OP/OP_SpareParms.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:
 *      Side Effects Software Inc
 *      123 Front Street West, Suite 1401
 *      Toronto, Ontario
 *      Canada   M5J 2M2
 *      416-504-9876
 *
 * NAME:        OP_SpareParms.h ( OP Library, C++)
 *
 * COMMENTS:    Cache of spare parameter dialog scripts.  Each cache entry has:
 *              - The PRM_ScriptPage
 *              - The PRM_ScriptImports
 *              - The PRM_Template list
 *
 *  This class is kept in a per-operator cache, allowing multiple nodes to
 *  share templates etc. if they have the same spare parameters.
 */

#ifndef __OP_SpareParms__
#define __OP_SpareParms__

#include "OP_API.h"
#include <SYS/SYS_Types.h>
#include <UT/UT_String.h>
#include <UT/UT_HashTable.h>
#include <PRM/PRM_Default.h>

class UT_IntArray;
class UT_IStream;
class OP_SpareParmCache;
class OP_Operator;
class PRM_ScriptPage;
class PRM_ScriptImports;
class PRM_Template;

class OP_API OP_SpareParms
{
public:
                         OP_SpareParms(OP_SpareParmCache *cache,
                                       UT_IStream &is,
                                       OP_Operator *op,
                                       const char *key);

    bool                 isValid() const        { return myPage != 0; }
    int                  bumpRef(int dir);
    PRM_ScriptPage      *getScriptPage()        { return myPage; }
    PRM_Template        *getSpareTemplates()    { return mySpareTemplates; }
    PRM_Template        *getLayoutTemplates()   { return myLayoutTemplates; }
    PRM_ScriptImports   *getImports()           { return myImports; }
    const char          *getKey()               { return myKey; }

    // The Id for this class is a unique integer value >= 0 that allows us
    // to safely and uniquely identify an instance of this class without
    // worrying about pointer reuse.
    int                  getId() const          { return myId; }

private:
    // These should only be deleted through bumpRef calls.
                        ~OP_SpareParms();

    // Turn our parsed script into spare and layout template arrays. We use
    // the operator to supply the base parameter information.
    void                 createTemplates(OP_Operator *op);
    // Use the base templates to fix up the layout templates, and possibly
    // fill in a spare templates array. Works for top level or multiparm
    // templates. Returns true if the layout templates and base templates
    // are exactly the same.
    bool                 createTemplates(PRM_Template *basetplate,
                                         PRM_Template *laytplate,
                                         PRM_Template *sparetplate,
                                         bool doingmultiparm);
    // Clears the key value, for when we stash this spare parms.
    void                 clearKey();

    OP_SpareParmCache   *myCache;
    PRM_ScriptPage      *myPage;
    PRM_ScriptImports   *myImports;
    PRM_Template        *mySpareTemplates;
    PRM_Template        *myLayoutTemplates;
    PRM_Default          myStandardFolderDefaults[2];
    PRM_Default          myEmptyFolderDefaults[2];
    UT_String            myKey;
    int                  myRefCount;
    int                  myId;

    friend class         OP_SpareParmCache;
};

class OP_API OP_SpareParmCache
{
public:
                         OP_SpareParmCache();

    OP_SpareParms       *createSpareParms(UT_IStream &is, OP_Operator *op);

    // Called only by bumpRef()
    void                 removeSpareParms(OP_SpareParms *parms);

    // Increment or decrement the ref count on this cache.
    int                  bumpRef(int dir);

    // Move all our spare parms from myCache into myStash.
    void                 stashSpareParms();

    // Recreate the parm templates for all OP_SpareParms in this cache.
    void                 recreateStashedSpareParms(OP_Operator *op);

private:
    // These should only be deleted through bumpRef calls.
                        ~OP_SpareParmCache();

    UT_HashTable                         myCache;
    UT_PtrArray<OP_SpareParms *>         myStash;
    int                                  myRefCount;
};

#endif

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