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gradient-vector.cpp

/*
 * Gradient vector selection widget
 *
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   bulia byak <buliabyak@users.sf.net>
 *   MenTaLguY <mental@rydia.net>
 *   Jon A. Cruz <jon@joncruz.org>
 *
 * Copyright (C) 2001-2002 Lauris Kaplinski
 * Copyright (C) 2001 Ximian, Inc.
 * Copyright (C) 2004 Monash University
 * Copyright (C) 2004 David Turner
 * Copyright (C) 2006 MenTaLguY
 * Copyright (C) 2010 Jon A. Cruz
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 *
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
#endif
#include <gtk/gtk.h>
#include "macros.h"
#include <glibmm/i18n.h>
#include "../widgets/gradient-image.h"
#include "../inkscape.h"
#include "../document-private.h"
#include "../gradient-chemistry.h"
#include "gradient-vector.h"
#include "../helper/window.h"

#include "xml/repr.h"

#include "../dialogs/dialog-events.h"
#include "../preferences.h"
#include "svg/css-ostringstream.h"
#include "sp-stop.h"

#include <sigc++/functors/ptr_fun.h>
#include <sigc++/adaptors/bind.h>

enum {
    VECTOR_SET,
    LAST_SIGNAL
};

static void sp_gradient_vector_selector_class_init(SPGradientVectorSelectorClass *klass);
static void sp_gradient_vector_selector_init(SPGradientVectorSelector *gvs);
static void sp_gradient_vector_selector_destroy(GtkObject *object);

static void sp_gvs_gradient_release(SPObject *obj, SPGradientVectorSelector *gvs);
static void sp_gvs_defs_release(SPObject *defs, SPGradientVectorSelector *gvs);
static void sp_gvs_defs_modified(SPObject *defs, guint flags, SPGradientVectorSelector *gvs);

static void sp_gvs_rebuild_gui_full(SPGradientVectorSelector *gvs);
static void sp_gvs_gradient_activate(GtkMenuItem *mi, SPGradientVectorSelector *gvs);

static GtkVBoxClass *parent_class;
static guint signals[LAST_SIGNAL] = {0};

// TODO FIXME kill these globals!!!
static GtkWidget *dlg = NULL;
static win_data wd;
static gint x = -1000, y = -1000, w = 0, h = 0; // impossible original values to make sure they are read from prefs
static Glib::ustring const prefs_path = "/dialogs/gradienteditor/";

GType sp_gradient_vector_selector_get_type(void)
{
    static GType type = 0;
    if (!type) {
        static const GTypeInfo info = {
            sizeof(SPGradientVectorSelectorClass),
            NULL, /* base_init */
            NULL, /* base_finalize */
            reinterpret_cast<GClassInitFunc>(sp_gradient_vector_selector_class_init),
            NULL, /* class_finalize */
            NULL, /* class_data */
            sizeof(SPGradientVectorSelector),
            0,    /* n_preallocs */
            reinterpret_cast<GInstanceInitFunc>(sp_gradient_vector_selector_init),
            0,    /* value_table */
        };

        type = g_type_register_static( GTK_TYPE_VBOX,
                                       "SPGradientVectorSelector",
                                       &info,
                                       static_cast< GTypeFlags >(0) );
    }
    return type;
}

static void sp_gradient_vector_selector_class_init(SPGradientVectorSelectorClass *klass)
{
    GtkObjectClass *object_class;

    object_class = GTK_OBJECT_CLASS(klass);

    parent_class = static_cast<GtkVBoxClass*>(gtk_type_class(GTK_TYPE_VBOX));

    signals[VECTOR_SET] = gtk_signal_new( "vector_set",
                                          GTK_RUN_LAST,
                                          GTK_CLASS_TYPE(object_class),
                                          GTK_SIGNAL_OFFSET(SPGradientVectorSelectorClass, vector_set),
                                          gtk_marshal_NONE__POINTER,
                                          GTK_TYPE_NONE, 1,
                                          GTK_TYPE_POINTER);

    object_class->destroy = sp_gradient_vector_selector_destroy;
}

static void sp_gradient_vector_selector_init(SPGradientVectorSelector *gvs)
{
    gvs->idlabel = TRUE;

    gvs->swatched = false;

    gvs->doc = NULL;
    gvs->gr = NULL;

    new (&gvs->gradient_release_connection) sigc::connection();
    new (&gvs->defs_release_connection) sigc::connection();
    new (&gvs->defs_modified_connection) sigc::connection();

    gvs->menu = gtk_option_menu_new();
    gtk_widget_show(gvs->menu);
    gtk_box_pack_start(GTK_BOX(gvs), gvs->menu, TRUE, TRUE, 0);
}

static void sp_gradient_vector_selector_destroy(GtkObject *object)
{
    SPGradientVectorSelector *gvs = SP_GRADIENT_VECTOR_SELECTOR(object);

    if (gvs->gr) {
        gvs->gradient_release_connection.disconnect();
        gvs->gr = NULL;
    }

    if (gvs->doc) {
        gvs->defs_release_connection.disconnect();
        gvs->defs_modified_connection.disconnect();
        gvs->doc = NULL;
    }

    gvs->gradient_release_connection.~connection();
    gvs->defs_release_connection.~connection();
    gvs->defs_modified_connection.~connection();

    if ((reinterpret_cast<GtkObjectClass *>(parent_class))->destroy) {
        (* (reinterpret_cast<GtkObjectClass *>(parent_class))->destroy) (object);
    }
}

GtkWidget *sp_gradient_vector_selector_new(SPDocument *doc, SPGradient *gr)
{
    GtkWidget *gvs;

    g_return_val_if_fail(!gr || SP_IS_GRADIENT(gr), NULL);
    g_return_val_if_fail(!gr || (SP_OBJECT_DOCUMENT(gr) == doc), NULL);

    gvs = static_cast<GtkWidget*>(gtk_type_new(SP_TYPE_GRADIENT_VECTOR_SELECTOR));

    if (doc) {
        sp_gradient_vector_selector_set_gradient(SP_GRADIENT_VECTOR_SELECTOR(gvs), doc, gr);
    } else {
        sp_gvs_rebuild_gui_full(SP_GRADIENT_VECTOR_SELECTOR(gvs));
    }

    return gvs;
}

void sp_gradient_vector_selector_set_gradient(SPGradientVectorSelector *gvs, SPDocument *doc, SPGradient *gr)
{
//     g_message("sp_gradient_vector_selector_set_gradient(%p, %p, %p) [%s] %d %d", gvs, doc, gr,
//               (gr ? gr->getId():"N/A"),
//               (gr ? gr->isSwatch() : -1),
//               (gr ? gr->isSolid() : -1));
    static gboolean suppress = FALSE;

    g_return_if_fail(gvs != NULL);
    g_return_if_fail(SP_IS_GRADIENT_VECTOR_SELECTOR(gvs));
    g_return_if_fail(!gr || (doc != NULL));
    g_return_if_fail(!gr || SP_IS_GRADIENT(gr));
    g_return_if_fail(!gr || (SP_OBJECT_DOCUMENT(gr) == doc));
    g_return_if_fail(!gr || gr->hasStops());

    if (doc != gvs->doc) {
        /* Disconnect signals */
        if (gvs->gr) {
            gvs->gradient_release_connection.disconnect();
            gvs->gr = NULL;
        }
        if (gvs->doc) {
            gvs->defs_release_connection.disconnect();
            gvs->defs_modified_connection.disconnect();
            gvs->doc = NULL;
        }

        // Connect signals
        if (doc) {
            gvs->defs_release_connection = SP_DOCUMENT_DEFS(doc)->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_gvs_defs_release), gvs));
            gvs->defs_modified_connection = SP_DOCUMENT_DEFS(doc)->connectModified(sigc::bind<2>(sigc::ptr_fun(&sp_gvs_defs_modified), gvs));
        }
        if (gr) {
            gvs->gradient_release_connection = gr->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_gvs_gradient_release), gvs));
        }
        gvs->doc = doc;
        gvs->gr = gr;
        sp_gvs_rebuild_gui_full(gvs);
        if (!suppress) g_signal_emit(G_OBJECT(gvs), signals[VECTOR_SET], 0, gr);
    } else if (gr != gvs->gr) {
        // Harder case - keep document, rebuild menus and stuff
        // fixme: (Lauris)
        suppress = TRUE;
        sp_gradient_vector_selector_set_gradient(gvs, NULL, NULL);
        sp_gradient_vector_selector_set_gradient(gvs, doc, gr);
        suppress = FALSE;
        g_signal_emit(G_OBJECT(gvs), signals[VECTOR_SET], 0, gr);
    }
    /* The case of setting NULL -> NULL is not very interesting */
}

SPDocument *sp_gradient_vector_selector_get_document(SPGradientVectorSelector *gvs)
{
    g_return_val_if_fail(gvs != NULL, NULL);
    g_return_val_if_fail(SP_IS_GRADIENT_VECTOR_SELECTOR(gvs), NULL);

    return gvs->doc;
}

SPGradient *sp_gradient_vector_selector_get_gradient(SPGradientVectorSelector *gvs)
{
    g_return_val_if_fail(gvs != NULL, NULL);
    g_return_val_if_fail(SP_IS_GRADIENT_VECTOR_SELECTOR(gvs), NULL);

    return gvs->gr;
}

static void sp_gvs_rebuild_gui_full(SPGradientVectorSelector *gvs)
{
    /* Clear old menu, if there is any */
    if (gtk_option_menu_get_menu(GTK_OPTION_MENU(gvs->menu))) {
        gtk_option_menu_remove_menu(GTK_OPTION_MENU(gvs->menu));
    }

    /* Create new menu widget */
    GtkWidget *m = gtk_menu_new();
    gtk_widget_show(m);

    /* Pick up all gradients with vectors */
    GSList *gl = NULL;
    if (gvs->gr) {
        const GSList *gradients = sp_document_get_resource_list(SP_OBJECT_DOCUMENT(gvs->gr), "gradient");
        for (const GSList *curr = gradients; curr; curr = curr->next) {
            SPGradient* grad = SP_GRADIENT(curr->data);
            if ( grad->hasStops() && (grad->isSwatch() == gvs->swatched) ) {
                gl = g_slist_prepend(gl, curr->data);
            }
        }
    }
    gl = g_slist_reverse(gl);

    gint pos = 0;
    gint idx = 0;

    if (!gvs->doc) {
        GtkWidget *i;
        i = gtk_menu_item_new_with_label(_("No document selected"));
        gtk_widget_show(i);
        gtk_menu_append(GTK_MENU(m), i);
        gtk_widget_set_sensitive(gvs->menu, FALSE);
    } else if (!gl) {
        GtkWidget *i;
        i = gtk_menu_item_new_with_label(_("No gradients in document"));
        gtk_widget_show(i);
        gtk_menu_append(GTK_MENU(m), i);
        gtk_widget_set_sensitive(gvs->menu, FALSE);
    } else if (!gvs->gr) {
        GtkWidget *i;
        i = gtk_menu_item_new_with_label(_("No gradient selected"));
        gtk_widget_show(i);
        gtk_menu_append(GTK_MENU(m), i);
        gtk_widget_set_sensitive(gvs->menu, FALSE);
    } else {
        while (gl) {
            SPGradient *gr;
            GtkWidget *i, *w;
            gr = SP_GRADIENT(gl->data);
            gl = g_slist_remove(gl, gr);

            /* We have to know: */
            /* Gradient destroy */
            /* Gradient name change */
            i = gtk_menu_item_new();
            gtk_widget_show(i);
            g_object_set_data(G_OBJECT(i), "gradient", gr);
            g_signal_connect(G_OBJECT(i), "activate", G_CALLBACK(sp_gvs_gradient_activate), gvs);

            w = sp_gradient_image_new(gr);
            gtk_widget_show(w);

            if (gvs->idlabel) {
                GtkWidget *hb, *l;
                hb = gtk_hbox_new(FALSE, 4);
                gtk_widget_show(hb);
                l = gtk_label_new(gr->getId());
                gtk_widget_show(l);
                gtk_misc_set_alignment(GTK_MISC(l), 1.0, 0.5);
                gtk_box_pack_start(GTK_BOX(hb), l, TRUE, TRUE, 0);
                gtk_box_pack_start(GTK_BOX(hb), w, FALSE, FALSE, 0);
                w = hb;
            }

            gtk_container_add(GTK_CONTAINER(i), w);

            gtk_menu_append(GTK_MENU(m), i);

            if (gr == gvs->gr) {
                pos = idx;
            }
            idx += 1;
        }
        gtk_widget_set_sensitive(gvs->menu, TRUE);
    }

    gtk_option_menu_set_menu(GTK_OPTION_MENU(gvs->menu), m);
    /* Set history */
    gtk_option_menu_set_history(GTK_OPTION_MENU(gvs->menu), pos);
}

static void sp_gvs_gradient_activate(GtkMenuItem *mi, SPGradientVectorSelector *gvs)
{
    SPGradient *gr, *norm;

    gr = (SPGradient*)g_object_get_data(G_OBJECT(mi), "gradient");
    /* Hmmm... bad things may happen here, if actual gradient is something new */
    /* Namely - menuitems etc. will be fucked up */
    /* Hmmm - probably we can just re-set it as menuitem data (Lauris) */

    //g_print("SPGradientVectorSelector: gradient %s activated\n", SP_OBJECT_ID(gr));
    //g_message("Setting to gradient %p   swatch:%d   solid:%d", gr, gr->isSwatch(), gr->isSolid());

    norm = sp_gradient_ensure_vector_normalized(gr);
    if (norm != gr) {
        //g_print("SPGradientVectorSelector: become %s after normalization\n", SP_OBJECT_ID(norm));
        /* But be careful that we do not have gradient saved anywhere else */
        g_object_set_data(G_OBJECT(mi), "gradient", norm);
    }

    /* fixme: Really we would want to use _set_vector */
    /* Detach old */
    if (gvs->gr) {
        gvs->gradient_release_connection.disconnect();
        gvs->gr = NULL;
    }
    /* Attach new */
    if (norm) {
        gvs->gradient_release_connection = norm->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_gvs_gradient_release), gvs));
        gvs->gr = norm;
    }

    g_signal_emit(G_OBJECT(gvs), signals[VECTOR_SET], 0, norm);

    if (norm != gr) {
        /* We do extra undo push here */
        /* If handler has already done it, it is just NOP */
        // FIXME: looks like this is never a valid undo step, consider removing this
        sp_document_done(SP_OBJECT_DOCUMENT(norm), SP_VERB_CONTEXT_GRADIENT,
                          /* TODO: annotate */ "gradient-vector.cpp:350");
    }
}

static void sp_gvs_gradient_release(SPObject */*obj*/, SPGradientVectorSelector *gvs)
{
    /* Disconnect gradient */
    if (gvs->gr) {
        gvs->gradient_release_connection.disconnect();
        gvs->gr = NULL;
    }

    /* Rebuild GUI */
    sp_gvs_rebuild_gui_full(gvs);
}

static void sp_gvs_defs_release(SPObject */*defs*/, SPGradientVectorSelector *gvs)
{
    gvs->doc = NULL;

    gvs->defs_release_connection.disconnect();
    gvs->defs_modified_connection.disconnect();

    /* Disconnect gradient as well */
    if (gvs->gr) {
        gvs->gradient_release_connection.disconnect();
        gvs->gr = NULL;
    }

    /* Rebuild GUI */
    sp_gvs_rebuild_gui_full(gvs);
}

static void sp_gvs_defs_modified(SPObject */*defs*/, guint /*flags*/, SPGradientVectorSelector *gvs)
{
    /* fixme: We probably have to check some flags here (Lauris) */

    sp_gvs_rebuild_gui_full(gvs);
}

void SPGradientVectorSelector::setSwatched()
{
    swatched = true;
    sp_gvs_rebuild_gui_full(this);
}

/*##################################################################
  ###                 Vector Editing Widget
  ##################################################################*/

#include "../widgets/sp-color-notebook.h"
#include "../widgets/sp-color-preview.h"
#include "../widgets/widget-sizes.h"
#include "../xml/node-event-vector.h"
#include "../svg/svg-color.h"


#define PAD 4

static GtkWidget *sp_gradient_vector_widget_new(SPGradient *gradient, SPStop *stop);

static void sp_gradient_vector_widget_load_gradient(GtkWidget *widget, SPGradient *gradient);
static gint sp_gradient_vector_dialog_delete(GtkWidget *widget, GdkEvent *event, GtkWidget *dialog);
static void sp_gradient_vector_dialog_destroy(GtkObject *object, gpointer data);

static void sp_gradient_vector_widget_destroy(GtkObject *object, gpointer data);
static void sp_gradient_vector_gradient_release(SPObject *obj, GtkWidget *widget);
static void sp_gradient_vector_gradient_modified(SPObject *obj, guint flags, GtkWidget *widget);
static void sp_gradient_vector_color_dragged(SPColorSelector *csel, GtkObject *object);
static void sp_gradient_vector_color_changed(SPColorSelector *csel, GtkObject *object);
static void update_stop_list( GtkWidget *mnu, SPGradient *gradient, SPStop *new_stop);

static gboolean blocked = FALSE;

static void grad_edit_dia_stop_added_or_removed(Inkscape::XML::Node */*repr*/, Inkscape::XML::Node */*child*/, Inkscape::XML::Node */*ref*/, gpointer data)
{
    GtkWidget *vb = GTK_WIDGET(data);
    GtkWidget *mnu = (GtkWidget *)g_object_get_data(G_OBJECT(vb), "stopmenu");
    SPGradient *gradient = (SPGradient *)g_object_get_data(G_OBJECT(vb), "gradient");
    update_stop_list(mnu, gradient, NULL);
}

//FIXME!!! We must also listen to attr changes on all children (i.e. stops) too,
//otherwise the dialog does not reflect undoing color or offset change. This is a major
//hassle, unless we have a "one of the descendants changed in some way" signal.
static Inkscape::XML::NodeEventVector grad_edit_dia_repr_events =
{
    grad_edit_dia_stop_added_or_removed, /* child_added */
    grad_edit_dia_stop_added_or_removed, /* child_removed */
    NULL, /* attr_changed*/
    NULL, /* content_changed */
    NULL  /* order_changed */
};

static void verify_grad(SPGradient *gradient)
{
    int i = 0;
    SPStop *stop = NULL;
    /* count stops */
    for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
        if (SP_IS_STOP(ochild)) {
            i++;
            stop = SP_STOP(ochild);
        }
    }

    Inkscape::XML::Document *xml_doc;
    xml_doc = SP_OBJECT_REPR(gradient)->document();

    if (i < 1) {
        Inkscape::CSSOStringStream os;
        os << "stop-color: #000000;stop-opacity:" << 1.0 << ";";

        Inkscape::XML::Node *child;

        child = xml_doc->createElement("svg:stop");
        sp_repr_set_css_double(child, "offset", 0.0);
        child->setAttribute("style", os.str().c_str());
        SP_OBJECT_REPR(gradient)->addChild(child, NULL);
        Inkscape::GC::release(child);

        child = xml_doc->createElement("svg:stop");
        sp_repr_set_css_double(child, "offset", 1.0);
        child->setAttribute("style", os.str().c_str());
        SP_OBJECT_REPR(gradient)->addChild(child, NULL);
        Inkscape::GC::release(child);
    }
    if (i < 2) {
        sp_repr_set_css_double(SP_OBJECT_REPR(stop), "offset", 0.0);
        Inkscape::XML::Node *child = SP_OBJECT_REPR(stop)->duplicate(SP_OBJECT_REPR(gradient)->document());
        sp_repr_set_css_double(child, "offset", 1.0);
        SP_OBJECT_REPR(gradient)->addChild(child, SP_OBJECT_REPR(stop));
        Inkscape::GC::release(child);
    }
}

static void select_stop_in_list( GtkWidget *mnu, SPGradient *gradient, SPStop *new_stop)
{
    int i = 0;
    for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
        if (SP_IS_STOP(ochild)) {
            if (SP_OBJECT(ochild) == SP_OBJECT(new_stop)) {
                gtk_option_menu_set_history(GTK_OPTION_MENU(mnu), i);
                break;
            }
            i++;
        }
    }
}

static void update_stop_list( GtkWidget *mnu, SPGradient *gradient, SPStop *new_stop)
{

    if (!SP_IS_GRADIENT(gradient)) {
        return;
    }

    blocked = TRUE;

    /* Clear old menu, if there is any */
    if (gtk_option_menu_get_menu(GTK_OPTION_MENU(mnu))) {
        gtk_option_menu_remove_menu(GTK_OPTION_MENU(mnu));
    }

    /* Create new menu widget */
    GtkWidget *m = gtk_menu_new();
    gtk_widget_show(m);
    GSList *sl = NULL;
    if ( gradient->hasStops() ) {
        for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
            if (SP_IS_STOP(ochild)) {
                sl = g_slist_append(sl, ochild);
            }
        }
    }
    if (!sl) {
        GtkWidget *i = gtk_menu_item_new_with_label(_("No stops in gradient"));
        gtk_widget_show(i);
        gtk_menu_append(GTK_MENU(m), i);
        gtk_widget_set_sensitive(mnu, FALSE);
    } else {

        for (; sl != NULL; sl = sl->next){
            if (SP_IS_STOP(sl->data)){
                SPStop *stop = SP_STOP(sl->data);
                GtkWidget *i = gtk_menu_item_new();
                gtk_widget_show(i);
                g_object_set_data(G_OBJECT(i), "stop", stop);
                GtkWidget *hb = gtk_hbox_new(FALSE, 4);
                GtkWidget *cpv = sp_color_preview_new(sp_stop_get_rgba32(stop));
                gtk_widget_show(cpv);
                gtk_container_add( GTK_CONTAINER(hb), cpv );
                g_object_set_data( G_OBJECT(i), "preview", cpv );
                Inkscape::XML::Node *repr = SP_OBJECT_REPR((SPItem *) sl->data);
                GtkWidget *l = gtk_label_new(repr->attribute("id"));
                gtk_widget_show(l);
                gtk_misc_set_alignment(GTK_MISC(l), 1.0, 0.5);
                gtk_box_pack_start(GTK_BOX(hb), l, TRUE, TRUE, 0);
                gtk_widget_show(hb);
                gtk_container_add(GTK_CONTAINER(i), hb);
                gtk_menu_append(GTK_MENU(m), i);
            }
        }

        gtk_widget_set_sensitive(mnu, TRUE);
    }
    gtk_option_menu_set_menu(GTK_OPTION_MENU(mnu), m);

    /* Set history */
    if (new_stop == NULL) {
        gtk_option_menu_set_history(GTK_OPTION_MENU(mnu), 0);
    } else {
        select_stop_in_list(mnu, gradient, new_stop);
    }

    blocked = FALSE;
}


// user selected existing stop from list
static void sp_grad_edit_select(GtkOptionMenu *mnu, GtkWidget *tbl)
{
    GObject *item = G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu))));
    SPStop *stop = SP_STOP(g_object_get_data(item, "stop"));
    if (!stop) {
        return;
    }

    blocked = TRUE;

    SPColorSelector *csel = (SPColorSelector*)g_object_get_data(G_OBJECT(tbl), "cselector");
    // set its color, from the stored array
    csel->base->setColorAlpha( stop->getEffectiveColor(), stop->opacity );
    GtkWidget *offspin = GTK_WIDGET(g_object_get_data(G_OBJECT(tbl), "offspn"));
    GtkWidget *offslide =GTK_WIDGET(g_object_get_data(G_OBJECT(tbl), "offslide"));

    GtkAdjustment *adj = static_cast<GtkAdjustment*>(gtk_object_get_data(GTK_OBJECT(tbl), "offset"));

    bool isEndStop = false;

    SPStop *prev = NULL;
    prev = stop->getPrevStop();
    if (prev != NULL )  {
        adj->lower = prev->offset;
    } else {
        isEndStop = true;
        adj->lower = 0;
    }

    SPStop *next = NULL;
    next = stop->getNextStop();
    if (next != NULL ) {
        adj->upper = next->offset;
    } else {
        isEndStop = true;
        adj->upper = 1.0;
    }

    //fixme: does this work on all possible input gradients?
    if (!isEndStop) {
        gtk_widget_set_sensitive(offslide, TRUE);
        gtk_widget_set_sensitive(GTK_WIDGET(offspin), TRUE);
    } else {
        gtk_widget_set_sensitive(offslide, FALSE);
        gtk_widget_set_sensitive(GTK_WIDGET(offspin), FALSE);
    }

    gtk_adjustment_set_value(adj, stop->offset);

    gtk_adjustment_changed(adj);

    blocked = FALSE;
}




static void offadjustmentChanged( GtkAdjustment *adjustment, GtkWidget *vb)
{
    if (blocked) {
        return;
    }

    blocked = TRUE;

    GtkOptionMenu *mnu = static_cast<GtkOptionMenu *>(g_object_get_data(G_OBJECT(vb), "stopmenu"));
    if (!g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "stop")) {
        return;
    }
    SPStop *stop = SP_STOP(g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "stop"));

    stop->offset = adjustment->value;
    sp_repr_set_css_double(SP_OBJECT_REPR(stop), "offset", stop->offset);

    sp_document_done(SP_OBJECT_DOCUMENT(stop), SP_VERB_CONTEXT_GRADIENT,
                      _("Change gradient stop offset"));

    blocked = FALSE;
}

guint32 sp_average_color(guint32 c1, guint32 c2, gdouble p = 0.5)
{
    guint32 r = (guint32) (SP_RGBA32_R_U(c1) * p + SP_RGBA32_R_U(c2) * (1 - p));
    guint32 g = (guint32) (SP_RGBA32_G_U(c1) * p + SP_RGBA32_G_U(c2) * (1 - p));
    guint32 b = (guint32) (SP_RGBA32_B_U(c1) * p + SP_RGBA32_B_U(c2) * (1 - p));
    guint32 a = (guint32) (SP_RGBA32_A_U(c1) * p + SP_RGBA32_A_U(c2) * (1 - p));

    return SP_RGBA32_U_COMPOSE(r, g, b, a);
}


static void sp_grd_ed_add_stop(GtkWidget */*widget*/,  GtkWidget *vb)
{
    SPGradient *gradient = static_cast<SPGradient *>(g_object_get_data(G_OBJECT(vb), "gradient"));
    verify_grad(gradient);
    GtkOptionMenu *mnu = static_cast<GtkOptionMenu *>(g_object_get_data(G_OBJECT(vb), "stopmenu"));

    SPStop *stop = static_cast<SPStop *>(g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "stop"));

    if (stop == NULL) {
        return;
    }

    Inkscape::XML::Node *new_stop_repr = NULL;

    SPStop *next = stop->getNextStop();

    if (next == NULL) {
        SPStop *prev = stop->getPrevStop();
        if (prev != NULL) {
            next = stop;
            stop = prev;
        }
    }

    if (next != NULL) {
        new_stop_repr = SP_OBJECT_REPR(stop)->duplicate(SP_OBJECT_REPR(gradient)->document());
        SP_OBJECT_REPR(gradient)->addChild(new_stop_repr, SP_OBJECT_REPR(stop));
    } else {
        next = stop;
        new_stop_repr = SP_OBJECT_REPR(stop->getPrevStop())->duplicate(SP_OBJECT_REPR(gradient)->document());
        SP_OBJECT_REPR(gradient)->addChild(new_stop_repr, SP_OBJECT_REPR(stop->getPrevStop()));
    }

    SPStop *newstop = (SPStop *) SP_OBJECT_DOCUMENT(gradient)->getObjectByRepr(new_stop_repr);

    newstop->offset = (stop->offset + next->offset) * 0.5 ;

    guint32 const c1 = sp_stop_get_rgba32(stop);
    guint32 const c2 = sp_stop_get_rgba32(next);
    guint32 cnew = sp_average_color(c1, c2);

    Inkscape::CSSOStringStream os;
    gchar c[64];
    sp_svg_write_color(c, sizeof(c), cnew);
    gdouble opacity = static_cast<gdouble>(SP_RGBA32_A_F(cnew));
    os << "stop-color:" << c << ";stop-opacity:" << opacity <<";";
    SP_OBJECT_REPR (newstop)->setAttribute("style", os.str().c_str());
    sp_repr_set_css_double( SP_OBJECT_REPR(newstop), "offset", (double)newstop->offset);

    sp_gradient_vector_widget_load_gradient(vb, gradient);
    Inkscape::GC::release(new_stop_repr);
    update_stop_list(GTK_WIDGET(mnu), gradient, newstop);
    GtkWidget *offspin = GTK_WIDGET(g_object_get_data(G_OBJECT(vb), "offspn"));
    GtkWidget *offslide =GTK_WIDGET(g_object_get_data(G_OBJECT(vb), "offslide"));
    gtk_widget_set_sensitive(offslide, TRUE);
    gtk_widget_set_sensitive(GTK_WIDGET(offspin), TRUE);
    sp_document_done(SP_OBJECT_DOCUMENT(gradient), SP_VERB_CONTEXT_GRADIENT,
                      _("Add gradient stop"));
}

static void sp_grd_ed_del_stop(GtkWidget */*widget*/,  GtkWidget *vb)
{
    SPGradient *gradient = static_cast<SPGradient *>(g_object_get_data(G_OBJECT(vb), "gradient"));

    GtkOptionMenu *mnu = static_cast<GtkOptionMenu *>(g_object_get_data(G_OBJECT(vb), "stopmenu"));
    if (!g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "stop")) return;
    SPStop *stop = SP_STOP(g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "stop"));
    if (gradient->vector.stops.size() > 2) { // 2 is the minimum

        // if we delete first or last stop, move the next/previous to the edge
        if (stop->offset == 0) {
            SPStop *next = stop->getNextStop();
            if (next) {
                next->offset = 0;
                sp_repr_set_css_double(SP_OBJECT_REPR(next), "offset", 0);
            }
        } else if (stop->offset == 1) {
            SPStop *prev = stop->getPrevStop();
            if (prev) {
                prev->offset = 1;
                sp_repr_set_css_double(SP_OBJECT_REPR(prev), "offset", 1);
            }
        }

        SP_OBJECT_REPR(gradient)->removeChild(SP_OBJECT_REPR(stop));
        sp_gradient_vector_widget_load_gradient(vb, gradient);
        update_stop_list(GTK_WIDGET(mnu), gradient, NULL);
        sp_document_done(SP_OBJECT_DOCUMENT(gradient), SP_VERB_CONTEXT_GRADIENT,
                          _("Delete gradient stop"));
    }

}

static GtkWidget * sp_gradient_vector_widget_new(SPGradient *gradient, SPStop *select_stop)
{
    GtkWidget *vb, *w, *f, *csel;

    g_return_val_if_fail(!gradient || SP_IS_GRADIENT(gradient), NULL);

    vb = gtk_vbox_new(FALSE, PAD);
    g_signal_connect(G_OBJECT(vb), "destroy", G_CALLBACK(sp_gradient_vector_widget_destroy), NULL);

    w = sp_gradient_image_new(gradient);
    g_object_set_data(G_OBJECT(vb), "preview", w);
    gtk_widget_show(w);
    gtk_box_pack_start(GTK_BOX(vb), w, TRUE, TRUE, PAD);

    sp_repr_add_listener(SP_OBJECT_REPR(gradient), &grad_edit_dia_repr_events, vb);
    GtkTooltips *tt = gtk_tooltips_new();

    /* Stop list */
    GtkWidget *mnu = gtk_option_menu_new();
    /* Create new menu widget */
    update_stop_list(GTK_WIDGET(mnu), gradient, NULL);
    gtk_signal_connect(GTK_OBJECT(mnu), "changed", GTK_SIGNAL_FUNC(sp_grad_edit_select), vb);
    gtk_widget_show(mnu);
    gtk_object_set_data(GTK_OBJECT(vb), "stopmenu", mnu);
    gtk_box_pack_start(GTK_BOX(vb), mnu, FALSE, FALSE, 0);

    /* Add and Remove buttons */
    GtkWidget *hb = gtk_hbox_new(FALSE, 1);
    // TRANSLATORS: "Stop" means: a "phase" of a gradient
    GtkWidget *b = gtk_button_new_with_label(_("Add stop"));
    gtk_widget_show(b);
    gtk_container_add(GTK_CONTAINER(hb), b);
    gtk_tooltips_set_tip(tt, b, _("Add another control stop to gradient"), NULL);
    gtk_signal_connect(GTK_OBJECT(b), "clicked", GTK_SIGNAL_FUNC(sp_grd_ed_add_stop), vb);
    b = gtk_button_new_with_label(_("Delete stop"));
    gtk_widget_show(b);
    gtk_container_add(GTK_CONTAINER(hb), b);
    gtk_tooltips_set_tip(tt, b, _("Delete current control stop from gradient"), NULL);
    gtk_signal_connect(GTK_OBJECT(b), "clicked", GTK_SIGNAL_FUNC(sp_grd_ed_del_stop), vb);

    gtk_widget_show(hb);
    gtk_box_pack_start(GTK_BOX(vb),hb, FALSE, FALSE, AUX_BETWEEN_BUTTON_GROUPS);


    /*  Offset Slider and stuff   */
    hb = gtk_hbox_new(FALSE, 0);

    /* Label */
    GtkWidget *l = gtk_label_new(_("Offset:"));
    gtk_misc_set_alignment(GTK_MISC(l), 1.0, 0.5);
    gtk_box_pack_start(GTK_BOX(hb),l, FALSE, FALSE, AUX_BETWEEN_BUTTON_GROUPS);
    gtk_widget_show(l);

    /* Adjustment */
    GtkAdjustment *Offset_adj = NULL;
    Offset_adj= (GtkAdjustment *) gtk_adjustment_new(0.0, 0.0, 1.0, 0.01, 0.01, 0.0);
    gtk_object_set_data(GTK_OBJECT(vb), "offset", Offset_adj);
    GtkMenu *m = GTK_MENU(gtk_option_menu_get_menu(GTK_OPTION_MENU(mnu)));
    SPStop *stop = SP_STOP(g_object_get_data(G_OBJECT(gtk_menu_get_active(m)), "stop"));
    gtk_adjustment_set_value(Offset_adj, stop->offset);

    /* Slider */
    GtkWidget *slider = gtk_hscale_new(Offset_adj);
    gtk_scale_set_draw_value( GTK_SCALE(slider), FALSE );
    gtk_widget_show(slider);
    gtk_box_pack_start(GTK_BOX(hb),slider, TRUE, TRUE, AUX_BETWEEN_BUTTON_GROUPS);
    gtk_object_set_data(GTK_OBJECT(vb), "offslide", slider);

    /* Spinbutton */
    GtkWidget *sbtn = gtk_spin_button_new(GTK_ADJUSTMENT(Offset_adj), 0.01, 2);
    sp_dialog_defocus_on_enter(sbtn);
    gtk_widget_show(sbtn);
    gtk_box_pack_start(GTK_BOX(hb),sbtn, FALSE, TRUE, AUX_BETWEEN_BUTTON_GROUPS);
    gtk_object_set_data(GTK_OBJECT(vb), "offspn", sbtn);

    if (stop->offset>0 && stop->offset<1) {
        gtk_widget_set_sensitive(slider, TRUE);
        gtk_widget_set_sensitive(GTK_WIDGET(sbtn), TRUE);
    } else {
        gtk_widget_set_sensitive(slider, FALSE);
        gtk_widget_set_sensitive(GTK_WIDGET(sbtn), FALSE);
    }


    /* Signals */
    gtk_signal_connect(GTK_OBJECT(Offset_adj), "value_changed",
                        GTK_SIGNAL_FUNC(offadjustmentChanged), vb);

    // gtk_signal_connect(GTK_OBJECT(slider), "changed",  GTK_SIGNAL_FUNC(offsliderChanged), vb);
    gtk_widget_show(hb);
    gtk_box_pack_start(GTK_BOX(vb), hb, FALSE, FALSE, PAD);

    // TRANSLATORS: "Stop" means: a "phase" of a gradient
    f = gtk_frame_new(_("Stop Color"));
    gtk_widget_show(f);
    gtk_box_pack_start(GTK_BOX(vb), f, TRUE, TRUE, PAD);
    csel = static_cast<GtkWidget*>(sp_color_selector_new(SP_TYPE_COLOR_NOTEBOOK));
    g_object_set_data(G_OBJECT(vb), "cselector", csel);
    gtk_widget_show(csel);
    gtk_container_add(GTK_CONTAINER(f), csel);
    g_signal_connect(G_OBJECT(csel), "dragged", G_CALLBACK(sp_gradient_vector_color_dragged), vb);
    g_signal_connect(G_OBJECT(csel), "changed", G_CALLBACK(sp_gradient_vector_color_changed), vb);

    gtk_widget_show(vb);

    sp_gradient_vector_widget_load_gradient(vb, gradient);

    if (select_stop) {
        select_stop_in_list(GTK_WIDGET(mnu), gradient, select_stop);
    }

    return vb;
}



GtkWidget * sp_gradient_vector_editor_new(SPGradient *gradient, SPStop *stop)
{
    GtkWidget *wid;

    if (dlg == NULL) {
        Inkscape::Preferences *prefs = Inkscape::Preferences::get();

        dlg = sp_window_new(_("Gradient editor"), TRUE);
        if (x == -1000 || y == -1000) {
            x = prefs->getInt(prefs_path + "x", -1000);
            y = prefs->getInt(prefs_path + "y", -1000);
        }
        if (w ==0 || h == 0) {
            w = prefs->getInt(prefs_path + "w", 0);
            h = prefs->getInt(prefs_path + "h", 0);
        }

        if (x<0) {
            x=0;
        }
        if (y<0) {
            y=0;
        }

        if (x != 0 || y != 0) {
            gtk_window_move(reinterpret_cast<GtkWindow *>(dlg), x, y);
        } else {
            gtk_window_set_position(GTK_WINDOW(dlg), GTK_WIN_POS_CENTER);
        }
        if (w && h) {
            gtk_window_resize(reinterpret_cast<GtkWindow *>(dlg), w, h);
        }
        sp_transientize(dlg);
        wd.win = dlg;
        wd.stop = 0;
        g_signal_connect(G_OBJECT(INKSCAPE), "activate_desktop", G_CALLBACK(sp_transientize_callback), &wd);
        gtk_signal_connect(GTK_OBJECT(dlg), "event", GTK_SIGNAL_FUNC(sp_dialog_event_handler), dlg);
        gtk_signal_connect(GTK_OBJECT(dlg), "destroy", G_CALLBACK(sp_gradient_vector_dialog_destroy), dlg);
        gtk_signal_connect(GTK_OBJECT(dlg), "delete_event", G_CALLBACK(sp_gradient_vector_dialog_delete), dlg);
        g_signal_connect(G_OBJECT(INKSCAPE), "shut_down", G_CALLBACK(sp_gradient_vector_dialog_delete), dlg);
        g_signal_connect( G_OBJECT(INKSCAPE), "dialogs_hide", G_CALLBACK(sp_dialog_hide), dlg );
        g_signal_connect( G_OBJECT(INKSCAPE), "dialogs_unhide", G_CALLBACK(sp_dialog_unhide), dlg );

        gtk_container_set_border_width(GTK_CONTAINER(dlg), PAD);

        wid = static_cast<GtkWidget*>(sp_gradient_vector_widget_new(gradient, stop));
        g_object_set_data(G_OBJECT(dlg), "gradient-vector-widget", wid);
        /* Connect signals */
        gtk_widget_show(wid);
        gtk_container_add(GTK_CONTAINER(dlg), wid);
    } else {
        // FIXME: temp fix for 0.38
        // Simply load_gradient into the editor does not work for multi-stop gradients,
        // as the stop list and other widgets are in a wrong state and crash readily.
        // Instead we just delete the window (by sending the delete signal)
        // and call sp_gradient_vector_editor_new again, so it creates the window anew.

        GdkEventAny event;
        GtkWidget *widget = static_cast<GtkWidget *>(dlg);
        event.type = GDK_DELETE;
        event.window = widget->window;
        event.send_event = TRUE;
        g_object_ref(G_OBJECT(event.window));
        gtk_main_do_event(reinterpret_cast<GdkEvent*>(&event));
        g_object_unref(G_OBJECT(event.window));

        g_assert(dlg == NULL);
        sp_gradient_vector_editor_new(gradient, stop);
    }

    return dlg;
}

static void sp_gradient_vector_widget_load_gradient(GtkWidget *widget, SPGradient *gradient)
{
    blocked = TRUE;

    SPGradient *old;

    old = (SPGradient*)g_object_get_data(G_OBJECT(widget), "gradient");

    if (old != gradient) {
        sigc::connection *release_connection;
        sigc::connection *modified_connection;

        release_connection = (sigc::connection *)g_object_get_data(G_OBJECT(widget), "gradient_release_connection");
        modified_connection = (sigc::connection *)g_object_get_data(G_OBJECT(widget), "gradient_modified_connection");

        if (old) {
            g_assert( release_connection != NULL );
            g_assert( modified_connection != NULL );
            release_connection->disconnect();
            modified_connection->disconnect();
            sp_signal_disconnect_by_data(old, widget);
        }

        if (gradient) {
            if (!release_connection) {
                release_connection = new sigc::connection();
            }
            if (!modified_connection) {
                modified_connection = new sigc::connection();
            }
            *release_connection = gradient->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_gradient_vector_gradient_release), widget));
            *modified_connection = gradient->connectModified(sigc::bind<2>(sigc::ptr_fun(&sp_gradient_vector_gradient_modified), widget));
        } else {
            if (release_connection) {
                delete release_connection;
                release_connection = NULL;
            }
            if (modified_connection) {
                delete modified_connection;
                modified_connection = NULL;
            }
        }

        g_object_set_data(G_OBJECT(widget), "gradient_release_connection", release_connection);
        g_object_set_data(G_OBJECT(widget), "gradient_modified_connection", modified_connection);
    }

    g_object_set_data(G_OBJECT(widget), "gradient", gradient);

    if (gradient) {
        gtk_widget_set_sensitive(widget, TRUE);

        gradient->ensureVector();

        GtkOptionMenu *mnu = static_cast<GtkOptionMenu *>(g_object_get_data(G_OBJECT(widget), "stopmenu"));
        SPStop *stop = SP_STOP(g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "stop"));

        // get the color selector
        SPColorSelector *csel = SP_COLOR_SELECTOR(g_object_get_data(G_OBJECT(widget), "cselector"));

        csel->base->setColorAlpha( stop->getEffectiveColor(), stop->opacity );

        /* Fill preview */
        GtkWidget *w = static_cast<GtkWidget *>(g_object_get_data(G_OBJECT(widget), "preview"));
        sp_gradient_image_set_gradient(SP_GRADIENT_IMAGE(w), gradient);

        update_stop_list(GTK_WIDGET(mnu), gradient, NULL);

        // Once the user edits a gradient, it stops being auto-collectable
        if (SP_OBJECT_REPR(gradient)->attribute("inkscape:collect")) {
            SPDocument *document = SP_OBJECT_DOCUMENT(gradient);
            bool saved = sp_document_get_undo_sensitive(document);
            sp_document_set_undo_sensitive(document, false);
            SP_OBJECT_REPR(gradient)->setAttribute("inkscape:collect", NULL);
            sp_document_set_undo_sensitive(document, saved);
        }
    } else { // no gradient, disable everything
        gtk_widget_set_sensitive(widget, FALSE);
    }

    blocked = FALSE;
}

static void sp_gradient_vector_dialog_destroy(GtkObject */*object*/, gpointer /*data*/)
{
    sp_signal_disconnect_by_data(INKSCAPE, dlg);
    wd.win = dlg = NULL;
    wd.stop = 0;
}

static gboolean sp_gradient_vector_dialog_delete(GtkWidget */*widget*/, GdkEvent */*event*/, GtkWidget */*dialog*/)
{
    gtk_window_get_position(GTK_WINDOW(dlg), &x, &y);
    gtk_window_get_size(GTK_WINDOW(dlg), &w, &h);

    if (x<0) {
        x=0;
    }
    if (y<0) {
        y=0;
    }

    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    prefs->setInt(prefs_path + "x", x);
    prefs->setInt(prefs_path + "y", y);
    prefs->setInt(prefs_path + "w", w);
    prefs->setInt(prefs_path + "h", h);

    return FALSE; // which means, go ahead and destroy it
}

/* Widget destroy handler */

static void sp_gradient_vector_widget_destroy(GtkObject *object, gpointer /*data*/)
{
    GObject *gradient;

    gradient = (GObject*)g_object_get_data(G_OBJECT(object), "gradient");

    sigc::connection *release_connection = (sigc::connection *)g_object_get_data(G_OBJECT(object), "gradient_release_connection");
    sigc::connection *modified_connection = (sigc::connection *)g_object_get_data(G_OBJECT(object), "gradient_modified_connection");

    if (gradient) {
        g_assert( release_connection != NULL );
        g_assert( modified_connection != NULL );
        release_connection->disconnect();
        modified_connection->disconnect();
        sp_signal_disconnect_by_data(gradient, object);
    }

    if (gradient && SP_OBJECT_REPR(gradient)) {
        sp_repr_remove_listener_by_data(SP_OBJECT_REPR(gradient), object);
    }
}

static void sp_gradient_vector_gradient_release(SPObject */*object*/, GtkWidget *widget)
{
    sp_gradient_vector_widget_load_gradient(widget, NULL);
}

static void sp_gradient_vector_gradient_modified(SPObject *object, guint /*flags*/, GtkWidget *widget)
{
    SPGradient *gradient=SP_GRADIENT(object);
    if (!blocked) {
        blocked = TRUE;
        sp_gradient_vector_widget_load_gradient(widget, gradient);
        blocked = FALSE;
    }
}

static void sp_gradient_vector_color_dragged(SPColorSelector *csel, GtkObject *object)
{
    SPGradient *gradient, *ngr;

    if (blocked) {
        return;
    }

    gradient = static_cast<SPGradient*>(g_object_get_data(G_OBJECT(object), "gradient"));
    if (!gradient) {
        return;
    }

    blocked = TRUE;

    ngr = sp_gradient_ensure_vector_normalized(gradient);
    if (ngr != gradient) {
        /* Our master gradient has changed */
        sp_gradient_vector_widget_load_gradient(GTK_WIDGET(object), ngr);
    }

    ngr->ensureVector();

    GtkOptionMenu *mnu = static_cast<GtkOptionMenu *>(g_object_get_data(G_OBJECT(object), "stopmenu"));
    SPStop *stop = SP_STOP(g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "stop"));


    csel->base->getColorAlpha(stop->specified_color, stop->opacity);
    stop->currentColor = false;

    blocked = FALSE;
}

static void sp_gradient_vector_color_changed(SPColorSelector *csel, GtkObject *object)
{
    if (blocked) {
        return;
    }

    SPGradient *gradient = static_cast<SPGradient*>(g_object_get_data(G_OBJECT(object), "gradient"));
    if (!gradient) {
        return;
    }

    blocked = TRUE;

    SPGradient *ngr = sp_gradient_ensure_vector_normalized(gradient);
    if (ngr != gradient) {
        /* Our master gradient has changed */
        sp_gradient_vector_widget_load_gradient(GTK_WIDGET(object), ngr);
    }

    ngr->ensureVector();

    /* Set start parameters */
    /* We rely on normalized vector, i.e. stops HAVE to exist */
    g_return_if_fail(ngr->getFirstStop() != NULL);

    GtkOptionMenu *mnu = static_cast<GtkOptionMenu *>(g_object_get_data(G_OBJECT(object), "stopmenu"));
    SPStop *stop = SP_STOP(g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "stop"));

    csel = static_cast<SPColorSelector*>(g_object_get_data(G_OBJECT(object), "cselector"));
    SPColor color;
    float alpha = 0;
    csel->base->getColorAlpha( color, alpha );

    sp_repr_set_css_double(SP_OBJECT_REPR(stop), "offset", stop->offset);
    Inkscape::CSSOStringStream os;
    os << "stop-color:" << color.toString() << ";stop-opacity:" << static_cast<gdouble>(alpha) <<";";
    SP_OBJECT_REPR(stop)->setAttribute("style", os.str().c_str());
    // g_snprintf(c, 256, "stop-color:#%06x;stop-opacity:%g;", rgb >> 8, static_cast<gdouble>(alpha));
    //SP_OBJECT_REPR(stop)->setAttribute("style", c);

    sp_document_done(SP_OBJECT_DOCUMENT(ngr), SP_VERB_CONTEXT_GRADIENT,
                      _("Change gradient stop color"));

    blocked = FALSE;

    SPColorPreview *cpv = static_cast<SPColorPreview *>(g_object_get_data(G_OBJECT(gtk_menu_get_active(GTK_MENU(gtk_option_menu_get_menu(mnu)))), "preview"));
    sp_color_preview_set_rgba32(cpv, sp_stop_get_rgba32(stop));
}

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :

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