--- src/wingpanel/src/PanelWindow.vala	2016-10-21 23:51:49.434036000 +0900
+++ src/wingpanel/src/PanelWindow.vala	2016-10-22 00:21:00.991151961 +0900
@@ -86,7 +86,6 @@
     private void on_realize () {
         update_panel_dimensions ();
 
-        Services.BackgroundManager.initialize (this.monitor_number, panel_height);
 
         timeout = Timeout.add (100 / panel_height, animation_step);
     }
@@ -152,7 +152,6 @@
 
     public void set_expanded (bool expanded) {
         if (expand && !this.expanded) {
-            Services.BackgroundManager.get_default ().remember_window ();
 
             this.expanded = true;
 
@@ -163,7 +163,6 @@
 
             this.set_size_request (monitor_width, monitor_height);
         } else if (!expand) {
-            Services.BackgroundManager.get_default ().restore_window ();
 
             this.expanded = false;
 
--- src/wingpanel/src/Widgets/Panel.vala	2018-06-04 19:55:35.553769970 +0900
+++ src/wingpanel/src/Widgets/Panel.vala	2018-06-04 21:39:40.293996810 +0900
@@ -25,7 +25,6 @@
     private MenuBar center_menubar;
 
     private Gtk.StyleContext style_context;
-    private Gtk.CssProvider? style_provider = null;
 
     public Panel (Services.PopoverManager popover_manager) {
         Object (popover_manager : popover_manager);
@@ -64,43 +63,6 @@
 
         style_context = this.get_style_context ();
 
-        Services.BackgroundManager.get_default ().background_state_changed.connect (update_background);
-    }
-
-    public override bool button_press_event (Gdk.EventButton event) {
-        if (event.button != Gdk.BUTTON_PRIMARY) {
-            return Gdk.EVENT_PROPAGATE;
-        }
-
-        var window = get_window ();
-        if (window == null) {
-            return Gdk.EVENT_PROPAGATE;
-        }
-
-        // Grabbing with touchscreen on X does not work unfortunately
-        if (event.device.get_source () == Gdk.InputSource.TOUCHSCREEN) {
-            return Gdk.EVENT_PROPAGATE;
-        }
-
-        uint32 time = event.time;
-        
-#if HAS_GTK320
-        window.get_display ().get_default_seat ().ungrab ();
-#else
-        window.get_display ().pointer_ungrab (time);
-#endif
-
-        Gdk.ModifierType state;
-        event.get_state (out state);
-
-        popover_manager.close ();
-
-        var scale_factor = this.get_scale_factor ();
-        var x = (int)event.x_root * scale_factor;
-        var y = (int)event.y_root * scale_factor;
-
-        var background_manager = Services.BackgroundManager.get_default ();
-        return background_manager.begin_grab_focused_window (x, y, (int)event.button, time, state);
     }
 
     public void cycle (bool forward) {
@@ -263,56 +229,4 @@
             }
         }
     }
-
-    private void update_background (Services.BackgroundState state, uint animation_duration) {
-        if (style_provider == null) {
-            style_provider = new Gtk.CssProvider ();
-            style_context.add_provider (style_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
-        }
-
-        string css = """
-            .panel {
-                transition: all %ums ease-in-out;
-            }
-        """.printf (animation_duration);
-
-        try {
-            style_provider.load_from_data (css, css.length);
-        } catch (Error e) {
-            warning ("Parsing own style configuration failed: %s", e.message);
-        }
-
-        switch (state) {
-            case Services.BackgroundState.DARK :
-                style_context.add_class ("color-light");
-                style_context.remove_class ("color-dark");
-                style_context.remove_class ("maximized");
-                style_context.remove_class ("translucent");
-                break;
-            case Services.BackgroundState.LIGHT:
-                style_context.add_class ("color-dark");
-                style_context.remove_class ("color-light");
-                style_context.remove_class ("maximized");
-                style_context.remove_class ("translucent");
-                break;
-            case Services.BackgroundState.MAXIMIZED:
-                style_context.add_class ("maximized");
-                style_context.remove_class ("color-light");
-                style_context.remove_class ("color-dark");
-                style_context.remove_class ("translucent");
-                break;
-            case Services.BackgroundState.TRANSLUCENT_DARK:
-                style_context.add_class ("translucent");
-                style_context.add_class ("color-light");
-                style_context.remove_class ("color-dark");
-                style_context.remove_class ("maximized");
-                break;
-            case Services.BackgroundState.TRANSLUCENT_LIGHT:
-                style_context.add_class ("translucent");
-                style_context.add_class ("color-dark");
-                style_context.remove_class ("color-light");
-                style_context.remove_class ("maximized");
-                break;
-        }
-    }
 }
--- src/wingpanel/src/CMakeLists.txt	2017-10-13 03:28:23.119421691 +0900
+++ src/wingpanel/src/CMakeLists.txt	2017-10-13 03:30:12.838158479 +0900
@@ -10,7 +10,6 @@
   Services/IndicatorSorter.vala
   Services/PopoverManager.vala
   Services/Settings.vala
-  Services/BackgroundManager.vala
 )
 
 vala_precompile (CLIENT_VALA_C ${CMAKE_PROJECT_NAME}