Qt 4.8: dropsitewindow.cpp Example File (draganddrop/dropsite/dropsitewindow.cpp)

Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# 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
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include <QtGui>

     #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);
     }