\inmodule QtCore More...

#include <qmimedata.h>

Inheritance diagram for QMimeData:

Collaboration diagram for QMimeData:

Public Member Functions
	QMimeData ()
	Constructs a new MIME data object with no data in it.

	~QMimeData ()
	Destroys the MIME data object.

QList< QUrl >	urls () const
	Returns a list of URLs contained within the MIME data object.

void	setUrls (const QList< QUrl > &urls)
	Sets the URLs stored in the MIME data object to those specified by urls.

bool	hasUrls () const
	Returns `true` if the object can return a list of urls; otherwise returns `false`.

QString	text () const
	Returns a plain text (MIME type `text/plain`) representation of the data.

void	setText (const QString &text)
	Sets text as the plain text (MIME type `text/plain`) used to represent the data.

bool	hasText () const
	Returns `true` if the object can return plain text (MIME type `text/plain`); otherwise returns `false`.

QString	html () const
	Returns a string if the data stored in the object is HTML (MIME type `text/html`); otherwise returns an empty string.

void	setHtml (const QString &html)
	Sets html as the HTML (MIME type `text/html`) used to represent the data.

bool	hasHtml () const
	Returns `true` if the object can return HTML (MIME type `text/html`); otherwise returns `false`.

QVariant	imageData () const
	Returns a QVariant storing a QImage if the object can return an image; otherwise returns a null variant.

void	setImageData (const QVariant &image)
	Sets the data in the object to the given image.

bool	hasImage () const
	Returns `true` if the object can return an image; otherwise returns false.

QVariant	colorData () const
	Returns a color if the data stored in the object represents a color (MIME type `application/x-color`); otherwise returns a null variant.

void	setColorData (const QVariant &color)
	Sets the color data in the object to the given color.

bool	hasColor () const
	Returns `true` if the object can return a color (MIME type `application/x-color`); otherwise returns `false`.

QByteArray	data (const QString &mimetype) const
	Returns the data stored in the object in the format described by the MIME type specified by mimeType.

void	setData (const QString &mimetype, const QByteArray &data)
	Sets the data associated with the MIME type given by mimeType to the specified data.

void	removeFormat (const QString &mimetype)

virtual bool	hasFormat (const QString &mimetype) const
	Returns `true` if the object can return data for the MIME type specified by mimeType; otherwise returns `false`.

virtual QStringList	formats () const
	Returns a list of formats supported by the object.

void	clear ()
	Removes all the MIME type and data entries in the object.

Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.

virtual	~QObject ()
	Destroys the object, deleting all its child objects.

virtual bool	event (QEvent *event)
	This virtual function receives events to an object and should return true if the event e was recognized and processed.

virtual bool	eventFilter (QObject watched, QEvent event)
	Filters events if this object has been installed as an event filter for the watched object.

QString	objectName () const

Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.

void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QBindable< QString >	bindableObjectName ()

bool	isWidgetType () const
	Returns `true` if the object is a widget; otherwise returns `false`.

bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.

bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.

bool	signalsBlocked () const noexcept
	Returns `true` if signals are blocked; otherwise returns `false`.

bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).

QThread *	thread () const
	Returns the thread in which the object lives.

bool	moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
	Changes the thread affinity for this object and its children and returns `true` on success.

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.

int	startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)

void	killTimer (int id)
	Kills the timer with timer identifier, id.

void	killTimer (Qt::TimerId id)

template<typename T >
T	findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.

template<typename T >
QList< T >	findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.

template<typename T >
T	findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

const QObjectList &	children () const
	Returns a list of child objects.

void	setParent (QObject *parent)
	Makes the object a child of parent.

void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.

void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=nullptr, const QObject receiver=nullptr, const char *member=nullptr) const

bool	disconnect (const QObject receiver, const char member=nullptr) const

void	dumpObjectTree () const
	Dumps a tree of children to the debug output.

void	dumpObjectInfo () const
	Dumps information about signal connections, etc.

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.

bool	setProperty (const char *name, QVariant &&value)

QVariant	property (const char *name) const
	Returns the value of the object's name property.

QList< QByteArray >	dynamicPropertyNames () const

QBindingStorage *	bindingStorage ()

const QBindingStorage *	bindingStorage () const

QObject *	parent () const
	Returns a pointer to the parent object.

bool	inherits (const char *classname) const
	Returns `true` if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns `false`.

Protected Member Functions
virtual QVariant	retrieveData (const QString &mimetype, QMetaType preferredType) const
	Returns a variant with the given type containing data for the MIME type specified by mimeType.

Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.

int	senderSignalIndex () const

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.

bool	isSignalConnected (const QMetaMethod &signal) const

virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.

virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.

virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

	QObject (QObjectPrivate &dd, QObject *parent=nullptr)

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.

void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.

Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe

static QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.

template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)

template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)

Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Properties inherited from QObject
QString	objectName
	the name of this object

Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.

template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

\inmodule QtCore

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 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

Tester
Getter
Setter
MIME Types \row
hasText()
text()
setText()
text/plain \row
hasHtml()
html()
setHtml()
text/html \row
hasUrls()
urls()
setUrls()
text/uri-list \row
hasImage()
imageData()
setImageData()
image/ * \row
hasColor()
colorData()
setColorData()
application/x-color \endtable

For example, if your write a widget that accepts URL drags, you would end up writing code like this:

void MyWidget::dragEnterEvent(QDragEnterEvent *event)
{
    if (event->mimeData()->hasUrls())
        event->acceptProposedAction();
}
 
void MyWidget::dropEvent(QDropEvent *event)
{
    if (event->mimeData()->hasUrls()) {
        foreach (QUrl url, event->mimeData()->urls()) {
            ...
        }
    }
}

There are three approaches for storing custom data in a QMimeData object:

\list 1

Custom data can be stored directly in a QMimeData object as a QByteArray using setData(). For example:

QByteArray csvData = ...;
 
QMimeData *mimeData = new QMimeData;
mimeData->setData("text/csv", csvData);

We can subclass QMimeData and reimplement hasFormat(), formats(), and retrieveData().

If the drag and drop operation occurs within 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:

void MyWidget::dropEvent(QDropEvent *event)
{
    const MyMimeData *myData =
            qobject_cast<const MyMimeData *>(event->mimeData());
    if (myData) {
        // access myData's data directly (not through QMimeData's API)
    }
}

\endlist

Definition at line 15 of file qmimedata.h.

Constructor & Destructor Documentation

◆ QMimeData()

QMimeData::QMimeData ( )

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

Definition at line 309 of file qmimedata.cpp.

◆ ~QMimeData()

QMimeData::~QMimeData ( )

Destroys the MIME data object.

Definition at line 317 of file qmimedata.cpp.

Member Function Documentation

◆ clear()

void QMimeData::clear ( )

Removes all the MIME type and data entries in the object.

Definition at line 642 of file qmimedata.cpp.

References d.

Referenced by QHaikuClipboard::mimeData(), QQnxClipboard::mimeData(), QtWayland::DataDeviceManager::overrideSelection(), QtWayland::DataDeviceManager::setCurrentSelectionSource(), QCocoaClipboard::setMimeData(), and QQnxClipboard::setMimeData().

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◆ colorData()

QVariant QMimeData::colorData ( ) const

Returns a color if the data stored in the object represents a color (MIME type application/x-color); otherwise returns a null variant.

A QVariant is used because QMimeData belongs to the Qt Core module, whereas QColor belongs to Qt GUI. To convert the QVariant to a QColor, simply use qvariant_cast(). For example:

if (event->mimeData()->hasColor()) {
    QColor color = qvariant_cast<QColor>(event->mimeData()->colorData());
    ...
}

See also: hasColor(), setColorData(), data()

Definition at line 511 of file qmimedata.cpp.

References applicationXColorLiteral(), and d.

Referenced by QWaylandMimeHelper::getByteArray(), and operator<<().

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◆ data()

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

Returns the data stored in the object in the format described by the MIME type specified by mimeType.

Definition at line 546 of file qmimedata.cpp.

References d, mimeType, and QVariant::toByteArray().

Referenced by QWaylandMimeHelper::getByteArray(), QWindowsOleDataObject::mimeData(), QtWayland::DataDeviceManager::overrideSelection(), dom::DataTransfer::setDataFromMimeData(), QHaikuClipboard::setMimeData(), ClipWindow::updateClipboard(), ClipWindow::updateData(), and QXcbDropData::xdndObtainData().

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◆ formats()

QStringList QMimeData::formats ( ) const

virtual

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.

See also: hasFormat(), setData(), data()

Reimplemented in QInternalMimeData, QMacPasteboardMimeSource, QIOSMimeData, QQnxClipboard::MimeData, QTextEditMimeData, and QQuickTextEditMimeData.

Definition at line 607 of file qmimedata.cpp.

References d, list, and QList< T >::reserve().

Referenced by QtWaylandClient::QWaylandPrimarySelectionSourceV1::QWaylandPrimarySelectionSourceV1(), QWindowsOleDataObject::QWindowsOleDataObject(), QBuiltInMimes::canConvertFromMime(), QTextEditMimeData::formats(), QQuickTextEditMimeData::formats(), QBuiltInMimes::formatsForMime(), QQuickDropAreaPrivate::getKeys(), hasFormat(), QtWayland::DataDeviceManager::offerFromCompositorToClient(), QtWayland::DataDeviceManager::offerRetainedSelection(), operator<<(), QtWayland::DataDeviceManager::overrideSelection(), dom::DataTransfer::setDataFromMimeData(), QHaikuClipboard::setMimeData(), QWindowsClipboard::setMimeData(), and ClipWindow::updateClipboard().

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◆ hasColor()

bool QMimeData::hasColor ( ) const

Returns true if the object can return a color (MIME type application/x-color); otherwise returns false.

See also: setColorData(), colorData(), hasFormat()

Definition at line 537 of file qmimedata.cpp.

References applicationXColorLiteral(), and hasFormat().

Referenced by operator<<().

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◆ hasFormat()

bool QMimeData::hasFormat ( const QString & mimeType ) const

virtual

Returns true if the object can return data for the MIME type specified by 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.

See also: formats(), setData(), data()

Reimplemented in QInternalMimeData, and QQnxClipboard::MimeData.

Definition at line 591 of file qmimedata.cpp.

References formats(), and mimeType.

Referenced by hasColor(), hasHtml(), hasImage(), hasText(), hasUrls(), and QXcbMime::mimeDataForAtom().

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◆ hasHtml()

bool QMimeData::hasHtml ( ) const

Returns true if the object can return HTML (MIME type text/html); otherwise returns false.

See also: setHtml(), html(), hasFormat()

Definition at line 447 of file qmimedata.cpp.

References hasFormat(), and textHtmlLiteral().

Referenced by operator<<(), and droparea::DropArea::paste().

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◆ hasImage()

bool QMimeData::hasImage ( ) const

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

See also: setImageData(), imageData(), hasFormat()

Definition at line 493 of file qmimedata.cpp.

References applicationXQtImageLiteral(), and hasFormat().

Referenced by QWindowsMimeImage::canConvertFromMime(), QWindowsMimeImage::convertFromMime(), QWindowsMimeImage::formatsForMime(), QWaylandMimeHelper::getByteArray(), QXcbDrag::handleDrop(), QXcbMime::mimeDataForAtom(), operator<<(), and droparea::DropArea::paste().

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◆ hasText()

bool QMimeData::hasText ( ) const

Returns true if the object can return plain text (MIME type text/plain); otherwise returns false.

See also: setText(), text(), hasHtml(), hasFormat()

Definition at line 411 of file qmimedata.cpp.

References hasFormat(), hasUrls(), and textPlainLiteral().

Referenced by QWindowsMimeText::canConvertFromMime(), QQuickTextInput::canPaste(), QWindowsMimeText::formatsForMime(), operator<<(), and droparea::DropArea::paste().

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◆ hasUrls()

bool QMimeData::hasUrls ( ) const

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

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

See also: setUrls(), urls(), hasFormat()

Definition at line 370 of file qmimedata.cpp.

References hasFormat(), and textUriListLiteral().

Referenced by QWindowsMimeURI::canConvertFromMime(), hasText(), and operator<<().

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◆ html()

QString QMimeData::html ( ) const

Returns a string if the data stored in the object is HTML (MIME type text/html); otherwise returns an empty string.

See also: hasHtml(), setData()

Definition at line 422 of file qmimedata.cpp.

References d, textHtmlLiteral(), and QVariant::toString().

Referenced by QWindowsMimeHtml::canConvertFromMime(), QWindowsMimeHtml::convertFromMime(), QBuiltInMimes::convertFromMime(), QWindowsMimeHtml::formatsForMime(), operator<<(), droparea::DropArea::paste(), and setHtml().

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◆ imageData()

QVariant QMimeData::imageData ( ) const

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 Qt Core module, whereas QImage belongs to Qt GUI. To convert the QVariant to a QImage, simply use qvariant_cast(). For example:

if (event->mimeData()->hasImage()) {
    QImage image = qvariant_cast<QImage>(event->mimeData()->imageData());
    ...
}

See also: hasImage()

Definition at line 464 of file qmimedata.cpp.

References applicationXQtImageLiteral(), and d.

Referenced by QWindowsMimeImage::canConvertFromMime(), QWindowsMimeImage::convertFromMime(), QWindowsMimeImage::formatsForMime(), QWaylandMimeHelper::getByteArray(), operator<<(), and droparea::DropArea::paste().

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◆ removeFormat()

void QMimeData::removeFormat ( const QString & mimeType )

Since: 4.4

Removes the data entry for mimeType in the object.

Definition at line 653 of file qmimedata.cpp.

References d, and mimeType.

◆ retrieveData()

QVariant QMimeData::retrieveData	(	const QString &	mimeType,
		QMetaType	type ) const

protectedvirtual

Returns a variant with the given type containing data for the MIME type specified by 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().

See also: data()

Reimplemented in QMacPasteboardMimeSource, QQnxClipboard::MimeData, QInternalMimeData, QIOSMimeData, QTextEditMimeData, and QQuickTextEditMimeData.

Definition at line 632 of file qmimedata.cpp.

References d, mimeType, and Q_UNUSED.

Referenced by QQnxClipboard::MimeData::retrieveData(), QInternalMimeData::retrieveData(), QTextEditMimeData::retrieveData(), QQuickTextEditMimeData::retrieveData(), and QMacMimeData::variantData().

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◆ setColorData()

void QMimeData::setColorData ( const QVariant & color )

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

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

See also: hasColor(), setData()

Definition at line 524 of file qmimedata.cpp.

References applicationXColorLiteral(), and d.

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◆ setData()

void QMimeData::setData	(	const QString &	mimeType,
		const QByteArray &	data )

Sets the data associated with the MIME type given by mimeType to the specified 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.

See also: hasFormat(), QMetaType, {QMetaType::}{Q_DECLARE_METATYPE()}

Definition at line 567 of file qmimedata.cpp.

References ba, QByteArray::chop(), d, dataToUrls(), QByteArray::endsWith(), and mimeType.

Referenced by QQuickDragAttachedPrivate::createMimeData(), QCocoaDrag::drag(), DragDropListModel::mimeData(), QHaikuClipboard::mimeData(), DragWidget::mouseMoveEvent(), FinalWidget::mouseMoveEvent(), QtWayland::DataDeviceManager::overrideSelection(), and QInternalMimeData::retrieveData().

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◆ setHtml()

void QMimeData::setHtml ( const QString & html )

Sets html as the HTML (MIME type text/html) used to represent the data.

See also: hasHtml(), setText(), setData()

Definition at line 435 of file qmimedata.cpp.

References d, html(), and textHtmlLiteral().

Referenced by QQuickDragAttachedPrivate::createMimeData(), and QHaikuClipboard::mimeData().

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◆ setImageData()

void QMimeData::setImageData ( const QVariant & image )

Sets the data in the object to the given image.

A QVariant is used because QMimeData belongs to the Qt Core module, whereas QImage belongs to Qt GUI. The conversion from QImage to QVariant is implicit. For example:

See also: hasImage(), setData()

Definition at line 481 of file qmimedata.cpp.

References applicationXQtImageLiteral(), and d.

Referenced by QQuickDragAttachedPrivate::createMimeData(), QClipboard::setImage(), QClipboard::setPixmap(), and src_gui_kernel_qclipboard::wrapper().

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◆ setText()

void QMimeData::setText ( const QString & text )

Sets text as the plain text (MIME type text/plain) used to represent the data.

See also: hasText(), setHtml(), setData()

Definition at line 399 of file qmimedata.cpp.

References d, text(), and textPlainLiteral().

Referenced by QWidgetTextControlPrivate::_q_copyLink(), QQuickDragAttachedPrivate::createMimeData(), QHaikuClipboard::mimeData(), MainWindow::mousePressEvent(), and QClipboard::setText().

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◆ setUrls()

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

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

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

Since Qt 5.0, setUrls also exports the urls as plain text, if setText was not called before, to make it possible to drop them into any lineedit and text editor.