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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef SEEN_SP_URI_REFERENCES_H
+#define SEEN_SP_URI_REFERENCES_H
+
+/*
+ * Helper methods for resolving URI References
+ *
+ * Authors:
+ * Lauris Kaplinski <lauris@kaplinski.com>
+ * Abhishek Sharma
+ *
+ * Copyright (C) 2001-2002 Lauris Kaplinski
+ * Copyright (C) 2001 Ximian, Inc.
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <cstddef>
+#include <vector>
+#include <set>
+#include <sigc++/connection.h>
+#include <sigc++/trackable.h>
+
+class SPObject;
+class SPDocument;
+
+namespace Inkscape {
+
+class URI;
+
+/**
+ * A class encapsulating a reference to a particular URI; observers can
+ * be notified when the URI comes to reference a different SPObject.
+ *
+ * The URIReference increments and decrements the SPObject's hrefcount
+ * automatically.
+ *
+ * @see SPObject
+ */
+class URIReference : public sigc::trackable {
+public:
+ /**
+ * Constructor.
+ *
+ * @param owner The object on whose behalf this URIReference
+ * is holding a reference to the target object.
+ */
+ URIReference(SPObject *owner);
+ URIReference(SPDocument *owner_document);
+
+ /* Definition-less to prevent accidental use. */
+ void operator=(URIReference const& ref) = delete;
+
+ /**
+ * Destructor. Calls shutdown() if the reference has not been
+ * shut down yet.
+ */
+ virtual ~URIReference();
+
+ /**
+ * Attaches to a URI, relative to the specified document.
+ *
+ * Throws a BadURIException if the URI is unsupported,
+ * or the fragment identifier is xpointer and malformed.
+ *
+ * @param uri the URI to watch
+ */
+ void attach(URI const& uri);
+
+ /**
+ * Try to attach to a URI. Return false if URL is malformed and detach any
+ * previous attachment.
+ */
+ bool try_attach(char const *uri);
+
+ /**
+ * Detaches from the currently attached URI target, if any;
+ * the current referrent is signaled as NULL.
+ */
+ void detach();
+
+ /**
+ * @brief Returns a pointer to the current referrent of the
+ * attached URI, or NULL.
+ *
+ * @return a pointer to the referenced SPObject or NULL
+ */
+ SPObject *getObject() const { return _obj; }
+
+ /**
+ * @brief Returns a pointer to the URIReference's owner
+ *
+ * @return a pointer to the URIReference's owner
+ */
+ SPObject *getOwner() const { return _owner; }
+
+ /**
+ * Accessor for the referrent change notification signal;
+ * this signal is emitted whenever the URIReference's
+ * referrent changes.
+ *
+ * Signal handlers take two parameters: the old and new
+ * referrents.
+ *
+ * @returns a signal
+ */
+ sigc::signal<void, SPObject *, SPObject *> changedSignal() {
+ return _changed_signal;
+ }
+
+ /**
+ * Returns a pointer to a URI containing the currently attached
+ * URI, or NULL if no URI is currently attached.
+ *
+ * @returns the currently attached URI, or NULL
+ */
+ URI const* getURI() const {
+ return _uri;
+ }
+
+ /**
+ * Returns true if there is currently an attached URI
+ *
+ * @returns true if there is an attached URI
+ */
+ bool isAttached() const {
+ return (bool)_uri;
+ }
+
+ SPDocument *getOwnerDocument() { return _owner_document; }
+ SPObject *getOwnerObject() { return _owner; }
+
+protected:
+ virtual bool _acceptObject(SPObject *obj) const;
+private:
+ SPObject *_owner;
+ SPDocument *_owner_document;
+ sigc::connection _connection;
+ sigc::connection _release_connection;
+ SPObject *_obj;
+ URI *_uri;
+
+ sigc::signal<void, SPObject *, SPObject *> _changed_signal;
+
+ void _setObject(SPObject *object);
+ void _release(SPObject *object);
+};
+
+}
+
+/**
+ * Resolves an item referenced by a URI in CSS form contained in "url(...)"
+ */
+SPObject* sp_css_uri_reference_resolve( SPDocument *document, const char *uri );
+
+SPObject *sp_uri_reference_resolve (SPDocument *document, const char *uri);
+
+#endif // SEEN_SP_URI_REFERENCES_H
+
+/*
+ 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 :