- Qt 5.5
- Qt Widgets
- Drop Site Example
- dropsitewindow.cpp Example File
- Qt 5.5.1 Reference Documentation

# dropsitewindow.cpp Example File

draganddrop/dropsite/dropsitewindow.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
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    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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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, SIGNAL(changed(const QMimeData*)),
                this, SLOT(updateFormatsTable(const QMimeData*)));

        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, SIGNAL(pressed()), this, SLOT(close()));
        connect(clearButton, SIGNAL(pressed()), dropArea, SLOT(clear()));

        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);
    }

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

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

            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 + " ");
                }
            }

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

        formatsTable->resizeColumnToContents(0);
    }