1 files changed, 133 insertions, 0 deletions
diff --git a/src/object/sp-tag-use-reference.cpp b/src/object/sp-tag-use-reference.cpp
new file mode 100644
index 0000000..6b7bd9b
--- /dev/null
+++ b/src/object/sp-tag-use-reference.cpp
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * The reference corresponding to href of <inkscape:tagref> element.
+ *
+ * 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-reference.h"
+
+#include <cstring>
+#include <string>
+
+#include "bad-uri-exception.h"
+#include "preferences.h"
+#include "sp-shape.h"
+#include "sp-text.h"
+#include "uri.h"
+
+
+bool SPTagUseReference::_acceptObject(SPObject * const obj) const
+{
+    if (SP_IS_ITEM(obj)) {
+        return URIReference::_acceptObject(obj);
+    } else {
+        return false;
+    }
+}
+
+
+static void sp_usepath_href_changed(SPObject *old_ref, SPObject *ref, SPTagUsePath *offset);
+static void sp_usepath_delete_self(SPObject *deleted, SPTagUsePath *offset);
+
+SPTagUsePath::SPTagUsePath(SPObject* i_owner):SPTagUseReference(i_owner)
+{
+    owner=i_owner;
+    sourceDirty=false;
+    sourceHref = nullptr;
+    sourceRepr = nullptr;
+    sourceObject = nullptr;
+    _changed_connection = changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_usepath_href_changed), this)); // listening to myself, this should be virtual instead
+
+    user_unlink = nullptr;
+}
+
+SPTagUsePath::~SPTagUsePath()
+{
+    _changed_connection.disconnect(); // to do before unlinking
+
+    quit_listening();
+    unlink();
+}
+
+void
+SPTagUsePath::link(char *to)
+{
+    if ( to == nullptr ) {
+        quit_listening();
+        unlink();
+    } else {
+        if ( !sourceHref || ( strcmp(to, sourceHref) != 0 ) ) {
+            g_free(sourceHref);
+            sourceHref = g_strdup(to);
+            try {
+                attach(Inkscape::URI(to));
+            } catch (Inkscape::BadURIException &e) {
+                /* TODO: Proper error handling as per
+                 * http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing.
+                 */
+                g_warning("%s", e.what());
+                detach();
+            }
+        }
+    }
+}
+
+void
+SPTagUsePath::unlink()
+{
+    g_free(sourceHref);
+    sourceHref = nullptr;
+    detach();
+}
+
+void
+SPTagUsePath::start_listening(SPObject* to)
+{
+    if ( to == nullptr ) {
+        return;
+    }
+    sourceObject = to;
+    sourceRepr = to->getRepr();
+    _delete_connection = to->connectDelete(sigc::bind(sigc::ptr_fun(&sp_usepath_delete_self), this));
+}
+
+void
+SPTagUsePath::quit_listening()
+{
+    if ( sourceObject == nullptr ) {
+        return;
+    }
+    _delete_connection.disconnect();
+    sourceRepr = nullptr;
+    sourceObject = nullptr;
+}
+
+static void
+sp_usepath_href_changed(SPObject */*old_ref*/, SPObject */*ref*/, SPTagUsePath *offset)
+{
+    offset->quit_listening();
+    SPItem *refobj = offset->getObject();
+    if ( refobj ) {
+        offset->start_listening(refobj);
+    }
+}
+
+static void
+sp_usepath_delete_self(SPObject */*deleted*/, SPTagUsePath *offset)
+{
+    offset->owner->deleteObject();
+}
+
+/*
+  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 :