C++ SPObject类代码示例

void
sp_conn_end_href_changed(SPObject */*old_ref*/, SPObject */*ref*/,
                         SPConnEnd *connEndPtr, SPPath *const path, unsigned const handle_ix)
{
    g_return_if_fail(connEndPtr != NULL);
    SPConnEnd &connEnd = *connEndPtr;
    connEnd._delete_connection.disconnect();
    connEnd._transformed_connection.disconnect();
    connEnd._group_connection.disconnect();

    if (connEnd.href) {
        SPObject *refobj = connEnd.ref.getObject();
        if (refobj) {
            connEnd._delete_connection
                = refobj->connectDelete(sigc::bind(sigc::ptr_fun(&sp_conn_end_deleted),
                                                   path, handle_ix));
            // This allows the connector tool to dive into a group's children
            // And connect to their children's centers.
            SPObject *parent = refobj->parent;
            if (SP_IS_GROUP(parent) && ! SP_IS_LAYER(parent)) {
                connEnd._group_connection
                    = SP_ITEM(parent)->connectTransformed(sigc::bind(sigc::ptr_fun(&sp_conn_end_shape_move),
                                                                 path));
            }
            connEnd._transformed_connection
                = SP_ITEM(refobj)->connectTransformed(sigc::bind(sigc::ptr_fun(&sp_conn_end_shape_move),
                                                                 path));
        }
    }
}

/**
 * Fills in the data for an SPObject from its Inkscape::XML::Node object.
 * It fills in data such as version, x, y, width, height, etc.
 * It then calls the object's parent class object's build function.
 */
static void sp_root_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
{
    SPGroup *group = (SPGroup *) object;
    SPRoot *root = (SPRoot *) object;

    //XML Tree being used directly here while it shouldn't be.
    if ( !object->getRepr()->attribute("version") ) {
        repr->setAttribute("version", SVG_VERSION);
    }

    object->readAttr( "version" );
    object->readAttr( "inkscape:version" );
    /* It is important to parse these here, so objects will have viewport build-time */
    object->readAttr( "x" );
    object->readAttr( "y" );
    object->readAttr( "width" );
    object->readAttr( "height" );
    object->readAttr( "viewBox" );
    object->readAttr( "preserveAspectRatio" );
    object->readAttr( "onload" );

    if (((SPObjectClass *) parent_class)->build)
        (* ((SPObjectClass *) parent_class)->build) (object, document, repr);

    // Search for first <defs> node
    for (SPObject *o = group->firstChild() ; o ; o = o->getNext() ) {
        if (SP_IS_DEFS(o)) {
            root->defs = SP_DEFS(o);
            break;
        }
    }

    // clear transform, if any was read in - SVG does not allow transform= on <svg>
    SP_ITEM(object)->transform = Geom::identity();
}

static void
sp_clippath_modified(SPObject *object, guint flags)
{
    if (flags & SP_OBJECT_MODIFIED_FLAG) {
        flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
    }

    flags &= SP_OBJECT_MODIFIED_CASCADE;

    SPObjectGroup *og = SP_OBJECTGROUP(object);
    GSList *l = NULL;
    for (SPObject *child = sp_object_first_child(SP_OBJECT(og)); child != NULL; child = SP_OBJECT_NEXT(child)) {
        g_object_ref(G_OBJECT(child));
        l = g_slist_prepend(l, child);
    }
    l = g_slist_reverse(l);
    while (l) {
        SPObject *child = SP_OBJECT(l->data);
        l = g_slist_remove(l, child);
        if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
            child->emitModified(flags);
        }
        g_object_unref(G_OBJECT(child));
    }
}

/**
 * Virtual build: set gradient attributes from its associated repr.
 */
void SPGradient::build(SPDocument *document, Inkscape::XML::Node *repr)
{
    // Work-around in case a swatch had been marked for immediate collection:
    if ( repr->attribute("osb:paint") && repr->attribute("inkscape:collect") ) {
        repr->setAttribute("inkscape:collect", 0);
    }

    SPPaintServer::build(document, repr);

    for ( SPObject *ochild = this->firstChild() ; ochild ; ochild = ochild->getNext() ) {
        if (SP_IS_STOP(ochild)) {
            this->has_stops = TRUE;
            break;
        }
    }

    this->readAttr( "gradientUnits" );
    this->readAttr( "gradientTransform" );
    this->readAttr( "spreadMethod" );
    this->readAttr( "xlink:href" );
    this->readAttr( "osb:paint" );

    // Register ourselves
    document->addResource("gradient", this);
}

static void sp_gradient_vector_widget_destroy(GtkObject *object, gpointer /*data*/)
#endif
{
    SPObject *gradient = SP_OBJECT(g_object_get_data(G_OBJECT(object), "gradient"));

    sigc::connection *release_connection = static_cast<sigc::connection *>(g_object_get_data(G_OBJECT(object), "gradient_release_connection"));
    sigc::connection *modified_connection = static_cast<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->getRepr()) {
            sp_repr_remove_listener_by_data(gradient->getRepr(), object);
        }
    }

    SelectedColor *selected_color = static_cast<SelectedColor *>(g_object_get_data(G_OBJECT(object), "cselector"));
    if (selected_color) {
        delete selected_color;
        g_object_set_data(G_OBJECT(object), "cselector", NULL);
    }
}

/**
 * Callback for remove_child event.
 */
void SPGradient::remove_child(Inkscape::XML::Node *child)
{
    this->invalidateVector();

    SPPaintServer::remove_child(child);

    this->has_stops = FALSE;
    for ( SPObject *ochild = this->firstChild() ; ochild ; ochild = ochild->getNext() ) {
        if (SP_IS_STOP(ochild)) {
            this->has_stops = TRUE;
            break;
        }
    }

    if ( this->getStopCount() == 0 ) {
        gchar const * attr = this->getAttribute("osb:paint");

        if ( attr && strcmp(attr, "solid") ) {
            this->setAttribute( "osb:paint", "solid", 0 );
        }
    }

    /* Fixme: should we schedule "modified" here? */
    this->requestModified(SP_OBJECT_MODIFIED_FLAG);
}

Inkscape::DrawingItem *SPClipPath::show(Inkscape::Drawing &drawing, unsigned int key) {
    Inkscape::DrawingGroup *ai = new Inkscape::DrawingGroup(drawing);
    display = sp_clippath_view_new_prepend(display, key, ai);

    for ( SPObject *child = firstChild() ; child ; child = child->getNext() ) {
        if (SP_IS_ITEM(child)) {
            Inkscape::DrawingItem *ac = SP_ITEM(child)->invoke_show(drawing, key, SP_ITEM_REFERENCE_FLAGS);

            if (ac) {
                /* The order is not important in clippath */
                ai->appendChild(ac);
            }
        }
    }

    if (clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX && display->bbox) {
        Geom::Affine t = Geom::Scale(display->bbox->dimensions());
        t.setTranslation(display->bbox->min());
        ai->setChildTransform(t);
    }

    ai->setStyle(this->style);

    return ai;
}

/* For the sigc::connection changes (i.e. when the object being refered to changes) */
static void
sp_tref_href_changed(SPObject */*old_ref*/, SPObject */*ref*/, SPTRef *tref)
{
    if (tref)
    {
        // Save a pointer to the original object being referred to
        SPObject *refRoot = tref->getObjectReferredTo();

        tref->_delete_connection.disconnect();

        if (tref->stringChild) {
            tref->detach(tref->stringChild);
            tref->stringChild = NULL;
        }

        // Ensure that we are referring to a legitimate object
        if (tref->href && refRoot && sp_tref_reference_allowed(tref, refRoot)) {

            // Update the text being referred to (will create a new string child)
            sp_tref_update_text(tref);

            // Restore the delete connection now that we're done messing with stuff
            tref->_delete_connection = refRoot->connectDelete(sigc::bind(sigc::ptr_fun(&sp_tref_delete_self), tref));
        }

    }
}

Shape* SPFlowtext::_buildExclusionShape() const
{
    Shape *shape = new Shape();
    Shape *shape_temp = new Shape();

    for (SPObject *child = children ; child ; child = child->getNext() ) {
        // RH: is it right that this shouldn't be recursive?
        if ( SP_IS_FLOWREGIONEXCLUDE(child) ) {
            SPFlowregionExclude *c_child = SP_FLOWREGIONEXCLUDE(child);

            if ( c_child->computed && c_child->computed->hasEdges() ) {
                if (shape->hasEdges()) {
                    shape_temp->Booleen(shape, c_child->computed, bool_op_union);
                    std::swap(shape, shape_temp);
                } else {
                    shape->Copy(c_child->computed);
                }
            }
        }
    }

    delete shape_temp;

    return shape;
}

static SPObject * sp_marker_load_from_svg(gchar const *name, SPDocument *current_doc)
{
    static SPDocument *doc = NULL;
    static unsigned int edoc = FALSE;
    if (!current_doc) {
        return NULL;
    }
    /* Try to load from document */
    if (!edoc && !doc) {
        gchar *markers = g_build_filename(INKSCAPE_MARKERSDIR, "/markers.svg", NULL);
        if (Inkscape::IO::file_test(markers, G_FILE_TEST_IS_REGULAR)) {
            doc = SPDocument::createNewDoc(markers, FALSE);
        }
        g_free(markers);
        if (doc) {
            doc->ensureUpToDate();
        } else {
            edoc = TRUE;
        }
    }
    if (!edoc && doc) {
        /* Get the marker we want */
        SPObject *object = doc->getObjectById(name);
        if (object && SP_IS_MARKER(object)) {
            SPDefs *defs = current_doc->getDefs();
            Inkscape::XML::Document *xml_doc = current_doc->getReprDoc();
            Inkscape::XML::Node *mark_repr = object->getRepr()->duplicate(xml_doc);
            defs->getRepr()->addChild(mark_repr, NULL);
            SPObject *cloned_item = current_doc->getObjectByRepr(mark_repr);
            Inkscape::GC::release(mark_repr);
            return cloned_item;
        }
    }
    return NULL;
}

void SPFlowtext::modified(unsigned int flags) {
    SPObject *region = NULL;

    if (flags & SP_OBJECT_MODIFIED_FLAG) {
    	flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
    }

    flags &= SP_OBJECT_MODIFIED_CASCADE;

    // FIXME: the below stanza is copied over from sp_text_modified, consider factoring it out
    if (flags & ( SP_OBJECT_STYLE_MODIFIED_FLAG )) {
        SPFlowtext *text = SP_FLOWTEXT(this);
        Geom::OptRect pbox = text->geometricBounds();

        for (SPItemView* v = text->display; v != NULL; v = v->next) {
            Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(v->arenaitem);
            text->_clearFlow(g);
            g->setStyle(this->style);
            text->layout.show(g, pbox);
        }
    }

    for ( SPObject *o = this->firstChild() ; o ; o = o->getNext() ) {
        if (SP_IS_FLOWREGION(o)) {
            region = o;
            break;
        }
    }

    if (region) {
        if (flags || (region->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
            region->emitModified(flags); // pass down to the region only
        }
    }
}

static void
sp_group_perform_patheffect(SPGroup *group, SPGroup *topgroup, bool write)
{
    GSList const *item_list = sp_item_group_item_list(SP_GROUP(group));
    for ( GSList const *iter = item_list; iter; iter = iter->next ) {
        SPObject *subitem = static_cast<SPObject *>(iter->data);
        if (SP_IS_GROUP(subitem)) {
            sp_group_perform_patheffect(SP_GROUP(subitem), topgroup, write);
        } else if (SP_IS_SHAPE(subitem)) {
            SPCurve * c = NULL;
            if (SP_IS_PATH(subitem)) {
                c = SP_PATH(subitem)->get_original_curve();
            } else {
                c = SP_SHAPE(subitem)->getCurve();
            }
            // only run LPEs when the shape has a curve defined
            if (c) {
                sp_lpe_item_perform_path_effect(SP_LPE_ITEM(topgroup), c);
                SP_SHAPE(subitem)->setCurve(c, TRUE);

                if (write) {
                    Inkscape::XML::Node *repr = subitem->getRepr();
                    gchar *str = sp_svg_write_path(c->get_pathvector());
                    repr->setAttribute("d", str);
#ifdef GROUP_VERBOSE
g_message("sp_group_perform_patheffect writes 'd' attribute");
#endif
                    g_free(str);
                }

                c->unref();
            }
        }
    }
}

void SPClipPath::modified(unsigned int flags) {
    if (flags & SP_OBJECT_MODIFIED_FLAG) {
        flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
    }

    flags &= SP_OBJECT_MODIFIED_CASCADE;

    GSList *l = NULL;
    for (SPObject *child = this->firstChild(); child; child = child->getNext()) {
        sp_object_ref(child);
        l = g_slist_prepend(l, child);
    }

    l = g_slist_reverse(l);

    while (l) {
        SPObject *child = SP_OBJECT(l->data);
        l = g_slist_remove(l, child);

        if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
            child->emitModified(flags);
        }

        sp_object_unref(child);
    }
}

static Inkscape::XML::Node *
sp_textpath_write(SPObject *object, Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)
{
    SPTextPath *textpath = SP_TEXTPATH(object);

    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
        repr = xml_doc->createElement("svg:textPath");
    }
	
    textpath->attributes.writeTo(repr);
    if (textpath->startOffset._set) {
        if (textpath->startOffset.unit == SVGLength::PERCENT) {
	        Inkscape::SVGOStringStream os;
            os << (textpath->startOffset.computed * 100.0) << "%";
            SP_OBJECT_REPR(textpath)->setAttribute("startOffset", os.str().c_str());
        } else {
            /* FIXME: This logic looks rather undesirable if e.g. startOffset is to be
               in ems. */
            sp_repr_set_svg_double(repr, "startOffset", textpath->startOffset.computed);
        }
    }

    if ( textpath->sourcePath->sourceHref ) repr->setAttribute("xlink:href", textpath->sourcePath->sourceHref);
	
    if ( flags&SP_OBJECT_WRITE_BUILD ) {
        GSList *l = NULL;
        for (SPObject* child = sp_object_first_child(object) ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
            Inkscape::XML::Node* c_repr=NULL;
            if ( SP_IS_TSPAN(child) || SP_IS_TREF(child) ) {
                c_repr = child->updateRepr(xml_doc, NULL, flags);
            } else if ( SP_IS_TEXTPATH(child) ) {
                //c_repr = child->updateRepr(xml_doc, NULL, flags); // shouldn't happen
            } else if ( SP_IS_STRING(child) ) {
                c_repr = xml_doc->createTextNode(SP_STRING(child)->string.c_str());
            }
            if ( c_repr ) l = g_slist_prepend(l, c_repr);
        }
        while ( l ) {
            repr->addChild((Inkscape::XML::Node *) l->data, NULL);
            Inkscape::GC::release((Inkscape::XML::Node *) l->data);
            l = g_slist_remove(l, l->data);
        }
    } else {
        for (SPObject* child = sp_object_first_child(object) ; child != NULL ; child = SP_OBJECT_NEXT(child) ) {
            if ( SP_IS_TSPAN(child) || SP_IS_TREF(child) ) {
                child->updateRepr(flags);
            } else if ( SP_IS_TEXTPATH(child) ) {
                //c_repr = child->updateRepr(xml_doc, NULL, flags); // shouldn't happen
            } else if ( SP_IS_STRING(child) ) {
                SP_OBJECT_REPR(child)->setContent(SP_STRING(child)->string.c_str());
            }
        }
    }
	
    if (((SPObjectClass *) textpath_parent_class)->write)
        ((SPObjectClass *) textpath_parent_class)->write(object, xml_doc, repr, flags);
	
    return repr;
}

void SPObject::release() {
    SPObject* object = this;

    debug("id=%p, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
    while (object->children) {
        object->detach(object->children);
    }
}