The QClipboard class provides access to the window system clipboard.
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The clipboard offers a simple mechanism to copy and paste data between applications.
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QClipboard supports the same data types that QDragObject does, and uses similar mechanisms. For advanced clipboard usage read the drag-and-drop documentation.
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There is a single QClipboard object in an application, and you can access it using QApplication::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 TQImages 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().
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.
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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.
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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.
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<h4> Windows </h4>
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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.
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Windows does not have the concept of ownership; the clipboard is a fully global resource so all applications are notified of changes.
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See the multiclip example in the \fIQt Designer\fR examples directory for an example of a multiplatform clipboard application that also demonstrates selection handling.
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See also Environment Classes and Input/Output and Networking.
.SS "Member Type Documentation"
.SH "QClipboard::Mode"
.PP
This enum type is used to control which part of the system clipboard is used by QClipboard::data(), QClipboard::setData() and related functions.
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\fCQClipboard::Clipboard\fR - indicates that data should be stored and retrieved from the global clipboard.
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\fCQClipboard::Selection\fR - indicates that data should be stored and retrieved from the global mouse selection.
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\fINote\fR: Support for Selection is provided only on systems with a global mouse selection (e.g. X11).
.PP
See also QClipboard::supportsSelection().
.SH MEMBER FUNCTION DOCUMENTATION
.SH "void QClipboard::clear ( Mode mode )"
Clear the clipboard contents.
.PP
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, this function clears the the global clipboard contents. If \fImode\fR is QClipboard::Selection, this function clears the global mouse selection contents.
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See also QClipboard::Mode and supportsSelection().
.SH "void QClipboard::clear ()"
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
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.
Returns a reference to a QMimeSource representation of the current clipboard data.
.PP
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the data is retrieved from the global clipboard. If \fImode\fR is QClipboard::Selection, the data is retrieved from the global mouse selection.
.PP
See also setData().
.SH "QMimeSource * QClipboard::data () const"
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
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.
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.
.PP
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the image is retrieved from the global clipboard. If \fImode\fR is QClipboard::Selection, the image is retrieved from the global mouse selection.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
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.
.SH "bool QClipboard::ownsClipboard () const"
Returns TRUE if this clipboard object owns the clipboard data; otherwise returns FALSE.
.SH "bool QClipboard::ownsSelection () const"
Returns TRUE if this clipboard object owns the mouse selection data; otherwise returns FALSE.
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.
.PP
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the pixmap is retrieved from the global clipboard. If \fImode\fR is QClipboard::Selection, the pixmap is retrieved from the global mouse selection.
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See also setPixmap(), image(), data(), and QPixmap::convertFromImage().
.SH "QPixmap QClipboard::pixmap () const"
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
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.
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.
Sets the clipboard data to \fIsrc\fR. 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.
.PP
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the data is retrieved from the global clipboard. If \fImode\fR is QClipboard::Selection, the data is retrieved from the global mouse selection.
.PP
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.
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The setText(), setImage() and setPixmap() functions are simpler wrappers for setting text, image and pixmap data respectively.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
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.
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the image is stored in the global clipboard. If \fImode\fR is QClipboard::Selection, the data is stored in the global mouse selection.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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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.
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the pixmap is stored in the global clipboard. If \fImode\fR is QClipboard::Selection, the pixmap is stored in the global mouse selection.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
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.
\fBThis function is obsolete.\fR It is provided to keep old source working. We strongly advise against using it in new code.
.PP
Use the QClipboard::data(), QClipboard::setData() and related functions which take a QClipboard::Mode argument.
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Sets the clipboard selection mode. If \fIenable\fR 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.
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See also supportsSelection() and selectionModeEnabled().
Copies \fItext\fR into the clipboard as plain text.
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The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the text is stored in the global clipboard. If \fImode\fR is QClipboard::Selection, the text is stored in the global mouse selection.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
.PP
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.
.SH "bool QClipboard::supportsSelection () const"
Returns TRUE if the clipboard supports mouse selection; otherwise returns FALSE.
Returns the clipboard text as plain text, or a null string if the clipboard does not contain any text.
.PP
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the text is retrieved from the global clipboard. If \fImode\fR is QClipboard::Selection, the text is retrieved from the global mouse selection.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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Returns the clipboard text in subtype \fIsubtype\fR, or a null string if the clipboard does not contain any text. If \fIsubtype\fR is null, any subtype is acceptable, and \fIsubtype\fR is set to the chosen subtype.
.PP
The \fImode\fR argument is used to control which part of the system clipboard is used. If \fImode\fR is QClipboard::Clipboard, the text is retrieved from the global clipboard. If \fImode\fR is QClipboard::Selection, the text is retrieved from the global mouse selection.
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Common values for \fIsubtype\fR are "plain" and "html".
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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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.
