forked from AuroraMiddleware/gtk
dc754528a0
Mon Oct 22 14:08:26 2001 Jonathan Blandford <jrb@redhat.com> * demos/gtk-demo/appwindow.c: Remove handle_box from App demo. * gtk/gtktreeview.c (size_allocate): Move to a different drawing system. Instead of having a window the size of the tree, we have a window the size of widget->allocation, and simply draw with the offset. (coords_are_over_arrow): ditto. Move to window coordinates. (do_prelight): ditto (do_unprelight): ditto * gtk/gtktreemodelsort.c (gtk_tree_model_sort_rows_reordered): Minor fix from Kristian Rietveld to fix unsorted case.
164 lines
5.6 KiB
Plaintext
164 lines
5.6 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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Selections
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<!-- ##### SECTION Short_Description ##### -->
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functions for transfering data via the X selection mechanism.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The X selection mechanism provides a way to transfer
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arbitrary chunks of data between programs.
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A <firstterm>selection</firstterm> is a essentially
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a named clipboard, identified by a string interned
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as a #GdkAtom. By claiming ownership of a selection,
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an application indicates that it will be responsible
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for supplying its contents. The most common
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selections are <literal>PRIMARY</literal> and
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<literal>CLIPBOARD</literal>.
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</para>
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<para>
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The contents of a selection can be represented in
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a number of formats, called <firstterm>targets</firstterm>.
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Each target is identified by an atom. A list of
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all possible targets supported by the selection owner
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can be retrieved by requesting the special target
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<literal>TARGETS</literal>. When a selection is
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retrieved, the data is accompanied by a type
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(an atom), and a format (an integer, representing
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the number of bits per item).
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See <link linkend="gdk-Properties-and-Atoms">Properties and Atoms</link>
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for more information.
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</para>
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<para>
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The functions in this section only contain the lowlevel
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parts of the selection protocol. A considerably more
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complicated implementation is needed on top of this.
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GTK+ contains such an implementation in the functions
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in <literal>gtkselection.h</literal> and programmers
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should use those functions instead of the ones presented
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here. If you plan to implement selection handling
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directly on top of the functions here, you should refer
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to the X Inter-client Communication Conventions Manual
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(ICCCM).
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### TYPEDEF GdkSelection ##### -->
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<para>
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The #GdkSelection enumeration contains predefined
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atom values for several common selections.
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</para>
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<!-- ##### TYPEDEF GdkSelectionType ##### -->
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<para>
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The #GdkSelectionType enumeration contains predefined
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atom values used to represent the types of data transferred
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in response to a request for a target. See the
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ICCCM for details about what data should be transferred
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for each of these types. Other atoms can be used,
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and the recommended practice for GTK+ is to to use mime
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types for this purpose. However, supporting these types
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may be useful for compatibility with older programs.
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</para>
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<!-- ##### TYPEDEF GdkTarget ##### -->
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<para>
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The #GdkTarget enumeration contains predefined atom values which are
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used to describe possible targets for a selection. Other atoms can be
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used, and the recommended practice for GTK+ is to to use mime types
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for this purpose. However, supporting these types may be useful for
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compatibility with older programs.
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</para>
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<!-- ##### FUNCTION gdk_selection_owner_set ##### -->
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<para>
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Set the owner of the given selection.
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</para>
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@owner: a #GdkWindow or NULL to indicate that the
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the owner for the given should be unset.
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@selection: an atom identifying a selection.
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@time: timestamp to use when setting the selection.
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If this is older than the timestamp given last
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time the owner was set for the given selection, the
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request will be ignored.
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@send_event: if %TRUE, and the new owner is different
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from the current owner, the current owner
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will be sent a SelectionClear event.
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@Returns: %TRUE if the selection owner was succesfully
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changed to @owner, otherwise %FALSE.
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<!-- ##### FUNCTION gdk_selection_owner_get ##### -->
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<para>
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Determine the owner of the given selection.
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</para>
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@selection: an atom indentifying a selection.
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@Returns: if there is a selection owner for this window,
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and it is a window known to the current process,
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the #GdkWindow that owns the selection, otherwise
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NULL. Note that the return value may be owned
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by a different process if a foreign window
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was previously created for that window, but
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a new foreign window will never be created by
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this call.
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<!-- ##### FUNCTION gdk_selection_convert ##### -->
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<para>
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Retrieve the contents of a selection in a given
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form.
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</para>
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@requestor: a #GdkWindow.
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@selection: an atom identifying the selection to get the
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contents of.
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@target: the form in which to retrieve the selection.
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@time: the timestamp to use when retrieving the
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selection. The selection owner may refuse the
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request if it did not own the selection at
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the time indicated by the timestamp.
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<!-- ##### FUNCTION gdk_selection_property_get ##### -->
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<para>
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Retrieve selection data that was stored by the selection
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data in response to a call to gdk_selection_convert()
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</para>
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@requestor: the window on which the data is stored
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@data: location to store a pointer to the retrieved data.
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If the retrieval failed, NULL we be stored here, otherwise, it
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will be non-NULL and the returned data should be freed with g_free()
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when you are finished using it. The length of the
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allocated memory is one more than the the length
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of the returned data, and the final byte will always
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be zero, to ensure null-termination of strings.
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@prop_type: location to store the type of the property.
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@prop_format: location to store the format of the property.
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@Returns: the length of the retrieved data.
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<!-- ##### FUNCTION gdk_selection_send_notify ##### -->
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<para>
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Send a response to SelectionRequest event.
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</para>
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@requestor: window to which to deliver response.
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@selection: selection that was requested.
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@target: target that was selected.
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@property: property in which the selection owner stored the
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data, or %GDK_NONE to indicate that the request
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was rejected.
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@time: timestamp.
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