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diff --git a/src/ui/dialog/dialog-manager.h b/src/ui/dialog/dialog-manager.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief Object for managing a set of dialogs, including their signals and
+ *        construction/caching/destruction of them.
+ */
+/* Author:
+ *   Bryce W. Harrington <bryce@bryceharrington.org>
+ *   Jon Phillips <jon@rejon.org>
+ *
+ * Copyright (C) 2004, 2005 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_UI_DIALOG_MANAGER_H
+#define INKSCAPE_UI_DIALOG_MANAGER_H
+
+#include "dialog.h"
+#include <map>
+
+namespace Inkscape {
+namespace UI {
+namespace Dialog {
+
+class DialogManager {
+public:
+    typedef Dialog *(*DialogFactory)();
+
+    DialogManager();
+    virtual ~DialogManager();
+
+    static DialogManager &getInstance();
+
+    // sigc::signal<void> show_dialogs;
+    // sigc::signal<void> show_f12;
+    // sigc::signal<void> hide_dialogs;
+    // sigc::signal<void> hide_f12;
+    // sigc::signal<void> transientize;
+
+    /* generic dialog management start */
+    typedef std::map<GQuark, DialogFactory> FactoryMap;
+    typedef std::map<GQuark, Dialog*> DialogMap;
+
+    void registerFactory(gchar const *name, DialogFactory factory);
+    void registerFactory(GQuark name, DialogFactory factory);
+    Dialog *getDialog(gchar const* dlgName); 
+    Dialog *getDialog(GQuark dlgName); 
+    void showDialog(gchar const *name, bool grabfocus=true);
+    void showDialog(GQuark name, bool grabfocus=true);
+
+protected:
+    DialogManager(DialogManager const &d); // no copy
+    DialogManager& operator=(DialogManager const &d); // no assign
+
+    FactoryMap _factory_map; //< factories to create dialogs
+    DialogMap _dialog_map; //< map of already created dialogs
+};
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif //INKSCAPE_UI_DIALOG_MANAGER_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 :