- Qt 5.5
- Qt Widgets
- Basic Sort/Filter Model Example
- window.cpp Example File
- Qt 5.5.1 Reference Documentation

# window.cpp Example File

itemviews/basicsortfiltermodel/window.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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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);
    }