ClusterGraphObserver.h

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#pragma once
 
#include <ogdf/basic/List.h>
#include <ogdf/cluster/ClusterGraph.h>
 
namespace ogdf {
 
class OGDF_EXPORT ClusterGraphObserver {
    friend class ClusterGraph;
 
public:
    ClusterGraphObserver() : m_pClusterGraph(nullptr) { }
 
    explicit ClusterGraphObserver(const ClusterGraph* CG) : m_pClusterGraph(CG) {
        m_itCGList = CG->registerObserver(this);
    }
 
    virtual ~ClusterGraphObserver() {
        if (m_pClusterGraph) {
            m_pClusterGraph->unregisterObserver(m_itCGList);
        }
    }
 
    // associates structure with different graph
    void reregister(const ClusterGraph* pCG) {
        //small speedup: check if == m_pGraph
        if (m_pClusterGraph) {
            m_pClusterGraph->unregisterObserver(m_itCGList);
        }
        if ((m_pClusterGraph = pCG) != nullptr) {
            m_itCGList = pCG->registerObserver(this);
        }
    }
 
    virtual void clusterDeleted(cluster v) = 0;
    virtual void clusterAdded(cluster v) = 0;
#if 0
    virtual void cleared()                 = 0;//Graph cleared
#endif
 
    const ClusterGraph* getGraph() const { return m_pClusterGraph; }
 
protected:
    const ClusterGraph* m_pClusterGraph; //underlying clustergraph
 
    //List entry in cluster graphs list of all registered observers
    ListIterator<ClusterGraphObserver*> m_itCGList;
};
 
}