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#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();
}
/*!
Sets the data associated with the MIME type given by \a mimeType
to the specified \a data.
For the most common types of data, you can call the higher-level
functions setText(), setHtml(), setUrls(), setImageData(), and
setColorData() instead.
Note that if you want to use a custom data type in an item view drag and drop
operation, you must register it as a Qt \l{QMetaType}{meta type}, using the
Q_DECLARE_METATYPE() macro, and implement stream operators for it. The stream
operators must then be registered with the qRegisterMetaTypeStreamOperators()
function.
\sa hasFormat(), QMetaType, qRegisterMetaTypeStreamOperators()
*/
void QMimeData::setData(const QString &mimeType, const QByteArray &data)
{
Q_D(QMimeData);
d->setData(mimeType, QVariant(data));
}
/*!
Returns true if the object can return data for the MIME type
specified by \a mimeType; otherwise returns false.
For the most common types of data, you can call the higher-level
functions hasText(), hasHtml(), hasUrls(), hasImage(), and
hasColor() instead.
\sa formats(), setData(), data()
*/
bool QMimeData::hasFormat(const QString &mimeType) const
{
return formats().contains(mimeType);
}
/*!
Returns a list of formats supported by the object. This is a list
of MIME types for which the object can return suitable data. The
formats in the list are in a priority order.
For the most common types of data, you can call the higher-level
functions hasText(), hasHtml(), hasUrls(), hasImage(), and
hasColor() instead.
\sa hasFormat(), setData(), data()
*/
QStringList QMimeData::formats() const
{
Q_D(const QMimeData);
QStringList list;
for (int i=0; i<d->dataList.size(); i++)
list += d->dataList.at(i).format;
return list;
}
/*!
Returns a variant with the given \a type containing data for the
MIME type specified by \a mimeType. If the object does not
support the MIME type or variant type given, a null variant is
returned instead.
This function is called by the general data() getter and by the
convenience getters (text(), html(), urls(), imageData(), and
colorData()). You can reimplement it if you want to store your
data using a custom data structure (instead of a QByteArray,
which is what setData() provides). You would then also need
to reimplement hasFormat() and formats().
\sa data()
*/
QVariant QMimeData::retrieveData(const QString &mimeType, QVariant::Type type) const
{
Q_UNUSED(type);
Q_D(const QMimeData);
return d->getData(mimeType);
}
/*!
Removes all the MIME type and data entries in the object.
*/
void QMimeData::clear()
{
Q_D(QMimeData);
d->dataList.clear();
}
/*!
\since 4.4
Removes the data entry for \a mimeType in the object.
*/
void QMimeData::removeFormat(const QString &mimeType)
{
Q_D(QMimeData);
d->removeData(mimeType);
}
QT_END_NAMESPACE