|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# dragwidget.cpp Example File
draganddrop/draggabletext/dragwidget.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of
     ** this file.  Please review the following information to ensure GNU
     ** General Public Licensing requirements will be met:
     ** http://trolltech.com/products/qt/licenses/licensing/opensource/
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
     ** or contact the sales department at sales@trolltech.com.
     **
     ** In addition, as a special exception, Trolltech gives you certain
     ** additional rights. These rights are described in the Trolltech GPL
     ** Exception version 1.0, which can be found at
     ** http://www.trolltech.com/products/qt/gplexception/ and in the file
     ** GPL_EXCEPTION.txt in this package.
     **
     ** In addition, as a special exception, Trolltech, as the sole copyright
     ** holder for Qt Designer, grants users of the Qt/Eclipse Integration
     ** plug-in the right for the Qt/Eclipse Integration to link to
     ** functionality provided by Qt Designer and its related libraries.
     **
     ** Trolltech reserves all rights not expressly granted herein.
     **
     ** Trolltech ASA (c) 2007
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #include <QtGui>

     #include "draglabel.h"
     #include "dragwidget.h"

     DragWidget::DragWidget(QWidget *parent)
         : QWidget(parent)
     {
         QFile dictionaryFile(":/dictionary/words.txt");
         dictionaryFile.open(QIODevice::ReadOnly);
         QTextStream inputStream(&dictionaryFile);

         int x = 5;
         int y = 5;

         while (!inputStream.atEnd()) {
             QString word;
             inputStream >> word;
             if (!word.isEmpty()) {
                 DragLabel *wordLabel = new DragLabel(word, this);
                 wordLabel->move(x, y);
                 wordLabel->show();
                 x += wordLabel->width() + 2;
                 if (x >= 195) {
                     x = 5;
                     y += wordLabel->height() + 2;
                 }
             }
         }

         QPalette newPalette = palette();
         newPalette.setColor(QPalette::Window, Qt::white);
         setPalette(newPalette);

         setAcceptDrops(true);
         setMinimumSize(400, qMax(200, y));
         setWindowTitle(tr("Draggable Text"));
     }

     void DragWidget::dragEnterEvent(QDragEnterEvent *event)
     {
         if (event->mimeData()->hasText()) {
             if (children().contains(event->source())) {
                 event->setDropAction(Qt::MoveAction);
                 event->accept();
             } else {
                 event->acceptProposedAction();
             }
         } else {
             event->ignore();
         }
     }

     void DragWidget::dropEvent(QDropEvent *event)
     {
         if (event->mimeData()->hasText()) {
             const QMimeData *mime = event->mimeData();
             QStringList pieces = mime->text().split(QRegExp("\\s+"),
                                  QString::SkipEmptyParts);
             QPoint position = event->pos();
             QPoint hotSpot;

             QList<QByteArray> hotSpotPos = mime->data("application/x-hotspot").split(' ');
             if (hotSpotPos.size() == 2) {
                 hotSpot.setX(hotSpotPos.first().toInt());
                 hotSpot.setY(hotSpotPos.last().toInt());
             }

             foreach (QString piece, pieces) {
                 DragLabel *newLabel = new DragLabel(piece, this);
                 newLabel->move(position - hotSpot);
                 newLabel->show();

                 position += QPoint(newLabel->width(), 0);
             }

             if (children().contains(event->source())) {
                 event->setDropAction(Qt::MoveAction);
                 event->accept();
             } else {
                 event->acceptProposedAction();
             }
         } else {
             event->ignore();
         }
     }