The QClipboard class provides access to the window system clipboard. More...

#include <qclipboard.h>

Inheritance diagram for QClipboard:

Collaboration diagram for QClipboard:

Public Types
enum	Mode { Clipboard , Selection , FindBuffer , LastMode = FindBuffer }
	\keyword clipboard mode More...

Signals
void	changed (QClipboard::Mode mode)

void	selectionChanged ()
	This signal is emitted when the selection is changed.

void	findBufferChanged ()

void	dataChanged ()
	This signal is emitted when the clipboard data is changed.

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.

Public Member Functions
void	clear (Mode mode=Clipboard)
	Clear the clipboard contents.

bool	supportsSelection () const
	Returns `true` if the clipboard supports mouse selection; otherwise returns `false`.

bool	supportsFindBuffer () const
	Returns `true` if the clipboard supports a separate search buffer; otherwise returns `false`.

bool	ownsSelection () const
	Returns `true` if this clipboard object owns the mouse selection data; otherwise returns `false`.

bool	ownsClipboard () const
	Returns `true` if this clipboard object owns the clipboard data; otherwise returns `false`.

bool	ownsFindBuffer () const

QString	text (Mode mode=Clipboard) const
	Returns the clipboard text as plain text, or an empty string if the clipboard does not contain any text.

QString	text (QString &subtype, Mode mode=Clipboard) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Returns the clipboard text in subtype subtype, or an empty string if the clipboard does not contain any text.

void	setText (const QString &, Mode mode=Clipboard)
	Copies text into the clipboard as plain text.

const QMimeData *	mimeData (Mode mode=Clipboard) const
	Returns a pointer to a QMimeData representation of the current clipboard data (can be \nullptr if the given mode is not supported by the platform).

void	setMimeData (QMimeData *data, Mode mode=Clipboard)
	Sets the clipboard data to src.

QImage	image (Mode mode=Clipboard) const
	Returns the clipboard image, or returns a null image if the clipboard does not contain an image or if it contains an image in an unsupported image format.

QPixmap	pixmap (Mode mode=Clipboard) const
	Returns the clipboard pixmap, or null if the clipboard does not contain a pixmap.

void	setImage (const QImage &, Mode mode=Clipboard)
	Copies the image into the clipboard.

void	setPixmap (const QPixmap &, Mode mode=Clipboard)
	Copies pixmap into the clipboard.

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`.

Friends
class	QApplication

class	QApplicationPrivate

class	QGuiApplication

class	QBaseApplication

class	QDragManager

class	QPlatformClipboard

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

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 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)

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

The QClipboard class provides access to the window system clipboard.

\inmodule QtGui

The clipboard offers a simple mechanism to copy and paste data between applications.

QClipboard supports the same data types that QDrag does, and uses similar mechanisms. For advanced clipboard usage read \l{Drag and Drop}.

There is a single QClipboard object in an application, accessible as QGuiApplication::clipboard().

Example:

QClipboard *clipboard = QGuiApplication::clipboard();
QString originalText = clipboard->text();
// etc.
clipboard->setText(newText);

QClipboard features some convenience functions to access common data types: setText() allows the exchange of Unicode text and setPixmap() and setImage() allows the exchange of QPixmaps and QImages between applications. The setMimeData() function is the ultimate in flexibility: it allows you to add any QMimeData into the clipboard. There are corresponding getters for each of these, e.g. text(), image() and pixmap(). You can clear the clipboard by calling clear().

A typical example of the use of these functions follows:

void DropArea::paste()
{
    const QClipboard *clipboard = QApplication::clipboard();
    const QMimeData *mimeData = clipboard->mimeData();
 
    if (mimeData->hasImage()) {
        setPixmap(qvariant_cast<QPixmap>(mimeData->imageData()));
    } else if (mimeData->hasHtml()) {
        setText(mimeData->html());
        setTextFormat(Qt::RichText);
    } else if (mimeData->hasText()) {
        setText(mimeData->text());
        setTextFormat(Qt::PlainText);
    } else {
        setText(tr("Cannot display data"));
    }
}

Definition at line 19 of file qclipboard.h.

Member Enumeration Documentation

◆ Mode

enum QClipboard::Mode

\keyword clipboard mode

This enum type is used to control which part of the system clipboard is used by QClipboard::mimeData(), QClipboard::setMimeData() and related functions.

\value Clipboard indicates that data should be stored and retrieved from the global clipboard.

\value Selection indicates that data should be stored and retrieved from the global mouse selection. Support for Selection is provided only on systems with a global mouse selection (e.g. X11).

\value FindBuffer indicates that data should be stored and retrieved from the Find buffer. This mode is used for holding search strings on \macos.

\omitvalue LastMode

See also: QClipboard::supportsSelection()

Enumerator
Clipboard
Selection
FindBuffer
LastMode

Definition at line 27 of file qclipboard.h.

Member Function Documentation

◆ changed

void QClipboard::changed ( QClipboard::Mode mode )

signal

Since: 4.2

This signal is emitted when the data for the given clipboard mode is changed.

See also: dataChanged(), selectionChanged(), findBufferChanged()

◆ clear()

void QClipboard::clear ( Mode mode = Clipboard )

Clear the clipboard contents.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, this function clears the global clipboard contents. If mode is QClipboard::Selection, this function clears the global mouse selection contents. If mode is QClipboard::FindBuffer, this function clears the search string buffer.

See also: QClipboard::Mode, supportsSelection()

Definition at line 464 of file qclipboard.cpp.

References setMimeData().

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◆ dataChanged

void QClipboard::dataChanged ( )

signal

This signal is emitted when the clipboard data is changed.

On \macos and with Qt version 4.3 or higher, clipboard changes made by other applications will only be detected when the application is activated.

See also: findBufferChanged(), selectionChanged(), changed()

Referenced by ClipWindow::ClipWindow().

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◆ findBufferChanged

void QClipboard::findBufferChanged ( )

signal

Since: 4.2

This signal is emitted when the find buffer is changed. This only applies to \macos.

With Qt version 4.3 or higher, clipboard changes made by other applications will only be detected when the application is activated.

See also: dataChanged(), selectionChanged(), changed()

◆ image()

QImage QClipboard::image ( Mode mode = Clipboard ) const

Returns the clipboard image, or returns a null image if the clipboard does not contain an image or if it contains an image in an unsupported image format.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the image is retrieved from the global clipboard. If mode is QClipboard::Selection, the image is retrieved from the global mouse selection.

See also: setImage(), pixmap(), mimeData(), QImage::isNull()

Definition at line 317 of file qclipboard.cpp.

References mimeData.

◆ mimeData()

const QMimeData * QClipboard::mimeData ( Mode mode = Clipboard ) const

Returns a pointer to a QMimeData representation of the current clipboard data (can be \nullptr if the given mode is not supported by the platform).

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the data is retrieved from the global clipboard. If mode is QClipboard::Selection, the data is retrieved from the global mouse selection. If mode is QClipboard::FindBuffer, the data is retrieved from the search string buffer.

The text(), image(), and pixmap() functions are simpler wrappers for retrieving text, image, and pixmap data.

Note: The pointer returned might become invalidated when the contents of the clipboard changes; either by calling one of the setter functions or externally by the system clipboard changing.

See also: setMimeData()

Definition at line 412 of file qclipboard.cpp.

References QPlatformClipboard::mimeData(), QGuiApplicationPrivate::platformIntegration(), and QPlatformClipboard::supportsMode().

Referenced by droparea::DropArea::paste(), ClipWindow::updateClipboard(), and ClipWindow::updateData().

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◆ ownsClipboard()

bool QClipboard::ownsClipboard ( ) const

Returns true if this clipboard object owns the clipboard data; otherwise returns false.

Definition at line 491 of file qclipboard.cpp.

References Clipboard.

◆ ownsFindBuffer()

bool QClipboard::ownsFindBuffer ( ) const

Since: 4.2

Returns true if this clipboard object owns the find buffer data; otherwise returns false.

Definition at line 511 of file qclipboard.cpp.

References FindBuffer.

◆ ownsSelection()

bool QClipboard::ownsSelection ( ) const

Returns true if this clipboard object owns the mouse selection data; otherwise returns false.

Definition at line 500 of file qclipboard.cpp.

References Selection.

◆ pixmap()

QPixmap QClipboard::pixmap ( Mode mode = Clipboard ) const

Returns the clipboard pixmap, or null if the clipboard does not contain a pixmap.

Note that this can lose information. For example, if the image is 24-bit and the display is 8-bit, the result is converted to 8 bits, and if the image has an alpha channel, the result just has a mask.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the pixmap is retrieved from the global clipboard. If mode is QClipboard::Selection, the pixmap is retrieved from the global mouse selection.

See also: setPixmap(), image(), mimeData(), QPixmap::convertFromImage()

Definition at line 362 of file qclipboard.cpp.

References mimeData.

◆ selectionChanged

void QClipboard::selectionChanged ( )

signal

This signal is emitted when the selection is changed.

This only applies to windowing systems that support selections, e.g. X11. Windows and \macos don't support selections.

See also: dataChanged(), findBufferChanged(), changed()

◆ setImage()

void QClipboard::setImage	(	const QImage &	image,
		Mode	mode = Clipboard )

Copies the image into the clipboard.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the image is stored in the global clipboard. If mode is QClipboard::Selection, the data is stored in the global mouse selection.

This is shorthand for:

QMimeData *data = new QMimeData;
data->setImageData(image);
clipboard->setMimeData(data, mode);

See also: image(), setPixmap(), setMimeData()

Definition at line 340 of file qclipboard.cpp.

References QMimeData::setImageData(), and setMimeData().

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◆ setMimeData()

void QClipboard::setMimeData	(	QMimeData *	src,
		Mode	mode = Clipboard )

Sets the clipboard data to src.

Ownership of the data is transferred to the clipboard. If you want to remove the data either call clear() or call setMimeData() again with new data.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the data is stored in the global clipboard. If mode is QClipboard::Selection, the data is stored in the global mouse selection. If mode is QClipboard::FindBuffer, the data is stored in the search string buffer.

The setText(), setImage() and setPixmap() functions are simpler wrappers for setting text, image and pixmap data respectively.

See also: mimeData()

Definition at line 438 of file qclipboard.cpp.

References QGuiApplicationPrivate::platformIntegration(), qDebug, QPlatformClipboard::setMimeData(), and QPlatformClipboard::supportsMode().

Referenced by clear(), QWidgetTextControlPrivate::setClipboardSelection(), setImage(), setPixmap(), setText(), and src_gui_kernel_qclipboard::wrapper().

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◆ setPixmap()

void QClipboard::setPixmap	(	const QPixmap &	pixmap,
		Mode	mode = Clipboard )

Copies pixmap into the clipboard.

Note that this is slower than setImage() because it needs to convert the QPixmap to a QImage first.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the pixmap is stored in the global clipboard. If mode is QClipboard::Selection, the pixmap is stored in the global mouse selection.

See also: pixmap(), setImage(), setMimeData()

Definition at line 381 of file qclipboard.cpp.

References pixmap, QMimeData::setImageData(), and setMimeData().

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◆ setText()

void QClipboard::setText	(	const QString &	text,
		Mode	mode = Clipboard )

Copies text into the clipboard as plain text.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the text is stored in the global clipboard. If mode is QClipboard::Selection, the text is stored in the global mouse selection. If mode is QClipboard::FindBuffer, the text is stored in the search string buffer.

See also: text(), setMimeData()

Definition at line 297 of file qclipboard.cpp.

References setMimeData(), QMimeData::setText(), and text.

Referenced by src_gui_kernel_qclipboard::wrapper().

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◆ supportsFindBuffer()

bool QClipboard::supportsFindBuffer ( ) const

Returns true if the clipboard supports a separate search buffer; otherwise returns false.

Definition at line 482 of file qclipboard.cpp.

References FindBuffer.

◆ supportsSelection()

bool QClipboard::supportsSelection ( ) const

Returns true if the clipboard supports mouse selection; otherwise returns false.

Definition at line 473 of file qclipboard.cpp.

References Selection.

Referenced by QWidgetTextControlPrivate::setClipboardSelection().

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◆ text() [1/2]

QString QClipboard::text ( Mode mode = Clipboard ) const

Returns the clipboard text as plain text, or an empty string if the clipboard does not contain any text.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the text is retrieved from the global clipboard. If mode is QClipboard::Selection, the text is retrieved from the global mouse selection. If mode is QClipboard::FindBuffer, the text is retrieved from the search string buffer.

See also: setText(), mimeData()

Definition at line 279 of file qclipboard.cpp.

References mimeData.

Referenced by src_gui_kernel_qclipboard::wrapper().

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◆ text() [2/2]

QString QClipboard::text	(	QString &	subtype,
		Mode	mode = Clipboard ) const

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Returns the clipboard text in subtype subtype, or an empty string if the clipboard does not contain any text.

If subtype is null, any subtype is acceptable, and subtype is set to the chosen subtype.

The mode argument is used to control which part of the system clipboard is used. If mode is QClipboard::Clipboard, the text is retrieved from the global clipboard. If mode is QClipboard::Selection, the text is retrieved from the global mouse selection.

Common values for subtype are "plain" and "html".

Note that calling this function repeatedly, for instance from a key event handler, may be slow. In such cases, you should use the dataChanged() signal instead.

See also: setText(), mimeData()

Definition at line 235 of file qclipboard.cpp.

References QByteArray::data(), QStringDecoder::decode(), QStringConverter::encodingForData(), QString::isEmpty(), mimeData, QString::sliced(), and QStringConverter::Utf8.

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Friends And Related Symbol Documentation

◆ QApplication

friend class QApplication

friend

Definition at line 57 of file qclipboard.h.

◆ QApplicationPrivate

friend class QApplicationPrivate

friend

Definition at line 58 of file qclipboard.h.

◆ QBaseApplication

friend class QBaseApplication

friend

Definition at line 60 of file qclipboard.h.

◆ QDragManager

friend class QDragManager

friend

Definition at line 61 of file qclipboard.h.

◆ QGuiApplication

friend class QGuiApplication

friend

Definition at line 59 of file qclipboard.h.

◆ QPlatformClipboard

friend class QPlatformClipboard

friend

Definition at line 62 of file qclipboard.h.

The documentation for this class was generated from the following files:

qtbase/src/gui/kernel/qclipboard.h (05fc3aef53348fb58be6308076e000825b704e58)
qtbase/src/gui/kernel/qclipboard.cpp (2b841d40b2647d14aea2a07af4b9ab5a38d43faf)

Public Types

Signals

Public Member Functions

Friends

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ Mode

Member Function Documentation

◆ changed

◆ clear()

◆ dataChanged

◆ findBufferChanged

◆ image()

◆ mimeData()

◆ ownsClipboard()

◆ ownsFindBuffer()

◆ ownsSelection()

◆ pixmap()

◆ selectionChanged

◆ setImage()

◆ setMimeData()

◆ setPixmap()

◆ setText()

◆ supportsFindBuffer()

◆ supportsSelection()

◆ text() [1/2]

◆ text() [2/2]

Friends And Related Symbol Documentation

◆ QApplication

◆ QApplicationPrivate

◆ QBaseApplication

◆ QDragManager

◆ QGuiApplication

◆ QPlatformClipboard