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QClipboard(3qt) 								  QClipboard(3qt)

NAME
       QClipboard - Access to the window system clipboard

SYNOPSIS
       #include <qclipboard.h>

       Inherits QObject.

   Public Members
       enum Mode { Clipboard, Selection }
       void clear ( Mode mode )
       void clear ()
       bool supportsSelection () const
       bool ownsSelection () const
       bool ownsClipboard () const
       void setSelectionMode ( bool enable )  (obsolete)
       bool selectionModeEnabled () const  (obsolete)
       QString text ( Mode mode ) const
       QString text ( QCString & subtype, Mode mode ) const
       void setText ( const QString & text, Mode mode )
       QMimeSource * data ( Mode mode ) const
       void setData ( QMimeSource * src, Mode mode )
       QImage image ( Mode mode ) const
       QPixmap pixmap ( Mode mode ) const
       void setImage ( const QImage & image, Mode mode )
       void setPixmap ( const QPixmap & pixmap, Mode mode )
       QString text () const
       QString text ( QCString & subtype ) const
       void setText ( const QString & text )
       QMimeSource * data () const
       void setData ( QMimeSource * src )
       QImage image () const
       QPixmap pixmap () const
       void setImage ( const QImage & image )
       void setPixmap ( const QPixmap & pixmap )

   Signals
       void selectionChanged ()
       void dataChanged ()

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

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

       QClipboard supports the same data types that QDragObject does, and uses similar
       mechanisms. For advanced clipboard usage read the drag-and-drop documentation.

       There is a single QClipboard object in an application, and you can access it using
       QApplication::clipboard().

       Example:

	   QClipboard *cb = QApplication::clipboard();
	   // Copy text from the clipboard (paste)
	   QString text = cb->text(QClipboard::Clipboard);
	   if ( !text.isNull() )
	       qDebug( "The clipboard contains: " + text );
	   // Copy text into the clipboard
	   cb->setText( "This text can be pasted by other programs",
			QClipboard::Clipboard );

       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 setData() function is the ultimate in
       flexibility: it allows you to add any QMimeSource 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().

Platform Specific Information
       <h4> X11 </h4>

       The X11 Window System has the concept of a separate selection and clipboard. When text is
       selected, it is immediately available as the global mouse selection. The global mouse
       selection may later be copied to the clipboard. By convention, the middle mouse button is
       used to paste the global mouse selection.

       X11 also has the concept of ownership; if you change the selection within a window, X11
       will only notify the owner and the previous owner of the change, i.e. it will not notify
       all applications that the selection or clipboard data changed.

       Lastly, the X11 clipboard is event driven, i.e. the clipboard will not function properly
       if the event loop is not running. Similarly, it is recommended that the contents of the
       clipboard are stored or retrieved in direct response to user-input events, e.g. mouse
       button or key presses and releases. You should not store or retrieve the clipboard
       contents in response to timer or non-user-input events.

       <h4> Windows </h4>

       Microsoft Windows does not support the global mouse selection; it only supports the global
       clipboard, e.g. Windows only adds text to the clipboard when an explicit copy or cut is
       made.

       Windows does not have the concept of ownership; the clipboard is a fully global resource
       so all applications are notified of changes.

       See the multiclip example in the Qt Designer examples directory for an example of a
       multiplatform clipboard application that also demonstrates selection handling.

       See also Environment Classes and Input/Output and Networking.

   Member Type Documentation
QClipboard::Mode
       This enum type is used to control which part of the system clipboard is used by
       QClipboard::data(), QClipboard::setData() and related functions.

       QClipboard::Clipboard - indicates that data should be stored and retrieved from the global
       clipboard.

       QClipboard::Selection - indicates that data should be stored and retrieved from the global
       mouse selection.

       Note: Support for Selection is provided only on systems with a global mouse selection
       (e.g. X11).

       See also QClipboard::supportsSelection().

MEMBER FUNCTION DOCUMENTATION
void QClipboard::clear ( Mode mode )
       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 the global clipboard contents. If mode
       is QClipboard::Selection, this function clears the global mouse selection contents.

       See also QClipboard::Mode and supportsSelection().

void QClipboard::clear ()
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::clear() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

QMimeSource * QClipboard::data ( Mode mode ) const
       Returns a reference to a QMimeSource representation of the current clipboard data.

       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.

       See also setData().

QMimeSource * QClipboard::data () const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::data() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

void QClipboard::dataChanged () [signal]
       This signal is emitted when the clipboard data is changed.

QImage QClipboard::image ( Mode mode ) 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(), data(), and QImage::isNull().

QImage QClipboard::image () const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::image() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

bool QClipboard::ownsClipboard () const
       Returns TRUE if this clipboard object owns the clipboard data; otherwise returns FALSE.

bool QClipboard::ownsSelection () const
       Returns TRUE if this clipboard object owns the mouse selection data; otherwise returns
       FALSE.

QPixmap QClipboard::pixmap ( Mode mode ) 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(), data(), and QPixmap::convertFromImage().

QPixmap QClipboard::pixmap () const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::pixmap() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

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 doesn't support selections.

bool QClipboard::selectionModeEnabled () const
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

       Use the QClipboard::data(), QClipboard::setData() and related functions which take a
       QClipboard::Mode argument.

       Returns the selection mode.

       See also setSelectionMode() and supportsSelection().

void QClipboard::setData ( QMimeSource * src, Mode mode )
       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 setData() 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 retrieved from the global clipboard. If mode is
       QClipboard::Selection, the data is retrieved from the global mouse selection.

       The QDragObject subclasses are reasonable objects to put into the clipboard (but do not
       try to call QDragObject::drag() on the same object). Any QDragObject placed in the
       clipboard should have a parent of 0. Do not put QDragMoveEvent or QDropEvent subclasses in
       the clipboard, as they do not belong to the event handler which receives them.

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

       See also data().

void QClipboard::setData ( QMimeSource * src )
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::setData() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

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

	       setData( new QImageDrag(image), mode )

       See also image(), setPixmap(), and setData().

void QClipboard::setImage ( const QImage & image )
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::setImage() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

void QClipboard::setPixmap ( const QPixmap & pixmap, Mode mode )
       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(), and setData().

void QClipboard::setPixmap ( const QPixmap & pixmap )
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::setPixmap() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

void QClipboard::setSelectionMode ( bool enable )
       This function is obsolete. It is provided to keep old source working. We strongly advise
       against using it in new code.

       Use the QClipboard::data(), QClipboard::setData() and related functions which take a
       QClipboard::Mode argument.

       Sets the clipboard selection mode. If enable is TRUE, then subsequent calls to
       QClipboard::setData() and other functions which put data into the clipboard will put the
       data into the mouse selection, otherwise the data will be put into the clipboard.

       See also supportsSelection() and selectionModeEnabled().

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

       See also text() and setData().

       Example: regexptester/regexptester.cpp.

void QClipboard::setText ( const QString & text )
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::setText() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

bool QClipboard::supportsSelection () const
       Returns TRUE if the clipboard supports mouse selection; otherwise returns FALSE.

       Example: regexptester/regexptester.cpp.

QString QClipboard::text ( Mode mode ) const
       Returns the clipboard text as plain text, or a null 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.

       See also setText(), data(), and QString::operator!().

QString QClipboard::text ( QCString & subtype, Mode mode ) const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the clipboard text in subtype subtype, or a null 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".

       See also setText(), data(), and QString::operator!().

QString QClipboard::text () const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       This function uses the QClipboard::text() function which takes a QClipboard::Mode
       argument. The value of the mode argument is determined by the return value of
       selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument is
       QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

QString QClipboard::text ( QCString & subtype ) const
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the clipboard text in subtype subtype, or a null string if the clipboard does not
       contain any text. This function uses the QClipboard::text() function which takes a
       QClipboard::Mode argument.  The value of the mode argument is determined by the return
       value of selectionModeEnabled(). If selectionModeEnabled() returns TRUE, the mode argument
       is QClipboard::Selection, otherwise the mode argument is QClipboard::Clipboard.

SEE ALSO
       http://doc.trolltech.com/qclipboard.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the license file
       included in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qclipboard.3qt) and the Qt version (3.3.8).

Trolltech AS				 2 February 2007			  QClipboard(3qt)
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