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, &QLineEdit::textChanged,
              this, &Window::filterRegExpChanged);
      connect(filterSyntaxComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged),
              this, &Window::filterRegExpChanged);
      connect(filterColumnComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged),
              this, &Window::filterColumnChanged);
      connect(filterCaseSensitivityCheckBox, &QAbstractButton::toggled,
              this, &Window::filterRegExpChanged);
      connect(sortCaseSensitivityCheckBox, &QAbstractButton::toggled,
              this, &Window::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);
  }