[california/wip/725768-colors] First pass at adding colors to California

[Jim Nelson <jnelson src gnome org>]

commit e356cf1d14e47dd7684ddb3227cbafe25f75dd2c
Author: Jim Nelson <jim yorba org>
Date:   Tue Mar 11 17:44:34 2014 -0700

    First pass at adding colors to California

 src/backing/backing-calendar-source.vala         |    7 +++++
 src/backing/eds/backing-eds-calendar-source.vala |   31 ++++++++++++++++++++++
 src/backing/eds/backing-eds-store.vala           |    5 +++-
 src/view/month/month-cell.vala                   |    3 +-
 4 files changed, 44 insertions(+), 2 deletions(-)
---
diff --git a/src/backing/backing-calendar-source.vala b/src/backing/backing-calendar-source.vala
index 67ddd64..c38eb89 100644
--- a/src/backing/backing-calendar-source.vala
+++ b/src/backing/backing-calendar-source.vala
@@ -14,6 +14,13 @@ namespace California.Backing {
  */
 
 public abstract class CalendarSource : Source {
+    /**
+     * The suggested color to use when displaying the { link CalendarSource} or information
+     * about or from it.
+     */
+    public Gdk.RGBA color { get; protected set;
+        default = Gdk.RGBA() { red = 0.0, green = 0.0, blue = 0.0, alpha = 1.0 }; }
+    
     protected CalendarSource(string title) {
         base (title);
     }
diff --git a/src/backing/eds/backing-eds-calendar-source.vala 
b/src/backing/eds/backing-eds-calendar-source.vala
index d4e6ecc..0a29375 100644
--- a/src/backing/eds/backing-eds-calendar-source.vala
+++ b/src/backing/eds/backing-eds-calendar-source.vala
@@ -20,6 +20,37 @@ internal class EdsCalendarSource : CalendarSource {
         
         this.eds_source = eds_source;
         this.eds_calendar = eds_calendar;
+        
+        // initial color property and monitor for future changes
+        update_calendar_color();
+        eds_calendar.notify["color"].connect(update_calendar_color);
+    }
+    
+    ~EdsCalendarSource() {
+        eds_calendar.notify["color"].disconnect(update_calendar_color);
+    }
+    
+    private void update_calendar_color() {
+        Gdk.Color rgb;
+        if (!Gdk.Color.parse(eds_calendar.color, out rgb)) {
+            debug("Unable to parse calendar color for %s: %s", to_string(), eds_calendar.color.to_string());
+            
+            return;
+        }
+        
+        Gdk.RGBA rgba = {
+            red: conv(rgb.red),
+            green: conv(rgb.green),
+            blue: conv(rgb.blue),
+            alpha: 1.0
+        };
+        
+        color = rgba;
+    }
+    
+    // compiler error if this calculation is done inline when initializing struct
+    private inline double conv(uint16 value) {
+        return (double) value / (double) uint16.MAX;
     }
     
     // Invoked by EdsStore prior to making it available outside of unit
diff --git a/src/backing/eds/backing-eds-store.vala b/src/backing/eds/backing-eds-store.vala
index 79c7173..49b9516 100644
--- a/src/backing/eds/backing-eds-store.vala
+++ b/src/backing/eds/backing-eds-store.vala
@@ -52,10 +52,13 @@ internal class EdsStore : Store {
     }
     
     private async void add_eds_source_async(E.Source eds_source) {
+        if (!eds_source.enabled)
+            return;
+        
         // only interested in calendars for now
         E.SourceCalendar? eds_calendar =
             eds_source.get_extension(E.SOURCE_EXTENSION_CALENDAR) as E.SourceCalendar;
-        if (eds_calendar == null)
+        if (eds_calendar == null || !eds_calendar.selected)
             return;
         
         EdsCalendarSource calendar = new EdsCalendarSource(eds_source, eds_calendar);
diff --git a/src/view/month/month-cell.vala b/src/view/month/month-cell.vala
index ff7e0d9..71bb9c8 100644
--- a/src/view/month/month-cell.vala
+++ b/src/view/month/month-cell.vala
@@ -252,7 +252,8 @@ public class Cell : Gtk.EventBox {
                 text = "%s %s".printf(local_start.to_pretty_time_string(PRETTY_TIME_FLAGS), event.summary);
             }
             
-            Pango.Layout layout = draw_line_of_text(ctx, line_number, RGBA_DAY_OF_MONTH, text);
+            Pango.Layout layout = draw_line_of_text(ctx, line_number, event.calendar_source.color,
+                text);
             line_to_event.set(line_number++, event);
             event.set_data<string?>(KEY_TOOLTIP, layout.is_ellipsized() ? text : null);
         }