<!-- ##### SECTION Title ##### -->Clipboards<!-- ##### SECTION Short_Description ##### -->Storing data on clipboards<!-- ##### SECTION Long_Description ##### -->  <para>    The #GtkClipboard object represents a clipboard of data shared    between different processes or between different widgets in    the same process. Each clipboard is identified by a name encoded as a    #GdkAtom. (Conversion to and from strings can be done with    gdk_atom_intern() and gdk_atom_name().) The default clipboard    corresponds to the "CLIPBOARD" atom; another commonly used clipboard    is the "PRIMARY" clipboard, which, in X, traditionally contains    the currently selected text.  </para>  <para>    To support having a number of different formats on the clipboard    at the same time, the clipboard mechanism allows providing    callbacks instead of the actual data.  When you set the contents    of the clipboard, you can either supply the data directly (via    functions like gtk_clipboard_set_text()), or you can supply a    callback to be called at a later time when the data is needed (via    gtk_clipboard_set_with_data() or gtk_clipboard_set_with_owner().)    Providing a callback also avoids having to make copies of the data    when it is not needed.  </para>  <para>    gtk_clipboard_set_with_data() and gtk_clipboard_set_with_owner()    are quite similar; the choice between the two depends mostly on    which is more convenient in a particular situation.    The former is most useful when you want to have a blob of data    with callbacks to convert it into the various data types that you    advertise. When the @clear_func you provided is called, you    simply free the data blob. The latter is more useful when the    contents of clipboard reflect the internal state of a #GObject    (As an example, for the PRIMARY clipboard, when an entry widget    provides the clipboard's contents the contents are simply the    text within the selected region.) If the contents change, the    entry widget can call gtk_clipboard_set_with_owner() to update    the timestamp for clipboard ownership, without having to worry    about @clear_func being called.  </para>  <para>    Requesting the data from the clipboard is essentially    asynchronous. If the contents of the clipboard are provided within    the same process, then a direct function call will be made to    retrieve the data, but if they are provided by another process,    then the data needs to be retrieved from the other process, which    may take some time. To avoid blocking the user interface, the call    to request the selection, gtk_clipboard_request_contents() takes a    callback that will be called when the contents are received (or    when the request fails.) If you don't want to deal with providing    a separate callback, you can also use gtk_clipboard_wait_for_contents().    What this does is run the GLib main loop recursively waiting for    the contents. This can simplify the code flow, but you still have    to be aware that other callbacks in your program can be called    while this recursive mainloop is running.  </para>  <para>    Along with the functions to get the clipboard contents as an    arbitrary data chunk, there are also functions to retrieve    it as text, gtk_clipboard_request_text() and    gtk_clipboard_wait_for_text(). These functions take care of    determining which formats are advertised by the clipboard    provider, asking for the clipboard in the best available format    and converting the results into the UTF-8 encoding. (The standard    form for representing strings in GTK+.)  </para><!-- ##### SECTION See_Also ##### --><para><variablelist><varlistentry><term>#GtkSelection</term><listitem><para>#GtkClipboard provides a high-level wrapper around the	    lower level routines that deal with X selections. It is	    also possibly to directly manipulate the X selections,	    though it is seldom necessary to do so.</para></listitem></varlistentry></variablelist></para><!-- ##### SECTION Stability_Level ##### --><!-- ##### STRUCT GtkClipboard ##### --><para></para><!-- ##### USER_FUNCTION GtkClipboardReceivedFunc ##### --><para>    A function to be called when the results of gtk_clipboard_request_contents()    are received, or when the request fails.</para>@clipboard: the #GtkClipboard@selection_data: a #GtkSelectionData containing the data was received.                 If retrieving the data failed, then then length field                 of @selection_data will be negative.@data: the @user_data supplied to gtk_clipboard_request_contents().<!-- ##### USER_FUNCTION GtkClipboardTextReceivedFunc ##### --><para>    A function to be called when the results of gtk_clipboard_request_text()    are received, or when the request fails.</para>@clipboard: the #GtkClipboard@text: the text received, as a UTF-8 encoded string, or %NULL            if retrieving the data failed.@data: the @user_data supplied to gtk_clipboard_request_text().<!-- ##### USER_FUNCTION GtkClipboardTargetsReceivedFunc ##### --><para>    A function to be called when the results of gtk_clipboard_request_targets()    are received, or when the request fails.</para>@clipboard: the #GtkClipboard@atoms: the supported targets, as array of #GdkAtom, or %NULL             if retrieving the data failed.@n_atoms: the length of the @atoms array.@data: the @user_data supplied to gtk_clipboard_request_targets().@Since: 2.4<!-- ##### USER_FUNCTION GtkClipboardGetFunc ##### --><para>A function that will be called to provide the contents of the selection.If multiple types of data were advertised, the requested type canbe determined from the @info parameter or by checking the target fieldof @selection_data. If the data could successfully be converted intothen it should be stored into the @selection_data object bycalling gtk_selection_data_set() (or related functions suchas gtk_selection_data_set_text()). If no data is set, the requestorwill be informed that the attempt to get the data failed.    </para>@clipboard: the #GtkClipboard@selection_data: a #GtkSelectionData argument in which the requested                     data should be stored.@info: the info field corresponding to the requested                     target from the #GtkTargetEntry array passed to                     gtk_clipboard_set_with_data() or gtk_clipboard_set_with_owner().@user_data_or_owner: the @user_data argument passed to gtk_clipboard_set_with_data(), or                     the @owner argument passed to gtk_clipboard_set_with_owner()<!-- ##### USER_FUNCTION GtkClipboardClearFunc ##### --><para>A function that will be called when the contents of the clipboard are changedor cleared. Once this has called, the @user_data_or_owner argumentwill not be used again.</para>@clipboard: the #GtkClipboard@user_data_or_owner: the @user_data argument passed to gtk_clipboard_set_with_data(), or                     the @owner argument passed to gtk_clipboard_set_with_owner()<!-- ##### FUNCTION gtk_clipboard_get ##### --><para></para>@selection: @Returns: <!-- ##### FUNCTION gtk_clipboard_get_for_display ##### --><para></para>@display: @selection: @Returns: <!-- ##### FUNCTION gtk_clipboard_get_display ##### --><para></para>@clipboard: @Returns: <!-- ##### FUNCTION gtk_clipboard_set_with_data ##### --><para></para>@clipboard: @targets: @n_targets: @get_func: @clear_func: @user_data: @Returns: <!-- ##### FUNCTION gtk_clipboard_set_with_owner ##### --><para></para>@clipboard: @targets: @n_targets: @get_func: @clear_func: @owner: @Returns: <!-- ##### FUNCTION gtk_clipboard_get_owner ##### --><para></para>@clipboard: @Returns: <!-- ##### FUNCTION gtk_clipboard_clear ##### --><para></para>@clipboard: <!-- ##### FUNCTION gtk_clipboard_set_text ##### --><para></para>@clipboard: @text: @len: <!-- ##### FUNCTION gtk_clipboard_set_image ##### --><para></para>@clipboard: @pixbuf: <!-- ##### FUNCTION gtk_clipboard_request_contents ##### --><para></para>@clipboard: @target: @callback: @user_data: <!-- ##### FUNCTION gtk_clipboard_request_text ##### --><para></para>@clipboard: @callback: @user_data: <!-- ##### FUNCTION gtk_clipboard_request_image ##### --><para></para>@clipboard: @callback: @user_data: <!-- ##### FUNCTION gtk_clipboard_request_targets ##### --><para></para>@clipboard: @callback: @user_data: <!-- ##### FUNCTION gtk_clipboard_wait_for_contents ##### --><para></para>@clipboard: @target: @Returns: <!-- ##### FUNCTION gtk_clipboard_wait_for_text ##### --><para></para>@clipboard: @Returns: <!-- ##### FUNCTION gtk_clipboard_wait_for_image ##### --><para></para>@clipboard: @Returns: <!-- ##### FUNCTION gtk_clipboard_wait_is_text_available ##### --><para></para>@clipboard: @Returns: <!-- ##### FUNCTION gtk_clipboard_wait_is_image_available ##### --><para></para>@clipboard: @Returns: <!-- ##### FUNCTION gtk_clipboard_wait_for_targets ##### --><para></para>@clipboard: @targets: @n_targets: @Returns: <!--Local variables:mode: sgmlsgml-parent-document: ("../gtk-docs.sgml" "book" "refsect2" "")End:--><!-- ##### FUNCTION gtk_clipboard_wait_is_target_available ##### --><para></para>@clipboard: @target: @Returns: <!-- ##### FUNCTION gtk_clipboard_set_can_store ##### --><para></para>@clipboard: @targets: @n_targets: <!-- ##### FUNCTION gtk_clipboard_store ##### --><para></para>@clipboard: