include/wx/richtext/richtexthtml.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/richtext/richtexthtml.h
   3 // Purpose:     HTML I/O for wxRichTextCtrl
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     2005-09-30
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_RICHTEXTHTML_H_
  13 #define _WX_RICHTEXTHTML_H_
  14
  15 /*!
  16  * Includes
  17  */
  18
  19 #include "wx/richtext/richtextbuffer.h"
  20
  21 // Use CSS styles where applicable, otherwise use non-CSS workarounds
  22 #define wxRICHTEXT_HANDLER_USE_CSS 0x1000
  23
  24 /*!
  25  * wxRichTextHTMLHandler
  26  */
  27
  28 class WXDLLIMPEXP_RICHTEXT wxRichTextHTMLHandler: public wxRichTextFileHandler
  29 {
  30     DECLARE_CLASS(wxRichTextHTMLHandler)
  31 public:
  32     wxRichTextHTMLHandler(const wxString& name = wxT("HTML"), const wxString& ext = wxT("html"), int type = wxRICHTEXT_TYPE_HTML);
  33
  34     /// Can we save using this handler?
  35     virtual bool CanSave() const { return true; }
  36
  37     /// Can we load using this handler?
  38     virtual bool CanLoad() const { return false; }
  39
  40     /// Can we handle this filename (if using files)? By default, checks the extension.
  41     virtual bool CanHandle(const wxString& filename) const;
  42
  43 // Accessors and operations unique to this handler
  44
  45     /// Set and get the list of image locations generated by the last operation
  46     void SetTemporaryImageLocations(const wxArrayString& locations) { m_imageLocations = locations; }
  47     const wxArrayString& GetTemporaryImageLocations() const { return m_imageLocations; }
  48
  49     /// Clear the image locations generated by the last operation
  50     void ClearTemporaryImageLocations() { m_imageLocations.Clear(); }
  51
  52     /// Delete the in-memory or temporary files generated by the last operation
  53     bool DeleteTemporaryImages();
  54
  55     /// Delete the in-memory or temporary files generated by the last operation. This is a static
  56     /// function that can be used to delete the saved locations from an earlier operation,
  57     /// for example after the user has viewed the HTML file.
  58     static bool DeleteTemporaryImages(int flags, const wxArrayString& imageLocations);
  59
  60     /// Reset the file counter, in case, for example, the same names are required each time
  61     static void SetFileCounter(int counter) { sm_fileCounter = counter; }
  62
  63     /// Set and get the directory for storing temporary files. If empty, the system
  64     /// temporary directory will be used.
  65     void SetTempDir(const wxString& tempDir) { m_tempDir = tempDir; }
  66     const wxString& GetTempDir() const { return m_tempDir; }
  67
  68     /// Set and get mapping from point size to HTML font size. There should be 7 elements,
  69     /// one for each HTML font size, each element specifying the maximum point size for that
  70     /// HTML font size. E.g. 8, 10, 13, 17, 22, 29, 100
  71     void SetFontSizeMapping(const wxArrayInt& fontSizeMapping) { m_fontSizeMapping = fontSizeMapping; }
  72     wxArrayInt GetFontSizeMapping() const { return m_fontSizeMapping; }
  73
  74 protected:
  75
  76 // Implementation
  77
  78 #if wxUSE_STREAMS
  79     virtual bool DoLoadFile(wxRichTextBuffer *buffer, wxInputStream& stream);
  80     virtual bool DoSaveFile(wxRichTextBuffer *buffer, wxOutputStream& stream);
  81
  82     /// Output character formatting
  83     void BeginCharacterFormatting(const wxTextAttr& currentStyle, const wxTextAttr& thisStyle, const wxTextAttr& paraStyle, wxTextOutputStream& stream );
  84     void EndCharacterFormatting(const wxTextAttr& currentStyle, const wxTextAttr& thisStyle, const wxTextAttr& paraStyle, wxTextOutputStream& stream );
  85
  86     /// Output paragraph formatting
  87     void BeginParagraphFormatting(const wxTextAttr& currentStyle, const wxTextAttr& thisStyle, wxTextOutputStream& stream);
  88     void EndParagraphFormatting(const wxTextAttr& currentStyle, const wxTextAttr& thisStyle, wxTextOutputStream& stream);
  89
  90     /// Output font tag
  91     void OutputFont(const wxTextAttr& style, wxTextOutputStream& stream);
  92
  93     /// Closes lists to level (-1 means close all)
  94     void CloseLists(int level, wxTextOutputStream& str);
  95
  96     /// Writes an image to its base64 equivalent, or to the memory filesystem, or to a file
  97     void WriteImage(wxRichTextImage* image, wxOutputStream& stream);
  98
  99     /// Converts from pt to size property compatible height
 100     long PtToSize(long size);
 101
 102     /// Typical base64 encoder
 103     wxChar* b64enc(unsigned char* input, size_t in_len);
 104
 105     /// Gets the mime type of the given wxBITMAP_TYPE
 106     const wxChar* GetMimeType(int imageType);
 107
 108     /// Gets the html equivalent of the specified value
 109     wxString GetAlignment(const wxTextAttr& thisStyle);
 110
 111     /// Generates &nbsp; array for indentations
 112     wxString SymbolicIndent(long indent);
 113
 114     /// Finds the html equivalent of the specified bullet
 115     int TypeOfList(const wxTextAttr& thisStyle, wxString& tag);
 116 #endif
 117
 118 // Data members
 119
 120     wxRichTextBuffer* m_buffer;
 121
 122     /// Indentation values of the table tags
 123     wxArrayInt      m_indents;
 124
 125     /// Stack of list types: 0 = ol, 1 = ul
 126     wxArrayInt      m_listTypes;
 127
 128     /// Is there any opened font tag?
 129     bool            m_font;
 130
 131     /// Are we in a table?
 132     bool            m_inTable;
 133
 134     /// A list of the image files or in-memory images created by the last operation.
 135     wxArrayString   m_imageLocations;
 136
 137     /// A location for the temporary files
 138     wxString        m_tempDir;
 139
 140     /// A mapping from point size to HTML font size
 141     wxArrayInt      m_fontSizeMapping;
 142
 143     /// A counter for generating filenames
 144     static int      sm_fileCounter;
 145 };
 146
 147 #endif
 148     // _WX_RICHTEXTXML_H_