Qt 5.11 | Qt Widgets | Basic Sort/Filter Model Example | window.cpp Example File

Qt 5.11.3 Reference Documentation

# window.cpp Example File

itemviews/basicsortfiltermodel/window.cpp

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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);
      }