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** This file is part of the examples of the Qt Toolkit.
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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);
}