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     2 **

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

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

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

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

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    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

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    28 ** If you have questions regarding the use of this file, please contact

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    36 **

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    38 ** $QT_END_LICENSE$

    39 **

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

    41 

    42 #include <QtGui>

    43 

    44 #include "droparea.h"

    45 

    46 DropArea::DropArea(QWidget *parent)

    47     : QLabel(parent)

    48 {

    49     setMinimumSize(200, 200);

    50     setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);

    51     setAlignment(Qt::AlignCenter);

    52     setAcceptDrops(true);

    53     setAutoFillBackground(true);

    54     clear();

    55 }

    56 

    57 void DropArea::dragEnterEvent(QDragEnterEvent *event)

    58 {

    59     setText(tr("<drop content>"));

    60     setBackgroundRole(QPalette::Highlight);

    61 

    62     event->acceptProposedAction();

    63     emit changed(event->mimeData());

    64 }

    65 

    66 void DropArea::dragMoveEvent(QDragMoveEvent *event)

    67 {

    68     event->acceptProposedAction();

    69 }

    70 

    71 void DropArea::dropEvent(QDropEvent *event)

    72 {

    73     const QMimeData *mimeData = event->mimeData();

    74 

    75     if (mimeData->hasImage()) {

    76         setPixmap(qvariant_cast<QPixmap>(mimeData->imageData()));

    77     } else if (mimeData->hasHtml()) {

    78         setText(mimeData->html());

    79         setTextFormat(Qt::RichText);

    80     } else if (mimeData->hasText()) {

    81         setText(mimeData->text());

    82         setTextFormat(Qt::PlainText);

    83     } else {

    84         setText(tr("Cannot display data"));

    85     }

    86 

    87     setBackgroundRole(QPalette::Dark);

    88     event->acceptProposedAction();

    89 }

    90 

    91 //![0]

    92 void DropArea::paste()

    93 {

    94     const QClipboard *clipboard = QApplication::clipboard();

    95     const QMimeData *mimeData = clipboard->mimeData();

    96 

    97     if (mimeData->hasImage()) {

    98         setPixmap(qvariant_cast<QPixmap>(mimeData->imageData()));

    99     } else if (mimeData->hasHtml()) {

   100         setText(mimeData->html());

   101         setTextFormat(Qt::RichText);

   102     } else if (mimeData->hasText()) {

   103         setText(mimeData->text());

   104         setTextFormat(Qt::PlainText);

   105     } else {

   106         setText(tr("Cannot display data"));

   107     }

   108 //![0]

   109 

   110     emit changed(mimeData);

   111     setBackgroundRole(QPalette::Dark);

   112     //event->acceptProposedAction();

   113 }

   114 

   115 void DropArea::dragLeaveEvent(QDragLeaveEvent *event)

   116 {

   117     clear();

   118     event->accept();

   119 }

   120 

   121 void DropArea::clear()

   122 {

   123     setText(tr("<drop content>"));

   124     setBackgroundRole(QPalette::Dark);

   125 

   126     emit changed();

   127 }

   128 

   129 QPixmap DropArea::extractPixmap(const QByteArray &data, const QString &format)

   130 {

   131     QList<QByteArray> imageFormats = QImageReader::supportedImageFormats();

   132     QPixmap pixmap;

   133 

   134     foreach (QByteArray imageFormat, imageFormats) {

   135         if (format.mid(6) == QString(imageFormat)) {

   136             pixmap.loadFromData(data, imageFormat);

   137             break;

   138         }

   139     }

   140     return pixmap;

   141 }