path: root/docs/reference/gtk/tmpl/gtkselection.sgml

<!-- ##### SECTION Title ##### -->
Selections

<!-- ##### SECTION Short_Description ##### -->
Functions for handling inter-process communication via selections.

<!-- ##### SECTION Long_Description ##### -->

<para>
The selection mechanism provides the basis for different types
of IPC between processes. In particular, drag and drop and
#GtkClipboard work via selections. You will very seldom or
never need to use most of the functions in this section directly;
#GtkClipboard provides a nicer interface to the same functionality.
</para>
<para>
Some of the datatypes defined this section are used in
the #GtkClipboard and drag-and-drop API's as well. The
#GtkTargetEntry structure and #GtkTargetList objects represent
lists of data types that are supported when sending or
receiving data. The #GtkSelectionData object is used to
store a chunk of data along with the data type and other
associated information.
</para>

<!-- ##### SECTION See_Also ##### -->
<para>
<variablelist>

<varlistentry>
<term>#GtkWidget</term>
<listitem><para>Much of the operation of selections happens via
             signals for #GtkWidget. In particular, if you are
             using the functions in this section, you may need
             to pay attention to ::selection_get,
             ::selection_received,  and :selection_clear_event
             signals.</para></listitem>
</varlistentry>

</variablelist>

</para>

<!-- ##### STRUCT GtkTargetEntry ##### -->
<para>
A #GtkTargetEntry structure represents a single type of
data than can be supplied for by a widget for a selection
or for supplied or received during drag-and-drop. It 
contains a string representing the drag type, a flags
field (used only for drag and drop - see #GtkTargetFlags),
and an application assigned integer ID. The integer
ID will later be passed as a signal parameter for signals
like "selection_get". It allows the application to identify
the target type without extensive string compares.
</para>

@target: 
@flags: 
@info: 

<!-- ##### STRUCT GtkTargetList ##### -->
<para>
A #GtkTargetList structure is a reference counted list
of #GtkTargetPair. It is used to represent the same
information as a table of #GtkTargetEntry, but in
an efficient form. This structure should be treated as
opaque.
</para>

@list: 
@ref_count: 

<!-- ##### STRUCT GtkTargetPair ##### -->
<para>
Internally used structure in the drag-and-drop and 
selection handling code.
</para>

@target: 
@flags: 
@info: 

<!-- ##### FUNCTION gtk_target_list_new ##### -->
<para>
Create a new #GtkTargetList from an array of #GtkTargetEntry.
</para>

@targets: Pointer to an array of #GtkTargetEntry
@ntargets: number of entries in @targets.
@Returns: the new #GtkTargetList.


<!-- ##### FUNCTION gtk_target_list_ref ##### -->
<para>
Increase the reference count of a #GtkTargetList by one.
</para>

@list: a #GtkTargetList


<!-- ##### FUNCTION gtk_target_list_unref ##### -->
<para>
Decrease the reference count of a #GtkTargetList by one.
If the resulting reference count is zero, free the list.
</para>

@list: a #GtkTargetList


<!-- ##### FUNCTION gtk_target_list_add ##### -->
<para>
Add another target to a #GtkTargetList
</para>

@list: a #GtkTargetList
@target: the interned atom representing the target
@flags: the flags for this target
@info: an ID that will be passed back to the application


<!-- ##### FUNCTION gtk_target_list_add_table ##### -->
<para>
Add a table of #GtkTargetEntry into a target list
</para>

@list: a #GtkTargetList
@targets: the table of #GtkTargetEntry
@ntargets: number of targets in the table


<!-- ##### FUNCTION gtk_target_list_remove ##### -->
<para>
Remove a target from a target list
</para>

@list: a #GtkTargetList
@target: the interned atom representing the target


<!-- ##### FUNCTION gtk_target_list_find ##### -->
<para>
Look up a given target in a #GtkTargetList
</para>

@list: a #GtkTargetList
@target: an interned atom representing the target to search for
@info: a pointer to the location to store application info for target
@Returns: %TRUE if the target was found, otherwise %FALSE


<!-- ##### FUNCTION gtk_selection_owner_set ##### -->
<para>
Claim ownership of a given selection for a particular widget,
or, if @widget is %NULL, release ownership of the selection.
</para>

@widget: a #GtkWidget, or %NULL.
@selection: an interned atom representing the selection to claim
@time: the time stamp for claiming the selection
@Returns: %TRUE if the operation succeeded


<!-- ##### FUNCTION gtk_selection_add_target ##### -->
<para>
Add specified target to the list of supported targets for a 
given widget and selection.
</para>

@widget: a #GtkTarget
@selection: the selection
@target: target to add.
@info: A unsigned integer which will be passed back to the application.


<!-- ##### FUNCTION gtk_selection_add_targets ##### -->
<para>
Add a table of targets to the list of supported targets
for a given widget and selection.
</para>

@widget: a #GtkWidget
@selection: the selection
@targets: a table of targets to add
@ntargets: number of entries in @targets


<!-- ##### FUNCTION gtk_selection_clear_targets ##### -->
<para>

</para>

@widget: 
@selection: 


<!-- ##### FUNCTION gtk_selection_convert ##### -->
<para>
Request the contents of a selection. When received, 
a "selection_received" signal will be generated.
</para>

@widget: The widget which acts as requestor
@selection: Which selection to get
@target: Form of information desired (e.g., STRING)
@time: Time of request (usually of triggering event)
       In emergency, you could use GDK_CURRENT_TIME
@Returns: TRUE if requested succeeded. FALSE if we could not process
          request. (e.g., there was already a request in process for
          this widget).


<!-- ##### FUNCTION gtk_selection_data_set ##### -->
<para>
Store new data into a GtkSelectionData object. Should
_only_ by called from a selection handler callback.
Null terminates the stored data.
</para>

@selection_data: 
@type: the type of selection data
@format: format (number of bits in a unit)
@data: pointer to the data (will be copied)
@length: length of the data


<!-- ##### FUNCTION gtk_selection_data_set_text ##### -->
<para>

</para>

@selection_data: 
@str: 
@len: 
@Returns: 


<!-- ##### FUNCTION gtk_selection_data_get_text ##### -->
<para>

</para>

@selection_data: 
@Returns: 


<!-- ##### FUNCTION gtk_selection_data_get_targets ##### -->
<para>

</para>

@selection_data: 
@targets: 
@n_atoms: 
@Returns: 


<!-- ##### FUNCTION gtk_selection_data_targets_include_text ##### -->
<para>

</para>

@selection_data: 
@Returns: 


<!-- ##### FUNCTION gtk_selection_remove_all ##### -->
<para>
Removes all handlers and unsets ownership of all 
selections for a widget. Called when widget is being
destroyed. This function will not generally be
called by applications.
</para>

@widget: a #GtkWidget


<!-- ##### FUNCTION gtk_selection_data_copy ##### -->
<para>
Make a copy of a #GtkSelection data structure and its
data.
</para>

@data: a pointer to a #GtkSelectionData structure.
@Returns: a pointer to a copy of @data.


<!-- ##### FUNCTION gtk_selection_data_free ##### -->
<para>
Free a #GtkSelectionData structure returned from
gtk_selection_data_copy().
</para>

@data: a pointer to a #GtkSelectionData structure.


<!-- ##### FUNCTION gtk_selection_clear ##### -->
<para>
Internal function.
</para>

@widget: 
@event: 
@Returns: 


<!-- ##### FUNCTION gtk_selection_incr_event ##### -->
<para>
Internal function.
</para>

@window: 
@event: 
@Returns: 


<!-- ##### FUNCTION gtk_selection_notify ##### -->
<para>
Internal function.
</para>

@widget: 
@event: 
@Returns: 


<!-- ##### FUNCTION gtk_selection_property_notify ##### -->
<para>
Internal function.
</para>

@widget: 
@event: 
@Returns: 


<!-- ##### FUNCTION gtk_selection_request ##### -->
<para>
Internal function.
</para>

@widget: 
@event: 
@Returns: