gtkimcontextime.c 32.3 KB
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/*
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 * gtkimcontextime.c
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 * 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
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 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
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 *
 */

/*
 *  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
 */

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#ifdef GTK_DISABLE_DEPRECATED
#undef GTK_DISABLE_DEPRECATED
#endif

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#include "gtkimcontextime.h"

#include "imm-extra.h"

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#include <gdk/gdkkeysyms.h>
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#include "gdk/win32/gdkwin32.h"
#include "gdk/gdkkeysyms.h"
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#include <pango/pango.h>
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/* avoid warning */
#ifdef STRICT
# undef STRICT
# include <pango/pangowin32.h>
# ifndef STRICT
#   define STRICT 1
# endif
#else /* STRICT */
#   include <pango/pangowin32.h>
#endif /* STRICT */

/* #define BUFSIZE 4096 */

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#define IS_DEAD_KEY(k) \
    ((k) >= GDK_dead_grave && (k) <= (GDK_dead_dasia+1))

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#define FREE_PREEDIT_BUFFER(ctx) \
{                                \
  g_free((ctx)->priv->comp_str); \
  g_free((ctx)->priv->read_str); \
  (ctx)->priv->comp_str = NULL;  \
  (ctx)->priv->read_str = NULL;  \
  (ctx)->priv->comp_str_len = 0; \
  (ctx)->priv->read_str_len = 0; \
}


struct _GtkIMContextIMEPrivate
{
  /* save IME context when the client window is focused out */
  DWORD conversion_mode;
  DWORD sentence_mode;

  LPVOID comp_str;
  DWORD comp_str_len;
  LPVOID read_str;
  DWORD read_str_len;
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  guint32 dead_key_keyval;
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};


/* 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 */
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static void gtk_im_context_ime_set_preedit_font (GtkIMContext    *context);

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static GdkFilterReturn
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gtk_im_context_ime_message_filter               (GdkXEvent       *xevent,
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                                                 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)
{
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  const GTypeInfo im_context_ime_info = {
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    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->priv = g_malloc0 (sizeof (GtkIMContextIMEPrivate));
  context_ime->priv->conversion_mode  = 0;
  context_ime->priv->sentence_mode    = 0;
  context_ime->priv->comp_str         = NULL;
  context_ime->priv->comp_str_len     = 0;
  context_ime->priv->read_str         = NULL;
  context_ime->priv->read_str_len     = 0;
}


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)
    gtk_im_context_ime_set_client_window (context, NULL);

  FREE_PREEDIT_BUFFER (context_ime);

  if (G_OBJECT_CLASS (parent_class)->dispose)
    G_OBJECT_CLASS (parent_class)->dispose (obj);
}


static void
gtk_im_context_ime_finalize (GObject *obj)
{
  /* GtkIMContext *context = GTK_IM_CONTEXT (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;

  g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context));
  context_ime = GTK_IM_CONTEXT_IME (context);

  if (client_window)
    {
      HIMC himc;
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      HWND hwnd;
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      hwnd = gdk_win32_window_get_impl_hwnd (client_window);
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      himc = ImmGetContext (hwnd);
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      if (himc)
	{
	  context_ime->opened = ImmGetOpenStatus (himc);
	  ImmGetConversionStatus (himc,
				  &context_ime->priv->conversion_mode,
				  &context_ime->priv->sentence_mode);
	  ImmReleaseContext (hwnd, himc);
	}
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    }
  else if (context_ime->focus)
    {
      gtk_im_context_ime_focus_out (context);
    }

  context_ime->client_window = client_window;
}

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static gunichar
_gtk_im_context_ime_dead_key_unichar (guint    keyval,
                                      gboolean spacing)
{
  switch (keyval)
    {
#define CASE(keysym, unicode, spacing_unicode) \
      case GDK_dead_##keysym: return (spacing) ? spacing_unicode : unicode;

      CASE (grave, 0x0300, 0x0060);
      CASE (acute, 0x0301, 0x00b4);
      CASE (circumflex, 0x0302, 0x005e);
      CASE (tilde, 0x0303, 0x007e);	/* Also used with perispomeni, 0x342. */
      CASE (macron, 0x0304, 0x00af);
      CASE (breve, 0x0306, 0x02d8);
      CASE (abovedot, 0x0307, 0x02d9);
      CASE (diaeresis, 0x0308, 0x00a8);
      CASE (hook, 0x0309, 0);
      CASE (abovering, 0x030A, 0x02da);
      CASE (doubleacute, 0x030B, 0x2dd);
      CASE (caron, 0x030C, 0x02c7);
      CASE (abovecomma, 0x0313, 0);         /* Equivalent to psili */
      CASE (abovereversedcomma, 0x0314, 0); /* Equivalent to dasia */
      CASE (horn, 0x031B, 0);	/* Legacy use for psili, 0x313 (or 0x343). */
      CASE (belowdot, 0x0323, 0);
      CASE (cedilla, 0x0327, 0x00b8);
      CASE (ogonek, 0x0328, 0);	/* Legacy use for dasia, 0x314.*/
      CASE (iota, 0x0345, 0);

#undef CASE
    default:
      return 0;
    }
}

static void
_gtk_im_context_ime_commit_unichar (GtkIMContextIME *context_ime,
                                    gunichar         c)
{
  gchar utf8[10];
  int len;

  if (context_ime->priv->dead_key_keyval != 0)
    {
      gunichar combining;

      combining =
        _gtk_im_context_ime_dead_key_unichar (context_ime->priv->dead_key_keyval,
                                              FALSE);
      g_unichar_compose (c, combining, &c);
    }

  len = g_unichar_to_utf8 (c, utf8);
  utf8[len] = 0;

  g_signal_emit_by_name (context_ime, "commit", utf8);
  context_ime->priv->dead_key_keyval = 0;
}
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static gboolean
gtk_im_context_ime_filter_keypress (GtkIMContext *context,
                                    GdkEventKey  *event)
{
  GtkIMContextIME *context_ime;
  gboolean retval = FALSE;
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  guint32 c;
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  g_return_val_if_fail (GTK_IS_IM_CONTEXT_IME (context), FALSE);
  g_return_val_if_fail (event, FALSE);

  if (event->type == GDK_KEY_RELEASE)
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    return FALSE;
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  if (event->state & GDK_CONTROL_MASK)
    return FALSE;

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  context_ime = GTK_IM_CONTEXT_IME (context);
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  if (!context_ime->focus)
    return FALSE;
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  if (!GDK_IS_WINDOW (context_ime->client_window))
    return FALSE;

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  if (event->keyval == GDK_space &&
      context_ime->priv->dead_key_keyval != 0)
    {
      c = _gtk_im_context_ime_dead_key_unichar (context_ime->priv->dead_key_keyval, TRUE);
      context_ime->priv->dead_key_keyval = 0;
      _gtk_im_context_ime_commit_unichar (context_ime, c);
      return TRUE;
    }

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  c = gdk_keyval_to_unicode (event->keyval);
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  if (c)
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    {
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      _gtk_im_context_ime_commit_unichar (context_ime, c);
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      retval = TRUE;
    }
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  else if (IS_DEAD_KEY (event->keyval))
    {
      gunichar dead_key;

      dead_key = _gtk_im_context_ime_dead_key_unichar (event->keyval, FALSE);

      /* Emulate double input of dead keys */
      if (dead_key && event->keyval == context_ime->priv->dead_key_keyval)
        {
          c = _gtk_im_context_ime_dead_key_unichar (context_ime->priv->dead_key_keyval, TRUE);
          context_ime->priv->dead_key_keyval = 0;
          _gtk_im_context_ime_commit_unichar (context_ime, c);
          _gtk_im_context_ime_commit_unichar (context_ime, c);
        }
      else
        context_ime->priv->dead_key_keyval = event->keyval;
    }
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  return retval;
}


static void
gtk_im_context_ime_reset (GtkIMContext *context)
{
  GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (context);
  HWND hwnd;
  HIMC himc;

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  if (!context_ime->client_window)
    return;

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  hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
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  himc = ImmGetContext (hwnd);
  if (!himc)
    return;

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  if (context_ime->preediting)
    {
      if (ImmGetOpenStatus (himc))
        ImmNotifyIME (himc, NI_COMPOSITIONSTR, CPS_CANCEL, 0);
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      context_ime->preediting = FALSE;
      g_signal_emit_by_name (context, "preedit-changed");
    }
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  ImmReleaseContext (hwnd, himc);
}


static gchar *
get_utf8_preedit_string (GtkIMContextIME *context_ime, gint *pos_ret)
{
  gchar *utf8str = NULL;
  HWND hwnd;
  HIMC himc;
  gint pos = 0;

  if (pos_ret)
    *pos_ret = 0;

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  if (!context_ime->client_window)
    return g_strdup ("");
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  hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
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  himc = ImmGetContext (hwnd);
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  if (!himc)
    return g_strdup ("");
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  if (context_ime->preediting)
    {
      glong len;

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      len = ImmGetCompositionStringW (himc, GCS_COMPSTR, NULL, 0);
      if (len > 0)
	{
	  GError *error = NULL;
	  gpointer buf = g_alloca (len);

	  ImmGetCompositionStringW (himc, GCS_COMPSTR, buf, len);
	  len /= 2;
	  utf8str = g_utf16_to_utf8 (buf, len, 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 || len < pos)
		{
		  g_warning ("ImmGetCompositionString: "
			     "Invalid cursor position!");
		  pos = 0;
		}
	    }
	}
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    }

  if (!utf8str)
    {
      utf8str = g_strdup ("");
      pos = 0;
    }

  if (pos_ret)
    *pos_ret = pos;

  ImmReleaseContext (hwnd, himc);

  return utf8str;
}


static PangoAttrList *
get_pango_attr_list (GtkIMContextIME *context_ime, const gchar *utf8str)
{
  PangoAttrList *attrs = pango_attr_list_new ();
  HWND hwnd;
  HIMC himc;

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  if (!context_ime->client_window)
    return attrs;
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  hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
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  himc = ImmGetContext (hwnd);
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  if (!himc)
    return attrs;
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  if (context_ime->preediting)
    {
      const gchar *schr = utf8str, *echr;
      guint8 *buf;
      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.
       */
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      len = ImmGetCompositionStringW (himc, GCS_COMPATTR, NULL, 0);
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      buf = g_alloca (len);
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      ImmGetCompositionStringW (himc, GCS_COMPATTR, buf, len);
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      /*
       *  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.
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           *  Using the wide-char API, this value is same with UTF-8 offset.
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           */
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	  epos = g_utf8_pointer_to_offset (utf8str, echr);

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          /*
           *  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);

  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);

  utf8str = get_utf8_preedit_string (context_ime, &pos);

  if (attrs)
    *attrs = get_pango_attr_list (context_ime, utf8str);

  if (str)
    {
      *str = utf8str;
    }
  else
    {
      g_free (utf8str);
      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);
  GdkWindow *toplevel;
  GtkWidget *widget = NULL;
  HWND hwnd, top_hwnd;
  HIMC himc;

  if (!GDK_IS_WINDOW (context_ime->client_window))
    return;

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  /* swtich current context */
  context_ime->focus = TRUE;

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  hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
670 671 672 673 674 675 676 677 678
  himc = ImmGetContext (hwnd);
  if (!himc)
    return;

  toplevel = gdk_window_get_toplevel (context_ime->client_window);
  if (GDK_IS_WINDOW (toplevel))
    {
      gdk_window_add_filter (toplevel,
                             gtk_im_context_ime_message_filter, context_ime);
679
      top_hwnd = gdk_win32_window_get_impl_hwnd (toplevel);
680 681 682 683 684 685 686 687 688 689 690 691 692 693

      context_ime->toplevel = toplevel;
    }
  else
    {
      g_warning ("gtk_im_context_ime_focus_in(): "
                 "cannot find toplevel window.");
      return;
    }

  /* trace reparenting (probably no need) */
  gdk_window_get_user_data (context_ime->client_window, (gpointer) & widget);
  if (GTK_IS_WIDGET (widget))
    {
694
      g_signal_connect (widget, "hierarchy-changed",
695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
                        G_CALLBACK (cb_client_widget_hierarchy_changed),
                        context_ime);
    }
  else
    {
      /* warning? */
    }

  /* restore preedit context */
  ImmSetConversionStatus (himc,
                          context_ime->priv->conversion_mode,
                          context_ime->priv->sentence_mode);

  if (context_ime->opened)
    {
      if (!ImmGetOpenStatus (himc))
        ImmSetOpenStatus (himc, TRUE);
      if (context_ime->preediting)
        {
714 715 716 717
          ImmSetCompositionStringW (himc,
				    SCS_SETSTR,
				    context_ime->priv->comp_str,
				    context_ime->priv->comp_str_len, NULL, 0);
718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
          FREE_PREEDIT_BUFFER (context_ime);
        }
    }

  /* clean */
  ImmReleaseContext (hwnd, himc);
}


static void
gtk_im_context_ime_focus_out (GtkIMContext *context)
{
  GtkIMContextIME *context_ime = GTK_IM_CONTEXT_IME (context);
  GdkWindow *toplevel;
  GtkWidget *widget = NULL;
  HWND hwnd, top_hwnd;
  HIMC himc;

  if (!GDK_IS_WINDOW (context_ime->client_window))
    return;

739 740 741
  /* swtich current context */
  context_ime->focus = FALSE;

742
  hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
  himc = ImmGetContext (hwnd);
  if (!himc)
    return;

  /* save preedit context */
  ImmGetConversionStatus (himc,
                          &context_ime->priv->conversion_mode,
                          &context_ime->priv->sentence_mode);

  if (ImmGetOpenStatus (himc))
    {
      gboolean preediting = context_ime->preediting;

      if (preediting)
        {
          FREE_PREEDIT_BUFFER (context_ime);

          context_ime->priv->comp_str_len
761
            = ImmGetCompositionStringW (himc, GCS_COMPSTR, NULL, 0);
762 763
          context_ime->priv->comp_str
            = g_malloc (context_ime->priv->comp_str_len);
764 765 766
          ImmGetCompositionStringW (himc, GCS_COMPSTR,
				    context_ime->priv->comp_str,
				    context_ime->priv->comp_str_len);
767 768

          context_ime->priv->read_str_len
769
            = ImmGetCompositionStringW (himc, GCS_COMPREADSTR, NULL, 0);
770 771
          context_ime->priv->read_str
            = g_malloc (context_ime->priv->read_str_len);
772 773 774
          ImmGetCompositionStringW (himc, GCS_COMPREADSTR,
				    context_ime->priv->read_str,
				    context_ime->priv->read_str_len);
775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
        }

      ImmSetOpenStatus (himc, FALSE);

      context_ime->opened = TRUE;
      context_ime->preediting = preediting;
    }
  else
    {
      context_ime->opened = FALSE;
      context_ime->preediting = FALSE;
    }

  /* 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 event fileter */
  toplevel = gdk_window_get_toplevel (context_ime->client_window);
  if (GDK_IS_WINDOW (toplevel))
    {
      gdk_window_remove_filter (toplevel,
                                gtk_im_context_ime_message_filter,
                                context_ime);
804
      top_hwnd = gdk_win32_window_get_impl_hwnd (toplevel);
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837

      context_ime->toplevel = NULL;
    }
  else
    {
      g_warning ("gtk_im_context_ime_focus_out(): "
                 "cannot find toplevel window.");
    }

  /* clean */
  ImmReleaseContext (hwnd, himc);
}


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;

  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;

838
  hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
  himc = ImmGetContext (hwnd);
  if (!himc)
    return;

  get_window_position (context_ime->client_window, &wx, &wy);
  cf.dwStyle = CFS_POINT;
  cf.ptCurrentPos.x = wx + context_ime->cursor_location.x;
  cf.ptCurrentPos.y = wy + context_ime->cursor_location.y;
  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;

868
      hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
869 870 871
      himc = ImmGetContext (hwnd);
      if (!himc)
        return;
872 873 874 875

      /* FIXME: What to do? */

      ImmReleaseContext (hwnd, himc);
876 877 878 879 880
    }
}


static void
881
gtk_im_context_ime_set_preedit_font (GtkIMContext *context)
882 883 884 885 886
{
  GtkIMContextIME *context_ime;
  GtkWidget *widget = NULL;
  HWND hwnd;
  HIMC himc;
887 888 889
  HKL ime = GetKeyboardLayout (0);
  const gchar *lang;
  gunichar wc;
890
  PangoContext *pango_context;
891
  PangoFont *font;
892
  LOGFONT *logfont;
893 894 895 896 897 898 899 900 901 902 903

  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;

904
  hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
905 906 907 908 909 910 911 912 913
  himc = ImmGetContext (hwnd);
  if (!himc)
    return;

  /* set font */
  pango_context = gtk_widget_get_pango_context (widget);
  if (!pango_context)
    goto ERROR_OUT;

914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
  /* 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;
    }
  
  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,
953
				    gtk_widget_get_style (widget)->font_desc,
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
				    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
975
    font = pango_context_load_font (pango_context, gtk_widget_get_style (widget)->font_desc);
976

977 978 979
  if (!font)
    goto ERROR_OUT;

980
  logfont = pango_win32_font_logfont (font);
981
  if (logfont)
982
    ImmSetCompositionFont (himc, logfont);
983

984 985
  g_object_unref (font);

986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
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;

1011
  hwnd = gdk_win32_window_get_impl_hwnd (context_ime->client_window);
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
  himc = ImmGetContext (hwnd);
  if (!himc)
    return retval;

  switch (msg->message)
    {
    case WM_IME_COMPOSITION:
      {
        gint wx = 0, wy = 0;
        CANDIDATEFORM cf;

        get_window_position (context_ime->client_window, &wx, &wy);
        /* FIXME! */
        {
          HWND hwnd_top;
          POINT pt;
          RECT rc;

          hwnd_top =
1031 1032
            gdk_win32_window_get_impl_hwnd (gdk_window_get_toplevel
                                            (context_ime->client_window));
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
          GetWindowRect (hwnd_top, &rc);
          pt.x = wx;
          pt.y = wy;
          ClientToScreen (hwnd_top, &pt);
          wx = pt.x - rc.left;
          wy = pt.y - rc.top;
        }
        cf.dwIndex = 0;
        cf.dwStyle = CFS_CANDIDATEPOS;
        cf.ptCurrentPos.x = wx + context_ime->cursor_location.x;
        cf.ptCurrentPos.y = wy + context_ime->cursor_location.y
          + context_ime->cursor_location.height;
        ImmSetCandidateWindow (himc, &cf);

        if ((msg->lParam & GCS_COMPSTR))
1048
          g_signal_emit_by_name (context, "preedit-changed");
1049 1050 1051 1052 1053 1054 1055

        if (msg->lParam & GCS_RESULTSTR)
          {
            gsize len;
            gchar *utf8str = NULL;
            GError *error = NULL;

1056 1057 1058
	    len = ImmGetCompositionStringW (himc, GCS_RESULTSTR, NULL, 0);

            if (len > 0)
1059
              {
1060 1061 1062 1063
		gpointer buf = g_alloca (len);
		ImmGetCompositionStringW (himc, GCS_RESULTSTR, buf, len);
		len /= 2;
		utf8str = g_utf16_to_utf8 (buf, len, NULL, NULL, &error);
1064 1065 1066 1067 1068 1069 1070 1071 1072
                if (error)
                  {
                    g_warning ("%s", error->message);
                    g_error_free (error);
                  }
              }

            if (utf8str)
              {
1073
                g_signal_emit_by_name (context, "commit", utf8str);
1074
                g_free (utf8str);
1075
		retval = TRUE;
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
              }
          }

        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);
1087
      g_signal_emit_by_name (context, "preedit-start");
1088 1089 1090 1091 1092 1093
      if (context_ime->use_preedit)
        retval = TRUE;
      break;

    case WM_IME_ENDCOMPOSITION:
      context_ime->preediting = FALSE;
1094 1095
      g_signal_emit_by_name (context, "preedit-changed");
      g_signal_emit_by_name (context, "preedit-end");
1096 1097 1098 1099 1100 1101 1102 1103 1104
      if (context_ime->use_preedit)
        retval = TRUE;
      break;

    case WM_IME_NOTIFY:
      switch (msg->wParam)
        {
        case IMN_SETOPENSTATUS:
          context_ime->opened = ImmGetOpenStatus (himc);
1105
          gtk_im_context_ime_set_preedit_font (context);
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
          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->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);
    }
  else
    {
    }

  /* 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);
    }
  else
    {
    }

  context_ime->toplevel = new_toplevel;
}