GDK Reference Manual
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Selections

Name

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 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 succesfully changed to owner, otherwise FALSE.

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.

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().

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 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.



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