[gnome-calendar/wip/pandusonu/week-view: 21/21] week-view: center grid on date change

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit b340bd02a3006e91d1e8591a92af2cc87c7b48bf
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Dec 8 18:54:01 2016 -0200

    week-view: center grid on date change

 src/views/gcal-week-view.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/src/views/gcal-week-view.c b/src/views/gcal-week-view.c
index 0f2fb52..00e6f9d 100644
--- a/src/views/gcal-week-view.c
+++ b/src/views/gcal-week-view.c
@@ -49,6 +49,7 @@ struct _GcalWeekView
 
   GtkWidget      *header;
   GtkWidget      *hours_bar;
+  GtkWidget      *scrolled_window;
   GtkWidget      *week_grid;
 
   /*
@@ -130,6 +131,25 @@ on_event_activated (GcalWeekView *self,
   g_signal_emit (self, signals[EVENT_ACTIVATED], 0, widget);
 }
 
+/* Auxiliary methods */
+static void
+update_grid_scroll_position (GcalWeekView *self)
+{
+  g_autoptr(GDateTime) now;
+  GtkAdjustment *vadjustment;
+  gdouble minutes;
+  gdouble max, page;
+
+  now = g_date_time_new_now_local ();
+  vadjustment = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (self->scrolled_window));
+  minutes = g_date_time_get_hour (now) * 60 + g_date_time_get_minute (now);
+  page = gtk_adjustment_get_page_size (vadjustment);
+  max = gtk_adjustment_get_upper (vadjustment);
+
+  gtk_adjustment_set_value (vadjustment,
+                            max / MINUTES_PER_DAY * minutes - (page / 2.0));
+}
+
 /**
  * gcal_week_view_get_initial_date:
  *
@@ -431,6 +451,7 @@ gcal_week_view_class_init (GcalWeekViewClass *klass)
 
   gtk_widget_class_bind_template_child (widget_class, GcalWeekView, header);
   gtk_widget_class_bind_template_child (widget_class, GcalWeekView, hours_bar);
+  gtk_widget_class_bind_template_child (widget_class, GcalWeekView, scrolled_window);
   gtk_widget_class_bind_template_child (widget_class, GcalWeekView, week_grid);
 
   gtk_widget_class_bind_template_callback (widget_class, gcal_week_view_draw_hours);
@@ -495,6 +516,9 @@ gcal_week_view_set_property (GObject       *object,
     case PROP_DATE:
       g_clear_pointer (&self->date, g_free);
       self->date = g_value_dup_boxed (value);
+
+      update_grid_scroll_position (self);
+
       break;
 
     default: