/****************************************************************************

**

** All rights reserved.

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

**

** This file is part of the QtCore module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

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

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

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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

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

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

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

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

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

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

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

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

**

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

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qmimedata.h"

#include "private/qobject_p.h"

#include "qurl.h"

#include "qstringlist.h"

#include "qtextcodec.h"

QT_BEGIN_NAMESPACE

struct QMimeDataStruct

{

    QString format;

    QVariant data;

};

class QMimeDataPrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QMimeData)

public:

    void removeData(const QString &format);

    void setData(const QString &format, const QVariant &data);

    QVariant getData(const QString &format) const;

    QVariant retrieveTypedData(const QString &format, QVariant::Type type) const;

    QList<QMimeDataStruct> dataList;

};

void QMimeDataPrivate::removeData(const QString &format)

{

    for (int i=0; i<dataList.size(); i++) {

        if (dataList.at(i).format == format) {

            dataList.removeAt(i);

            return;

        }

    }

}

void QMimeDataPrivate::setData(const QString &format, const QVariant &data)

{

    // remove it first if the format is already here.

    removeData(format);

    QMimeDataStruct mimeData;

    mimeData.format = format;

    mimeData.data = data;

    dataList += mimeData;

}

QVariant QMimeDataPrivate::getData(const QString &format) const

{

    QVariant data;

    for (int i=0; i<dataList.size(); i++) {

        if (dataList.at(i).format == format) {

            data = dataList.at(i).data;

            break;

        }

    }

    return data;

}

QVariant QMimeDataPrivate::retrieveTypedData(const QString &format, QVariant::Type type) const

{

    Q_Q(const QMimeData);

    QVariant data = q->retrieveData(format, type);

    if (data.type() == type || !data.isValid())

        return data;

    // provide more conversion possiblities than just what QVariant provides

    // URLs can be lists as well...

    if ((type == QVariant::Url && data.type() == QVariant::List)

        || (type == QVariant::List && data.type() == QVariant::Url))

        return data;

    // images and pixmaps are interchangeable

    if ((type == QVariant::Pixmap && data.type() == QVariant::Image)

        || (type == QVariant::Image && data.type() == QVariant::Pixmap))

        return data;

    if (data.type() == QVariant::ByteArray) {

        // see if we can convert to the requested type

        switch(type) {

#ifndef QT_NO_TEXTCODEC

        case QVariant::String: {

            const QByteArray ba = data.toByteArray();

            QTextCodec *codec = QTextCodec::codecForName("utf-8");

            if (format == QLatin1String("text/html"))

                codec = QTextCodec::codecForHtml(ba, codec);

            return codec->toUnicode(ba);

        }

#endif // QT_NO_TEXTCODEC

        case QVariant::Color: {

            QVariant newData = data;

            newData.convert(QVariant::Color);

            return newData;

        }

        case QVariant::List: {

            if (format != QLatin1String("text/uri-list"))

                break;

            // fall through

        }

        case QVariant::Url: {

            QByteArray ba = data.toByteArray();

            // Qt 3.x will send text/uri-list with a trailing

            // null-terminator (that is *not* sent for any other

            // text/* mime-type), so chop it off

            if (ba.endsWith('\0'))

                ba.chop(1);

            QList<QByteArray> urls = ba.split('\n');

            QList<QVariant> list;

            for (int i = 0; i < urls.size(); ++i) {

                QByteArray ba = urls.at(i).trimmed();

                if (!ba.isEmpty())

                    list.append(QUrl::fromEncoded(ba));

            }

            return list;

        }

        default:

            break;

        }

    } else if (type == QVariant::ByteArray) {

        // try to convert to bytearray

        switch(data.type()) {

        case QVariant::ByteArray:

        case QVariant::Color:

            return data.toByteArray();

            break;

        case QVariant::String:

            return data.toString().toUtf8();

            break;

        case QVariant::Url:

            return data.toUrl().toEncoded();

            break;

        case QVariant::List: {

            // has to be list of URLs

            QByteArray result;

            QList<QVariant> list = data.toList();

            for (int i = 0; i < list.size(); ++i) {

                if (list.at(i).type() == QVariant::Url) {

                    result += list.at(i).toUrl().toEncoded();

                    result += "\r\n";

                }

            }

            if (!result.isEmpty())

                return result;

            break;

        }

        default:

            break;

        }

    }

    return data;

}

/*!

    \class QMimeData

    \brief The QMimeData class provides a container for data that records information

    about its MIME type.

    QMimeData is used to describe information that can be stored in

    the \l{QClipboard}{clipboard}, and transferred via the \l{drag

    and drop} mechanism. QMimeData objects associate the data that

    they hold with the corresponding MIME types to ensure that

    information can be safely transferred between applications, and

    copied around within the same application.

    QMimeData objects are usually created using \c new and supplied

    to QDrag or QClipboard objects. This is to enable Qt to manage

    the memory that they use.

    A single QMimeData object can store the same data using several

    different formats at the same time. The formats() function

    returns a list of the available formats in order of preference.

    The data() function returns the raw data associated with a MIME

    type, and setData() allows you to set the data for a MIME type.

    For the most common MIME types, QMimeData provides convenience

    functions to access the data:

    \table

    \header \o Tester       \o Getter       \o Setter           \o MIME Types

    \row    \o hasText()    \o text()       \o setText()        \o \c text/plain

    \row    \o hasHtml()    \o html()       \o setHtml()        \o \c text/html

    \row    \o hasUrls()    \o urls()       \o setUrls()        \o \c text/uri-list

    \row    \o hasImage()   \o imageData()  \o setImageData()   \o \c image/ *

    \row    \o hasColor()   \o colorData()  \o setColorData()   \o \c application/x-color

    \endtable

    For example, if your write a widget that accepts URL drags, you

    would end up writing code like this:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmimedata.cpp 0

    There are three approaches for storing custom data in a QMimeData

    object:

    \list 1

    \o  Custom data can be stored directly in a QMimeData object as a

        QByteArray using setData(). For example:

        \snippet doc/src/snippets/code/src_corelib_kernel_qmimedata.cpp 1

    \o  We can subclass QMimeData and reimplement hasFormat(),

        formats(), and retrieveData().

    \o  If the drag and drop operation occurs withing a single

        application, we can subclass QMimeData and add extra data in

        it, and use a qobject_cast() in the receiver's drop event

        handler. For example:

        \snippet doc/src/snippets/code/src_corelib_kernel_qmimedata.cpp 2

    \endlist

    \section1 Platform-Specific MIME Types

    On Windows, formats() will also return custom formats available

    in the MIME data, using the \c{x-qt-windows-mime} subtype to

    indicate that they represent data in non-standard formats.

    The formats will take the following form:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmimedata.cpp 3

    The following are examples of custom MIME types:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmimedata.cpp 4

    The \c value declaration of each format describes the way in which the

    data is encoded.

    On Windows, the MIME format does not always map directly to the

    clipboard formats. Qt provides QWindowsMime to map clipboard

    formats to open-standard MIME formats. Similarly, the

    QMacPasteboardMime maps MIME to Mac flavors.

    \sa QClipboard, QDragEnterEvent, QDragMoveEvent, QDropEvent, QDrag,

        QWindowsMime, QMacPasteboardMime, {Drag and Drop}

*/

/*!

    Constructs a new MIME data object with no data in it.

*/

QMimeData::QMimeData()

    : QObject(*new QMimeDataPrivate, 0)

{

}

/*!

    Destroys the MIME data object.

*/

QMimeData::~QMimeData()

{

}

/*!

    Returns a list of URLs contained within the MIME data object.

    URLs correspond to the MIME type \c text/uri-list.

    \sa hasUrls(), data()

*/

QList<QUrl> QMimeData::urls() const

{

    Q_D(const QMimeData);

    QVariant data = d->retrieveTypedData(QLatin1String("text/uri-list"), QVariant::List);

    QList<QUrl> urls;

    if (data.type() == QVariant::Url)

        urls.append(data.toUrl());

    else if (data.type() == QVariant::List) {

        QList<QVariant> list = data.toList();

        for (int i = 0; i < list.size(); ++i) {

            if (list.at(i).type() == QVariant::Url)

                urls.append(list.at(i).toUrl());

        }

    }

    return urls;

}

/*!

    Sets the URLs stored in the MIME data object to those specified by \a urls.

    URLs correspond to the MIME type \c text/uri-list.

    \sa hasUrls(), setData()

*/

void QMimeData::setUrls(const QList<QUrl> &urls)

{

    Q_D(QMimeData);

    QList<QVariant> list;

    for (int i = 0; i < urls.size(); ++i)

        list.append(urls.at(i));

    d->setData(QLatin1String("text/uri-list"), list);

}

/*!

    Returns true if the object can return a list of urls; otherwise

    returns false.

    URLs correspond to the MIME type \c text/uri-list.

    \sa setUrls(), urls(), hasFormat()

*/

bool QMimeData::hasUrls() const

{

    return hasFormat(QLatin1String("text/uri-list"));

}

/*!

    Returns a plain text (MIME type \c text/plain) representation of

    the data.

    \sa hasText(), html(), data()

*/

QString QMimeData::text() const

{

    Q_D(const QMimeData);

    QVariant data = d->retrieveTypedData(QLatin1String("text/plain"), QVariant::String);

    return data.toString();

}

/*!

    Sets \a text as the plain text (MIME type \c text/plain) used to

    represent the data.

    \sa hasText(), setHtml(), setData()

*/

void QMimeData::setText(const QString &text)

{

    Q_D(QMimeData);

    d->setData(QLatin1String("text/plain"), text);

}

/*!

    Returns true if the object can return plain text (MIME type \c

    text/plain); otherwise returns false.

    \sa setText(), text(), hasHtml(), hasFormat()

*/

bool QMimeData::hasText() const

{

    return hasFormat(QLatin1String("text/plain"));

}

/*!

    Returns a string if the data stored in the object is HTML (MIME

    type \c text/html); otherwise returns an empty string.

    \sa hasHtml(), setData()

*/

QString QMimeData::html() const

{

    Q_D(const QMimeData);

    QVariant data = d->retrieveTypedData(QLatin1String("text/html"), QVariant::String);

    return data.toString();

}

/*!

    Sets \a html as the HTML (MIME type \c text/html) used to

    represent the data.

    \sa hasHtml(), setText(), setData()

*/

void QMimeData::setHtml(const QString &html)

{

    Q_D(QMimeData);

    d->setData(QLatin1String("text/html"), html);

}

/*!

    Returns true if the object can return HTML (MIME type \c

    text/html); otherwise returns false.

    \sa setHtml(), html(), hasFormat()

*/

bool QMimeData::hasHtml() const

{

    return hasFormat(QLatin1String("text/html"));

}

/*!

    Returns a QVariant storing a QImage if the object can return an

    image; otherwise returns a null variant.

    A QVariant is used because QMimeData belongs to the \l QtCore

    library, whereas QImage belongs to \l QtGui. To convert the

    QVariant to a QImage, simply use qvariant_cast(). For example:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmimedata.cpp 5

    \sa hasImage()

*/

QVariant QMimeData::imageData() const

{

    Q_D(const QMimeData);

    return d->retrieveTypedData(QLatin1String("application/x-qt-image"), QVariant::Image);

}

/*!

    Sets the data in the object to the given \a image.

    A QVariant is used because QMimeData belongs to the \l QtCore

    library, whereas QImage belongs to \l QtGui. The conversion

    from QImage to QVariant is implicit. For example:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmimedata.cpp 6

    \sa hasImage(), setData()

*/

void QMimeData::setImageData(const QVariant &image)

{

    Q_D(QMimeData);

    d->setData(QLatin1String("application/x-qt-image"), image);

}

/*!

    Returns true if the object can return an image; otherwise returns

    false.

    \sa setImageData(), imageData(), hasFormat()

*/

bool QMimeData::hasImage() const

{

    return hasFormat(QLatin1String("application/x-qt-image"));

}

/*!

    Returns a color if the data stored in the object represents a

    color (MIME type \c application/x-color); otherwise returns a

    null variant.

    A QVariant is used because QMimeData belongs to the \l QtCore

    library, whereas QColor belongs to \l QtGui. To convert the

    QVariant to a QColor, simply use qvariant_cast(). For example:

    \snippet doc/src/snippets/code/src_corelib_kernel_qmimedata.cpp 7

    \sa hasColor(), setColorData(), data()

*/

QVariant QMimeData::colorData() const

{

    Q_D(const QMimeData);

    return d->retrieveTypedData(QLatin1String("application/x-color"), QVariant::Color);

}

/*!

    Sets the color data in the object to the given \a color.

    Colors correspond to the MIME type \c application/x-color.

    \sa hasColor(), setData()

*/

void QMimeData::setColorData(const QVariant &color)

{

    Q_D(QMimeData);

    d->setData(QLatin1String("application/x-color"), color);

}

/*!

    Returns true if the object can return a color (MIME type \c

    application/x-color); otherwise returns false.

    \sa setColorData(), colorData(), hasFormat()

*/

bool QMimeData::hasColor() const

{

    return hasFormat(QLatin1String("application/x-color"));

}

/*!

    Returns the data stored in the object in the format described by

    the MIME type specified by \a mimeType.

*/

QByteArray QMimeData::data(const QString &mimeType) const

{

    Q_D(const QMimeData);

    QVariant data = d->retrieveTypedData(mimeType, QVariant::ByteArray);

    return data.toByteArray();

}

/*!