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Learning_GTK4_tree/gtk/gtkimcontextsimple.c

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2023-12-12 11:36:42 +01:00
/* GTK - The GIMP Toolkit
* Copyright (C) 2000 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk/gdk.h>
#include <stdlib.h>
#include <string.h>
#include "gtkprivate.h"
#include "gtkaccelgroup.h"
#include "gtkimcontextsimple.h"
#include "gtksettings.h"
#include "gtkwidget.h"
#include "gtkdebug.h"
#include "gtkcomposetable.h"
#include "gtkimmoduleprivate.h"
#include "gtkimcontextsimpleseqs.h"
#include "gdk/gdkeventsprivate.h"
#include "gdk/gdkprofilerprivate.h"
/**
* GtkIMContextSimple:
*
* `GtkIMContextSimple` is an input method supporting table-based input methods.
*
* ## Compose sequences
*
* `GtkIMContextSimple` reads compose sequences from the first of the
* following files that is found: ~/.config/gtk-4.0/Compose, ~/.XCompose,
* /usr/share/X11/locale/$locale/Compose (for locales that have a nontrivial
* Compose file). A subset of the file syntax described in the Compose(5)
* manual page is supported. Additionally, `include "%L"` loads GTK’s built-in
* table of compose sequences rather than the locale-specific one from X11.
*
* If none of these files is found, `GtkIMContextSimple` uses a built-in table
* of compose sequences that is derived from the X11 Compose files.
*
* Note that compose sequences typically start with the Compose_key, which is
* often not available as a dedicated key on keyboards. Keyboard layouts may
* map this keysym to other keys, such as the right Control key.
*
* ## Unicode characters
*
* `GtkIMContextSimple` also supports numeric entry of Unicode characters
* by typing <kbd>Ctrl</kbd>-<kbd>Shift</kbd>-<kbd>u</kbd>, followed by a
* hexadecimal Unicode codepoint.
*
* For example,
*
* Ctrl-Shift-u 1 2 3 Enter
*
* yields U+0123 LATIN SMALL LETTER G WITH CEDILLA, i.e. ģ.
*
* ## Dead keys
*
* `GtkIMContextSimple` supports dead keys. For example, typing
*
* dead_acute a
*
* yields U+00E! LATIN SMALL LETTER_A WITH ACUTE, i.e. á. Note that this
* depends on the keyboard layout including dead keys.
*/
struct _GtkIMContextSimplePrivate
{
guint *compose_buffer;
int compose_buffer_len;
GString *tentative_match;
int tentative_match_len;
guint in_hex_sequence : 1;
guint in_compose_sequence : 1;
guint modifiers_dropped : 1;
};
#include "gtk/compose/gtkcomposedata.h"
GtkComposeTable builtin_compose_table = {
NULL,
NULL,
MAX_SEQ_LEN,
N_INDEX_SIZE,
DATA_SIZE,
N_CHARS,
0
};
static void
init_builtin_table (void)
{
GBytes *bytes;
bytes = g_resources_lookup_data ("/org/gtk/libgtk/compose/sequences", 0, NULL);
builtin_compose_table.data = (guint16 *) g_bytes_get_data (bytes, NULL);
g_bytes_unref (bytes);
bytes = g_resources_lookup_data ("/org/gtk/libgtk/compose/chars", 0, NULL);
builtin_compose_table.char_data = (char *) g_bytes_get_data (bytes, NULL);
g_bytes_unref (bytes);
}
G_LOCK_DEFINE_STATIC (global_tables);
static GSList *global_tables;
static const guint gtk_compose_ignore[] = {
0, /* Yes, XKB will send us key press events with NoSymbol :( */
GDK_KEY_Overlay1_Enable,
GDK_KEY_Overlay2_Enable,
GDK_KEY_Shift_L,
GDK_KEY_Shift_R,
GDK_KEY_Control_L,
GDK_KEY_Control_R,
GDK_KEY_Caps_Lock,
GDK_KEY_Shift_Lock,
GDK_KEY_Meta_L,
GDK_KEY_Meta_R,
GDK_KEY_Alt_L,
GDK_KEY_Alt_R,
GDK_KEY_Super_L,
GDK_KEY_Super_R,
GDK_KEY_Hyper_L,
GDK_KEY_Hyper_R,
GDK_KEY_Mode_switch,
GDK_KEY_ISO_Level3_Shift,
GDK_KEY_ISO_Level3_Latch,
GDK_KEY_ISO_Level5_Shift,
GDK_KEY_ISO_Level5_Latch
};
static void gtk_im_context_simple_finalize (GObject *obj);
static gboolean gtk_im_context_simple_filter_keypress (GtkIMContext *context,
GdkEvent *key);
static void gtk_im_context_simple_reset (GtkIMContext *context);
static void gtk_im_context_simple_get_preedit_string (GtkIMContext *context,
char **str,
PangoAttrList **attrs,
int *cursor_pos);
static void init_compose_table_async (GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
G_DEFINE_TYPE_WITH_CODE (GtkIMContextSimple, gtk_im_context_simple, GTK_TYPE_IM_CONTEXT,
G_ADD_PRIVATE (GtkIMContextSimple)
gtk_im_module_ensure_extension_point ();
g_io_extension_point_implement (GTK_IM_MODULE_EXTENSION_POINT_NAME,
g_define_type_id,
"gtk-im-context-simple",
G_MININT))
static void
gtk_im_context_simple_class_init (GtkIMContextSimpleClass *class)
{
GtkIMContextClass *im_context_class = GTK_IM_CONTEXT_CLASS (class);
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
im_context_class->filter_keypress = gtk_im_context_simple_filter_keypress;
im_context_class->reset = gtk_im_context_simple_reset;
im_context_class->get_preedit_string = gtk_im_context_simple_get_preedit_string;
gobject_class->finalize = gtk_im_context_simple_finalize;
init_builtin_table ();
init_compose_table_async (NULL, NULL, NULL);
}
static int
gtk_compose_table_find (gconstpointer data1,
gconstpointer data2)
{
const GtkComposeTable *compose_table = (const GtkComposeTable *) data1;
guint32 hash = (guint32) GPOINTER_TO_INT (data2);
return compose_table->id != hash;
}
static gboolean
add_compose_table_from_file (const char *compose_file)
{
guint hash;
gboolean ret = FALSE;
G_LOCK (global_tables);
hash = g_str_hash (compose_file);
if (!g_slist_find_custom (global_tables, GINT_TO_POINTER (hash), gtk_compose_table_find))
{
GtkComposeTable *table;
table = gtk_compose_table_new_with_file (compose_file);
if (table)
{
ret = TRUE;
global_tables = g_slist_prepend (global_tables, table);
}
}
G_UNLOCK (global_tables);
return ret;
}
static void
add_builtin_compose_table (void)
{
G_LOCK (global_tables);
global_tables = g_slist_prepend (global_tables, &builtin_compose_table);
G_UNLOCK (global_tables);
}
static void
add_compose_table_from_data (guint16 *data,
int max_seq_len,
int n_seqs)
{
guint hash;
G_LOCK (global_tables);
hash = gtk_compose_table_data_hash (data, max_seq_len, n_seqs);
if (!g_slist_find_custom (global_tables, GINT_TO_POINTER (hash), gtk_compose_table_find))
{
GtkComposeTable *table;
table = gtk_compose_table_new_with_data (data, max_seq_len, n_seqs);
if (table)
global_tables = g_slist_prepend (global_tables, table);
}
G_UNLOCK (global_tables);
}
static void
gtk_im_context_simple_init_compose_table (void)
{
char *path = NULL;
const char *home;
const char *locale;
char **langs = NULL;
char **lang = NULL;
const char * const sys_langs[] = { "el_gr", "fi_fi", "pt_br", NULL };
const char * const *sys_lang = NULL;
path = g_build_filename (g_get_user_config_dir (), "gtk-4.0", "Compose", NULL);
if (g_file_test (path, G_FILE_TEST_EXISTS))
{
if (add_compose_table_from_file (path))
{
g_free (path);
return;
}
}
g_clear_pointer (&path, g_free);
home = g_get_home_dir ();
if (home == NULL)
return;
path = g_build_filename (home, ".XCompose", NULL);
if (g_file_test (path, G_FILE_TEST_EXISTS))
{
if (add_compose_table_from_file (path))
{
g_free (path);
return;
}
}
g_clear_pointer (&path, g_free);
locale = g_getenv ("LC_CTYPE");
if (locale == NULL)
locale = g_getenv ("LANG");
if (locale == NULL)
locale = "C";
/* FIXME: https://bugzilla.gnome.org/show_bug.cgi?id=751826 */
langs = g_get_locale_variants (locale);
for (lang = langs; *lang; lang++)
{
if (g_str_has_prefix (*lang, "en_US"))
break;
if (**lang == 'C')
break;
/* Other languages just include en_us compose table. */
for (sys_lang = sys_langs; *sys_lang; sys_lang++)
{
if (g_ascii_strncasecmp (*lang, *sys_lang, strlen (*sys_lang)) == 0)
{
char *x11_compose_file_dir = gtk_compose_table_get_x11_compose_file_dir ();
path = g_build_filename (x11_compose_file_dir, *lang, "Compose", NULL);
g_free (x11_compose_file_dir);
break;
}
}
if (path == NULL)
continue;
if (g_file_test (path, G_FILE_TEST_EXISTS))
break;
g_clear_pointer (&path, g_free);
}
g_strfreev (langs);
if (path != NULL &&
add_compose_table_from_file (path))
{
g_free (path);
return;
}
g_clear_pointer (&path, g_free);
add_builtin_compose_table ();
}
static void
init_compose_table_thread_cb (GTask *task,
gpointer source_object,
gpointer task_data,
GCancellable *cancellable)
{
gint64 before G_GNUC_UNUSED;
before = GDK_PROFILER_CURRENT_TIME;
if (g_task_return_error_if_cancelled (task))
return;
gtk_im_context_simple_init_compose_table ();
g_task_return_boolean (task, TRUE);
gdk_profiler_end_mark (before, "im compose table load (thread)", NULL);
}
static void
init_compose_table_async (GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task = g_task_new (NULL, cancellable, callback, user_data);
g_task_set_source_tag (task, init_compose_table_async);
g_task_run_in_thread (task, init_compose_table_thread_cb);
g_object_unref (task);
}
static void
gtk_im_context_simple_init (GtkIMContextSimple *context_simple)
{
GtkIMContextSimplePrivate *priv;
priv = context_simple->priv = gtk_im_context_simple_get_instance_private (context_simple);
priv->compose_buffer_len = builtin_compose_table.max_seq_len + 1;
priv->compose_buffer = g_new0 (guint, priv->compose_buffer_len);
priv->tentative_match = g_string_new ("");
priv->tentative_match_len = 0;
}
static void
gtk_im_context_simple_finalize (GObject *obj)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (obj);
GtkIMContextSimplePrivate *priv = context_simple->priv;;
g_free (priv->compose_buffer);
g_string_free (priv->tentative_match, TRUE);
G_OBJECT_CLASS (gtk_im_context_simple_parent_class)->finalize (obj);
}
/**
* gtk_im_context_simple_new:
*
* Creates a new `GtkIMContextSimple`.
*
* Returns: a new `GtkIMContextSimple`
*/
GtkIMContext *
gtk_im_context_simple_new (void)
{
return g_object_new (GTK_TYPE_IM_CONTEXT_SIMPLE, NULL);
}
static void
gtk_im_context_simple_commit_string (GtkIMContextSimple *context_simple,
const char *str)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
if (priv->in_hex_sequence ||
priv->tentative_match_len > 0 ||
priv->compose_buffer[0] != 0)
{
g_string_set_size (priv->tentative_match, 0);
priv->tentative_match_len = 0;
priv->in_hex_sequence = FALSE;
priv->in_compose_sequence = FALSE;
priv->compose_buffer[0] = 0;
g_signal_emit_by_name (context_simple, "preedit-changed");
g_signal_emit_by_name (context_simple, "preedit-end");
}
g_signal_emit_by_name (context_simple, "commit", str);
}
static void
gtk_im_context_simple_commit_char (GtkIMContextSimple *context_simple,
gunichar ch)
{
char buf[8] = { 0, };
g_unichar_to_utf8 (ch, buf);
gtk_im_context_simple_commit_string (context_simple, buf);
}
/* In addition to the table-driven sequences, we allow Unicode hex
* codes to be entered. The method chosen here is similar to the
* one recommended in ISO 14755, but not exactly the same, since we
* don’t want to steal 16 valuable key combinations.
*
* A hex Unicode sequence must be started with Ctrl-Shift-U, followed
* by a sequence of hex digits entered with Ctrl-Shift still held.
* Releasing one of the modifiers or pressing space while the modifiers
* are still held commits the character. It is possible to erase
* digits using backspace.
*
* As an extension to the above, we also allow to start the sequence
* with Ctrl-Shift-U, then release the modifiers before typing any
* digits, and enter the digits without modifiers.
*/
static gboolean
check_hex (GtkIMContextSimple *context_simple,
int n_compose)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
/* See if this is a hex sequence, return TRUE if so */
int i;
GString *str;
gulong n;
char *nptr = NULL;
char buf[7];
g_string_set_size (priv->tentative_match, 0);
priv->tentative_match_len = 0;
str = g_string_new (NULL);
i = 0;
while (i < n_compose)
{
gunichar ch;
ch = gdk_keyval_to_unicode (priv->compose_buffer[i]);
if (ch == 0 || !g_unichar_isxdigit (ch))
{
g_string_free (str, TRUE);
return FALSE;
}
buf[g_unichar_to_utf8 (ch, buf)] = '\0';
g_string_append (str, buf);
++i;
}
n = strtoul (str->str, &nptr, 16);
/* If strtoul fails it probably means non-latin digits were used;
* we should in principle handle that, but we probably don't.
*/
if (nptr - str->str < str->len)
{
g_string_free (str, TRUE);
return FALSE;
}
else
g_string_free (str, TRUE);
if (g_unichar_validate (n))
{
g_string_set_size (priv->tentative_match, 0);
g_string_append_unichar (priv->tentative_match, n);
priv->tentative_match_len = n_compose;
}
return TRUE;
}
static void
beep_surface (GdkSurface *surface)
{
GdkDisplay *display = gdk_surface_get_display (surface);
gboolean beep;
g_object_get (gtk_settings_get_for_display (display),
"gtk-error-bell", &beep,
NULL);
if (beep)
gdk_surface_beep (surface);
}
static inline gboolean
is_dead_key (guint keysym)
{
return GDK_KEY_dead_grave <= keysym && keysym <= GDK_KEY_dead_greek;
}
static void
append_dead_key (GString *string,
guint keysym)
{
/* Sadly, not all the dead keysyms have spacing mark equivalents
* in Unicode. For those that don't, we use NBSP + the non-spacing
* mark as an approximation.
*/
switch (keysym)
{
#define CASE(keysym, unicode, sp) \
case GDK_KEY_dead_##keysym: \
if (sp) \
g_string_append_unichar (string, 0xA0); \
g_string_append_unichar (string, unicode); \
break;
CASE (grave, 0x60, 0);
CASE (acute, 0xb4, 0);
CASE (circumflex, 0x5e, 0);
CASE (tilde, 0x7e, 0);
CASE (macron, 0xaf, 0);
CASE (breve, 0x2d8, 0);
CASE (abovedot, 0x307, 1);
CASE (diaeresis, 0xa8, 0);
CASE (abovering, 0x2da, 0);
CASE (hook, 0x2c0, 0);
CASE (doubleacute, 0x2dd, 0);
CASE (caron, 0x2c7, 0);
CASE (cedilla, 0xb8, 0);
CASE (ogonek, 0x2db, 0);
CASE (iota, 0x37a, 0);
CASE (voiced_sound, 0x3099, 1);
CASE (semivoiced_sound, 0x309a, 1);
CASE (belowdot, 0x323, 1);
CASE (horn, 0x31b, 1);
CASE (stroke, 0x335, 1);
CASE (abovecomma, 0x2bc, 0);
CASE (abovereversedcomma, 0x2bd, 1);
CASE (doublegrave, 0x30f, 1);
CASE (belowring, 0x2f3, 0);
CASE (belowmacron, 0x2cd, 0);
CASE (belowcircumflex, 0x32d, 1);
CASE (belowtilde, 0x330, 1);
CASE (belowbreve, 0x32e, 1);
CASE (belowdiaeresis, 0x324, 1);
CASE (invertedbreve, 0x32f, 1);
CASE (belowcomma, 0x326, 1);
CASE (lowline, 0x5f, 0);
CASE (aboveverticalline, 0x2c8, 0);
CASE (belowverticalline, 0x2cc, 0);
CASE (longsolidusoverlay, 0x338, 1);
CASE (a, 0x363, 1);
CASE (A, 0x363, 1);
CASE (e, 0x364, 1);
CASE (E, 0x364, 1);
CASE (i, 0x365, 1);
CASE (I, 0x365, 1);
CASE (o, 0x366, 1);
CASE (O, 0x366, 1);
CASE (u, 0x367, 1);
CASE (U, 0x367, 1);
CASE (small_schwa, 0x1dea, 1);
CASE (capital_schwa, 0x1dea, 1);
#undef CASE
default:
g_string_append_unichar (string, gdk_keyval_to_unicode (keysym));
}
}
static gboolean
no_sequence_matches (GtkIMContextSimple *context_simple,
int n_compose,
GdkEvent *event)
{
GtkIMContextSimplePrivate *priv = context_simple->priv;
GtkIMContext *context;
gunichar ch;
guint keyval;
context = GTK_IM_CONTEXT (context_simple);
priv->in_compose_sequence = FALSE;
/* No compose sequences found, check first if we have a partial
* match pending.
*/
if (priv->tentative_match_len > 0)
{
int len = priv->tentative_match_len;
int i;
guint *compose_buffer;
char *str;
compose_buffer = alloca (sizeof (guint) * priv->compose_buffer_len);
memcpy (compose_buffer, priv->compose_buffer, sizeof (guint) * priv->compose_buffer_len);
str = g_strdup (priv->tentative_match->str);
gtk_im_context_simple_commit_string (context_simple, str);
g_free (str);
for (i = 0; i < n_compose - len - 1; i++)
{
GdkTranslatedKey translated;
translated.keyval = compose_buffer[len + i];
translated.consumed = 0;
translated.layout = 0;
translated.level = 0;
GdkEvent *tmp_event = gdk_key_event_new (GDK_KEY_PRESS,
gdk_event_get_surface (event),
gdk_event_get_device (event),
gdk_event_get_time (event),
compose_buffer[len + i],
gdk_event_get_modifier_state (event),
FALSE,
&translated,
&translated,
NULL);
gtk_im_context_filter_keypress (context, tmp_event);
gdk_event_unref (tmp_event);
}
return gtk_im_context_filter_keypress (context, event);
}
else
{
int i;
for (i = 0; i < n_compose && is_dead_key (priv->compose_buffer[i]); i++)
;
if (n_compose > 1 && i >= n_compose - 1)
{
GString *s;
s = g_string_new ("");
if (i == n_compose - 1)
{
/* dead keys are never *really* dead */
for (int j = 0; j < i; j++)
append_dead_key (s, priv->compose_buffer[j]);
ch = gdk_keyval_to_unicode (priv->compose_buffer[i]);
if (ch != 0 && ch != ' ' && !g_unichar_iscntrl (ch))
g_string_append_unichar (s, ch);
gtk_im_context_simple_commit_string (context_simple, s->str);
}
else
{
append_dead_key (s, priv->compose_buffer[0]);
gtk_im_context_simple_commit_string (context_simple, s->str);
for (i = 1; i < n_compose; i++)
priv->compose_buffer[i - 1] = priv->compose_buffer[i];
priv->compose_buffer[n_compose - 1] = 0;
priv->in_compose_sequence = TRUE;
g_signal_emit_by_name (context, "preedit-start");
g_signal_emit_by_name (context, "preedit-changed");
}
g_string_free (s, TRUE);
return TRUE;
}
priv->compose_buffer[0] = 0;
if (n_compose > 1) /* Invalid sequence */
{
beep_surface (gdk_event_get_surface (event));
g_signal_emit_by_name (context, "preedit-changed");
g_signal_emit_by_name (context, "preedit-end");
return TRUE;
}
keyval = gdk_key_event_get_keyval (event);
ch = gdk_keyval_to_unicode (keyval);
if (ch != 0 && !g_unichar_iscntrl (ch))
{
gtk_im_context_simple_commit_char (context_simple, ch);
return TRUE;
}
else
return FALSE;
}
return FALSE;
}
static gboolean
is_hex_keyval (guint keyval)
{
gunichar ch = gdk_keyval_to_unicode (keyval);
return g_unichar_isxdigit (ch);
}
static guint
canonical_hex_keyval (GdkEvent *event)
{
guint keyval, event_keyval;
guint *keyvals = NULL;
int n_vals = 0;
int i;
event_keyval = gdk_key_event_get_keyval (event);
/* See if the keyval is already a hex digit */
if (is_hex_keyval (event_keyval))
return event_keyval;
/* See if this key would have generated a hex keyval in
* any other state, and return that hex keyval if so
*/
gdk_display_map_keycode (gdk_event_get_display (event),
gdk_key_event_get_keycode (event),
NULL,
&keyvals, &n_vals);
keyval = 0;
i = 0;
while (i < n_vals)
{
if (is_hex_keyval (keyvals[i]))
{
keyval = keyvals[i];
break;
}
++i;
}
g_free (keyvals);
if (keyval)
return keyval;
else
/* No way to make it a hex digit
*/
return 0;
}
static gboolean
gtk_im_context_simple_filter_keypress (GtkIMContext *context,
GdkEvent *event)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
GdkSurface *surface = gdk_event_get_surface ((GdkEvent *) event);
GSList *tmp_list;
int n_compose = 0;
GdkModifierType hex_mod_mask;
gboolean have_hex_mods;
gboolean is_hex_start;
gboolean is_hex_end;
gboolean is_backspace;
gboolean is_escape;
guint hex_keyval;
int i;
gboolean compose_finish;
gboolean compose_match;
guint keyval, state;
while (n_compose < priv->compose_buffer_len && priv->compose_buffer[n_compose] != 0)
n_compose++;
keyval = gdk_key_event_get_keyval (event);
state = gdk_event_get_modifier_state (event);
if (gdk_event_get_event_type (event) == GDK_KEY_RELEASE)
{
if (priv->in_hex_sequence &&
(keyval == GDK_KEY_Control_L || keyval == GDK_KEY_Control_R ||
keyval == GDK_KEY_Shift_L || keyval == GDK_KEY_Shift_R))
{
if (priv->tentative_match->len > 0)
{
char *str = g_strdup (priv->tentative_match->str);
gtk_im_context_simple_commit_string (context_simple, str);
g_free (str);
return TRUE;
}
else if (n_compose == 0)
{
priv->modifiers_dropped = TRUE;
return TRUE;
}
else if (priv->in_hex_sequence)
{
/* invalid hex sequence */
beep_surface (surface);
g_string_set_size (priv->tentative_match, 0);
priv->in_hex_sequence = FALSE;
priv->compose_buffer[0] = 0;
g_signal_emit_by_name (context_simple, "preedit-changed");
g_signal_emit_by_name (context_simple, "preedit-end");
return TRUE;
}
}
if (priv->in_hex_sequence || priv->in_compose_sequence)
return TRUE; /* Don't leak random key events during preedit */
return FALSE;
}
/* Ignore modifier key presses */
for (i = 0; i < G_N_ELEMENTS (gtk_compose_ignore); i++)
if (keyval == gtk_compose_ignore[i])
{
if (priv->in_hex_sequence || priv->in_compose_sequence)
return TRUE; /* Don't leak random key events during preedit */
return FALSE;
}
hex_mod_mask = GDK_CONTROL_MASK|GDK_SHIFT_MASK;
if (priv->in_hex_sequence && priv->modifiers_dropped)
have_hex_mods = TRUE;
else
have_hex_mods = (state & (hex_mod_mask)) == hex_mod_mask;
is_hex_start = keyval == GDK_KEY_U;
is_hex_end = (keyval == GDK_KEY_space ||
keyval == GDK_KEY_KP_Space ||
keyval == GDK_KEY_Return ||
keyval == GDK_KEY_ISO_Enter ||
keyval == GDK_KEY_KP_Enter);
is_backspace = keyval == GDK_KEY_BackSpace;
is_escape = keyval == GDK_KEY_Escape;
hex_keyval = canonical_hex_keyval (event);
/* If we are already in a non-hex sequence, or
* this keystroke is not hex modifiers + hex digit, don't filter
* key events with accelerator modifiers held down. We only treat
* Control and Alt as accel modifiers here, since Super, Hyper and
* Meta are often co-located with Mode_Switch, Multi_Key or
* ISO_Level3_Switch.
*/
if (!have_hex_mods ||
(n_compose > 0 && !priv->in_hex_sequence) ||
(n_compose == 0 && !priv->in_hex_sequence && !is_hex_start) ||
(priv->in_hex_sequence && !hex_keyval &&
!is_hex_start && !is_hex_end && !is_escape && !is_backspace))
{
GdkModifierType no_text_input_mask;
GdkModifierType consumed_modifiers = 0;
no_text_input_mask = GDK_ALT_MASK|GDK_CONTROL_MASK;
#ifdef G_OS_WIN32
/* On Win32, even Ctrl + Alt could be text input because AltGr = Ctrl
* + Alt. For example, Ctrl + Alt + e = € on a German keyboard. The
* GdkEvent's state, however, reports *all* modifiers that were
* active at the time the key was pressed, including the ones that
* were consumed to generate the keyval. So we cannot just assume
* that any key event containing Ctrl or Alt is a keybinding. We have
* to first check if those modifiers were actually used to generate
* the keyval. If so, then the keypress is regular input and we
* should not exit here.
*/
consumed_modifiers = gdk_key_event_get_consumed_modifiers (event);
#endif
if (priv->in_hex_sequence && priv->modifiers_dropped &&
(keyval == GDK_KEY_Return ||
keyval == GDK_KEY_ISO_Enter ||
keyval == GDK_KEY_KP_Enter))
{
return FALSE;
}
if (state & no_text_input_mask & ~consumed_modifiers)
{
if (priv->in_hex_sequence || priv->in_compose_sequence)
return TRUE; /* Don't leak random key events during preedit */
return FALSE;
}
}
/* Handle backspace */
if (priv->in_hex_sequence && have_hex_mods && is_backspace)
{
if (n_compose > 0)
{
n_compose--;
priv->compose_buffer[n_compose] = 0;
check_hex (context_simple, n_compose);
}
else
{
priv->in_hex_sequence = FALSE;
}
g_signal_emit_by_name (context_simple, "preedit-changed");
if (!priv->in_hex_sequence)
g_signal_emit_by_name (context_simple, "preedit-end");
return TRUE;
}
if (!priv->in_hex_sequence && n_compose > 0 && is_backspace)
{
n_compose--;
priv->compose_buffer[n_compose] = 0;
g_signal_emit_by_name (context_simple, "preedit-changed");
if (n_compose == 0)
g_signal_emit_by_name (context_simple, "preedit-end");
return TRUE;
}
/* Check for hex sequence restart */
if (priv->in_hex_sequence && have_hex_mods && is_hex_start)
{
if (priv->tentative_match->len > 0)
{
char *str = g_strdup (priv->tentative_match->str);
gtk_im_context_simple_commit_string (context_simple, str);
g_free (str);
}
else
{
/* invalid hex sequence */
if (n_compose > 0)
beep_surface (surface);
g_string_set_size (priv->tentative_match, 0);
priv->in_hex_sequence = FALSE;
priv->compose_buffer[0] = 0;
}
}
/* Check for hex sequence start */
if (!priv->in_hex_sequence && have_hex_mods && is_hex_start)
{
priv->compose_buffer[0] = 0;
priv->in_hex_sequence = TRUE;
priv->modifiers_dropped = FALSE;
g_string_set_size (priv->tentative_match, 0);
g_signal_emit_by_name (context_simple, "preedit-start");
g_signal_emit_by_name (context_simple, "preedit-changed");
return TRUE;
}
if (is_escape)
{
if (priv->in_hex_sequence || priv->in_compose_sequence)
{
gtk_im_context_simple_reset (context);
return TRUE;
}
return FALSE;
}
if (priv->in_hex_sequence)
{
if (hex_keyval && n_compose < 6)
priv->compose_buffer[n_compose++] = hex_keyval;
else if (!is_hex_end)
{
/* non-hex character in hex sequence, or sequence too long */
beep_surface (surface);
return TRUE;
}
}
else
{
if (n_compose + 1 == priv->compose_buffer_len)
{
priv->compose_buffer_len += 1;
priv->compose_buffer = g_renew (guint, priv->compose_buffer, priv->compose_buffer_len);
}
priv->compose_buffer[n_compose++] = keyval;
}
priv->compose_buffer[n_compose] = 0;
if (priv->in_hex_sequence)
{
/* If the modifiers are still held down, consider the sequence again */
if (have_hex_mods)
{
/* space or return ends the sequence, and we eat the key */
if (n_compose > 0 && is_hex_end)
{
if (priv->tentative_match->len > 0)
{
char *str = g_strdup (priv->tentative_match->str);
gtk_im_context_simple_commit_string (context_simple, str);
g_free (str);
return TRUE;
}
else
{
/* invalid hex sequence */
beep_surface (surface);
g_string_set_size (priv->tentative_match, 0);
priv->in_hex_sequence = FALSE;
priv->compose_buffer[0] = 0;
}
}
else if (!check_hex (context_simple, n_compose))
beep_surface (surface);
g_signal_emit_by_name (context_simple, "preedit-changed");
if (!priv->in_hex_sequence)
g_signal_emit_by_name (context_simple, "preedit-end");
return TRUE;
}
}
else /* Then, check for compose sequences */
{
gboolean success = FALSE;
int prefix = 0;
GString *output;
output = g_string_new ("");
G_LOCK (global_tables);
tmp_list = global_tables;
while (tmp_list)
{
if (gtk_compose_table_check ((GtkComposeTable *)tmp_list->data,
priv->compose_buffer, n_compose,
&compose_finish, &compose_match,
output))
{
if (!priv->in_compose_sequence)
{
priv->in_compose_sequence = TRUE;
g_signal_emit_by_name (context_simple, "preedit-start");
}
if (compose_finish)
{
if (compose_match)
gtk_im_context_simple_commit_string (context_simple, output->str);
}
else
{
if (compose_match)
{
g_string_assign (priv->tentative_match, output->str);
priv->tentative_match_len = n_compose;
}
g_signal_emit_by_name (context_simple, "preedit-changed");
}
success = TRUE;
break;
}
else
{
int table_prefix;
gtk_compose_table_get_prefix ((GtkComposeTable *)tmp_list->data,
priv->compose_buffer, n_compose,
&table_prefix);
prefix = MAX (prefix, table_prefix);
}
tmp_list = tmp_list->next;
}
G_UNLOCK (global_tables);
if (success)
{
g_string_free (output, TRUE);
return TRUE;
}
if (gtk_check_algorithmically (priv->compose_buffer, n_compose, output))
{
if (!priv->in_compose_sequence)
{
priv->in_compose_sequence = TRUE;
g_signal_emit_by_name (context_simple, "preedit-start");
}
if (output->len > 0)
gtk_im_context_simple_commit_string (context_simple, output->str);
else
g_signal_emit_by_name (context_simple, "preedit-changed");
g_string_free (output, TRUE);
return TRUE;
}
g_string_free (output, TRUE);
/* If we get here, no Compose sequence matched.
* Only beep if we were in a sequence before.
*/
if (prefix > 0)
{
for (i = prefix; i < n_compose; i++)
priv->compose_buffer[i] = 0;
beep_surface (gdk_event_get_surface (event));
g_signal_emit_by_name (context_simple, "preedit-changed");
return TRUE;
}
}
/* The current compose_buffer doesn't match anything */
return no_sequence_matches (context_simple, n_compose, (GdkEvent *)event);
}
static void
gtk_im_context_simple_reset (GtkIMContext *context)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
priv->compose_buffer[0] = 0;
if (priv->tentative_match->len > 0 ||
priv->in_hex_sequence ||
priv->in_compose_sequence)
{
priv->in_hex_sequence = FALSE;
priv->in_compose_sequence = FALSE;
g_string_set_size (priv->tentative_match, 0);
priv->tentative_match_len = 0;
g_signal_emit_by_name (context_simple, "preedit-changed");
g_signal_emit_by_name (context_simple, "preedit-end");
}
}
static void
gtk_im_context_simple_get_preedit_string (GtkIMContext *context,
char **str,
PangoAttrList **attrs,
int *cursor_pos)
{
GtkIMContextSimple *context_simple = GTK_IM_CONTEXT_SIMPLE (context);
GtkIMContextSimplePrivate *priv = context_simple->priv;
GString *s;
int i;
s = g_string_new ("");
if (priv->in_hex_sequence)
{
g_string_append_c (s, 'u');
for (i = 0; priv->compose_buffer[i]; i++)
g_string_append_unichar (s, gdk_keyval_to_unicode (priv->compose_buffer[i]));
}
else if (priv->in_compose_sequence)
{
if (priv->tentative_match_len > 0 && priv->compose_buffer[0] != 0)
{
g_string_append (s, priv->tentative_match->str);
}
else
{
for (i = 0; priv->compose_buffer[i]; i++)
{
if (priv->compose_buffer[i] == GDK_KEY_Multi_key)
{
/* We only show the Compose key visibly when it is the
* only glyph in the preedit, or when the sequence contains
* multiple Compose keys, or when it occurs in the
* middle of the sequence. Sadly, the official character,
* U+2384, COMPOSITION SYMBOL, is bit too distracting, so
* we use U+00B7, MIDDLE DOT.
*/
if (priv->compose_buffer[1] == 0 || i > 0 ||
priv->compose_buffer[i + 1] == GDK_KEY_Multi_key)
g_string_append (s, "·");
}
else
{
gunichar ch;
if (is_dead_key (priv->compose_buffer[i]))
{
append_dead_key (s, priv->compose_buffer[i]);
}
else
{
ch = gdk_keyval_to_unicode (priv->compose_buffer[i]);
if (ch)
g_string_append_unichar (s, ch);
}
}
}
}
}
if (cursor_pos)
*cursor_pos = g_utf8_strlen (s->str, s->len);
if (attrs)
{
*attrs = pango_attr_list_new ();
if (s->len)
{
PangoAttribute *attr;
attr = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
attr->start_index = 0;
attr->end_index = s->len;
pango_attr_list_insert (*attrs, attr);
attr = pango_attr_fallback_new (TRUE);
attr->start_index = 0;
attr->end_index = s->len;
pango_attr_list_insert (*attrs, attr);
}
}
if (str)
*str = g_string_free (s, FALSE);
}
/**
* gtk_im_context_simple_add_table: (skip)
* @context_simple: A `GtkIMContextSimple`
* @data: (array): the table
* @max_seq_len: Maximum length of a sequence in the table
* @n_seqs: number of sequences in the table
*
* Adds an additional table to search to the input context.
* Each row of the table consists of @max_seq_len key symbols
* followed by two #guint16 interpreted as the high and low
* words of a #gunicode value. Tables are searched starting
* from the last added.
*
* The table must be sorted in dictionary order on the
* numeric value of the key symbol fields. (Values beyond
* the length of the sequence should be zero.)
*
* Deprecated: 4.4: Use gtk_im_context_simple_add_compose_file()
*/
void
gtk_im_context_simple_add_table (GtkIMContextSimple *context_simple,
guint16 *data,
int max_seq_len,
int n_seqs)
{
g_return_if_fail (GTK_IS_IM_CONTEXT_SIMPLE (context_simple));
add_compose_table_from_data (data, max_seq_len, n_seqs);
}
/**
* gtk_im_context_simple_add_compose_file:
* @context_simple: A `GtkIMContextSimple`
* @compose_file: The path of compose file
*
* Adds an additional table from the X11 compose file.
*/
void
gtk_im_context_simple_add_compose_file (GtkIMContextSimple *context_simple,
const char *compose_file)
{
g_return_if_fail (GTK_IS_IM_CONTEXT_SIMPLE (context_simple));
add_compose_table_from_file (compose_file);
}