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diff --git a/src/ui/dialog/floating-behavior.h b/src/ui/dialog/floating-behavior.h
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+++ b/src/ui/dialog/floating-behavior.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief A floating dialog implementation.
+ */
+/* Author:
+ *   Gustav Broberg <broberg@kth.se>
+ *
+ * Copyright (C) 2007 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+
+#ifndef INKSCAPE_UI_DIALOG_FLOATING_BEHAVIOR_H
+#define INKSCAPE_UI_DIALOG_FLOATING_BEHAVIOR_H
+
+#include <glibmm/property.h>
+#include "behavior.h"
+
+namespace Gtk {
+class Dialog;
+}
+
+namespace Inkscape {
+namespace UI {
+namespace Dialog {
+namespace Behavior {
+
+class FloatingBehavior : public Behavior {
+
+public:
+    static Behavior *create(Dialog &dialog);
+
+    ~FloatingBehavior() override;
+
+    /** Gtk::Dialog methods */
+    operator Gtk::Widget &() override;
+    GtkWidget *gobj() override;
+    void present() override;
+    Gtk::Box *get_vbox() override;
+    void show() override;
+    void hide() override;
+    void show_all_children() override;
+    void resize(int width, int height) override;
+    void move(int x, int y) override;
+    void set_position(Gtk::WindowPosition) override;
+    void set_size_request(int width, int height) override;
+    void size_request(Gtk::Requisition &requisition) override;
+    void get_position(int &x, int &y) override;
+    void get_size(int& width, int &height) override;
+    void set_title(Glib::ustring title) override;
+    void set_sensitive(bool sensitive) override;
+
+    /** Gtk::Dialog signal proxies */
+    Glib::SignalProxy0<void> signal_show() override;
+    Glib::SignalProxy0<void> signal_hide() override;
+    Glib::SignalProxy1<bool, GdkEventAny *> signal_delete_event() override;
+
+    /** Custom signal handlers */
+    void onHideF12() override;
+    void onShowF12() override;
+    void onDesktopActivated(SPDesktop *desktop) override;
+    void onShutdown() override;
+
+private:
+    FloatingBehavior(Dialog& dialog);
+
+    Gtk::Dialog *_d;   //< the actual dialog
+
+    Glib::PropertyProxy_ReadOnly<bool> _dialog_active;  //< Variable proxy to track whether the dialog is the active window
+    float _trans_focus;  //< The percentage opacity when the dialog is focused
+    float _trans_blur;   //< The percentage opactiy when the dialog is not focused
+    int _trans_time;     //< The amount of time (in ms) for the dialog to change it's transparency
+};
+
+} // namespace Behavior
+} // namespace Dialog
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INKSCAPE_UI_DIALOG_FLOATING_BEHAVIOR_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 :