rewrite to avoid unnecessary redraws

[wxWidgets.git] / src / motif / font.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        font.cpp
// Purpose:     wxFont class
// Author:      Julian Smart
// Modified by:
// Created:     17/09/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#ifdef __GNUG__
    #pragma implementation "font.h"
#endif

#ifdef __VMS
#pragma message disable nosimpint
#include "wx/vms_x_fix.h"
#endif
#include <Xm/Xm.h>
#ifdef __VMS
#pragma message enable nosimpint
#endif

#include "wx/defs.h"
#include "wx/string.h"
#include "wx/font.h"
#include "wx/gdicmn.h"
#include "wx/utils.h"       // for wxGetDisplay()
#include "wx/fontutil.h"    // for wxNativeFontInfo

IMPLEMENT_DYNAMIC_CLASS(wxFont, wxGDIObject)

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------

// For every wxFont, there must be a font for each display and scale requested.
// So these objects are stored in wxFontRefData::m_fonts
class wxXFont : public wxObject
{
public:
    wxXFont();
    ~wxXFont();

    WXFontStructPtr     m_fontStruct;   // XFontStruct
    WXFontList          m_fontList;     // Motif XmFontList
    WXDisplay*          m_display;      // XDisplay
    int                 m_scale;        // Scale * 100
};

class wxFontRefData: public wxGDIRefData
{
friend class wxFont;

public:
    wxFontRefData(int size = wxDEFAULT,
                  int family = wxDEFAULT,
                  int style = wxDEFAULT,
                  int weight = wxDEFAULT,
                  bool underlined = FALSE,
                  const wxString& faceName = wxEmptyString,
                  wxFontEncoding encoding = wxFONTENCODING_DEFAULT)
    {
        Init(size, family, style, weight, underlined, faceName, encoding);
    }

    wxFontRefData(const wxFontRefData& data)
    {
        Init(data.m_pointSize, data.m_family, data.m_style, data.m_weight,
             data.m_underlined, data.m_faceName, data.m_encoding);
    }

    ~wxFontRefData();

protected:
    // common part of all ctors
    void Init(int size,
              int family,
              int style,
              int weight,
              bool underlined,
              const wxString& faceName,
              wxFontEncoding encoding);

    // font attributes
    int           m_pointSize;
    int           m_family;
    int           m_style;
    int           m_weight;
    bool          m_underlined;
    wxString      m_faceName;
    wxFontEncoding m_encoding;

    // A list of wxXFonts
    wxList        m_fonts;
};

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// wxXFont
// ----------------------------------------------------------------------------

wxXFont::wxXFont()
{
    m_fontStruct = (WXFontStructPtr) 0;
    m_fontList = (WXFontList) 0;
    m_display = (WXDisplay*) 0;
    m_scale = 100;
}

wxXFont::~wxXFont()
{
    XmFontList fontList = (XmFontList) m_fontList;

    XmFontListFree (fontList);

    // TODO: why does freeing the font produce a segv???
    // Note that XFreeFont wasn't called in wxWin 1.68 either.
    // XFontStruct* fontStruct = (XFontStruct*) m_fontStruct;
    //        XFreeFont((Display*) m_display, fontStruct);
}

// ----------------------------------------------------------------------------
// wxFontRefData
// ----------------------------------------------------------------------------

void wxFontRefData::Init(int pointSize,
                         int family,
                         int style,
                         int weight,
                         bool underlined,
                         const wxString& faceName,
                         wxFontEncoding encoding)
{
    if (family == wxDEFAULT)
        m_family = wxSWISS;
    else
        m_family = family;

    m_faceName = faceName;

    if (style == wxDEFAULT)
        m_style = wxNORMAL;
    else
        m_style = style;

    if (weight == wxDEFAULT)
        m_weight = wxNORMAL;
    else
        m_weight = weight;

    if (pointSize == wxDEFAULT)
        m_pointSize = 12;
    else
        m_pointSize = pointSize;

    m_underlined = underlined;
    m_encoding = encoding;
}

wxFontRefData::~wxFontRefData()
{
    wxNode* node = m_fonts.First();
    while (node)
    {
        wxXFont* f = (wxXFont*) node->Data();
        delete f;
        node = node->Next();
    }
    m_fonts.Clear();
}

// ----------------------------------------------------------------------------
// wxFont
// ----------------------------------------------------------------------------

wxFont::wxFont(const wxNativeFontInfo& info)
{
    Init();

    (void)Create(info.pointSize, info.family, info.style, info.weight,
                 info.underlined, info.faceName, info.encoding);
}

void wxFont::Init()
{
    if ( wxTheFontList )
        wxTheFontList->Append(this);
}

bool wxFont::Create(int pointSize,
                    int family,
                    int style,
                    int weight,
                    bool underlined,
                    const wxString& faceName,
                    wxFontEncoding encoding)
{
    UnRef();
    m_refData = new wxFontRefData(pointSize, family, style, weight,
                                  underlined, faceName, encoding);

    RealizeResource();

    return TRUE;
}

wxFont::~wxFont()
{
    if ( wxTheFontList )
        wxTheFontList->DeleteObject(this);
}

// ----------------------------------------------------------------------------
// change the font attributes
// ----------------------------------------------------------------------------

void wxFont::Unshare()
{
    // Don't change shared data
    if (!m_refData)
    {
        m_refData = new wxFontRefData();
    }
    else
    {
        wxFontRefData* ref = new wxFontRefData(*(wxFontRefData*)m_refData);
        UnRef();
        m_refData = ref;
    }
}

void wxFont::SetPointSize(int pointSize)
{
    Unshare();

    M_FONTDATA->m_pointSize = pointSize;

    RealizeResource();
}

void wxFont::SetFamily(int family)
{
    Unshare();

    M_FONTDATA->m_family = family;

    RealizeResource();
}

void wxFont::SetStyle(int style)
{
    Unshare();

    M_FONTDATA->m_style = style;

    RealizeResource();
}

void wxFont::SetWeight(int weight)
{
    Unshare();

    M_FONTDATA->m_weight = weight;

    RealizeResource();
}

void wxFont::SetFaceName(const wxString& faceName)
{
    Unshare();

    M_FONTDATA->m_faceName = faceName;

    RealizeResource();
}

void wxFont::SetUnderlined(bool underlined)
{
    Unshare();

    M_FONTDATA->m_underlined = underlined;

    RealizeResource();
}

void wxFont::SetEncoding(wxFontEncoding encoding)
{
    Unshare();

    M_FONTDATA->m_encoding = encoding;

    RealizeResource();
}

// ----------------------------------------------------------------------------
// query font attributes
// ----------------------------------------------------------------------------

int wxFont::GetPointSize() const
{
    return M_FONTDATA->m_pointSize;
}

int wxFont::GetFamily() const
{
    return M_FONTDATA->m_family;
}

int wxFont::GetStyle() const
{
    return M_FONTDATA->m_style;
}

int wxFont::GetWeight() const
{
    return M_FONTDATA->m_weight;
}

bool wxFont::GetUnderlined() const
{
    return M_FONTDATA->m_underlined;
}

wxString wxFont::GetFaceName() const
{
    wxString str;
    if ( M_FONTDATA )
        str = M_FONTDATA->m_faceName ;
    return str;
}

wxFontEncoding wxFont::GetEncoding() const
{
    return M_FONTDATA->m_encoding;
}

// ----------------------------------------------------------------------------
// real implementation
// ----------------------------------------------------------------------------

// Find an existing, or create a new, XFontStruct
// based on this wxFont and the given scale. Append the
// font to list in the private data for future reference.
wxXFont* wxFont::GetInternalFont(double scale, WXDisplay* display) const
{
    if ( !Ok() )
        return (wxXFont *)NULL;

    long intScale = long(scale * 100.0 + 0.5); // key for wxXFont
    int pointSize = (M_FONTDATA->m_pointSize * 10 * intScale) / 100;

    // search existing fonts first
    wxNode* node = M_FONTDATA->m_fonts.First();
    while (node)
    {
        wxXFont* f = (wxXFont*) node->Data();
        if ((!display || (f->m_display == display)) && (f->m_scale == intScale))
            return f;
        node = node->Next();
    }

    // not found, create a new one
    XFontStruct *font = (XFontStruct *)
                        wxLoadQueryNearestFont(pointSize,
                                               M_FONTDATA->m_family,
                                               M_FONTDATA->m_style,
                                               M_FONTDATA->m_weight,
                                               M_FONTDATA->m_underlined,
                                               wxT(""),
                                               M_FONTDATA->m_encoding);

    if ( !font )
    {
        wxFAIL_MSG( wxT("Could not allocate even a default font -- something is wrong.") );

        return (wxXFont*) NULL;
    }

    wxXFont* f = new wxXFont;
    f->m_fontStruct = (WXFontStructPtr)font;
    f->m_display = ( display ? display : wxGetDisplay() );
    f->m_scale = intScale;
    f->m_fontList = XmFontListCreate ((XFontStruct*) font, XmSTRING_DEFAULT_CHARSET);
    M_FONTDATA->m_fonts.Append(f);

    return f;
}

WXFontStructPtr wxFont::GetFontStruct(double scale, WXDisplay* display) const
{
    wxXFont* f = GetInternalFont(scale, display);

    return (f ? f->m_fontStruct : (WXFontStructPtr) 0);
}

WXFontList wxFont::GetFontList(double scale, WXDisplay* display) const
{
    wxXFont* f = GetInternalFont(scale, display);

    return (f ? f->m_fontList : (WXFontList) 0);
}