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The selection mechanism provides the basis for different types of communication 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.
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.
GtkTargetEntry * gtk_target_entry_new (const gchar *target,guint flags,guint info);
Makes a new GtkTargetEntry structure.
target |
String identifier for target |
|
flags |
Set of flags, see GtkTargetFlags |
|
info |
an ID that will be passed back to the application |
GtkTargetEntry *
gtk_target_entry_copy (GtkTargetEntry *data);
Makes a copy of a GtkTargetEntry structure and its data.
void
gtk_target_entry_free (GtkTargetEntry *data);
Frees a GtkTargetEntry structure returned from
gtk_target_entry_new() or gtk_target_entry_copy().
GtkTargetList * gtk_target_list_new (const GtkTargetEntry *targets,guint ntargets);
Creates a new GtkTargetList from an array of GtkTargetEntry.
targets |
Pointer to an array of GtkTargetEntry. |
[array length=ntargets] |
ntargets |
number of entries in |
GtkTargetList *
gtk_target_list_ref (GtkTargetList *list);
Increases the reference count of a GtkTargetList by one.
void
gtk_target_list_unref (GtkTargetList *list);
Decreases the reference count of a GtkTargetList by one. If the resulting reference count is zero, frees the list.
void gtk_target_list_add (GtkTargetList *list,GdkAtom target,guint flags,guint info);
Appends another target to a GtkTargetList.
void gtk_target_list_add_table (GtkTargetList *list,const GtkTargetEntry *targets,guint ntargets);
Prepends a table of GtkTargetEntry to a target list.
list |
||
targets |
the table of GtkTargetEntry. |
[array length=ntargets] |
ntargets |
number of targets in the table |
void gtk_target_list_add_text_targets (GtkTargetList *list,guint info);
Appends the text targets supported by GtkSelection to
the target list. All targets are added with the same info
.
Since 2.6
void gtk_target_list_add_image_targets (GtkTargetList *list,guint info,gboolean writable);
Appends the image targets supported by GtkSelection to
the target list. All targets are added with the same info
.
list |
||
info |
an ID that will be passed back to the application |
|
writable |
whether to add only targets for which GTK+ knows how to convert a pixbuf into the format |
Since 2.6
void gtk_target_list_add_uri_targets (GtkTargetList *list,guint info);
Appends the URI targets supported by GtkSelection to
the target list. All targets are added with the same info
.
Since 2.6
void gtk_target_list_add_rich_text_targets (GtkTargetList *list,guint info,gboolean deserializable,GtkTextBuffer *buffer);
Appends the rich text targets registered with
gtk_text_buffer_register_serialize_format() or
gtk_text_buffer_register_deserialize_format() to the target list. All
targets are added with the same info
.
list |
||
info |
an ID that will be passed back to the application |
|
deserializable |
if |
|
buffer |
Since 2.10
void gtk_target_list_remove (GtkTargetList *list,GdkAtom target);
Removes a target from a target list.
gboolean gtk_target_list_find (GtkTargetList *list,GdkAtom target,guint *info);
Looks up a given target in a GtkTargetList.
list |
||
target |
an interned atom representing the target to search for |
|
info |
a pointer to the location to store
application info for target, or |
[out][allow-none] |
void gtk_target_table_free (GtkTargetEntry *targets,gint n_targets);
This function frees a target table as returned by
gtk_target_table_new_from_list()
targets |
a GtkTargetEntry array. |
[array length=n_targets] |
n_targets |
the number of entries in the array |
Since 2.10
GtkTargetEntry * gtk_target_table_new_from_list (GtkTargetList *list,gint *n_targets);
This function creates an GtkTargetEntry array that contains the
same targets as the passed list. The returned table is newly
allocated and should be freed using gtk_target_table_free() when no
longer needed.
Since 2.10
gboolean gtk_selection_owner_set (GtkWidget *widget,GdkAtom selection,guint32 time_);
Claims ownership of a given selection for a particular widget,
or, if widget
is NULL, release ownership of the selection.
gboolean gtk_selection_owner_set_for_display (GdkDisplay *display,GtkWidget *widget,GdkAtom selection,guint32 time_);
Claim ownership of a given selection for a particular widget, or,
if widget
is NULL, release ownership of the selection.
display |
the GdkDisplay where the selection is set |
|
widget |
[allow-none] | |
selection |
an interned atom representing the selection to claim. |
|
time_ |
timestamp with which to claim the selection |
Since 2.2
void gtk_selection_add_target (GtkWidget *widget,GdkAtom selection,GdkAtom target,guint info);
Appends a specified target to the list of supported targets for a given widget and selection.
void gtk_selection_add_targets (GtkWidget *widget,GdkAtom selection,const GtkTargetEntry *targets,guint ntargets);
Prepends a table of targets to the list of supported targets for a given widget and selection.
void gtk_selection_clear_targets (GtkWidget *widget,GdkAtom selection);
Remove all targets registered for the given selection for the widget.
gboolean gtk_selection_convert (GtkWidget *widget,GdkAtom selection,GdkAtom target,guint32 time_);
Requests the contents of a selection. When received, a "selection-received" signal will be generated.
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 |
void gtk_selection_data_set (GtkSelectionData *selection_data,GdkAtom type,gint format,const guchar *data,gint length);
Stores new data into a GtkSelectionData object. Should only be called from a selection handler callback. Zero-terminates the stored data.
selection_data |
a pointer to a GtkSelectionData structure. |
|
type |
the type of selection data |
|
format |
format (number of bits in a unit) |
|
data |
pointer to the data (will be copied). |
[array length=length] |
length |
length of the data |
gboolean gtk_selection_data_set_text (GtkSelectionData *selection_data,const gchar *str,gint len);
Sets the contents of the selection from a UTF-8 encoded string.
The string is converted to the form determined by
selection_data->target
.
guchar *
gtk_selection_data_get_text (const GtkSelectionData *selection_data);
Gets the contents of the selection data as a UTF-8 string.
gboolean gtk_selection_data_set_pixbuf (GtkSelectionData *selection_data,GdkPixbuf *pixbuf);
Sets the contents of the selection from a GdkPixbuf
The pixbuf is converted to the form determined by
selection_data->target
.
Since 2.6
GdkPixbuf *
gtk_selection_data_get_pixbuf (const GtkSelectionData *selection_data);
Gets the contents of the selection data as a GdkPixbuf.
if the selection data contained a recognized
image type and it could be converted to a GdkPixbuf, a
newly allocated pixbuf is returned, otherwise NULL.
If the result is non-NULL it must be freed with g_object_unref().
[transfer full]
Since 2.6
gboolean gtk_selection_data_set_uris (GtkSelectionData *selection_data,gchar **uris);
Sets the contents of the selection from a list of URIs.
The string is converted to the form determined by
selection_data->target
.
selection_data |
||
uris |
a |
[array zero-terminated=1] |
Since 2.6
gchar **
gtk_selection_data_get_uris (const GtkSelectionData *selection_data);
Gets the contents of the selection data as array of URIs.
if
the selection data contains a list of
URIs, a newly allocated NULL-terminated string array
containing the URIs, otherwise NULL. If the result is
non-NULL it must be freed with g_strfreev().
[array zero-terminated=1][element-type utf8][transfer full]
Since 2.6
gboolean gtk_selection_data_get_targets (const GtkSelectionData *selection_data,GdkAtom **targets,gint *n_atoms);
Gets the contents of selection_data
as an array of targets.
This can be used to interpret the results of getting
the standard TARGETS target that is always supplied for
any selection.
selection_data |
a GtkSelectionData object |
|
targets |
location to store an array of targets. The result stored
here must be freed with |
[out][array length=n_atoms][transfer container] |
n_atoms |
location to store number of items in |
gboolean gtk_selection_data_targets_include_image (const GtkSelectionData *selection_data,gboolean writable);
Given a GtkSelectionData object holding a list of targets,
determines if any of the targets in targets
can be used to
provide a GdkPixbuf.
selection_data |
a GtkSelectionData object |
|
writable |
whether to accept only targets for which GTK+ knows how to convert a pixbuf into the format |
TRUE if selection_data
holds a list of targets,
and a suitable target for images is included, otherwise FALSE.
Since 2.6
gboolean
gtk_selection_data_targets_include_text
(const GtkSelectionData *selection_data);
Given a GtkSelectionData object holding a list of targets,
determines if any of the targets in targets
can be used to
provide text.
gboolean
gtk_selection_data_targets_include_uri
(const GtkSelectionData *selection_data);
Given a GtkSelectionData object holding a list of targets,
determines if any of the targets in targets
can be used to
provide a list or URIs.
TRUE if selection_data
holds a list of targets,
and a suitable target for URI lists is included, otherwise FALSE.
Since 2.10
gboolean gtk_selection_data_targets_include_rich_text (const GtkSelectionData *selection_data,GtkTextBuffer *buffer);
Given a GtkSelectionData object holding a list of targets,
determines if any of the targets in targets
can be used to
provide rich text.
TRUE if selection_data
holds a list of targets,
and a suitable target for rich text is included,
otherwise FALSE.
Since 2.10
GdkAtom
gtk_selection_data_get_selection (const GtkSelectionData *selection_data);
Retrieves the selection GdkAtom of the selection data.
Since 2.16
const guchar *
gtk_selection_data_get_data (const GtkSelectionData *selection_data);
Retrieves the raw data of the selection.
Since 2.14
gint
gtk_selection_data_get_length (const GtkSelectionData *selection_data);
Retrieves the length of the raw data of the selection.
Since 2.14
const guchar * gtk_selection_data_get_data_with_length (const GtkSelectionData *selection_data,gint *length);
Retrieves the raw data of the selection along with its length.
selection_data |
a pointer to a GtkSelectionData structure |
|
length |
return location for length of the data segment. |
[out] |
Since 3.0
GdkAtom
gtk_selection_data_get_data_type (const GtkSelectionData *selection_data);
Retrieves the data type of the selection.
Since 2.14
GdkDisplay *
gtk_selection_data_get_display (const GtkSelectionData *selection_data);
Retrieves the display of the selection.
Since 2.14
gint
gtk_selection_data_get_format (const GtkSelectionData *selection_data);
Retrieves the format of the selection.
Since 2.14
GdkAtom
gtk_selection_data_get_target (const GtkSelectionData *selection_data);
Retrieves the target of the selection.
Since 2.14
gboolean gtk_targets_include_image (GdkAtom *targets,gint n_targets,gboolean writable);
Determines if any of the targets in targets
can be used to
provide a GdkPixbuf.
targets |
an array of GdkAtoms. |
[array length=n_targets] |
n_targets |
the length of |
|
writable |
whether to accept only targets for which GTK+ knows how to convert a pixbuf into the format |
Since 2.10
gboolean gtk_targets_include_text (GdkAtom *targets,gint n_targets);
Determines if any of the targets in targets
can be used to
provide text.
Since 2.10
gboolean gtk_targets_include_uri (GdkAtom *targets,gint n_targets);
Determines if any of the targets in targets
can be used to
provide an uri list.
Since 2.10
gboolean gtk_targets_include_rich_text (GdkAtom *targets,gint n_targets,GtkTextBuffer *buffer);
Determines if any of the targets in targets
can be used to
provide rich text.
targets |
an array of GdkAtoms. |
[array length=n_targets] |
n_targets |
the length of |
|
buffer |
Since 2.10
void
gtk_selection_remove_all (GtkWidget *widget);
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.
GtkSelectionData *
gtk_selection_data_copy (const GtkSelectionData *data);
Makes a copy of a GtkSelectionData structure and its data.
void
gtk_selection_data_free (GtkSelectionData *data);
Frees a GtkSelectionData structure returned from
gtk_selection_data_copy().
typedef struct {
GdkAtom selection;
GdkAtom target;
GdkAtom type;
gint format;
guchar *data;
gint length;
GdkDisplay *display;
} GtkSelectionData;
struct GtkTargetEntry {
gchar *target;
guint flags;
guint info;
};
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.
gchar * |
a string representation of the target type |
|
guint |
GtkTargetFlags for DND |
|
guint |
an application-assigned integer ID which will get passed as a parameter to e.g the “selection-get” signal. It allows the application to identify the target type without extensive string compares. |
typedef struct {
GList *list;
guint ref_count;
};
typedef struct _GtkTargetPair GtkTargetPair;
struct _GtkTargetPair
{
GdkAtom target;
guint flags;
guint info;
} GtkTargetList;
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.
GtkWidget - 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