[banshee] Improve search responsiveness on large libraries

[Gabriel Burt <gburt src gnome org>]

commit fb3c382cbfa943f4dcced1994d46040a9be7e971
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Tue Mar 2 10:37:20 2010 -0800

    Improve search responsiveness on large libraries
    
    If the library is sufficiently large, add a longer delay before
    initiating the search so the user can type the whole query out, instead
    of it initiating the search after each character, and the UI becoming
    unresponsive (bgo#540835).  The exact thresholds for the longer delay
    are the library has > 20k items or the current, filtered item count is >
    10k items.

 src/Clients/Nereid/Nereid/PlayerInterface.cs       |    5 +++++
 .../Banshee.Widgets/Banshee.Widgets/SearchEntry.cs |    5 ++++-
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/src/Clients/Nereid/Nereid/PlayerInterface.cs b/src/Clients/Nereid/Nereid/PlayerInterface.cs
index 9f91357..22cfced 100644
--- a/src/Clients/Nereid/Nereid/PlayerInterface.cs
+++ b/src/Clients/Nereid/Nereid/PlayerInterface.cs
@@ -606,6 +606,11 @@ namespace Nereid
             }
 
             status_label.Text = source.GetStatusText ();
+
+            // We need a bit longer delay between query character typed to search initiated
+            // when the library is sufficiently big; see bgo #540835
+            bool long_delay = source.FilteredCount > 10000 || (source.Parent ?? source).Count > 20000;
+            view_container.SearchEntry.ChangeTimeoutMs = long_delay ? (uint)250 : (uint)25;
         }
 
 #endregion
diff --git a/src/Core/Banshee.Widgets/Banshee.Widgets/SearchEntry.cs b/src/Core/Banshee.Widgets/Banshee.Widgets/SearchEntry.cs
index 11fa899..fc388cf 100644
--- a/src/Core/Banshee.Widgets/Banshee.Widgets/SearchEntry.cs
+++ b/src/Core/Banshee.Widgets/Banshee.Widgets/SearchEntry.cs
@@ -65,12 +65,15 @@ namespace Banshee.Widgets
             remove { filter_changed -= value; }
         }
 
+        public uint ChangeTimeoutMs { get; set; }
+
         public Menu Menu {
             get { return menu; }
         }
 
         public SearchEntry()
         {
+            ChangeTimeoutMs = 25;
             AppPaintable = true;
 
             BuildWidget();
@@ -185,7 +188,7 @@ namespace Banshee.Widgets
             }
 
             if (Ready)
-                changed_timeout_id = GLib.Timeout.Add(25, OnChangedTimeout);
+                changed_timeout_id = GLib.Timeout.Add(ChangeTimeoutMs, OnChangedTimeout);
         }
 
         private bool OnChangedTimeout()