/**
 * This file is part of the KDE project.
 *
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 2000 Simon Hausmann <hausmann@kde.org>
 *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
 *           (C) 2003 Apple Computer, Inc.
 *           (C) 2005 Niels Leenheer <niels.leenheer@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */
//#define DEBUG_LAYOUT

#include "rendering/render_frames.h"
#include "rendering/render_canvas.h"
#include "html/html_baseimpl.h"
#include "html/html_objectimpl.h"
#include "html/htmltokenizer.h"
#include "xml/dom2_eventsimpl.h"
#include "xml/dom_docimpl.h"
#include "khtmlview.h"
#include "khtml_part.h"

#include "khtml_debug.h"
#include <QPainter>
#include <QCursor>
#include <QApplication>

using namespace khtml;
using namespace DOM;

RenderFrameSet::RenderFrameSet(HTMLFrameSetElementImpl *frameSet)
    : RenderBox(frameSet)
{
    // init RenderObject attributes
    setInline(false);

    for (int k = 0; k < 2; ++k) {
        m_gridLen[k] = -1;
        m_gridDelta[k] = nullptr;
        m_gridLayout[k] = nullptr;
    }

    m_resizing = m_clientresizing = false;

    m_cursor = Qt::ArrowCursor;

    m_hSplit = -1;
    m_vSplit = -1;

    m_hSplitVar = nullptr;
    m_vSplitVar = nullptr;
}

RenderFrameSet::~RenderFrameSet()
{
    for (int k = 0; k < 2; ++k) {
        delete [] m_gridLayout[k];
        delete [] m_gridDelta[k];
    }
    delete [] m_hSplitVar;
    delete [] m_vSplitVar;
}

bool RenderFrameSet::nodeAtPoint(NodeInfo &info, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction,  bool inBox)
{
    RenderBox::nodeAtPoint(info, _x, _y, _tx, _ty, hitTestAction, inBox);

    bool inside = m_resizing || canResize(_x, _y);

    if (inside && element() && !element()->noResize() && !info.readonly()) {
        info.setInnerNode(element());
        info.setInnerNonSharedNode(element());
    }

    return inside || m_clientresizing;
}

void RenderFrameSet::layout()
{
    KHTMLAssert(needsLayout());
    KHTMLAssert(minMaxKnown());

    if (!parent()->isFrameSet()) {
        KHTMLView *view = canvas()->view();
        m_width = view ? view->visibleWidth() : 0;
        m_height = view ? view->visibleHeight() : 0;
    }

#ifdef DEBUG_LAYOUT
    // qCDebug(KHTML_LOG) << renderName() << "(FrameSet)::layout( ) width=" << width() << ", height=" << height();
#endif

    int remainingLen[2];
    remainingLen[1] = m_width - (element()->totalCols() - 1) * element()->border();
    if (remainingLen[1] < 0) {
        remainingLen[1] = 0;
    }
    remainingLen[0] = m_height - (element()->totalRows() - 1) * element()->border();
    if (remainingLen[0] < 0) {
        remainingLen[0] = 0;
    }

    int availableLen[2];
    availableLen[0] = remainingLen[0];
    availableLen[1] = remainingLen[1];

    if (m_gridLen[0] != element()->totalRows() || m_gridLen[1] != element()->totalCols()) {
        // number of rows or cols changed
        // need to zero out the deltas
        m_gridLen[0] = element()->totalRows();
        m_gridLen[1] = element()->totalCols();
        for (int k = 0; k < 2; ++k) {
            delete [] m_gridDelta[k];
            m_gridDelta[k] = new int[m_gridLen[k]];
            delete [] m_gridLayout[k];
            m_gridLayout[k] = new int[m_gridLen[k]];
            for (int i = 0; i < m_gridLen[k]; ++i) {
                m_gridDelta[k][i] = 0;
            }
        }
    }

    for (int k = 0; k < 2; ++k) {
        int totalRelative = 0;
        int totalFixed = 0;
        int totalPercent = 0;
        int countRelative = 0;
        int countFixed = 0;
        int countPercent = 0;
        int gridLen = m_gridLen[k];
        int *gridDelta = m_gridDelta[k];
        khtml::Length *grid =  k ? element()->m_cols : element()->m_rows;
        int *gridLayout = m_gridLayout[k];

        if (grid) {
            // First we need to investigate how many columns of each type we have and
            // how much space these columns are going to require.
            for (int i = 0; i < gridLen; ++i) {
                // Count the total length of all of the fixed columns/rows -> totalFixed
                // Count the number of columns/rows which are fixed -> countFixed
                if (grid[i].isFixed()) {
                    gridLayout[i] = qMax(grid[i].value(), 0);
                    totalFixed += gridLayout[i];
                    countFixed++;
                }

                // Count the total percentage of all of the percentage columns/rows -> totalPercent
                // Count the number of columns/rows which are percentages -> countPercent
                if (grid[i].isPercent()) {
                    gridLayout[i] = qMax(grid[i].width(availableLen[k]), 0);
                    totalPercent += gridLayout[i];
                    countPercent++;
                }

                // Count the total relative of all the relative columns/rows -> totalRelative
                // Count the number of columns/rows which are relative -> countRelative
                if (grid[i].isRelative()) {
                    totalRelative += qMax(grid[i].value(), 1);
                    countRelative++;
                }
            }

            // Fixed columns/rows are our first priority. If there is not enough space to fit all fixed
            // columns/rows we need to proportionally adjust their size.
            if (totalFixed > remainingLen[k]) {
                int remainingFixed = remainingLen[k];

                for (int i = 0; i < gridLen; ++i) {
                    if (grid[i].isFixed()) {
                        gridLayout[i] = (gridLayout[i] * remainingFixed) / totalFixed;
                        remainingLen[k] -= gridLayout[i];
                    }
                }
            } else {
                remainingLen[k] -= totalFixed;
            }

            // Percentage columns/rows are our second priority. Divide the remaining space proportionally
            // over all percentage columns/rows. IMPORTANT: the size of each column/row is not relative
            // to 100%, but to the total percentage. For example, if there are three columns, each of 75%,
            // and the available space is 300px, each column will become 100px in width.
            if (totalPercent > remainingLen[k]) {
                int remainingPercent = remainingLen[k];

                for (int i = 0; i < gridLen; ++i) {
                    if (grid[i].isPercent()) {
                        gridLayout[i] = (gridLayout[i] * remainingPercent) / totalPercent;
                        remainingLen[k] -= gridLayout[i];
                    }
                }
            } else {
                remainingLen[k] -= totalPercent;
            }

            // Relative columns/rows are our last priority. Divide the remaining space proportionally
            // over all relative columns/rows. IMPORTANT: the relative value of 0* is treated as 1*.
            if (countRelative) {
                int lastRelative = 0;
                int remainingRelative = remainingLen[k];

                for (int i = 0; i < gridLen; ++i) {
                    if (grid[i].isRelative()) {
                        gridLayout[i] = (qMax(grid[i].value(), 1) * remainingRelative) / totalRelative;
                        remainingLen[k] -= gridLayout[i];
                        lastRelative = i;
                    }
                }

                // If we could not evently distribute the available space of all of the relative
                // columns/rows, the remainder will be added to the last column/row.
                // For example: if we have a space of 100px and three columns (*,*,*), the remainder will
                // be 1px and will be added to the last column: 33px, 33px, 34px.
                if (remainingLen[k]) {
                    gridLayout[lastRelative] += remainingLen[k];
                    remainingLen[k] = 0;
                }
            }

            // If we still have some left over space we need to divide it over the already existing
            // columns/rows
            if (remainingLen[k]) {
                // Our first priority is to spread if over the percentage columns. The remaining
                // space is spread evenly, for example: if we have a space of 100px, the columns
                // definition of 25%,25% used to result in two columns of 25px. After this the
                // columns will each be 50px in width.
                if (countPercent && totalPercent) {
                    int remainingPercent = remainingLen[k];
                    int changePercent = 0;

                    for (int i = 0; i < gridLen; ++i) {
                        if (grid[i].isPercent()) {
                            changePercent = (remainingPercent * gridLayout[i]) / totalPercent;
                            gridLayout[i] += changePercent;
                            remainingLen[k] -= changePercent;
                        }
                    }
                } else if (totalFixed) {
                    // Our last priority is to spread the remaining space over the fixed columns.
                    // For example if we have 100px of space and two column of each 40px, both
                    // columns will become exactly 50px.
                    int remainingFixed = remainingLen[k];
                    int changeFixed = 0;

                    for (int i = 0; i < gridLen; ++i) {
                        if (grid[i].isFixed()) {
                            changeFixed = (remainingFixed * gridLayout[i]) / totalFixed;
                            gridLayout[i] += changeFixed;
                            remainingLen[k] -= changeFixed;
                        }
                    }
                }
            }

            // If we still have some left over space we probably ended up with a remainder of
            // a division. We can not spread it evenly anymore. If we have any percentage
            // columns/rows simply spread the remainder equally over all available percentage columns,
            // regardless of their size.
            if (remainingLen[k] && countPercent) {
                int remainingPercent = remainingLen[k];
                int changePercent = 0;

                for (int i = 0; i < gridLen; ++i) {
                    if (grid[i].isPercent()) {
                        changePercent = remainingPercent / countPercent;
                        gridLayout[i] += changePercent;
                        remainingLen[k] -= changePercent;
                    }
                }
            }

            // If we don't have any percentage columns/rows we only have fixed columns. Spread
            // the remainder equally over all fixed columns/rows.
            else if (remainingLen[k] && countFixed) {
                int remainingFixed = remainingLen[k];
                int changeFixed = 0;

                for (int i = 0; i < gridLen; ++i) {
                    if (grid[i].isFixed()) {
                        changeFixed = remainingFixed / countFixed;
                        gridLayout[i] += changeFixed;
                        remainingLen[k] -= changeFixed;
                    }
                }
            }

            // Still some left over... simply add it to the last column, because it is impossible
            // spread it evenly or equally.
            if (remainingLen[k]) {
                gridLayout[gridLen - 1] += remainingLen[k];
            }

            // now we have the final layout, distribute the delta over it
            bool worked = true;
            for (int i = 0; i < gridLen; ++i) {
                if (gridLayout[i] && gridLayout[i] + gridDelta[i] <= 0) {
                    worked = false;
                }
                gridLayout[i] += gridDelta[i];
            }
            // now the delta's broke something, undo it and reset deltas
            if (!worked)
                for (int i = 0; i < gridLen; ++i) {
                    gridLayout[i] -= gridDelta[i];
                    gridDelta[i] = 0;
                }
        } else {
            gridLayout[0] = remainingLen[k];
        }
    }

    positionFrames();

    RenderObject *child = firstChild();
    if (!child) {
        goto end2;
    }

    if (!m_hSplitVar && !m_vSplitVar) {
#ifdef DEBUG_LAYOUT
        // qCDebug(KHTML_LOG) << "calculationg fixed Splitters";
#endif
        if (!m_vSplitVar && element()->totalCols() > 1) {
            m_vSplitVar = new bool[element()->totalCols()];
            for (int i = 0; i < element()->totalCols(); i++) {
                m_vSplitVar[i] = true;
            }
        }
        if (!m_hSplitVar && element()->totalRows() > 1) {
            m_hSplitVar = new bool[element()->totalRows()];
            for (int i = 0; i < element()->totalRows(); i++) {
                m_hSplitVar[i] = true;
            }
        }

        for (int r = 0; r < element()->totalRows(); r++) {
            for (int c = 0; c < element()->totalCols(); c++) {
                bool fixed = false;

                if (child->isFrameSet()) {
                    fixed = static_cast<RenderFrameSet *>(child)->element()->noResize();
                } else {
                    fixed = static_cast<RenderFrame *>(child)->element()->noResize();
                }

                if (fixed) {
#ifdef DEBUG_LAYOUT
                    // qCDebug(KHTML_LOG) << "found fixed cell " << r << "/" << c << "!";
#endif
                    if (element()->totalCols() > 1) {
                        if (c > 0) {
                            m_vSplitVar[c - 1] = false;
                        }
                        m_vSplitVar[c] = false;
                    }
                    if (element()->totalRows() > 1) {
                        if (r > 0) {
                            m_hSplitVar[r - 1] = false;
                        }
                        m_hSplitVar[r] = false;
                    }
                    child = child->nextSibling();
                    if (!child) {
                        goto end2;
                    }
                }
#ifdef DEBUG_LAYOUT
                else
                    // qCDebug(KHTML_LOG) << "not fixed: " << r << "/" << c << "!";
#endif
                }
        }

    }
    RenderContainer::layout();
end2:
    setNeedsLayout(false);
}

void RenderFrameSet::positionFrames()
{
    int r;
    int c;

    RenderObject *child = firstChild();
    if (!child) {
        return;
    }

    //  NodeImpl *child = _first;
    //  if(!child) return;

    int yPos = 0;

    for (r = 0; r < element()->totalRows(); r++) {
        int xPos = 0;
        for (c = 0; c < element()->totalCols(); c++) {
            child->setPos(xPos, yPos);
#ifdef DEBUG_LAYOUT
            // qCDebug(KHTML_LOG) << "child frame at (" << xPos << "/" << yPos << ") size (" << m_gridLayout[1][c] << "/" << m_gridLayout[0][r] << ")";
#endif
            // has to be resized and itself resize its contents
            if ((m_gridLayout[1][c] != child->width()) || (m_gridLayout[0][r] != child->height())) {
                child->setWidth(m_gridLayout[1][c]);
                child->setHeight(m_gridLayout[0][r]);
                child->setNeedsLayout(true);
                child->layout();
            }

            xPos += m_gridLayout[1][c] + element()->border();
            child = child->nextSibling();

            if (!child) {
                return;
            }

        }

        yPos += m_gridLayout[0][r] + element()->border();
    }

    // all the remaining frames are hidden to avoid ugly
    // spurious unflowed frames
    while (child) {
        child->setWidth(0);
        child->setHeight(0);
        child->setNeedsLayout(false);

        child = child->nextSibling();
    }
}

bool RenderFrameSet::userResize(MouseEventImpl *evt)
{
    if (needsLayout()) {
        return false;
    }

    bool res = false;
    int _x = evt->clientX();
    int _y = evt->clientY();

    if ((!m_resizing && evt->id() == EventImpl::MOUSEMOVE_EVENT) || evt->id() == EventImpl::MOUSEDOWN_EVENT) {
#ifdef DEBUG_LAYOUT
        // qCDebug(KHTML_LOG) << "mouseEvent:check";
#endif

        m_hSplit = -1;
        m_vSplit = -1;

        // check if we're over a horizontal or vertical boundary
        int pos = m_gridLayout[1][0] + xPos();
        for (int c = 1; c < element()->totalCols(); c++) {
            if (_x >= pos && _x <= pos + element()->border()) {
                if (m_vSplitVar && m_vSplitVar[c - 1] == true) {
                    m_vSplit = c - 1;
                }
#ifdef DEBUG_LAYOUT
                // qCDebug(KHTML_LOG) << "vsplit!";
#endif
                res = true;
                break;
            }
            pos += m_gridLayout[1][c] + element()->border();
        }

        pos = m_gridLayout[0][0] + yPos();
        for (int r = 1; r < element()->totalRows(); r++) {
            if (_y >= pos && _y <= pos + element()->border()) {
                if (m_hSplitVar && m_hSplitVar[r - 1] == true) {
                    m_hSplit = r - 1;
                }
#ifdef DEBUG_LAYOUT
                // qCDebug(KHTML_LOG) << "hsplitvar = " << m_hSplitVar;
                // qCDebug(KHTML_LOG) << "hsplit!";
#endif
                res = true;
                break;
            }
            pos += m_gridLayout[0][r] + element()->border();
        }
#ifdef DEBUG_LAYOUT
        // qCDebug(KHTML_LOG) << m_hSplit << "/" << m_vSplit;
#endif
    }

    m_cursor = Qt::ArrowCursor;
    if (m_hSplit != -1 && m_vSplit != -1) {
        m_cursor = Qt::SizeAllCursor;
    } else if (m_vSplit != -1) {
        m_cursor = Qt::SizeHorCursor;
    } else if (m_hSplit != -1) {
        m_cursor = Qt::SizeVerCursor;
    }

    if (!m_resizing && evt->id() == EventImpl::MOUSEDOWN_EVENT) {
        setResizing(true);
        QApplication::setOverrideCursor(QCursor(m_cursor));
        m_vSplitPos = _x;
        m_hSplitPos = _y;
        m_oldpos = -1;
    }

    // ### check the resize is not going out of bounds.
    if (m_resizing) {
        if (evt->id() == EventImpl::MOUSEUP_EVENT) {
            setResizing(false);
            QApplication::restoreOverrideCursor();
        }

        if (m_vSplit != -1) {
#ifdef DEBUG_LAYOUT
            // qCDebug(KHTML_LOG) << "split xpos=" << _x;
#endif
            int delta = m_vSplitPos - _x;
            m_gridDelta[1][m_vSplit] -= delta;
            m_gridDelta[1][m_vSplit + 1] += delta;
            m_vSplitPos = _x;
        }
        if (m_hSplit != -1) {
#ifdef DEBUG_LAYOUT
            // qCDebug(KHTML_LOG) << "split ypos=" << _y;
#endif
            int delta = m_hSplitPos - _y;
            m_gridDelta[0][m_hSplit] -= delta;
            m_gridDelta[0][m_hSplit + 1] += delta;
            m_hSplitPos = _y;
        }

        // this just schedules the relayout
        // important, otherwise the moving indicator is not correctly erased
        setNeedsLayout(true);
    }

    /*
      KHTMLView *view = canvas()->view();
      if ((m_resizing || evt->id() == EventImpl::MOUSEUP_EVENT) && view) {
          QPainter paint( view );
          paint.setPen( Qt::gray );
          paint.setBrush( Qt::gray );
          paint.setCompositionMode(QPainter::CompositionMode_Xor);
          QRect r(xPos(), yPos(), width(), height());
          const int rBord = 3;
          int sw = element()->border();
          int p = m_resizing ? (m_vSplit > -1 ? _x : _y) : -1;
          if (m_vSplit > -1) {
              if ( m_oldpos >= 0 )
                  paint.drawRect( m_oldpos + sw/2 - rBord , r.y(),
                                  2*rBord, r.height() );
              if ( p >= 0 )
                  paint.drawRect( p  + sw/2 - rBord, r.y(), 2*rBord, r.height() );
          } else {
              if ( m_oldpos >= 0 )
                  paint.drawRect( r.x(), m_oldpos + sw/2 - rBord,
                                  r.width(), 2*rBord );
              if ( p >= 0 )
                  paint.drawRect( r.x(), p + sw/2 - rBord, r.width(), 2*rBord );
          }
          m_oldpos = p;
      }
    */
    return res;
}

void RenderFrameSet::paintFrameSetRules(QPainter *paint, const QRect &damageRect)
{
    Q_UNUSED(damageRect);
    KHTMLView *view = canvas()->view();
    if (view && !noResize()) {
        paint->setPen(Qt::gray);
        paint->setBrush(Qt::gray);
        const int rBord = 3;
        int sw = element()->border();

        // ### implement me

        (void) rBord;
        (void) sw;
    }

}

void RenderFrameSet::setResizing(bool e)
{
    m_resizing = e;
    for (RenderObject *p = parent(); p; p = p->parent())
        if (p->isFrameSet()) {
            static_cast<RenderFrameSet *>(p)->m_clientresizing = m_resizing;
        }
}

bool RenderFrameSet::canResize(int _x, int _y)
{
    // if we haven't received a layout, then the gridLayout doesn't contain useful data yet
    if (needsLayout() || !m_gridLayout[0] || !m_gridLayout[1]) {
        return false;
    }

    // check if we're over a horizontal or vertical boundary
    int pos = m_gridLayout[1][0];
    for (int c = 1; c < element()->totalCols(); c++)
        if (_x >= pos && _x <= pos + element()->border()) {
            return true;
        }

    pos = m_gridLayout[0][0];
    for (int r = 1; r < element()->totalRows(); r++)
        if (_y >= pos && _y <= pos + element()->border()) {
            return true;
        }

    return false;
}

#ifdef ENABLE_DUMP
void RenderFrameSet::dump(QTextStream &stream, const QString &ind) const
{
    RenderBox::dump(stream, ind);
    stream << " totalrows=" << element()->totalRows();
    stream << " totalcols=" << element()->totalCols();

    if (m_hSplitVar)
        for (uint i = 0; i < (uint)element()->totalRows(); i++) {
            stream << " hSplitvar(" << i << ")=" << m_hSplitVar[i];
        }

    if (m_vSplitVar)
        for (uint i = 0; i < (uint)element()->totalCols(); i++) {
            stream << " vSplitvar(" << i << ")=" << m_vSplitVar[i];
        }
}
#endif

/**************************************************************************************/

RenderPart::RenderPart(DOM::HTMLElementImpl *node)
    : RenderWidget(node)
{
    // init RenderObject attributes
    setInline(false);

    // HTMLPartContainerElementImpl does memory management, not us
    setDoesNotOwnWidget();
}

void RenderPart::setWidget(QWidget *widget)
{
#ifdef DEBUG_LAYOUT
    // qCDebug(KHTML_LOG) << "RenderPart::setWidget()";
#endif

    setQWidget(widget);
    if (widget) {
        widget->setFocusPolicy(Qt::WheelFocus);
        if (widget->inherits("KHTMLView")) {
            connect(widget, SIGNAL(cleared()), this, SLOT(slotViewCleared()));
        }
    }

    setNeedsLayoutAndMinMaxRecalc();

    // make sure the scrollbars are set correctly for restore
    // ### find better fix
    slotViewCleared();
}

short RenderPart::intrinsicWidth() const
{
    return 300;
}

int RenderPart::intrinsicHeight() const
{
    return 150;
}

void RenderPart::slotViewCleared()
{
}

/***************************************************************************************/

RenderFrame::RenderFrame(DOM::HTMLFrameElementImpl *frame)
    : RenderPart(frame)
{
    setInline(false);
}

void RenderFrame::slotViewCleared()
{
    if (QScrollArea *view = qobject_cast<QScrollArea *>(m_widget)) {
#ifdef DEBUG_LAYOUT
        // qCDebug(KHTML_LOG) << "frame is a scrollarea!";
#endif
        if (!element()->frameBorder || !((static_cast<HTMLFrameSetElementImpl *>(element()->parentNode()))->frameBorder())) {
            view->setFrameStyle(QFrame::NoFrame);
        }
        if (KHTMLView *htmlView = qobject_cast<KHTMLView *>(view)) {
#ifdef DEBUG_LAYOUT
            // qCDebug(KHTML_LOG) << "frame is a KHTMLview!";
#endif
            htmlView->setVerticalScrollBarPolicy(element()->scrolling);
            htmlView->setHorizontalScrollBarPolicy(element()->scrolling);
            if (element()->marginWidth != -1) {
                htmlView->setMarginWidth(element()->marginWidth);
            }
            if (element()->marginHeight != -1) {
                htmlView->setMarginHeight(element()->marginHeight);
            }
        } else {
            // those are no more virtual in Qt4 ;(
            view->setVerticalScrollBarPolicy(element()->scrolling);
            view->setHorizontalScrollBarPolicy(element()->scrolling);
        }
    }

}

/****************************************************************************************/

RenderPartObject::RenderPartObject(DOM::HTMLElementImpl *element)
    : RenderPart(element)
{
    // init RenderObject attributes
    setInline(true);
}

void RenderPartObject::layout()
{
    KHTMLAssert(needsLayout());
    KHTMLAssert(minMaxKnown());

    calcWidth();
    calcHeight();

    RenderPart::layout();

    setNeedsLayout(false);
}

void RenderPartObject::slotViewCleared()
{
    if (QScrollArea *view = qobject_cast<QScrollArea *>(m_widget)) {
#ifdef DEBUG_LAYOUT
        // qCDebug(KHTML_LOG) << "iframe is a scrollview!";
#endif
        int frameStyle = QFrame::NoFrame;
        Qt::ScrollBarPolicy scroll = Qt::ScrollBarAsNeeded;
        int marginw = -1;
        int marginh = -1;
        if (element()->id() == ID_IFRAME) {
            HTMLIFrameElementImpl *frame = static_cast<HTMLIFrameElementImpl *>(element());
            if (frame->frameBorder) {
                frameStyle = QFrame::Box;
            }
            scroll = frame->scrolling;
            marginw = frame->marginWidth;
            marginh = frame->marginHeight;
        }
        view->setFrameStyle(frameStyle);
        if (KHTMLView *htmlView = qobject_cast<KHTMLView *>(view)) {
#ifdef DEBUG_LAYOUT
            // qCDebug(KHTML_LOG) << "frame is a KHTMLview!";
#endif
            htmlView->setIgnoreWheelEvents(element()->id() == ID_IFRAME);
            htmlView->setVerticalScrollBarPolicy(scroll);
            htmlView->setHorizontalScrollBarPolicy(scroll);
            if (marginw != -1) {
                htmlView->setMarginWidth(marginw);
            }
            if (marginh != -1) {
                htmlView->setMarginHeight(marginh);
            }
        } else {
            // those are no more virtual in Qt4 ;(
            view->setVerticalScrollBarPolicy(scroll);
            view->setHorizontalScrollBarPolicy(scroll);
        }

    }
}