/** \brief  Create an execution environment that will allow the effect
            to execute independently.
    \param effect  The effect that we should execute
    \param doc     The Document to execute on
    \param docCache  The cache created for that document
    \param show_working  Show the working dialog
    \param show_error    Show the error dialog (not working)

    Grabs the selection of the current document so that it can get
    restored.  Will generate a document cache if one isn't provided.
*/
ExecutionEnv::ExecutionEnv (Effect * effect, Inkscape::UI::View::View * doc, Implementation::ImplementationDocumentCache * docCache, bool show_working, bool show_errors) :
    _state(ExecutionEnv::INIT),
    _visibleDialog(NULL),
    _mainloop(NULL),
    _doc(doc),
    _docCache(docCache),
    _effect(effect),
    _show_working(show_working),
    _show_errors(show_errors)
{
    SPDesktop *desktop = (SPDesktop *)_doc;
    sp_namedview_document_from_window(desktop);

    if (desktop != NULL) {
    	std::vector<SPItem*> selected = desktop->getSelection()->itemList();
        for(std::vector<SPItem*>::const_iterator x = selected.begin(); x != selected.end(); ++x){
            Glib::ustring selected_id;
            selected_id = (*x)->getId();
            _selected.insert(_selected.end(), selected_id);
            //std::cout << "Selected: " << selected_id << std::endl;
        }
    }

    genDocCache();

    return;
}

void
ExecutionEnv::reselect (void) {
    if (_doc == NULL) {
        return;
    }
    SPDocument * doc = _doc->doc();
    if (doc == NULL) {
        return;
    }

    SPDesktop *desktop = (SPDesktop *)_doc;
    sp_namedview_document_from_window(desktop);

    if (desktop == NULL) {
        return;
    }

    Inkscape::Selection * selection = desktop->getSelection();

    for (std::list<Glib::ustring>::iterator i = _selected.begin(); i != _selected.end(); ++i) {
        SPObject * obj = doc->getObjectById(i->c_str());
        if (obj != NULL) {
            selection->add(obj);
        }
    }

    return;
}

/*
 * User selected a gradient from the combobox
 */
static void gr_gradient_combo_changed(EgeSelectOneAction *act, gpointer data)
{
    if (blocked) {
        return;
    }

    SPGradient *gr = NULL;
    gint n = ege_select_one_action_get_active(act);
    GtkTreeModel *model = ege_select_one_action_get_model(act);
    GtkTreeIter  iter;
    if (gtk_tree_model_iter_nth_child(model, &iter, NULL, n)) {
        gtk_tree_model_get(model, &iter, 2, &gr, -1);
    }

    if (gr) {
        gr = sp_gradient_ensure_vector_normalized(gr);

        SPDesktop *desktop = static_cast<SPDesktop *>(data);
        Inkscape::Selection *selection = sp_desktop_selection(desktop);
        ToolBase *ev = desktop->getEventContext();

        gr_apply_gradient(selection, ev? ev->get_drag() : NULL, gr);

        DocumentUndo::done(sp_desktop_document(desktop), SP_VERB_CONTEXT_GRADIENT,
                   _("Assign gradient to object"));
    }

}

static void sp_simplify_flatten(GtkWidget * /*widget*/, GObject *obj)
{
    SPDesktop *desktop = static_cast<SPDesktop *>(g_object_get_data(obj, "desktop"));
    std::vector<SPItem *> selected = desktop->getSelection()->itemList();
    for (std::vector<SPItem *>::iterator it(selected.begin()); it != selected.end(); ++it){
        SPLPEItem* lpeitem = dynamic_cast<SPLPEItem*>(*it);
        if (lpeitem && lpeitem->hasPathEffect()){
            PathEffectList lpelist = lpeitem->getEffectList();
            std::list<Inkscape::LivePathEffect::LPEObjectReference *>::iterator i;
            for (i = lpelist.begin(); i != lpelist.end(); ++i) {
                LivePathEffectObject *lpeobj = (*i)->lpeobject;
                if (lpeobj) {
                    Inkscape::LivePathEffect::Effect *lpe = lpeobj->get_lpe();
                    if (dynamic_cast<Inkscape::LivePathEffect::LPESimplify *>(lpe)) {
                        SPShape * shape = dynamic_cast<SPShape *>(lpeitem);
                        if(shape){
                            SPCurve * c = shape->getCurveBeforeLPE();
                            lpe->doEffect(c);
                            lpeitem->setCurrentPathEffect(*i);
                            if (lpelist.size() > 1){
                                lpeitem->removeCurrentPathEffect(true);
                                shape->setCurveBeforeLPE(c);
                            } else {
                                lpeitem->removeCurrentPathEffect(false);
                                shape->setCurve(c,0);
                            }
                            break;
                        }
                    }
                }
            }
        }
    }
}

static void box3d_angle_value_changed(GtkAdjustment *adj, GObject *dataKludge, Proj::Axis axis)
{
    SPDesktop *desktop = static_cast<SPDesktop *>(g_object_get_data( dataKludge, "desktop" ));
    SPDocument *document = desktop->getDocument();

    // quit if run by the attr_changed or selection changed listener
    if (g_object_get_data( dataKludge, "freeze" )) {
        return;
    }

    // in turn, prevent listener from responding
    g_object_set_data(dataKludge, "freeze", GINT_TO_POINTER(TRUE));

    std::list<Persp3D *> sel_persps = desktop->getSelection()->perspList();
    if (sel_persps.empty()) {
        // this can happen when the document is created; we silently ignore it
        return;
    }
    Persp3D *persp = sel_persps.front();

    persp->perspective_impl->tmat.set_infinite_direction (axis,
            gtk_adjustment_get_value(adj));
    persp->updateRepr();

    // TODO: use the correct axis here, too
    DocumentUndo::maybeDone(document, "perspangle", SP_VERB_CONTEXT_3DBOX, _("3D Box: Change perspective (angle of infinite axis)"));

    g_object_set_data( dataKludge, "freeze", GINT_TO_POINTER(FALSE) );
}

static void
sp_item_create_link(GtkMenuItem *menuitem, SPItem *item)
{
    g_assert(SP_IS_ITEM(item));
    g_assert(!SP_IS_ANCHOR(item));

    SPDesktop *desktop = (SPDesktop*)gtk_object_get_data(GTK_OBJECT(menuitem), "desktop");
    g_return_if_fail(desktop != NULL);

    Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
    Inkscape::XML::Node *repr = xml_doc->createElement("svg:a");
    SP_OBJECT_REPR(SP_OBJECT_PARENT(item))->addChild(repr, SP_OBJECT_REPR(item));
    SPObject *object = SP_OBJECT_DOCUMENT(item)->getObjectByRepr(repr);
    g_return_if_fail(SP_IS_ANCHOR(object));

    const char *id = SP_OBJECT_REPR(item)->attribute("id");
    Inkscape::XML::Node *child = SP_OBJECT_REPR(item)->duplicate(xml_doc);
    SP_OBJECT(item)->deleteObject(false);
    repr->addChild(child, NULL);
    child->setAttribute("id", id);

    Inkscape::GC::release(repr);
    Inkscape::GC::release(child);

    sp_document_done(SP_OBJECT_DOCUMENT(object), SP_VERB_NONE,
                     _("Create link"));

    sp_object_attributes_dialog(object, "SPAnchor");

    sp_desktop_selection(desktop)->set(SP_ITEM(object));
}

void
ExecutionEnv::cancel (void) {
    SPDesktop *desktop = (SPDesktop *)_doc;
    desktop->clearWaitingCursor();
    _effect->get_imp()->cancelProcessing();
    return;
}

static void
sp_select_context_setup(SPEventContext *ec)
{
    SPSelectContext *select_context = SP_SELECT_CONTEXT(ec);

    if (((SPEventContextClass *) parent_class)->setup) {
        ((SPEventContextClass *) parent_class)->setup(ec);
    }

    SPDesktop *desktop = ec->desktop;

    select_context->_describer = new Inkscape::SelectionDescriber(
                desktop->selection, 
                desktop->messageStack(),
                _("Click selection to toggle scale/rotation handles"),
                _("No objects selected. Click, Shift+click, or drag around objects to select.")
        );

    select_context->_seltrans = new Inkscape::SelTrans(desktop);

    sp_event_context_read(ec, "show");
    sp_event_context_read(ec, "transform");

    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    if (prefs->getBool("/tools/select/gradientdrag")) {
        ec->enableGrDrag();
    }
}

static void sp_pencil_tb_tolerance_value_changed(GtkAdjustment *adj, GObject *tbl)
{
    // quit if run by the attr_changed listener
    if (g_object_get_data( tbl, "freeze" )) {
        return;
    }
    // in turn, prevent listener from responding
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    g_object_set_data( tbl, "freeze", GINT_TO_POINTER(TRUE) );
    prefs->setDouble("/tools/freehand/pencil/tolerance",
            gtk_adjustment_get_value(adj));
    g_object_set_data( tbl, "freeze", GINT_TO_POINTER(FALSE) );
    SPDesktop *desktop = static_cast<SPDesktop *>(g_object_get_data(tbl, "desktop"));
    std::vector<SPItem *> selected = desktop->getSelection()->itemList();
    for (std::vector<SPItem *>::iterator it(selected.begin()); it != selected.end(); ++it){
        SPLPEItem* lpeitem = dynamic_cast<SPLPEItem*>(*it);
        if (lpeitem && lpeitem->hasPathEffect()){
            Inkscape::LivePathEffect::Effect* simplify = lpeitem->getPathEffectOfType(Inkscape::LivePathEffect::SIMPLIFY);
            if(simplify){
                Inkscape::LivePathEffect::LPESimplify *lpe_simplify = dynamic_cast<Inkscape::LivePathEffect::LPESimplify*>(simplify->getLPEObj()->get_lpe());
                if (lpe_simplify) {
                    double tol = prefs->getDoubleLimited("/tools/freehand/pencil/tolerance", 10.0, 1.0, 100.0);
                    tol = tol/(100.0*(102.0-tol));
                    std::ostringstream ss;
                    ss << tol;
                    Inkscape::LivePathEffect::Effect* powerstroke = lpeitem->getPathEffectOfType(Inkscape::LivePathEffect::POWERSTROKE);
                    bool simplified = false;
                    if(powerstroke){
                        Inkscape::LivePathEffect::LPEPowerStroke *lpe_powerstroke = dynamic_cast<Inkscape::LivePathEffect::LPEPowerStroke*>(powerstroke->getLPEObj()->get_lpe());
                        if(lpe_powerstroke){
                            lpe_powerstroke->getRepr()->setAttribute("is_visible", "false");
                            sp_lpe_item_update_patheffect(lpeitem, false, false);
                            SPShape *sp_shape = dynamic_cast<SPShape *>(lpeitem);
                            if (sp_shape) {
                                guint previous_curve_length = sp_shape->getCurve()->get_segment_count();
                                lpe_simplify->getRepr()->setAttribute("threshold", ss.str());
                                sp_lpe_item_update_patheffect(lpeitem, false, false);
                                simplified = true;
                                guint curve_length = sp_shape->getCurve()->get_segment_count();
                                std::vector<Geom::Point> ts = lpe_powerstroke->offset_points.data();
                                double factor = (double)curve_length/ (double)previous_curve_length;
                                for (size_t i = 0; i < ts.size(); i++) {
                                    ts[i][Geom::X] = ts[i][Geom::X] * factor;
                                }
                                lpe_powerstroke->offset_points.param_setValue(ts);
                            }
                            lpe_powerstroke->getRepr()->setAttribute("is_visible", "true");
                            sp_lpe_item_update_patheffect(lpeitem, false, false);
                        }
                    }
                    if(!simplified){
                        lpe_simplify->getRepr()->setAttribute("threshold", ss.str());
                    }
                }
            }
        }
    }
}

static void
sp_arctb_startend_value_changed(GtkAdjustment *adj, GObject *tbl, gchar const *value_name, gchar const *other_name)
{
    SPDesktop *desktop = static_cast<SPDesktop *>(g_object_get_data( tbl, "desktop" ));

    if (DocumentUndo::getUndoSensitive(desktop->getDocument())) {
        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
        prefs->setDouble(Glib::ustring("/tools/shapes/arc/") + value_name, gtk_adjustment_get_value(adj));
    }

    // quit if run by the attr_changed listener
    if (g_object_get_data( tbl, "freeze" )) {
        return;
    }

    // in turn, prevent listener from responding
    g_object_set_data( tbl, "freeze", GINT_TO_POINTER(TRUE) );

    gchar* namespaced_name = g_strconcat("sodipodi:", value_name, NULL);

    bool modmade = false;
    std::vector<SPItem*> itemlist=desktop->getSelection()->itemList();
    for(std::vector<SPItem*>::const_iterator i=itemlist.begin();i!=itemlist.end();i++){
        SPItem *item = *i;
        if (SP_IS_GENERICELLIPSE(item)) {

            SPGenericEllipse *ge = SP_GENERICELLIPSE(item);

            if (!strcmp(value_name, "start")) {
                ge->start = (gtk_adjustment_get_value(adj) * M_PI)/ 180;
            } else {
                ge->end = (gtk_adjustment_get_value(adj) * M_PI)/ 180;
            }

            ge->normalize();
            (SP_OBJECT(ge))->updateRepr();
            (SP_OBJECT(ge))->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);

            modmade = true;
        }
    }

    g_free(namespaced_name);

    GtkAdjustment *other = GTK_ADJUSTMENT( g_object_get_data( tbl, other_name ) );

    sp_arctb_sensitivize( tbl, gtk_adjustment_get_value(adj), gtk_adjustment_get_value(other) );

    if (modmade) {
        DocumentUndo::maybeDone(desktop->getDocument(), value_name, SP_VERB_CONTEXT_ARC,
                                _("Arc: Change start/end"));
    }

    g_object_set_data( tbl, "freeze", GINT_TO_POINTER(FALSE) );
}

static void
sp_selection_layout_widget_modify_selection(SPWidget *spw, Inkscape::Selection *selection, guint flags, gpointer data)
{
    SPDesktop *desktop = static_cast<SPDesktop *>(data);
    if ((desktop->getSelection() == selection) // only respond to changes in our desktop
        && (flags & (SP_OBJECT_MODIFIED_FLAG        |
                     SP_OBJECT_PARENT_MODIFIED_FLAG |
                     SP_OBJECT_CHILD_MODIFIED_FLAG   )))
    {
        sp_selection_layout_widget_update(spw, selection);
    }
}

static void toggle_pattern( GtkToggleAction* act, gpointer data )
{
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    gboolean active = gtk_toggle_action_get_active(act);
    prefs->setInt("/options/transform/pattern", active);
    SPDesktop *desktop = static_cast<SPDesktop *>(data);
    if ( active ) {
        desktop->messageStack()->flash(Inkscape::INFORMATION_MESSAGE, _("Now <b>patterns</b> are <b>transformed</b> along with their objects when those are transformed (moved, scaled, rotated, or skewed)."));
    } else {
        desktop->messageStack()->flash(Inkscape::INFORMATION_MESSAGE, _("Now <b>patterns</b> remain <b>fixed</b> when objects are transformed (moved, scaled, rotated, or skewed)."));
    }
}

static void toggle_stroke( GtkToggleAction* act, gpointer data )
{
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    gboolean active = gtk_toggle_action_get_active(act);
    prefs->setBool("/options/transform/stroke", active);
    SPDesktop *desktop = static_cast<SPDesktop *>(data);
    if ( active ) {
        desktop->messageStack()->flash(Inkscape::INFORMATION_MESSAGE, _("Now <b>stroke width</b> is <b>scaled</b> when objects are scaled."));
    } else {
        desktop->messageStack()->flash(Inkscape::INFORMATION_MESSAGE, _("Now <b>stroke width</b> is <b>not scaled</b> when objects are scaled."));
    }
}

static void toggle_corners( GtkToggleAction* act, gpointer data)
{
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    gboolean active = gtk_toggle_action_get_active(act);
    prefs->setBool("/options/transform/rectcorners", active);
    SPDesktop *desktop = static_cast<SPDesktop *>(data);
    if ( active ) {
        desktop->messageStack()->flash(Inkscape::INFORMATION_MESSAGE, _("Now <b>rounded rectangle corners</b> are <b>scaled</b> when rectangles are scaled."));
    } else {
        desktop->messageStack()->flash(Inkscape::INFORMATION_MESSAGE, _("Now <b>rounded rectangle corners</b> are <b>not scaled</b> when rectangles are scaled."));
    }
}

/*
 * User selected a stop from the combobox
 */
static void gr_stop_combo_changed(GtkComboBox * /*widget*/, GtkWidget *data)
{
    if (blocked) {
        return;
    }

    SPDesktop *desktop = static_cast<SPDesktop *>(g_object_get_data(G_OBJECT(data), "desktop"));
    ToolBase *ev = desktop->getEventContext();
    SPGradient *gr = gr_get_selected_gradient(data);

    select_drag_by_stop(data, gr, ev);
}

void
ExecutionEnv::run (void) {
    _state = ExecutionEnv::RUNNING;
    if (_show_working) {
        createWorkingDialog();
    }
    SPDesktop *desktop = (SPDesktop *)_doc;
    desktop->setWaitingCursor();
    _effect->get_imp()->effect(_effect, _doc, _docCache);
    desktop->clearWaitingCursor();
    _state = ExecutionEnv::COMPLETE;
    // _runComplete.signal();
    return;
}

static void sp_arctb_open_state_changed( EgeSelectOneAction *act, GObject *tbl )
{
    SPDesktop *desktop = static_cast<SPDesktop *>(g_object_get_data( tbl, "desktop" ));
    if (DocumentUndo::getUndoSensitive(desktop->getDocument())) {
        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
        prefs->setBool("/tools/shapes/arc/open", ege_select_one_action_get_active(act) != 0);
    }

    // quit if run by the attr_changed listener
    if (g_object_get_data( tbl, "freeze" )) {
        return;
    }

    // in turn, prevent listener from responding
    g_object_set_data( tbl, "freeze", GINT_TO_POINTER(TRUE) );

    bool modmade = false;

    if ( ege_select_one_action_get_active(act) != 0 ) {
    	std::vector<SPItem*> itemlist=desktop->getSelection()->itemList();
        for(std::vector<SPItem*>::const_iterator i=itemlist.begin();i!=itemlist.end();i++){
            SPItem *item = *i;
            if (SP_IS_GENERICELLIPSE(item)) {
                Inkscape::XML::Node *repr = item->getRepr();
                repr->setAttribute("sodipodi:open", "true");
                item->updateRepr();
                modmade = true;
            }
        }
    } else {
    	std::vector<SPItem*> itemlist=desktop->getSelection()->itemList();
        for(std::vector<SPItem*>::const_iterator i=itemlist.begin();i!=itemlist.end();i++){
            SPItem *item = *i;
            if (SP_IS_GENERICELLIPSE(item)) {
                Inkscape::XML::Node *repr = item->getRepr();
                repr->setAttribute("sodipodi:open", NULL);
                item->updateRepr();
                modmade = true;
            }
        }
    }

    if (modmade) {
        DocumentUndo::done(desktop->getDocument(), SP_VERB_CONTEXT_ARC,
                           _("Arc: Change open/closed"));
    }

    g_object_set_data( tbl, "freeze", GINT_TO_POINTER(FALSE) );
}

void sp_find_dialog_find(GObject *, GObject *dlg)
{
    SPDesktop *desktop = SP_ACTIVE_DESKTOP;

    bool hidden = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (gtk_object_get_data (GTK_OBJECT (dlg), "includehidden")));
    bool locked = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (gtk_object_get_data (GTK_OBJECT (dlg), "includelocked")));

    GSList *l = NULL;
    if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (gtk_object_get_data (GTK_OBJECT (dlg), "inselection")))) {
        if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (gtk_object_get_data (GTK_OBJECT (dlg), "inlayer")))) {
            l = all_selection_items (desktop->selection, l, desktop->currentLayer(), hidden, locked);
        } else {
            l = all_selection_items (desktop->selection, l, NULL, hidden, locked);
        }
    } else {
        if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (gtk_object_get_data (GTK_OBJECT (dlg), "inlayer")))) {
            l = all_items (desktop->currentLayer(), l, hidden, locked);
        } else {
            l = all_items (SP_DOCUMENT_ROOT (sp_desktop_document (desktop)), l, hidden, locked);
        }
    }
    guint all = g_slist_length (l);

    bool exact = true;
    GSList *n = NULL;
    n = filter_list (l, dlg, exact);
    if (n == NULL) {
        exact = false;
        n = filter_list (l, dlg, exact);
    }

    if (n != NULL) {
        int count = g_slist_length (n);
        desktop->messageStack()->flashF(Inkscape::NORMAL_MESSAGE,
                                        // TRANSLATORS: "%s" is replaced with "exact" or "partial" when this string is displayed
                                        ngettext("<b>%d</b> object found (out of <b>%d</b>), %s match.",
                                                 "<b>%d</b> objects found (out of <b>%d</b>), %s match.",
                                                 count),
                                        count, all, exact? _("exact") : _("partial"));

        Inkscape::Selection *selection = sp_desktop_selection (desktop);
        selection->clear();
        selection->setList(n);
        scroll_to_show_item (desktop, SP_ITEM(n->data));
    } else {
        desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("No objects found"));
    }
}

static void sp_rtb_value_changed(GtkAdjustment *adj, GObject *tbl, gchar const *value_name,
                                 void (SPRect::*setter)(gdouble))
{
    SPDesktop *desktop = static_cast<SPDesktop *>(g_object_get_data( tbl, "desktop" ));

    UnitTracker* tracker = reinterpret_cast<UnitTracker*>(g_object_get_data( tbl, "tracker" ));
    Unit const *unit = tracker->getActiveUnit();
    g_return_if_fail(unit != NULL);

    if (DocumentUndo::getUndoSensitive(desktop->getDocument())) {
        Inkscape::Preferences *prefs = Inkscape::Preferences::get();
        prefs->setDouble(Glib::ustring("/tools/shapes/rect/") + value_name,
            Quantity::convert(gtk_adjustment_get_value(adj), unit, "px"));
    }

    // quit if run by the attr_changed listener
    if (g_object_get_data( tbl, "freeze" ) || tracker->isUpdating()) {
        return;
    }

    // in turn, prevent listener from responding
    g_object_set_data( tbl, "freeze", GINT_TO_POINTER(TRUE));

    bool modmade = false;
    Inkscape::Selection *selection = desktop->getSelection();
    std::vector<SPItem*> itemlist=selection->itemList();
    for(std::vector<SPItem*>::const_iterator i=itemlist.begin();i!=itemlist.end();++i){
        if (SP_IS_RECT(*i)) {
            if (gtk_adjustment_get_value(adj) != 0) {
                (SP_RECT(*i)->*setter)(Quantity::convert(gtk_adjustment_get_value(adj), unit, "px"));
            } else {
                (*i)->getRepr()->setAttribute(value_name, NULL);
            }
            modmade = true;
        }
    }

    sp_rtb_sensitivize( tbl );

    if (modmade) {
        DocumentUndo::done(desktop->getDocument(), SP_VERB_CONTEXT_RECT,
                           _("Change rectangle"));
    }

    g_object_set_data( tbl, "freeze", GINT_TO_POINTER(FALSE) );
}

static void
sp_gradient_context_add_stop_near_point (SPGradientContext *rc, SPItem *item,  Geom::Point mouse_p, guint32 /*etime*/)
{
    // item is the selected item. mouse_p the location in doc coordinates of where to add the stop

    SPEventContext *ec = SP_EVENT_CONTEXT(rc);
    SPDesktop *desktop = SP_EVENT_CONTEXT (rc)->desktop;

    double tolerance = (double) ec->tolerance;

    ec->get_drag()->addStopNearPoint (item, mouse_p, tolerance/desktop->current_zoom());

    sp_document_done (sp_desktop_document (desktop), SP_VERB_CONTEXT_GRADIENT,
                      _("Add gradient stop"));

    ec->get_drag()->updateDraggers();
}