interface/wx/richtext/richtexthtml.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        richtext/richtexthtml.h
   3 // Purpose:     interface of wxRichTextHTMLHandler
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxRichTextHTMLHandler
  11
  12     Handles HTML output (only) for wxRichTextCtrl content.
  13
  14     The most flexible way to use this class is to create a temporary object and call
  15     its functions directly, rather than use wxRichTextBuffer::SaveFile or
  16     wxRichTextCtrl::SaveFile.
  17
  18     Image handling requires a little extra work from the application, to choose an
  19     appropriate image format for the target HTML viewer and to clean up the temporary
  20     images later.
  21     If you are planning to load the HTML into a standard web browser, you can
  22     specify the handler flag wxRICHTEXT_HANDLER_SAVE_IMAGES_TO_BASE64 (the default)
  23     and no extra work is required: the images will be written with the HTML.
  24
  25     However, if you want wxHTML compatibility, you will need to use
  26     @c wxRICHTEXT_HANDLER_SAVE_IMAGES_TO_MEMORY or
  27     @c wxRICHTEXT_HANDLER_SAVE_IMAGES_TO_FILES.
  28
  29     In this case, you must either call wxRichTextHTMLHandler::DeleteTemporaryImages
  30     before the next load operation, or you must store the image locations and
  31     delete them yourself when appropriate.
  32
  33     You can call wxRichTextHTMLHandler::GetTemporaryImageLocations to
  34     get the array of temporary image names.
  35
  36
  37     @section richtexthtmlhandler_flags Handler flags
  38
  39     The following flags can be used with this handler, via the handler's SetFlags()
  40     function or the buffer or control's SetHandlerFlags() function:
  41
  42     - wxRICHTEXT_HANDLER_SAVE_IMAGES_TO_MEMORY
  43       Images are saved to the memory filesystem: suitable for showing wxHTML windows.
  44     - wxRICHTEXT_HANDLER_SAVE_IMAGES_TO_FILES
  45       Images are saved to temporary files: suitable for showing in wxHTML windows.
  46     - wxRICHTEXT_HANDLER_SAVE_IMAGES_TO_BASE64
  47       Images are written with the HTML files in Base 64 format: suitable for showing
  48       in web browsers.
  49     - wxRICHTEXT_HANDLER_NO_HEADER_FOOTER
  50       Don't include header and footer tags (HTML, HEAD, BODY), so that the HTML
  51       can be used as part of a larger document.
  52     - wxRICHTEXT_HANDLER_USE_CSS
  53       Use CSS where possible, otherwise use workarounds that will show in wxHtmlWindow.
  54
  55     @library{wxrichtext}
  56     @category{richtext}
  57 */
  58 class wxRichTextHTMLHandler : public wxRichTextFileHandler
  59 {
  60 public:
  61     /**
  62         Constructor.
  63     */
  64     wxRichTextHTMLHandler(const wxString& name = "HTML",
  65                           const wxString& ext = "html",
  66                           int type = wxRICHTEXT_TYPE_HTML);
  67
  68     /**
  69         Clears the image locations generated by the last operation.
  70     */
  71     void ClearTemporaryImageLocations();
  72
  73     /**
  74         Deletes the in-memory or temporary files generated by the last operation.
  75     */
  76     bool DeleteTemporaryImages();
  77
  78     /**
  79         Delete the in-memory or temporary files generated by the last operation.
  80         This is a static function that can be used to delete the saved locations
  81         from an earlier operation, for example after the user has viewed the HTML file.
  82     */
  83     static bool DeleteTemporaryImages(int flags,
  84                                       const wxArrayString& imageLocations);
  85
  86     /**
  87         Returns the mapping for converting point sizes to HTML font sizes.
  88     */
  89     wxArrayInt GetFontSizeMapping() const;
  90
  91     /**
  92         Returns the directory used to store temporary image files.
  93     */
  94     const wxString& GetTempDir() const;
  95
  96     /**
  97         Returns the image locations for the last operation.
  98     */
  99     const wxArrayString& GetTemporaryImageLocations() const;
 100
 101     /**
 102         Reset the file counter, in case, for example, the same names are required each
 103         time.
 104     */
 105     static void SetFileCounter(int counter);
 106
 107     /**
 108         Sets the mapping for converting point sizes to HTML font sizes.
 109
 110         There should be 7 elements, one for each HTML font size, each element
 111         specifying the maximum point size for that HTML font size.
 112         For example:
 113         @code
 114         wxArrayInt fontSizeMapping;
 115         fontSizeMapping.Add(7);
 116         fontSizeMapping.Add(9);
 117         fontSizeMapping.Add(11);
 118         fontSizeMapping.Add(12);
 119         fontSizeMapping.Add(14);
 120         fontSizeMapping.Add(22);
 121         fontSizeMapping.Add(100);
 122
 123         htmlHandler.SetFontSizeMapping(fontSizeMapping);
 124         @endcode
 125     */
 126     void SetFontSizeMapping(const wxArrayInt& fontSizeMapping);
 127
 128     /**
 129         Sets the directory for storing temporary files.
 130         If empty, the system temporary directory will be used.
 131     */
 132     void SetTempDir(const wxString& tempDir);
 133
 134     /**
 135         Sets the list of image locations generated by the last operation.
 136     */
 137     void SetTemporaryImageLocations(const wxArrayString& locations);
 138
 139 protected:
 140     /**
 141         Saves the buffer content to the HTML stream.
 142     */
 143     virtual bool DoSaveFile(wxRichTextBuffer* buffer, wxOutputStream& stream);
 144 };
 145