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# window.cpp Example File
itemviews/basicsortfiltermodel/window.cpp

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     #include <QtGui>

     #include "window.h"

     Window::Window()
     {
         proxyModel = new QSortFilterProxyModel;
         proxyModel->setDynamicSortFilter(true);

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

         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(const 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()));

         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);
     }