[smuxi: 8/15] [Common] Add an onError callback to IconCache

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit 952b32b0394a7cc3323c10556391a9393428b661
Author: Carlos Martín Nieto <cmn dwim me>
Date:   Sat Jan 31 19:08:57 2015 +0100

    [Common] Add an onError callback to IconCache
    
    This callback will be used when something goes wrong, such that the
    requester can know when to switch to an error pixbuf.

 src/Common/IconCache.cs                            |    7 ++++++-
 src/Frontend-GNOME/Views/Chats/ProtocolChatView.cs |    2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/src/Common/IconCache.cs b/src/Common/IconCache.cs
index 48e71d0..dddc077 100644
--- a/src/Common/IconCache.cs
+++ b/src/Common/IconCache.cs
@@ -86,10 +86,12 @@ namespace Smuxi.Common
         /// <param name="iconName">Name of the icon, including extension</param>
         /// <param name="websiteUrl">The url from which to download the icon</param>
         /// <param name="onSuccess">Function to call after downloading the icon</param>
+        /// <param name="onError">Function to call if an error happens (optinal)</param>
         /// <remarks>
         /// This method is thread safe
         /// </remarks>
-        public void DownloadIcon(string protocol, string iconName, string websiteUrl, Action<string> 
onSuccess)
+        public void DownloadIcon(string protocol, string iconName, string websiteUrl,
+            Action<string> onSuccess, Action<Exception> onError)
         {
             ThreadPool.QueueUserWorkItem(delegate {
                 try {
@@ -108,6 +110,9 @@ namespace Smuxi.Common
 #if LOG4NET
                     f_Logger.Error("DownloadIcon(): Exception", ex);
 #endif
+                    if (onError != null) {
+                        onError(ex);
+                    }
                 }
             });
         }
diff --git a/src/Frontend-GNOME/Views/Chats/ProtocolChatView.cs 
b/src/Frontend-GNOME/Views/Chats/ProtocolChatView.cs
index fd38017..9f9f558 100644
--- a/src/Frontend-GNOME/Views/Chats/ProtocolChatView.cs
+++ b/src/Frontend-GNOME/Views/Chats/ProtocolChatView.cs
@@ -244,7 +244,7 @@ namespace Smuxi.Frontend.Gnome
                     }
                 }
                 iconCache.Proxy = proxy;
-                iconCache.DownloadIcon(protocol, iconName, websiteUrl, UpdateServerIcon);
+                iconCache.DownloadIcon(protocol, iconName, websiteUrl, UpdateServerIcon, null);
             }
         }