interface/wx/richtext/richtexthtml.h

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