scenetraversal.h

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/*********************************************************************
 *<
    FILE: sceneTraversal.h

    DESCRIPTION: Interface for plugins controlling display traversal

    CREATED BY: John Hutchinson

    HISTORY: November 5 2003

 *> Copyright (c) 2000, All Rights Reserved.
 **********************************************************************/

#pragma once

#include "maxheap.h"
#include "maxtypes.h"
#include "baseinterface.h"

// forward declarations
class NodeIterator;
class ViewExp;
class INode;

#define SCENETRAVERSAL_INTERFACE Interface_ID(0x35380d8c, 0x48e54b8c)

// An interface for controlling the display traversal of the scene
class ISceneTraversal : public BaseInterface
{
public:

    enum IteratorContext
    {
        kDisplay = 0,
        kHitTest = 1
    };

    virtual NodeIterator *GetIterator(ViewExp* vpt, IteratorContext context) = 0;
};

class NodeIterator: public MaxHeapOperators
{
public:
    virtual ~NodeIterator() {;}
    virtual void DeleteThis()=0;    // used to implement { delete this; }
    virtual void Reset() = 0;
    virtual INode *next() = 0;
};