Hi,
I have a subclass QSortFilterProxyModel with custom lessThan function to provide sort by specific columns but this function is never called. Maybe You know why?


Qt Code: 
  1. #ifndef CUSTOMSORTFILTERPROXYMODEL_H
  2. #define CUSTOMSORTFILTERPROXYMODEL_H
  3.  
  4. #include <QObject>
  5. #include <QSortFilterProxyModel>
  6. #include <QDebug>
  7.  
  8. class CustomSortFilterProxyModel : public QSortFilterProxyModel
  9. {
  10.     Q_OBJECT
  11.  
  12.     enum Column {
  13.         Title,
  14.         Authors,
  15.         ReleaseDate,
  16.         About,
  17.         Format,
  18.         Image
  19.     };
  20.  
  21. public:
  22.     CustomSortFilterProxyModel();
  23.     ~CustomSortFilterProxyModel();
  24.  
  25. protected:
  26.     bool lessThan(const QModelIndex &left, const QModelIndex &right) const override;
  27.  
  28. private:
  29.     QList< Column > selectedColumns;
  30. };
  31.  
  32. #endif // CUSTOMSORTFILTERPROXYMODEL_H
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Qt Code: 
  1. #include "customsortfilterproxymodel.h"
  2.  
  3. CustomSortFilterProxyModel::CustomSortFilterProxyModel()
  4. {
  5.  
  6. }
  7.  
  8. CustomSortFilterProxyModel::~CustomSortFilterProxyModel()
  9. {
  10.  
  11. }
  12.  
  13. bool CustomSortFilterProxyModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
  14. {
  15.     // never called, why?
  16.     qDebug()<< "Custom Sort Filter Proxy Model :: lessThan";
  17.     qDebug()<< "colums size: " << selectedColumns.size();
  18.  
  19.     return false;
  20. }
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and in mainwindow
Qt Code: 
  1. proxyModel.setSourceModel( &customTableModel );
  2. ui->tableView->setModel( &proxyModel );
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