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gtk2/gtk/gtkimcontextxim.c
Emmanuele Bassi 6fa2c7e3b7 xim: Use NULL-safe string comparison 
The locale string may be NULL.
2018-03-01 16:44:02 +07:00

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/* 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 "locale.h"
#include <string.h>
#include <stdlib.h>
#include "gtkimcontextxim.h"
#include "gtkimmodule.h"
#include "gtk/gtkintl.h"
typedef struct _StatusWindow StatusWindow;
typedef struct _GtkXIMInfo GtkXIMInfo;
struct _GtkIMContextXIM
{
GtkIMContext object;
GtkXIMInfo *im_info;
gchar *locale;
gchar *mb_charset;
GdkWindow *client_window;
Window client_window_xid;
GtkWidget *client_widget;
/* The status window for this input context; we claim the
* status window when we are focused and have created an XIC
*/
StatusWindow *status_window;
gint preedit_size;
gint preedit_length;
gunichar *preedit_chars;
XIMFeedback *feedbacks;
gint preedit_cursor;
XIMCallback preedit_start_callback;
XIMCallback preedit_done_callback;
XIMCallback preedit_draw_callback;
XIMCallback preedit_caret_callback;
XIMCallback status_start_callback;
XIMCallback status_done_callback;
XIMCallback status_draw_callback;
XIMCallback string_conversion_callback;
XIC ic;
guint filter_key_release : 1;
guint use_preedit : 1;
guint finalizing : 1;
guint in_toplevel : 1;
guint has_focus : 1;
};
struct _GtkXIMInfo
{
GdkDisplay *display;
XIM im;
char *locale;
XIMStyle preedit_style_setting;
XIMStyle status_style_setting;
XIMStyle style;
GtkSettings *settings;
gulong status_set;
gulong preedit_set;
gulong display_closed_cb;
XIMStyles *xim_styles;
GSList *ics;
guint reconnecting :1;
guint supports_string_conversion;
};
/* A context status window; these are kept in the status_windows list. */
struct _StatusWindow
{
GtkWidget *window;
/* Toplevel window to which the status window corresponds */
GtkWidget *toplevel;
/* Currently focused GtkIMContextXIM for the toplevel, if any */
GtkIMContextXIM *context;
};
static void gtk_im_context_xim_finalize (GObject *obj);
static void gtk_im_context_xim_set_client_widget (GtkIMContext *context,
GtkWidget *widget);
static gboolean gtk_im_context_xim_filter_keypress (GtkIMContext *context,
GdkEventKey *key);
static void gtk_im_context_xim_reset (GtkIMContext *context);
static void gtk_im_context_xim_focus_in (GtkIMContext *context);
static void gtk_im_context_xim_focus_out (GtkIMContext *context);
static void gtk_im_context_xim_set_cursor_location (GtkIMContext *context,
GdkRectangle *area);
static void gtk_im_context_xim_set_use_preedit (GtkIMContext *context,
gboolean use_preedit);
static void gtk_im_context_xim_get_preedit_string (GtkIMContext *context,
gchar **str,
PangoAttrList **attrs,
gint *cursor_pos);
static void reinitialize_ic (GtkIMContextXIM *context_xim);
static void set_ic_client_window (GtkIMContextXIM *context_xim,
GdkWindow *client_window);
static void setup_styles (GtkXIMInfo *info);
static void update_client_widget (GtkIMContextXIM *context_xim);
static void update_status_window (GtkIMContextXIM *context_xim);
static StatusWindow *status_window_get (GtkWidget *toplevel);
static void status_window_free (StatusWindow *status_window);
static void status_window_set_text (StatusWindow *status_window,
const gchar *text);
static void xim_destroy_callback (XIM xim,
XPointer client_data,
XPointer call_data);
static XIC gtk_im_context_xim_get_ic (GtkIMContextXIM *context_xim);
static void xim_info_display_closed (GdkDisplay *display,
gboolean is_error,
GtkXIMInfo *info);
G_DEFINE_TYPE_WITH_CODE (GtkIMContextXIM, gtk_im_context_xim, GTK_TYPE_IM_CONTEXT,
g_io_extension_point_implement (GTK_IM_MODULE_EXTENSION_POINT_NAME,
g_define_type_id,
"xim",
10))
static GSList *open_ims = NULL;
/* List of status windows for different toplevels */
static GSList *status_windows = NULL;
#define PREEDIT_MASK (XIMPreeditCallbacks | XIMPreeditPosition | \
XIMPreeditArea | XIMPreeditNothing | XIMPreeditNone)
#define STATUS_MASK (XIMStatusCallbacks | XIMStatusArea | \
XIMStatusNothing | XIMStatusNone)
#define ALLOWED_MASK (XIMPreeditCallbacks | XIMPreeditNothing | XIMPreeditNone | \
XIMStatusCallbacks | XIMStatusNothing | XIMStatusNone)
static XIMStyle
choose_better_style (XIMStyle style1, XIMStyle style2)
{
XIMStyle s1, s2, u;
if (style1 == 0) return style2;
if (style2 == 0) return style1;
if ((style1 & (PREEDIT_MASK | STATUS_MASK))
== (style2 & (PREEDIT_MASK | STATUS_MASK)))
return style1;
s1 = style1 & PREEDIT_MASK;
s2 = style2 & PREEDIT_MASK;
u = s1 | s2;
if (s1 != s2) {
if (u & XIMPreeditCallbacks)
return (s1 == XIMPreeditCallbacks) ? style1 : style2;
else if (u & XIMPreeditPosition)
return (s1 == XIMPreeditPosition) ? style1 :style2;
else if (u & XIMPreeditArea)
return (s1 == XIMPreeditArea) ? style1 : style2;
else if (u & XIMPreeditNothing)
return (s1 == XIMPreeditNothing) ? style1 : style2;
else if (u & XIMPreeditNone)
return (s1 == XIMPreeditNone) ? style1 : style2;
} else {
s1 = style1 & STATUS_MASK;
s2 = style2 & STATUS_MASK;
u = s1 | s2;
if (u & XIMStatusCallbacks)
return (s1 == XIMStatusCallbacks) ? style1 : style2;
else if (u & XIMStatusArea)
return (s1 == XIMStatusArea) ? style1 : style2;
else if (u & XIMStatusNothing)
return (s1 == XIMStatusNothing) ? style1 : style2;
else if (u & XIMStatusNone)
return (s1 == XIMStatusNone) ? style1 : style2;
}
return 0; /* Get rid of stupid warning */
}
static void
reinitialize_all_ics (GtkXIMInfo *info)
{
GSList *tmp_list;
for (tmp_list = info->ics; tmp_list; tmp_list = tmp_list->next)
reinitialize_ic (tmp_list->data);
}
static void
setup_styles (GtkXIMInfo *info)
{
int i;
unsigned long settings_preference;
XIMStyles *xim_styles = info->xim_styles;
settings_preference = info->status_style_setting|info->preedit_style_setting;
info->style = 0;
if (xim_styles)
{
for (i = 0; i < xim_styles->count_styles; i++)
if ((xim_styles->supported_styles[i] & ALLOWED_MASK) == xim_styles->supported_styles[i])
{
if (settings_preference == xim_styles->supported_styles[i])
{
info->style = settings_preference;
break;
}
info->style = choose_better_style (info->style,
xim_styles->supported_styles[i]);
}
}
if (info->style == 0)
info->style = XIMPreeditNothing | XIMStatusNothing;
}
static void
setup_im (GtkXIMInfo *info)
{
XIMValuesList *ic_values = NULL;
XIMCallback im_destroy_callback;
GdkDisplay *display;
if (info->im == NULL)
return;
im_destroy_callback.client_data = (XPointer)info;
im_destroy_callback.callback = (XIMProc)xim_destroy_callback;
XSetIMValues (info->im,
XNDestroyCallback, &im_destroy_callback,
NULL);
XGetIMValues (info->im,
XNQueryInputStyle, &info->xim_styles,
XNQueryICValuesList, &ic_values,
NULL);
info->supports_string_conversion = FALSE;
if (ic_values)
{
int i;
for (i = 0; i < ic_values->count_values; i++)
if (strcmp (ic_values->supported_values[i],
XNStringConversionCallback) == 0)
{
info->supports_string_conversion = TRUE;
break;
}
#if 0
for (i = 0; i < ic_values->count_values; i++)
g_print ("%s\n", ic_values->supported_values[i]);
for (i = 0; i < xim_styles->count_styles; i++)
g_print ("%#x\n", xim_styles->supported_styles[i]);
#endif
XFree (ic_values);
}
info->status_style_setting = XIMStatusCallbacks;
info->preedit_style_setting = XIMPreeditCallbacks;
setup_styles (info);
reinitialize_all_ics (info);
display = info->display;
info->display_closed_cb = g_signal_connect (display, "closed",
G_CALLBACK (xim_info_display_closed), info);
}
static void
xim_info_display_closed (GdkDisplay *display,
gboolean is_error,
GtkXIMInfo *info)
{
GSList *ics, *tmp_list;
open_ims = g_slist_remove (open_ims, info);
ics = info->ics;
info->ics = NULL;
for (tmp_list = ics; tmp_list; tmp_list = tmp_list->next)
set_ic_client_window (tmp_list->data, NULL);
g_slist_free (ics);
if (info->status_set)
g_signal_handler_disconnect (info->settings, info->status_set);
if (info->preedit_set)
g_signal_handler_disconnect (info->settings, info->preedit_set);
if (info->display_closed_cb)
g_signal_handler_disconnect (display, info->display_closed_cb);
if (info->xim_styles)
XFree (info->xim_styles);
g_free (info->locale);
if (info->im)
XCloseIM (info->im);
g_free (info);
}
static void
xim_instantiate_callback (Display *display, XPointer client_data,
XPointer call_data)
{
GtkXIMInfo *info = (GtkXIMInfo*)client_data;
XIM im = NULL;
im = XOpenIM (display, NULL, NULL, NULL);
if (!im)
return;
info->im = im;
setup_im (info);
XUnregisterIMInstantiateCallback (display, NULL, NULL, NULL,
xim_instantiate_callback,
(XPointer)info);
info->reconnecting = FALSE;
}
/* initialize info->im */
static void
xim_info_try_im (GtkXIMInfo *info)
{
GdkDisplay *display = info->display;
g_assert (info->im == NULL);
if (info->reconnecting)
return;
if (XSupportsLocale ())
{
if (!XSetLocaleModifiers (""))
g_warning ("Unable to set locale modifiers with XSetLocaleModifiers()");
info->im = XOpenIM (GDK_DISPLAY_XDISPLAY (display), NULL, NULL, NULL);
if (!info->im)
{
XRegisterIMInstantiateCallback (GDK_DISPLAY_XDISPLAY(display),
NULL, NULL, NULL,
xim_instantiate_callback,
(XPointer)info);
info->reconnecting = TRUE;
return;
}
setup_im (info);
}
}
static void
xim_destroy_callback (XIM xim,
XPointer client_data,
XPointer call_data)
{
GtkXIMInfo *info = (GtkXIMInfo*)client_data;
info->im = NULL;
g_signal_handler_disconnect (info->settings, info->status_set);
info->status_set = 0;
g_signal_handler_disconnect (info->settings, info->preedit_set);
info->preedit_set = 0;
reinitialize_all_ics (info);
xim_info_try_im (info);
return;
}
static GtkXIMInfo *
get_im (GdkWindow *client_window,
const char *locale)
{
GSList *tmp_list;
GtkXIMInfo *info;
GdkDisplay *display = gdk_window_get_display (client_window);
info = NULL;
tmp_list = open_ims;
while (tmp_list)
{
GtkXIMInfo *tmp_info = tmp_list->data;
if (tmp_info->display == display &&
g_strcmp0 (tmp_info->locale, locale) == 0)
{
if (tmp_info->im)
{
return tmp_info;
}
else
{
tmp_info = tmp_info;
break;
}
}
tmp_list = tmp_list->next;
}
if (info == NULL)
{
info = g_new (GtkXIMInfo, 1);
open_ims = g_slist_prepend (open_ims, info);
info->display = display;
info->locale = g_strdup (locale);
info->xim_styles = NULL;
info->preedit_style_setting = 0;
info->status_style_setting = 0;
info->settings = NULL;
info->preedit_set = 0;
info->status_set = 0;
info->display_closed_cb = 0;
info->ics = NULL;
info->reconnecting = FALSE;
info->im = NULL;
}
xim_info_try_im (info);
return info;
}
static void
gtk_im_context_xim_class_init (GtkIMContextXIMClass *class)
{
GtkIMContextClass *im_context_class = GTK_IM_CONTEXT_CLASS (class);
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
im_context_class->set_client_widget = gtk_im_context_xim_set_client_widget;
im_context_class->filter_keypress = gtk_im_context_xim_filter_keypress;
im_context_class->reset = gtk_im_context_xim_reset;
im_context_class->get_preedit_string = gtk_im_context_xim_get_preedit_string;
im_context_class->focus_in = gtk_im_context_xim_focus_in;
im_context_class->focus_out = gtk_im_context_xim_focus_out;
im_context_class->set_cursor_location = gtk_im_context_xim_set_cursor_location;
im_context_class->set_use_preedit = gtk_im_context_xim_set_use_preedit;
gobject_class->finalize = gtk_im_context_xim_finalize;
}
static void
gtk_im_context_xim_init (GtkIMContextXIM *im_context_xim)
{
im_context_xim->use_preedit = TRUE;
im_context_xim->filter_key_release = FALSE;
im_context_xim->finalizing = FALSE;
im_context_xim->has_focus = FALSE;
im_context_xim->in_toplevel = FALSE;
}
static void
gtk_im_context_xim_finalize (GObject *obj)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (obj);
context_xim->finalizing = TRUE;
if (context_xim->im_info && !context_xim->im_info->ics->next)
{
if (context_xim->im_info->reconnecting)
{
GdkDisplay *display;
display = context_xim->im_info->display;
XUnregisterIMInstantiateCallback (GDK_DISPLAY_XDISPLAY (display),
NULL, NULL, NULL,
xim_instantiate_callback,
(XPointer)context_xim->im_info);
}
else if (context_xim->im_info->im)
{
XIMCallback im_destroy_callback;
im_destroy_callback.client_data = NULL;
im_destroy_callback.callback = NULL;
XSetIMValues (context_xim->im_info->im,
XNDestroyCallback, &im_destroy_callback,
NULL);
}
}
set_ic_client_window (context_xim, NULL);
g_free (context_xim->locale);
g_free (context_xim->mb_charset);
G_OBJECT_CLASS (gtk_im_context_xim_parent_class)->finalize (obj);
}
static void
reinitialize_ic (GtkIMContextXIM *context_xim)
{
if (context_xim->ic)
{
XDestroyIC (context_xim->ic);
context_xim->ic = NULL;
update_status_window (context_xim);
if (context_xim->preedit_length)
{
context_xim->preedit_length = 0;
if (!context_xim->finalizing)
g_signal_emit_by_name (context_xim, "preedit-changed");
}
}
/*
reset filter_key_release flag, otherwise keystrokes will be doubled
until reconnecting to XIM.
*/
context_xim->filter_key_release = FALSE;
}
static void
set_ic_client_window (GtkIMContextXIM *context_xim,
GdkWindow *client_window)
{
reinitialize_ic (context_xim);
if (context_xim->client_window)
{
context_xim->im_info->ics = g_slist_remove (context_xim->im_info->ics, context_xim);
context_xim->im_info = NULL;
}
context_xim->client_window = client_window;
context_xim->client_window_xid = None;
if (context_xim->client_window)
{
GdkWindow *native;
context_xim->im_info = get_im (context_xim->client_window, context_xim->locale);
context_xim->im_info->ics = g_slist_prepend (context_xim->im_info->ics, context_xim);
for (native = client_window; native; native = gdk_window_get_parent (native))
{
if (gdk_window_has_native (native))
{
context_xim->client_window_xid = gdk_x11_window_get_xid (native);
break;
}
}
}
update_client_widget (context_xim);
}
static void
gtk_im_context_xim_set_client_widget (GtkIMContext *context,
GtkWidget *widget)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
set_ic_client_window (context_xim, gtk_widget_get_window (toplevel));
}
GtkIMContext *
gtk_im_context_xim_new (void)
{
GtkIMContextXIM *result;
const gchar *charset;
if (!GDK_IS_X11_DISPLAY(gdk_display_get_default()))
return NULL;
result = g_object_new (GTK_TYPE_IM_CONTEXT_XIM, NULL);
result->locale = g_strdup (setlocale (LC_CTYPE, NULL));
g_get_charset (&charset);
result->mb_charset = g_strdup (charset);
return GTK_IM_CONTEXT (result);
}
static char *
mb_to_utf8 (GtkIMContextXIM *context_xim,
const char *str)
{
GError *error = NULL;
gchar *result;
if (strcmp (context_xim->mb_charset, "UTF-8") == 0)
result = g_strdup (str);
else
{
result = g_convert (str, -1,
"UTF-8", context_xim->mb_charset,
NULL, NULL, &error);
if (!result)
{
g_warning ("Error converting text from IM to UTF-8: %s\n", error->message);
g_error_free (error);
}
}
return result;
}
static gboolean
gtk_im_context_xim_filter_keypress (GtkIMContext *context,
GdkEventKey *event)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
XIC ic = gtk_im_context_xim_get_ic (context_xim);
gchar static_buffer[256];
gchar *buffer = static_buffer;
gint buffer_size = sizeof(static_buffer) - 1;
gint num_bytes = 0;
KeySym keysym;
Status status;
gboolean result = FALSE;
GdkWindow *window;
XKeyPressedEvent xevent;
GdkEventType event_type;
guint state;
event_type = gdk_event_get_event_type ((GdkEvent *) event);
if (!gdk_event_get_state ((GdkEvent *) event, &state))
return GDK_EVENT_PROPAGATE;
if (event_type == GDK_KEY_RELEASE && !context_xim->filter_key_release)
return FALSE;
window = gdk_window_get_toplevel (gdk_event_get_window ((GdkEvent *) event));
xevent.type = (event_type == GDK_KEY_PRESS) ? KeyPress : KeyRelease;
xevent.serial = 0; /* hope it doesn't matter */
xevent.send_event = gdk_event_is_sent ((GdkEvent *)event);
xevent.display = GDK_WINDOW_XDISPLAY (window);
xevent.window = GDK_WINDOW_XID (window);
xevent.root = DefaultRootWindow(GDK_WINDOW_XDISPLAY (window));
xevent.subwindow = xevent.window;
xevent.time = gdk_event_get_time ((GdkEvent *) event);
xevent.x = xevent.x_root = 0;
xevent.y = xevent.y_root = 0;
xevent.state = state;
xevent.keycode = gdk_event_get_scancode ((GdkEvent *) event);
xevent.same_screen = True;
if (XFilterEvent ((XEvent *)&xevent, context_xim->client_window_xid))
return TRUE;
if (state &
(gtk_accelerator_get_default_mod_mask () & ~(GDK_SHIFT_MASK | GDK_CONTROL_MASK)))
return FALSE;
again:
if (ic)
num_bytes = XmbLookupString (ic, &xevent, buffer, buffer_size, &keysym, &status);
else
{
num_bytes = XLookupString (&xevent, buffer, buffer_size, &keysym, NULL);
status = XLookupBoth;
}
if (status == XBufferOverflow)
{
buffer_size = num_bytes;
if (buffer != static_buffer)
g_free (buffer);
buffer = g_malloc (num_bytes + 1);
goto again;
}
/* I don't know how we should properly handle XLookupKeysym or XLookupBoth
* here ... do input methods actually change the keysym? we can't really
* feed it back to accelerator processing at this point...
*/
if (status == XLookupChars || status == XLookupBoth)
{
char *result_utf8;
buffer[num_bytes] = '\0';
result_utf8 = mb_to_utf8 (context_xim, buffer);
if (result_utf8)
{
if ((guchar)result_utf8[0] >= 0x20 &&
result_utf8[0] != 0x7f) /* Some IM have a nasty habit of converting
* control characters into strings
*/
{
g_signal_emit_by_name (context, "commit", result_utf8);
result = TRUE;
}
g_free (result_utf8);
}
}
if (buffer != static_buffer)
g_free (buffer);
return result;
}
static void
gtk_im_context_xim_focus_in (GtkIMContext *context)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
if (!context_xim->has_focus)
{
XIC ic = gtk_im_context_xim_get_ic (context_xim);
context_xim->has_focus = TRUE;
update_status_window (context_xim);
if (ic)
XSetICFocus (ic);
}
return;
}
static void
gtk_im_context_xim_focus_out (GtkIMContext *context)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
if (context_xim->has_focus)
{
XIC ic = gtk_im_context_xim_get_ic (context_xim);
context_xim->has_focus = FALSE;
update_status_window (context_xim);
if (ic)
XUnsetICFocus (ic);
}
return;
}
static void
gtk_im_context_xim_set_cursor_location (GtkIMContext *context,
GdkRectangle *area)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
XIC ic = gtk_im_context_xim_get_ic (context_xim);
XVaNestedList preedit_attr;
XPoint spot;
if (!ic)
return;
spot.x = area->x;
spot.y = area->y + area->height;
preedit_attr = XVaCreateNestedList (0,
XNSpotLocation, &spot,
NULL);
XSetICValues (ic,
XNPreeditAttributes, preedit_attr,
NULL);
XFree(preedit_attr);
return;
}
static void
gtk_im_context_xim_set_use_preedit (GtkIMContext *context,
gboolean use_preedit)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
use_preedit = use_preedit != FALSE;
if (context_xim->use_preedit != use_preedit)
{
context_xim->use_preedit = use_preedit;
reinitialize_ic (context_xim);
}
return;
}
static void
gtk_im_context_xim_reset (GtkIMContext *context)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
XIC ic = gtk_im_context_xim_get_ic (context_xim);
gchar *result;
/* restore conversion state after resetting ic later */
XIMPreeditState preedit_state = XIMPreeditUnKnown;
XVaNestedList preedit_attr;
gboolean have_preedit_state = FALSE;
if (!ic)
return;
if (context_xim->preedit_length == 0)
return;
preedit_attr = XVaCreateNestedList(0,
XNPreeditState, &preedit_state,
NULL);
if (!XGetICValues(ic,
XNPreeditAttributes, preedit_attr,
NULL))
have_preedit_state = TRUE;
XFree(preedit_attr);
result = XmbResetIC (ic);
preedit_attr = XVaCreateNestedList(0,
XNPreeditState, preedit_state,
NULL);
if (have_preedit_state)
XSetICValues(ic,
XNPreeditAttributes, preedit_attr,
NULL);
XFree(preedit_attr);
if (result)
{
char *result_utf8 = mb_to_utf8 (context_xim, result);
if (result_utf8)
{
g_signal_emit_by_name (context, "commit", result_utf8);
g_free (result_utf8);
}
}
if (context_xim->preedit_length)
{
context_xim->preedit_length = 0;
g_signal_emit_by_name (context, "preedit-changed");
}
XFree (result);
}
/* Mask of feedback bits that we render
*/
#define FEEDBACK_MASK (XIMReverse | XIMUnderline)
static void
add_feedback_attr (PangoAttrList *attrs,
const gchar *str,
XIMFeedback feedback,
gint start_pos,
gint end_pos)
{
PangoAttribute *attr;
gint start_index = g_utf8_offset_to_pointer (str, start_pos) - str;
gint end_index = g_utf8_offset_to_pointer (str, end_pos) - str;
if (feedback & XIMUnderline)
{
attr = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
attr->start_index = start_index;
attr->end_index = end_index;
pango_attr_list_change (attrs, attr);
}
if (feedback & XIMReverse)
{
attr = pango_attr_foreground_new (0xffff, 0xffff, 0xffff);
attr->start_index = start_index;
attr->end_index = end_index;
pango_attr_list_change (attrs, attr);
attr = pango_attr_background_new (0, 0, 0);
attr->start_index = start_index;
attr->end_index = end_index;
pango_attr_list_change (attrs, attr);
}
if (feedback & ~FEEDBACK_MASK)
g_warning ("Unrendered feedback style: %#lx", feedback & ~FEEDBACK_MASK);
}
static void
gtk_im_context_xim_get_preedit_string (GtkIMContext *context,
gchar **str,
PangoAttrList **attrs,
gint *cursor_pos)
{
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
gchar *utf8 = g_ucs4_to_utf8 (context_xim->preedit_chars, context_xim->preedit_length, NULL, NULL, NULL);
if (attrs)
{
int i;
XIMFeedback last_feedback = 0;
gint start = -1;
*attrs = pango_attr_list_new ();
for (i = 0; i < context_xim->preedit_length; i++)
{
XIMFeedback new_feedback = context_xim->feedbacks[i] & FEEDBACK_MASK;
if (new_feedback != last_feedback)
{
if (start >= 0)
add_feedback_attr (*attrs, utf8, last_feedback, start, i);
last_feedback = new_feedback;
start = i;
}
}
if (start >= 0)
add_feedback_attr (*attrs, utf8, last_feedback, start, i);
}
if (str)
*str = utf8;
else
g_free (utf8);
if (cursor_pos)
*cursor_pos = context_xim->preedit_cursor;
}
static int
preedit_start_callback (XIC xic,
XPointer client_data,
XPointer call_data)
{
GtkIMContext *context = GTK_IM_CONTEXT (client_data);
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
if (!context_xim->finalizing)
g_signal_emit_by_name (context, "preedit-start");
return -1; /* No length limit */
}
static void
preedit_done_callback (XIC xic,
XPointer client_data,
XPointer call_data)
{
GtkIMContext *context = GTK_IM_CONTEXT (client_data);
GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
if (context_xim->preedit_length)
{
context_xim->preedit_length = 0;
if (!context_xim->finalizing)
g_signal_emit_by_name (context_xim, "preedit-changed");
}
if (!context_xim->finalizing)
g_signal_emit_by_name (context, "preedit-end");
}
static gint
xim_text_to_utf8 (GtkIMContextXIM *context, XIMText *xim_text, gchar **text)
{
gint text_length = 0;
GError *error = NULL;
gchar *result = NULL;
if (xim_text && xim_text->string.multi_byte)
{
if (xim_text->encoding_is_wchar)
{
g_warning ("Wide character return from Xlib not currently supported");
*text = NULL;
return 0;
}
if (strcmp (context->mb_charset, "UTF-8") == 0)
result = g_strdup (xim_text->string.multi_byte);
else
result = g_convert (xim_text->string.multi_byte,
-1,
"UTF-8",
context->mb_charset,
NULL, NULL, &error);
if (result)
{
text_length = g_utf8_strlen (result, -1);
if (text_length != xim_text->length)
{
g_warning ("Size mismatch when converting text from input method: supplied length = %d\n, result length = %d", xim_text->length, text_length);
}
}
else
{
g_warning ("Error converting text from IM to UCS-4: %s", error->message);
g_error_free (error);
*text = NULL;
return 0;
}
*text = result;
return text_length;
}
else
{
*text = NULL;
return 0;
}
}
static void
preedit_draw_callback (XIC xic,
XPointer client_data,
XIMPreeditDrawCallbackStruct *call_data)
{
GtkIMContextXIM *context = GTK_IM_CONTEXT_XIM (client_data);
XIMText *new_xim_text = call_data->text;
gint new_text_length;
gunichar *new_text = NULL;
gint i;
gint diff;
gint new_length;
gchar *tmp;
gint chg_first = CLAMP (call_data->chg_first, 0, context->preedit_length);
gint chg_length = CLAMP (call_data->chg_length, 0, context->preedit_length - chg_first);
context->preedit_cursor = call_data->caret;
if (chg_first != call_data->chg_first || chg_length != call_data->chg_length)
g_warning ("Invalid change to preedit string, first=%d length=%d (orig length == %d)",
call_data->chg_first, call_data->chg_length, context->preedit_length);
new_text_length = xim_text_to_utf8 (context, new_xim_text, &tmp);
if (tmp)
{
new_text = g_utf8_to_ucs4_fast (tmp, -1, NULL);
g_free (tmp);
}
diff = new_text_length - chg_length;
new_length = context->preedit_length + diff;
if (new_length > context->preedit_size)
{
context->preedit_size = new_length;
context->preedit_chars = g_renew (gunichar, context->preedit_chars, new_length);
context->feedbacks = g_renew (XIMFeedback, context->feedbacks, new_length);
}
if (diff < 0)
{
for (i = chg_first + chg_length ; i < context->preedit_length; i++)
{
context->preedit_chars[i + diff] = context->preedit_chars[i];
context->feedbacks[i + diff] = context->feedbacks[i];
}
}
else
{
for (i = context->preedit_length - 1; i >= chg_first + chg_length ; i--)
{
context->preedit_chars[i + diff] = context->preedit_chars[i];
context->feedbacks[i + diff] = context->feedbacks[i];
}
}
for (i = 0; i < new_text_length; i++)
{
context->preedit_chars[chg_first + i] = new_text[i];
context->feedbacks[chg_first + i] = new_xim_text->feedback[i];
}
context->preedit_length += diff;
g_free (new_text);
if (!context->finalizing)
g_signal_emit_by_name (context, "preedit-changed");
}
static void
preedit_caret_callback (XIC xic,
XPointer client_data,
XIMPreeditCaretCallbackStruct *call_data)
{
GtkIMContextXIM *context = GTK_IM_CONTEXT_XIM (client_data);
if (call_data->direction == XIMAbsolutePosition)
{
context->preedit_cursor = call_data->position;
if (!context->finalizing)
g_signal_emit_by_name (context, "preedit-changed");
}
else
{
g_warning ("Caret movement command: %d %d %d not supported",
call_data->position, call_data->direction, call_data->style);
}
}
static void
status_start_callback (XIC xic,
XPointer client_data,
XPointer call_data)
{
return;
}
static void
status_done_callback (XIC xic,
XPointer client_data,
XPointer call_data)
{
return;
}
static void
status_draw_callback (XIC xic,
XPointer client_data,
XIMStatusDrawCallbackStruct *call_data)
{
GtkIMContextXIM *context = GTK_IM_CONTEXT_XIM (client_data);
if (call_data->type == XIMTextType)
{
gchar *text;
xim_text_to_utf8 (context, call_data->data.text, &text);
if (context->status_window)
status_window_set_text (context->status_window, text ? text : "");
}
else /* bitmap */
{
g_print ("Status drawn with bitmap - id = %#lx\n", call_data->data.bitmap);
}
}
static void
string_conversion_callback (XIC xic, XPointer client_data, XPointer call_data)
{
GtkIMContextXIM *context_xim;
XIMStringConversionCallbackStruct *conv_data;
gchar *surrounding;
gint cursor_index;
context_xim = (GtkIMContextXIM *)client_data;
conv_data = (XIMStringConversionCallbackStruct *)call_data;
if (gtk_im_context_get_surrounding ((GtkIMContext *)context_xim,
&surrounding, &cursor_index))
{
gchar *text = NULL;
gsize text_len = 0;
gint subst_offset = 0, subst_nchars = 0;
gint i;
gchar *p = surrounding + cursor_index, *q;
gshort position = (gshort)conv_data->position;
if (position > 0)
{
for (i = position; i > 0 && *p; --i)
p = g_utf8_next_char (p);
if (i > 0)
return;
}
/* According to X11R6.4 Xlib - C Library Reference Manual
* section 13.5.7.3 String Conversion Callback,
* XIMStringConversionPosition is starting position _relative_
* to current client's cursor position. So it should be able
* to be negative, or referring to a position before the cursor
* would be impossible. But current X protocol defines this as
* unsigned short. So, compiler may warn about the value range
* here. We hope the X protocol is fixed soon.
*/
else if (position < 0)
{
for (i = position; i < 0 && p > surrounding; ++i)
p = g_utf8_prev_char (p);
if (i < 0)
return;
}
switch (conv_data->direction)
{
case XIMForwardChar:
for (i = conv_data->factor, q = p; i > 0 && *q; --i)
q = g_utf8_next_char (q);
if (i > 0)
break;
text = g_locale_from_utf8 (p, q - p, NULL, &text_len, NULL);
subst_offset = position;
subst_nchars = conv_data->factor;
break;
case XIMBackwardChar:
for (i = conv_data->factor, q = p; i > 0 && q > surrounding; --i)
q = g_utf8_prev_char (q);
if (i > 0)
break;
text = g_locale_from_utf8 (q, p - q, NULL, &text_len, NULL);
subst_offset = position - conv_data->factor;
subst_nchars = conv_data->factor;
break;
case XIMForwardWord:
case XIMBackwardWord:
case XIMCaretUp:
case XIMCaretDown:
case XIMNextLine:
case XIMPreviousLine:
case XIMLineStart:
case XIMLineEnd:
case XIMAbsolutePosition:
case XIMDontChange:
default:
break;
}
/* block out any failure happenning to "text", including conversion */
if (text)
{
conv_data->text = (XIMStringConversionText *)
malloc (sizeof (XIMStringConversionText));
if (conv_data->text)
{
conv_data->text->length = text_len;
conv_data->text->feedback = NULL;
conv_data->text->encoding_is_wchar = False;
conv_data->text->string.mbs = (char *)malloc (text_len);
if (conv_data->text->string.mbs)
memcpy (conv_data->text->string.mbs, text, text_len);
else
{
free (conv_data->text);
conv_data->text = NULL;
}
}
g_free (text);
}
if (conv_data->operation == XIMStringConversionSubstitution
&& subst_nchars > 0)
{
gtk_im_context_delete_surrounding ((GtkIMContext *)context_xim,
subst_offset, subst_nchars);
}
g_free (surrounding);
}
}
static XVaNestedList
set_preedit_callback (GtkIMContextXIM *context_xim)
{
context_xim->preedit_start_callback.client_data = (XPointer)context_xim;
context_xim->preedit_start_callback.callback = (XIMProc)preedit_start_callback;
context_xim->preedit_done_callback.client_data = (XPointer)context_xim;
context_xim->preedit_done_callback.callback = (XIMProc)preedit_done_callback;
context_xim->preedit_draw_callback.client_data = (XPointer)context_xim;
context_xim->preedit_draw_callback.callback = (XIMProc)preedit_draw_callback;
context_xim->preedit_caret_callback.client_data = (XPointer)context_xim;
context_xim->preedit_caret_callback.callback = (XIMProc)preedit_caret_callback;
return XVaCreateNestedList (0,
XNPreeditStartCallback, &context_xim->preedit_start_callback,
XNPreeditDoneCallback, &context_xim->preedit_done_callback,
XNPreeditDrawCallback, &context_xim->preedit_draw_callback,
XNPreeditCaretCallback, &context_xim->preedit_caret_callback,
NULL);
}
static XVaNestedList
set_status_callback (GtkIMContextXIM *context_xim)
{
context_xim->status_start_callback.client_data = (XPointer)context_xim;
context_xim->status_start_callback.callback = (XIMProc)status_start_callback;
context_xim->status_done_callback.client_data = (XPointer)context_xim;
context_xim->status_done_callback.callback = (XIMProc)status_done_callback;
context_xim->status_draw_callback.client_data = (XPointer)context_xim;
context_xim->status_draw_callback.callback = (XIMProc)status_draw_callback;
return XVaCreateNestedList (0,
XNStatusStartCallback, &context_xim->status_start_callback,
XNStatusDoneCallback, &context_xim->status_done_callback,
XNStatusDrawCallback, &context_xim->status_draw_callback,
NULL);
}
static void
set_string_conversion_callback (GtkIMContextXIM *context_xim, XIC xic)
{
if (!context_xim->im_info->supports_string_conversion)
return;
context_xim->string_conversion_callback.client_data = (XPointer)context_xim;
context_xim->string_conversion_callback.callback = (XIMProc)string_conversion_callback;
XSetICValues (xic,
XNStringConversionCallback,
(XPointer)&context_xim->string_conversion_callback,
NULL);
}
static XIC
gtk_im_context_xim_get_ic (GtkIMContextXIM *context_xim)
{
if (context_xim->im_info == NULL || context_xim->im_info->im == NULL)
return NULL;
if (!context_xim->ic)
{
const char *name1 = NULL;
XVaNestedList list1 = NULL;
const char *name2 = NULL;
XVaNestedList list2 = NULL;
XIMStyle im_style = 0;
XIC xic = NULL;
if (context_xim->use_preedit &&
(context_xim->im_info->style & PREEDIT_MASK) == XIMPreeditCallbacks)
{
im_style |= XIMPreeditCallbacks;
name1 = XNPreeditAttributes;
list1 = set_preedit_callback (context_xim);
}
else if ((context_xim->im_info->style & PREEDIT_MASK) == XIMPreeditNone)
im_style |= XIMPreeditNone;
else
im_style |= XIMPreeditNothing;
if ((context_xim->im_info->style & STATUS_MASK) == XIMStatusCallbacks)
{
im_style |= XIMStatusCallbacks;
if (name1 == NULL)
{
name1 = XNStatusAttributes;
list1 = set_status_callback (context_xim);
}
else
{
name2 = XNStatusAttributes;
list2 = set_status_callback (context_xim);
}
}
else if ((context_xim->im_info->style & STATUS_MASK) == XIMStatusNone)
im_style |= XIMStatusNone;
else
im_style |= XIMStatusNothing;
xic = XCreateIC (context_xim->im_info->im,
XNInputStyle, im_style,
XNClientWindow, context_xim->client_window_xid,
name1, list1,
name2, list2,
NULL);
if (list1)
XFree (list1);
if (list2)
XFree (list2);
if (xic)
{
/* Don't filter key released events with XFilterEvents unless
* input methods ask for. This is a workaround for Solaris input
* method bug in C and European locales. It doubles each key
* stroke if both key pressed and released events are filtered.
* (bugzilla #81759)
*/
gulong mask = 0xaaaaaaaa;
XGetICValues (xic,
XNFilterEvents, &mask,
NULL);
context_xim->filter_key_release = (mask & KeyReleaseMask) != 0;
set_string_conversion_callback (context_xim, xic);
}
context_xim->ic = xic;
update_status_window (context_xim);
if (xic && context_xim->has_focus)
XSetICFocus (xic);
}
return context_xim->ic;
}
/*****************************************************************
* Status Window handling
*
* A status window is a small window attached to the toplevel
* that is used to display information to the user about the
* current input operation.
*
* We claim the toplevel's status window for an input context if:
*
* A) The input context has a toplevel
* B) The input context has the focus
* C) The input context has an XIC associated with it
*
* Tracking A) and C) is pretty reliable since we
* compute A) and create the XIC for C) ourselves.
* For B) we basically have to depend on our callers
* calling ::focus-in and ::focus-out at the right time.
*
* The toplevel is computed by walking up the GdkWindow
* hierarchy from context->client_window until we find a
* window that is owned by some widget, and then calling
* gtk_widget_get_toplevel() on that widget. This should
* handle both cases where we might have GdkWindows without widgets,
* and cases where GtkWidgets have strange window hierarchies
* (like a torn off GtkHandleBox.)
*
* The status window is visible if and only if there is text
* for it; whenever a new GtkIMContextXIM claims the status
* window, we blank out any existing text. We actually only
* create a GtkWindow for the status window the first time
* it is shown; this is an important optimization when we are
* using XIM with something like a simple compose-key input
* method that never needs a status window.
*****************************************************************/
/* Called when we no longer need a status window
*/
static void
disclaim_status_window (GtkIMContextXIM *context_xim)
{
if (context_xim->status_window)
{
g_assert (context_xim->status_window->context == context_xim);
status_window_set_text (context_xim->status_window, "");
context_xim->status_window->context = NULL;
context_xim->status_window = NULL;
}
}
/* Called when we need a status window
*/
static void
claim_status_window (GtkIMContextXIM *context_xim)
{
if (!context_xim->status_window && context_xim->client_widget)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (context_xim->client_widget);
if (toplevel && gtk_widget_is_toplevel (toplevel))
{
StatusWindow *status_window = status_window_get (toplevel);
if (status_window->context)
disclaim_status_window (status_window->context);
status_window->context = context_xim;
context_xim->status_window = status_window;
}
}
}
/* Basic call made whenever something changed that might cause
* us to need, or not to need a status window.
*/
static void
update_status_window (GtkIMContextXIM *context_xim)
{
if (context_xim->ic && context_xim->in_toplevel && context_xim->has_focus)
claim_status_window (context_xim);
else
disclaim_status_window (context_xim);
}
/* Updates the in_toplevel flag for @context_xim
*/
static void
update_in_toplevel (GtkIMContextXIM *context_xim)
{
if (context_xim->client_widget)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (context_xim->client_widget);
context_xim->in_toplevel = (toplevel && gtk_widget_is_toplevel (toplevel));
}
else
context_xim->in_toplevel = FALSE;
/* Some paranoia, in case we don't get a focus out */
if (!context_xim->in_toplevel)
context_xim->has_focus = FALSE;
update_status_window (context_xim);
}
/* Callback when @widget's toplevel changes. It will always
* change from NULL to a window, or a window to NULL;
* we use that intermediate NULL state to make sure
* that we disclaim the toplevel status window for the old
* window.
*/
static void
on_client_widget_hierarchy_changed (GtkWidget *widget,
GtkWidget *old_toplevel,
GtkIMContextXIM *context_xim)
{
update_in_toplevel (context_xim);
}
/* Finds the GtkWidget that owns the window, or if none, the
* widget owning the nearest parent that has a widget.
*/
static GtkWidget *
widget_for_window (GdkWindow *window)
{
while (window)
{
gpointer user_data;
gdk_window_get_user_data (window, &user_data);
if (user_data)
return user_data;
window = gdk_window_get_parent (window);
}
return NULL;
}
/* Called when context_xim->client_window changes; takes care of
* removing and/or setting up our watches for the toplevel
*/
static void
update_client_widget (GtkIMContextXIM *context_xim)
{
GtkWidget *new_client_widget = widget_for_window (context_xim->client_window);
if (new_client_widget != context_xim->client_widget)
{
if (context_xim->client_widget)
{
g_signal_handlers_disconnect_by_func (context_xim->client_widget,
G_CALLBACK (on_client_widget_hierarchy_changed),
context_xim);
}
context_xim->client_widget = new_client_widget;
if (context_xim->client_widget)
{
g_signal_connect (context_xim->client_widget, "hierarchy-changed",
G_CALLBACK (on_client_widget_hierarchy_changed),
context_xim);
}
update_in_toplevel (context_xim);
}
}
/* Called when the toplevel is destroyed; frees the status window
*/
static void
on_status_toplevel_destroy (GtkWidget *toplevel,
StatusWindow *status_window)
{
status_window_free (status_window);
}
/* Called when the screen for the toplevel changes; updates the
* screen for the status window to match.
*/
static void
on_status_toplevel_notify_display (GtkWindow *toplevel,
GParamSpec *pspec,
StatusWindow *status_window)
{
if (status_window->window)
gtk_window_set_display (GTK_WINDOW (status_window->window),
gtk_widget_get_display (GTK_WIDGET (toplevel)));
}
/* Called when the toplevel window is moved; updates the position of
* the status window to follow it.
*/
static gboolean
on_status_toplevel_configure (GtkWidget *toplevel,
GdkEvent *event,
StatusWindow *status_window)
{
if (gdk_event_get_event_type (event) == GDK_CONFIGURE)
{
GdkRectangle rect;
GtkRequisition requisition;
gint y;
gint height;
if (status_window->window)
{
height = DisplayHeight(GDK_WINDOW_XDISPLAY (gtk_widget_get_window (toplevel)), 0);
gdk_window_get_frame_extents (gtk_widget_get_window (toplevel), &rect);
gtk_widget_get_preferred_size ( (status_window->window), &requisition, NULL);
if (rect.y + rect.height + requisition.height < height)
y = rect.y + rect.height;
else
y = height - requisition.height;
gtk_window_move (GTK_WINDOW (status_window->window), rect.x, y);
}
}
return GDK_EVENT_PROPAGATE;
}
/* Frees a status window and removes its link from the status_windows list
*/
static void
status_window_free (StatusWindow *status_window)
{
status_windows = g_slist_remove (status_windows, status_window);
if (status_window->context)
status_window->context->status_window = NULL;
g_signal_handlers_disconnect_by_func (status_window->toplevel,
G_CALLBACK (on_status_toplevel_destroy),
status_window);
g_signal_handlers_disconnect_by_func (status_window->toplevel,
G_CALLBACK (on_status_toplevel_notify_display),
status_window);
g_signal_handlers_disconnect_by_func (status_window->toplevel,
G_CALLBACK (on_status_toplevel_configure),
status_window);
if (status_window->window)
gtk_widget_destroy (status_window->window);
g_object_set_data (G_OBJECT (status_window->toplevel), "gtk-im-xim-status-window", NULL);
g_free (status_window);
}
/* Finds the status window object for a toplevel, creating it if necessary.
*/
static StatusWindow *
status_window_get (GtkWidget *toplevel)
{
StatusWindow *status_window;
status_window = g_object_get_data (G_OBJECT (toplevel), "gtk-im-xim-status-window");
if (status_window)
return status_window;
status_window = g_new0 (StatusWindow, 1);
status_window->toplevel = toplevel;
status_windows = g_slist_prepend (status_windows, status_window);
g_signal_connect (toplevel, "destroy",
G_CALLBACK (on_status_toplevel_destroy),
status_window);
g_signal_connect (toplevel, "event",
G_CALLBACK (on_status_toplevel_configure),
status_window);
g_signal_connect (toplevel, "notify::display",
G_CALLBACK (on_status_toplevel_notify_display),
status_window);
g_object_set_data (G_OBJECT (toplevel), "gtk-im-xim-status-window", status_window);
return status_window;
}
/* Creates the widgets for the status window; called when we
* first need to show text for the status window.
*/
static void
status_window_make_window (StatusWindow *status_window)
{
GtkWidget *window;
GtkWidget *status_label;
status_window->window = gtk_window_new (GTK_WINDOW_POPUP);
window = status_window->window;
gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
status_label = gtk_label_new ("");
g_object_set (status_label, "margin", 1, NULL);
gtk_widget_show (status_label);
gtk_container_add (GTK_CONTAINER (window), status_label);
gtk_window_set_display (GTK_WINDOW (status_window->window),
gtk_widget_get_display (status_window->toplevel));
on_status_toplevel_configure (status_window->toplevel, NULL, status_window);
}
/* Updates the text in the status window, hiding or
* showing the window as necessary.
*/
static void
status_window_set_text (StatusWindow *status_window,
const gchar *text)
{
if (text[0])
{
GtkWidget *label;
if (!status_window->window)
status_window_make_window (status_window);
label = gtk_bin_get_child (GTK_BIN (status_window->window));
gtk_label_set_text (GTK_LABEL (label), text);
gtk_widget_show (status_window->window);
}
else
{
if (status_window->window)
gtk_widget_hide (status_window->window);
}
}
/**
* gtk_im_context_xim_shutdown:
*
* Destroys all the status windows that are kept by the XIM contexts. This
* function should only be called by the XIM module exit routine.
**/
void
gtk_im_context_xim_shutdown (void)
{
while (status_windows)
status_window_free (status_windows->data);
while (open_ims)
{
GtkXIMInfo *info = open_ims->data;
GdkDisplay *display = info->display;
xim_info_display_closed (display, FALSE, info);
open_ims = g_slist_remove_link (open_ims, open_ims);
}
}
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