htmlcell.cpp

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wxString wxHtmlWordCell::ConvertToText(wxHtmlSelection *s) const
{
    if ( s && (this == s->GetFromCell() || this == s->GetToCell()) )
    {
        wxPoint priv = this == s->GetFromCell() ? s->GetFromPrivPos()
                                                : s->GetToPrivPos();

        // VZ: we may be called before we had a chance to re-render ourselves
        //     and in this case GetFrom/ToPrivPos() is not set yet -- assume
        //     that this only happens in case of a double/triple click (which
        //     seems to be the case now) and so it makes sense to select the
        //     entire contents of the cell in this case
        //
        // TODO: but this really needs to be fixed in some better way later...
        if ( priv != wxDefaultPosition )
        {
            int part1 = priv.x;
            int part2 = priv.y;
            return m_Word.Mid(part1, part2-part1);
        }
        //else: return the whole word below
    }

    return m_Word;
}

wxCursor wxHtmlWordCell::GetCursor() const
{
    if ( !GetLink() )
    {
        if ( !gs_cursorText )
            gs_cursorText = new wxCursor(wxCURSOR_IBEAM);
        return *gs_cursorText;
    }
    else
        return wxHtmlCell::GetCursor();
}


//-----------------------------------------------------------------------------
// wxHtmlContainerCell
//-----------------------------------------------------------------------------

IMPLEMENT_ABSTRACT_CLASS(wxHtmlContainerCell, wxHtmlCell)

wxHtmlContainerCell::wxHtmlContainerCell(wxHtmlContainerCell *parent) : wxHtmlCell()
{
    m_Cells = m_LastCell = NULL;
    m_Parent = parent;
    m_MaxTotalWidth = 0;
    if (m_Parent) m_Parent->InsertCell(this);
    m_AlignHor = wxHTML_ALIGN_LEFT;
    m_AlignVer = wxHTML_ALIGN_BOTTOM;
    m_IndentLeft = m_IndentRight = m_IndentTop = m_IndentBottom = 0;
    m_WidthFloat = 100; m_WidthFloatUnits = wxHTML_UNITS_PERCENT;
    m_UseBkColour = false;
    m_UseBorder = false;
    m_MinHeight = 0;
    m_MinHeightAlign = wxHTML_ALIGN_TOP;
    m_LastLayout = -1;
}

wxHtmlContainerCell::~wxHtmlContainerCell()
{
    wxHtmlCell *cell = m_Cells;
    while ( cell )
    {
        wxHtmlCell *cellNext = cell->GetNext();
        delete cell;
        cell = cellNext;
    }
}



void wxHtmlContainerCell::SetIndent(int i, int what, int units)
{
    int val = (units == wxHTML_UNITS_PIXELS) ? i : -i;
    if (what & wxHTML_INDENT_LEFT) m_IndentLeft = val;
    if (what & wxHTML_INDENT_RIGHT) m_IndentRight = val;
    if (what & wxHTML_INDENT_TOP) m_IndentTop = val;
    if (what & wxHTML_INDENT_BOTTOM) m_IndentBottom = val;
    m_LastLayout = -1;
}



int wxHtmlContainerCell::GetIndent(int ind) const
{
    if (ind & wxHTML_INDENT_LEFT) return m_IndentLeft;
    else if (ind & wxHTML_INDENT_RIGHT) return m_IndentRight;
    else if (ind & wxHTML_INDENT_TOP) return m_IndentTop;
    else if (ind & wxHTML_INDENT_BOTTOM) return m_IndentBottom;
    else return -1; /* BUG! Should not be called... */
}




int wxHtmlContainerCell::GetIndentUnits(int ind) const
{
    bool p = false;
    if (ind & wxHTML_INDENT_LEFT) p = m_IndentLeft < 0;
    else if (ind & wxHTML_INDENT_RIGHT) p = m_IndentRight < 0;
    else if (ind & wxHTML_INDENT_TOP) p = m_IndentTop < 0;
    else if (ind & wxHTML_INDENT_BOTTOM) p = m_IndentBottom < 0;
    if (p) return wxHTML_UNITS_PERCENT;
    else return wxHTML_UNITS_PIXELS;
}



bool wxHtmlContainerCell::AdjustPagebreak(int *pagebreak, int* known_pagebreaks, int number_of_pages) const
{
    if (!m_CanLiveOnPagebreak)
        return wxHtmlCell::AdjustPagebreak(pagebreak, known_pagebreaks, number_of_pages);

    else
    {
        wxHtmlCell *c = GetFirstChild();
        bool rt = false;
        int pbrk = *pagebreak - m_PosY;

        while (c)
        {
            if (c->AdjustPagebreak(&pbrk, known_pagebreaks, number_of_pages))
                rt = true;
            c = c->GetNext();
        }
        if (rt)
            *pagebreak = pbrk + m_PosY;
        return rt;
    }
}



void wxHtmlContainerCell::Layout(int w)
{
    wxHtmlCell::Layout(w);

    if (m_LastLayout == w) return;

    // VS: Any attempt to layout with negative or zero width leads to hell,
    // but we can't ignore such attempts completely, since it sometimes
    // happen (e.g. when trying how small a table can be). The best thing we
    // can do is to set the width of child cells to zero
    if (w < 1)
    {
       m_Width = 0;
       for (wxHtmlCell *cell = m_Cells; cell; cell = cell->GetNext())
            cell->Layout(0);
            // this does two things: it recursively calls this code on all
            // child contrainers and resets children's position to (0,0)
       return;
    }

    wxHtmlCell *cell = m_Cells,
               *line = m_Cells;
    wxHtmlCell *nextCell;
    long xpos = 0, ypos = m_IndentTop;
    int xdelta = 0, ybasicpos = 0, ydiff;
    int s_width, nextWordWidth, s_indent;
    int ysizeup = 0, ysizedown = 0;
    int MaxLineWidth = 0;
    int curLineWidth = 0;
    m_MaxTotalWidth = 0;


    /*

    WIDTH ADJUSTING :

    */

    if (m_WidthFloatUnits == wxHTML_UNITS_PERCENT)
    {
        if (m_WidthFloat < 0) m_Width = (100 + m_WidthFloat) * w / 100;
        else m_Width = m_WidthFloat * w / 100;
    }
    else
    {
        if (m_WidthFloat < 0) m_Width = w + m_WidthFloat;
        else m_Width = m_WidthFloat;
    }

    if (m_Cells)
    {
        int l = (m_IndentLeft < 0) ? (-m_IndentLeft * m_Width / 100) : m_IndentLeft;
        int r = (m_IndentRight < 0) ? (-m_IndentRight * m_Width / 100) : m_IndentRight;
        for (wxHtmlCell *cell = m_Cells; cell; cell = cell->GetNext())
            cell->Layout(m_Width - (l + r));
    }

    /*

    LAYOUTING :

    */

    // adjust indentation:
    s_indent = (m_IndentLeft < 0) ? (-m_IndentLeft * m_Width / 100) : m_IndentLeft;
    s_width = m_Width - s_indent - ((m_IndentRight < 0) ? (-m_IndentRight * m_Width / 100) : m_IndentRight);

    // my own layouting:
    while (cell != NULL)
    {
        switch (m_AlignVer)
        {
            case wxHTML_ALIGN_TOP :      ybasicpos = 0; break;
            case wxHTML_ALIGN_BOTTOM :   ybasicpos = - cell->GetHeight(); break;
            case wxHTML_ALIGN_CENTER :   ybasicpos = - cell->GetHeight() / 2; break;
        }
        ydiff = cell->GetHeight() + ybasicpos;

        if (cell->GetDescent() + ydiff > ysizedown) ysizedown = cell->GetDescent() + ydiff;
        if (ybasicpos + cell->GetDescent() < -ysizeup) ysizeup = - (ybasicpos + cell->GetDescent());

        // layout nonbreakable run of cells:
        cell->SetPos(xpos, ybasicpos + cell->GetDescent());
        xpos += cell->GetWidth();
        if (!cell->IsTerminalCell())
        {
            // Container cell indicates new line
            if (curLineWidth > m_MaxTotalWidth)
                m_MaxTotalWidth = curLineWidth;

            if (wxMax(cell->GetWidth(), cell->GetMaxTotalWidth()) > m_MaxTotalWidth)
                m_MaxTotalWidth = cell->GetMaxTotalWidth();
            curLineWidth = 0;
        }
        else
            // Normal cell, add maximum cell width to line width
            curLineWidth += cell->GetMaxTotalWidth();

        cell = cell->GetNext();

        // compute length of the next word that would be added:
        nextWordWidth = 0;
        if (cell)
        {
            nextCell = cell;
            do
            {
                nextWordWidth += nextCell->GetWidth();
                nextCell = nextCell->GetNext();
            } while (nextCell && !nextCell->IsLinebreakAllowed());
        }

        // force new line if occurred:
        if ((cell == NULL) ||
            (xpos + nextWordWidth > s_width && cell->IsLinebreakAllowed()))
        {
            if (xpos > MaxLineWidth) MaxLineWidth = xpos;
            if (ysizeup < 0) ysizeup = 0;
            if (ysizedown < 0) ysizedown = 0;
            switch (m_AlignHor) {
                case wxHTML_ALIGN_LEFT :
                case wxHTML_ALIGN_JUSTIFY :
                         xdelta = 0;
                         break;
                case wxHTML_ALIGN_RIGHT :
                         xdelta = 0 + (s_width - xpos);
                         break;
                case wxHTML_ALIGN_CENTER :
                         xdelta = 0 + (s_width - xpos) / 2;
                         break;
            }
            if (xdelta < 0) xdelta = 0;
            xdelta += s_indent;

            ypos += ysizeup;

            if (m_AlignHor != wxHTML_ALIGN_JUSTIFY || cell == NULL)
            {
                while (line != cell)
                {
                    line->SetPos(line->GetPosX() + xdelta,
                                   ypos + line->GetPosY());
                    line = line->GetNext();
                }
            }
            else // align == justify
            {
                // we have to distribute the extra horz space between the cells
                // on this line

                // an added complication is that some cells have fixed size and
                // shouldn't get any increment (it so happens that these cells
                // also don't allow line break on them which provides with an
                // easy way to test for this) -- and neither should the cells
                // adjacent to them as this could result in a visible space
                // between two cells separated by, e.g. font change, cell which
                // is wrong

                int step = s_width - xpos;
                if ( step > 0 )
                {
                    // first count the cells which will get extra space
                    int total = 0;

                    const wxHtmlCell *c;
                    if ( line != cell )
                    {
                        for ( c = line->GetNext(); c != cell; c = c->GetNext() )
                        {
                            if ( c->IsLinebreakAllowed() )
                            {
                                total++;
                            }
                        }
                    }

                    // and now extra space to those cells which merit it
                    if ( total )
                    {
                        // first cell on line is not moved:
                        line->SetPos(line->GetPosX() + s_indent,
                                     line->GetPosY() + ypos);

                        line = line->GetNext();
                        for ( int n = 0; line != cell; line = line->GetNext() )
                        {
                            if ( line->IsLinebreakAllowed() )
                            {
                                // offset the next cell relative to this one
                                // thus increasing our size
                                n++;
                            }

                            line->SetPos(line->GetPosX() + s_indent +
                                           ((n * step) / total),
                                           line->GetPosY() + ypos);
                        }
                    }
                    else
                    {
                        // this will cause the code to enter "else branch" below:
                        step = 0;
                    }
                }
                // else branch:
                if ( step <= 0 ) // no extra space to distribute
                {
                    // just set the indent properly
                    while (line != cell)
                    {
                        line->SetPos(line->GetPosX() + s_indent,
                                     line->GetPosY() + ypos);
                        line = line->GetNext();
                    }
                }
            }

            ypos += ysizedown;
            xpos = 0;
            ysizeup = ysizedown = 0;
            line = cell;
        }
    }

    // setup height & width, depending on container layout:
    m_Height = ypos + (ysizedown + ysizeup) + m_IndentBottom;

    if (m_Height < m_MinHeight)
    {
        if (m_MinHeightAlign != wxHTML_ALIGN_TOP)
        {
            int diff = m_MinHeight - m_Height;
            if (m_MinHeightAlign == wxHTML_ALIGN_CENTER) diff /= 2;
            cell = m_Cells;
            while (cell)
            {
                cell->SetPos(cell->GetPosX(), cell->GetPosY() + diff);
                cell = cell->GetNext();
            }
        }
        m_Height = m_MinHeight;
    }

    if (curLineWidth > m_MaxTotalWidth)
        m_MaxTotalWidth = curLineWidth;

    m_MaxTotalWidth += s_indent + ((m_IndentRight < 0) ? (-m_IndentRight * m_Width / 100) : m_IndentRight);
    MaxLineWidth += s_indent + ((m_IndentRight < 0) ? (-m_IndentRight * m_Width / 100) : m_IndentRight);
    if (m_Width < MaxLineWidth) m_Width = MaxLineWidth;

    m_LastLayout = w;
}

void wxHtmlContainerCell::UpdateRenderingStatePre(wxHtmlRenderingInfo& info,
                                                  wxHtmlCell *cell) const
{
    wxHtmlSelection *s = info.GetSelection();
    if (!s) return;
    if (s->GetFromCell() == cell || s->GetToCell() == cell)
    {
        info.GetState().SetSelectionState(wxHTML_SEL_CHANGING);
    }
}

void wxHtmlContainerCell::UpdateRenderingStatePost(wxHtmlRenderingInfo& info,
                                                   wxHtmlCell *cell) const
{
    wxHtmlSelection *s = info.GetSelection();
    if (!s) return;
    if (s->GetToCell() == cell)
        info.GetState().SetSelectionState(wxHTML_SEL_OUT);
    else if (s->GetFromCell() == cell)
        info.GetState().SetSelectionState(wxHTML_SEL_IN);
}

#define mMin(a, b) (((a) < (b)) ? (a) : (b))
#define mMax(a, b) (((a) < (b)) ? (b) : (a))

void wxHtmlContainerCell::Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
                               wxHtmlRenderingInfo& info)
{
#if 0 // useful for debugging
    dc.SetPen(*wxRED_PEN);
    dc.DrawRectangle(x+m_PosX,y+m_PosY,m_Width,m_Height);
#endif

    int xlocal = x + m_PosX;
    int ylocal = y + m_PosY;

    if (m_UseBkColour)
    {
        wxBrush myb = wxBrush(m_BkColour, wxSOLID);

        int real_y1 = mMax(ylocal, view_y1);
        int real_y2 = mMin(ylocal + m_Height - 1, view_y2);

        dc.SetBrush(myb);
        dc.SetPen(*wxTRANSPARENT_PEN);
        dc.DrawRectangle(xlocal, real_y1, m_Width, real_y2 - real_y1 + 1);
    }

    if (m_UseBorder)
    {
        wxPen mypen1(m_BorderColour1, 1, wxSOLID);
        wxPen mypen2(m_BorderColour2, 1, wxSOLID);

        dc.SetPen(mypen1);
        dc.DrawLine(xlocal, ylocal, xlocal, ylocal + m_Height - 1);
        dc.DrawLine(xlocal, ylocal, xlocal + m_Width, ylocal);
        dc.SetPen(mypen2);
        dc.DrawLine(xlocal + m_Width - 1, ylocal, xlocal +  m_Width - 1, ylocal + m_Height - 1);
        dc.DrawLine(xlocal, ylocal + m_Height - 1, xlocal + m_Width, ylocal + m_Height - 1);
    }

    if (m_Cells)
    {
        // draw container's contents:
        for (wxHtmlCell *cell = m_Cells; cell; cell = cell->GetNext())
        {

            // optimize drawing: don't render off-screen content:
            if ((ylocal + cell->GetPosY() <= view_y2) &&
                (ylocal + cell->GetPosY() + cell->GetHeight() > view_y1))
            {
                // the cell is visible, draw it:
                UpdateRenderingStatePre(info, cell);
                cell->Draw(dc,
                           xlocal, ylocal, view_y1, view_y2,
                           info);
                UpdateRenderingStatePost(info, cell);
            }
            else
            {
                // the cell is off-screen, proceed with font+color+etc.
                // changes only:
                cell->DrawInvisible(dc, xlocal, ylocal, info);
            }
        }
    }
}



void wxHtmlContainerCell::DrawInvisible(wxDC& dc, int x, int y,
                                        wxHtmlRenderingInfo& info)
{
    if (m_Cells)
    {
        for (wxHtmlCell *cell = m_Cells; cell; cell = cell->GetNext())
        {
            UpdateRenderingStatePre(info, cell);
            cell->DrawInvisible(dc, x + m_PosX, y + m_PosY, info);
            UpdateRenderingStatePost(info, cell);
        }