GR/GR_OptionTable.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Ondrej Kos
 *      Side Effects Software Inc
 *      123 Front Street West, Suite 1401
 *      Toronto, Ontario
 *      Canada   M5J 2M2
 *      416-504-9876
 *
 * NAME:        GR_OptionTable.h ( GR Library, C++)
 *
 * COMMENTS:
 *     This class holds the table of all available option types as well as
 *     the instances of all currently active options.
 */

#ifndef __GR_OptionTable__
#define __GR_OptionTable__

#include "GR_API.h"
#include <UT/UT_SymbolTable.h>
#include <UT/UT_PtrArray.h>
#include <UT/UT_Notifier.h>

class GR_OptionTemplate;
class GR_UserOption;

class GR_API GR_OptionTableEvent
{
public:
    enum GR_OptionTableEventType
    {
        OPTION_ADDED,
        OPTION_DELETED,
        OPTION_CHANGED
    };

    GR_OptionTableEvent( GR_OptionTableEventType type, GR_UserOption *option,
                         int id )
        : myEventType(type), myOption(option), myOptionId(id) {}

    GR_OptionTableEventType      myEventType;
    GR_UserOption               *myOption;
    int                          myOptionId;
};

class GR_API GR_OptionTable
{
public:
                 GR_OptionTable();
    virtual     ~GR_OptionTable();

    // The responsibility to delete a template resides with this method.
    void         addTemplate(GR_OptionTemplate *tplate);

    // Query the templates currently present in the table.
    int          getNumTemplates() const;
    GR_OptionTemplate *getTemplate(int i) const;

    // Query the options currently instantiated.
    int          getNumOptions() const { return myOptions.entries(); }
    const GR_UserOption *getOption(int i) const { return myOptions(i); }

    GR_UserOption       *createOption(const char *type, const char *name);
    bool                 destroyOption(const char *name);
    bool                 renameOption(const char *old_name,
                                      const char *new_name, bool notify);
    void                 optionChanged(const char *name);

    GR_UserOption       *getOption(const char *name);
    int                  getOptionId(const char *name) const;
    GR_UserOption       *getOptionById(int unique_id)
                         {
                             if( unique_id >= 0 && unique_id <
                                     myOptionsByID.entries() )
                                 return myOptionsByID(unique_id);
                             return  0;
                         }

    /// Returns a notifier that distributes events when options are added,
    /// removed or changed.
    UT_NotifierImpl<GR_OptionTableEvent &>
                        &getEventNotifier() { return myEventNotifier; }

    // Method to override the default definition file name.  In order for the
    // default definitions to be loaded from this file, this must be called
    // before the first instance of this class is created.
    static void  overrideDefinitionFile(const char *filename);

    void         saveDefaultOptionDefinitions();
    void         loadDefaultOptionDefinitions();

    /// Return true if the save/load was successful, and false otherwise.
    bool         saveOptions(ostream &os, int indent = 0) const;
    bool         loadOptions(UT_IStream &is);

private:
    void         addFactoryTemplates();

protected:
    UT_PtrArray<GR_OptionTemplate *>    myTemplates;
    UT_SymbolTable                      myTemplateLUT;

    UT_PtrArray<GR_UserOption *>        myOptions;
    UT_SymbolTable                      myOptionsLUT;

    // A table to allow fast lookup of options by the unique id.
    UT_PtrArray<GR_UserOption *>        myOptionsByID;

    // Object that notifies about option changes.  The int argument
    // means absolutely nothing.
    UT_NotifierImpl<GR_OptionTableEvent &>      myEventNotifier;
};

GR_API extern GR_OptionTable *GRgetOptionTable();

#endif

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