Add a ServiceWidget#refresh method

Useful to refresh the widget in certain scenarios, i.e. when the "Apply
changes" action is performed.#

library/cwm/src/lib/cwm/service_widget.rb

@@ -36,6 +36,10 @@ def contents
       @service_widget.content
     end
 
+    def refresh
+      @service_widget.refresh
+    end
+
     def handle(event)
       log.info "handling event #{event.inspect}"
       return unless event

library/systemd/src/lib/yast2/service_widget.rb

@@ -89,6 +89,12 @@ def content
       )
     end
 
+    def refresh
+      Yast::UI.ChangeWidget(Id(:service_widget_status), :Value, status)
+      Yast::UI.ChangeWidget(Id(:service_widget_action), :Items, action_items)
+      Yast::UI.ChangeWidget(Id(:service_widget_autostart), :Items, autostart_items)
+    end
+
     # handles event to dynamically react on user configuration.
     # For events that does not happen inside widget it is ignored.
     # @param event_id [Object] id of UI element that cause event

library/systemd/test/yast2/service_widget_test.rb

@@ -70,6 +70,30 @@
     end
   end
 
+  describe "#refresh" do
+    before do
+      allow(Yast::UI).to receive(:ChangeWidget).with(any_args)
+    end
+
+    it "updates the status" do
+      expect(Yast::UI).to receive(:ChangeWidget).with(Id(:service_widget_status), :Value, anything)
+
+      subject.refresh
+    end
+
+    it "updates available actions" do
+      expect(Yast::UI).to receive(:ChangeWidget).with(Id(:service_widget_action), :Items, anything)
+
+      subject.refresh
+    end
+
+    it "updates available options for start mode" do
+      expect(Yast::UI).to receive(:ChangeWidget).with(Id(:service_widget_autostart), :Items, anything)
+
+      subject.refresh
+    end
+  end
+
   describe "#store" do
     before do
       allow(Yast::UI).to receive(:QueryWidget)