[recipes] details-page: allow running timer only when time is above 0

[Matthias Clasen <matthiasc src gnome org>]

commit 6cb32bde144c84dbddb0aaf5fa8225d9dd34e74c
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Mon Dec 12 15:54:58 2016 +0530

    details-page: allow running timer only when time is above 0
    
    https://bugzilla.gnome.org/show_bug.cgi?id=775974

 src/gr-details-page.c  |   24 ++++++++++++++++++++++++
 src/gr-details-page.ui |    3 ++-
 2 files changed, 26 insertions(+), 1 deletions(-)
---
diff --git a/src/gr-details-page.c b/src/gr-details-page.c
index 89553c0..6c20cb9 100644
--- a/src/gr-details-page.c
+++ b/src/gr-details-page.c
@@ -128,6 +128,7 @@ struct _GrDetailsPage
         GtkWidget *timer_stack;
         GtkWidget *timer_popover;
         GtkWidget *time_spin;
+        GtkWidget *start_button;
         GtkWidget *favorite_button;
         GtkWidget *duration_stack;
         GtkWidget *remaining_time_label;
@@ -485,6 +486,20 @@ details_page_finalize (GObject *object)
         G_OBJECT_CLASS (gr_details_page_parent_class)->finalize (object);
 }
 
+static gboolean
+gdouble_to_boolean (GBinding     *binding,
+                    const GValue *from_value,
+                    GValue       *to_value,
+                    gpointer      user_data)
+{
+  if (g_value_get_double (from_value))
+    g_value_set_boolean (to_value, TRUE);
+  else
+    g_value_set_boolean (to_value, FALSE);
+
+  return TRUE;
+}
+
 static void
 gr_details_page_init (GrDetailsPage *page)
 {
@@ -492,6 +507,14 @@ gr_details_page_init (GrDetailsPage *page)
         gtk_widget_init_template (GTK_WIDGET (page));
         connect_store_signals (page);
         page->cooking = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, cooking_data_free);
+
+        g_object_bind_property_full (page->time_spin, "value",
+                                     page->start_button, "sensitive",
+                                     0,
+                                     gdouble_to_boolean,
+                                     NULL,
+                                     NULL,
+                                     NULL);
 }
 
 static void
@@ -522,6 +545,7 @@ gr_details_page_class_init (GrDetailsPageClass *klass)
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, timer_stack);
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, timer_popover);
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, time_spin);
+        gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, start_button);
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, favorite_button);
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, duration_stack);
         gtk_widget_class_bind_template_child (widget_class, GrDetailsPage, remaining_time_label);
diff --git a/src/gr-details-page.ui b/src/gr-details-page.ui
index c4e0afc..5c4d832 100644
--- a/src/gr-details-page.ui
+++ b/src/gr-details-page.ui
@@ -456,11 +456,12 @@ followed</property>
               </object>
             </child>
             <child>
-              <object class="GtkButton">
+              <object class="GtkButton" id="start_button">
                 <property name="visible">1</property>
                 <property name="label" translatable="yes">Start</property>
                 <property name="halign">end</property>
                 <property name="valign">end</property>
+                <property name="sensitive">False</property>
                 <signal name="clicked" handler="start_or_stop_timer" swapped="yes"/>
               </object>
             </child>