htmlcell.cpp

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/////////////////////////////////////////////////////////////////////////////
// Name:        htmlcell.cpp
// Purpose:     wxHtmlCell - basic element of HTML output
// Author:      Vaclav Slavik
// RCS-ID:      $Id: htmlcell.cpp,v 1.102 2005/09/11 12:09:35 VZ Exp $
// Copyright:   (c) 1999 Vaclav Slavik
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "htmlcell.h"
#endif

#include "wx/wxprec.h"

#include "wx/defs.h"

#if wxUSE_HTML && wxUSE_STREAMS

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WXPRECOMP
    #include "wx/brush.h"
    #include "wx/colour.h"
    #include "wx/dc.h"
#endif

#include "wx/html/htmlcell.h"
#include "wx/html/htmlwin.h"
#include "wx/settings.h"
#include "wx/module.h"
#include "wx/dynarray.h"

#include <stdlib.h>

//-----------------------------------------------------------------------------
// Global variables
//-----------------------------------------------------------------------------

static wxCursor *gs_cursorLink = NULL;
static wxCursor *gs_cursorText = NULL;


//-----------------------------------------------------------------------------
// Helper classes
//-----------------------------------------------------------------------------

void wxHtmlSelection::Set(const wxPoint& fromPos, const wxHtmlCell *fromCell,
                          const wxPoint& toPos, const wxHtmlCell *toCell)
{
    m_fromCell = fromCell;
    m_toCell = toCell;
    m_fromPos = fromPos;
    m_toPos = toPos;
}

void wxHtmlSelection::Set(const wxHtmlCell *fromCell, const wxHtmlCell *toCell)
{
    wxPoint p1 = fromCell ? fromCell->GetAbsPos() : wxDefaultPosition;
    wxPoint p2 = toCell ? toCell->GetAbsPos() : wxDefaultPosition;
    if ( toCell )
    {
        p2.x += toCell->GetWidth();
        p2.y += toCell->GetHeight();
    }
    Set(p1, fromCell, p2, toCell);
}

wxColour
wxDefaultHtmlRenderingStyle::
GetSelectedTextColour(const wxColour& WXUNUSED(clr))
{
    return wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHTTEXT);
}

wxColour
wxDefaultHtmlRenderingStyle::
GetSelectedTextBgColour(const wxColour& WXUNUSED(clr))
{
    return wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHT);
}


//-----------------------------------------------------------------------------
// wxHtmlCell
//-----------------------------------------------------------------------------

IMPLEMENT_ABSTRACT_CLASS(wxHtmlCell, wxObject)

wxHtmlCell::wxHtmlCell() : wxObject()
{
    m_Next = NULL;
    m_Parent = NULL;
    m_Width = m_Height = m_Descent = 0;
    m_CanLiveOnPagebreak = true;
    m_Link = NULL;
}

wxHtmlCell::~wxHtmlCell()
{
    delete m_Link;
}


void wxHtmlCell::OnMouseClick(wxWindow *parent, int x, int y,
                              const wxMouseEvent& event)
{
    wxHtmlLinkInfo *lnk = GetLink(x, y);
    if (lnk != NULL)
    {
        wxHtmlLinkInfo lnk2(*lnk);
        lnk2.SetEvent(&event);
        lnk2.SetHtmlCell(this);

        // note : this cast is legal because parent is *always* wxHtmlWindow
        wxStaticCast(parent, wxHtmlWindow)->OnLinkClicked(lnk2);
    }
}


wxCursor wxHtmlCell::GetCursor() const
{
    if ( GetLink() )
    {
        if ( !gs_cursorLink )
            gs_cursorLink = new wxCursor(wxCURSOR_HAND);
        return *gs_cursorLink;
    }
    else
        return *wxSTANDARD_CURSOR;
}


bool wxHtmlCell::AdjustPagebreak(int *pagebreak, int* WXUNUSED(known_pagebreaks), int WXUNUSED(number_of_pages)) const
{
    if ((!m_CanLiveOnPagebreak) &&
                m_PosY < *pagebreak && m_PosY + m_Height > *pagebreak)
    {
        *pagebreak = m_PosY;
        return true;
    }

    return false;
}



void wxHtmlCell::SetLink(const wxHtmlLinkInfo& link)
{
    if (m_Link) delete m_Link;
    m_Link = NULL;
    if (link.GetHref() != wxEmptyString)
        m_Link = new wxHtmlLinkInfo(link);
}


void wxHtmlCell::Layout(int WXUNUSED(w))
{
    SetPos(0, 0);
}



const wxHtmlCell* wxHtmlCell::Find(int WXUNUSED(condition), const void* WXUNUSED(param)) const
{
    return NULL;
}


wxHtmlCell *wxHtmlCell::FindCellByPos(wxCoord x, wxCoord y,
                                      unsigned flags) const
{
    if ( x >= 0 && x < m_Width && y >= 0 && y < m_Height )
    {
        return wxConstCast(this, wxHtmlCell);
    }
    else
    {
        if ((flags & wxHTML_FIND_NEAREST_AFTER) &&
                (y < 0 || (y < 0+m_Height && x < 0+m_Width)))
            return wxConstCast(this, wxHtmlCell);
        else if ((flags & wxHTML_FIND_NEAREST_BEFORE) &&
                (y >= 0+m_Height || (y >= 0 && x >= 0)))
            return wxConstCast(this, wxHtmlCell);
        else
            return NULL;
    }
}


wxPoint wxHtmlCell::GetAbsPos() const
{
    wxPoint p(m_PosX, m_PosY);
    for (wxHtmlCell *parent = m_Parent; parent; parent = parent->m_Parent)
    {
        p.x += parent->m_PosX;
        p.y += parent->m_PosY;
    }
    return p;
}

unsigned wxHtmlCell::GetDepth() const
{
    unsigned d = 0;
    for (wxHtmlCell *p = m_Parent; p; p = p->m_Parent)
        d++;
    return d;
}

bool wxHtmlCell::IsBefore(wxHtmlCell *cell) const
{
    const wxHtmlCell *c1 = this;
    const wxHtmlCell *c2 = cell;
    unsigned d1 = GetDepth();
    unsigned d2 = cell->GetDepth();

    if ( d1 > d2 )
        for (; d1 != d2; d1-- )
            c1 = c1->m_Parent;
    else if ( d1 < d2 )
        for (; d1 != d2; d2-- )
            c2 = c2->m_Parent;

    if ( cell == this )
        return true;

    while ( c1 && c2 )
    {
        if ( c1->m_Parent == c2->m_Parent )
        {
            while ( c1 )
            {
                if ( c1 == c2 )
                    return true;
                c1 = c1->GetNext();
            }
            return false;
        }
        else
        {
            c1 = c1->m_Parent;
            c2 = c2->m_Parent;
        }
    }

    wxFAIL_MSG(_T("Cells are in different trees"));
    return false;
}


//-----------------------------------------------------------------------------
// wxHtmlWordCell
//-----------------------------------------------------------------------------

IMPLEMENT_ABSTRACT_CLASS(wxHtmlWordCell, wxHtmlCell)

wxHtmlWordCell::wxHtmlWordCell(const wxString& word, wxDC& dc) : wxHtmlCell()
{
    m_Word = word;
    dc.GetTextExtent(m_Word, &m_Width, &m_Height, &m_Descent);
    SetCanLiveOnPagebreak(false);
    m_allowLinebreak = true;
}

void wxHtmlWordCell::SetPreviousWord(wxHtmlWordCell *cell)
{
    if ( cell && m_Parent == cell->m_Parent &&
         !wxIsspace(cell->m_Word.Last()) && !wxIsspace(m_Word[0u]) )
    {
        m_allowLinebreak = false;
    }
}

// Splits m_Word into up to three parts according to selection, returns
// substring before, in and after selection and the points (in relative coords)
// where s2 and s3 start:
void wxHtmlWordCell::Split(wxDC& dc,
                           const wxPoint& selFrom, const wxPoint& selTo,
                           unsigned& pos1, unsigned& pos2) const
{
    wxPoint pt1 = (selFrom == wxDefaultPosition) ?
                   wxDefaultPosition : selFrom - GetAbsPos();
    wxPoint pt2 = (selTo == wxDefaultPosition) ?
                   wxPoint(m_Width, wxDefaultCoord) : selTo - GetAbsPos();

    unsigned len = m_Word.length();
    unsigned i = 0;
    pos1 = 0;

    // adjust for cases when the start/end position is completely
    // outside the cell:
    if ( pt1.y < 0 )
        pt1.x = 0;
    if ( pt2.y >= m_Height )
        pt2.x = m_Width;

    // before selection:
#ifdef __WXMAC__
    // implementation using PartialExtents to support fractional widths
    wxArrayInt widths ;
    dc.GetPartialTextExtents(m_Word,widths) ;
    while( i < len && pt1.x >= widths[i] )
        i++ ;
#else // __WXMAC__
    wxCoord charW, charH;
    while ( pt1.x > 0 && i < len )
    {
        dc.GetTextExtent(m_Word[i], &charW, &charH);
        pt1.x -= charW;
        if ( pt1.x >= 0 )
        {
            pos1 += charW;
            i++;
        }
    }
#endif // __WXMAC__/!__WXMAC__

    // in selection:
    unsigned j = i;
#ifdef __WXMAC__
    while( j < len && pt2.x >= widths[j] )
        j++ ;
#else // __WXMAC__
    pos2 = pos1;
    pt2.x -= pos2;
    while ( pt2.x > 0 && j < len )
    {
        dc.GetTextExtent(m_Word[j], &charW, &charH);
        pt2.x -= charW;
        if ( pt2.x >= 0 )
        {
            pos2 += charW;
            j++;
        }
    }
#endif // __WXMAC__/!__WXMAC__

    pos1 = i;
    pos2 = j;
}

void wxHtmlWordCell::SetSelectionPrivPos(wxDC& dc, wxHtmlSelection *s) const
{
    unsigned p1, p2;

    Split(dc,
          this == s->GetFromCell() ? s->GetFromPos() : wxDefaultPosition,
          this == s->GetToCell() ? s->GetToPos() : wxDefaultPosition,
          p1, p2);

    wxPoint p(0, m_Word.length());

    if ( this == s->GetFromCell() )
        p.x = p1; // selection starts here
    if ( this == s->GetToCell() )
        p.y = p2; // selection ends here

    if ( this == s->GetFromCell() )
        s->SetFromPrivPos(p);
    if ( this == s->GetToCell() )
        s->SetToPrivPos(p);
}


static void SwitchSelState(wxDC& dc, wxHtmlRenderingInfo& info,
                           bool toSelection)
{
    wxColour fg = info.GetState().GetFgColour();
    wxColour bg = info.GetState().GetBgColour();

    if ( toSelection )
    {
        dc.SetBackgroundMode(wxSOLID);
        dc.SetTextForeground(info.GetStyle().GetSelectedTextColour(fg));
        dc.SetTextBackground(info.GetStyle().GetSelectedTextBgColour(bg));
        dc.SetBackground(wxBrush(info.GetStyle().GetSelectedTextBgColour(bg),
                                 wxSOLID));
    }
    else
    {
        dc.SetBackgroundMode(wxTRANSPARENT);
        dc.SetTextForeground(fg);
        dc.SetTextBackground(bg);
        dc.SetBackground(wxBrush(bg, wxSOLID));
    }
}


void wxHtmlWordCell::Draw(wxDC& dc, int x, int y,
                          int WXUNUSED(view_y1), int WXUNUSED(view_y2),
                          wxHtmlRenderingInfo& info)
{
#if 0 // useful for debugging
    dc.SetPen(*wxBLACK_PEN);
    dc.DrawRectangle(x+m_PosX,y+m_PosY,m_Width /* VZ: +1? */ ,m_Height);
#endif

    bool drawSelectionAfterCell = false;

    if ( info.GetState().GetSelectionState() == wxHTML_SEL_CHANGING )
    {
        // Selection changing, we must draw the word piecewise:
        wxHtmlSelection *s = info.GetSelection();
        wxString txt;
        int w, h;
        int ofs = 0;

        wxPoint priv = (this == s->GetFromCell()) ?
                           s->GetFromPrivPos() : s->GetToPrivPos();

        // NB: this is quite a hack: in order to compute selection boundaries
        //     (in word's characters) we must know current font, which is only
        //     possible inside rendering code. Therefore we update the
        //     information here and store it in wxHtmlSelection so that
        //     ConvertToText can use it later:
        if ( priv == wxDefaultPosition )
        {
            SetSelectionPrivPos(dc, s);
            priv = (this == s->GetFromCell()) ?
                    s->GetFromPrivPos() : s->GetToPrivPos();
        }

        int part1 = priv.x;
        int part2 = priv.y;

        if ( part1 > 0 )
        {
            txt = m_Word.Mid(0, part1);
            dc.DrawText(txt, x + m_PosX, y + m_PosY);
            dc.GetTextExtent(txt, &w, &h);
            ofs += w;
        }

        SwitchSelState(dc, info, true);

        txt = m_Word.Mid(part1, part2-part1);
        dc.DrawText(txt, ofs + x + m_PosX, y + m_PosY);

        if ( (size_t)part2 < m_Word.length() )
        {
            dc.GetTextExtent(txt, &w, &h);
            ofs += w;
            SwitchSelState(dc, info, false);
            txt = m_Word.Mid(part2);
            dc.DrawText(txt, ofs + x + m_PosX, y + m_PosY);
        }
        else
            drawSelectionAfterCell = true;
    }
    else
    {
        wxHtmlSelectionState selstate = info.GetState().GetSelectionState();
        // Not changing selection state, draw the word in single mode:
        if ( selstate != wxHTML_SEL_OUT &&
             dc.GetBackgroundMode() != wxSOLID )
        {
            SwitchSelState(dc, info, true);
        }
        else if ( selstate == wxHTML_SEL_OUT &&
                  dc.GetBackgroundMode() == wxSOLID )
        {
            SwitchSelState(dc, info, false);
        }
        dc.DrawText(m_Word, x + m_PosX, y + m_PosY);
        drawSelectionAfterCell = (selstate != wxHTML_SEL_OUT);
    }

    // NB: If the text is justified then there is usually some free space
    //     between adjacent cells and drawing the selection only onto cells
    //     would result in ugly unselected spaces. The code below detects
    //     this special case and renders the selection *outside* the sell,
    //     too.
    if ( m_Parent->GetAlignHor() == wxHTML_ALIGN_JUSTIFY &&
         drawSelectionAfterCell )
    {
        wxHtmlCell *nextCell = m_Next;
        while ( nextCell && nextCell->IsFormattingCell() )
            nextCell = nextCell->GetNext();
        if ( nextCell )
        {
            int nextX = nextCell->GetPosX();
            if ( m_PosX + m_Width < nextX )
            {
                dc.SetBrush(dc.GetBackground());
                dc.SetPen(*wxTRANSPARENT_PEN);
                dc.DrawRectangle(x + m_PosX + m_Width, y + m_PosY,
                                 nextX - m_PosX - m_Width, m_Height);
            }
        }
    }
}