qt5base-lts/examples/draganddrop/dropsite/dropsitewindow.cpp

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#include <QtWidgets>

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

//! [constructor part1]
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();
//! [constructor part1]

//! [constructor part2]
    dropArea = new DropArea;
    connect(dropArea, SIGNAL(changed(const QMimeData*)),
            this, SLOT(updateFormatsTable(const QMimeData*)));
//! [constructor part2]

//! [constructor part3]
    QStringList labels;
    labels << tr("Format") << tr("Content");

    formatsTable = new QTableWidget;
    formatsTable->setColumnCount(2);
    formatsTable->setEditTriggers(QAbstractItemView::NoEditTriggers);
    formatsTable->setHorizontalHeaderLabels(labels);
    formatsTable->horizontalHeader()->setStretchLastSection(true);
//! [constructor part3]

//! [constructor part4]
    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, SIGNAL(pressed()), this, SLOT(close()));
    connect(clearButton, SIGNAL(pressed()), dropArea, SLOT(clear()));
//! [constructor part4]

//! [constructor part5]
    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addWidget(abstractLabel);
    mainLayout->addWidget(dropArea);
    mainLayout->addWidget(formatsTable);
    mainLayout->addWidget(buttonBox);
    setLayout(mainLayout);

    setWindowTitle(tr("Drop Site"));
    setMinimumSize(350, 500);
}
//! [constructor part5]

//! [updateFormatsTable() part1]
void DropSiteWindow::updateFormatsTable(const QMimeData *mimeData)
{
    formatsTable->setRowCount(0);
    if (!mimeData)
        return;
//! [updateFormatsTable() part1]

//! [updateFormatsTable() part2]        
    foreach (QString format, mimeData->formats()) {
        QTableWidgetItem *formatItem = new QTableWidgetItem(format);
        formatItem->setFlags(Qt::ItemIsEnabled);
        formatItem->setTextAlignment(Qt::AlignTop | Qt::AlignLeft);
//! [updateFormatsTable() part2]

//! [updateFormatsTable() part3]
        QString text;
        if (format == "text/plain") {
            text = mimeData->text().simplified();
        } else if (format == "text/html") {
            text = mimeData->html().simplified();
        } else if (format == "text/uri-list") {
            QList<QUrl> urlList = mimeData->urls();
            for (int i = 0; i < urlList.size() && i < 32; ++i)
                text.append(urlList[i].toString() + " ");
        } else {
            QByteArray data = mimeData->data(format);
            for (int i = 0; i < data.size() && i < 32; ++i) {
                QString hex = QString("%1").arg(uchar(data[i]), 2, 16,
                                                QChar('0'))
                                           .toUpper();
                text.append(hex + " ");
            }
        }
//! [updateFormatsTable() part3]   

//! [updateFormatsTable() part4]
        int row = formatsTable->rowCount();
        formatsTable->insertRow(row);
        formatsTable->setItem(row, 0, new QTableWidgetItem(format));
        formatsTable->setItem(row, 1, new QTableWidgetItem(text));
    }
    
    formatsTable->resizeColumnToContents(0);
}
//! [updateFormatsTable() part4]