hwUnlitShader/NodeMonitor.h

#ifndef __NodeMonitor_h__
#define __NodeMonitor_h__

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// NodeMonitor.h

//
//
// DESCRIPTION:  This class monitors a given node.
//
// AUTHOR: Christian Laforte
//
//

#include <maya/MFnDagNode.h>
#include <maya/MFnDependencyNode.h>
#include <maya/MString.h>
#include <maya/MNodeMessage.h>
#include <maya/MObject.h>
#include <maya/MSelectionList.h>
#include <maya/MStatus.h>

MObject getObjFromName(MString name, MStatus& stat);

// If a problem occurs, this function returns an empty string.
MString getNameFromObj(MObject obj);

// Classes that implement the NodeMonitorManager interfaces
// can be called back when a node is renamed.
class NodeMonitorManager
{
public:
    virtual void onNodeRenamed(MObject& node, MString oldName, MString newName) = 0;
};

class NodeMonitor
{
public:
    NodeMonitor(NodeMonitorManager* manager = NULL);

    ~NodeMonitor();

    bool watch(MString nodeName);
    bool watch(MObject nodeObj);

    void stopWatching();

    bool dirty();

    void cleanIt();

    void setManager(NodeMonitorManager* manager) { fManager = manager; }

private:
    bool attachCallbacks();

    void detachCallbacks();

    void callbackOccured();

    // Callback functions. Those are called, respectively, when a node is dirty (has changed substantially),
    // or when a node is renamed.
    static void watchedObjectDirtyCallback(void* clientData);

    static void watchedObjectRenamedCallback(MObject & node, void* clientData);


private:
    MString fNodeName;
    bool fIsDirty;

    MCallbackId fRenamedCallbackId;
    MCallbackId fDirtyCallbackId;

    NodeMonitorManager* fManager;
};


#endif // MAYA_ShadingConnection