[recipes] exporter: set export button sensitivity conditionally

[Matthias Clasen <matthiasc src gnome org>]

commit 87988786a5bcff732cba62ccf6fc043115e57754
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Tue Jan 17 07:36:39 2017 +0530

    exporter: set export button sensitivity conditionally
    
    When no recipe is selected for exporting, there is no
    need to allow the user to Export the recipes.
    
    So let the Export button be sensitive only if at least
    one recipe is marked for export.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777299

 src/gr-recipe-exporter.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/src/gr-recipe-exporter.c b/src/gr-recipe-exporter.c
index 9fd9e68..474fe7b 100644
--- a/src/gr-recipe-exporter.c
+++ b/src/gr-recipe-exporter.c
@@ -41,6 +41,7 @@ struct _GrRecipeExporter
         GObject parent_instance;
 
         GList *recipes;
+        GtkWidget *button_now;
         GtkWindow *window;
 
 #ifdef ENABLE_AUTOAR
@@ -456,6 +457,17 @@ update_heading (GrRecipeExporter *exporter)
 }
 
 static void
+update_export_button (GrRecipeExporter *exporter)
+{
+  gboolean empty = exporter->recipes == NULL;
+
+  if (empty)
+    gtk_widget_set_sensitive (exporter->button_now, FALSE);
+  else
+    gtk_widget_set_sensitive (exporter->button_now, TRUE);
+}
+
+static void
 row_activated (GtkListBox *list,
                GtkListBoxRow *row,
                GrRecipeExporter *exporter)
@@ -477,6 +489,7 @@ row_activated (GtkListBox *list,
         }
 
         update_heading (exporter);
+        update_export_button (exporter);
 }
 
 static void
@@ -566,6 +579,8 @@ show_export_dialog (GrRecipeExporter *exporter)
 
         builder = gtk_builder_new_from_resource ("/org/gnome/Recipes/recipe-export-dialog.ui");
         dialog = GTK_WIDGET (gtk_builder_get_object (builder, "dialog"));
+        exporter->button_now = GTK_WIDGET (gtk_builder_get_object (builder, "button_now"));
+
         gtk_window_set_transient_for (GTK_WINDOW (dialog), GTK_WINDOW (exporter->window));
 
         list = GTK_WIDGET (gtk_builder_get_object (builder, "recipe_list"));