Hello,

could someone of you explain me why the value of a spinBox is increased or decreased 3 times, if I only click once on it?
I have created my form with Qt Designer and then connected the SIGNAL of spinBox to the member function of this form:
Qt Code: 
  1. connect(ui_inputSpinBox_PopSize, SIGNAL(valueChanged(int)), this , SLOT(changePopulationSize()));
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and the function looks like this:

Qt Code: 
  1. // this function will be called as soon as the user will use the "Population size" checkbox
  2.  
  3. void mainFrame::changePopulationSize(){
  4. 	if(getMode() == Recombination){
  5. 	PopSize = ui_inputSpinBox_PopSize->value();
  6.  
  7. 	// create an additional individual, if the PopSize will be incremented
  8. 			if (lastNrOfPop < PopSize){
  9. 				IndividualT<double> *individuum = new IndividualT<double>(ChromosomeT<double>(1), ChromosomeT<double>(1 ));
  10. 						// first get the corresponding available range, where the individuals can be placed
  11. 					unsigned index=	objFunction;
  12. 					double rangex1[2] = {list_of_optProblems[index]->range_x1[0], list_of_optProblems[index]->range_x1[1]};
  13. 					double rangex2[2] = {list_of_optProblems[index]->range_x2[0], list_of_optProblems[index]->range_x2[1]};
  14.  
  15. 				(*individuum)[0].initialize(rangex1[0], rangex1[1]);
  16. 				(*individuum)[1].initialize(rangex2[0], rangex2[1]);
  17. 				(*parents).append(*individuum);
  18. 			}
  19.  
  20. 			// delete an individual, if the PopSize will be decremented
  21. 			else if(lastNrOfPop > PopSize){
  22. 				if(getMode() == Recombination){
  23. 					(*parents).remove(parents->size()-1);
  24. 				}
  25. 			}
  26. 			lastNrOfPop = PopSize;
  27. 			drawIndividuals();		// draw the QwtPlotMarkers, which represent the individuals
  28. 	}
  29. 	else return;
  30.  
  31. }
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Can you see the reason for this strange behaviour?

best regards,

Vitali