window.h Example File
itemviews/basicsortfiltermodel/window.h

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 #ifndef WINDOW_H
 #define WINDOW_H

 #include <QWidget>

 class QAbstractItemModel;
 class QCheckBox;
 class QComboBox;
 class QGroupBox;
 class QLabel;
 class QLineEdit;
 class QSortFilterProxyModel;
 class QTreeView;

 class Window : public QWidget
 {
     Q_OBJECT

 public:
     Window();

     void setSourceModel(QAbstractItemModel *model);

 private slots:
     void filterRegExpChanged();
     void filterColumnChanged();
     void sortChanged();

 private:
     QSortFilterProxyModel *proxyModel;

     QGroupBox *sourceGroupBox;
     QGroupBox *proxyGroupBox;
     QTreeView *sourceView;
     QTreeView *proxyView;
     QCheckBox *filterCaseSensitivityCheckBox;
     QCheckBox *sortCaseSensitivityCheckBox;
     QLabel *filterPatternLabel;
     QLabel *filterSyntaxLabel;
     QLabel *filterColumnLabel;
     QLineEdit *filterPatternLineEdit;
     QComboBox *filterSyntaxComboBox;
     QComboBox *filterColumnComboBox;
 };

 #endif