1 files changed, 198 insertions, 0 deletions
diff --git a/src/object/sp-tag-use.cpp b/src/object/sp-tag-use.cpp
new file mode 100644
index 0000000..e4e664b
--- /dev/null
+++ b/src/object/sp-tag-use.cpp
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SVG <inkscape:tagref> implementation
+ *
+ * Authors:
+ *   Theodore Janeczko
+ *   Liam P White
+ *
+ * Copyright (C) Theodore Janeczko 2012-2014 <flutterguy317@gmail.com>
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "sp-tag-use.h"
+
+#include <cstring>
+#include <string>
+
+#include <glibmm/i18n.h>
+
+#include "bad-uri-exception.h"
+#include "display/drawing-group.h"
+#include "attributes.h"
+#include "document.h"
+#include "uri.h"
+#include "xml/repr.h"
+#include "preferences.h"
+#include "style.h"
+#include "sp-factory.h"
+#include "sp-symbol.h"
+#include "sp-tag-use-reference.h"
+
+SPTagUse::SPTagUse()
+{
+    href = nullptr;
+    //new (_changed_connection) sigc::connection;
+    ref = new SPTagUseReference(this);
+    
+    _changed_connection = ref->changedSignal().connect(sigc::mem_fun(*this, &SPTagUse::href_changed));
+}
+
+SPTagUse::~SPTagUse()
+{
+
+    if (child) {
+        detach(child);
+        child = nullptr;
+    }
+
+    ref->detach();
+    delete ref;
+    ref = nullptr;
+
+    _changed_connection.~connection(); //FIXME why?
+}
+
+void
+SPTagUse::build(SPDocument *document, Inkscape::XML::Node *repr)
+{
+    SPObject::build(document, repr);
+    readAttr(SPAttr::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 sp_tag_use_href_changed, and that will take care of the child
+}
+
+void
+SPTagUse::release()
+{
+
+    if (child) {
+        detach(child);
+        child = nullptr;
+    }
+
+    _changed_connection.disconnect();
+
+    g_free(href);
+    href = nullptr;
+
+    ref->detach();
+
+    SPObject::release();
+}
+
+void
+SPTagUse::set(SPAttr key, gchar const *value)
+{
+
+    switch (key) {
+        case SPAttr::XLINK_HREF: {
+            if ( value && href && ( strcmp(value, href) == 0 ) ) {
+                /* No change, do nothing. */
+            } else {
+                g_free(href);
+                href = nullptr;
+                if (value) {
+                    // First, set the href field, because sp_tag_use_href_changed will need it.
+                    href = g_strdup(value);
+
+                    // Now do the attaching, which emits the changed signal.
+                    try {
+                        ref->attach(Inkscape::URI(value));
+                    } catch (Inkscape::BadURIException &e) {
+                        g_warning("%s", e.what());
+                        ref->detach();
+                    }
+                } else {
+                    ref->detach();
+                }
+            }
+            break;
+        }
+
+        default:
+                SPObject::set(key, value);
+            break;
+    }
+}
+
+Inkscape::XML::Node *
+SPTagUse::write(Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)
+{
+    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
+        repr = xml_doc->createElement("inkscape:tagref");
+    }
+
+    SPObject::write(xml_doc, repr, flags);
+    
+    if (ref->getURI()) {
+        auto uri_string = ref->getURI()->str();
+        repr->setAttributeOrRemoveIfEmpty("xlink:href", uri_string);
+    }
+
+    return repr;
+}
+
+/**
+ * Returns the ultimate original of a SPTagUse (i.e. the first object in the chain of its originals
+ * which is not an SPTagUse). 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 SPTagUse (of the argument one for
+ * the trivial case) and not the "true original".
+ */
+ 
+SPItem * SPTagUse::root()
+{
+    SPObject *orig = child;
+    while (orig && SP_IS_TAG_USE(orig)) {
+        orig = SP_TAG_USE(orig)->child;
+    }
+    if (!orig || !SP_IS_ITEM(orig))
+        return nullptr;
+    return SP_ITEM(orig);
+}
+
+void
+SPTagUse::href_changed(SPObject */*old_ref*/, SPObject */*ref*/)
+{
+    if (href) {
+        SPItem *refobj = ref->getObject();
+        if (refobj) {
+            Inkscape::XML::Node *childrepr = refobj->getRepr();
+            const std::string typeString = NodeTraits::get_type_string(*childrepr);
+            
+            SPObject* child_ = SPFactory::createObject(typeString);
+            if (child_) {
+                child = child_;
+                attach(child_, lastChild());
+                sp_object_unref(child_, nullptr);
+                child_->invoke_build(this->document, childrepr, TRUE);
+
+            }
+        }
+    }
+}
+
+SPItem * SPTagUse::get_original()
+{
+    SPItem *ref_ = nullptr;
+    if (ref) {
+        ref_ = ref->getObject();
+    }
+    return ref_;
+}
+
+/*
+  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 :