1 files changed, 160 insertions, 0 deletions
diff --git a/src/live_effects/lpeobject-reference.cpp b/src/live_effects/lpeobject-reference.cpp
new file mode 100644
index 0000000..700b8f5
--- /dev/null
+++ b/src/live_effects/lpeobject-reference.cpp
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * The reference corresponding to the inkscape:live-effect attribute
+ *
+ * Copyright (C) 2007 Johan Engelen
+ *
+ * Release under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/lpeobject-reference.h"
+#include "live_effects/effect.h"
+
+#include <cstring>
+
+#include "bad-uri-exception.h"
+#include "live_effects/lpeobject.h"
+#include "object/uri.h"
+
+namespace Inkscape {
+
+namespace LivePathEffect {
+
+static void lpeobjectreference_href_changed(SPObject *old_ref, SPObject *ref, LPEObjectReference *lpeobjref);
+static void lpeobjectreference_release_self(SPObject *release, LPEObjectReference *lpeobjref);
+static void lpeobjectreference_source_modified(SPObject *iSource, guint flags, LPEObjectReference *lpeobjref);
+
+LPEObjectReference::LPEObjectReference(SPObject* i_owner) : URIReference(i_owner)
+{
+    owner=i_owner;
+    lpeobject_href = nullptr;
+    lpeobject_repr = nullptr;
+    lpeobject = nullptr;
+    _changed_connection = changedSignal().connect(sigc::bind(sigc::ptr_fun(lpeobjectreference_href_changed), this)); // listening to myself, this should be virtual instead
+
+    user_unlink = nullptr;
+}
+
+LPEObjectReference::~LPEObjectReference()
+{
+    _changed_connection.disconnect(); // to do before unlinking
+
+    quit_listening();
+    unlink();
+}
+
+bool LPEObjectReference::_acceptObject(SPObject * const obj) const
+{
+    LivePathEffectObject *lpobj = dynamic_cast<LivePathEffectObject *>(obj);
+    if (lpobj) {
+        return URIReference::_acceptObject(obj);
+    } else {
+        return false;
+    }
+}
+
+void
+LPEObjectReference::link(const char *to)
+{
+    if (!to || !to[0]) {
+        quit_listening();
+        unlink();
+    } else {
+        if ( !lpeobject_href || ( strcmp(to, lpeobject_href) != 0 ) ) {
+            if (lpeobject_href) {
+                g_free(lpeobject_href);
+            }
+            lpeobject_href = 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
+LPEObjectReference::unlink()
+{
+    if (lpeobject_href) {
+        g_free(lpeobject_href);
+        lpeobject_href = nullptr;
+    }
+    detach();
+}
+
+void
+LPEObjectReference::start_listening(LivePathEffectObject* to)
+{
+    if ( to == nullptr ) {
+        return;
+    }
+    lpeobject = to;
+    lpeobject_repr = to->getRepr();
+    _release_connection = to->connectRelease(sigc::bind(sigc::ptr_fun(&lpeobjectreference_release_self), this));
+    _modified_connection = to->connectModified(sigc::bind<2>(sigc::ptr_fun(&lpeobjectreference_source_modified), this));
+}
+
+void
+LPEObjectReference::quit_listening()
+{
+    _modified_connection.disconnect();
+    _release_connection.disconnect();
+    lpeobject_repr = nullptr;
+    lpeobject = nullptr;
+}
+
+static void
+lpeobjectreference_href_changed(SPObject */*old_ref*/, SPObject */*ref*/, LPEObjectReference *lpeobjref)
+{
+    //lpeobjref->quit_listening();
+    LivePathEffectObject *refobj = dynamic_cast<LivePathEffectObject *>( lpeobjref->getObject() );
+    if ( refobj ) {
+        lpeobjref->start_listening(refobj);
+    }
+    if (lpeobjref->owner) {
+        lpeobjref->owner->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+    }
+}
+
+static void
+lpeobjectreference_release_self(SPObject */*release*/, LPEObjectReference *lpeobjref)
+{
+    lpeobjref->quit_listening();
+    lpeobjref->unlink();
+    if (lpeobjref->user_unlink) {
+        lpeobjref->user_unlink(lpeobjref, lpeobjref->owner);
+    }
+    
+}
+
+static void
+lpeobjectreference_source_modified(SPObject */*iSource*/, guint /*flags*/, LPEObjectReference *lpeobjref)
+{
+//    We dont need to request update when LPE XML is updated
+//    Retain it temporary, drop if no regression
+//    SPObject *owner_obj = lpeobjref->owner;
+//    if (owner_obj) {
+//        lpeobjref->owner->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
+//    }
+}
+
+} //namespace LivePathEffect
+
+} // namespace inkscape
+
+/*
+  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 :