Qt 5.11 | Qt SQL | Drill Down Example | informationwindow.cpp Example File

Qt 5.11.3 Reference Documentation

# informationwindow.cpp Example File

drilldown/informationwindow.cpp

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      #include "informationwindow.h"

      InformationWindow::InformationWindow(int id, QSqlRelationalTableModel *items,
                                           QWidget *parent)
          : QDialog(parent)
      {
          QLabel *itemLabel = new QLabel(tr("Item: "));
          QLabel *descriptionLabel = new QLabel(tr("Description: "));
          QLabel *imageFileLabel = new QLabel(tr("Image file: "));

          createButtons();

          itemText = new QLabel;
          descriptionEditor = new QTextEdit;

          imageFileEditor = new QComboBox;
          imageFileEditor->setModel(items->relationModel(1));
          imageFileEditor->setModelColumn(items->relationModel(1)->fieldIndex("file"));

          mapper = new QDataWidgetMapper(this);
          mapper->setModel(items);
          mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
          mapper->setItemDelegate(new QSqlRelationalDelegate(mapper));
          mapper->addMapping(imageFileEditor, 1);
          mapper->addMapping(itemText, 2, "text");
          mapper->addMapping(descriptionEditor, 3);
          mapper->setCurrentIndex(id);

          connect(descriptionEditor, &QTextEdit::textChanged, [=]() {
              enableButtons();
          });
          connect(imageFileEditor, QOverload<int>::of(&QComboBox::currentIndexChanged), [=]() {
              enableButtons();
          });

          QFormLayout *formLayout = new QFormLayout;
          formLayout->addRow(itemLabel, itemText);
          formLayout->addRow(imageFileLabel, imageFileEditor);
          formLayout->addRow(descriptionLabel, descriptionEditor);

          QVBoxLayout *layout = new QVBoxLayout;
          layout->addLayout(formLayout);
          layout->addWidget(buttonBox);
          setLayout(layout);

          itemId = id;
          displayedImage = imageFileEditor->currentText();

          setWindowFlags(Qt::Window);
          enableButtons(false);
          setWindowTitle(itemText->text());
      }

      int InformationWindow::id() const
      {
          return itemId;
      }

      void InformationWindow::revert()
      {
          mapper->revert();
          enableButtons(false);
      }

      void InformationWindow::submit()
      {
          QString newImage(imageFileEditor->currentText());

          if (displayedImage != newImage) {
              displayedImage = newImage;
              emit imageChanged(itemId, newImage);
          }

          mapper->submit();
          mapper->setCurrentIndex(itemId);

          enableButtons(false);
      }

      void InformationWindow::createButtons()
      {
          closeButton = new QPushButton(tr("&Close"));
          revertButton = new QPushButton(tr("&Revert"));
          submitButton = new QPushButton(tr("&Submit"));

          closeButton->setDefault(true);

          connect(closeButton, &QPushButton::clicked, this, &InformationWindow::close);
          connect(revertButton, &QPushButton::clicked, this, &InformationWindow::revert);
          connect(submitButton, &QPushButton::clicked, this, &InformationWindow::submit);

          buttonBox = new QDialogButtonBox(this);
          buttonBox->addButton(submitButton, QDialogButtonBox::AcceptRole);
          buttonBox->addButton(revertButton, QDialogButtonBox::ResetRole);
          buttonBox->addButton(closeButton, QDialogButtonBox::RejectRole);
      }

      void InformationWindow::enableButtons(bool enable)
      {
          revertButton->setEnabled(enable);
          submitButton->setEnabled(enable);
      }