window.cpp Example File

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 #include <QtWidgets>

 #include "window.h"

 Window::Window()
 {
     proxyModel = new QSortFilterProxyModel;

     sourceView = new QTreeView;
     sourceView->setRootIsDecorated(false);
     sourceView->setAlternatingRowColors(true);

     proxyView = new QTreeView;
     proxyView->setRootIsDecorated(false);
     proxyView->setAlternatingRowColors(true);
     proxyView->setModel(proxyModel);
     proxyView->setSortingEnabled(true);

     sortCaseSensitivityCheckBox = new QCheckBox(tr("Case sensitive sorting"));
     filterCaseSensitivityCheckBox = new QCheckBox(tr("Case sensitive filter"));

     filterPatternLineEdit = new QLineEdit;
     filterPatternLabel = new QLabel(tr("&Filter pattern:"));
     filterPatternLabel->setBuddy(filterPatternLineEdit);

     filterSyntaxComboBox = new QComboBox;
     filterSyntaxComboBox->addItem(tr("Regular expression"), QRegExp::RegExp);
     filterSyntaxComboBox->addItem(tr("Wildcard"), QRegExp::Wildcard);
     filterSyntaxComboBox->addItem(tr("Fixed string"), QRegExp::FixedString);
     filterSyntaxLabel = new QLabel(tr("Filter &syntax:"));
     filterSyntaxLabel->setBuddy(filterSyntaxComboBox);

     filterColumnComboBox = new QComboBox;
     filterColumnComboBox->addItem(tr("Subject"));
     filterColumnComboBox->addItem(tr("Sender"));
     filterColumnComboBox->addItem(tr("Date"));
     filterColumnLabel = new QLabel(tr("Filter &column:"));
     filterColumnLabel->setBuddy(filterColumnComboBox);

     connect(filterPatternLineEdit, SIGNAL(textChanged(QString)),
             this, SLOT(filterRegExpChanged()));
     connect(filterSyntaxComboBox, SIGNAL(currentIndexChanged(int)),
             this, SLOT(filterRegExpChanged()));
     connect(filterColumnComboBox, SIGNAL(currentIndexChanged(int)),
             this, SLOT(filterColumnChanged()));
     connect(filterCaseSensitivityCheckBox, SIGNAL(toggled(bool)),
             this, SLOT(filterRegExpChanged()));
     connect(sortCaseSensitivityCheckBox, SIGNAL(toggled(bool)),
             this, SLOT(sortChanged()));

     sourceGroupBox = new QGroupBox(tr("Original Model"));
     proxyGroupBox = new QGroupBox(tr("Sorted/Filtered Model"));

     QHBoxLayout *sourceLayout = new QHBoxLayout;
     sourceLayout->addWidget(sourceView);
     sourceGroupBox->setLayout(sourceLayout);

     QGridLayout *proxyLayout = new QGridLayout;
     proxyLayout->addWidget(proxyView, 0, 0, 1, 3);
     proxyLayout->addWidget(filterPatternLabel, 1, 0);
     proxyLayout->addWidget(filterPatternLineEdit, 1, 1, 1, 2);
     proxyLayout->addWidget(filterSyntaxLabel, 2, 0);
     proxyLayout->addWidget(filterSyntaxComboBox, 2, 1, 1, 2);
     proxyLayout->addWidget(filterColumnLabel, 3, 0);
     proxyLayout->addWidget(filterColumnComboBox, 3, 1, 1, 2);
     proxyLayout->addWidget(filterCaseSensitivityCheckBox, 4, 0, 1, 2);
     proxyLayout->addWidget(sortCaseSensitivityCheckBox, 4, 2);
     proxyGroupBox->setLayout(proxyLayout);

     QVBoxLayout *mainLayout = new QVBoxLayout;

     mainLayout->addWidget(sourceGroupBox);
     mainLayout->addWidget(proxyGroupBox);

     setLayout(mainLayout);

     setWindowTitle(tr("Basic Sort/Filter Model"));
     resize(500, 450);

     proxyView->sortByColumn(1, Qt::AscendingOrder);
     filterColumnComboBox->setCurrentIndex(1);

     filterPatternLineEdit->setText("Andy|Grace");
     filterCaseSensitivityCheckBox->setChecked(true);
     sortCaseSensitivityCheckBox->setChecked(true);
 }

 void Window::setSourceModel(QAbstractItemModel *model)
 {
     proxyModel->setSourceModel(model);
     sourceView->setModel(model);
 }

 void Window::filterRegExpChanged()
 {
     QRegExp::PatternSyntax syntax =
             QRegExp::PatternSyntax(filterSyntaxComboBox->itemData(
                     filterSyntaxComboBox->currentIndex()).toInt());
     Qt::CaseSensitivity caseSensitivity =
             filterCaseSensitivityCheckBox->isChecked() ? Qt::CaseSensitive
                                                        : Qt::CaseInsensitive;

     QRegExp regExp(filterPatternLineEdit->text(), caseSensitivity, syntax);
     proxyModel->setFilterRegExp(regExp);
 }

 void Window::filterColumnChanged()
 {
     proxyModel->setFilterKeyColumn(filterColumnComboBox->currentIndex());
 }

 void Window::sortChanged()
 {
     proxyModel->setSortCaseSensitivity(
             sortCaseSensitivityCheckBox->isChecked() ? Qt::CaseSensitive
                                                      : Qt::CaseInsensitive);
 }