Fix stuttery touch screen input

Due to a to high amount of changes which are written into the settings file the input became laggy.
Fixed by reducing the amount of values which are written into settings.

src/main.c

@@ -38,7 +38,7 @@ main (int   argc,
 	 * application windows, integration with the window manager/compositor, and
 	 * desktop features such as file opening and single-instance applications.
 	 */
-	app = picplanner_application_new ("de.zwarf.picplanner", G_APPLICATION_FLAGS_NONE);
+	app = picplanner_application_new ("de.zwarf.picplanner", G_APPLICATION_DEFAULT_FLAGS);
 
 	/*
 	 * Run the application. This function will block until the application

src/window/overview-page/overview-view.c

@@ -79,11 +79,87 @@ struct _PicplannerOverview
   PicplannerDrawLayer *pp_layer_milky_way_rise_set;
 
   GSettings           *settings;
+
+  gint                input_timeout_id;
+  gint                input_rebounce_timeout_id;
+  guint               input_count;
+  gboolean            input_new;
+  gboolean            input_currently;
+
 };
 
 
 G_DEFINE_TYPE (PicplannerOverview, picplanner_overview, GTK_TYPE_BOX)
+static gboolean
+input_rebounce_reset_signal (gpointer user_data)
+{
+  PicplannerOverview *overview = PICPLANNER_OVERVIEW (user_data);
+  overview->input_currently = FALSE;
+  g_source_remove (overview->input_rebounce_timeout_id);
+  return TRUE;
+}
 
+static gboolean
+input_timeout_signal (gpointer user_data)
+{
+  PicplannerOverview *overview = PICPLANNER_OVERVIEW (user_data);
+
+  if (overview->input_count == 0)
+    {
+      g_print("Change if\n");
+      overview->input_new = TRUE;
+      overview->input_currently = TRUE;
+      overview->input_rebounce_timeout_id = g_timeout_add (50,
+                                                           input_rebounce_reset_signal,
+                                                           overview);
+      g_settings_set_double (overview->settings,
+                             "longitude" ,
+                             shumate_location_get_longitude (SHUMATE_LOCATION(overview->viewport)));
+      g_settings_set_double (overview->settings,
+                             "latitude" ,
+                             shumate_location_get_latitude (SHUMATE_LOCATION(overview->viewport)));
+      g_source_remove (overview->input_timeout_id);
+    }
+  overview->input_count = 0;
+
+  return TRUE;
+}
+static void
+input_changed (GtkWidget *self,
+               gpointer user_data,
+               gpointer data_overview)
+{
+  (void) user_data;
+  PicplannerOverview *overview;
+  overview = PICPLANNER_OVERVIEW (data_overview);
+
+  if (!overview->input_currently)
+    {
+      if (!G_IS_SETTINGS(self))
+        {
+          if (overview->input_new)
+            {
+              overview->input_new = FALSE;
+              overview->input_timeout_id = g_timeout_add (200,
+                                                          input_timeout_signal,
+                                                          overview);
+
+            }
+          overview->input_count++;
+        }
+      else
+        {
+          overview->input_currently = TRUE;
+          g_print("Change Else\n");
+          shumate_location_set_location (SHUMATE_LOCATION (overview->viewport),
+                                         g_settings_get_double (overview->settings, "latitude"),
+                                         g_settings_get_double (overview->settings, "longitude"));
+          overview->input_rebounce_timeout_id = g_timeout_add (50,
+                                                           input_rebounce_reset_signal,
+                                                           overview);
+        }
+    }
+}
 
 void
 picplanner_overview_map_fullscreen (PicplannerOverview *overview,
@@ -635,13 +711,31 @@ picplanner_overview_init (PicplannerOverview *overview)
   /*
    * Make all the bindings between widget properties and g_settings.
    */
-  g_settings_bind (overview->settings, "longitude",
-                   overview->viewport, "longitude",
-                   G_SETTINGS_BIND_DEFAULT);
 
+  g_signal_connect (G_OBJECT (overview->viewport),
+                    "notify::longitude",
+                    G_CALLBACK (input_changed),
+                    overview);
+  g_signal_connect (G_OBJECT (overview->viewport),
+                    "notify::latitude",
+                    G_CALLBACK (input_changed),
+                    overview);
+  g_signal_connect (G_OBJECT (overview->settings),
+                    "changed::longitude",
+                    G_CALLBACK (input_changed),
+                    overview);
+  g_signal_connect (G_OBJECT (overview->settings),
+                    "changed::latitude",
+                    G_CALLBACK (input_changed),
+                    overview);
+
+
+
+  /*
   g_settings_bind (overview->settings, "latitude",
                    overview->viewport, "latitude",
                    G_SETTINGS_BIND_DEFAULT);
+  */
 
   g_settings_bind (overview->settings, "zoom-level",
                    overview->viewport, "zoom-level",
@@ -676,6 +770,15 @@ picplanner_overview_init (PicplannerOverview *overview)
                     "changed::map-unit-imperial",
                     G_CALLBACK (shumate_map_metric_imperial_scale),
                     overview);
+
+
+  /*
+   * Initialisation of values needed to detect when a user input ends
+   */
+  overview->input_new = true;
+  overview->input_currently = false;
+  overview->input_count = 0;
+  overview->input_timeout_id = 0;
 }
 
 static void