1 files changed, 111 insertions, 0 deletions
diff --git a/src/object/persp3d-reference.cpp b/src/object/persp3d-reference.cpp
new file mode 100644
index 0000000..294c62d
--- /dev/null
+++ b/src/object/persp3d-reference.cpp
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * The reference corresponding to the inkscape:perspectiveID attribute
+ *
+ * Copyright (C) 2007 Johan Engelen
+ * Copyright (C) 2007 Maximilian Albert
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "persp3d-reference.h"
+#include "uri.h"
+
+static void persp3dreference_href_changed(SPObject *old_ref, SPObject *ref, Persp3DReference *persp3dref);
+static void persp3dreference_delete_self(SPObject *deleted, Persp3DReference *persp3dref);
+static void persp3dreference_source_modified(SPObject *iSource, guint flags, Persp3DReference *persp3dref);
+
+Persp3DReference::Persp3DReference(SPObject* i_owner) : URIReference(i_owner)
+{
+    owner=i_owner;
+    persp_href = nullptr;
+    persp_repr = nullptr;
+    persp = nullptr;
+    _changed_connection = changedSignal().connect(sigc::bind(sigc::ptr_fun(persp3dreference_href_changed), this)); // listening to myself, this should be virtual instead
+}
+
+Persp3DReference::~Persp3DReference()
+{
+    _changed_connection.disconnect(); // to do before unlinking
+
+    quit_listening();
+    unlink();
+}
+
+bool
+Persp3DReference::_acceptObject(SPObject *obj) const
+{
+    return SP_IS_PERSP3D(obj) && URIReference::_acceptObject(obj);
+;
+    /* effic: Don't bother making this an inline function: _acceptObject is a virtual function,
+       typically called from a context where the runtime type is not known at compile time. */
+}
+
+void
+Persp3DReference::unlink()
+{
+    g_free(persp_href);
+    persp_href = nullptr;
+    detach();
+}
+
+void
+Persp3DReference::start_listening(Persp3D* to)
+{
+    if ( to == nullptr ) {
+        return;
+    }
+    persp = to;
+    persp_repr = to->getRepr();
+    _delete_connection = to->connectDelete(sigc::bind(sigc::ptr_fun(&persp3dreference_delete_self), this));
+    _modified_connection = to->connectModified(sigc::bind<2>(sigc::ptr_fun(&persp3dreference_source_modified), this));
+}
+
+void
+Persp3DReference::quit_listening()
+{
+    if ( persp == nullptr ) {
+        return;
+    }
+    _modified_connection.disconnect();
+    _delete_connection.disconnect();
+    persp_repr = nullptr;
+    persp = nullptr;
+}
+
+static void
+persp3dreference_href_changed(SPObject */*old_ref*/, SPObject */*ref*/, Persp3DReference *persp3dref)
+{
+    persp3dref->quit_listening();
+    Persp3D *refobj = SP_PERSP3D(persp3dref->getObject());
+    if ( refobj ) {
+        persp3dref->start_listening(refobj);
+    }
+
+    persp3dref->owner->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+static void
+persp3dreference_delete_self(SPObject */*deleted*/, Persp3DReference *persp3dref)
+{
+    g_return_if_fail(persp3dref->owner);
+    persp3dref->owner->deleteObject();
+}
+
+static void
+persp3dreference_source_modified(SPObject */*iSource*/, guint /*flags*/, Persp3DReference *persp3dref)
+{
+    persp3dref->owner->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+}
+
+
+/*
+  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:fileencoding=utf-8:textwidth=99 :