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547 lines
16 KiB
C++
547 lines
16 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: src/gtk/font.cpp
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// Purpose: wxFont for wxGTK
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// Author: Robert Roebling
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// Copyright: (c) 1998 Robert Roebling and Julian Smart
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#include "wx/font.h"
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#ifndef WX_PRECOMP
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#include "wx/log.h"
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#include "wx/utils.h"
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#include "wx/settings.h"
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#include "wx/gdicmn.h"
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#endif
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#include "wx/fontutil.h"
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#include "wx/tokenzr.h"
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#include "wx/gtk/private.h"
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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// the default size (in points) for the fonts
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static const int wxDEFAULT_FONT_SIZE = 12;
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// ----------------------------------------------------------------------------
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// wxFontRefData
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// ----------------------------------------------------------------------------
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class wxFontRefData : public wxGDIRefData
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{
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public:
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// from broken down font parameters, also default ctor
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wxFontRefData(int size = -1,
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wxFontFamily family = wxFONTFAMILY_DEFAULT,
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wxFontStyle style = wxFONTSTYLE_NORMAL,
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wxFontWeight weight = wxFONTWEIGHT_NORMAL,
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bool underlined = false,
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bool strikethrough = false,
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const wxString& faceName = wxEmptyString,
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wxFontEncoding encoding = wxFONTENCODING_DEFAULT);
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wxFontRefData(const wxString& nativeFontInfoString);
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// copy ctor
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wxFontRefData( const wxFontRefData& data );
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virtual ~wxFontRefData();
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// setters: all of them also take care to modify m_nativeFontInfo if we
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// have it so as to not lose the information not carried by our fields
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void SetPointSize(int pointSize);
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void SetFamily(wxFontFamily family);
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void SetStyle(wxFontStyle style);
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void SetWeight(wxFontWeight weight);
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void SetUnderlined(bool underlined);
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void SetStrikethrough(bool strikethrough);
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bool SetFaceName(const wxString& facename);
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void SetEncoding(wxFontEncoding encoding);
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// and this one also modifies all the other font data fields
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void SetNativeFontInfo(const wxNativeFontInfo& info);
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protected:
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// common part of all ctors
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void Init(int pointSize,
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wxFontFamily family,
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wxFontStyle style,
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wxFontWeight weight,
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bool underlined,
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bool strikethrough,
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const wxString& faceName,
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wxFontEncoding encoding);
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// set all fields from (already initialized and valid) m_nativeFontInfo
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void InitFromNative();
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private:
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// The native font info: basically a PangoFontDescription, plus
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// 'underlined' and 'strikethrough' attributes not supported by Pango.
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wxNativeFontInfo m_nativeFontInfo;
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friend class wxFont;
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};
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#define M_FONTDATA ((wxFontRefData*)m_refData)
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// ----------------------------------------------------------------------------
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// wxFontRefData
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// ----------------------------------------------------------------------------
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void wxFontRefData::Init(int pointSize,
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wxFontFamily family,
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wxFontStyle style,
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wxFontWeight weight,
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bool underlined,
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bool strikethrough,
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const wxString& faceName,
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wxFontEncoding WXUNUSED(encoding))
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{
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if (family == wxFONTFAMILY_DEFAULT)
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family = wxFONTFAMILY_SWISS;
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// Create native font info
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m_nativeFontInfo.description = pango_font_description_new();
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// And set its values
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if (!faceName.empty())
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{
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pango_font_description_set_family( m_nativeFontInfo.description,
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wxGTK_CONV_SYS(faceName) );
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}
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else
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{
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SetFamily(family);
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}
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SetStyle( style == wxDEFAULT ? wxFONTSTYLE_NORMAL : style );
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SetPointSize( (pointSize == wxDEFAULT || pointSize == -1)
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? wxDEFAULT_FONT_SIZE
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: pointSize );
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SetWeight( weight == wxDEFAULT ? wxFONTWEIGHT_NORMAL : weight );
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SetUnderlined( underlined );
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SetStrikethrough( strikethrough );
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}
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void wxFontRefData::InitFromNative()
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{
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// Get native info
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PangoFontDescription *desc = m_nativeFontInfo.description;
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// Pango sometimes needs to have a size
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int pango_size = pango_font_description_get_size( desc );
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if (pango_size == 0)
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m_nativeFontInfo.SetPointSize(wxDEFAULT_FONT_SIZE);
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}
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wxFontRefData::wxFontRefData( const wxFontRefData& data )
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: wxGDIRefData()
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{
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// Forces a copy of the internal data. wxNativeFontInfo should probably
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// have a copy ctor and assignment operator to fix this properly but that
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// would break binary compatibility...
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m_nativeFontInfo.FromString(data.m_nativeFontInfo.ToString());
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}
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wxFontRefData::wxFontRefData(int size, wxFontFamily family, wxFontStyle style,
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wxFontWeight weight, bool underlined, bool strikethrough,
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const wxString& faceName,
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wxFontEncoding encoding)
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{
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Init(size, family, style, weight, underlined, strikethrough, faceName, encoding);
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}
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wxFontRefData::wxFontRefData(const wxString& nativeFontInfoString)
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{
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m_nativeFontInfo.FromString( nativeFontInfoString );
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InitFromNative();
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}
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wxFontRefData::~wxFontRefData()
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{
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}
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// ----------------------------------------------------------------------------
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// wxFontRefData SetXXX()
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// ----------------------------------------------------------------------------
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void wxFontRefData::SetPointSize(int pointSize)
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{
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m_nativeFontInfo.SetPointSize(pointSize);
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}
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/*
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NOTE: disabled because pango_font_description_set_absolute_size() and
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wxDC::GetCharHeight() do not mix well: setting with the former a pixel
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size of "30" makes the latter return 36...
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Besides, we need to return GetPointSize() a point size value even if
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SetPixelSize() was used and this would require further changes
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(and use of pango_font_description_get_size_is_absolute in some places).
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bool wxFontRefData::SetPixelSize(const wxSize& pixelSize)
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{
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wxCHECK_MSG( pixelSize.GetWidth() >= 0 && pixelSize.GetHeight() > 0, false,
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"Negative values for the pixel size or zero pixel height are not allowed" );
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if (wx_pango_version_check(1,8,0) != NULL ||
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pixelSize.GetWidth() != 0)
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{
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// NOTE: pango_font_description_set_absolute_size() only sets the font height;
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// if the user set the pixel width of the font explicitly or the pango
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// library is too old, we cannot proceed
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return false;
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}
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pango_font_description_set_absolute_size( m_nativeFontInfo.description,
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pixelSize.GetHeight() * PANGO_SCALE );
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return true;
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}
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*/
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void wxFontRefData::SetFamily(wxFontFamily family)
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{
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m_nativeFontInfo.SetFamily(family);
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}
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void wxFontRefData::SetStyle(wxFontStyle style)
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{
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m_nativeFontInfo.SetStyle(style);
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}
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void wxFontRefData::SetWeight(wxFontWeight weight)
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{
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m_nativeFontInfo.SetWeight(weight);
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}
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void wxFontRefData::SetUnderlined(bool underlined)
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{
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m_nativeFontInfo.SetUnderlined(underlined);
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}
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void wxFontRefData::SetStrikethrough(bool strikethrough)
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{
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m_nativeFontInfo.SetStrikethrough(strikethrough);
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}
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bool wxFontRefData::SetFaceName(const wxString& facename)
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{
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return m_nativeFontInfo.SetFaceName(facename);
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}
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void wxFontRefData::SetEncoding(wxFontEncoding WXUNUSED(encoding))
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{
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// with GTK+ 2 Pango always uses UTF8 internally, we cannot change it
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}
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void wxFontRefData::SetNativeFontInfo(const wxNativeFontInfo& info)
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{
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m_nativeFontInfo = info;
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// set all the other font parameters from the native font info
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InitFromNative();
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}
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// ----------------------------------------------------------------------------
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// wxFont creation
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// ----------------------------------------------------------------------------
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wxFont::wxFont(const wxNativeFontInfo& info)
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{
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Create( info.GetPointSize(),
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info.GetFamily(),
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info.GetStyle(),
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info.GetWeight(),
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info.GetUnderlined(),
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info.GetFaceName(),
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info.GetEncoding() );
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if ( info.GetStrikethrough() )
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SetStrikethrough(true);
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}
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wxFont::wxFont(const wxFontInfo& info)
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{
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m_refData = new wxFontRefData(info.GetPointSize(),
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info.GetFamily(),
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info.GetStyle(),
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info.GetWeight(),
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info.IsUnderlined(),
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info.IsStrikethrough(),
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info.GetFaceName(),
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info.GetEncoding());
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wxSize pixelSize = info.GetPixelSize();
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if ( pixelSize != wxDefaultSize )
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SetPixelSize(pixelSize);
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}
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bool wxFont::Create( int pointSize,
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wxFontFamily family,
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wxFontStyle style,
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wxFontWeight weight,
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bool underlined,
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const wxString& face,
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wxFontEncoding encoding )
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{
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UnRef();
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m_refData = new wxFontRefData(pointSize, family, style, weight,
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underlined, false, face, encoding);
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return true;
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}
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bool wxFont::Create(const wxString& fontname)
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{
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// VZ: does this really happen?
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if ( fontname.empty() )
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{
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*this = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
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return true;
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}
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m_refData = new wxFontRefData(fontname);
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return true;
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}
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wxFont::~wxFont()
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{
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}
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// ----------------------------------------------------------------------------
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// accessors
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// ----------------------------------------------------------------------------
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int wxFont::GetPointSize() const
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{
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wxCHECK_MSG( IsOk(), 0, wxT("invalid font") );
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return M_FONTDATA->m_nativeFontInfo.GetPointSize();
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}
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wxString wxFont::GetFaceName() const
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{
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wxCHECK_MSG( IsOk(), wxEmptyString, wxT("invalid font") );
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return M_FONTDATA->m_nativeFontInfo.GetFaceName();
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}
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wxFontFamily wxFont::DoGetFamily() const
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{
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return M_FONTDATA->m_nativeFontInfo.GetFamily();
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}
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wxFontStyle wxFont::GetStyle() const
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{
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wxCHECK_MSG( IsOk(), wxFONTSTYLE_MAX, wxT("invalid font") );
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return M_FONTDATA->m_nativeFontInfo.GetStyle();
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}
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wxFontWeight wxFont::GetWeight() const
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{
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wxCHECK_MSG( IsOk(), wxFONTWEIGHT_MAX, wxT("invalid font") );
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return M_FONTDATA->m_nativeFontInfo.GetWeight();
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}
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bool wxFont::GetUnderlined() const
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{
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wxCHECK_MSG( IsOk(), false, wxT("invalid font") );
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return M_FONTDATA->m_nativeFontInfo.GetUnderlined();
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}
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bool wxFont::GetStrikethrough() const
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{
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wxCHECK_MSG( IsOk(), false, wxT("invalid font") );
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return M_FONTDATA->m_nativeFontInfo.GetStrikethrough();
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}
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wxFontEncoding wxFont::GetEncoding() const
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{
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wxCHECK_MSG( IsOk(), wxFONTENCODING_SYSTEM, wxT("invalid font") );
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return wxFONTENCODING_UTF8;
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// Pango always uses UTF8... see also SetEncoding()
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}
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const wxNativeFontInfo *wxFont::GetNativeFontInfo() const
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{
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wxCHECK_MSG( IsOk(), NULL, wxT("invalid font") );
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return &(M_FONTDATA->m_nativeFontInfo);
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}
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bool wxFont::IsFixedWidth() const
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{
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wxCHECK_MSG( IsOk(), false, wxT("invalid font") );
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return wxFontBase::IsFixedWidth();
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}
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// ----------------------------------------------------------------------------
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// change font attributes
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// ----------------------------------------------------------------------------
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void wxFont::SetPointSize(int pointSize)
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{
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AllocExclusive();
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M_FONTDATA->SetPointSize(pointSize);
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}
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void wxFont::SetFamily(wxFontFamily family)
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{
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AllocExclusive();
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M_FONTDATA->SetFamily(family);
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}
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void wxFont::SetStyle(wxFontStyle style)
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{
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AllocExclusive();
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M_FONTDATA->SetStyle(style);
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}
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void wxFont::SetWeight(wxFontWeight weight)
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{
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AllocExclusive();
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M_FONTDATA->SetWeight(weight);
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}
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bool wxFont::SetFaceName(const wxString& faceName)
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{
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AllocExclusive();
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return M_FONTDATA->SetFaceName(faceName) &&
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wxFontBase::SetFaceName(faceName);
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}
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void wxFont::SetUnderlined(bool underlined)
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{
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AllocExclusive();
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M_FONTDATA->SetUnderlined(underlined);
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}
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void wxFont::SetStrikethrough(bool strikethrough)
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{
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AllocExclusive();
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M_FONTDATA->SetStrikethrough(strikethrough);
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}
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void wxFont::SetEncoding(wxFontEncoding encoding)
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{
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AllocExclusive();
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M_FONTDATA->SetEncoding(encoding);
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}
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void wxFont::DoSetNativeFontInfo( const wxNativeFontInfo& info )
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{
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AllocExclusive();
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M_FONTDATA->SetNativeFontInfo( info );
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}
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wxGDIRefData* wxFont::CreateGDIRefData() const
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{
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return new wxFontRefData;
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}
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wxGDIRefData* wxFont::CloneGDIRefData(const wxGDIRefData* data) const
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{
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return new wxFontRefData(*static_cast<const wxFontRefData*>(data));
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}
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bool wxFont::GTKSetPangoAttrs(PangoLayout* layout) const
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{
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if (!IsOk() || !(GetUnderlined() || GetStrikethrough()))
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return false;
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PangoAttrList* attrs = pango_attr_list_new();
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PangoAttribute* a;
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#ifndef __WXGTK3__
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if (wx_pango_version_check(1,16,0))
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{
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// a PangoLayout which has leading/trailing spaces with underlined font
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// is not correctly drawn by this pango version: Pango won't underline the spaces.
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// This can be a problem; e.g. wxHTML rendering of underlined text relies on
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// this behaviour. To workaround this problem, we use a special hack here
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// suggested by pango maintainer Behdad Esfahbod: we prepend and append two
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// empty space characters and give them a dummy colour attribute.
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// This will force Pango to underline the leading/trailing spaces, too.
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const char* text = pango_layout_get_text(layout);
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const size_t n = strlen(text);
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if ((n > 0 && text[0] == ' ') || (n > 1 && text[n - 1] == ' '))
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{
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wxCharBuffer buf(n + 6);
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// copy the leading U+200C ZERO WIDTH NON-JOINER encoded in UTF8 format
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memcpy(buf.data(), "\342\200\214", 3);
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// copy the user string
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memcpy(buf.data() + 3, text, n);
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// copy the trailing U+200C ZERO WIDTH NON-JOINER encoded in UTF8 format
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memcpy(buf.data() + 3 + n, "\342\200\214", 3);
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pango_layout_set_text(layout, buf, n + 6);
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// Add dummy attributes (use colour as it's invisible anyhow for 0
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// width spaces) to ensure that the spaces in the beginning/end of the
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// string are underlined too.
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a = pango_attr_foreground_new(0x0057, 0x52A9, 0xD614);
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a->start_index = 0;
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a->end_index = 3;
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pango_attr_list_insert(attrs, a);
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a = pango_attr_foreground_new(0x0057, 0x52A9, 0xD614);
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a->start_index = n + 3;
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a->end_index = n + 6;
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pango_attr_list_insert(attrs, a);
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}
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}
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#endif // !__WXGTK3__
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if (GetUnderlined())
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{
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a = pango_attr_underline_new(PANGO_UNDERLINE_SINGLE);
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pango_attr_list_insert(attrs, a);
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}
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if (GetStrikethrough())
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{
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a = pango_attr_strikethrough_new(true);
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pango_attr_list_insert(attrs, a);
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}
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pango_layout_set_attributes(layout, attrs);
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pango_attr_list_unref(attrs);
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return true;
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}
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