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extension.h

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#ifndef __INK_EXTENSION_H__
#define __INK_EXTENSION_H__

/** \file
 * Frontend to certain, possibly pluggable, actions.
 */

/*
 * Authors:
 *   Ted Gould <ted@gould.cx>
 *
 * Copyright (C) 2002-2005 Authors
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#include <ostream>
#include <fstream>
#include <vector>
#include <gtkmm/widget.h>
#include <glibmm/ustring.h>
#include "xml/repr.h"
#include "extension/extension-forward.h"

/** The key that is used to identify that the I/O should be autodetected */
00026 #define SP_MODULE_KEY_AUTODETECT "autodetect"
/** This is the key for the SVG input module */
00028 #define SP_MODULE_KEY_INPUT_SVG "org.inkscape.input.svg"
#define SP_MODULE_KEY_INPUT_SVGZ "org.inkscape.input.svgz"
/** Specifies the input module that should be used if none are selected */
00031 #define SP_MODULE_KEY_INPUT_DEFAULT SP_MODULE_KEY_AUTODETECT
/** The key for outputing standard W3C SVG */
00033 #define SP_MODULE_KEY_OUTPUT_SVG "org.inkscape.output.svg.plain"
#define SP_MODULE_KEY_OUTPUT_SVGZ "org.inkscape.output.svgz.plain"
/** This is an output file that has SVG data with the Sodipodi namespace extensions */
00036 #define SP_MODULE_KEY_OUTPUT_SVG_INKSCAPE "org.inkscape.output.svg.inkscape"
#define SP_MODULE_KEY_OUTPUT_SVGZ_INKSCAPE "org.inkscape.output.svgz.inkscape"
/** Which output module should be used? */
00039 #define SP_MODULE_KEY_OUTPUT_DEFAULT SP_MODULE_KEY_AUTODETECT

/** Defines the key for Postscript printing */
00042 #define SP_MODULE_KEY_PRINT_PS    "org.inkscape.print.ps"
/** Defines the key for LaTeX printing */
00044 #define SP_MODULE_KEY_PRINT_LATEX    "org.inkscape.print.latex"
/** Defines the key for printing with GNOME Print */
00046 #define SP_MODULE_KEY_PRINT_GNOME "org.inkscape.print.gnome"
/** Defines the key for printing under Win32 */
00048 #define SP_MODULE_KEY_PRINT_WIN32 "org.inkscape.print.win32"
#ifdef WIN32
/** Defines the default printing to use */
#define SP_MODULE_KEY_PRINT_DEFAULT  SP_MODULE_KEY_PRINT_WIN32
#else
#ifdef WITH_GNOME_PRINT
/** Defines the default printing to use */
#define SP_MODULE_KEY_PRINT_DEFAULT  SP_MODULE_KEY_PRINT_GNOME
#else
/** Defines the default printing to use */
00058 #define SP_MODULE_KEY_PRINT_DEFAULT  SP_MODULE_KEY_PRINT_PS
#endif
#endif

/** Mime type for SVG */
00063 #define MIME_SVG "image/svg+xml"

/** Name of the extension error file */
00066 #define EXTENSION_ERROR_LOG_FILENAME  "extension-errors.log"

namespace Inkscape {
namespace Extension {

/** The object that is the basis for the Extension system.  This object
    contains all of the information that all Extension have.  The
    individual items are detailed within. This is the interface that
    those who want to _use_ the extensions system should use.  This
    is most likely to be those who are inside the Inkscape program. */
00076 class Extension {
public:
    /** An enumeration to identify if the Extension has been loaded or not. */
00079     typedef enum {
00080         STATE_LOADED,      /**< The extension has been loaded successfully */
00081         STATE_UNLOADED,    /**< The extension has not been loaded */
00082         STATE_DEACTIVATED  /**< The extension is missing something which makes it unusable */
    } state_t;
00084     static std::vector<const gchar *> search_path; /**< A vector of paths to search for extensions */

private:
00087     gchar     *id;                        /**< The unique identifier for the Extension */
00088     gchar     *name;                      /**< A user friendly name for the Extension */
00089     state_t    _state;                    /**< Which state the Extension is currently in */
00090     std::vector<Dependency *>  _deps;     /**< Dependencies for this extension */
00091     static std::ofstream error_file;      /**< This is the place where errors get reported */

protected:
00094     Inkscape::XML::Node *repr;                         /**< The XML description of the Extension */
00095     Implementation::Implementation * imp; /**< An object that holds all the functions for making this work */
00096     ExpirationTimer * timer;              /**< Timeout to unload after a given time */

public:
                  Extension    (Inkscape::XML::Node * in_repr,
                                Implementation::Implementation * in_imp);
    virtual      ~Extension    (void);

    void          set_state    (state_t in_state);
    state_t       get_state    (void);
    bool          loaded       (void);
    virtual bool  check        (void);
    Inkscape::XML::Node *      get_repr     (void);
    gchar *       get_id       (void);
    gchar *       get_name     (void);
    void          deactivate   (void);
    bool          deactivated  (void);
    void          printFailure (Glib::ustring reason);


/* Parameter Stuff */
private:
00117     GSList * parameters; /**< A table to store the parameters for this extension.
                              This only gets created if there are parameters in this
                              extension */

public:
    /** An error class for when a parameter is called on a type it is not */
00123     class param_wrong_type {};
    
    /** An error class for when a parameter is looked for that just 
     * simply doesn't exist */
00127     class param_not_exist {};
    
    /** An error class for when a filename already exists, but the user 
     * doesn't want to overwrite it */
00131     class no_overwrite {};

private:
    void             make_param       (Inkscape::XML::Node * paramrepr);
#if 0
    inline param_t * param_shared     (const gchar * name,
                                       GSList * list);
#endif
public:
    bool             get_param_bool   (const gchar * name,
                                       const Inkscape::XML::Document *   doc = NULL);
    int              get_param_int    (const gchar * name,
                                       const Inkscape::XML::Document *   doc = NULL);
    float            get_param_float  (const gchar * name,
                                       const Inkscape::XML::Document *   doc = NULL);
    const gchar *    get_param_string (const gchar * name,
                                       const Inkscape::XML::Document *   doc = NULL);
    bool             set_param_bool   (const gchar * name,
                                       bool          value,
                                       Inkscape::XML::Document *   doc = NULL);
    int              set_param_int    (const gchar * name,
                                       int           value,
                                       Inkscape::XML::Document *   doc = NULL);
    float            set_param_float  (const gchar * name,
                                       float         value,
                                       Inkscape::XML::Document *   doc = NULL);
    const gchar *    set_param_string (const gchar * name,
                                       const gchar * value,
                                       Inkscape::XML::Document *   doc = NULL);

    /* Error file handling */
public:
    static void      error_file_open  (void);
    static void      error_file_close (void);

public:
    Gtk::Widget *    autogui (void);
    Glib::ustring *  paramString (void);
};



/*

This is a prototype for how collections should work.  Whoever gets
around to implementing this gets to decide what a 'folder' and an
'item' really is.  That is the joy of implementing it, eh?

class Collection : public Extension {

public:
    folder  get_root (void);
    int     get_count (folder);
    thumbnail get_thumbnail(item);
    item[]  get_items(folder);
    folder[]  get_folders(folder);
    metadata get_metadata(item);
    image   get_image(item);

};
*/

}  /* namespace Extension */
}  /* namespace Inkscape */

#endif /* __INK_EXTENSION_H__ */

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :

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