mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-10 02:40:11 +00:00
348 lines
10 KiB
C
348 lines
10 KiB
C
/* GTK - The GIMP Toolkit
|
|
*
|
|
* 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/>.
|
|
*
|
|
* Author: Theppitak Karoonboonyanan <thep@linux.thai.net>
|
|
*
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
#include <gdk/gdkkeysyms.h>
|
|
#include "gtkimcontextthai.h"
|
|
#include "thai-charprop.h"
|
|
|
|
static void gtk_im_context_thai_class_init (GtkIMContextThaiClass *class);
|
|
static void gtk_im_context_thai_init (GtkIMContextThai *im_context_thai);
|
|
static gboolean gtk_im_context_thai_filter_keypress (GtkIMContext *context,
|
|
GdkEventKey *key);
|
|
|
|
#ifndef GTK_IM_CONTEXT_THAI_NO_FALLBACK
|
|
static void forget_previous_chars (GtkIMContextThai *context_thai);
|
|
static void remember_previous_char (GtkIMContextThai *context_thai,
|
|
gunichar new_char);
|
|
#endif /* !GTK_IM_CONTEXT_THAI_NO_FALLBACK */
|
|
|
|
static GObjectClass *parent_class;
|
|
|
|
GType gtk_type_im_context_thai = 0;
|
|
|
|
void
|
|
gtk_im_context_thai_register_type (GTypeModule *type_module)
|
|
{
|
|
const GTypeInfo im_context_thai_info =
|
|
{
|
|
sizeof (GtkIMContextThaiClass),
|
|
(GBaseInitFunc) NULL,
|
|
(GBaseFinalizeFunc) NULL,
|
|
(GClassInitFunc) gtk_im_context_thai_class_init,
|
|
NULL, /* class_finalize */
|
|
NULL, /* class_data */
|
|
sizeof (GtkIMContextThai),
|
|
0,
|
|
(GInstanceInitFunc) gtk_im_context_thai_init,
|
|
};
|
|
|
|
gtk_type_im_context_thai =
|
|
g_type_module_register_type (type_module,
|
|
GTK_TYPE_IM_CONTEXT,
|
|
"GtkIMContextThai",
|
|
&im_context_thai_info, 0);
|
|
}
|
|
|
|
static void
|
|
gtk_im_context_thai_class_init (GtkIMContextThaiClass *class)
|
|
{
|
|
GtkIMContextClass *im_context_class = GTK_IM_CONTEXT_CLASS (class);
|
|
|
|
parent_class = g_type_class_peek_parent (class);
|
|
|
|
im_context_class->filter_keypress = gtk_im_context_thai_filter_keypress;
|
|
}
|
|
|
|
static void
|
|
gtk_im_context_thai_init (GtkIMContextThai *context_thai)
|
|
{
|
|
#ifndef GTK_IM_CONTEXT_THAI_NO_FALLBACK
|
|
forget_previous_chars (context_thai);
|
|
#endif /* !GTK_IM_CONTEXT_THAI_NO_FALLBACK */
|
|
context_thai->isc_mode = ISC_BASICCHECK;
|
|
}
|
|
|
|
GtkIMContext *
|
|
gtk_im_context_thai_new (void)
|
|
{
|
|
GtkIMContextThai *result;
|
|
|
|
result = GTK_IM_CONTEXT_THAI (g_object_new (GTK_TYPE_IM_CONTEXT_THAI, NULL));
|
|
|
|
return GTK_IM_CONTEXT (result);
|
|
}
|
|
|
|
GtkIMContextThaiISCMode
|
|
gtk_im_context_thai_get_isc_mode (GtkIMContextThai *context_thai)
|
|
{
|
|
return context_thai->isc_mode;
|
|
}
|
|
|
|
GtkIMContextThaiISCMode
|
|
gtk_im_context_thai_set_isc_mode (GtkIMContextThai *context_thai,
|
|
GtkIMContextThaiISCMode mode)
|
|
{
|
|
GtkIMContextThaiISCMode prev_mode = context_thai->isc_mode;
|
|
context_thai->isc_mode = mode;
|
|
return prev_mode;
|
|
}
|
|
|
|
static gboolean
|
|
is_context_lost_key(guint keyval)
|
|
{
|
|
return ((keyval & 0xFF00) == 0xFF00) &&
|
|
(keyval == GDK_KEY_BackSpace ||
|
|
keyval == GDK_KEY_Tab ||
|
|
keyval == GDK_KEY_Linefeed ||
|
|
keyval == GDK_KEY_Clear ||
|
|
keyval == GDK_KEY_Return ||
|
|
keyval == GDK_KEY_Pause ||
|
|
keyval == GDK_KEY_Scroll_Lock ||
|
|
keyval == GDK_KEY_Sys_Req ||
|
|
keyval == GDK_KEY_Escape ||
|
|
keyval == GDK_KEY_Delete ||
|
|
(GDK_KEY_Home <= keyval && keyval <= GDK_KEY_Begin) || /* IsCursorkey */
|
|
(GDK_KEY_KP_Space <= keyval && keyval <= GDK_KEY_KP_Delete) || /* IsKeypadKey, non-chars only */
|
|
(GDK_KEY_Select <= keyval && keyval <= GDK_KEY_Break) || /* IsMiscFunctionKey */
|
|
(GDK_KEY_F1 <= keyval && keyval <= GDK_KEY_F35)); /* IsFunctionKey */
|
|
}
|
|
|
|
static gboolean
|
|
is_context_intact_key(guint keyval)
|
|
{
|
|
return (((keyval & 0xFF00) == 0xFF00) &&
|
|
((GDK_KEY_Shift_L <= keyval && keyval <= GDK_KEY_Hyper_R) || /* IsModifierKey */
|
|
(keyval == GDK_KEY_Mode_switch) ||
|
|
(keyval == GDK_KEY_Num_Lock))) ||
|
|
(((keyval & 0xFE00) == 0xFE00) &&
|
|
(GDK_KEY_ISO_Lock <= keyval && keyval <= GDK_KEY_ISO_Last_Group_Lock));
|
|
}
|
|
|
|
static gboolean
|
|
thai_is_accept (gunichar new_char, gunichar prev_char, gint isc_mode)
|
|
{
|
|
switch (isc_mode)
|
|
{
|
|
case ISC_PASSTHROUGH:
|
|
return TRUE;
|
|
|
|
case ISC_BASICCHECK:
|
|
return TAC_compose_input (prev_char, new_char) != 'R';
|
|
|
|
case ISC_STRICT:
|
|
{
|
|
int op = TAC_compose_input (prev_char, new_char);
|
|
return op != 'R' && op != 'S';
|
|
}
|
|
|
|
default:
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
#define thai_is_composible(n,p) (TAC_compose_input ((p), (n)) == 'C')
|
|
|
|
#ifndef GTK_IM_CONTEXT_THAI_NO_FALLBACK
|
|
static void
|
|
forget_previous_chars (GtkIMContextThai *context_thai)
|
|
{
|
|
memset (context_thai->char_buff, 0, sizeof (context_thai->char_buff));
|
|
}
|
|
|
|
static void
|
|
remember_previous_char (GtkIMContextThai *context_thai, gunichar new_char)
|
|
{
|
|
memmove (context_thai->char_buff + 1, context_thai->char_buff,
|
|
(GTK_IM_CONTEXT_THAI_BUFF_SIZE - 1) * sizeof (context_thai->char_buff[0]));
|
|
context_thai->char_buff[0] = new_char;
|
|
}
|
|
#endif /* !GTK_IM_CONTEXT_THAI_NO_FALLBACK */
|
|
|
|
static gunichar
|
|
get_previous_char (GtkIMContextThai *context_thai, gint offset)
|
|
{
|
|
gchar *surrounding;
|
|
gint cursor_index;
|
|
|
|
if (gtk_im_context_get_surrounding ((GtkIMContext *)context_thai,
|
|
&surrounding, &cursor_index))
|
|
{
|
|
gunichar prev_char;
|
|
gchar *p, *q;
|
|
|
|
prev_char = 0;
|
|
p = surrounding + cursor_index;
|
|
for (q = p; offset < 0 && q > surrounding; ++offset)
|
|
q = g_utf8_prev_char (q);
|
|
if (offset == 0)
|
|
{
|
|
prev_char = g_utf8_get_char_validated (q, p - q);
|
|
if (prev_char == (gunichar)-1 || prev_char == (gunichar)-2)
|
|
prev_char = 0;
|
|
}
|
|
g_free (surrounding);
|
|
return prev_char;
|
|
}
|
|
#ifndef GTK_IM_CONTEXT_THAI_NO_FALLBACK
|
|
else
|
|
{
|
|
offset = -offset - 1;
|
|
if (0 <= offset && offset < GTK_IM_CONTEXT_THAI_BUFF_SIZE)
|
|
return context_thai->char_buff[offset];
|
|
}
|
|
#endif /* !GTK_IM_CONTEXT_THAI_NO_FALLBACK */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static gboolean
|
|
gtk_im_context_thai_commit_chars (GtkIMContextThai *context_thai,
|
|
gunichar *s, gsize len)
|
|
{
|
|
gchar *utf8;
|
|
|
|
utf8 = g_ucs4_to_utf8 (s, len, NULL, NULL, NULL);
|
|
if (!utf8)
|
|
return FALSE;
|
|
|
|
g_signal_emit_by_name (context_thai, "commit", utf8);
|
|
|
|
g_free (utf8);
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
accept_input (GtkIMContextThai *context_thai, gunichar new_char)
|
|
{
|
|
#ifndef GTK_IM_CONTEXT_THAI_NO_FALLBACK
|
|
remember_previous_char (context_thai, new_char);
|
|
#endif /* !GTK_IM_CONTEXT_THAI_NO_FALLBACK */
|
|
|
|
return gtk_im_context_thai_commit_chars (context_thai, &new_char, 1);
|
|
}
|
|
|
|
static gboolean
|
|
reorder_input (GtkIMContextThai *context_thai,
|
|
gunichar prev_char, gunichar new_char)
|
|
{
|
|
gunichar buf[2];
|
|
|
|
if (!gtk_im_context_delete_surrounding (GTK_IM_CONTEXT (context_thai), -1, 1))
|
|
return FALSE;
|
|
|
|
#ifndef GTK_IM_CONTEXT_THAI_NO_FALLBACK
|
|
forget_previous_chars (context_thai);
|
|
remember_previous_char (context_thai, new_char);
|
|
remember_previous_char (context_thai, prev_char);
|
|
#endif /* !GTK_IM_CONTEXT_THAI_NO_FALLBACK */
|
|
|
|
buf[0] = new_char;
|
|
buf[1] = prev_char;
|
|
return gtk_im_context_thai_commit_chars (context_thai, buf, 2);
|
|
}
|
|
|
|
static gboolean
|
|
replace_input (GtkIMContextThai *context_thai, gunichar new_char)
|
|
{
|
|
if (!gtk_im_context_delete_surrounding (GTK_IM_CONTEXT (context_thai), -1, 1))
|
|
return FALSE;
|
|
|
|
#ifndef GTK_IM_CONTEXT_THAI_NO_FALLBACK
|
|
forget_previous_chars (context_thai);
|
|
remember_previous_char (context_thai, new_char);
|
|
#endif /* !GTK_IM_CONTEXT_THAI_NO_FALLBACK */
|
|
|
|
return gtk_im_context_thai_commit_chars (context_thai, &new_char, 1);
|
|
}
|
|
|
|
static gboolean
|
|
gtk_im_context_thai_filter_keypress (GtkIMContext *context,
|
|
GdkEventKey *event)
|
|
{
|
|
GtkIMContextThai *context_thai = GTK_IM_CONTEXT_THAI (context);
|
|
gunichar prev_char, new_char;
|
|
gboolean is_reject;
|
|
GtkIMContextThaiISCMode isc_mode;
|
|
GdkModifierType state;
|
|
guint keyval;
|
|
|
|
if (gdk_event_get_event_type ((GdkEvent *) event) != GDK_KEY_PRESS ||
|
|
!gdk_event_get_state ((GdkEvent *) event, &state) ||
|
|
!gdk_event_get_keyval ((GdkEvent *) event, &keyval))
|
|
return FALSE;
|
|
|
|
if (state & (GDK_MODIFIER_MASK
|
|
& ~(GDK_SHIFT_MASK | GDK_LOCK_MASK | GDK_MOD2_MASK)) ||
|
|
is_context_lost_key (keyval))
|
|
{
|
|
#ifndef GTK_IM_CONTEXT_THAI_NO_FALLBACK
|
|
forget_previous_chars (context_thai);
|
|
#endif /* !GTK_IM_CONTEXT_THAI_NO_FALLBACK */
|
|
return FALSE;
|
|
}
|
|
if (keyval == 0 || is_context_intact_key (keyval))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
prev_char = get_previous_char (context_thai, -1);
|
|
if (!prev_char)
|
|
prev_char = ' ';
|
|
new_char = gdk_keyval_to_unicode (keyval);
|
|
is_reject = TRUE;
|
|
isc_mode = gtk_im_context_thai_get_isc_mode (context_thai);
|
|
if (thai_is_accept (new_char, prev_char, isc_mode))
|
|
{
|
|
accept_input (context_thai, new_char);
|
|
is_reject = FALSE;
|
|
}
|
|
else
|
|
{
|
|
gunichar context_char;
|
|
|
|
/* rejected, trying to correct */
|
|
context_char = get_previous_char (context_thai, -2);
|
|
if (context_char)
|
|
{
|
|
if (thai_is_composible (new_char, context_char))
|
|
{
|
|
if (thai_is_composible (prev_char, new_char))
|
|
is_reject = !reorder_input (context_thai, prev_char, new_char);
|
|
else if (thai_is_composible (prev_char, context_char))
|
|
is_reject = !replace_input (context_thai, new_char);
|
|
else if ((TAC_char_class (prev_char) == FV1
|
|
|| TAC_char_class (prev_char) == AM)
|
|
&& TAC_char_class (new_char) == TONE)
|
|
is_reject = !reorder_input (context_thai, prev_char, new_char);
|
|
}
|
|
else if (thai_is_accept (new_char, context_char, isc_mode))
|
|
is_reject = !replace_input (context_thai, new_char);
|
|
}
|
|
}
|
|
if (is_reject)
|
|
{
|
|
/* reject character */
|
|
gdk_beep ();
|
|
}
|
|
return TRUE;
|
|
}
|
|
|