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Learning_GTK4_tree/gtk/gtkimcontextime.c

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2023-12-12 11:36:42 +01:00
/*
* 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 "gtkimmoduleprivate.h"
#include "gtkroot.h"
#include "imm-extra.h"
#include "gdk/gdkkeysyms.h"
#include "gdk/gdkeventsprivate.h"
#include "gdk/win32/gdkwin32.h"
#include "gtk/gtkimmodule.h"
#include "gtk/deprecated/gtkstylecontextprivate.h"
#include "gtkwidgetprivate.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 emitting 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_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_widget (GtkIMContext *context,
GtkWidget *widget);
static gboolean gtk_im_context_ime_filter_keypress (GtkIMContext *context,
GdkEvent *event);
static void gtk_im_context_ime_reset (GtkIMContext *context);
static void gtk_im_context_ime_get_preedit_string (GtkIMContext *context,
char **str,
PangoAttrList **attrs,
int *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 GdkWin32MessageFilterReturn
gtk_im_context_ime_message_filter (GdkWin32Display *display,
MSG *msg,
int *ret_valp,
gpointer data);
G_DEFINE_TYPE_WITH_CODE (GtkIMContextIME, gtk_im_context_ime, GTK_TYPE_IM_CONTEXT,
gtk_im_module_ensure_extension_point ();
g_io_extension_point_implement (GTK_IM_MODULE_EXTENSION_POINT_NAME,
g_define_type_id,
"ime",
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);
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_widget = gtk_im_context_ime_set_client_widget;
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_widget = NULL;
context_ime->client_surface = 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_surface)
gtk_im_context_ime_set_client_widget (context, NULL);
G_OBJECT_CLASS (gtk_im_context_ime_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;
G_OBJECT_CLASS (gtk_im_context_ime_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_widget (GtkIMContext *context,
GtkWidget *widget)
{
GtkIMContextIME *context_ime;
GdkSurface *surface = NULL;
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context));
context_ime = GTK_IM_CONTEXT_IME (context);
if (widget)
surface = gtk_native_get_surface (gtk_widget_get_native (widget));
if (surface != NULL)
{
HWND hwnd = gdk_win32_surface_get_handle (surface);
HIMC himc = ImmGetContext (hwnd);
if (himc)
{
context_ime->opened = ImmGetOpenStatus (himc);
ImmReleaseContext (hwnd, himc);
}
else
{
context_ime->opened = FALSE;
}
}
else if (context_ime->focus)
{
gtk_im_context_ime_focus_out (context);
}
context_ime->client_widget = widget;
context_ime->client_surface = surface;
}
static gboolean
gtk_im_context_ime_filter_keypress (GtkIMContext *context,
GdkEvent *event)
{
GtkIMContextIME *context_ime;
char *compose_sequence = NULL;
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);
compose_sequence = gdk_key_event_get_compose_sequence (event);
if (compose_sequence)
{
g_signal_emit_by_name (context_ime, "commit", compose_sequence);
return TRUE;
}
return FALSE;
}
static void
gtk_im_context_ime_reset (GtkIMContext *context)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (context);
HWND hwnd;
HIMC himc;
if (!context_ime->client_surface)
return;
hwnd = gdk_win32_surface_get_handle (context_ime->client_surface);
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 char *
get_utf8_preedit_string (GtkIMContextIME *context_ime,
int kind,
int *pos_ret)
{
gunichar2 *utf16str = NULL;
glong size;
char *utf8str = NULL;
HWND hwnd;
HIMC himc;
int pos = 0;
GError *error = NULL;
if (pos_ret)
*pos_ret = 0;
if (!context_ime->client_surface)
return g_strdup ("");
hwnd = gdk_win32_surface_get_handle (context_ime->client_surface);
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 char *utf8str)
{
PangoAttrList *attrs = pango_attr_list_new ();
HWND hwnd;
HIMC himc;
guint8 *buf = NULL;
if (!context_ime->client_surface)
return attrs;
hwnd = gdk_win32_surface_get_handle (context_ime->client_surface);
himc = ImmGetContext (hwnd);
if (!himc)
return attrs;
if (context_ime->preediting)
{
const char *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,
char **str,
PangoAttrList **attrs,
int *cursor_pos)
{
char *utf8str = NULL;
int 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
utf8str = NULL;
if (cursor_pos)
*cursor_pos = pos;
}
static void
gtk_im_context_ime_focus_in (GtkIMContext *context)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (context);
GdkSurface *toplevel;
HWND hwnd;
HIMC himc;
if (!GDK_IS_SURFACE (context_ime->client_surface))
return;
/* switch current context */
context_ime->focus = TRUE;
toplevel = context_ime->client_surface;
if (!GDK_IS_SURFACE (toplevel))
{
g_warning ("gtk_im_context_ime_focus_in(): "
"cannot find toplevel window.");
return;
}
hwnd = gdk_win32_surface_get_handle (toplevel);
himc = ImmGetContext (hwnd);
if (!himc)
return;
gdk_win32_display_add_filter (GDK_WIN32_DISPLAY (gdk_surface_get_display (toplevel)),
gtk_im_context_ime_message_filter, context_ime);
/* restore preedit context */
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;
default:
g_assert_not_reached ();
break;
}
/* clean */
ImmReleaseContext (hwnd, himc);
}
static void
gtk_im_context_ime_focus_out (GtkIMContext *context)
{
GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (context);
gboolean was_preediting;
if (!GDK_IS_SURFACE (context_ime->client_surface))
return;
/* switch current context */
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);
}
G_GNUC_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;
default:
g_assert_not_reached ();
}
/* remove event filter */
if (GDK_IS_SURFACE (context_ime->client_surface))
{
gdk_win32_display_remove_filter (GDK_WIN32_DISPLAY (gdk_surface_get_display (context_ime->client_surface)),
gtk_im_context_ime_message_filter,
context_ime);
}
if (was_preediting)
{
g_warning ("gtk_im_context_ime_focus_out(): "
"cannot find toplevel window.");
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)
{
GtkIMContextIME *context_ime;
COMPOSITIONFORM cf;
HWND hwnd;
HIMC himc;
int 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_surface)
return;
hwnd = gdk_win32_surface_get_handle (context_ime->client_surface);
himc = ImmGetContext (hwnd);
if (!himc)
return;
scale = gdk_surface_get_scale_factor (context_ime->client_surface);
cf.dwStyle = CFS_POINT;
cf.ptCurrentPos.x = context_ime->cursor_location.x * scale;
cf.ptCurrentPos.y = 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_surface_get_handle (context_ime->client_surface);
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;
HWND hwnd;
HIMC himc;
HKL ime = GetKeyboardLayout (0);
const char *lang;
gunichar wc;
PangoContext *pango_context;
PangoFont *font;
LOGFONT *logfont;
PangoFontDescription *font_desc;
GtkCssStyle *style;
g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context));
context_ime = GTK_IM_CONTEXT_IME (context);
if (!(context_ime->client_widget && context_ime->client_surface))
return;
hwnd = gdk_win32_surface_get_handle (context_ime->client_surface);
himc = ImmGetContext (hwnd);
if (!himc)
return;
/* set font */
pango_context = gtk_widget_get_pango_context (context_ime->client_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_css_node_get_style (gtk_widget_get_css_node (context_ime->client_widget));
font_desc = gtk_css_style_get_pango_font (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 GdkWin32MessageFilterReturn
gtk_im_context_ime_message_filter (GdkWin32Display *display,
MSG *msg,
int *ret_valp,
gpointer data)
{
GtkIMContext *context;
GtkIMContextIME *context_ime;
HWND hwnd;
HIMC himc;
GdkSurface *toplevel;
GdkWin32MessageFilterReturn retval = GDK_WIN32_MESSAGE_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;
toplevel = context_ime->client_surface;
if (gdk_win32_surface_get_handle (toplevel) != msg->hwnd)
return retval;
hwnd = gdk_win32_surface_get_handle (context_ime->client_surface);
himc = ImmGetContext (hwnd);
if (!himc)
return retval;
*ret_valp = 0;
switch (msg->message)
{
case WM_IME_COMPOSITION:
{
CANDIDATEFORM cf;
int wx = 0;
int wy = 0;
int scale = 1;
if (context_ime->client_surface && context_ime->client_widget)
{
GtkNative *native = gtk_native_get_for_surface (context_ime->client_surface);
if G_LIKELY (native)
{
graphene_point_t p;
double decor_x = 0.0;
double decor_y = 0.0;
if (!gtk_widget_compute_point (context_ime->client_widget,
GTK_WIDGET (native),
&GRAPHENE_POINT_INIT (0, 0), &p))
graphene_point_init (&p, 0, 0);
gtk_native_get_surface_transform (native, &decor_x, &decor_y);
p.x += decor_x;
p.y += decor_y;
wx = (int) p.x;
wy = (int) p.y;
}
scale = gtk_widget_get_scale_factor (context_ime->client_widget);
}
cf.dwIndex = 0;
cf.dwStyle = CFS_EXCLUDE;
cf.ptCurrentPos.x = (wx + context_ime->cursor_location.x) * scale;
cf.ptCurrentPos.y = (wy + context_ime->cursor_location.y) * scale;
cf.rcArea.left = cf.ptCurrentPos.x;
cf.rcArea.right = cf.rcArea.left + context_ime->cursor_location.width * scale;
cf.rcArea.top = cf.ptCurrentPos.y;
cf.rcArea.bottom = cf.rcArea.top + 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 = GDK_WIN32_MESSAGE_FILTER_REMOVE;
}
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 = GDK_WIN32_MESSAGE_FILTER_REMOVE;
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 = GDK_WIN32_MESSAGE_FILTER_REMOVE;
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;
}
break;
default:
break;
}
ImmReleaseContext (hwnd, himc);
return retval;
}