/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtGui module of the Qt Toolkit.
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** contained in the Technology Preview License Agreement accompanying
** this package.
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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**
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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****************************************************************************/

#include "qwidget.h"
#include "qevent.h"
#include "qapplication.h"
#include "private/qbackingstore_p.h"
#include "private/qwidget_p.h"
#include "private/qgraphicssystem_p.h"
#include "private/qapplication_p.h"

QT_BEGIN_NAMESPACE

void QWidgetPrivate::create_sys(WId window, bool initializeWindow, bool /*destroyOldWindow*/)
{
    Q_Q(QWidget);

    Q_UNUSED(window);
    Q_UNUSED(initializeWindow);
    // XXX


    Qt::WindowFlags flags = data.window_flags;

#if 1
    QWindowSurface *surface = q->windowSurface();
    if (surface && (flags & Qt::Window))
      data.window_flags = surface->setWindowFlags(data.window_flags);
#endif
//    qDebug() << "create_sys" << q;
}

void QWidget::destroy(bool destroyWindow, bool destroySubWindows)
{
    Q_UNUSED(destroyWindow);
    Q_UNUSED(destroySubWindows);
    // XXX


    if ((windowType() == Qt::Popup))
        qApp->d_func()->closePopup(this);

}

void QWidgetPrivate::setParent_sys(QWidget *newparent, Qt::WindowFlags f)
{
    Q_Q(QWidget);


    QWidget *oldParent = q->parentWidget();
    Qt::WindowFlags oldFlags = data.window_flags;
    if (parent != newparent) {
        QObjectPrivate::setParent_helper(newparent); //### why does this have to be done in the _sys function???

    }
    if (!newparent) {
        f |= Qt::Window;
    }

    bool explicitlyHidden = q->testAttribute(Qt::WA_WState_Hidden) && q->testAttribute(Qt::WA_WState_ExplicitShowHide);

    data.window_flags = f;
    q->setAttribute(Qt::WA_WState_Created, false);
    q->setAttribute(Qt::WA_WState_Visible, false);
    q->setAttribute(Qt::WA_WState_Hidden, false);

    if (f & Qt::Window) {
        //qDebug() << "setParent_sys" << q << newparent << hex << f;
        if (QWindowSurface *surface = q->windowSurface())
            data.window_flags = surface->setWindowFlags(data.window_flags);
    }
    // XXX Reparenting child to toplevel or vice versa ###
    if ((f&Qt::Window) && !(oldFlags&Qt::Window)) {
        //qDebug() << "setParent_sys() change to toplevel";
        q->create(); //### this cannot be right
    } else if ((f&Qt::Window) && !(oldFlags&Qt::Window)) {
        qDebug() << "######## setParent_sys() change from toplevel not implemented ########";
    }

    if (q->isWindow() || (!newparent || newparent->isVisible()) || explicitlyHidden)
        q->setAttribute(Qt::WA_WState_Hidden);
    q->setAttribute(Qt::WA_WState_ExplicitShowHide, explicitlyHidden);

}

QPoint QWidget::mapToGlobal(const QPoint &pos) const
{
    int           x=pos.x(), y=pos.y();
    const QWidget* w = this;
    while (w) {
        x += w->data->crect.x();
        y += w->data->crect.y();
        w = w->isWindow() ? 0 : w->parentWidget();
    }
    return QPoint(x, y);
}

QPoint QWidget::mapFromGlobal(const QPoint &pos) const
{
    int           x=pos.x(), y=pos.y();
    const QWidget* w = this;
    while (w) {
        x -= w->data->crect.x();
        y -= w->data->crect.y();
        w = w->isWindow() ? 0 : w->parentWidget();
    }
    return QPoint(x, y);
}

void QWidgetPrivate::updateSystemBackground() {}

#ifndef QT_NO_CURSOR
void QWidgetPrivate::setCursor_sys(const QCursor &cursor)
{
    Q_UNUSED(cursor);
    Q_Q(QWidget);
    if (q->isVisible())
        updateCursor();
}

void QWidgetPrivate::unsetCursor_sys()
{
    Q_Q(QWidget);
    if (q->isVisible())
        updateCursor();
}

void QWidgetPrivate::updateCursor() const
{
    // XXX
}

#endif //QT_NO_CURSOR

void QWidgetPrivate::setWindowTitle_sys(const QString &caption)
{
    Q_UNUSED(caption);
    // XXX
}

void QWidgetPrivate::setWindowIcon_sys(bool /*forceReset*/)
{
}

void QWidgetPrivate::setWindowIconText_sys(const QString &iconText)
{
    Q_UNUSED(iconText);
}

QWidget *qt_pressGrab = 0;
QWidget *qt_mouseGrb = 0;
static QWidget *keyboardGrb = 0;

void QWidget::grabMouse()
{
    if (qt_mouseGrb)
        qt_mouseGrb->releaseMouse();

    // XXX
    //qwsDisplay()->grabMouse(this,true);

    qt_mouseGrb = this;
    qt_pressGrab = 0;
}

#ifndef QT_NO_CURSOR
void QWidget::grabMouse(const QCursor &cursor)
{
    Q_UNUSED(cursor);

    if (qt_mouseGrb)
        qt_mouseGrb->releaseMouse();

    // XXX
    //qwsDisplay()->grabMouse(this,true);
    //qwsDisplay()->selectCursor(this, cursor.handle());
    qt_mouseGrb = this;
    qt_pressGrab = 0;
}
#endif

void QWidget::releaseMouse()
{
    if (qt_mouseGrb == this) {
        // XXX
        //qwsDisplay()->grabMouse(this,false);
        qt_mouseGrb = 0;
    }
}

void QWidget::grabKeyboard()
{
    if (keyboardGrb)
        keyboardGrb->releaseKeyboard();
    // XXX
    //qwsDisplay()->grabKeyboard(this, true);
    keyboardGrb = this;
}

void QWidget::releaseKeyboard()
{
    if (keyboardGrb == this) {
        // XXX
        //qwsDisplay()->grabKeyboard(this, false);
        keyboardGrb = 0;
    }
}

QWidget *QWidget::mouseGrabber()
{
    if (qt_mouseGrb)
        return qt_mouseGrb;
    return qt_pressGrab;
}

QWidget *QWidget::keyboardGrabber()
{
    return keyboardGrb;
}

void QWidget::activateWindow()
{
    // XXX
//    qDebug() << "QWidget::activateWindow" << this;
    QApplication::setActiveWindow(this); //#####
}

void QWidgetPrivate::show_sys()
{
    Q_Q(QWidget);
    q->setAttribute(Qt::WA_Mapped);
    if (q->testAttribute(Qt::WA_DontShowOnScreen)) {
        invalidateBuffer(q->rect());
        return;
    }

    QApplication::postEvent(q, new QUpdateLaterEvent(q->rect()));

    if (!q->isWindow())
        return;

    if (QWindowSurface *surface = q->windowSurface()) {
         const QRect geomRect = q->geometry();
         if (surface->geometry() != geomRect)
             surface->setGeometry(geomRect);
         surface->setVisible(true);
     }

    if (q->windowType() != Qt::Popup && q->windowType() != Qt::ToolTip && !(q->windowFlags() & Qt::X11BypassWindowManagerHint))
        q->activateWindow(); //###
}


void QWidgetPrivate::hide_sys()
{
    Q_Q(QWidget);
    q->setAttribute(Qt::WA_Mapped, false);
    if (!q->isWindow()) {
        QWidget *p = q->parentWidget();
        if (p &&p->isVisible()) {
            invalidateBuffer(q->rect());
        }
        return;
    }
    if (QWindowSurface *surface = q->windowSurface()) {
         surface->setVisible(false);
     }

    //### we don't yet have proper focus event handling
    if (q == QApplicationPrivate::active_window)
        QApplication::setActiveWindow(0);

}

void QWidgetPrivate::setMaxWindowState_helper()
{
    // XXX
}

void QWidgetPrivate::setFullScreenSize_helper()
{
    // XXX
}

static Qt::WindowStates effectiveState(Qt::WindowStates state)
 {
     if (state & Qt::WindowMinimized)
         return Qt::WindowMinimized;
     else if (state & Qt::WindowFullScreen)
         return Qt::WindowFullScreen;
     else if (state & Qt::WindowMaximized)
         return Qt::WindowMaximized;
     return Qt::WindowNoState;
 }

void QWidget::setWindowState(Qt::WindowStates newstate)
{
    Q_D(QWidget);
    Qt::WindowStates oldstate = windowState();
    if (oldstate == newstate)
        return;
    if (isWindow() && !testAttribute(Qt::WA_WState_Created))
        create();

    data->window_state = newstate;
    data->in_set_window_state = 1;
    bool needShow = false;
    Qt::WindowStates newEffectiveState = effectiveState(newstate);
    Qt::WindowStates oldEffectiveState = effectiveState(oldstate);
    if (isWindow() && newEffectiveState != oldEffectiveState) {
        d->createTLExtra();
        if (oldEffectiveState == Qt::WindowNoState) { //normal
            d->topData()->normalGeometry = geometry();
        } else if (oldEffectiveState == Qt::WindowFullScreen) {
            setParent(0, d->topData()->savedFlags);
            needShow = true;
        } else if (oldEffectiveState == Qt::WindowMinimized) {
            needShow = true;
        }

        if (newEffectiveState == Qt::WindowMinimized) {
            //### not ideal...
            hide();
            needShow = false;
        } else if (newEffectiveState == Qt::WindowFullScreen) {
            d->topData()->savedFlags = windowFlags();
            setParent(0, Qt::FramelessWindowHint | (windowFlags() & Qt::WindowStaysOnTopHint));
            d->setFullScreenSize_helper();
            raise();
            needShow = true;
        } else if (newEffectiveState == Qt::WindowMaximized) {
            createWinId();
            d->setMaxWindowState_helper();
        } else { //normal
            QRect r = d->topData()->normalGeometry;
            if (r.width() >= 0) {
                d->topData()->normalGeometry = QRect(0,0,-1,-1);
                setGeometry(r);
            }
        }
    }
    data->in_set_window_state = 0;

    if (needShow)
        show();

    if (newstate & Qt::WindowActive)
        activateWindow();

    QWindowStateChangeEvent e(oldstate);
    QApplication::sendEvent(this, &e);
}

void QWidgetPrivate::setFocus_sys()
{

}

void QWidgetPrivate::raise_sys()
{
    // XXX
}

void QWidgetPrivate::lower_sys()
{
    // XXX
}

void QWidgetPrivate::stackUnder_sys(QWidget*)
{
    // XXX
}

void QWidgetPrivate::setGeometry_sys(int x, int y, int w, int h, bool isMove)
{
    Q_Q(QWidget);
    if (extra) {                                // any size restrictions?
        w = qMin(w,extra->maxw);
        h = qMin(h,extra->maxh);
        w = qMax(w,extra->minw);
        h = qMax(h,extra->minh);
    }

    QPoint oldp = q->geometry().topLeft();
    QSize olds = q->size();
    QRect r(x, y, w, h);

    bool isResize = olds != r.size();
    isMove = oldp != r.topLeft(); //### why do we have isMove as a parameter?


    // We only care about stuff that changes the geometry, or may
    // cause the window manager to change its state
    if (r.size() == olds && oldp == r.topLeft())
        return;

    if (!data.in_set_window_state) {
        q->data->window_state &= ~Qt::WindowMaximized;
        q->data->window_state &= ~Qt::WindowFullScreen;
        if (q->isWindow())
            topData()->normalGeometry = QRect(0, 0, -1, -1);
    }

    QPoint oldPos = q->pos();
    data.crect = r;

    if (q->isVisible()) {

        if (q->isWindow()) {
            const QWidgetBackingStore *bs = maybeBackingStore();
            if (bs->windowSurface)
                bs->windowSurface->setGeometry(q->frameGeometry());
        } else {
            if (isMove && !isResize)
                moveRect(QRect(oldPos, olds), x - oldPos.x(), y - oldPos.y());
            else
                invalidateBuffer_resizeHelper(oldPos, olds);
        }

        if (isMove) {
            QMoveEvent e(q->pos(), oldPos);
            QApplication::sendEvent(q, &e);
        }
        if (isResize) {
            QResizeEvent e(r.size(), olds);
            QApplication::sendEvent(q, &e);
        }
    } else { // not visible
        if (isMove && q->pos() != oldPos)
            q->setAttribute(Qt::WA_PendingMoveEvent, true);
        if (isResize)
            q->setAttribute(Qt::WA_PendingResizeEvent, true);
    }

}

void QWidgetPrivate::setConstraints_sys()
{
}

void QWidgetPrivate::scroll_sys(int dx, int dy)
{
    Q_Q(QWidget);
    scrollChildren(dx, dy);
    scrollRect(q->rect(), dx, dy);
}

void QWidgetPrivate::scroll_sys(int dx, int dy, const QRect &r)
{
    scrollRect(r, dx, dy);
}

static QGraphicsSystemScreen *qt_screenForWidget(const QWidget *w)
{
    if (!w)
        return 0;
    QRect frame = w->frameGeometry();
    if (!w->isWindow())
        frame.moveTopLeft(w->mapToGlobal(QPoint(0, 0)));
    const QPoint p = (frame.topLeft() + frame.bottomRight()) / 2;

    QGraphicsSystem *gs = QApplicationPrivate::graphicsSystem();
    if (!gs) {
        qWarning("qt_screenForWidget: no graphics system");
        return 0;
    }
    QList<QGraphicsSystemScreen *> screens = gs->screens();

    for (int i = 0; i < screens.size(); ++i) {
        if (screens[i]->geometry().contains(p))
            return screens[i];
    }

    // Assume screen zero if we have it.
    if (!screens.isEmpty())
        return screens[0];
    else
        qWarning("qt_screenForWidget: no screens");

    return 0;
}

int QWidget::metric(PaintDeviceMetric m) const
{
    Q_D(const QWidget);

    QGraphicsSystemScreen *screen = qt_screenForWidget(this);
    if (!screen) {
        if (m == PdmDpiX || m == PdmDpiY)
              return 72;
        return QPaintDevice::metric(m);
    }
    int val;
    if (m == PdmWidth) {
        val = data->crect.width();
    } else if (m == PdmWidthMM) {
        val = data->crect.width() * screen->physicalSize().width() / screen->geometry().width();
    } else if (m == PdmHeight) {
        val = data->crect.height();
    } else if (m == PdmHeightMM) {
        val = data->crect.height() * screen->physicalSize().height() / screen->geometry().height();
    } else if (m == PdmDepth) {
        return screen->depth();
    } else if (m == PdmDpiX || m == PdmPhysicalDpiX) {
        if (d->extra && d->extra->customDpiX)
            return d->extra->customDpiX;
        else if (d->parent)
            return static_cast<QWidget *>(d->parent)->metric(m);
        return qRound(screen->geometry().width() / double(screen->physicalSize().width() / 25.4));
    } else if (m == PdmDpiY || m == PdmPhysicalDpiY) {
        if (d->extra && d->extra->customDpiY)
            return d->extra->customDpiY;
        else if (d->parent)
            return static_cast<QWidget *>(d->parent)->metric(m);
        return qRound(screen->geometry().height() / double(screen->physicalSize().height() / 25.4));
    } else {
        val = QPaintDevice::metric(m);// XXX
    }
    return val;
}

void QWidgetPrivate::createSysExtra()
{
}

void QWidgetPrivate::deleteSysExtra()
{
}

void QWidgetPrivate::createTLSysExtra()
{
}

void QWidgetPrivate::deleteTLSysExtra()
{
}

void QWidgetPrivate::registerDropSite(bool on)
{
    Q_UNUSED(on);
}

void QWidgetPrivate::setMask_sys(const QRegion &region)
{
    Q_UNUSED(region);
    // XXX
}

void QWidgetPrivate::updateFrameStrut()
{
    // XXX
}

void QWidgetPrivate::setWindowOpacity_sys(qreal level)
{
    Q_UNUSED(level);
    // XXX
}

void QWidgetPrivate::setWSGeometry(bool dontShow, const QRect &oldRect)
{
    Q_UNUSED(dontShow);
    Q_UNUSED(oldRect);
    // XXX
}

QPaintEngine *QWidget::paintEngine() const
{
    qWarning("QWidget::paintEngine: Should no longer be called");
    return 0; //##### @@@
}

QWindowSurface *QWidgetPrivate::createDefaultWindowSurface_sys()
{
    Q_Q(QWidget);
    if (q->windowType() == Qt::Desktop)
        return 0;
    q->ensurePolished();

    QGraphicsSystem *gs = QApplicationPrivate::graphicsSystem();
    if (!gs)
        return 0;

    return gs->createWindowSurface(q);
}

void QWidgetPrivate::setModal_sys()
{
}

QT_END_NAMESPACE