forked from AuroraMiddleware/gtk
a1c297a310
This change does not introduce any functionality change, mostly cosmtic cleanups, like re-linebreak when introduced annotations messed up indentation or whitespace errors fixes.
625 lines
21 KiB
C
625 lines
21 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 2000 Red Hat, Inc.
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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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include "gdkkeysprivate.h"
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#include "gdkdisplay.h"
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#include "gdkdisplaymanagerprivate.h"
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/**
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* SECTION:keys
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* @Short_description: Functions for manipulating keyboard codes
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* @Title: Key Values
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*
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* Key values are the codes which are sent whenever a key is pressed or released.
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* They appear in the #GdkEventKey.keyval field of the
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* #GdkEventKey structure, which is passed to signal handlers for the
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* #GtkWidget::key-press-event and #GtkWidget::key-release-event signals.
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* The complete list of key values can be found in the
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* <filename><gdk/gdkkeysyms.h></filename> header file.
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*
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* Key values are regularly updated from the upstream X.org X11 implementation,
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* so new values are added regularly. They will be prefixed with GDK_KEY_ rather
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* than XF86XK_ or XK_ (for older symbols).
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*
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* Key values can be converted into a string representation using
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* gdk_keyval_name(). The reverse function, converting a string to a key value,
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* is provided by gdk_keyval_from_name().
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*
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* The case of key values can be determined using gdk_keyval_is_upper() and
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* gdk_keyval_is_lower(). Key values can be converted to upper or lower case
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* using gdk_keyval_to_upper() and gdk_keyval_to_lower().
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*
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* When it makes sense, key values can be converted to and from
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* Unicode characters with gdk_keyval_to_unicode() and gdk_unicode_to_keyval().
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*
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* <para id="key-group-explanation">
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* One #GdkKeymap object exists for each user display. gdk_keymap_get_default()
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* returns the #GdkKeymap for the default display; to obtain keymaps for other
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* displays, use gdk_keymap_get_for_display(). A keymap
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* is a mapping from #GdkKeymapKey to key values. You can think of a #GdkKeymapKey
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* as a representation of a symbol printed on a physical keyboard key. That is, it
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* contains three pieces of information. First, it contains the hardware keycode;
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* this is an identifying number for a physical key. Second, it contains the
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* <firstterm>level</firstterm> of the key. The level indicates which symbol on the
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* key will be used, in a vertical direction. So on a standard US keyboard, the key
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* with the number "1" on it also has the exclamation point ("!") character on
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* it. The level indicates whether to use the "1" or the "!" symbol. The letter
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* keys are considered to have a lowercase letter at level 0, and an uppercase
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* letter at level 1, though only the uppercase letter is printed. Third, the
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* #GdkKeymapKey contains a group; groups are not used on standard US keyboards,
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* but are used in many other countries. On a keyboard with groups, there can be 3
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* or 4 symbols printed on a single key. The group indicates movement in a
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* horizontal direction. Usually groups are used for two different languages. In
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* group 0, a key might have two English characters, and in group 1 it might have
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* two Hebrew characters. The Hebrew characters will be printed on the key next to
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* the English characters.
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* </para>
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*
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* In order to use a keymap to interpret a key event, it's necessary to first
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* convert the keyboard state into an effective group and level. This is done via a
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* set of rules that varies widely according to type of keyboard and user
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* configuration. The function gdk_keymap_translate_keyboard_state() accepts a
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* keyboard state -- consisting of hardware keycode pressed, active modifiers, and
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* active group -- applies the appropriate rules, and returns the group/level to be
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* used to index the keymap, along with the modifiers which did not affect the
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* group and level. i.e. it returns "unconsumed modifiers." The keyboard group may
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* differ from the effective group used for keymap lookups because some keys don't
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* have multiple groups - e.g. the Enter key is always in group 0 regardless of
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* keyboard state.
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*
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* Note that gdk_keymap_translate_keyboard_state() also returns the keyval, i.e. it
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* goes ahead and performs the keymap lookup in addition to telling you which
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* effective group/level values were used for the lookup. #GdkEventKey already
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* contains this keyval, however, so you don't normally need to call
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* gdk_keymap_translate_keyboard_state() just to get the keyval.
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*/
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enum {
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DIRECTION_CHANGED,
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KEYS_CHANGED,
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STATE_CHANGED,
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LAST_SIGNAL
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};
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static guint signals[LAST_SIGNAL] = { 0 };
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G_DEFINE_TYPE (GdkKeymap, gdk_keymap, G_TYPE_OBJECT)
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static void
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gdk_keymap_class_init (GdkKeymapClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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/**
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* GdkKeymap::direction-changed:
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* @keymap: the object on which the signal is emitted
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*
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* The ::direction-changed signal gets emitted when the direction of
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* the keymap changes.
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*
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* Since: 2.0
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*/
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signals[DIRECTION_CHANGED] =
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g_signal_new ("direction-changed",
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G_OBJECT_CLASS_TYPE (object_class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GdkKeymapClass, direction_changed),
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NULL, NULL,
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g_cclosure_marshal_VOID__VOID,
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G_TYPE_NONE,
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0);
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/**
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* GdkKeymap::keys-changed:
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* @keymap: the object on which the signal is emitted
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*
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* The ::keys-changed signal is emitted when the mapping represented by
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* @keymap changes.
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*
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* Since: 2.2
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*/
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signals[KEYS_CHANGED] =
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g_signal_new ("keys-changed",
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G_OBJECT_CLASS_TYPE (object_class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GdkKeymapClass, keys_changed),
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NULL, NULL,
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g_cclosure_marshal_VOID__VOID,
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G_TYPE_NONE,
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0);
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/**
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* GdkKeymap::state-changed:
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* @keymap: the object on which the signal is emitted
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*
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* The ::state-changed signal is emitted when the state of the
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* keyboard changes, e.g when Caps Lock is turned on or off.
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* See gdk_keymap_get_caps_lock_state().
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*
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* Since: 2.16
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*/
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signals[STATE_CHANGED] =
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g_signal_new ("state_changed",
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G_OBJECT_CLASS_TYPE (object_class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GdkKeymapClass, state_changed),
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NULL, NULL,
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g_cclosure_marshal_VOID__VOID,
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G_TYPE_NONE,
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0);
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}
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static void
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gdk_keymap_init (GdkKeymap *keymap)
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{
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}
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/* Other key-handling stuff
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*/
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/**
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* gdk_keyval_convert_case:
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* @symbol: a keyval
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* @lower: (out): return location for lowercase version of @symbol
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* @upper: (out): return location for uppercase version of @symbol
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*
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* Obtains the upper- and lower-case versions of the keyval @symbol.
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* Examples of keyvals are #GDK_KEY_a, #GDK_KEY_Enter, #GDK_KEY_F1, etc.
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*/
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void
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gdk_keyval_convert_case (guint symbol,
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guint *lower,
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guint *upper)
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{
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GdkDisplayManager *manager = gdk_display_manager_get ();
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GDK_DISPLAY_MANAGER_GET_CLASS (manager)->keyval_convert_case (manager, symbol, lower, upper);
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}
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/**
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* gdk_keyval_to_upper:
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* @keyval: a key value.
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*
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* Converts a key value to upper case, if applicable.
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*
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* Returns: the upper case form of @keyval, or @keyval itself if it is already
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* in upper case or it is not subject to case conversion.
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*/
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guint
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gdk_keyval_to_upper (guint keyval)
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{
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guint result;
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gdk_keyval_convert_case (keyval, NULL, &result);
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return result;
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}
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/**
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* gdk_keyval_to_lower:
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* @keyval: a key value.
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*
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* Converts a key value to lower case, if applicable.
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*
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* Returns: the lower case form of @keyval, or @keyval itself if it is already
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* in lower case or it is not subject to case conversion.
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*/
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guint
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gdk_keyval_to_lower (guint keyval)
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{
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guint result;
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gdk_keyval_convert_case (keyval, &result, NULL);
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return result;
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}
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/**
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* gdk_keyval_is_upper:
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* @keyval: a key value.
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*
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* Returns %TRUE if the given key value is in upper case.
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*
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* Returns: %TRUE if @keyval is in upper case, or if @keyval is not subject to
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* case conversion.
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*/
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gboolean
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gdk_keyval_is_upper (guint keyval)
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{
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if (keyval)
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{
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guint upper_val = 0;
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gdk_keyval_convert_case (keyval, NULL, &upper_val);
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return upper_val == keyval;
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}
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return FALSE;
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}
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/**
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* gdk_keyval_is_lower:
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* @keyval: a key value.
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*
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* Returns %TRUE if the given key value is in lower case.
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*
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* Returns: %TRUE if @keyval is in lower case, or if @keyval is not
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* subject to case conversion.
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*/
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gboolean
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gdk_keyval_is_lower (guint keyval)
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{
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if (keyval)
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{
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guint lower_val = 0;
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gdk_keyval_convert_case (keyval, &lower_val, NULL);
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return lower_val == keyval;
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}
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return FALSE;
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}
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/**
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* gdk_keymap_get_default:
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*
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* Returns the #GdkKeymap attached to the default display.
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*
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* Returns: (transfer none): the #GdkKeymap attached to the default display.
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*/
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GdkKeymap*
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gdk_keymap_get_default (void)
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{
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return gdk_keymap_get_for_display (gdk_display_get_default ());
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}
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/**
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* gdk_keymap_get_direction:
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* @keymap: a #GdkKeymap
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*
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* Returns the direction of effective layout of the keymap.
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*
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* Returns: %PANGO_DIRECTION_LTR or %PANGO_DIRECTION_RTL
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* if it can determine the direction. %PANGO_DIRECTION_NEUTRAL
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* otherwise.
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**/
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PangoDirection
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gdk_keymap_get_direction (GdkKeymap *keymap)
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{
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return GDK_KEYMAP_GET_CLASS(keymap)->get_direction (keymap);
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}
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/**
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* gdk_keymap_have_bidi_layouts:
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* @keymap: a #GdkKeymap
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*
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* Determines if keyboard layouts for both right-to-left and left-to-right
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* languages are in use.
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*
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* Returns: %TRUE if there are layouts in both directions, %FALSE otherwise
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*
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* Since: 2.12
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**/
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gboolean
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gdk_keymap_have_bidi_layouts (GdkKeymap *keymap)
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{
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return GDK_KEYMAP_GET_CLASS(keymap)->have_bidi_layouts (keymap);
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}
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/**
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* gdk_keymap_get_caps_lock_state:
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* @keymap: a #GdkKeymap
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*
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* Returns whether the Caps Lock modifer is locked.
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*
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* Returns: %TRUE if Caps Lock is on
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*
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* Since: 2.16
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*/
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gboolean
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gdk_keymap_get_caps_lock_state (GdkKeymap *keymap)
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{
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return GDK_KEYMAP_GET_CLASS(keymap)->get_caps_lock_state (keymap);
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}
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/**
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* gdk_keymap_get_num_lock_state:
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* @keymap: a #GdkKeymap
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*
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* Returns whether the Num Lock modifer is locked.
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*
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* Returns: %TRUE if Num Lock is on
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*
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* Since: 3.0
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*/
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gboolean
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gdk_keymap_get_num_lock_state (GdkKeymap *keymap)
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{
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return GDK_KEYMAP_GET_CLASS(keymap)->get_num_lock_state (keymap);
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}
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/**
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* gdk_keymap_get_entries_for_keyval:
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* @keymap: a #GdkKeymap
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* @keyval: a keyval, such as %GDK_a, %GDK_Up, %GDK_Return, etc.
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* @keys: (out): return location for an array of #GdkKeymapKey
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* @n_keys: (out): return location for number of elements in returned array
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*
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* Obtains a list of keycode/group/level combinations that will
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* generate @keyval. Groups and levels are two kinds of keyboard mode;
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* in general, the level determines whether the top or bottom symbol
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* on a key is used, and the group determines whether the left or
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* right symbol is used. On US keyboards, the shift key changes the
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* keyboard level, and there are no groups. A group switch key might
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* convert a keyboard between Hebrew to English modes, for example.
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* #GdkEventKey contains a %group field that indicates the active
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* keyboard group. The level is computed from the modifier mask.
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* The returned array should be freed
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* with g_free().
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*
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* Return value: %TRUE if keys were found and returned
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**/
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gboolean
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gdk_keymap_get_entries_for_keyval (GdkKeymap *keymap,
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guint keyval,
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GdkKeymapKey **keys,
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gint *n_keys)
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{
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return GDK_KEYMAP_GET_CLASS(keymap)->get_entries_for_keyval (keymap, keyval, keys, n_keys);
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}
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/**
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* gdk_keymap_get_entries_for_keycode:
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* @keymap: a #GdkKeymap
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* @hardware_keycode: a keycode
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* @keys: (out): return location for array of #GdkKeymapKey, or %NULL
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* @keyvals: (out): return location for array of keyvals, or %NULL
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* @n_entries: length of @keys and @keyvals
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*
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* Returns the keyvals bound to @hardware_keycode.
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* The Nth #GdkKeymapKey in @keys is bound to the Nth
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* keyval in @keyvals. Free the returned arrays with g_free().
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* When a keycode is pressed by the user, the keyval from
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* this list of entries is selected by considering the effective
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* keyboard group and level. See gdk_keymap_translate_keyboard_state().
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*
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* Returns: %TRUE if there were any entries
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**/
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gboolean
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gdk_keymap_get_entries_for_keycode (GdkKeymap *keymap,
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guint hardware_keycode,
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GdkKeymapKey **keys,
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guint **keyvals,
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gint *n_entries)
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{
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return GDK_KEYMAP_GET_CLASS(keymap)->get_entries_for_keycode (keymap, hardware_keycode, keys, keyvals, n_entries);
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}
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/**
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* gdk_keymap_lookup_key:
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* @keymap: a #GdkKeymap
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* @key: a #GdkKeymapKey with keycode, group, and level initialized
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*
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* Looks up the keyval mapped to a keycode/group/level triplet.
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* If no keyval is bound to @key, returns 0. For normal user input,
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* you want to use gdk_keymap_translate_keyboard_state() instead of
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* this function, since the effective group/level may not be
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* the same as the current keyboard state.
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*
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* Return value: a keyval, or 0 if none was mapped to the given @key
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**/
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guint
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gdk_keymap_lookup_key (GdkKeymap *keymap,
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const GdkKeymapKey *key)
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{
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return GDK_KEYMAP_GET_CLASS(keymap)->lookup_key (keymap, key);
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}
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/**
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* gdk_keymap_translate_keyboard_state:
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* @keymap: a #GdkKeymap
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* @hardware_keycode: a keycode
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* @state: a modifier state
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* @group: active keyboard group
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* @keyval: (out) (allow-none): return location for keyval, or %NULL
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* @effective_group: (out) (allow-none): return location for effective
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* group, or %NULL
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* @level: (out) (allow-none): return location for level, or %NULL
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* @consumed_modifiers: (out) (allow-none): return location for modifiers
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* that were used to determine the group or level, or %NULL
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*
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* Translates the contents of a #GdkEventKey into a keyval, effective
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* group, and level. Modifiers that affected the translation and
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* are thus unavailable for application use are returned in
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* @consumed_modifiers.
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* See <xref linkend="key-group-explanation"/> for an explanation of
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* groups and levels. The @effective_group is the group that was
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* actually used for the translation; some keys such as Enter are not
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* affected by the active keyboard group. The @level is derived from
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* @state. For convenience, #GdkEventKey already contains the translated
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* keyval, so this function isn't as useful as you might think.
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*
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* <note><para>
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* @consumed_modifiers gives modifiers that should be masked out
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* from @state when comparing this key press to a hot key. For
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* instance, on a US keyboard, the <literal>plus</literal>
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* symbol is shifted, so when comparing a key press to a
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* <literal><Control>plus</literal> accelerator <Shift> should
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|
* be masked out.
|
|
* </para>
|
|
* <informalexample><programlisting>
|
|
* /* We want to ignore irrelevant modifiers like ScrollLock */
|
|
* #define ALL_ACCELS_MASK (GDK_CONTROL_MASK | GDK_SHIFT_MASK | GDK_MOD1_MASK)
|
|
* gdk_keymap_translate_keyboard_state (keymap, event->hardware_keycode,
|
|
* event->state, event->group,
|
|
* &keyval, NULL, NULL, &consumed);
|
|
* if (keyval == GDK_PLUS &&
|
|
* (event->state & ~consumed & ALL_ACCELS_MASK) == GDK_CONTROL_MASK)
|
|
* /* Control was pressed */
|
|
* </programlisting></informalexample>
|
|
* <para>
|
|
* An older interpretation @consumed_modifiers was that it contained
|
|
* all modifiers that might affect the translation of the key;
|
|
* this allowed accelerators to be stored with irrelevant consumed
|
|
* modifiers, by doing:</para>
|
|
* <informalexample><programlisting>
|
|
* /* XXX Don't do this XXX */
|
|
* if (keyval == accel_keyval &&
|
|
* (event->state & ~consumed & ALL_ACCELS_MASK) == (accel_mods & ~consumed))
|
|
* /* Accelerator was pressed */
|
|
* </programlisting></informalexample>
|
|
* <para>
|
|
* However, this did not work if multi-modifier combinations were
|
|
* used in the keymap, since, for instance, <literal><Control></literal>
|
|
* would be masked out even if only <literal><Control><Alt></literal>
|
|
* was used in the keymap. To support this usage as well as well as
|
|
* possible, all <emphasis>single modifier</emphasis> combinations
|
|
* that could affect the key for any combination of modifiers will
|
|
* be returned in @consumed_modifiers; multi-modifier combinations
|
|
* are returned only when actually found in @state. When you store
|
|
* accelerators, you should always store them with consumed modifiers
|
|
* removed. Store <literal><Control>plus</literal>,
|
|
* not <literal><Control><Shift>plus</literal>,
|
|
* </para></note>
|
|
*
|
|
* Return value: %TRUE if there was a keyval bound to the keycode/state/group
|
|
**/
|
|
gboolean
|
|
gdk_keymap_translate_keyboard_state (GdkKeymap *keymap,
|
|
guint hardware_keycode,
|
|
GdkModifierType state,
|
|
gint group,
|
|
guint *keyval,
|
|
gint *effective_group,
|
|
gint *level,
|
|
GdkModifierType *consumed_modifiers)
|
|
{
|
|
return GDK_KEYMAP_GET_CLASS(keymap)->translate_keyboard_state (keymap,
|
|
hardware_keycode,
|
|
state,
|
|
group,
|
|
keyval,
|
|
effective_group,
|
|
level,
|
|
consumed_modifiers);
|
|
}
|
|
|
|
/**
|
|
* gdk_keymap_add_virtual_modifiers:
|
|
* @keymap: a #GdkKeymap
|
|
* @state: pointer to the modifier mask to change
|
|
*
|
|
* Adds virtual modifiers (i.e. Super, Hyper and Meta) which correspond
|
|
* to the real modifiers (i.e Mod2, Mod3, ...) in @modifiers.
|
|
* are set in @state to their non-virtual counterparts (i.e. Mod2,
|
|
* Mod3,...) and set the corresponding bits in @state.
|
|
*
|
|
* GDK already does this before delivering key events, but for
|
|
* compatibility reasons, it only sets the first virtual modifier
|
|
* it finds, whereas this function sets all matching virtual modifiers.
|
|
*
|
|
* This function is useful when matching key events against
|
|
* accelerators.
|
|
*
|
|
* Since: 2.20
|
|
*/
|
|
void
|
|
gdk_keymap_add_virtual_modifiers (GdkKeymap *keymap,
|
|
GdkModifierType *state)
|
|
{
|
|
GDK_KEYMAP_GET_CLASS(keymap)->add_virtual_modifiers (keymap, state);
|
|
}
|
|
|
|
/**
|
|
* gdk_keymap_map_virtual_modifiers:
|
|
* @keymap: a #GdkKeymap
|
|
* @state: pointer to the modifier state to map
|
|
*
|
|
* Maps the virtual modifiers (i.e. Super, Hyper and Meta) which
|
|
* are set in @state to their non-virtual counterparts (i.e. Mod2,
|
|
* Mod3,...) and set the corresponding bits in @state.
|
|
*
|
|
* This function is useful when matching key events against
|
|
* accelerators.
|
|
*
|
|
* Returns: %TRUE if no virtual modifiers were mapped to the
|
|
* same non-virtual modifier. Note that %FALSE is also returned
|
|
* if a virtual modifier is mapped to a non-virtual modifier that
|
|
* was already set in @state.
|
|
*
|
|
* Since: 2.20
|
|
*/
|
|
gboolean
|
|
gdk_keymap_map_virtual_modifiers (GdkKeymap *keymap,
|
|
GdkModifierType *state)
|
|
{
|
|
return GDK_KEYMAP_GET_CLASS(keymap)->map_virtual_modifiers (keymap, state);
|
|
}
|
|
|
|
/**
|
|
* gdk_keyval_name:
|
|
* @keyval: a key value
|
|
*
|
|
* Converts a key value into a symbolic name.
|
|
*
|
|
* The names are the same as those in the
|
|
* <filename><gdk/gdkkeysyms.h></filename> header file
|
|
* but without the leading "GDK_KEY_".
|
|
*
|
|
* Return value: (transfer none): a string containing the name of the key,
|
|
* or %NULL if @keyval is not a valid key. The string should not be
|
|
* modified.
|
|
*/
|
|
gchar*
|
|
gdk_keyval_name (guint keyval)
|
|
{
|
|
GdkDisplayManager *manager = gdk_display_manager_get ();
|
|
|
|
return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_keyval_name (manager, keyval);
|
|
}
|
|
|
|
/**
|
|
* gdk_keyval_from_name:
|
|
* @keyval_name: a key name
|
|
*
|
|
* Converts a key name to a key value.
|
|
*
|
|
* The names are the same as those in the
|
|
* <filename><gdk/gdkkeysyms.h></filename> header file
|
|
* but without the leading "GDK_KEY_".
|
|
*
|
|
* Returns: the corresponding key value, or %GDK_KEY_VoidSymbol
|
|
* if the key name is not a valid key
|
|
*/
|
|
guint
|
|
gdk_keyval_from_name (const gchar *keyval_name)
|
|
{
|
|
GdkDisplayManager *manager = gdk_display_manager_get ();
|
|
|
|
return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->lookup_keyval (manager, keyval_name);
|
|
}
|