1 files changed, 66 insertions, 0 deletions
diff --git a/src/object/sp-shape-reference.cpp b/src/object/sp-shape-reference.cpp
new file mode 100644
index 0000000..1e302b4
--- /dev/null
+++ b/src/object/sp-shape-reference.cpp
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Reference class for shapes (SVG 2 text).
+ *
+ * Copyright (C) 2020 Authors
+ */
+
+#include "sp-shape-reference.h"
+#include "object/sp-text.h"
+
+SPShapeReference::SPShapeReference(SPObject *obj)
+    : URIReference(obj)
+{
+    // The text object can be detached from the document but still be
+    // referenced, and its style (who's the owner of the SPShapeReference)
+    // can also still be referenced even after the object got destroyed.
+    _owner_release_connection = obj->connectRelease([this](SPObject *text_object) {
+        assert(text_object == this->getOwner());
+
+        // Fully detach to prevent reconnecting with a shape's modified signal
+        this->detach();
+
+        this->_owner_release_connection.disconnect();
+    });
+
+    // https://www.w3.org/TR/SVG/text.html#TextShapeInside
+    // Applies to: 'text' elements
+    // Inherited: no
+    if (!dynamic_cast<SPText *>(obj)) {
+        g_warning("shape reference on non-text object: %s", typeid(*obj).name());
+        return;
+    }
+
+    // Listen to the shape's modified event to keep the text layout updated
+    changedSignal().connect([this](SPObject *, SPObject *shape_object) {
+        this->_shape_modified_connection.disconnect();
+
+        if (shape_object) {
+            this->_shape_modified_connection =
+                shape_object->connectModified(sigc::mem_fun(*this, &SPShapeReference::on_shape_modified));
+        }
+    });
+}
+
+SPShapeReference::~SPShapeReference()
+{ //
+    _shape_modified_connection.disconnect();
+    _owner_release_connection.disconnect();
+}
+
+/**
+ * Slot to connect to the shape's modified signal. Requests display update of the text object.
+ */
+void SPShapeReference::on_shape_modified(SPObject *shape_object, unsigned flags)
+{
+    auto *text_object = getOwner();
+
+    assert(text_object);
+    assert(shape_object == getObject());
+
+    if ((flags & SP_OBJECT_MODIFIED_FLAG)) {
+        text_object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_TEXT_LAYOUT_MODIFIED_FLAG);
+    }
+}
+
+// vim: filetype=cpp:expandtab:shiftwidth=4:softtabstop=4:fileencoding=utf-8:textwidth=99 :