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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the examples of the Qt Toolkit.

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    16 ** GNU Lesser General Public License Usage

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 

    44 #include "draglabel.h"

    45 #include "dragwidget.h"

    46 

    47 DragWidget::DragWidget(QWidget *parent)

    48     : QWidget(parent)

    49 {

    50     QFile dictionaryFile(":/dictionary/words.txt");

    51     dictionaryFile.open(QIODevice::ReadOnly);

    52     QTextStream inputStream(&dictionaryFile);

    53 

    54     int x = 5;

    55     int y = 5;

    56 

    57     while (!inputStream.atEnd()) {

    58         QString word;

    59         inputStream >> word;

    60         if (!word.isEmpty()) {

    61             DragLabel *wordLabel = new DragLabel(word, this);

    62             wordLabel->move(x, y);

    63             wordLabel->show();

    64             wordLabel->setAttribute(Qt::WA_DeleteOnClose);

    65             x += wordLabel->width() + 2;

    66             if (x >= 195) {

    67                 x = 5;

    68                 y += wordLabel->height() + 2;

    69             }

    70         }

    71     }

    72 

    73     QPalette newPalette = palette();

    74     newPalette.setColor(QPalette::Window, Qt::white);

    75     setPalette(newPalette);

    76 

    77     setAcceptDrops(true);

    78     setMinimumSize(400, qMax(200, y));

    79     setWindowTitle(tr("Draggable Text"));

    80 }

    81 

    82 void DragWidget::dragEnterEvent(QDragEnterEvent *event)

    83 {

    84     if (event->mimeData()->hasText()) {

    85         if (children().contains(event->source())) {

    86             event->setDropAction(Qt::MoveAction);

    87             event->accept();

    88         } else {

    89             event->acceptProposedAction();

    90         }

    91     } else {

    92         event->ignore();

    93     }

    94 }

    95 

    96 void DragWidget::dropEvent(QDropEvent *event)

    97 {

    98     if (event->mimeData()->hasText()) {

    99         const QMimeData *mime = event->mimeData();

   100         QStringList pieces = mime->text().split(QRegExp("\\s+"),

   101                              QString::SkipEmptyParts);

   102         QPoint position = event->pos();

   103         QPoint hotSpot;

   104 

   105         QList<QByteArray> hotSpotPos = mime->data("application/x-hotspot").split(' ');

   106         if (hotSpotPos.size() == 2) {

   107             hotSpot.setX(hotSpotPos.first().toInt());

   108             hotSpot.setY(hotSpotPos.last().toInt());

   109         }

   110 

   111         foreach (QString piece, pieces) {

   112             DragLabel *newLabel = new DragLabel(piece, this);

   113             newLabel->move(position - hotSpot);

   114             newLabel->show();

   115             newLabel->setAttribute(Qt::WA_DeleteOnClose);

   116 

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

   118         }

   119 

   120         if (event->source() == this) {

   121             event->setDropAction(Qt::MoveAction);

   122             event->accept();

   123         } else {

   124             event->acceptProposedAction();

   125         }

   126     } else {

   127         event->ignore();

   128     }

   129     foreach (QObject *child, children()) {

   130         if (child->inherits("QWidget")) {

   131             QWidget *widget = static_cast<QWidget *>(child);

   132             if (!widget->isVisible())

   133                 widget->deleteLater();

   134         }

   135     }

   136 }

   137 

   138 void DragWidget::mousePressEvent(QMouseEvent *event)

   139 {

   140     QLabel *child = static_cast<QLabel*>(childAt(event->pos()));

   141     if (!child)

   142         return;

   143 

   144     QPoint hotSpot = event->pos() - child->pos();

   145 

   146     QMimeData *mimeData = new QMimeData;

   147     mimeData->setText(child->text());

   148     mimeData->setData("application/x-hotspot",

   149                       QByteArray::number(hotSpot.x())

   150                       + " " + QByteArray::number(hotSpot.y()));

   151 

   152     QPixmap pixmap(child->size());

   153     child->render(&pixmap);

   154 

   155     QDrag *drag = new QDrag(this);

   156     drag->setMimeData(mimeData);

   157     drag->setPixmap(pixmap);

   158     drag->setHotSpot(hotSpot);

   159 

   160     Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);

   161 

   162     if (dropAction == Qt::MoveAction)

   163         child->close();

   164 }