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diff --git a/src/ui/dialog/align-and-distribute.h b/src/ui/dialog/align-and-distribute.h
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+++ b/src/ui/dialog/align-and-distribute.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief Align and Distribute widget
+ */
+/* Authors:
+ *   Tavmjong Bah
+ *
+ *   Based on dialog by:
+ *     Bryce W. Harrington <bryce@bryceharrington.org>
+ *     Aubanel MONNIER <aubi@libertysurf.fr>
+ *     Frank Felfe <innerspace@iname.com>
+ *     Lauris Kaplinski <lauris@kaplinski.com>
+ *
+ * Copyright (C) 2021 Tavmjong Bah
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_UI_WIDGET_ALIGN_AND_DISTRIBUTE_H
+#define INKSCAPE_UI_WIDGET_ALIGN_AND_DISTRIBUTE_H
+
+#include <sigc++/connection.h>
+#include <gtkmm.h>
+
+#include "preferences.h"
+
+class SPDesktop;
+
+namespace Inkscape {
+namespace UI {
+
+namespace Tools {
+class ToolBase;
+}
+
+namespace Dialog {
+class DialogBase;
+
+class AlignAndDistribute : public Gtk::Box
+{
+public:
+    AlignAndDistribute(Inkscape::UI::Dialog::DialogBase* dlg);
+    ~AlignAndDistribute() override = default;
+
+    void desktop_changed(SPDesktop* desktop);
+    void tool_changed(SPDesktop* desktop); // Need to show different widgets for node vs. other tools.
+    void tool_changed_callback(SPDesktop* desktop, Inkscape::UI::Tools::ToolBase* ec);
+
+private:
+
+    // ********* Widgets ********** //
+
+    Gtk::Box* align_and_distribute_box    = nullptr;
+    Gtk::Box* align_and_distribute_object = nullptr; // Hidden when node tool active.
+    Gtk::Box* align_and_distribute_node   = nullptr; // Visible when node tool active.
+
+    // Align
+    Gtk::ToggleButton* align_move_as_group      = nullptr;
+    Gtk::ComboBox*     align_relative_object    = nullptr;
+    Gtk::ComboBox*     align_relative_node      = nullptr;
+
+    // Remove overlap
+    Gtk::Button*       remove_overlap_button  = nullptr;
+    Gtk::SpinButton*   remove_overlap_hgap    = nullptr;
+    Gtk::SpinButton*   remove_overlap_vgap    = nullptr;
+
+
+    // ********* Signal handlers ********** //
+
+    void on_align_as_group_clicked();
+    void on_align_relative_object_changed();
+    void on_align_relative_node_changed();
+
+    bool on_align_button_press_event(GdkEventButton* button_event, const std::string& align_to);
+    bool on_remove_overlap_button_press_event(GdkEventButton* button_event);
+    bool on_align_node_button_press_event(GdkEventButton* button_event, const std::string& align_to);
+
+    sigc::connection tool_connection;
+    Inkscape::PrefObserver _icon_sizes_changed;
+};
+
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INKSCAPE_UI_WIDGET_ALIGN_AND_DISTRIBUTE_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 :