source: src/UIElements/Views/Qt4/Qt3D/ObservedValue_wCallback.hpp@ 7c7c4a

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Last change on this file since 7c7c4a was 7c7c4a, checked in by Frederik Heber <heber@…>, 9 years ago

FIX: All ObservedValue's of GLMoleculeObject_atom/bond/molecule wrapped into vector.

  • the idea is that a GLMoleculeObject may only remove itself _after_ each and every contained Observer has gotten the subjectKilled() signal from the Observables. Only then will destroying the Object and its members thereby not cause any signOff() which try to access Observables or their channels which are no longer present. This can be imagined as a graph where we have to start destroying object at the very bottom.
  • This is the avoid the following conflict: A superior object gets note of a molecule to be removed. It sends the visual representation a signal to remove itself, which causes it to use signOff(). On a parallel track (in another thread) we have the observed object calling subjectKilled() to inform any Observer about its immediate destruction. These two tracks collide. Now, we let first pass all subjectKilled() and when the last Observable has gotten its signal, we begin destroying the visual rep.
  • rerouted signal/slots accordingly.
  • Property mode set to 100644
File size: 1.2 KB
Line 
1/*
2 * ObservedValue_wCallback.hpp
3 *
4 * Created on: Oct 16, 2015
5 * Author: heber
6 */
7
8
9#ifndef OBSERVEDVALUE_WCALLBACK_HPP_
10#define OBSERVEDVALUE_WCALLBACK_HPP_
11
12// include config.h
13#ifdef HAVE_CONFIG_H
14#include <config.h>
15#endif
16
17#include "CodePatterns/ObservedValue.hpp"
18#include "CodePatterns/Observer/Observable.hpp"
19
20/** We derive from ObservedValue in order to tell owning instance about
21 * subjectKilled() having been called.
22 */
23template <class T>
24class ObservedValue_wCallback : public ObservedValue<T>
25{
26public:
27 ObservedValue_wCallback(
28 const Observable * const _owner,
29 const boost::function<T()> &_recalcMethod,
30 const std::string &_name,
31 const T &_initialvalue,
32 const Observable::channels_t &_channels,
33 const boost::function<void()> &_callback) :
34 ObservedValue<T>(_owner, _recalcMethod, _name, _initialvalue, _channels),
35 callback(_callback)
36 {}
37 virtual ~ObservedValue_wCallback()
38 {}
39
40protected:
41 virtual void subjectKilled(Observable *publisher)
42 {
43 ObservedValue<T>::subjectKilled(publisher);
44 callback();
45 }
46
47private:
48 //!> callback function to tell other entity about subjectKilled
49 const boost::function<void()> callback;
50};
51
52#endif /* OBSERVEDVALUE_WCALLBACK_HPP_ */
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