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128 lines
4.2 KiB
C
128 lines
4.2 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2000 Red Hat, Inc.
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* 2005 Imendio AB
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkproperty.h"
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#include "gdkinternals.h"
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/**
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* SECTION:properties
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* @Short_description: Functions to manipulate properties on windows
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* @Title: Properties and Atoms
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*
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* Each window under X can have any number of associated
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* “properties” attached to it.
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* Properties are arbitrary chunks of data identified by
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* “atom”s. (An “atom”
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* is a numeric index into a string table on the X server. They are used
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* to transfer strings efficiently between clients without
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* having to transfer the entire string.) A property
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* has an associated type, which is also identified
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* using an atom.
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*
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* A property has an associated “format”,
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* an integer describing how many bits are in each unit
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* of data inside the property. It must be 8, 16, or 32.
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* When data is transferred between the server and client,
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* if they are of different endianesses it will be byteswapped
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* as necessary according to the format of the property.
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* Note that on the client side, properties of format 32
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* will be stored with one unit per long,
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* even if a long integer has more than 32 bits on the platform.
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* (This decision was apparently made for Xlib to maintain
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* compatibility with programs that assumed longs were 32
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* bits, at the expense of programs that knew better.)
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*
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* The functions in this section are used to add, remove
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* and change properties on windows, to convert atoms
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* to and from strings and to manipulate some types of
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* data commonly stored in X window properties.
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*/
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/**
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* gdk_atom_intern:
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* @atom_name: a string.
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* @only_if_exists: if %TRUE, GDK is allowed to not create a new atom, but
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* just return %NULL if the requested atom doesn’t already
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* exists. Currently, the flag is ignored, since checking the
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* existance of an atom is as expensive as creating it.
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*
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* Finds or creates an atom corresponding to a given string.
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*
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* Returns: (transfer none): the atom corresponding to @atom_name.
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*/
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GdkAtom
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gdk_atom_intern (const gchar *atom_name,
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gboolean only_if_exists)
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{
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g_return_val_if_fail (atom_name != NULL, NULL);
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return g_intern_string (atom_name);
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}
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/**
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* gdk_atom_intern_static_string:
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* @atom_name: a static string
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*
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* Finds or creates an atom corresponding to a given string.
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*
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* Note that this function is identical to gdk_atom_intern() except
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* that if a new #GdkAtom is created the string itself is used rather
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* than a copy. This saves memory, but can only be used if the string
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* will always exist. It can be used with statically
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* allocated strings in the main program, but not with statically
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* allocated memory in dynamically loaded modules, if you expect to
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* ever unload the module again (e.g. do not use this function in
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* GTK+ theme engines).
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*
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* Returns: (transfer none): the atom corresponding to @atom_name
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*
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* Since: 2.10
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*/
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GdkAtom
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gdk_atom_intern_static_string (const gchar *atom_name)
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{
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g_return_val_if_fail (atom_name != NULL, NULL);
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return g_intern_static_string (atom_name);
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}
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/**
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* gdk_atom_name:
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* @atom: a #GdkAtom.
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*
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* Determines the string corresponding to an atom.
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*
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* Returns: a newly-allocated string containing the string
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* corresponding to @atom. When you are done with the
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* return value, you should free it using g_free().
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*/
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gchar *
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gdk_atom_name (GdkAtom atom)
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{
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return g_strdup (_gdk_atom_name_const (atom));
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}
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const gchar *
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_gdk_atom_name_const (GdkAtom atom)
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{
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return atom;
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}
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