Selections

## Selections Selections — Functions for transfering data via the X selection mechanism |

## Synopsis

    #include <gdk/gdk.h>

    typedef     GdkSelection;
    typedef     GdkSelectionType;
    typedef     GdkTarget;
    #define     GDK_SELECTION_PRIMARY
    #define     GDK_SELECTION_SECONDARY
    #define     GDK_SELECTION_CLIPBOARD
    #define     GDK_TARGET_BITMAP
    #define     GDK_TARGET_COLORMAP
    #define     GDK_TARGET_DRAWABLE
    #define     GDK_TARGET_PIXMAP
    #define     GDK_TARGET_STRING
    #define     GDK_SELECTION_TYPE_ATOM
    #define     GDK_SELECTION_TYPE_BITMAP
    #define     GDK_SELECTION_TYPE_COLORMAP
    #define     GDK_SELECTION_TYPE_DRAWABLE
    #define     GDK_SELECTION_TYPE_INTEGER
    #define     GDK_SELECTION_TYPE_PIXMAP
    #define     GDK_SELECTION_TYPE_WINDOW
    #define     GDK_SELECTION_TYPE_STRING
    gboolean    gdk_selection_owner_set         (GdkWindow *owner,
                                                 GdkAtom selection,
                                                 guint32 time_,
                                                 gboolean send_event);
    gboolean    gdk_selection_owner_set_for_display
                                                (GdkDisplay *display,
                                                 GdkWindow *owner,
                                                 GdkAtom selection,
                                                 guint32 time_,
                                                 gboolean send_event);
    GdkWindow*  gdk_selection_owner_get         (GdkAtom selection);
    GdkWindow*  gdk_selection_owner_get_for_display
                                                (GdkDisplay *display,
                                                 GdkAtom selection);
    void        gdk_selection_convert           (GdkWindow *requestor,
                                                 GdkAtom selection,
                                                 GdkAtom target,
                                                 guint32 time_);
    gboolean    gdk_selection_property_get      (GdkWindow *requestor,
                                                 guchar **data,
                                                 GdkAtom *prop_type,
                                                 gint *prop_format);
    void        gdk_selection_send_notify       (guint32 requestor,
                                                 GdkAtom selection,
                                                 GdkAtom target,
                                                 GdkAtom property,
                                                 guint32 time_);
    void        gdk_selection_send_notify_for_display
                                                (GdkDisplay *display,
                                                 guint32 requestor,
                                                 GdkAtom selection,
                                                 GdkAtom target,
                                                 GdkAtom property,
                                                 guint32 time_);

## Description

The X selection mechanism provides a way to transfer arbitrary chunks of data between programs. A selection is a essentially a named clipboard, identified by a string interned as a GdkAtom. By claiming ownership of a selection, an application indicates that it will be responsible for supplying its contents. The most common selections are `PRIMARY` and `CLIPBOARD`.

The contents of a selection can be represented in a number of formats, called targets. Each target is identified by an atom. A list of all possible targets supported by the selection owner can be retrieved by requesting the special target `TARGETS`. When a selection is retrieved, the data is accompanied by a type (an atom), and a format (an integer, representing the number of bits per item). See Properties and Atoms for more information.

The functions in this section only contain the lowlevel parts of the selection protocol. A considerably more complicated implementation is needed on top of this. GTK+ contains such an implementation in the functions in `gtkselection.h` and programmers should use those functions instead of the ones presented here. If you plan to implement selection handling directly on top of the functions here, you should refer to the X Inter-client Communication Conventions Manual (ICCCM).

## Details

### GdkSelection

    typedef GdkAtom GdkSelection;

### Warning

`GdkSelection` is deprecated and should not be used in newly-written code.

The GdkSelection enumeration contains predefined atom values for several common selections.

### GdkSelectionType

    typedef GdkAtom GdkSelectionType;

### Warning

`GdkSelectionType` is deprecated and should not be used in newly-written code.

The GdkSelectionType enumeration contains predefined atom values used to represent the types of data transferred in response to a request for a target. See the ICCCM for details about what data should be transferred for each of these types. Other atoms can be used, and the recommended practice for GTK+ is to to use mime types for this purpose. However, supporting these types may be useful for compatibility with older programs.

### GdkTarget

    typedef GdkAtom GdkTarget;

### Warning

`GdkTarget` is deprecated and should not be used in newly-written code.

The GdkTarget enumeration contains predefined atom values which are used to describe possible targets for a selection. Other atoms can be used, and the recommended practice for GTK+ is to to use mime types for this purpose. However, supporting these types may be useful for compatibility with older programs.

### GDK_SELECTION_PRIMARY

    #define GDK_SELECTION_PRIMARY 		_GDK_MAKE_ATOM (1)

A GdkAtom representing the `PRIMARY` selection.

### GDK_SELECTION_SECONDARY

    #define GDK_SELECTION_SECONDARY 	_GDK_MAKE_ATOM (2)

A GdkAtom representing the `SECONDARY` selection.

### GDK_SELECTION_CLIPBOARD

    #define GDK_SELECTION_CLIPBOARD 	_GDK_MAKE_ATOM (69)

A GdkAtom representing the `CLIPBOARD` selection.

### GDK_TARGET_BITMAP

    #define GDK_TARGET_BITMAP 		_GDK_MAKE_ATOM (5)

A GdkAtom representing the `BITMAP` selection target.

### GDK_TARGET_COLORMAP

    #define GDK_TARGET_COLORMAP 		_GDK_MAKE_ATOM (7)

A GdkAtom representing the `COLORMAP` selection target.

### GDK_TARGET_DRAWABLE

    #define GDK_TARGET_DRAWABLE 		_GDK_MAKE_ATOM (17)

A GdkAtom representing the `DRAWABLE` selection target.

### GDK_TARGET_PIXMAP

    #define GDK_TARGET_PIXMAP 		_GDK_MAKE_ATOM (20)

A GdkAtom representing the `PIXMAP` selection target.

### GDK_TARGET_STRING

    #define GDK_TARGET_STRING 		_GDK_MAKE_ATOM (31)

A GdkAtom representing the `STRING` selection target.

### GDK_SELECTION_TYPE_ATOM

    #define GDK_SELECTION_TYPE_ATOM 	_GDK_MAKE_ATOM (4)

A GdkAtom representing the `ATOM` selection type.

### GDK_SELECTION_TYPE_BITMAP

    #define GDK_SELECTION_TYPE_BITMAP 	_GDK_MAKE_ATOM (5)

A GdkAtom representing the `BITMAP` selection type.

### GDK_SELECTION_TYPE_COLORMAP

    #define GDK_SELECTION_TYPE_COLORMAP 	_GDK_MAKE_ATOM (7)

A GdkAtom representing the `COLORMAP` selection type.

### GDK_SELECTION_TYPE_DRAWABLE

    #define GDK_SELECTION_TYPE_DRAWABLE 	_GDK_MAKE_ATOM (17)

A GdkAtom representing the `DRAWABLE` selection type.

### GDK_SELECTION_TYPE_INTEGER

    #define GDK_SELECTION_TYPE_INTEGER 	_GDK_MAKE_ATOM (19)

A GdkAtom representing the `INTEGER` selection type.

### GDK_SELECTION_TYPE_PIXMAP

    #define GDK_SELECTION_TYPE_PIXMAP 	_GDK_MAKE_ATOM (20)

A GdkAtom representing the `PIXMAP` selection type.

### GDK_SELECTION_TYPE_WINDOW

    #define GDK_SELECTION_TYPE_WINDOW 	_GDK_MAKE_ATOM (33)

A GdkAtom representing the `WINDOW` selection type.

### GDK_SELECTION_TYPE_STRING

    #define GDK_SELECTION_TYPE_STRING 	_GDK_MAKE_ATOM (31)

A GdkAtom representing the `STRING` selection type.

### gdk_selection_owner_set ()

    gboolean    gdk_selection_owner_set         (GdkWindow *owner,
                                                 GdkAtom selection,
                                                 guint32 time_,
                                                 gboolean send_event);

Sets the owner of the given selection.

`owner` : | a GdkWindow or `NULL` to indicate that the the owner for the given should be unset.
`selection` : | an atom identifying a selection.
`time_` : | timestamp to use when setting the selection. If this is older than the timestamp given last time the owner was set for the given selection, the request will be ignored.
`send_event` : | if `TRUE`, and the new owner is different from the current owner, the current owner will be sent a SelectionClear event.
Returns : | `TRUE` if the selection owner was successfully changed to `owner`, otherwise `FALSE`.

### gdk_selection_owner_set_for_display ()

    gboolean    gdk_selection_owner_set_for_display
                                                (GdkDisplay *display,
                                                 GdkWindow *owner,
                                                 GdkAtom selection,
                                                 guint32 time_,
                                                 gboolean send_event);

Sets the GdkWindow `owner` as the current owner of the selection `selection`.

`display` : | the GdkDisplay.
`owner` : | a GdkWindow or `NULL` to indicate that the owner for the given should be unset.
`selection` : | an atom identifying a selection.
`time_` : | timestamp to use when setting the selection. If this is older than the timestamp given last time the owner was set for the given selection, the request will be ignored.
`send_event` : | if `TRUE`, and the new owner is different from the current owner, the current owner will be sent a SelectionClear event.
Returns : | `TRUE` if the selection owner was successfully changed to owner, otherwise `FALSE`.

Since 2.2

### gdk_selection_owner_get ()

    GdkWindow*  gdk_selection_owner_get         (GdkAtom selection);

Determines the owner of the given selection.

`selection` : | an atom indentifying a selection.
Returns : | if there is a selection owner for this window, and it is a window known to the current process, the GdkWindow that owns the selection, otherwise `NULL`. Note that the return value may be owned by a different process if a foreign window was previously created for that window, but a new foreign window will never be created by this call.

### gdk_selection_owner_get_for_display ()

    GdkWindow*  gdk_selection_owner_get_for_display
                                                (GdkDisplay *display,
                                                 GdkAtom selection);

Determine the owner of the given selection.

Note that the return value may be owned by a different process if a foreign window was previously created for that window, but a new foreign window will never be created by this call.

`display` : | a GdkDisplay.
`selection` : | an atom indentifying a selection.
Returns : | if there is a selection owner for this window, and it is a window known to the current process, the GdkWindow that owns the selection, otherwise `NULL`.

Since 2.2

### gdk_selection_convert ()

    void        gdk_selection_convert           (GdkWindow *requestor,
                                                 GdkAtom selection,
                                                 GdkAtom target,
                                                 guint32 time_);

Retrieves the contents of a selection in a given form.

`requestor` : | a GdkWindow.
`selection` : | an atom identifying the selection to get the contents of.
`target` : | the form in which to retrieve the selection.
`time_` : | the timestamp to use when retrieving the selection. The selection owner may refuse the request if it did not own the selection at the time indicated by the timestamp.

### gdk_selection_property_get ()

    gboolean    gdk_selection_property_get      (GdkWindow *requestor,
                                                 guchar **data,
                                                 GdkAtom *prop_type,
                                                 gint *prop_format);

Retrieves selection data that was stored by the selection data in response to a call to `gdk_selection_convert()`. This function will not be used by applications, who should use the GtkClipboard API instead.

`requestor` : | the window on which the data is stored
`data` : | location to store a pointer to the retrieved data. If the retrieval failed, `NULL` we be stored here, otherwise, it will be non-`NULL` and the returned data should be freed with `g_free()` when you are finished using it. The length of the allocated memory is one more than the length of the returned data, and the final byte will always be zero, to ensure nul-termination of strings.
`prop_type` : | location to store the type of the property.
`prop_format` : | location to store the format of the property.
Returns : | the length of the retrieved data.

### gdk_selection_send_notify ()

    void        gdk_selection_send_notify       (guint32 requestor,
                                                 GdkAtom selection,
                                                 GdkAtom target,
                                                 GdkAtom property,
                                                 guint32 time_);

Sends a response to SelectionRequest event.

`requestor` : | window to which to deliver response.
`selection` : | selection that was requested.
`target` : | target that was selected.
`property` : | property in which the selection owner stored the data, or `GDK_NONE` to indicate that the request was rejected.
`time_` : | timestamp.

### gdk_selection_send_notify_for_display ()

    void        gdk_selection_send_notify_for_display
                                                (GdkDisplay *display,
                                                 guint32 requestor,
                                                 GdkAtom selection,
                                                 GdkAtom target,
                                                 GdkAtom property,
                                                 guint32 time_);

Send a response to SelectionRequest event.

`display` : | the GdkDisplay where `requestor` is realized
`requestor` : | window to which to deliver response.
`selection` : | selection that was requested.
`target` : | target that was selected.
`property` : | property in which the selection owner stored the data, or `GDK_NONE` to indicate that the request was rejected.
`time_` : | timestamp.

Since 2.2