1 files changed, 97 insertions, 0 deletions
diff --git a/src/document-undo.h b/src/document-undo.h
new file mode 100644
index 0000000..937fa8b
--- /dev/null
+++ b/src/document-undo.h
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#ifndef SEEN_SP_DOCUMENT_UNDO_H
+#define SEEN_SP_DOCUMENT_UNDO_H
+
+#include <glib.h>   // gboolean, gchar
+
+namespace Glib {
+    class ustring;
+}
+
+class SPDocument;
+
+namespace Inkscape {
+
+class DocumentUndo
+{
+public:
+
+    /**
+     * Set undo sensitivity.
+     *
+     * Don't use this to temporarily turn sensitivity off, use ScopedInsensitive instead.
+    */
+    static void setUndoSensitive(SPDocument *doc, bool sensitive);
+
+    static bool getUndoSensitive(SPDocument const *document);
+
+    static void clearUndo(SPDocument *document);
+
+    static void clearRedo(SPDocument *document);
+
+    /* undo_icon is only used in History dialog. */
+    static void done(SPDocument *document, Glib::ustring const &event_description, Glib::ustring const &undo_icon);
+
+    static void maybeDone(SPDocument *document, const gchar *keyconst, Glib::ustring const &event_description, Glib::ustring const &undo_icon);
+
+private:
+    static void finish_incomplete_transaction(SPDocument &document);
+
+    static void perform_document_update(SPDocument &document);
+
+public:
+    static void resetKey(SPDocument *document);
+
+    static void cancel(SPDocument *document);
+
+    static gboolean undo(SPDocument *document);
+
+    static gboolean redo(SPDocument *document);
+
+    /**
+     * RAII-style mechanism for creating a temporary undo-insensitive context.
+     *
+     * \verbatim
+        {
+            DocumentUndo::ScopedInsensitive tmp(document);
+            ... do stuff ...
+            // "tmp" goes out of scope here and automatically restores undo-sensitivity
+        } \endverbatim
+     */
+    class ScopedInsensitive {
+        SPDocument * m_doc;
+        bool m_saved;
+
+      public:
+        ScopedInsensitive(SPDocument *doc)
+            : m_doc(doc)
+        {
+            m_saved = getUndoSensitive(doc);
+            setUndoSensitive(doc, false);
+        }
+        ~ScopedInsensitive() { setUndoSensitive(m_doc, m_saved); }
+    };
+};
+
+} // namespace Inkscape
+
+#endif // SEEN_SP_DOCUMENT_UNDO_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:textwidth=99 :