{
    if (!testAttribute(Qt::WA_WState_Created)) {
        QWidget *that = const_cast<QWidget*>(this);
        that->d_func()->createWinId();
        return that->data->winid;
    }
    return data->winid;
}


void QWidgetPrivate::createWinId(WId winid)
{
    Q_Q(QWidget);
    if (!q->testAttribute(Qt::WA_WState_Created)) {
        if (!q->isWindow()) {
            QWidgetPrivate *pd = q->parentWidget()->d_func();
            if (!q->parentWidget()->testAttribute(Qt::WA_WState_Created))
                pd->createWinId();

            for (int i = 0; i < pd->children.size(); ++i) {
                QWidget *w = qobject_cast<QWidget *>(pd->children.at(i));
                if (w && !w->isWindow() && !w->testAttribute(Qt::WA_WState_Created))
                    if (w!=q) {
                        w->create();
                    } else {
                        w->create(winid);
                        // if the window has already been created, we
                        // need to raise it to its proper stacking position
                        if (winid)
                            w->raise();
                    }
            }
        } else {
            q->create();
        }
    }
}


void QWidget::createWinId()
{
    Q_D(QWidget);
//    qWarning("QWidget::createWinId is obsolete, please fix your code.");
    d->createWinId();
}

#ifndef QT_NO_STYLE_STYLESHEET

QString QWidget::styleSheet() const
{
    Q_D(const QWidget);
    if (!d->extra)
        return QString();
    return d->extra->styleSheet;
}

void QWidget::setStyleSheet(const QString& styleSheet)
{
    Q_D(QWidget);
    d->createExtra();

    QStyleSheetStyle *proxy = qobject_cast<QStyleSheetStyle *>(d->extra->style);
    d->extra->styleSheet = styleSheet;
    if (styleSheet.isEmpty()) { // stylesheet removed
        if (!proxy) {
            if (qApp->styleSheet().isEmpty())
                return; // no stylesheet here or on the app. what's the story?
            // will go down and set the right style
        } else {
            // we had a proxy before but now our stylesheet is empty. recheck if we need a proxy
            d->inheritStyle();
            return;
        }
    }

    if (proxy) { // style sheet update
        proxy->repolish(this);
        return;
    }

    if (testAttribute(Qt::WA_SetStyle)) {
        d->setStyle_helper(new QStyleSheetStyle(d->extra->style), true);
    } else if (QStyleSheetStyle *appProxy = qobject_cast<QStyleSheetStyle *>(qApp->style())) {
        appProxy->repolish(this);
    } else {
        d->setStyle_helper(new QStyleSheetStyle(0), true);
    }
}

#endif // QT_NO_STYLE_STYLESHEET

QStyle *QWidget::style() const
{
    Q_D(const QWidget);

    if (d->extra && d->extra->style)
        return d->extra->style;
    return qApp->style();
}

void QWidget::setStyle(QStyle *style)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_SetStyle, style != 0);
    d->createExtra();
#ifndef QT_NO_STYLE_STYLESHEET
    // if we have an application stylesheet or have a proxy already, propagate
    if (qobject_cast<QStyleSheetStyle *>(d->extra->style) || !qApp->styleSheet().isEmpty())
        d->setStyle_helper(new QStyleSheetStyle(style), true);
    else
#endif
        d->setStyle_helper(style, false);
}

void QWidgetPrivate::setStyle_helper(QStyle *newStyle, bool propagate)
{
    Q_Q(QWidget);
    createExtra();
    QStyle *oldStyle  = q->style();
#ifndef QT_NO_STYLE_STYLESHEET
    QStyle *origStyle = extra->style;
#endif
    extra->style = newStyle;

    if (propagate) {
        for (int i = 0; i < children.size(); ++i) {
            QWidget *c = qobject_cast<QWidget*>(children.at(i));
            if (c)
                c->d_func()->inheritStyle();
        }
    }

    // repolish
    if (q->windowType() != Qt::Desktop && polished) {
        oldStyle->unpolish(q);
        q->style()->polish(q);
    }
    QEvent e(QEvent::StyleChange);
    QApplication::sendEvent(q, &e);
#ifdef QT3_SUPPORT
    q->styleChange(*oldStyle);
#endif

#ifndef QT_NO_STYLE_STYLESHEET
    // dereference the old stylesheet style
    if (QStyleSheetStyle *proxy = qobject_cast<QStyleSheetStyle *>(origStyle))
        proxy->deref();
#endif
}

// Inherits style from the current parent and propagates it as necessary
void QWidgetPrivate::inheritStyle()
{
#ifndef QT_NO_STYLE_STYLESHEET
    Q_Q(QWidget);

    QStyleSheetStyle *proxy = extra ? qobject_cast<QStyleSheetStyle *>(extra->style) : 0;

    if (!q->styleSheet().isEmpty()) {
        if (!proxy)
            proxy = qobject_cast<QStyleSheetStyle *>(qApp->style());
        // Since, we have a non-empty stylesheet, we are guaranteed that either we or the
        // the application is running a style sheet proxy
        Q_ASSERT(proxy);
        proxy->repolish(q);
        return;
    }

    // If we have stylesheet on app or parent has stylesheet style, we need
    // to be running a proxy
    QStyle *origStyle = proxy ? proxy->base : (extra ? extra->style : 0);
    QWidget *parent = q->parentWidget();
    QStyle *parentStyle = parent && parent->d_func()->extra ? parent->d_func()->extra->style : 0;
    if (!qApp->styleSheet().isEmpty() || qobject_cast<QStyleSheetStyle *>(parentStyle)) {
        QStyle *newStyle = parentStyle;
        if (q->testAttribute(Qt::WA_SetStyle))
            newStyle = new QStyleSheetStyle(origStyle);
        else if (QStyleSheetStyle *newProxy = qobject_cast<QStyleSheetStyle *>(newStyle))
            newProxy->ref();

        setStyle_helper(newStyle, true);
        return;
    }

    // So, we have no stylesheet on parent/app and we have an empty stylesheet
    // we just need our original style back
    if (origStyle == (extra ? extra->style : 0)) // is it any different?
        return;

    // We could have inherited the proxy from our parent (which has a custom style)
    // In such a case we need to start following the application style (i.e revert
    // the propagation behavior of QStyleSheetStyle)
    if (!q->testAttribute(Qt::WA_SetStyle))
        origStyle = 0;

    setStyle_helper(origStyle, true);
#endif // QT_NO_STYLE_STYLESHEET
}

#ifdef QT3_SUPPORT

QStyle* QWidget::setStyle(const QString &style)
{
    QStyle *s = QStyleFactory::create(style);
    setStyle(s);
    return s;
}
#endif

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));
}

bool QWidget::isMinimized() const
{ return data->window_state & Qt::WindowMinimized; }

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();
}

bool QWidget::isMaximized() const
{ return data->window_state & Qt::WindowMaximized; }



Qt::WindowStates QWidget::windowState() const
{
    return (Qt::WindowStates)data->window_state;
}

void QWidget::overrideWindowState(Qt::WindowStates newstate)
{
    QWindowStateChangeEvent e((Qt::WindowStates)data->window_state, true);
    data->window_state  = newstate;
    QApplication::sendEvent(this, &e);
}

bool QWidget::isFullScreen() const
{ return data->window_state & Qt::WindowFullScreen; }

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

    setWindowState((windowState() & ~(Qt::WindowMinimized | Qt::WindowMaximized))
                   | Qt::WindowFullScreen);
    show();
    activateWindow();
}

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

    setWindowState((windowState() & ~(Qt::WindowMinimized | Qt::WindowFullScreen))
                   | Qt::WindowMaximized);
    show();
}

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

    setWindowState(windowState() & ~(Qt::WindowMinimized
                                     | Qt::WindowMaximized
                                     | Qt::WindowFullScreen));
    show();
}

bool QWidget::isEnabledTo(QWidget* ancestor) const
{
    const QWidget * w = this;
    while (w && !w->testAttribute(Qt::WA_ForceDisabled)
            && !w->isWindow()
            && w->parentWidget()
            && w->parentWidget() != ancestor)
        w = w->parentWidget();
    return !w->testAttribute(Qt::WA_ForceDisabled);
}

#ifndef QT_NO_ACTION

void QWidget::addAction(QAction *action)
{
    insertAction(0, action);
}

void QWidget::addActions(QList<QAction*> actions)
{
    for(int i = 0; i < actions.count(); i++)
        insertAction(0, actions.at(i));
}

void QWidget::insertAction(QAction *before, QAction *action)
{
    if(!action) {
        qWarning("QWidget::insertAction: Attempt to insert null action");
        return;
    }

    Q_D(QWidget);
    if(d->actions.contains(action))
        removeAction(action);

    int pos = d->actions.indexOf(before);
    if (pos < 0) {
        before = 0;
        pos = d->actions.size();
    }
    d->actions.insert(pos, action);

    QActionPrivate *apriv = action->d_func();
    apriv->widgets.append(this);

    QActionEvent e(QEvent::ActionAdded, action, before);
    QApplication::sendEvent(this, &e);
}

void QWidget::insertActions(QAction *before, QList<QAction*> actions)
{
    for(int i = 0; i < actions.count(); ++i)
        insertAction(before, actions.at(i));
}

void QWidget::removeAction(QAction *action)
{
    if (!action)
        return;

    Q_D(QWidget);

    QActionPrivate *apriv = action->d_func();
    apriv->widgets.removeAll(this);

    if (d->actions.removeAll(action)) {
        QActionEvent e(QEvent::ActionRemoved, action);
        QApplication::sendEvent(this, &e);
    }
}

QList<QAction*> QWidget::actions() const
{
    Q_D(const QWidget);
    return d->actions;
}
#endif // QT_NO_ACTION

void QWidget::setEnabled(bool enable)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_ForceDisabled, !enable);
    d->setEnabled_helper(enable);
}

void QWidgetPrivate::setEnabled_helper(bool enable)
{
    Q_Q(QWidget);

    if (enable && !q->isWindow() && q->parentWidget() && !q->parentWidget()->isEnabled())
        return; // nothing we can do

    if (enable != q->testAttribute(Qt::WA_Disabled))
        return; // nothing to do

    q->setAttribute(Qt::WA_Disabled, !enable);
    updateSystemBackground();

    if (!enable && q->window()->focusWidget() == q) {
        bool parentIsEnabled = (!q->parentWidget() || q->parentWidget()->isEnabled());
        if (!parentIsEnabled || !q->focusNextChild())
            q->clearFocus();
    }

    Qt::WidgetAttribute attribute = enable ? Qt::WA_ForceDisabled : Qt::WA_Disabled;
    for (int i = 0; i < children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(children.at(i));
        if (w && !w->testAttribute(attribute))
            w->d_func()->setEnabled_helper(enable);
    }
#if defined(Q_WS_X11)
    if (q->testAttribute(Qt::WA_SetCursor)) {
        // enforce the windows behavior of clearing the cursor on
        // disabled widgets
        extern void qt_x11_enforce_cursor(QWidget * w); // defined in qwidget_x11.cpp
        qt_x11_enforce_cursor(q);
    }
#endif
#ifdef Q_WS_WIN
    QWinInputContext::enable(q, q->testAttribute(Qt::WA_InputMethodEnabled) && enable);
#endif
    QEvent e(QEvent::EnabledChange);
    QApplication::sendEvent(q, &e);
#ifdef QT3_SUPPORT
    q->enabledChange(!enable); // compatibility
#endif
}

bool QWidget::acceptDrops() const
{
    return testAttribute(Qt::WA_AcceptDrops);
}

void QWidget::setAcceptDrops(bool on)
{
    setAttribute(Qt::WA_AcceptDrops, on);

}

void QWidget::setDisabled(bool disable)
{
    setEnabled(!disable);
}

QRect QWidget::frameGeometry() const
{
    Q_D(const QWidget);
    if (isWindow() && ! (windowType() == Qt::Popup)) {
        QRect fs = d->frameStrut();
        return QRect(data->crect.x() - fs.left(),
                     data->crect.y() - fs.top(),
                     data->crect.width() + fs.left() + fs.right(),
                     data->crect.height() + fs.top() + fs.bottom());
    }
    return data->crect;
}

int QWidget::x() const
{
    Q_D(const QWidget);
    if (isWindow() && ! (windowType() == Qt::Popup))
        return data->crect.x() - d->frameStrut().left();
    return data->crect.x();
}

int QWidget::y() const
{
    Q_D(const QWidget);
    if (isWindow() && ! (windowType() == Qt::Popup))
        return data->crect.y() - d->frameStrut().top();
    return data->crect.y();
}

QPoint QWidget::pos() const
{
    Q_D(const QWidget);
    if (isWindow() && ! (windowType() == Qt::Popup)) {
        QRect fs = d->frameStrut();
        return QPoint(data->crect.x() - fs.left(), data->crect.y() - fs.top());
    }
    return data->crect.topLeft();
}

QRect QWidget::normalGeometry() const
{
    Q_D(const QWidget);
    if (!d->extra || !d->extra->topextra)
        return QRect();

    if (!isMaximized() && !isFullScreen())
        return geometry();

    return d->topData()->normalGeometry;
}


QRect QWidget::childrenRect() const
{
    Q_D(const QWidget);
    QRect r(0, 0, 0, 0);
    for (int i = 0; i < d->children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(d->children.at(i));
        if (w && !w->isWindow() && !w->isHidden())
            r |= w->geometry();
    }
    return r;
}

QRegion QWidget::childrenRegion() const
{
    Q_D(const QWidget);
    QRegion r;
    for (int i = 0; i < d->children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget *>(d->children.at(i));
        if (w && !w->isWindow() && !w->isHidden()) {
            QRegion mask = w->mask();
            if (mask.isEmpty())
                r |= w->geometry();
            else
                r |= mask.translated(w->pos());
        }
    }
    return r;
}


QSize QWidget::minimumSize() const
{
    Q_D(const QWidget);
    return d->extra ? QSize(d->extra->minw, d->extra->minh) : QSize(0, 0);
}

QSize QWidget::maximumSize() const
{
    Q_D(const QWidget);
    return d->extra ? QSize(d->extra->maxw, d->extra->maxh)
                 : QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
}


QSize QWidget::sizeIncrement() const
{
    Q_D(const QWidget);
    return (d->extra && d->extra->topextra)
        ? QSize(d->extra->topextra->incw, d->extra->topextra->inch)
        : QSize(0, 0);
}

QSize QWidget::baseSize() const
{
    Q_D(const QWidget);
    return (d->extra != 0 && d->extra->topextra != 0)
        ? QSize(d->extra->topextra->basew, d->extra->topextra->baseh)
        : QSize(0, 0);
}

bool QWidgetPrivate::setMinimumSize_helper(int minw, int minh)
{
    Q_Q(QWidget);

#ifdef Q_WS_QWS
    if (q->isWindow()) {
        QApplicationPrivate *ap = QApplicationPrivate::instance();
        const QRect maxWindowRect = ap->maxWindowRect(getScreen());
        if (!maxWindowRect.isEmpty()) {
            // ### This is really just a work-around. Layout shouldn't be
            // asking for minimum sizes bigger than the screen.
            if (minw > maxWindowRect.width())
                minw = maxWindowRect.width();
            if (minh > maxWindowRect.height())
                minh = maxWindowRect.height();
        }
    }
#endif
    if (minw > QWIDGETSIZE_MAX || minh > QWIDGETSIZE_MAX) {
        qWarning("QWidget::setMinimumSize: (%s/%s) "
                "The largest allowed size is (%d,%d)",
                 q->objectName().toLocal8Bit().data(), q->metaObject()->className(), QWIDGETSIZE_MAX,
                QWIDGETSIZE_MAX);
        minw = qMin<int>(minw, QWIDGETSIZE_MAX);
        minh = qMin<int>(minh, QWIDGETSIZE_MAX);
    }
    if (minw < 0 || minh < 0) {
        qWarning("QWidget::setMinimumSize: (%s/%s) Negative sizes (%d,%d) "
                "are not possible",
                q->objectName().toLocal8Bit().data(), q->metaObject()->className(), minw, minh);
        minw = qMax(minw, 0);
        minh = qMax(minh, 0);
    }
    createExtra();
    if (extra->minw == minw && extra->minh == minh)
        return false;
    extra->minw = minw;
    extra->minh = minh;
    extra->explicitMinSize = (minw ? Qt::Horizontal : 0) | (minh ? Qt::Vertical : 0);
    return true;
}

void QWidget::setMinimumSize(int minw, int minh)
{
    Q_D(QWidget);
    if (!d->setMinimumSize_helper(minw, minh))
        return;

    if (isWindow())
        d->setConstraints_sys();
    if (minw > width() || minh > height()) {
        bool resized = testAttribute(Qt::WA_Resized);
        bool maximized = isMaximized();
        resize(qMax(minw,width()), qMax(minh,height()));
        setAttribute(Qt::WA_Resized, resized); //not a user resize
        if (maximized)
            data->window_state = data->window_state | Qt::WindowMaximized;
    }

    updateGeometry();
}

bool QWidgetPrivate::setMaximumSize_helper(int maxw, int maxh)
{
    Q_Q(QWidget);
    if (maxw > QWIDGETSIZE_MAX || maxh > QWIDGETSIZE_MAX) {
        qWarning("QWidget::setMaximumSize: (%s/%s) "
                "The largest allowed size is (%d,%d)",
                 q->objectName().toLocal8Bit().data(), q->metaObject()->className(), QWIDGETSIZE_MAX,
                QWIDGETSIZE_MAX);
        maxw = qMin<int>(maxw, QWIDGETSIZE_MAX);
        maxh = qMin<int>(maxh, QWIDGETSIZE_MAX);
    }
    if (maxw < 0 || maxh < 0) {
        qWarning("QWidget::setMaximumSize: (%s/%s) Negative sizes (%d,%d) "
                "are not possible",
                q->objectName().toLocal8Bit().data(), q->metaObject()->className(), maxw, maxh);
        maxw = qMax(maxw, 0);
        maxh = qMax(maxh, 0);
    }
    createExtra();
    if (extra->maxw == maxw && extra->maxh == maxh)
        return false;
    extra->maxw = maxw;
    extra->maxh = maxh;
    return true;
}

void QWidget::setMaximumSize(int maxw, int maxh)
{
    Q_D(QWidget);
    if (!d->setMaximumSize_helper(maxw, maxh))
        return;

    if (isWindow())
        d->setConstraints_sys();
    if (maxw < width() || maxh < height()) {
        bool resized = testAttribute(Qt::WA_Resized);
        resize(qMin(maxw,width()), qMin(maxh,height()));
        setAttribute(Qt::WA_Resized, resized); //not a user resize
    }

    updateGeometry();
}

void QWidget::setSizeIncrement(int w, int h)
{
    Q_D(QWidget);
    d->createTLExtra();
    QTLWExtra* x = d->topData();
    if (x->incw == w && x->inch == h)
        return;
    x->incw = w;
    x->inch = h;
    if (isWindow())
        d->setConstraints_sys();
}

void QWidget::setBaseSize(int basew, int baseh)
{
    Q_D(QWidget);
    d->createTLExtra();
    QTLWExtra* x = d->topData();
    if (x->basew == basew && x->baseh == baseh)
        return;
    x->basew = basew;
    x->baseh = baseh;
    if (isWindow())
        d->setConstraints_sys();
}

void QWidget::setFixedSize(const QSize & s)
{
    setFixedSize(s.width(), s.height());
}


void QWidget::setFixedSize(int w, int h)
{
    Q_D(QWidget);
    bool minSizeSet = d->setMinimumSize_helper(w, h);
    bool maxSizeSet = d->setMaximumSize_helper(w, h);
    if (!minSizeSet && !maxSizeSet)
        return;

    if (isWindow())
        d->setConstraints_sys();

    resize(w, h);
}

void QWidget::setMinimumWidth(int w)
{
    Q_D(QWidget);
    d->createExtra();
    uint expl = d->extra->explicitMinSize | (w ? Qt::Horizontal : 0);
    setMinimumSize(w, minimumSize().height());
    d->extra->explicitMinSize = expl;
}

void QWidget::setMinimumHeight(int h)
{
    Q_D(QWidget);
    d->createExtra();
    uint expl = d->extra->explicitMinSize | (h ? Qt::Vertical : 0);
    setMinimumSize(minimumSize().width(), h);
    d->extra->explicitMinSize = expl;
}

void QWidget::setMaximumWidth(int w)
{
    setMaximumSize(w, maximumSize().height());
}

void QWidget::setMaximumHeight(int h)
{
    setMaximumSize(maximumSize().width(), h);
}

void QWidget::setFixedWidth(int w)
{
    Q_D(QWidget);
    d->createExtra();
    uint expl = d->extra->explicitMinSize | Qt::Horizontal;
    setMinimumSize(w, minimumSize().height());
    setMaximumSize(w, maximumSize().height());
    d->extra->explicitMinSize = expl;
}


void QWidget::setFixedHeight(int h)
{
    Q_D(QWidget);
    d->createExtra();
    uint expl = d->extra->explicitMinSize | Qt::Vertical;
    setMinimumSize(minimumSize().width(), h);
    setMaximumSize(maximumSize().width(), h);
    d->extra->explicitMinSize = expl;
}


QPoint QWidget::mapTo(QWidget * parent, const QPoint & pos) const
{
    QPoint p = pos;
    if (parent) {
        const QWidget * w = this;
        while (w != parent) {
            Q_ASSERT_X(w, "QWidget::mapTo(QWidget *parent, const QPoint &pos)",
                       "parent must be in parent hierarchy");
            p = w->mapToParent(p);
            w = w->parentWidget();
        }
    }
    return p;
}


QPoint QWidget::mapFrom(QWidget * parent, const QPoint & pos) const
{
    QPoint p(pos);
    if (parent) {
        const QWidget * w = this;
        while (w != parent) {
            Q_ASSERT_X(w, "QWidget::mapFrom(QWidget *parent, const QPoint &pos)",
                       "parent must be in parent hierarchy");

            p = w->mapFromParent(p);
            w = w->parentWidget();
        }
    }
    return p;
}


QPoint QWidget::mapToParent(const QPoint &pos) const
{
    return pos + data->crect.topLeft();
}

QPoint QWidget::mapFromParent(const QPoint &pos) const
{
    return pos - data->crect.topLeft();
}


QWidget *QWidget::window() const
{
    QWidget *w = (QWidget *)this;
    QWidget *p = w->parentWidget();
    while (!w->isWindow() && p) {
        w = p;
        p = p->parentWidget();
    }
    return w;
}

#ifdef QT3_SUPPORT

Qt::BackgroundMode QWidget::backgroundMode() const
{
    if (testAttribute(Qt::WA_NoSystemBackground))
        return Qt::NoBackground;
    switch(backgroundRole()) {
    case QPalette::WindowText:
        return Qt::PaletteForeground;
    case QPalette::Button:
        return Qt::PaletteButton;
    case QPalette::Light:
        return Qt::PaletteLight;
    case QPalette::Midlight:
        return Qt::PaletteMidlight;
    case QPalette::Dark:
        return Qt::PaletteDark;
    case QPalette::Mid:
        return Qt::PaletteMid;
    case QPalette::Text:
        return Qt::PaletteText;
    case QPalette::BrightText:
        return Qt::PaletteBrightText;
    case QPalette::Base:
        return Qt::PaletteBase;
    case QPalette::Window:
        return Qt::PaletteBackground;
    case QPalette::Shadow:
        return Qt::PaletteShadow;
    case QPalette::Highlight:
        return Qt::PaletteHighlight;
    case QPalette::HighlightedText:
        return Qt::PaletteHighlightedText;
    case QPalette::ButtonText:
        return Qt::PaletteButtonText;
    case QPalette::Link:
        return Qt::PaletteLink;
    case QPalette::LinkVisited:
        return Qt::PaletteLinkVisited;
    default:
        break;
    }
    return Qt::NoBackground;
}

void QWidget::setBackgroundMode(Qt::BackgroundMode m, Qt::BackgroundMode)
{
    Q_D(QWidget);
    if(m == Qt::NoBackground) {
        setAttribute(Qt::WA_NoSystemBackground, true);
        return;
    }
    setAttribute(Qt::WA_NoSystemBackground, false);
    d->fg_role = QPalette::NoRole;
    QPalette::ColorRole role = d->bg_role;
    switch(m) {
    case Qt::FixedColor:
    case Qt::FixedPixmap:
        break;
    case Qt::PaletteForeground:
        role = QPalette::WindowText;
        break;
    case Qt::PaletteButton:
        role = QPalette::Button;
        break;
    case Qt::PaletteLight:
        role = QPalette::Light;
        break;
    case Qt::PaletteMidlight:
        role = QPalette::Midlight;
        break;
    case Qt::PaletteDark:
        role = QPalette::Dark;
        break;
    case Qt::PaletteMid:
        role = QPalette::Mid;
        break;
    case Qt::PaletteText:
        role = QPalette::Text;
        break;
    case Qt::PaletteBrightText:
        role = QPalette::BrightText;
        break;
    case Qt::PaletteBase:
        role = QPalette::Base;
        break;
    case Qt::PaletteBackground:
        role = QPalette::Window;
        break;
    case Qt::PaletteShadow:
        role = QPalette::Shadow;
        break;
    case Qt::PaletteHighlight:
        role = QPalette::Highlight;
        break;
    case Qt::PaletteHighlightedText:
        role = QPalette::HighlightedText;
        break;
    case Qt::PaletteButtonText:
        role = QPalette::ButtonText;
        break;
    case Qt::PaletteLink:
        role = QPalette::Link;
        break;
    case Qt::PaletteLinkVisited:
        role = QPalette::LinkVisited;
        break;
    case Qt::X11ParentRelative:
        d->fg_role = role = QPalette::NoRole;
    default:
        break;
    }
    setBackgroundRole(role);
}

QT3_SUPPORT QWidgetMapper *QWidget::wmapper() { return QWidgetPrivate::mapper; }

#endif


QPalette::ColorRole QWidget::backgroundRole() const
{

    const QWidget *w = this;
    do {
        QPalette::ColorRole role = w->d_func()->bg_role;
        if (role != QPalette::NoRole)
            return role;
        if (w->isWindow() || w->windowType() == Qt::SubWindow)
            break;
        w = w->parentWidget();
    } while (w);
    return QPalette::Window;
}

void QWidget::setBackgroundRole(QPalette::ColorRole role)
{
    Q_D(QWidget);
    d->bg_role = role;
    d->updateSystemBackground();
    d->propagatePaletteChange();
    d->updateIsOpaque();
}

QPalette::ColorRole QWidget::foregroundRole() const
{
    Q_D(const QWidget);
    QPalette::ColorRole rl = QPalette::ColorRole(d->fg_role);
    if (rl != QPalette::NoRole)
        return rl;
    QPalette::ColorRole role = QPalette::WindowText;
    switch (backgroundRole()) {
    case QPalette::Button:
        role = QPalette::ButtonText;
        break;
    case QPalette::Base:
        role = QPalette::Text;
        break;
    case QPalette::Dark:
    case QPalette::Shadow:
        role = QPalette::Light;
        break;
    case QPalette::Highlight:
        role = QPalette::HighlightedText;
        break;
    default:
        ;
    }
    return role;
}

void QWidget::setForegroundRole(QPalette::ColorRole role)
{
    Q_D(QWidget);
    d->fg_role = role;
    d->updateSystemBackground();
    d->propagatePaletteChange();
}

const QPalette &QWidget::palette() const
{
    if (!isEnabled()) {
        data->pal.setCurrentColorGroup(QPalette::Disabled);
    } else if (!isVisible() || isActiveWindow()) {
        data->pal.setCurrentColorGroup(QPalette::Active);
    } else {
#ifdef Q_WS_MAC
        extern bool qt_mac_can_clickThrough(const QWidget *); //qwidget_mac.cpp
        if (qt_mac_can_clickThrough(this))
            data->pal.setCurrentColorGroup(QPalette::Active);
        else
#endif
            data->pal.setCurrentColorGroup(QPalette::Inactive);
    }
    return data->pal;
}

void QWidget::setPalette(const QPalette &palette)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_SetPalette, palette.resolve() != 0);
    d->setPalette_helper(palette.resolve(qt_naturalWidgetPalette(this)));
}

void QWidgetPrivate::resolvePalette()
{
    Q_Q(QWidget);
    setPalette_helper(data.pal.resolve(qt_naturalWidgetPalette(q)));
}

void QWidgetPrivate::setPalette_helper(const QPalette &palette)
{
    Q_Q(QWidget);
    if (data.pal == palette && data.pal.resolve() == palette.resolve())
        return;
    data.pal = palette;
    updateSystemBackground();
    propagatePaletteChange();
    updateIsOpaque();
    q->update();
    updateIsOpaque();
}


void QWidget::setFont(const QFont &font)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_SetFont, font.resolve() != 0);
    d->setFont_helper(font.resolve(qt_naturalWidgetFont(this)));
}

void QWidgetPrivate::resolveFont()
{
    Q_Q(QWidget);
    setFont_helper(data.fnt.resolve(qt_naturalWidgetFont(q)));
}

void QWidgetPrivate::setFont_helper(const QFont &font)
{
    if (data.fnt == font && data.fnt.resolve() == font.resolve())
        return;

    Q_Q(QWidget);
#ifdef QT3_SUPPORT
    QFont old = data.fnt;
#endif
    data.fnt = font;
#if defined(Q_WS_X11)
    // make sure the font set on this widget is associated with the correct screen
    data.fnt.x11SetScreen(xinfo.screen());
#endif
    for (int i = 0; i < children.size(); ++i) {
        QWidget *w = qobject_cast<QWidget*>(children.at(i));
        if (w && (!w->isWindow()
                  || w->testAttribute(Qt::WA_WindowPropagation)))
            w->d_func()->resolveFont();
    }
    QEvent e(QEvent::FontChange);
    QApplication::sendEvent(q, &e);
#ifdef QT3_SUPPORT
    q->fontChange(old);
#endif
}

void QWidgetPrivate::setLayoutDirection_helper(Qt::LayoutDirection direction)
{
    Q_Q(QWidget);

    if ( (direction == Qt::RightToLeft) == q->testAttribute(Qt::WA_RightToLeft))
        return;
    q->setAttribute(Qt::WA_RightToLeft, (direction == Qt::RightToLeft));
    if (!children.isEmpty()) {
        for (int i = 0; i < children.size(); ++i) {
            QWidget *w = qobject_cast<QWidget*>(children.at(i));
            if (w && !w->isWindow() && !w->testAttribute(Qt::WA_SetLayoutDirection))
                w->d_func()->setLayoutDirection_helper(direction);
        }
    }
    QEvent e(QEvent::LayoutDirectionChange);
    QApplication::sendEvent(q, &e);
}

void QWidgetPrivate::resolveLayoutDirection()
{
    Q_Q(const QWidget);
    if (!q->testAttribute(Qt::WA_SetLayoutDirection))
        setLayoutDirection_helper(q->isWindow() ? QApplication::layoutDirection() : q->parentWidget()->layoutDirection());
}

void QWidget::setLayoutDirection(Qt::LayoutDirection direction)
{
    Q_D(QWidget);

    setAttribute(Qt::WA_SetLayoutDirection);
    d->setLayoutDirection_helper(direction);
}

Qt::LayoutDirection QWidget::layoutDirection() const
{
    return testAttribute(Qt::WA_RightToLeft) ? Qt::RightToLeft : Qt::LeftToRight;
}

void QWidget::unsetLayoutDirection()
{
    Q_D(QWidget);
    setAttribute(Qt::WA_SetLayoutDirection, false);
    d->resolveLayoutDirection();
}

#ifndef QT_NO_CURSOR
QCursor QWidget::cursor() const
{
    Q_D(const QWidget);
    if (testAttribute(Qt::WA_SetCursor))
        return (d->extra && d->extra->curs)
            ? *d->extra->curs
            : QCursor(Qt::ArrowCursor);
    if (isWindow() || !parentWidget())
        return QCursor(Qt::ArrowCursor);
    return parentWidget()->cursor();
}

void QWidget::setCursor(const QCursor &cursor)
{
    Q_D(QWidget);
// On Mac we must set the cursor even if it is the ArrowCursor.
#ifndef Q_WS_MAC
    if (cursor.shape() != Qt::ArrowCursor
        || (d->extra && d->extra->curs))
#endif
    {
        d->createExtra();
        delete d->extra->curs;
        d->extra->curs = new QCursor(cursor);
    }
    setAttribute(Qt::WA_SetCursor);
    d->setCursor_sys(cursor);
}

void QWidget::unsetCursor()
{
    Q_D(QWidget);
    if (d->extra) {
        delete d->extra->curs;
        d->extra->curs = 0;
    }
    if (!isWindow())
        setAttribute(Qt::WA_SetCursor, false);
    d->unsetCursor_sys();
}

#endif

QString QWidget::windowTitle() const
{
    Q_D(const QWidget);
    return d->extra && d->extra->topextra
        ? d->extra->topextra->caption
        : QString();
}

QString qt_setWindowTitle_helperHelper(const QString &title, QWidget *widget)
{
    Q_ASSERT(widget);

#ifdef QT_EVAL
    extern QString qt_eval_adapt_window_title(const QString &title);
    QString cap = qt_eval_adapt_window_title(title);
#else
    QString cap = title;
#endif

    QString placeHolder(QLatin1String("[*]"));

    int index = cap.indexOf(placeHolder);

    while (index != -1) {
        index += placeHolder.length();
        int count = 1;
        while (cap.indexOf(placeHolder, index) == index) {
            ++count;
            index += placeHolder.length();
        }

        if (count%2) { // odd number of [*] -> replace last one
            int lastIndex = cap.lastIndexOf(placeHolder, index - 1);
            if (widget->isWindowModified()
             && widget->style()->styleHint(QStyle::SH_TitleBar_ModifyNotification, 0, widget))
                cap.replace(lastIndex, 3, QWidget::tr("*"));
            else
                cap.replace(lastIndex, 3, QLatin1String(""));
        }

        index = cap.indexOf(placeHolder, index);
    }

    cap.replace(QLatin1String("[*][*]"), QLatin1String("[*]"));

    return cap;
}

void QWidgetPrivate::setWindowTitle_helper(const QString &title)
{
    Q_Q(QWidget);
    if (!q->testAttribute(Qt::WA_WState_Created))
        createWinId();
    setWindowTitle_sys(qt_setWindowTitle_helperHelper(title, q));
}

void QWidgetPrivate::setWindowIconText_helper(const QString &title)
{
    Q_Q(QWidget);
    if (q->testAttribute(Qt::WA_WState_Created))
        setWindowIconText_sys(qt_setWindowTitle_helperHelper(title, q));
}

void QWidget::setWindowIconText(const QString &iconText)
{
    if (QWidget::windowIconText() == iconText)
        return;

    Q_D(QWidget);
    d->topData()->iconText = iconText;
    d->setWindowIconText_helper(iconText);

    QEvent e(QEvent::IconTextChange);
    QApplication::sendEvent(this, &e);
}

void QWidget::setWindowTitle(const QString &title)
{
    if (QWidget::windowTitle() == title)
        return;

    Q_D(QWidget);
    d->topData()->caption = title;
    d->setWindowTitle_helper(title);

    QEvent e(QEvent::WindowTitleChange);
    QApplication::sendEvent(this, &e);
}

QIcon QWidget::windowIcon() const
{
    const QWidget *w = this;
    while (w) {
        const QWidgetPrivate *d = w->d_func();
        if (d->extra && d->extra->topextra && d->extra->topextra->icon)
            return *d->extra->topextra->icon;
        w = w->parentWidget();
    }
    return qApp->windowIcon();
}

void QWidget::setWindowIcon(const QIcon &icon)
{
    Q_D(QWidget);

    setAttribute(Qt::WA_SetWindowIcon, !icon.isNull());
    d->createTLExtra();

    if (!d->extra->topextra->icon)
        d->extra->topextra->icon = new QIcon();
    *d->extra->topextra->icon = icon;

    delete d->extra->topextra->iconPixmap;
    d->extra->topextra->iconPixmap = 0;

    d->setWindowIcon_sys();
    QEvent e(QEvent::WindowIconChange);
    QApplication::sendEvent(this, &e);
}


QString QWidget::windowIconText() const
{
    Q_D(const QWidget);
    return (d->extra && d->extra->topextra) ? d->extra->topextra->iconText : QString();
}

QString QWidget::windowRole() const
{
    Q_D(const QWidget);
    return (d->extra && d->extra->topextra) ? d->extra->topextra->role : QString();
}

void QWidget::setWindowRole(const QString &role)
{
#if defined(Q_WS_X11)
    Q_D(QWidget);
    d->topData()->role = role;
    d->setWindowRole(role.toUtf8().constData());
#else
    Q_UNUSED(role)
#endif
}

void QWidget::setFocusProxy(QWidget * w)
{
    Q_D(QWidget);
    if (!w && !d->extra)
        return;

    for (QWidget* fp  = w; fp; fp = fp->focusProxy()) {
        if (fp == this) {
            qWarning("QWidget: %s (%s) already in focus proxy chain", metaObject()->className(), objectName().toLocal8Bit().constData());
            return;
        }
    }

    d->createExtra();
    d->extra->focus_proxy = w;
}


QWidget * QWidget::focusProxy() const
{
    Q_D(const QWidget);
    return d->extra ? (QWidget *)d->extra->focus_proxy : 0;
}


bool QWidget::hasFocus() const
{
    const QWidget* w = this;
    while (w->d_func()->extra && w->d_func()->extra->focus_proxy)
        w = w->d_func()->extra->focus_proxy;
    return (QApplication::focusWidget() == w);
}

void QWidget::setFocus(Qt::FocusReason reason)
{
    if (!isEnabled())
        return;

    QWidget *f = this;
    while (f->d_func()->extra && f->d_func()->extra->focus_proxy)
        f = f->d_func()->extra->focus_proxy;

    if (QApplication::focusWidget() == f
#if defined(Q_WS_WIN)
        && GetFocus() == f->internalWinId()
#endif
       )
        return;

    QWidget *w = f;
    if (isHidden()) {
        while (w && w->isHidden()) {
            w->d_func()->focus_child = f;
            w = w->isWindow() ? 0 : w->parentWidget();
        }
    } else {
        while (w) {
            w->d_func()->focus_child = f;
            w = w->isWindow() ? 0 : w->parentWidget();
        }
    }

    if (f->isActiveWindow()) {
        QApplicationPrivate::setFocusWidget(f, reason);

#if defined(Q_WS_MAC)
        if (f->testAttribute(Qt::WA_WState_Created)) {
            extern WindowPtr qt_mac_window_for(const QWidget *w); //qwidget_mac.cpp
            extern HIViewRef qt_mac_hiview_for(const QWidget *w); //qwidget_mac.cpp
            SetKeyboardFocus(qt_mac_window_for(f), qt_mac_hiview_for(f), 1);
        }
#endif

#if defined(Q_WS_WIN)
        if (f->testAttribute(Qt::WA_WState_Created)) {
            if (!(f->window()->windowType() == Qt::Popup))
                SetFocus(f->internalWinId());
        } else {
#endif
#ifndef QT_NO_ACCESSIBILITY
            QAccessible::updateAccessibility(f, 0, QAccessible::Focus);
#endif
#if defined(Q_WS_WIN)
        }
#endif
    }
}

void QWidget::clearFocus()
{
    QWidget *w = this;
    while (w && w->d_func()->focus_child == this) {
        w->d_func()->focus_child = 0;
        w = w->isWindow() ? 0 : w->parentWidget();
    }
    if (hasFocus()) {
        QApplicationPrivate::setFocusWidget(0, Qt::OtherFocusReason);
#if defined(Q_WS_WIN)
        if (!(windowType() == Qt::Popup) && GetFocus() == internalWinId())
            SetFocus(0);
        else {
#endif
#ifndef QT_NO_ACCESSIBILITY
            QAccessible::updateAccessibility(this, 0, QAccessible::Focus);
#endif
#if defined(Q_WS_WIN)
        }
#endif
    }
}


bool QWidget::focusNextPrevChild(bool next)
{
    QWidget* p = parentWidget();
    bool isSubWindow = (windowType() == Qt::SubWindow);
    if (!isWindow() && !isSubWindow && p)
        return p->focusNextPrevChild(next);

    QWidget *w = QApplicationPrivate::focusNextPrevChild_helper(this, next);
    if (!w) return false;

    w->setFocus(next ? Qt::TabFocusReason : Qt::BacktabFocusReason);
    return true;
}

QWidget *QWidget::focusWidget() const
{
    return const_cast<QWidget *>(d_func()->focus_child);
}

QWidget *QWidget::nextInFocusChain() const
{
    return const_cast<QWidget *>(d_func()->focus_next);
}

bool QWidget::isActiveWindow() const
{
    QWidget *tlw = window();
    if(tlw == qApp->activeWindow() || (isVisible() && (tlw->windowType() == Qt::Popup)))
        return true;
#ifdef Q_WS_MAC
    { //check process
        Boolean compare;
        ProcessSerialNumber current, front;
        GetCurrentProcess(&current);
        GetFrontProcess(&front);
        if(SameProcess(&current, &front, &compare) == noErr && !compare)
            return false;
    }
    extern bool qt_mac_is_macdrawer(const QWidget *); //qwidget_mac.cpp
    if(qt_mac_is_macdrawer(tlw) &&
       tlw->parentWidget() && tlw->parentWidget()->isActiveWindow())
        return true;
#endif
    if(style()->styleHint(QStyle::SH_Widget_ShareActivation, 0, this)) {
        if(((tlw->windowType() == Qt::Dialog) || (tlw->windowType() == Qt::Tool)) &&
           !tlw->isModal() &&
           (!tlw->parentWidget() || tlw->parentWidget()->isActiveWindow()))
           return true;
        QWidget *w = qApp->activeWindow();
        while(w && ((tlw->windowType() == Qt::Dialog) || (tlw->windowType() == Qt::Tool)) &&
              !w->isModal() && w->parentWidget()) {
            w = w->parentWidget()->window();
            if(w == tlw)
                return true;
        }
    }
#if defined(Q_WS_WIN32)
    HWND active = GetActiveWindow();
    return active == tlw->internalWinId() || ::IsChild(active, tlw->internalWinId());
#else
    return false;
#endif
}

void QWidget::setTabOrder(QWidget* first, QWidget *second)
{
    if (!first || !second || first->focusPolicy() == Qt::NoFocus || second->focusPolicy() == Qt::NoFocus)
        return;

    QWidget *fp = first->focusProxy();
    if (fp) {
        // If first is redirected, set first to the last child of first
        // that can take keyboard focus so that second is inserted after
        // that last child, and the focus order within first is (more
        // likely to be) preserved.
        QList<QWidget *> l = qFindChildren<QWidget *>(first);
        for (int i = l.size()-1; i >= 0; --i) {
            QWidget * next = l.at(i);
            if (next->window() == fp->window()) {
                fp = next;
                if (fp->focusPolicy() != Qt::NoFocus)
                    break;
            }
        }
        first = fp;
    }


    if (QWidget *sp = second->focusProxy())
        second = sp;

//    QWidget *fp = first->d_func()->focus_prev;
    QWidget *fn = first->d_func()->focus_next;

    if (fn == second)
        return;

    QWidget *sp = second->d_func()->focus_prev;
    QWidget *sn = second->d_func()->focus_next;

    fn->d_func()->focus_prev = second;
    first->d_func()->focus_next = second;

    second->d_func()->focus_next = fn;
    second->d_func()->focus_prev = first;

    sp->d_func()->focus_next = sn;
    sn->d_func()->focus_prev = sp;


    Q_ASSERT(first->d_func()->focus_next->d_func()->focus_prev == first);
    Q_ASSERT(first->d_func()->focus_prev->d_func()->focus_next == first);

    Q_ASSERT(second->d_func()->focus_next->d_func()->focus_prev == second);
    Q_ASSERT(second->d_func()->focus_prev->d_func()->focus_next == second);
}

void QWidgetPrivate::reparentFocusWidgets(QWidget * oldtlw)
{
    Q_Q(QWidget);
    if (oldtlw == q->window())
        return; // nothing to do

    if(focus_child)
        focus_child->clearFocus();

    // separate the focus chain into new (children of myself) and old (the rest)
    QWidget *firstOld = 0;
    //QWidget *firstNew = q; //invariant
    QWidget *o = 0; // last in the old list
    QWidget *n = q; // last in the new list

    bool prevWasNew = true;
    QWidget *w = focus_next;

    //Note: for efficiency, we do not maintain the list invariant inside the loop
    //we append items to the relevant list, and we optimize by not changing pointers
    //when subsequent items are going into the same list.
    while (w  != q) {
        bool currentIsNew =  q->isAncestorOf(w);
        if (currentIsNew) {
            if (!prevWasNew) {
                //prev was old -- append to new list
                n->d_func()->focus_next = w;
                w->d_func()->focus_prev = n;
            }
            n = w;
        } else {
            if (prevWasNew) {
                //prev was new -- append to old list, if there is one
                if (o) {
                    o->d_func()->focus_next = w;
                    w->d_func()->focus_prev = o;
                } else {
                    // "create" the old list
                    firstOld = w;
                }
            }
            o = w;
        }
        w = w->d_func()->focus_next;
        prevWasNew = currentIsNew;
    }

    //repair the old list:
    if (firstOld) {
        o->d_func()->focus_next = firstOld;
        firstOld->d_func()->focus_prev = o;
    }

    if (!q->isWindow()) {
        QWidget *topLevel = q->window();
        //insert new chain into toplevel's chain

        QWidget *prev = topLevel->d_func()->focus_prev;

        topLevel->d_func()->focus_prev = n;
        prev->d_func()->focus_next = q;

        focus_prev = prev;
        n->d_func()->focus_next = topLevel;
    } else {
        //repair the new list
            n->d_func()->focus_next = q;
            focus_prev = n;
    }

}

int QWidgetPrivate::pointToRect(const QPoint &p, const QRect &r)
{
    int dx = 0;
    int dy = 0;
    if (p.x() < r.left())
        dx = r.left() - p.x();
    else if (p.x() > r.right())
        dx = p.x() - r.right();
    if (p.y() < r.top())
        dy = r.top() - p.y();
    else if (p.y() > r.bottom())
        dy = p.y() - r.bottom();
    return dx + dy;
}

QSize QWidget::frameSize() const
{
    Q_D(const QWidget);
    if (isWindow() && !(windowType() == Qt::Popup)) {
        QRect fs = d->frameStrut();
        return QSize(data->crect.width() + fs.left() + fs.right(),
                      data->crect.height() + fs.top() + fs.bottom());
    }
    return data->crect.size();
}

void QWidget::move(const QPoint &p)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_Moved);
    if (testAttribute(Qt::WA_WState_Created)) {
        d->setGeometry_sys(p.x() + geometry().x() - QWidget::x(),
                       p.y() + geometry().y() - QWidget::y(),
                       width(), height(), true);
#ifdef QT_EXPERIMENTAL_REGIONS
        d->setDirtyOpaqueRegion();
#endif
    } else {
        if (isWindow())
            d->topData()->posFromMove = true;
        data->crect.moveTopLeft(p); // no frame yet
        setAttribute(Qt::WA_PendingMoveEvent);
    }
}

void QWidget::resize(const QSize &s)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_Resized);
    if (testAttribute(Qt::WA_WState_Created)) {
        d->setGeometry_sys(geometry().x(), geometry().y(), s.width(), s.height(), false);
#ifdef QT_EXPERIMENTAL_REGIONS
        d->setDirtyOpaqueRegion();
#endif
    } else {
        data->crect.setSize(s);
        setAttribute(Qt::WA_PendingResizeEvent);
    }
}

void QWidget::setGeometry(const QRect &r)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_Resized);
    setAttribute(Qt::WA_Moved);
    if (testAttribute(Qt::WA_WState_Created)) {
        d->setGeometry_sys(r.x(), r.y(), r.width(), r.height(), true);
#ifdef QT_EXPERIMENTAL_REGIONS
        d->setDirtyOpaqueRegion();
#endif
    } else {
        if (isWindow())
            d->topData()->posFromMove = false;
        data->crect = r;
        setAttribute(Qt::WA_PendingMoveEvent);
        setAttribute(Qt::WA_PendingResizeEvent);
    }
}

QByteArray QWidget::saveGeometry() const
{
    QByteArray array;
    QDataStream stream(&array, QIODevice::WriteOnly);
    stream.setVersion(QDataStream::Qt_4_0);
    const quint32 magicNumber = 0x1D9D0CB;
    quint16 majorVersion = 1;
    quint16 minorVersion = 0;
    stream << magicNumber
           << majorVersion
           << minorVersion
           << frameGeometry()
           << normalGeometry()
           << qint32(QApplication::desktop()->screenNumber(this))
           << quint8(windowState() & Qt::WindowMaximized)
           << quint8(windowState() & Qt::WindowFullScreen);
    return array;
}

bool QWidget::restoreGeometry(const QByteArray &geometry)
{
    if (geometry.size() < 4)
        return false;
    QDataStream stream(geometry);
    stream.setVersion(QDataStream::Qt_4_0);

    const quint32 magicNumber = 0x1D9D0CB;
    quint32 storedMagicNumber;
    stream >> storedMagicNumber;
    if (storedMagicNumber != magicNumber)
        return false;

    const quint16 currentMajorVersion = 1;
    quint16 majorVersion = 0;
    quint16 minorVersion = 0;

    stream >> majorVersion >> minorVersion;

    if (majorVersion != currentMajorVersion)
        return false;
    // (Allow all minor versions.)

    QRect restoredFrameGeometry;
    QRect restoredNormalGeometry;
    qint32 restoredScreenNumber;
    quint8 maximized;
    quint8 fullScreen;

    stream >> restoredFrameGeometry
           >> restoredNormalGeometry
           >> restoredScreenNumber
           >> maximized
           >> fullScreen;

    const int frameHeight = 20;
    if (!restoredFrameGeometry.isValid())
        restoredFrameGeometry = QRect(QPoint(0,0), sizeHint());

    if (!restoredNormalGeometry.isValid())
        restoredNormalGeometry = QRect(QPoint(0, frameHeight), sizeHint());

    const QDesktopWidget * const desktop = QApplication::desktop();
    if (restoredScreenNumber >= desktop->numScreens())
        restoredScreenNumber = desktop->primaryScreen();

    const QRect availableGeometry = desktop->availableGeometry(restoredScreenNumber);

    // Modify the restored geometry if we are about to restore to coordinates
    // that would make the window "lost". This happens if:
    // - The restored geometry is completely oustside the available geometry
    // - The title bar is outside the available geometry.
    // - (Mac only) The window is higher than the available geometry. It must
    //   be possible to bring the size grip on screen by moving the window.
#ifdef Q_WS_MAC
    restoredFrameGeometry.setHeight(qMin(restoredFrameGeometry.height(), availableGeometry.height()));
    restoredNormalGeometry.setHeight(qMin(restoredNormalGeometry.height(), availableGeometry.height() - frameHeight));
#endif

    if (!restoredFrameGeometry.intersects(availableGeometry)) {
        restoredFrameGeometry.moveBottom(qMin(restoredFrameGeometry.bottom(), availableGeometry.bottom()));
        restoredFrameGeometry.moveLeft(qMax(restoredFrameGeometry.left(), availableGeometry.left()));
        restoredFrameGeometry.moveRight(qMin(restoredFrameGeometry.right(), availableGeometry.right()));
    }
    restoredFrameGeometry.moveTop(qMax(restoredFrameGeometry.top(), availableGeometry.top()));

    if (!restoredNormalGeometry.intersects(availableGeometry)) {
        restoredNormalGeometry.moveBottom(qMin(restoredNormalGeometry.bottom(), availableGeometry.bottom()));
        restoredNormalGeometry.moveLeft(qMax(restoredNormalGeometry.left(), availableGeometry.left()));
        restoredNormalGeometry.moveRight(qMin(restoredNormalGeometry.right(), availableGeometry.right()));
    }
    restoredNormalGeometry.moveTop(qMax(restoredNormalGeometry.top(), availableGeometry.top() + frameHeight));

    if (maximized || fullScreen) {
        setGeometry(restoredNormalGeometry);
        if (maximized)
            setWindowState(windowState() | Qt::WindowMaximized);
        if (fullScreen)
            setWindowState(windowState() | Qt::WindowFullScreen);
    } else {
        move(restoredFrameGeometry.topLeft());
        resize(restoredNormalGeometry.size());
    }
    return true;
}

void QWidget::setContentsMargins(int left, int top, int right, int bottom)
{
    Q_D(QWidget);
    if (left == d->leftmargin && top == d->topmargin
         && right == d->rightmargin && bottom == d->bottommargin)
        return;
    d->leftmargin = left;
    d->topmargin = top;
    d->rightmargin = right;
    d->bottommargin = bottom;

    if (QLayout *l=d->layout)
        l->update(); //force activate; will do updateGeometry
    else
        updateGeometry();

    if (isVisible()) {
        update();
        QResizeEvent e(data->crect.size(), data->crect.size());
        QApplication::sendEvent(this, &e);
    } else {
        setAttribute(Qt::WA_PendingResizeEvent, true);
    }
}

void QWidget::getContentsMargins(int *left, int *top, int *right, int *bottom) const
{
    Q_D(const QWidget);
    if (left)
        *left = d->leftmargin;
    if (top)
        *top = d->topmargin;
    if (right)
        *right = d->rightmargin;
    if (bottom)
        *bottom = d->bottommargin;
}

QRect QWidget::contentsRect() const
{
    Q_D(const QWidget);
    return QRect(QPoint(d->leftmargin, d->topmargin),
                 QPoint(data->crect.width() - 1 - d->rightmargin,
                        data->crect.height() - 1 - d->bottommargin));

}



Qt::ContextMenuPolicy QWidget::contextMenuPolicy() const
{
    return (Qt::ContextMenuPolicy)data->context_menu_policy;
}

void QWidget::setContextMenuPolicy(Qt::ContextMenuPolicy policy)
{
    data->context_menu_policy = (uint) policy;
}

Qt::FocusPolicy QWidget::focusPolicy() const
{
    return (Qt::FocusPolicy)data->focus_policy;
}

void QWidget::setFocusPolicy(Qt::FocusPolicy policy)
{
    data->focus_policy = (uint) policy;
}

void QWidget::setUpdatesEnabled(bool enable)
{
    Q_D(QWidget);
    setAttribute(Qt::WA_ForceUpdatesDisabled, !enable);
    d->setUpdatesEnabled_helper(enable);
}

void QWidgetPrivate::show_recursive()
{
    Q_Q(QWidget);
    // polish if necessary

    if (!q->testAttribute(Qt::WA_WState_Created))
        createRecursively();
    q->ensurePolished();

#ifdef QT3_SUPPORT
    if(sendChildEvents)
        QApplication::sendPostedEvents(q, QEvent::ChildInserted);
#endif
    if (!q->isWindow() && q->parentWidget()->d_func()->layout && !q->parentWidget()->data->in_show)
        q->parentWidget()->d_func()->layout->activate();
    // activate our layout before we and our children become visible
    if (layout)
        layout->activate();

    show_helper();
}

void QWidgetPrivate::show_helper()
{
    Q_Q(QWidget);
    data.in_show = true; // qws optimization
    // make sure we receive pending move and resize events
    if (q->testAttribute(Qt::WA_PendingMoveEvent)) {
        QMoveEvent e(data.crect.topLeft(), data.crect.topLeft());
        QApplication::sendEvent(q, &e);
        q->setAttribute(Qt::WA_PendingMoveEvent, false);
    }
    if (q->testAttribute(Qt::WA_PendingResizeEvent)) {
        QResizeEvent e(data.crect.size(), QSize());
        QApplication::sendEvent(q, &e);
        q->setAttribute(Qt::WA_PendingResizeEvent, false);
    }

    // become visible before showing all children
    q->setAttribute(Qt::WA_WState_Visible);

    // finally show all children recursively
    showChildren(false);

#ifdef QT3_SUPPORT
    if (q->parentWidget() && sendChildEvents)
        QApplication::sendPostedEvents(q->parentWidget(),
                                        QEvent::ChildInserted);
#endif


    // popup handling: new popups and tools need to be raised, and
    // existing popups must be closed. Also propagate the current
    // windows's KeyboardFocusChange status.
    if (q->isWindow()) {
        if ((q->windowType() == Qt::Tool) || (q->windowType() == Qt::Popup) || q->windowType() == Qt::ToolTip) {
            q->raise();
            if (q->parentWidget() && q->parentWidget()->window()->testAttribute(Qt::WA_KeyboardFocusChange))
                q->setAttribute(Qt::WA_KeyboardFocusChange);
        } else {
            while (QApplication::activePopupWidget()) {
                if (!QApplication::activePopupWidget()->close())
                    break;
            }
        }
    }

    // On Windows, show the popup now so that our own focus handling
    // stores the correct old focus widget even if it's stolen in the
    // showevent
#if defined(Q_WS_WIN)
    if ((q->windowType() == Qt::Popup))
        qApp->d_func()->openPopup(q);
#endif

    // send the show event before showing the window
    QShowEvent showEvent;
    QApplication::sendEvent(q, &showEvent);

    if (q->isModal())
        // QApplicationPrivate::enterModal *before* show, otherwise the initial
        // stacking might be wrong
        QApplicationPrivate::enterModal(q);


    show_sys();

#if !defined(Q_WS_WIN)
    if ((q->windowType() == Qt::Popup))
        qApp->d_func()->openPopup(q);
#endif

#ifndef QT_NO_ACCESSIBILITY
    QAccessible::updateAccessibility(q, 0, QAccessible::ObjectShow);
#endif

    data.in_show = false;  // reset qws optimization
}

void QWidgetPrivate::hide_helper()
{
    Q_Q(QWidget);
    if ((q->windowType() == Qt::Popup))
        qApp->d_func()->closePopup(q);

    // Move test modal here.  Otherwise, a modal dialog could get
    // destroyed and we lose all access to its parent because we haven't
    // left modality.  (Eg. modal Progress Dialog)
    if (q->isModal())
        QApplicationPrivate::leaveModal(q);

#if defined(Q_WS_WIN)
    if (q->isWindow() && !(q->windowType() == Qt::Popup) && q->parentWidget()
        && !q->parentWidget()->isHidden() && q->isActiveWindow())
        q->parentWidget()->activateWindow();        // Activate parent
#endif

    q->setAttribute(Qt::WA_Mapped, false);
    hide_sys();

    bool wasVisible = q->testAttribute(Qt::WA_WState_Visible);

    if (wasVisible) {
        q->setAttribute(Qt::WA_WState_Visible, false);

    }

    QHideEvent hideEvent;
    QApplication::sendEvent(q, &hideEvent);
    hideChildren(false);

    // next bit tries to move the focus if the focus widget is now
    // hidden.
    if (wasVisible) {
        QWidget *fw = QApplication::focusWidget();
        while (fw &&  !fw->isWindow()) {
            if (fw == q) {
                q->focusNextPrevChild(true);
                break;
            }
            fw = fw->parentWidget();
        }
    }


#ifndef QT_NO_ACCESSIBILITY
    if (wasVisible)
        QAccessible::updateAccessibility(q, 0, QAccessible::ObjectHide);
#endif
}

void QWidget::setVisible(bool visible)
{
    if (visible) { // show
        if (testAttribute(Qt::WA_WState_ExplicitShowHide) && !testAttribute(Qt::WA_WState_Hidden))
            return;

        Q_D(QWidget);

        // Designer uses a trick to make grabWidget work without showing
        if (!isWindow() && parentWidget() && parentWidget()->isVisible()
            && !parentWidget()->testAttribute(Qt::WA_WState_Created))
            parentWidget()->window()->d_func()->createRecursively();

        //we have to at least create toplevels before applyX11SpecificCommandLineArguments
        //but not children of non-visible parents
        QWidget *pw = parentWidget();
        if (!testAttribute(Qt::WA_WState_Created)
            && (isWindow() || pw->testAttribute(Qt::WA_WState_Created))) {
            create();
        }

#if defined(Q_WS_X11)
        if (windowType() == Qt::Window)
            QApplicationPrivate::applyX11SpecificCommandLineArguments(this);
#elif defined(Q_WS_QWS)
        if (windowType() == Qt::Window)
            QApplicationPrivate::applyQWSSpecificCommandLineArguments(this);
#endif

        bool wasResized = testAttribute(Qt::WA_Resized);
        Qt::WindowStates initialWindowState = windowState();

        // polish if necessary
        ensurePolished();

        // remember that show was called explicitly
        setAttribute(Qt::WA_WState_ExplicitShowHide);
        // whether we need to inform the parent widget immediately
        bool needUpdateGeometry = !isWindow() && testAttribute(Qt::WA_WState_Hidden);
        // we are no longer hidden
        setAttribute(Qt::WA_WState_Hidden, false);

        if (needUpdateGeometry)
            updateGeometry();

#ifdef QT3_SUPPORT
        QApplication::sendPostedEvents(this, QEvent::ChildInserted);
#endif
        // activate our layout before we and our children become visible
        if (d->layout)
            d->layout->activate();

        if (!isWindow()) {
            QWidget *parent = parentWidget();
            while (parent && parent->isVisible() && parent->d_func()->layout  && !parent->data->in_show) {
                parent->d_func()->layout->activate();
                if (parent->isWindow())
                    break;
                parent = parent->parentWidget();
            }
#ifdef QT_EXPERIMENTAL_REGIONS
            if (parent && !d->getOpaqueRegion().isEmpty())
                parent->d_func()->setDirtyOpaqueRegion();
#endif

        }

        // adjust size if necessary
        if (!wasResized
            && (isWindow() || !parentWidget()->d_func()->layout))  {
            if (isWindow()) {
                adjustSize();
                if (windowState() != initialWindowState)
                    setWindowState(initialWindowState);
            } else {
                adjustSize();
            }
            setAttribute(Qt::WA_Resized, false);
        }

        setAttribute(Qt::WA_KeyboardFocusChange, false);

        if (isWindow() || parentWidget()->isVisible())
            d->show_helper();

        QEvent showToParentEvent(QEvent::ShowToParent);
        QApplication::sendEvent(this, &showToParentEvent);
    } else { // hide
        if (testAttribute(Qt::WA_WState_ExplicitShowHide) && testAttribute(Qt::WA_WState_Hidden))
            return;

        Q_D(QWidget);
        setAttribute(Qt::WA_WState_Hidden);
        setAttribute(Qt::WA_WState_ExplicitShowHide);
        if (testAttribute(Qt::WA_WState_Created))
            d->hide_helper();

        // invalidate layout similar to updateGeometry()
        if (!isWindow() && parentWidget()) {
            if (parentWidget()->d_func()->layout)
                parentWidget()->d_func()->layout->update();
            else if (parentWidget()->isVisible())
                QApplication::postEvent(parentWidget(), new QEvent(QEvent::LayoutRequest));
#ifdef QT_EXPERIMENTAL_REGIONS
            if (!d->getOpaqueRegion().isEmpty())
                parentWidget()->d_func()->setDirtyOpaqueRegion();
#endif
        }

        QEvent hideToParentEvent(QEvent::HideToParent);
        QApplication::sendEvent(this, &hideToParentEvent);
    }
}

void QWidgetPrivate::_q_showIfNotHidden()
{
    Q_Q(QWidget);
    if ( !(q->isHidden() && q->testAttribute(Qt::WA_WState_ExplicitShowHide)) )
        q->setVisible(true);
}

void QWidgetPrivate::showChildren(bool spontaneous)
{
    QList<QObject*> childList = children;
    for (int i = 0; i < childList.size(); ++i) {
        QWidget *widget = qobject_cast<QWidget*>(childList.at(i));
        if (!widget
            || widget->isWindow()
            || widget->testAttribute(Qt::WA_WState_Hidden))
            continue;
        if (spontaneous) {
            widget-&