[tepl] App: activate: just present existing main window if already created

[Sébastien Wilmet <swilmet src gnome org>]

commit 9002a3cfca427fbdc78fb25a391e43b9caf34c3f
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Oct 14 18:12:44 2017 +0200

    App: activate: just present existing main window if already created

 tepl/tepl-application.c |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)
---
diff --git a/tepl/tepl-application.c b/tepl/tepl-application.c
index a1a3bce..ae43000 100644
--- a/tepl/tepl-application.c
+++ b/tepl/tepl-application.c
@@ -457,14 +457,27 @@ static void
 activate_cb (GApplication    *g_app,
             TeplApplication *tepl_app)
 {
-       TeplAbstractFactory *factory;
        GtkApplicationWindow *main_window;
 
        g_application_hold (g_app);
 
-       factory = tepl_abstract_factory_get_singleton ();
-       main_window = tepl_abstract_factory_create_main_window (factory, tepl_app->priv->gtk_app);
-       gtk_widget_show (GTK_WIDGET (main_window));
+       main_window = tepl_application_get_active_main_window (tepl_app);
+
+       if (main_window == NULL)
+       {
+               TeplAbstractFactory *factory;
+
+               factory = tepl_abstract_factory_get_singleton ();
+               main_window = tepl_abstract_factory_create_main_window (factory, tepl_app->priv->gtk_app);
+               gtk_widget_show (GTK_WIDGET (main_window));
+       }
+       else
+       {
+               GtkWindow *active_window;
+
+               active_window = gtk_application_get_active_window (tepl_app->priv->gtk_app);
+               gtk_window_present (active_window);
+       }
 
        g_application_release (g_app);
 }
@@ -475,7 +488,10 @@ activate_cb (GApplication    *g_app,
  *
  * Connects a generic function handler for the #GApplication::activate signal.
  *
- * It creates a main window with tepl_abstract_factory_create_main_window().
+ * If no main windows exist, it creates one with
+ * tepl_abstract_factory_create_main_window(). If a main window already exists,
+ * it calls gtk_window_present() on the most recently focused window of the
+ * application.
  *
  * Since: 3.2
  */