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diff --git a/src/ui/dialog/dialog-container.h b/src/ui/dialog/dialog-container.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef INKSCAPE_UI_DIALOG_CONTAINER_H
+#define INKSCAPE_UI_DIALOG_CONTAINER_H
+
+/** @file
+ * @brief A widget that manages DialogNotebook's and other widgets inside a horizontal DialogMultipaned.
+ *
+ * Authors: see git history
+ *   Tavmjong Bah
+ *
+ * Copyright (c) 2018 Tavmjong Bah, Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gdkmm/dragcontext.h>
+#include <glibmm/refptr.h>
+#include <glibmm/ustring.h>
+#include <glibmm/keyfile.h>
+#include <gtkmm/accelkey.h>
+#include <gtkmm/box.h>
+#include <gtkmm/targetentry.h>
+#include <iostream>
+#include <map>
+#include <set>
+#include <memory>
+#include "dialog-manager.h"
+#include "desktop.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Dialog {
+
+class DialogBase;
+class DialogNotebook;
+class DialogMultipaned;
+class DialogWindow;
+
+/**
+ * A widget that manages DialogNotebook's and other widgets inside a
+ * horizontal DialogMultipaned containing vertical DialogMultipaned's or other widgets.
+ */
+class DialogContainer : public Gtk::Box
+{
+    using parent_type = Gtk::Box;
+
+public:
+    DialogContainer(InkscapeWindow* inkscape_window);
+    ~DialogContainer() override;
+
+    // Columns-related functions
+    DialogMultipaned *get_columns() { return columns; }
+    DialogMultipaned *create_column();
+
+    // Dialog-related functions
+    void new_dialog(const Glib::ustring& dialog_type);
+
+    DialogWindow* new_floating_dialog(const Glib::ustring& dialog_type);
+    bool has_dialog_of_type(DialogBase *dialog);
+    DialogBase *get_dialog(const Glib::ustring& dialog_type);
+    void link_dialog(DialogBase *dialog);
+    void unlink_dialog(DialogBase *dialog);
+    const std::multimap<Glib::ustring, DialogBase *> *get_dialogs() { return &dialogs; };
+    void toggle_dialogs();
+    void update_dialogs(); // Update all linked dialogs
+    void set_inkscape_window(InkscapeWindow *inkscape_window);
+    InkscapeWindow* get_inkscape_window() { return _inkscape_window; }
+
+    // State saving functionality
+    std::unique_ptr<Glib::KeyFile> save_container_state();
+    void load_container_state(Glib::KeyFile* keyfile, bool include_floating);
+
+    void restore_window_position(DialogWindow* window);
+    void store_window_position(DialogWindow* window);
+
+    // get this container's state; provide window position for container embedded in DialogWindow
+    std::shared_ptr<Glib::KeyFile> get_container_state(const window_position_t* position) const;
+    void load_container_state(Glib::KeyFile& state, const std::string& window_id);
+
+private:
+    InkscapeWindow *_inkscape_window = nullptr;   // Every container is attached to an InkscapeWindow.
+    DialogMultipaned *columns = nullptr;          // The main widget inside which other children are kept.
+    std::vector<Gtk::TargetEntry> target_entries; // What kind of object can be dropped.
+
+    /**
+     * Due to the way Gtk handles dragging between notebooks, one can
+     * either allow multiple instances of the same dialog in a notebook
+     * or restrict dialogs to docks tied to a particular document
+     * window. (More explicitly, use one group name for all notebooks or
+     * use a unique group name for each document window with related
+     * floating docks.) For the moment we choose the former which
+     * requires a multimap here as we use the dialog type as a key.
+     */
+    std::multimap<Glib::ustring, DialogBase *>dialogs;
+
+    void new_dialog(const Glib::ustring& dialog_type, DialogNotebook* notebook);
+    DialogBase *dialog_factory(const Glib::ustring& dialog_type);
+    Gtk::Widget *create_notebook_tab(Glib::ustring label, Glib::ustring image, const Glib::ustring shortcut);
+    DialogWindow* create_new_floating_dialog(const Glib::ustring& dialog_type, bool blink);
+
+    // Signal connections
+    std::vector<sigc::connection> connections;
+
+    // Handlers
+    void on_unrealize() override;
+    DialogNotebook *prepare_drop(const Glib::RefPtr<Gdk::DragContext> context);
+    void prepend_drop(const Glib::RefPtr<Gdk::DragContext> context, DialogMultipaned *column);
+    void append_drop(const Glib::RefPtr<Gdk::DragContext> context, DialogMultipaned *column);
+    void column_empty(DialogMultipaned *column);
+    DialogBase* find_existing_dialog(const Glib::ustring& dialog_type);
+    static bool recreate_dialogs_from_state(InkscapeWindow* inkscape_window, const Glib::KeyFile* keyfile);
+};
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INKSCAPE_UI_DIALOG_CONTAINER_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 :