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-rw-r--r--src/object/sp-use.cpp767
1 files changed, 767 insertions, 0 deletions
diff --git a/src/object/sp-use.cpp b/src/object/sp-use.cpp
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+++ b/src/object/sp-use.cpp
@@ -0,0 +1,767 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SVG <use> implementation
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * bulia byak <buliabyak@users.sf.net>
+ * Jon A. Cruz <jon@joncruz.org>
+ * Abhishek Sharma
+ *
+ * Copyright (C) 1999-2005 authors
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstring>
+#include <string>
+
+#include <2geom/transforms.h>
+#include <glibmm/i18n.h>
+#include <glibmm/markup.h>
+
+#include "bad-uri-exception.h"
+#include "display/drawing-group.h"
+#include "attributes.h"
+#include "document.h"
+#include "sp-clippath.h"
+#include "sp-mask.h"
+#include "sp-factory.h"
+#include "sp-flowregion.h"
+#include "uri.h"
+#include "print.h"
+#include "xml/repr.h"
+#include "svg/svg.h"
+#include "preferences.h"
+#include "style.h"
+
+#include "sp-use.h"
+#include "sp-symbol.h"
+#include "sp-root.h"
+#include "sp-use-reference.h"
+#include "sp-shape.h"
+#include "sp-text.h"
+#include "sp-flowtext.h"
+
+SPUse::SPUse()
+ : SPItem(),
+ SPDimensions(),
+ child(nullptr),
+ href(nullptr),
+ ref(new SPUseReference(this)),
+ _delete_connection(),
+ _changed_connection(),
+ _transformed_connection()
+{
+ this->x.unset();
+ this->y.unset();
+ this->width.unset(SVGLength::PERCENT, 1.0, 1.0);
+ this->height.unset(SVGLength::PERCENT, 1.0, 1.0);
+
+ this->_changed_connection = this->ref->changedSignal().connect(
+ sigc::hide(sigc::hide(sigc::mem_fun(this, &SPUse::href_changed)))
+ );
+}
+
+SPUse::~SPUse() {
+ if (this->child) {
+ this->detach(this->child);
+ this->child = nullptr;
+ }
+
+ this->ref->detach();
+ delete this->ref;
+ this->ref = nullptr;
+}
+
+void SPUse::build(SPDocument *document, Inkscape::XML::Node *repr) {
+ SPItem::build(document, repr);
+
+ this->readAttr( "x" );
+ this->readAttr( "y" );
+ this->readAttr( "width" );
+ this->readAttr( "height" );
+ this->readAttr( "xlink:href" );
+
+ // We don't need to create child here:
+ // reading xlink:href will attach ref, and that will cause the changed signal to be emitted,
+ // which will call SPUse::href_changed, and that will take care of the child
+}
+
+void SPUse::release() {
+ if (this->child) {
+ this->detach(this->child);
+ this->child = nullptr;
+ }
+
+ this->_delete_connection.disconnect();
+ this->_changed_connection.disconnect();
+ this->_transformed_connection.disconnect();
+
+ g_free(this->href);
+ this->href = nullptr;
+
+ this->ref->detach();
+
+ SPItem::release();
+}
+
+void SPUse::set(SPAttributeEnum key, const gchar* value) {
+ switch (key) {
+ case SP_ATTR_X:
+ this->x.readOrUnset(value);
+ this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+ break;
+
+ case SP_ATTR_Y:
+ this->y.readOrUnset(value);
+ this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+ break;
+
+ case SP_ATTR_WIDTH:
+ this->width.readOrUnset(value, SVGLength::PERCENT, 1.0, 1.0);
+ this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+ break;
+
+ case SP_ATTR_HEIGHT:
+ this->height.readOrUnset(value, SVGLength::PERCENT, 1.0, 1.0);
+ this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+ break;
+
+ case SP_ATTR_XLINK_HREF: {
+ if ( value && this->href && ( strcmp(value, this->href) == 0 ) ) {
+ /* No change, do nothing. */
+ } else {
+ g_free(this->href);
+ this->href = nullptr;
+
+ if (value) {
+ // First, set the href field, because SPUse::href_changed will need it.
+ this->href = g_strdup(value);
+
+ // Now do the attaching, which emits the changed signal.
+ try {
+ this->ref->attach(Inkscape::URI(value));
+ } catch (Inkscape::BadURIException &e) {
+ g_warning("%s", e.what());
+ this->ref->detach();
+ }
+ } else {
+ this->ref->detach();
+ }
+ }
+ break;
+ }
+
+ default:
+ SPItem::set(key, value);
+ break;
+ }
+}
+
+Inkscape::XML::Node* SPUse::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags) {
+ if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
+ repr = xml_doc->createElement("svg:use");
+ }
+
+ SPItem::write(xml_doc, repr, flags);
+
+ sp_repr_set_svg_double(repr, "x", this->x.computed);
+ sp_repr_set_svg_double(repr, "y", this->y.computed);
+ repr->setAttribute("width", sp_svg_length_write_with_units(this->width));
+ repr->setAttribute("height", sp_svg_length_write_with_units(this->height));
+
+ if (this->ref->getURI()) {
+ auto uri_string = this->ref->getURI()->str();
+ repr->setAttributeOrRemoveIfEmpty("xlink:href", uri_string);
+ }
+
+ SPShape *shape = dynamic_cast<SPShape *>(child);
+ if (shape) {
+ shape->set_shape(); // evaluate SPCurve of child
+ } else {
+ SPText *text = dynamic_cast<SPText *>(child);
+ if (text) {
+ text->rebuildLayout(); // refresh Layout, LP Bug 1339305
+ } else {
+ SPFlowtext *flowtext = dynamic_cast<SPFlowtext *>(child);
+ if (flowtext) {
+ SPFlowregion *flowregion = dynamic_cast<SPFlowregion *>(flowtext->firstChild());
+ if (flowregion) {
+ flowregion->UpdateComputed();
+ }
+ flowtext->rebuildLayout();
+ }
+ }
+ }
+
+ return repr;
+}
+
+Geom::OptRect SPUse::bbox(Geom::Affine const &transform, SPItem::BBoxType bboxtype) const {
+ Geom::OptRect bbox;
+
+ if (this->child) {
+ Geom::Affine const ct(child->transform * Geom::Translate(this->x.computed, this->y.computed) * transform );
+
+ bbox = child->bounds(bboxtype, ct);
+ }
+
+ return bbox;
+}
+
+void SPUse::print(SPPrintContext* ctx) {
+ bool translated = false;
+
+ if ((this->x._set && this->x.computed != 0) || (this->y._set && this->y.computed != 0)) {
+ Geom::Affine tp(Geom::Translate(this->x.computed, this->y.computed));
+ ctx->bind(tp, 1.0);
+ translated = true;
+ }
+
+ if (this->child) {
+ this->child->invoke_print(ctx);
+ }
+
+ if (translated) {
+ ctx->release();
+ }
+}
+
+const char* SPUse::displayName() const {
+ if (dynamic_cast<SPSymbol *>(child)) {
+ return _("Symbol");
+ } else {
+ return _("Clone");
+ }
+}
+
+gchar* SPUse::description() const {
+ if (child) {
+ if ( dynamic_cast<SPSymbol *>(child) ) {
+ if (child->title()) {
+ return g_strdup_printf(_("called %s"), Glib::Markup::escape_text(Glib::ustring( g_dpgettext2(nullptr, "Symbol", child->title()))).c_str());
+ } else if (child->getAttribute("id")) {
+ return g_strdup_printf(_("called %s"), Glib::Markup::escape_text(Glib::ustring( g_dpgettext2(nullptr, "Symbol", child->getAttribute("id")))).c_str());
+ } else {
+ return g_strdup_printf(_("called %s"), _("Unnamed Symbol"));
+ }
+ }
+
+ static unsigned recursion_depth = 0;
+
+ if (recursion_depth >= 4) {
+ /* TRANSLATORS: Used for statusbar description for long <use> chains:
+ * "Clone of: Clone of: ... in Layer 1". */
+ return g_strdup(_("..."));
+ /* We could do better, e.g. chasing the href chain until we reach something other than
+ * a <use>, and giving its description. */
+ }
+
+ ++recursion_depth;
+ char *child_desc = this->child->detailedDescription();
+ --recursion_depth;
+
+ char *ret = g_strdup_printf(_("of: %s"), child_desc);
+ g_free(child_desc);
+
+ return ret;
+ } else {
+ return g_strdup(_("[orphaned]"));
+ }
+}
+
+Inkscape::DrawingItem* SPUse::show(Inkscape::Drawing &drawing, unsigned int key, unsigned int flags) {
+
+ // std::cout << "SPUse::show: " << (getId()?getId():"null") << std::endl;
+ Inkscape::DrawingGroup *ai = new Inkscape::DrawingGroup(drawing);
+ ai->setPickChildren(false);
+ this->context_style = this->style;
+ ai->setStyle(this->style, this->context_style);
+
+ if (this->child) {
+ Inkscape::DrawingItem *ac = this->child->invoke_show(drawing, key, flags);
+
+ if (ac) {
+ ai->prependChild(ac);
+ }
+
+ Geom::Translate t(this->x.computed, this->y.computed);
+ ai->setChildTransform(t);
+ }
+
+ return ai;
+}
+
+void SPUse::hide(unsigned int key) {
+ if (this->child) {
+ this->child->invoke_hide(key);
+ }
+
+// SPItem::onHide(key);
+}
+
+
+/**
+ * Returns the ultimate original of a SPUse (i.e. the first object in the chain of its originals
+ * which is not an SPUse). If no original is found, NULL is returned (it is the responsibility
+ * of the caller to make sure that this is handled correctly).
+ *
+ * Note that the returned is the clone object, i.e. the child of an SPUse (of the argument one for
+ * the trivial case) and not the "true original".
+ */
+SPItem *SPUse::root() {
+ SPItem *orig = this->child;
+
+ SPUse *use = dynamic_cast<SPUse *>(orig);
+ while (orig && use) {
+ orig = use->child;
+ use = dynamic_cast<SPUse *>(orig);
+ }
+
+ return orig;
+}
+
+SPItem const *SPUse::root() const {
+ return const_cast<SPUse*>(this)->root();
+}
+
+/**
+ * Get the number of dereferences or calls to get_original() needed to get an object
+ * which is not an svg:use. Returns -1 if there is no original object.
+ */
+int SPUse::cloneDepth() const {
+ unsigned depth = 1;
+ SPItem *orig = this->child;
+
+ while (orig && dynamic_cast<SPUse *>(orig)) {
+ ++depth;
+ orig = dynamic_cast<SPUse *>(orig)->child;
+ }
+
+ if (!orig) {
+ return -1;
+ } else {
+ return depth;
+ }
+}
+
+/**
+ * Returns the effective transform that goes from the ultimate original to given SPUse, both ends
+ * included.
+ */
+Geom::Affine SPUse::get_root_transform() {
+ //track the ultimate source of a chain of uses
+ SPObject *orig = this->child;
+
+ std::vector<SPItem*> chain;
+ chain.push_back(this);
+
+ while (dynamic_cast<SPUse *>(orig)) {
+ chain.push_back(dynamic_cast<SPItem *>(orig));
+ orig = dynamic_cast<SPUse *>(orig)->child;
+ }
+
+ chain.push_back(dynamic_cast<SPItem *>(orig));
+
+ // calculate the accumulated transform, starting from the original
+ Geom::Affine t(Geom::identity());
+
+ for (auto i=chain.rbegin(); i!=chain.rend(); ++i) {
+ SPItem *i_tem = *i;
+
+ // "An additional transformation translate(x,y) is appended to the end (i.e.,
+ // right-side) of the transform attribute on the generated 'g', where x and y
+ // represent the values of the x and y attributes on the 'use' element." - http://www.w3.org/TR/SVG11/struct.html#UseElement
+ SPUse *i_use = dynamic_cast<SPUse *>(i_tem);
+ if (i_use) {
+ if ((i_use->x._set && i_use->x.computed != 0) || (i_use->y._set && i_use->y.computed != 0)) {
+ t = t * Geom::Translate(i_use->x._set ? i_use->x.computed : 0, i_use->y._set ? i_use->y.computed : 0);
+ }
+ }
+
+ t *= i_tem->transform;
+ }
+ return t;
+}
+
+/**
+ * Returns the transform that leads to the use from its immediate original.
+ * Does not include the original's transform if any.
+ */
+Geom::Affine SPUse::get_parent_transform() {
+ Geom::Affine t(Geom::identity());
+
+ if ((this->x._set && this->x.computed != 0) || (this->y._set && this->y.computed != 0)) {
+ t *= Geom::Translate(this->x._set ? this->x.computed : 0, this->y._set ? this->y.computed : 0);
+ }
+
+ t *= this->transform;
+ return t;
+}
+
+/**
+ * Sensing a movement of the original, this function attempts to compensate for it in such a way
+ * that the clone stays unmoved or moves in parallel (depending on user setting) regardless of the
+ * clone's transform.
+ */
+void SPUse::move_compensate(Geom::Affine const *mp) {
+ // the clone is orphaned; or this is not a real use, but a clone of another use;
+ // we skip it, otherwise duplicate compensation will occur
+ if (this->cloned) {
+ return;
+ }
+
+ // never compensate uses which are used in flowtext
+ if (parent && dynamic_cast<SPFlowregion *>(parent)) {
+ return;
+ }
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ guint mode = prefs->getInt("/options/clonecompensation/value", SP_CLONE_COMPENSATION_PARALLEL);
+ // user wants no compensation
+ if (mode == SP_CLONE_COMPENSATION_NONE)
+ return;
+
+ Geom::Affine m(*mp);
+ Geom::Affine t = this->get_parent_transform();
+ Geom::Affine clone_move = t.inverse() * m * t;
+
+ // this is not a simple move, do not try to compensate
+ if (!(m.isTranslation())){
+ //BUT move clippaths accordingly.
+ //if clone has a clippath, move it accordingly
+ if (getClipObject()) {
+ for (auto &clip : getClipObject()->children) {
+ SPItem *item = (SPItem*) &clip;
+ if(item){
+ item->transform *= m;
+ Geom::Affine identity;
+ item->doWriteTransform(item->transform, &identity);
+ }
+ }
+ }
+ if (getMaskObject()) {
+ for (auto &mask : getMaskObject()->children) {
+ SPItem *item = (SPItem*) &mask;
+ if(item){
+ item->transform *= m;
+ Geom::Affine identity;
+ item->doWriteTransform(item->transform, &identity);
+ }
+ }
+ }
+ return;
+ }
+
+ // restore item->transform field from the repr, in case it was changed by seltrans
+ this->readAttr ("transform");
+
+
+ // calculate the compensation matrix and the advertized movement matrix
+ Geom::Affine advertized_move;
+ if (mode == SP_CLONE_COMPENSATION_PARALLEL) {
+ clone_move = clone_move.inverse() * m;
+ advertized_move = m;
+ } else if (mode == SP_CLONE_COMPENSATION_UNMOVED) {
+ clone_move = clone_move.inverse();
+ advertized_move.setIdentity();
+ } else {
+ g_assert_not_reached();
+ }
+
+ //if clone has a clippath, move it accordingly
+ if (getClipObject()) {
+ for (auto &clip : getClipObject()->children) {
+ SPItem *item = (SPItem*) &clip;
+ if(item){
+ item->transform *= clone_move.inverse();
+ Geom::Affine identity;
+ item->doWriteTransform(item->transform, &identity);
+ }
+ }
+ }
+ if (getMaskObject()) {
+ for (auto &mask : getMaskObject()->children) {
+ SPItem *item = (SPItem*) &mask;
+ if(item){
+ item->transform *= clone_move.inverse();
+ Geom::Affine identity;
+ item->doWriteTransform(item->transform, &identity);
+ }
+ }
+ }
+
+
+ // commit the compensation
+ this->transform *= clone_move;
+ this->doWriteTransform(this->transform, &advertized_move);
+ this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void SPUse::href_changed() {
+ this->_delete_connection.disconnect();
+ this->_transformed_connection.disconnect();
+
+ if (this->child) {
+ this->detach(this->child);
+ this->child = nullptr;
+ }
+
+ if (this->href) {
+ SPItem *refobj = this->ref->getObject();
+
+ if (refobj) {
+ Inkscape::XML::Node *childrepr = refobj->getRepr();
+
+ SPObject* obj = SPFactory::createObject(NodeTraits::get_type_string(*childrepr));
+
+ SPItem *item = dynamic_cast<SPItem *>(obj);
+ if (item) {
+ child = item;
+
+ this->attach(this->child, this->lastChild());
+ sp_object_unref(this->child, this);
+
+ this->child->invoke_build(this->document, childrepr, TRUE);
+
+ for (SPItemView *v = this->display; v != nullptr; v = v->next) {
+ Inkscape::DrawingItem *ai = this->child->invoke_show(v->arenaitem->drawing(), v->key, v->flags);
+
+ if (ai) {
+ v->arenaitem->prependChild(ai);
+ }
+ }
+ } else {
+ delete obj;
+ g_warning("Tried to create svg:use from invalid object");
+ }
+
+ this->_delete_connection = refobj->connectDelete(
+ sigc::hide(sigc::mem_fun(this, &SPUse::delete_self))
+ );
+
+ this->_transformed_connection = refobj->connectTransformed(
+ sigc::hide(sigc::mem_fun(this, &SPUse::move_compensate))
+ );
+ }
+ }
+}
+
+void SPUse::delete_self() {
+ // always delete uses which are used in flowtext
+ if (parent && dynamic_cast<SPFlowregion *>(parent)) {
+ deleteObject();
+ return;
+ }
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ guint const mode = prefs->getInt("/options/cloneorphans/value",
+ SP_CLONE_ORPHANS_UNLINK);
+
+ if (mode == SP_CLONE_ORPHANS_UNLINK) {
+ this->unlink();
+ } else if (mode == SP_CLONE_ORPHANS_DELETE) {
+ this->deleteObject();
+ }
+}
+
+void SPUse::update(SPCtx *ctx, unsigned flags) {
+ // std::cout << "SPUse::update: " << (getId()?getId():"null") << std::endl;
+ SPItemCtx *ictx = (SPItemCtx *) ctx;
+ SPItemCtx cctx = *ictx;
+
+ unsigned childflags = flags;
+ if (flags & SP_OBJECT_MODIFIED_FLAG) {
+ childflags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
+ }
+
+ childflags &= SP_OBJECT_MODIFIED_CASCADE;
+
+ /* Set up child viewport */
+ this->calcDimsFromParentViewport(ictx);
+
+ childflags &= ~SP_OBJECT_USER_MODIFIED_FLAG_B;
+
+ if (this->child) {
+ sp_object_ref(this->child);
+
+ // viewport is only changed if referencing a symbol or svg element
+ if( SP_IS_SYMBOL(this->child) || SP_IS_ROOT(this->child) ) {
+ cctx.viewport = Geom::Rect::from_xywh(0, 0, this->width.computed, this->height.computed);
+ cctx.i2vp = Geom::identity();
+ }
+
+ if (childflags || (this->child->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+ SPItem const *chi = dynamic_cast<SPItem const *>(child);
+ g_assert(chi != nullptr);
+ cctx.i2doc = chi->transform * ictx->i2doc;
+ cctx.i2vp = chi->transform * ictx->i2vp;
+ this->child->updateDisplay((SPCtx *)&cctx, childflags);
+ }
+
+ sp_object_unref(this->child);
+ }
+
+ SPItem::update(ctx, flags);
+
+ if (flags & SP_OBJECT_STYLE_MODIFIED_FLAG) {
+ for (SPItemView *v = this->display; v != nullptr; v = v->next) {
+ Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(v->arenaitem);
+ this->context_style = this->style;
+ g->setStyle(this->style, this->context_style);
+ }
+ }
+
+ /* As last step set additional transform of arena group */
+ for (SPItemView *v = this->display; v != nullptr; v = v->next) {
+ Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(v->arenaitem);
+ Geom::Affine t(Geom::Translate(this->x.computed, this->y.computed));
+ g->setChildTransform(t);
+ }
+}
+
+void SPUse::modified(unsigned int flags) {
+ // std::cout << "SPUse::modified: " << (getId()?getId():"null") << std::endl;
+ if (flags & SP_OBJECT_MODIFIED_FLAG) {
+ flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
+ }
+
+ flags &= SP_OBJECT_MODIFIED_CASCADE;
+
+ if (flags & SP_OBJECT_STYLE_MODIFIED_FLAG) {
+ for (SPItemView *v = this->display; v != nullptr; v = v->next) {
+ Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(v->arenaitem);
+ this->context_style = this->style;
+ g->setStyle(this->style, this->context_style);
+ }
+ }
+
+ if (child) {
+ sp_object_ref(child);
+
+ if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
+ child->emitModified(flags);
+ }
+
+ sp_object_unref(child);
+ }
+}
+
+SPItem *SPUse::unlink() {
+ Inkscape::XML::Node *repr = this->getRepr();
+
+ if (!repr) {
+ return nullptr;
+ }
+
+ Inkscape::XML::Node *parent = repr->parent();
+ SPDocument *document = this->document;
+ Inkscape::XML::Document *xml_doc = document->getReprDoc();
+
+ // Track the ultimate source of a chain of uses.
+ SPItem *orig = this->root();
+
+ if (!orig) {
+ return nullptr;
+ }
+
+ // Calculate the accumulated transform, starting from the original.
+ Geom::Affine t = this->get_root_transform();
+
+ Inkscape::XML::Node *copy = nullptr;
+
+ if (auto symbol = dynamic_cast<SPSymbol *>(orig)) {
+ // make a group, copy children
+ copy = xml_doc->createElement("svg:g");
+
+ for (Inkscape::XML::Node *child = orig->getRepr()->firstChild() ; child != nullptr; child = child->next()) {
+ Inkscape::XML::Node *newchild = child->duplicate(xml_doc);
+ copy->appendChild(newchild);
+ }
+
+ // viewBox transformation
+ t = symbol->c2p * t;
+ } else { // just copy
+ copy = orig->getRepr()->duplicate(xml_doc);
+ }
+
+ // Add the duplicate repr just after the existing one.
+ parent->addChild(copy, repr);
+
+ // Retrieve the SPItem of the resulting repr.
+ SPObject *unlinked = document->getObjectByRepr(copy);
+
+ // Merge style from the use.
+ unlinked->style->merge( this->style );
+ unlinked->style->cascade( unlinked->parent->style );
+ unlinked->updateRepr();
+
+ // Hold onto our SPObject and repr for now.
+ sp_object_ref(this);
+ Inkscape::GC::anchor(repr);
+
+ // Remove ourselves, not propagating delete events to avoid a
+ // chain-reaction with other elements that might reference us.
+ this->deleteObject(false);
+
+ // Give the copy our old id and let go of our old repr.
+ copy->setAttribute("id", repr->attribute("id"));
+ Inkscape::GC::release(repr);
+
+ // Remove tiled clone attrs.
+ copy->removeAttribute("inkscape:tiled-clone-of");
+ copy->removeAttribute("inkscape:tile-w");
+ copy->removeAttribute("inkscape:tile-h");
+ copy->removeAttribute("inkscape:tile-cx");
+ copy->removeAttribute("inkscape:tile-cy");
+
+ // Establish the succession and let go of our object.
+ this->setSuccessor(unlinked);
+ sp_object_unref(this);
+
+ SPItem *item = dynamic_cast<SPItem *>(unlinked);
+ g_assert(item != nullptr);
+
+ // Set the accummulated transform.
+ {
+ Geom::Affine nomove(Geom::identity());
+ // Advertise ourselves as not moving.
+ item->doWriteTransform(t, &nomove);
+ }
+
+ return item;
+}
+
+SPItem *SPUse::get_original() {
+ SPItem *ref = nullptr;
+
+ if (this->ref){
+ ref = this->ref->getObject();
+ }
+
+ return ref;
+}
+
+void SPUse::snappoints(std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs) const {
+ SPItem const *root = this->root();
+
+ if (!root) {
+ return;
+ }
+
+ root->snappoints(p, snapprefs);
+}
+
+
+/*
+ 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 :