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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 documentation 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 /*

    43 finalwidget.cpp

    44 

    45 A widget to display an image and a label containing a description.

    46 */

    47 

    48 #include <QtGui>

    49 #include "finalwidget.h"

    50 

    51 FinalWidget::FinalWidget(QWidget *parent, const QString &name,

    52                          const QSize &labelSize)

    53     : QFrame(parent)

    54 {

    55     hasImage = false;

    56     imageLabel = new QLabel;

    57     imageLabel->setFrameShadow(QFrame::Sunken);

    58     imageLabel->setFrameShape(QFrame::StyledPanel);

    59     imageLabel->setMinimumSize(labelSize);

    60     nameLabel = new QLabel(name);

    61 

    62     QVBoxLayout *layout = new QVBoxLayout;

    63     layout->addWidget(imageLabel, 1);

    64     layout->addWidget(nameLabel, 0);

    65     setLayout(layout);

    66 }

    67 

    68 /*!

    69     If the mouse moves far enough when the left mouse button is held down,

    70     start a drag and drop operation.

    71 */

    72 

    73 void FinalWidget::mouseMoveEvent(QMouseEvent *event)

    74 {

    75     if (!(event->buttons() & Qt::LeftButton))

    76         return;

    77     if ((event->pos() - dragStartPosition).manhattanLength()

    78          < QApplication::startDragDistance())

    79         return;

    80     if (!hasImage)

    81         return;

    82 

    83     QDrag *drag = new QDrag(this);

    84     QMimeData *mimeData = new QMimeData;

    85 

    86 //! [0]

    87     QByteArray output;

    88     QBuffer outputBuffer(&output);

    89     outputBuffer.open(QIODevice::WriteOnly);

    90     imageLabel->pixmap()->toImage().save(&outputBuffer, "PNG");

    91     mimeData->setData("image/png", output);

    92 //! [0]

    93 /*

    94 //! [1]

    95     mimeData->setImageData(QVariant(*imageLabel->pixmap()));

    96 //! [1]

    97 */

    98     drag->setMimeData(mimeData);

    99     drag->setPixmap(imageLabel->pixmap()->scaled(64, 64, Qt::KeepAspectRatio));

   100 //! [2]

   101     drag->setHotSpot(QPoint(drag->pixmap().width()/2,

   102                             drag->pixmap().height()));

   103 //! [2]

   104 

   105     drag->start();

   106 }

   107 

   108 /*!

   109     Check for left mouse button presses in order to enable drag and drop.

   110 */

   111 

   112 void FinalWidget::mousePressEvent(QMouseEvent *event)

   113 {

   114     if (event->button() == Qt::LeftButton)

   115         dragStartPosition = event->pos();

   116 }

   117 

   118 const QPixmap* FinalWidget::pixmap() const

   119 {

   120     return imageLabel->pixmap();

   121 }

   122 

   123 void FinalWidget::setPixmap(const QPixmap &pixmap)

   124 {

   125     imageLabel->setPixmap(pixmap);

   126     hasImage = true;

   127 }