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diff --git a/src/ui/dialog/dialog-base.h b/src/ui/dialog/dialog-base.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef INK_DIALOG_BASE_H
+#define INK_DIALOG_BASE_H
+
+/** @file
+ * @brief A base class for all dialogs.
+ *
+ * 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 <glibmm/ustring.h>
+#include <gtkmm/box.h>
+
+#include "inkscape-application.h"
+
+class SPDesktop;
+
+namespace Inkscape {
+namespace UI {
+namespace Dialog {
+
+/**
+ * DialogBase is the base class for the dialog system.
+ *
+ * Each dialog has a reference to the application, in order to update it's inner focus
+ * (be it of the active desktop, document, selection, etc.) in the update() method.
+ *
+ * DialogsBase derived classes' instances live in DialogNotebook classes and are managed by
+ * DialogContainer classes. DialogContainer instances can have at most one type of dialog,
+ * differentiated by the associated type.
+ */
+class DialogBase : public Gtk::Box
+{
+    using parent_type = Gtk::Box;
+
+public:
+    DialogBase(gchar const *prefs_path = nullptr, Glib::ustring dialog_type = "");
+    ~DialogBase() override;
+
+    /**
+     * The update() method is essential to Gtk state management. DialogBase implementations get updated whenever
+     * a new focus event happens if they are in a DialogWindow or if they are in the currently focused window.
+     *
+     * DO NOT use update to keep SPDesktop, SPDocument or Selection states, use the virtual functions below.
+     */
+    virtual void update() {}
+
+    // Public for future use, say if the desktop is smartly set when docking dialogs.
+    void setDesktop(SPDesktop *new_desktop);
+
+    void on_map() override;
+
+    /*
+     * Often the dialog won't request the right size until the window has
+     * been pushed to resize all it's children. We do this on dialog creation
+     * and destruction.
+     */
+    void ensure_size();
+
+    // Getters and setters
+    Glib::ustring get_name() { return _name; };
+    const Glib::ustring& getPrefsPath() const { return _prefs_path; }
+    Glib::ustring const &get_type() const { return _dialog_type; }
+
+    void blink();
+    // find focusable widget to grab focus
+    void focus_dialog();
+    // return focus back to canvas
+    void defocus_dialog();
+    bool getShowing() { return _showing; }
+    // fix children scrolled windows to send outer scroll when his own reach limits
+    void fix_inner_scroll(Gtk::Widget *child);
+    // Too many dialogs have unprotected calls to ask for this data
+    SPDesktop *getDesktop() const { return desktop; }
+protected:
+    InkscapeApplication *getApp() const { return _app; }
+    SPDocument *getDocument() const { return document; }
+    Selection *getSelection() const { return selection; }
+    friend class DialogNotebook;
+    void setShowing(bool showing);
+    Glib::ustring _name;             // Gtk widget name (must be set!)
+    Glib::ustring const _prefs_path; // Stores characteristic path for loading/saving the dialog position.
+    Glib::ustring const _dialog_type; // Type of dialog (we could just use _pref_path?).
+private:
+    bool blink_off(); // timer callback
+    bool on_key_press_event(GdkEventKey* key_event) override;
+    // return if dialog is on visible tab
+    bool _showing = true;
+    void unsetDesktop();
+    void desktopDestroyed(SPDesktop* old_desktop);
+    void setDocument(SPDocument *new_document);
+    /**
+     * Called when the desktop has certainly changed. It may have changed to nullptr
+     * when destructing the dialog, so the override should expect nullptr too.
+     */
+    virtual void desktopReplaced() {}
+    virtual void documentReplaced() {}
+    void selectionChanged_impl(Inkscape::Selection *selection);
+    void selectionModified_impl(Inkscape::Selection *selection, guint flags);
+    virtual void selectionChanged(Inkscape::Selection *selection) {};
+    virtual void selectionModified(Inkscape::Selection *selection, guint flags) {};
+
+    sigc::connection _desktop_destroyed;
+    sigc::connection _doc_replaced;
+    sigc::connection _select_changed;
+    sigc::connection _select_modified;
+
+    InkscapeApplication *_app; // Used for state management
+    SPDesktop *desktop;
+    SPDocument *document;
+    Selection *selection;
+};
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INK_DIALOG_BASE_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 :