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gtk2/modules/input/gtkimcontextime.c
Philip Zander e6f05da6ef Use native Windows API for converting keystrokes to characters 
Instead of using the incomplete GTK-internal emulation, use the WM_CHAR
messages sent by Windows. Make the IME input method the default for all
languages on Windows.
2020-07-16 15:01:47 +02:00

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/*
* gtkimcontextime.c
* Copyright (C) 2003 Takuro Ashie
* Copyright (C) 2003-2004 Kazuki IWAMOTO
*
* 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/>.
*
*/
/*
* Please see the following site for the detail of Windows IME API.
* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/appendix/hh/appendix/imeimes2_35ph.asp
*/
#ifdef GTK_DISABLE_DEPRECATED
#undef GTK_DISABLE_DEPRECATED
#endif
#include "gtkimcontextime.h"
#include "imm-extra.h"
#include "gdk/gdkkeysyms-compat.h"
#include "gdk/win32/gdkwin32.h"
#include "gdk/win32/gdkprivate-win32.h"
#include "gdk/gdkkeysyms.h"
#include "gdk/gdkinternals.h"
#include <pango/pango.h>
/* avoid warning */
#ifdef STRICT
# undef STRICT
# include <pango/pangowin32.h>
# ifndef STRICT
# define STRICT 1
# endif
#else /* STRICT */
# include <pango/pangowin32.h>
#endif /* STRICT */
/* Determines what happens when focus is lost while preedit is in process. */
typedef enum {
/* Preedit is committed. */
GTK_WIN32_IME_FOCUS_BEHAVIOR_COMMIT,
/* Preedit is discarded. */
GTK_WIN32_IME_FOCUS_BEHAVIOR_DISCARD,
/* Preedit follows the cursor (that means it will appear in the widget
* that receives the focus) */
GTK_WIN32_IME_FOCUS_BEHAVIOR_FOLLOW,
} GtkWin32IMEFocusBehavior;
struct _GtkIMContextIMEPrivate
{
/* When pretend_empty_preedit is set to TRUE,
* gtk_im_context_ime_get_preedit_string() will return an empty string
* instead of the actual content of ImmGetCompositionStringW().
*
* This is necessary because GtkEntry expects the preedit buffer to be
* cleared before commit() is called, otherwise it leads to an assertion
* failure in Pango. However, since we emit the commit() signal while
* handling the WM_IME_COMPOSITION message, the IME buffer will be non-empty,
* so we temporarily set this flag while emmiting the appropriate signals.
*
* See also:
* https://bugzilla.gnome.org/show_bug.cgi?id=787142
* https://gitlab.gnome.org/GNOME/gtk/commit/c255ba68fc2c918dd84da48a472e7973d3c00b03
*/
gboolean pretend_empty_preedit;
GtkWin32IMEFocusBehavior focus_behavior;
};
/* GObject class methods */
static void gtk_im_context_ime_class_init (GtkIMContextIMEClass *class);
static void gtk_im_context_ime_init (GtkIMContextIME *context_ime);
static void gtk_im_context_ime_dispose (GObject *obj);
static void gtk_im_context_ime_finalize (GObject *obj);
static void gtk_im_context_ime_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_im_context_ime_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
/* GtkIMContext's virtual functions */
static void gtk_im_context_ime_set_client_window (GtkIMContext *context,
GdkWindow *client_window);
static gboolean gtk_im_context_ime_filter_keypress (GtkIMContext *context,
GdkEventKey *event);
static void gtk_im_context_ime_reset (GtkIMContext *context);
static void gtk_im_context_ime_get_preedit_string (GtkIMContext *context,
gchar **str,
PangoAttrList **attrs,
gint *cursor_pos);
static void gtk_im_context_ime_focus_in (GtkIMContext *context);
static void gtk_im_context_ime_focus_out (GtkIMContext *context);
static void gtk_im_context_ime_set_cursor_location (GtkIMContext *context,
GdkRectangle *area);
static void gtk_im_context_ime_set_use_preedit (GtkIMContext *context,
gboolean use_preedit);
/* GtkIMContextIME's private functions */
static void gtk_im_context_ime_set_preedit_font (GtkIMContext *context);
static GdkFilterReturn
gtk_im_context_ime_message_filter (GdkXEvent *xevent,
GdkEvent *event,
gpointer data);
static void get_window_position (GdkWindow *win,
gint *x,
gint *y);
static void cb_client_widget_hierarchy_changed (GtkWidget *widget,
GtkWidget *widget2,
GtkIMContextIME *context_ime);
GType gtk_type_im_context_ime = 0;
static GObjectClass *parent_class;
void
gtk_im_context_ime_register_type (GTypeModule *type_module)
{
const GTypeInfo im_context_ime_info = {
sizeof (GtkIMContextIMEClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gtk_im_context_ime_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GtkIMContextIME),
0,
(GInstanceInitFunc) gtk_im_context_ime_init,
};
gtk_type_im_context_ime =
g_type_module_register_type (type_module,
GTK_TYPE_IM_CONTEXT,
"GtkIMContextIME", &im_context_ime_info, 0);
}
static void
gtk_im_context_ime_class_init (GtkIMContextIMEClass *class)
{
GtkIMContextClass *im_context_class = GTK_IM_CONTEXT_CLASS (class);
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
parent_class = g_type_class_peek_parent (class);
gobject_class->finalize = gtk_im_context_ime_finalize;
gobject_class->dispose = gtk_im_context_ime_dispose;
gobject_class->set_property = gtk_im_context_ime_set_property;
gobject_class->get_property = gtk_im_context_ime_get_property;
im_context_class->set_client_window = gtk_im_context_ime_set_client_window;
im_context_class->filter_keypress = gtk_im_context_ime_filter_keypress;
im_context_class->reset = gtk_im_context_ime_reset;
im_context_class->get_preedit_string = gtk_im_context_ime_get_preedit_string;
im_context_class->focus_in = gtk_im_context_ime_focus_in;
im_context_class->focus_out = gtk_im_context_ime_focus_out;
im_context_class->set_cursor_location = gtk_im_context_ime_set_cursor_location;
im_context_class->set_use_preedit = gtk_im_context_ime_set_use_preedit;
}
static void
gtk_im_context_ime_init (GtkIMContextIME *context_ime)
{
context_ime->client_window = NULL;
context_ime->toplevel = NULL;
context_ime->use_preedit = TRUE;
context_ime->preediting = FALSE;
context_ime->opened = FALSE;
context_ime->focus = FALSE;
context_ime->cursor_location.x = 0;
context_ime->cursor_location.y = 0;
context_ime->cursor_location.width = 0;
context_ime->cursor_location.height = 0;
context_ime->commit_string = NULL;
context_ime->priv = g_malloc0 (sizeof (GtkIMContextIMEPrivate));
context_ime->priv->focus_behavior = GTK_WIN32_IME_FOCUS_BEHAVIOR_COMMIT;
}
static void
gtk_im_context_ime_dispose (GObject *obj)
{
GtkIMContext *context = GTK_IM_CONTEXT (obj);
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (obj);
if (context_ime->client_window != NULL)
gtk_im_context_ime_set_client_window (context, NULL);
if (G_OBJECT_CLASS (parent_class)->dispose)
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static void
gtk_im_context_ime_finalize (GObject *obj)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (obj);
g_free (context_ime->priv);
context_ime->priv = NULL;
if (G_OBJECT_CLASS (parent_class)->finalize)
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gtk_im_context_ime_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (object);
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context_ime));
switch (prop_id)
{
default:
break;
}
}
static void
gtk_im_context_ime_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (object);
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context_ime));
switch (prop_id)
{
default:
break;
}
}
GtkIMContext *
gtk_im_context_ime_new (void)
{
return g_object_new (GTK_TYPE_IM_CONTEXT_IME, NULL);
}
static void
gtk_im_context_ime_set_client_window (GtkIMContext *context,
GdkWindow *client_window)
{
GtkIMContextIME *context_ime;
GdkWindow *toplevel = NULL;
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context));
context_ime = GTK_IM_CONTEXT_IME (context);
if (client_window != NULL && !GDK_IS_WINDOW (client_window))
{
g_warning ("client_window is not a GdkWindow!");
client_window = NULL;
}
if (client_window != NULL)
{
toplevel = gdk_window_get_toplevel (client_window);
if (GDK_IS_WINDOW (toplevel))
{
HWND hwnd = gdk_win32_window_get_impl_hwnd (toplevel);
HIMC himc = ImmGetContext (hwnd);
if (himc)
{
context_ime->opened = ImmGetOpenStatus (himc);
ImmReleaseContext (hwnd, himc);
}
else
{
context_ime->opened = FALSE;
}
}
else
{
g_warning ("Could not find toplevel window.");
}
}
else if (context_ime->focus)
{
gtk_im_context_ime_focus_out (context);
}
context_ime->client_window = client_window;
context_ime->toplevel = toplevel;
if (client_window)
g_return_if_fail (GDK_IS_WINDOW (context_ime->toplevel));
}
static gboolean
gtk_im_context_ime_filter_keypress (GtkIMContext *context,
GdkEventKey *event)
{
GtkIMContextIME *context_ime;
GdkEventPrivate *event_priv;
gchar *utf8;
g_return_val_if_fail (GTK_IS_IM_CONTEXT_IME (context), FALSE);
g_return_val_if_fail (event, FALSE);
context_ime = GTK_IM_CONTEXT_IME (context);
g_return_val_if_fail (gdk_event_is_allocated(event), FALSE);
event_priv = (GdkEventPrivate*)event;
if (event_priv->translation_len == 0)
return FALSE;
utf8 = g_utf16_to_utf8(event_priv->translation, event_priv->translation_len, NULL, NULL, NULL);
g_signal_emit_by_name (context_ime, "commit", utf8);
g_free(utf8);
return TRUE;
}
static void
gtk_im_context_ime_reset (GtkIMContext *context)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (context);
HWND hwnd;
HIMC himc;
if (!GDK_IS_WINDOW (context_ime->client_window))
return;
g_return_if_fail (GDK_IS_WINDOW (context_ime->toplevel));
hwnd = gdk_win32_window_get_impl_hwnd (context_ime->toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return;
ImmNotifyIME (himc, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
if (context_ime->preediting)
{
context_ime->preediting = FALSE;
g_signal_emit_by_name (context, "preedit-changed");
}
ImmReleaseContext (hwnd, himc);
}
static gchar *
get_utf8_preedit_string (GtkIMContextIME *context_ime,
gint kind,
gint *pos_ret)
{
gunichar2 *utf16str = NULL;
glong size;
gchar *utf8str = NULL;
HWND hwnd;
HIMC himc;
gint pos = 0;
GError *error = NULL;
if (pos_ret)
*pos_ret = 0;
if (!GDK_IS_WINDOW (context_ime->toplevel))
return g_strdup ("");
hwnd = gdk_win32_window_get_impl_hwnd (context_ime->toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return g_strdup ("");
size = ImmGetCompositionStringW (himc, kind, NULL, 0);
if (size > 0)
{
utf16str = g_malloc (size);
ImmGetCompositionStringW (himc, kind, utf16str, size);
utf8str = g_utf16_to_utf8 (utf16str, size / sizeof (gunichar2),
NULL, NULL, &error);
if (error)
{
g_warning ("%s", error->message);
g_error_free (error);
}
if (pos_ret)
{
pos = ImmGetCompositionStringW (himc, GCS_CURSORPOS, NULL, 0);
if (pos < 0 || size < pos)
{
g_warning ("ImmGetCompositionString: "
"Invalid cursor position!");
pos = 0;
}
}
}
if (!utf8str)
{
utf8str = g_strdup ("");
pos = 0;
}
if (pos_ret)
*pos_ret = pos;
ImmReleaseContext (hwnd, himc);
g_free (utf16str);
return utf8str;
}
static PangoAttrList *
get_pango_attr_list (GtkIMContextIME *context_ime, const gchar *utf8str)
{
PangoAttrList *attrs = pango_attr_list_new ();
HWND hwnd;
HIMC himc;
guint8 *buf = NULL;
if (!GDK_IS_WINDOW (context_ime->client_window))
return attrs;
g_return_val_if_fail (GDK_IS_WINDOW (context_ime->toplevel), attrs);
hwnd = gdk_win32_window_get_impl_hwnd (context_ime->toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return attrs;
if (context_ime->preediting)
{
const gchar *schr = utf8str, *echr;
guint16 f_red, f_green, f_blue, b_red, b_green, b_blue;
glong len, spos = 0, epos, sidx = 0, eidx;
PangoAttribute *attr;
/*
* get attributes list of IME.
*/
len = ImmGetCompositionStringW (himc, GCS_COMPATTR, NULL, 0);
buf = g_malloc (len);
ImmGetCompositionStringW (himc, GCS_COMPATTR, buf, len);
/*
* schr and echr are pointer in utf8str.
*/
for (echr = g_utf8_next_char (utf8str); *schr != '\0';
echr = g_utf8_next_char (echr))
{
/*
* spos and epos are buf(attributes list of IME) position by
* bytes.
* Using the wide-char API, this value is same with UTF-8 offset.
*/
epos = g_utf8_pointer_to_offset (utf8str, echr);
/*
* sidx and eidx are positions in utf8str by bytes.
*/
eidx = echr - utf8str;
/*
* convert attributes list to PangoAttriute.
*/
if (*echr == '\0' || buf[spos] != buf[epos])
{
switch (buf[spos])
{
case ATTR_TARGET_CONVERTED:
attr = pango_attr_underline_new (PANGO_UNDERLINE_DOUBLE);
attr->start_index = sidx;
attr->end_index = eidx;
pango_attr_list_change (attrs, attr);
f_red = f_green = f_blue = 0;
b_red = b_green = b_blue = 0xffff;
break;
case ATTR_TARGET_NOTCONVERTED:
f_red = f_green = f_blue = 0xffff;
b_red = b_green = b_blue = 0;
break;
case ATTR_INPUT_ERROR:
f_red = f_green = f_blue = 0;
b_red = b_green = b_blue = 0x7fff;
break;
default: /* ATTR_INPUT,ATTR_CONVERTED,ATTR_FIXEDCONVERTED */
attr = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
attr->start_index = sidx;
attr->end_index = eidx;
pango_attr_list_change (attrs, attr);
f_red = f_green = f_blue = 0;
b_red = b_green = b_blue = 0xffff;
}
attr = pango_attr_foreground_new (f_red, f_green, f_blue);
attr->start_index = sidx;
attr->end_index = eidx;
pango_attr_list_change (attrs, attr);
attr = pango_attr_background_new (b_red, b_green, b_blue);
attr->start_index = sidx;
attr->end_index = eidx;
pango_attr_list_change (attrs, attr);
schr = echr;
spos = epos;
sidx = eidx;
}
}
}
ImmReleaseContext (hwnd, himc);
g_free(buf);
return attrs;
}
static void
gtk_im_context_ime_get_preedit_string (GtkIMContext *context,
gchar **str,
PangoAttrList **attrs,
gint *cursor_pos)
{
gchar *utf8str = NULL;
gint pos = 0;
GtkIMContextIME *context_ime;
context_ime = GTK_IM_CONTEXT_IME (context);
if (!context_ime->focus || context_ime->priv->pretend_empty_preedit)
utf8str = g_strdup ("");
else
utf8str = get_utf8_preedit_string (context_ime, GCS_COMPSTR, &pos);
if (attrs)
*attrs = get_pango_attr_list (context_ime, utf8str);
if (str)
*str = utf8str;
else
g_free (utf8str);
if (cursor_pos)
*cursor_pos = pos;
}
static void
gtk_im_context_ime_focus_in (GtkIMContext *context)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (context);
GdkWindow *toplevel = NULL;
GtkWidget *widget = NULL;
HWND hwnd;
HIMC himc;
if (!GDK_IS_WINDOW (context_ime->client_window))
return;
/* swtich current context */
context_ime->focus = TRUE;
toplevel = gdk_window_get_toplevel (context_ime->client_window);
if (!GDK_IS_WINDOW (toplevel))
{
g_warning ("Could not find toplevel window.");
context_ime->toplevel = NULL;
context_ime->opened = FALSE;
return;
}
hwnd = gdk_win32_window_get_impl_hwnd (toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return;
gdk_window_add_filter (toplevel,
gtk_im_context_ime_message_filter, context_ime);
/* trace reparenting (probably no need) */
gdk_window_get_user_data (context_ime->client_window, (gpointer) & widget);
if (GTK_IS_WIDGET (widget))
{
g_signal_connect (widget, "hierarchy-changed",
G_CALLBACK (cb_client_widget_hierarchy_changed),
context_ime);
}
else
{
/* warning? */
}
context_ime->opened = ImmGetOpenStatus (himc);
switch (context_ime->priv->focus_behavior)
{
case GTK_WIN32_IME_FOCUS_BEHAVIOR_COMMIT:
case GTK_WIN32_IME_FOCUS_BEHAVIOR_DISCARD:
gtk_im_context_ime_reset (context);
break;
case GTK_WIN32_IME_FOCUS_BEHAVIOR_FOLLOW:
{
gchar *utf8str = get_utf8_preedit_string (context_ime, GCS_COMPSTR, NULL);
if (utf8str != NULL && strlen(utf8str) > 0)
{
context_ime->preediting = TRUE;
gtk_im_context_ime_set_cursor_location (context, NULL);
g_signal_emit_by_name (context, "preedit-start");
g_signal_emit_by_name (context, "preedit-changed");
}
g_free (utf8str);
}
break;
}
/* clean */
ImmReleaseContext (hwnd, himc);
}
static void
gtk_im_context_ime_focus_out (GtkIMContext *context)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (context);
GtkWidget *widget = NULL;
gboolean was_preediting;
if (!GDK_IS_WINDOW (context_ime->client_window))
return;
was_preediting = context_ime->preediting;
context_ime->opened = FALSE;
context_ime->preediting = FALSE;
context_ime->focus = FALSE;
switch (context_ime->priv->focus_behavior)
{
case GTK_WIN32_IME_FOCUS_BEHAVIOR_COMMIT:
if (was_preediting)
{
gchar *utf8str = get_utf8_preedit_string (context_ime, GCS_COMPSTR, NULL);
context_ime->priv->pretend_empty_preedit = TRUE;
g_signal_emit_by_name (context, "preedit-changed");
g_signal_emit_by_name (context, "preedit-end");
g_signal_emit_by_name (context, "commit", utf8str);
g_signal_emit_by_name (context, "preedit-start");
g_signal_emit_by_name (context, "preedit-changed");
context_ime->priv->pretend_empty_preedit = FALSE;
g_free (utf8str);
}
/* fallthrough */
case GTK_WIN32_IME_FOCUS_BEHAVIOR_DISCARD:
gtk_im_context_ime_reset (context);
/* Callbacks triggered by im_context_ime_reset() could set the focus back to our
context. In that case, we want to exit here. */
if (context_ime->focus)
return;
break;
case GTK_WIN32_IME_FOCUS_BEHAVIOR_FOLLOW:
break;
}
/* remove signal handler */
gdk_window_get_user_data (context_ime->client_window, (gpointer) & widget);
if (GTK_IS_WIDGET (widget))
{
g_signal_handlers_disconnect_by_func
(G_OBJECT (widget),
G_CALLBACK (cb_client_widget_hierarchy_changed), context_ime);
}
/* remove filter */
if (GDK_IS_WINDOW (context_ime->toplevel))
{
gdk_window_remove_filter (context_ime->toplevel,
gtk_im_context_ime_message_filter,
context_ime);
}
if (was_preediting)
{
g_signal_emit_by_name (context, "preedit-changed");
g_signal_emit_by_name (context, "preedit-end");
}
}
static void
gtk_im_context_ime_set_cursor_location (GtkIMContext *context,
GdkRectangle *area)
{
gint wx = 0, wy = 0;
GtkIMContextIME *context_ime;
COMPOSITIONFORM cf;
HWND hwnd;
HIMC himc;
guint scale;
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context));
context_ime = GTK_IM_CONTEXT_IME (context);
if (area)
context_ime->cursor_location = *area;
if (!context_ime->client_window)
return;
hwnd = gdk_win32_window_get_impl_hwnd (context_ime->toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return;
scale = gdk_window_get_scale_factor (context_ime->client_window);
get_window_position (context_ime->client_window, &wx, &wy);
cf.dwStyle = CFS_POINT;
cf.ptCurrentPos.x = (wx + context_ime->cursor_location.x) * scale;
cf.ptCurrentPos.y = (wy + context_ime->cursor_location.y) * scale;
ImmSetCompositionWindow (himc, &cf);
ImmReleaseContext (hwnd, himc);
}
static void
gtk_im_context_ime_set_use_preedit (GtkIMContext *context,
gboolean use_preedit)
{
GtkIMContextIME *context_ime;
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context));
context_ime = GTK_IM_CONTEXT_IME (context);
context_ime->use_preedit = use_preedit;
if (context_ime->preediting)
{
HWND hwnd;
HIMC himc;
hwnd = gdk_win32_window_get_impl_hwnd (context_ime->toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return;
/* FIXME: What to do? */
ImmReleaseContext (hwnd, himc);
}
}
static void
gtk_im_context_ime_set_preedit_font (GtkIMContext *context)
{
GtkIMContextIME *context_ime;
GtkWidget *widget = NULL;
HWND hwnd;
HIMC himc;
HKL ime = GetKeyboardLayout (0);
const gchar *lang;
gunichar wc;
PangoContext *pango_context;
PangoFont *font;
LOGFONT *logfont;
GtkStyleContext *style;
PangoFontDescription *font_desc;
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context));
context_ime = GTK_IM_CONTEXT_IME (context);
if (!context_ime->client_window)
return;
gdk_window_get_user_data (context_ime->client_window, (gpointer) &widget);
if (!GTK_IS_WIDGET (widget))
return;
hwnd = gdk_win32_window_get_impl_hwnd (context_ime->toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return;
/* set font */
pango_context = gtk_widget_get_pango_context (widget);
if (!pango_context)
goto ERROR_OUT;
/* Try to make sure we use a font that actually can show the
* language in question.
*/
switch (PRIMARYLANGID (LOWORD (ime)))
{
case LANG_JAPANESE:
lang = "ja"; break;
case LANG_KOREAN:
lang = "ko"; break;
case LANG_CHINESE:
switch (SUBLANGID (LOWORD (ime)))
{
case SUBLANG_CHINESE_TRADITIONAL:
lang = "zh_TW"; break;
case SUBLANG_CHINESE_SIMPLIFIED:
lang = "zh_CN"; break;
case SUBLANG_CHINESE_HONGKONG:
lang = "zh_HK"; break;
case SUBLANG_CHINESE_SINGAPORE:
lang = "zh_SG"; break;
case SUBLANG_CHINESE_MACAU:
lang = "zh_MO"; break;
default:
lang = "zh"; break;
}
break;
default:
lang = ""; break;
}
style = gtk_widget_get_style_context (widget);
gtk_style_context_save (style);
gtk_style_context_set_state (style, GTK_STATE_FLAG_NORMAL);
gtk_style_context_get (style,
gtk_style_context_get_state (style),
"font",
&font_desc,
NULL);
gtk_style_context_restore (style);
if (lang[0])
{
/* We know what language it is. Look for a character, any
* character, that language needs.
*/
PangoLanguage *pango_lang = pango_language_from_string (lang);
PangoFontset *fontset =
pango_context_load_fontset (pango_context,
font_desc,
pango_lang);
gunichar *sample =
g_utf8_to_ucs4 (pango_language_get_sample_string (pango_lang),
-1, NULL, NULL, NULL);
wc = 0x4E00; /* In all CJK languages? */
if (sample != NULL)
{
int i;
for (i = 0; sample[i]; i++)
if (g_unichar_iswide (sample[i]))
{
wc = sample[i];
break;
}
g_free (sample);
}
font = pango_fontset_get_font (fontset, wc);
g_object_unref (fontset);
}
else
font = pango_context_load_font (pango_context, font_desc);
if (!font)
goto ERROR_OUT;
logfont = pango_win32_font_logfont (font);
if (logfont)
ImmSetCompositionFont (himc, logfont);
g_object_unref (font);
ERROR_OUT:
/* clean */
ImmReleaseContext (hwnd, himc);
}
static GdkFilterReturn
gtk_im_context_ime_message_filter (GdkXEvent *xevent,
GdkEvent *event,
gpointer data)
{
GtkIMContext *context;
GtkIMContextIME *context_ime;
HWND hwnd;
HIMC himc;
MSG *msg = (MSG *) xevent;
GdkFilterReturn retval = GDK_FILTER_CONTINUE;
g_return_val_if_fail (GTK_IS_IM_CONTEXT_IME (data), retval);
context = GTK_IM_CONTEXT (data);
context_ime = GTK_IM_CONTEXT_IME (data);
if (!context_ime->focus)
return retval;
g_return_val_if_fail (GDK_IS_WINDOW (context_ime->toplevel), retval);
hwnd = gdk_win32_window_get_impl_hwnd (context_ime->toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return retval;
switch (msg->message)
{
case WM_IME_COMPOSITION:
{
gint wx = 0, wy = 0;
CANDIDATEFORM cf;
guint scale = gdk_window_get_scale_factor (context_ime->client_window);
get_window_position (context_ime->client_window, &wx, &wy);
/* FIXME! */
{
POINT pt;
RECT rc;
GetWindowRect (hwnd, &rc);
pt.x = wx * scale;
pt.y = wy * scale;
ClientToScreen (hwnd, &pt);
wx = (pt.x - rc.left) / scale;
wy = (pt.y - rc.top) / scale;
}
cf.dwIndex = 0;
cf.dwStyle = CFS_CANDIDATEPOS;
cf.ptCurrentPos.x = (wx + context_ime->cursor_location.x) * scale;
cf.ptCurrentPos.y = (wy + context_ime->cursor_location.y
+ context_ime->cursor_location.height) * scale;
ImmSetCandidateWindow (himc, &cf);
if ((msg->lParam & GCS_COMPSTR))
g_signal_emit_by_name (context, "preedit-changed");
if (msg->lParam & GCS_RESULTSTR)
{
gchar *utf8str = get_utf8_preedit_string (context_ime, GCS_RESULTSTR, NULL);
if (utf8str)
{
context_ime->priv->pretend_empty_preedit = TRUE;
g_signal_emit_by_name (context, "preedit-changed");
g_signal_emit_by_name (context, "preedit-end");
g_signal_emit_by_name (context, "commit", utf8str);
g_signal_emit_by_name (context, "preedit-start");
g_signal_emit_by_name (context, "preedit-changed");
context_ime->priv->pretend_empty_preedit = FALSE;
retval = TRUE;
}
g_free (utf8str);
}
if (context_ime->use_preedit)
retval = TRUE;
}
break;
case WM_IME_STARTCOMPOSITION:
context_ime->preediting = TRUE;
gtk_im_context_ime_set_cursor_location (context, NULL);
g_signal_emit_by_name (context, "preedit-start");
if (context_ime->use_preedit)
retval = TRUE;
break;
case WM_IME_ENDCOMPOSITION:
context_ime->preediting = FALSE;
g_signal_emit_by_name (context, "preedit-changed");
g_signal_emit_by_name (context, "preedit-end");
if (context_ime->use_preedit)
retval = TRUE;
break;
case WM_IME_NOTIFY:
switch (msg->wParam)
{
case IMN_SETOPENSTATUS:
context_ime->opened = ImmGetOpenStatus (himc);
gtk_im_context_ime_set_preedit_font (context);
break;
default:
break;
}
default:
break;
}
ImmReleaseContext (hwnd, himc);
return retval;
}
/*
* x and y must be initialized to 0.
*/
static void
get_window_position (GdkWindow *win, gint *x, gint *y)
{
GdkWindow *parent, *toplevel;
gint wx, wy;
g_return_if_fail (GDK_IS_WINDOW (win));
g_return_if_fail (x && y);
gdk_window_get_position (win, &wx, &wy);
*x += wx;
*y += wy;
parent = gdk_window_get_parent (win);
toplevel = gdk_window_get_toplevel (win);
if (parent && parent != toplevel)
get_window_position (parent, x, y);
}
/*
* probably, this handler isn't needed.
*/
static void
cb_client_widget_hierarchy_changed (GtkWidget *widget,
GtkWidget *widget2,
GtkIMContextIME *context_ime)
{
GdkWindow *new_toplevel;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context_ime));
if (!context_ime->client_window)
return;
if (!context_ime->focus)
return;
new_toplevel = gdk_window_get_toplevel (context_ime->client_window);
if (context_ime->client_window)
g_return_if_fail (new_toplevel != NULL);
if (context_ime->toplevel == new_toplevel)
return;
/* remove filter from old toplevel */
if (GDK_IS_WINDOW (context_ime->toplevel))
{
gdk_window_remove_filter (context_ime->toplevel,
gtk_im_context_ime_message_filter,
context_ime);
}
/* add filter to new toplevel */
if (GDK_IS_WINDOW (new_toplevel))
{
gdk_window_add_filter (new_toplevel,
gtk_im_context_ime_message_filter, context_ime);
}
context_ime->toplevel = new_toplevel;
}
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