Qt 5.11 | Qt Widgets | Drop Site Example | dropsitewindow.cpp Example File

Qt 5.11.3 Reference Documentation

# dropsitewindow.cpp Example File

draganddrop/dropsite/dropsitewindow.cpp

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      #include <QtWidgets>

      #include "droparea.h"
      #include "dropsitewindow.h"

      DropSiteWindow::DropSiteWindow()
      {
          abstractLabel = new QLabel(tr("This example accepts drags from other "
                                        "applications and displays the MIME types "
                                        "provided by the drag object."));
          abstractLabel->setWordWrap(true);
          abstractLabel->adjustSize();

          dropArea = new DropArea;
          connect(dropArea, &DropArea::changed,
                  this, &DropSiteWindow::updateFormatsTable);

          QStringList labels;
          labels << tr("Format") << tr("Content");

          formatsTable = new QTableWidget;
          formatsTable->setColumnCount(2);
          formatsTable->setEditTriggers(QAbstractItemView::NoEditTriggers);
          formatsTable->setHorizontalHeaderLabels(labels);
          formatsTable->horizontalHeader()->setStretchLastSection(true);

          clearButton = new QPushButton(tr("Clear"));
          quitButton = new QPushButton(tr("Quit"));

          buttonBox = new QDialogButtonBox;
          buttonBox->addButton(clearButton, QDialogButtonBox::ActionRole);
          buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

          connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close);
          connect(clearButton, &QAbstractButton::clicked, dropArea, &DropArea::clear);

          QVBoxLayout *mainLayout = new QVBoxLayout(this);
          mainLayout->addWidget(abstractLabel);
          mainLayout->addWidget(dropArea);
          mainLayout->addWidget(formatsTable);
          mainLayout->addWidget(buttonBox);

          setWindowTitle(tr("Drop Site"));
          setMinimumSize(350, 500);
      }

      void DropSiteWindow::updateFormatsTable(const QMimeData *mimeData)
      {
          formatsTable->setRowCount(0);
          if (!mimeData)
              return;

          for (const QString &format : mimeData->formats()) {
              QTableWidgetItem *formatItem = new QTableWidgetItem(format);
              formatItem->setFlags(Qt::ItemIsEnabled);
              formatItem->setTextAlignment(Qt::AlignTop | Qt::AlignLeft);

              QString text;
              if (format == QLatin1String("text/plain")) {
                  text = mimeData->text().simplified();
              } else if (format == QLatin1String("text/html")) {
                  text = mimeData->html().simplified();
              } else if (format == QLatin1String("text/uri-list")) {
                  QList<QUrl> urlList = mimeData->urls();
                  for (int i = 0; i < urlList.size() && i < 32; ++i)
                      text.append(urlList.at(i).toString() + QLatin1Char(' '));
              } else {
                  QByteArray data = mimeData->data(format);
                  for (int i = 0; i < data.size() && i < 32; ++i)
                      text.append(QStringLiteral("%1 ").arg(uchar(data[i]), 2, 16, QLatin1Char('0')).toUpper());
              }

              int row = formatsTable->rowCount();
              formatsTable->insertRow(row);
              formatsTable->setItem(row, 0, new QTableWidgetItem(format));
              formatsTable->setItem(row, 1, new QTableWidgetItem(text));
          }

          formatsTable->resizeColumnToContents(0);
      }