path: root/e-util/e-spell-entry.c

/*
 * e-spell-entry.c
 *
 * This program 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.
 *
 * This program 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 General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

/* This code is based on libsexy's SexySpellEntry */

#include <config.h>
#include <gtk/gtk.h>
#include <glib/gi18n-lib.h>

#include <libebackend/libebackend.h>

#include <editor/gtkhtml-spell-language.h>
#include <editor/gtkhtml-spell-checker.h>

#include "e-spell-entry.h"

#define E_SPELL_ENTRY_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_SPELL_ENTRY, ESpellEntryPrivate))

struct _ESpellEntryPrivate {
    PangoAttrList *attr_list;
    gint mark_character;
    gint entry_scroll_offset;
    GSettings *settings;
    gboolean custom_checkers;
    gboolean checking_enabled;
    GSList *checkers;
    gchar **words;
    gint *word_starts;
    gint *word_ends;
};

enum {
    PROP_0,
    PROP_CHECKING_ENABLED
};

G_DEFINE_TYPE_WITH_CODE (
    ESpellEntry,
    e_spell_entry,
    GTK_TYPE_ENTRY,
    G_IMPLEMENT_INTERFACE (
        E_TYPE_EXTENSIBLE, NULL))

static gboolean
word_misspelled (ESpellEntry *entry,
                 gint start,
                 gint end)
{
    const gchar *text;
    gchar *word;
    gboolean result = TRUE;

    if (start == end)
        return FALSE;

    text = gtk_entry_get_text (GTK_ENTRY (entry));
    word = g_new0 (gchar, end - start + 2);

    g_strlcpy (word, text + start, end - start + 1);

    if (g_unichar_isalpha (*word)) {
        GSList *li;
        gssize wlen = strlen (word);

        for (li = entry->priv->checkers; li; li = g_slist_next (li)) {
            GtkhtmlSpellChecker *checker = li->data;
            if (gtkhtml_spell_checker_check_word (checker, word, wlen)) {
                result = FALSE;
                break;
            }
        }
    }

    g_free (word);

    return result;
}

static void
insert_underline (ESpellEntry *entry,
                  guint start,
                  guint end)
{
    PangoAttribute *ucolor;
    PangoAttribute *unline;

    ucolor = pango_attr_underline_color_new (65535, 0, 0);
    unline = pango_attr_underline_new (PANGO_UNDERLINE_ERROR);

    ucolor->start_index = start;
    unline->start_index = start;

    ucolor->end_index = end;
    unline->end_index = end;

    pango_attr_list_insert (entry->priv->attr_list, ucolor);
    pango_attr_list_insert (entry->priv->attr_list, unline);
}

static void
check_word (ESpellEntry *entry,
            gint start,
            gint end)
{
    PangoAttrIterator *it;

    /* Check to see if we've got any attributes at this position.
     * If so, free them, since we'll read it if the word is misspelled */
    it = pango_attr_list_get_iterator (entry->priv->attr_list);

    if (it == NULL)
        return;
    do {
        gint s, e;
        pango_attr_iterator_range (it, &s, &e);
        if (s == start) {
            /* XXX What does this do? */
            GSList *attrs = pango_attr_iterator_get_attrs (it);
            g_slist_free_full (
                attrs, (GDestroyNotify)
                pango_attribute_destroy);
        }
    } while (pango_attr_iterator_next (it));
    pango_attr_iterator_destroy (it);

    if (word_misspelled (entry, start, end))
        insert_underline (entry, start, end);
}

static void
spell_entry_recheck_all (ESpellEntry *entry)
{
    GtkWidget *widget = GTK_WIDGET (entry);
    PangoLayout *layout;
    gint length, i;
    gboolean check_words = FALSE;

    if (entry->priv->words == NULL)
        return;

    /* Remove all existing pango attributes.
     * These will get read as we check. */
    pango_attr_list_unref (entry->priv->attr_list);
    entry->priv->attr_list = pango_attr_list_new ();

    if (e_spell_entry_get_checking_enabled (entry))
        check_words = (entry->priv->checkers != NULL);

    if (check_words) {
        /* Loop through words */
        for (i = 0; entry->priv->words[i]; i++) {
            length = strlen (entry->priv->words[i]);
            if (length == 0)
                continue;
            check_word (
                entry,
                entry->priv->word_starts[i],
                entry->priv->word_ends[i]);
        }

        layout = gtk_entry_get_layout (GTK_ENTRY (entry));
        pango_layout_set_attributes (layout, entry->priv->attr_list);
    }

    if (gtk_widget_get_realized (widget))
        gtk_widget_queue_draw (widget);
}

static void
get_word_extents_from_position (ESpellEntry *entry,
                                gint *start,
                                gint *end,
                                guint position)
{
    const gchar *text;
    gint i, bytes_pos;

    *start = -1;
    *end = -1;

    if (entry->priv->words == NULL)
        return;

    text = gtk_entry_get_text (GTK_ENTRY (entry));
    bytes_pos = (gint) (g_utf8_offset_to_pointer (text, position) - text);

    for (i = 0; entry->priv->words[i]; i++) {
        if (bytes_pos >= entry->priv->word_starts[i] &&
            bytes_pos <= entry->priv->word_ends[i]) {
            *start = entry->priv->word_starts[i];
            *end = entry->priv->word_ends[i];
            return;
        }
    }
}

static void
entry_strsplit_utf8 (GtkEntry *entry,
                     gchar ***set,
                     gint **starts,
                     gint **ends)
{
    PangoLayout *layout;
    PangoLogAttr *log_attrs;
    const gchar *text;
    gint n_attrs, n_strings, i, j;

    layout = gtk_entry_get_layout (GTK_ENTRY (entry));
    text = gtk_entry_get_text (GTK_ENTRY (entry));
    pango_layout_get_log_attrs (layout, &log_attrs, &n_attrs);

    /* Find how many words we have */
    n_strings = 0;
    for (i = 0; i < n_attrs; i++)
        if (log_attrs[i].is_word_start)
            n_strings++;

    *set = g_new0 (gchar *, n_strings + 1);
    *starts = g_new0 (gint, n_strings);
    *ends = g_new0 (gint, n_strings);

    /* Copy out strings */
    for (i = 0, j = 0; i < n_attrs; i++) {
        if (log_attrs[i].is_word_start) {
            gint cend, bytes;
            gchar *start;

            /* Find the end of this string */
            cend = i;
            while (!(log_attrs[cend].is_word_end))
                cend++;

            /* Copy sub-string */
            start = g_utf8_offset_to_pointer (text, i);
            bytes = (gint) (g_utf8_offset_to_pointer (text, cend) - start);
            (*set)[j] = g_new0 (gchar, bytes + 1);
            (*starts)[j] = (gint) (start - text);
            (*ends)[j] = (gint) (start - text + bytes);
            g_utf8_strncpy ((*set)[j], start, cend - i);

            /* Move on to the next word */
            j++;
        }
    }

    g_free (log_attrs);
}

static void
add_to_dictionary (GtkWidget *menuitem,
                   ESpellEntry *entry)
{
    gchar *word;
    gint start, end;
    GtkhtmlSpellChecker *checker;

    get_word_extents_from_position (
        entry, &start, &end, entry->priv->mark_character);
    word = gtk_editable_get_chars (GTK_EDITABLE (entry), start, end);

    checker = g_object_get_data (G_OBJECT (menuitem), "spell-entry-checker");
    if (checker != NULL)
        gtkhtml_spell_checker_add_word (checker, word, -1);

    g_free (word);

    if (entry->priv->words != NULL) {
        g_strfreev (entry->priv->words);
        g_free (entry->priv->word_starts);
        g_free (entry->priv->word_ends);
    }

    entry_strsplit_utf8 (
        GTK_ENTRY (entry),
        &entry->priv->words,
        &entry->priv->word_starts,
        &entry->priv->word_ends);

    spell_entry_recheck_all (entry);
}

static void
ignore_all (GtkWidget *menuitem,
            ESpellEntry *entry)
{
    gchar *word;
    gint start, end;
    GSList *li;

    get_word_extents_from_position (
        entry, &start, &end, entry->priv->mark_character);
    word = gtk_editable_get_chars (GTK_EDITABLE (entry), start, end);

    for (li = entry->priv->checkers; li; li = g_slist_next (li)) {
        GtkhtmlSpellChecker *checker = li->data;
        gtkhtml_spell_checker_add_word_to_session (checker, word, -1);
    }

    g_free (word);

    if (entry->priv->words != NULL) {
        g_strfreev (entry->priv->words);
        g_free (entry->priv->word_starts);
        g_free (entry->priv->word_ends);
    }

    entry_strsplit_utf8 (
        GTK_ENTRY (entry),
        &entry->priv->words,
        &entry->priv->word_starts,
        &entry->priv->word_ends);

    spell_entry_recheck_all (entry);
}

static void
replace_word (GtkWidget *menuitem,
              ESpellEntry *entry)
{
    gchar *oldword;
    const gchar *newword;
    gint start, end;
    gint cursor;
    GtkhtmlSpellChecker *checker;

    get_word_extents_from_position (
        entry, &start, &end, entry->priv->mark_character);
    oldword = gtk_editable_get_chars (GTK_EDITABLE (entry), start, end);
    newword = gtk_label_get_text (
        GTK_LABEL (gtk_bin_get_child (GTK_BIN (menuitem))));

    cursor = gtk_editable_get_position (GTK_EDITABLE (entry));
    /* is the cursor at the end? If so, restore it there */
    if (g_utf8_strlen (gtk_entry_get_text (GTK_ENTRY (entry)), -1) == cursor)
        cursor = -1;
    else if (cursor > start && cursor <= end)
        cursor = start;

    gtk_editable_delete_text (GTK_EDITABLE (entry), start, end);
    gtk_editable_set_position (GTK_EDITABLE (entry), start);
    gtk_editable_insert_text (
        GTK_EDITABLE (entry), newword, strlen (newword), &start);
    gtk_editable_set_position (GTK_EDITABLE (entry), cursor);

    checker = g_object_get_data (G_OBJECT (menuitem), "spell-entry-checker");

    if (checker != NULL)
        gtkhtml_spell_checker_store_replacement (
            checker, oldword, -1, newword, -1);

    g_free (oldword);
}

static void
build_suggestion_menu (ESpellEntry *entry,
                       GtkWidget *menu,
                       GtkhtmlSpellChecker *checker,
                       const gchar *word)
{
    GtkWidget *mi;
    GList *suggestions, *iter;

    suggestions = gtkhtml_spell_checker_get_suggestions (checker, word, -1);

    if (suggestions == NULL) {
        /* no suggestions. Put something in the menu anyway... */
        GtkWidget *label = gtk_label_new (_("(no suggestions)"));
        PangoAttribute *attribute;
        PangoAttrList *attribute_list;

        attribute_list = pango_attr_list_new ();
        attribute = pango_attr_style_new (PANGO_STYLE_ITALIC);
        pango_attr_list_insert (attribute_list, attribute);
        gtk_label_set_attributes (GTK_LABEL (label), attribute_list);
        pango_attr_list_unref (attribute_list);

        mi = gtk_separator_menu_item_new ();
        gtk_container_add (GTK_CONTAINER (mi), label);
        gtk_widget_show_all (mi);
        gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), mi);
    } else {
        gint ii = 0;

        /* build a set of menus with suggestions */
        for (iter = suggestions; iter; iter = g_list_next (iter), ii++) {
            if ((ii != 0) && (ii % 10 == 0)) {
                mi = gtk_separator_menu_item_new ();
                gtk_widget_show (mi);
                gtk_menu_shell_append (GTK_MENU_SHELL (menu), mi);

                mi = gtk_menu_item_new_with_label (_("More..."));
                gtk_widget_show (mi);
                gtk_menu_shell_append (GTK_MENU_SHELL (menu), mi);

                menu = gtk_menu_new ();
                gtk_menu_item_set_submenu (GTK_MENU_ITEM (mi), menu);
            }

            mi = gtk_menu_item_new_with_label (iter->data);
            g_object_set_data (G_OBJECT (mi), "spell-entry-checker", checker);
            g_signal_connect (mi, "activate", G_CALLBACK (replace_word), entry);
            gtk_widget_show (mi);
            gtk_menu_shell_append (GTK_MENU_SHELL (menu), mi);
        }
    }

    g_list_free_full (suggestions, (GDestroyNotify) g_free);
}

static GtkWidget *
build_spelling_menu (ESpellEntry *entry,
                     const gchar *word)
{
    GtkhtmlSpellChecker *checker;
    GtkWidget *topmenu, *mi;
    gchar *label;

    topmenu = gtk_menu_new ();

    if (entry->priv->checkers == NULL)
        return topmenu;

    /* Suggestions */
    if (entry->priv->checkers->next == NULL) {
        checker = entry->priv->checkers->data;
        build_suggestion_menu (entry, topmenu, checker, word);
    } else {
        GSList *li;
        GtkWidget *menu;
        const gchar *lang_name;

        for (li = entry->priv->checkers; li; li = g_slist_next (li)) {
            const GtkhtmlSpellLanguage *language;

            checker = li->data;
            language = gtkhtml_spell_checker_get_language (checker);
            if (language == NULL)
                continue;

            lang_name = gtkhtml_spell_language_get_name (language);
            if (lang_name == NULL)
                lang_name = gtkhtml_spell_language_get_code (language);
            if (lang_name == NULL)
                lang_name = "???";

            mi = gtk_menu_item_new_with_label (lang_name);

            gtk_widget_show (mi);
            gtk_menu_shell_append (GTK_MENU_SHELL (topmenu), mi);
            menu = gtk_menu_new ();
            gtk_menu_item_set_submenu (GTK_MENU_ITEM (mi), menu);
            build_suggestion_menu (entry, menu, checker, word);
        }
    }

    /* Separator */
    mi = gtk_separator_menu_item_new ();
    gtk_widget_show (mi);
    gtk_menu_shell_append (GTK_MENU_SHELL (topmenu), mi);

    /* + Add to Dictionary */
    label = g_strdup_printf (_("Add \"%s\" to Dictionary"), word);
    mi = gtk_image_menu_item_new_with_label (label);
    g_free (label);

    gtk_image_menu_item_set_image (
        GTK_IMAGE_MENU_ITEM (mi),
        gtk_image_new_from_stock (GTK_STOCK_ADD, GTK_ICON_SIZE_MENU));

    if (entry->priv->checkers->next == NULL) {
        checker = entry->priv->checkers->data;
        g_object_set_data (G_OBJECT (mi), "spell-entry-checker", checker);
        g_signal_connect (
            mi, "activate",
            G_CALLBACK (add_to_dictionary), entry);
    } else {
        GSList *li;
        GtkWidget *menu, *submi;
        const gchar *lang_name;

        menu = gtk_menu_new ();
        gtk_menu_item_set_submenu (GTK_MENU_ITEM (mi), menu);

        for (li = entry->priv->checkers; li; li = g_slist_next (li)) {
            const GtkhtmlSpellLanguage *language;

            checker = li->data;
            language = gtkhtml_spell_checker_get_language (checker);
            if (language == NULL)
                continue;

            lang_name = gtkhtml_spell_language_get_name (language);
            if (lang_name == NULL)
                lang_name = gtkhtml_spell_language_get_code (language);
            if (lang_name == NULL)
                lang_name = "???";

            submi = gtk_menu_item_new_with_label (lang_name);
            g_object_set_data (G_OBJECT (submi), "spell-entry-checker", checker);
            g_signal_connect (
                submi, "activate",
                G_CALLBACK (add_to_dictionary), entry);

            gtk_widget_show (submi);
            gtk_menu_shell_append (GTK_MENU_SHELL (menu), submi);
        }
    }

    gtk_widget_show_all (mi);
    gtk_menu_shell_append (GTK_MENU_SHELL (topmenu), mi);

    /* - Ignore All */
    mi = gtk_image_menu_item_new_with_label (_("Ignore All"));
    gtk_image_menu_item_set_image (
        GTK_IMAGE_MENU_ITEM (mi),
        gtk_image_new_from_stock (GTK_STOCK_REMOVE, GTK_ICON_SIZE_MENU));
    g_signal_connect (mi, "activate", G_CALLBACK (ignore_all), entry);
    gtk_widget_show_all (mi);
    gtk_menu_shell_append (GTK_MENU_SHELL (topmenu), mi);

    return topmenu;
}

static void
spell_entry_add_suggestions_menu (ESpellEntry *entry,
                                  GtkMenu *menu,
                                  const gchar *word)
{
    GtkWidget *icon, *mi;

    g_return_if_fail (menu != NULL);
    g_return_if_fail (word != NULL);

    /* separator */
    mi = gtk_separator_menu_item_new ();
    gtk_widget_show (mi);
    gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), mi);

    /* Above the separator, show the suggestions menu */
    icon = gtk_image_new_from_stock (GTK_STOCK_SPELL_CHECK, GTK_ICON_SIZE_MENU);
    mi = gtk_image_menu_item_new_with_label (_("Spelling Suggestions"));
    gtk_image_menu_item_set_image (GTK_IMAGE_MENU_ITEM (mi), icon);

    gtk_menu_item_set_submenu (GTK_MENU_ITEM (mi), build_spelling_menu (entry, word));

    gtk_widget_show_all (mi);
    gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), mi);
}

static gboolean
spell_entry_popup_menu (ESpellEntry *entry)
{
    /* Menu popped up from a keybinding (menu key or <shift>+F10).
     * Use the cursor position as the mark position. */
    entry->priv->mark_character =
        gtk_editable_get_position (GTK_EDITABLE (entry));

    return FALSE;
}

static void
spell_entry_populate_popup (ESpellEntry *entry,
                            GtkMenu *menu,
                            gpointer data)
{
    gint start, end;
    gchar *word;

    if (entry->priv->checkers == NULL)
        return;

    get_word_extents_from_position (
        entry, &start, &end, entry->priv->mark_character);
    if (start == end)
        return;

    if (!word_misspelled (entry, start, end))
        return;

    word = gtk_editable_get_chars (GTK_EDITABLE (entry), start, end);
    g_return_if_fail (word != NULL);

    spell_entry_add_suggestions_menu (entry, menu, word);

    g_free (word);
}

static void
spell_entry_changed (GtkEditable *editable)
{
    ESpellEntry *entry = E_SPELL_ENTRY (editable);

    if (entry->priv->checkers == NULL)
        return;

    if (entry->priv->words != NULL) {
        g_strfreev (entry->priv->words);
        g_free (entry->priv->word_starts);
        g_free (entry->priv->word_ends);
    }

    entry_strsplit_utf8 (
        GTK_ENTRY (entry),
        &entry->priv->words,
        &entry->priv->word_starts,
        &entry->priv->word_ends);

    spell_entry_recheck_all (entry);
}

static void
spell_entry_notify_scroll_offset (ESpellEntry *spell_entry)
{
    g_object_get (
        G_OBJECT (spell_entry), "scroll-offset",
        &spell_entry->priv->entry_scroll_offset, NULL);
}

static GList *
spell_entry_load_spell_languages (void)
{
    GSettings *settings;
    GList *spell_languages = NULL;
    gchar **strv;
    gint ii;

    /* Ask GSettings for a list of spell check language codes. */
    settings = g_settings_new ("org.gnome.evolution.mail");
    strv = g_settings_get_strv (settings, "composer-spell-languages");
    g_object_unref (settings);

    /* Convert the codes to spell language structs. */
    for (ii = 0; strv[ii] != NULL; ii++) {
        gchar *language_code = strv[ii];
        const GtkhtmlSpellLanguage *language;

        language = gtkhtml_spell_language_lookup (language_code);
        if (language != NULL)
            spell_languages = g_list_prepend (
                spell_languages, (gpointer) language);
    }

    g_strfreev (strv);

    spell_languages = g_list_reverse (spell_languages);

    /* Pick a default spell language if it came back empty. */
    if (spell_languages == NULL) {
        const GtkhtmlSpellLanguage *language;

        language = gtkhtml_spell_language_lookup (NULL);

        if (language) {
            spell_languages = g_list_prepend (
                spell_languages, (gpointer) language);
        }
    }

    return spell_languages;
}

static void
spell_entry_settings_changed (ESpellEntry *spell_entry,
                              const gchar *key)
{
    GList *languages;

    g_return_if_fail (spell_entry != NULL);

    if (spell_entry->priv->custom_checkers)
        return;

    if (key && !g_str_equal (key, "composer-spell-languages"))
        return;

    languages = spell_entry_load_spell_languages ();
    e_spell_entry_set_languages (spell_entry, languages);
    g_list_free (languages);

    spell_entry->priv->custom_checkers = FALSE;
}

static gint
spell_entry_find_position (ESpellEntry *spell_entry,
                           gint x)
{
    PangoLayout *layout;
    PangoLayoutLine *line;
    gint index;
    gint pos;
    gint trailing;
    const gchar *text;
    GtkEntry *entry = GTK_ENTRY (spell_entry);

    layout = gtk_entry_get_layout (entry);
    text = pango_layout_get_text (layout);

    line = pango_layout_get_lines_readonly (layout)->data;
    pango_layout_line_x_to_index (line, x * PANGO_SCALE, &index, &trailing);

    pos = g_utf8_pointer_to_offset (text, text + index);
    pos += trailing;

    return pos;
}

static void
spell_entry_set_property (GObject *object,
                          guint property_id,
                          const GValue *value,
                          GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CHECKING_ENABLED:
            e_spell_entry_set_checking_enabled (
                E_SPELL_ENTRY (object),
                g_value_get_boolean (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
spell_entry_get_property (GObject *object,
                                  guint property_id,
                                  GValue *value,
                                  GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_CHECKING_ENABLED:
            g_value_set_boolean (
                value,
                e_spell_entry_get_checking_enabled (
                E_SPELL_ENTRY (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
spell_entry_dispose (GObject *object)
{
    ESpellEntryPrivate *priv;

    priv = E_SPELL_ENTRY_GET_PRIVATE (object);

    g_slist_free_full (priv->checkers, (GDestroyNotify) g_object_unref);
    priv->checkers = NULL;

    g_clear_object (&priv->settings);

    if (priv->attr_list != NULL) {
        pango_attr_list_unref (priv->attr_list);
        priv->attr_list = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_spell_entry_parent_class)->dispose (object);
}

static void
spell_entry_finalize (GObject *object)
{
    ESpellEntryPrivate *priv;

    priv = E_SPELL_ENTRY_GET_PRIVATE (object);

    g_strfreev (priv->words);
    g_free (priv->word_starts);
    g_free (priv->word_ends);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (e_spell_entry_parent_class)->finalize (object);
}

static void
spell_entry_constructed (GObject *object)
{
    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (e_spell_entry_parent_class)->constructed (object);

    e_extensible_load_extensions (E_EXTENSIBLE (object));
}

static gboolean
spell_entry_draw (GtkWidget *widget,
                  cairo_t *cr)
{
    ESpellEntry *spell_entry = E_SPELL_ENTRY (widget);
    GtkEntry *entry = GTK_ENTRY (widget);
    PangoLayout *layout;

    layout = gtk_entry_get_layout (entry);
    pango_layout_set_attributes (layout, spell_entry->priv->attr_list);

    /* Chain up to parent's draw() method. */
    return GTK_WIDGET_CLASS (e_spell_entry_parent_class)->
        draw (widget, cr);
}

static gboolean
spell_entry_button_press (GtkWidget *widget,
                          GdkEventButton *event)
{
    ESpellEntry *spell_entry = E_SPELL_ENTRY (widget);

    spell_entry->priv->mark_character = spell_entry_find_position (
        spell_entry, event->x + spell_entry->priv->entry_scroll_offset);

    /* Chain up to parent's button_press_event() method. */
    return GTK_WIDGET_CLASS (e_spell_entry_parent_class)->
        button_press_event (widget, event);
}

static void
e_spell_entry_class_init (ESpellEntryClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;

    g_type_class_add_private (class, sizeof (ESpellEntryPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = spell_entry_set_property;
    object_class->get_property = spell_entry_get_property;
    object_class->dispose = spell_entry_dispose;
    object_class->finalize = spell_entry_finalize;
    object_class->constructed = spell_entry_constructed;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->draw = spell_entry_draw;
    widget_class->button_press_event = spell_entry_button_press;

    g_object_class_install_property (
        object_class,
        PROP_CHECKING_ENABLED,
        g_param_spec_boolean (
            "checking-enabled",
            "checking enabled",
            "Spell Checking is Enabled",
            TRUE,
            G_PARAM_READWRITE |
            G_PARAM_STATIC_STRINGS));
}

static void
e_spell_entry_init (ESpellEntry *spell_entry)
{
    spell_entry->priv = E_SPELL_ENTRY_GET_PRIVATE (spell_entry);
    spell_entry->priv->attr_list = pango_attr_list_new ();
    spell_entry->priv->checkers = NULL;
    spell_entry->priv->checking_enabled = TRUE;

    g_signal_connect (
        spell_entry, "popup-menu",
        G_CALLBACK (spell_entry_popup_menu), NULL);
    g_signal_connect (
        spell_entry, "populate-popup",
        G_CALLBACK (spell_entry_populate_popup), NULL);
    g_signal_connect (
        spell_entry, "changed",
        G_CALLBACK (spell_entry_changed), NULL);
    g_signal_connect (
        spell_entry, "notify::scroll-offset",
        G_CALLBACK (spell_entry_notify_scroll_offset), NULL);

    /* listen for languages changes */
    spell_entry->priv->settings = g_settings_new ("org.gnome.evolution.mail");
    g_signal_connect_swapped (
        spell_entry->priv->settings, "changed",
        G_CALLBACK (spell_entry_settings_changed), spell_entry);

    /* load current settings */
    spell_entry_settings_changed (spell_entry, NULL);
}

GtkWidget *
e_spell_entry_new (void)
{
    return g_object_new (E_TYPE_SPELL_ENTRY, NULL);
}

/* 'languages' consists of 'const GtkhtmlSpellLanguage *' */
void
e_spell_entry_set_languages (ESpellEntry *spell_entry,
                             GList *languages)
{
    GList *iter;

    g_return_if_fail (spell_entry != NULL);

    spell_entry->priv->custom_checkers = TRUE;

    if (spell_entry->priv->checkers)
        g_slist_free_full (spell_entry->priv->checkers, g_object_unref);
    spell_entry->priv->checkers = NULL;

    for (iter = languages; iter; iter = g_list_next (iter)) {
        const GtkhtmlSpellLanguage *language = iter->data;

        if (language)
            spell_entry->priv->checkers = g_slist_prepend (
                spell_entry->priv->checkers,
                gtkhtml_spell_checker_new (language));
    }

    spell_entry->priv->checkers = g_slist_reverse (spell_entry->priv->checkers);

    if (gtk_widget_get_realized (GTK_WIDGET (spell_entry)))
        spell_entry_recheck_all (spell_entry);
}

gboolean
e_spell_entry_get_checking_enabled (ESpellEntry *spell_entry)
{
    g_return_val_if_fail (E_IS_SPELL_ENTRY (spell_entry), FALSE);

    return spell_entry->priv->checking_enabled;
}

void
e_spell_entry_set_checking_enabled (ESpellEntry *spell_entry,
                                    gboolean enable_checking)
{
    g_return_if_fail (E_IS_SPELL_ENTRY (spell_entry));

    if (spell_entry->priv->checking_enabled == enable_checking)
        return;

    spell_entry->priv->checking_enabled = enable_checking;
    spell_entry_recheck_all (spell_entry);

    g_object_notify (G_OBJECT (spell_entry), "checking-enabled");
}