From d5f2ce27f7e774607bdb513089014474a1479947 Mon Sep 17 00:00:00 2001
From: caremoli <caremoli>
Date: Tue, 30 Nov 2010 16:29:34 +0000
Subject: [PATCH] CCAR: small optimization for selection of large number of
 objects in the object browser Qt TreeView is not very fast when looping on
 select of modelindex It is faster to build a QItemSelection and make a single
 selection with this object It is sensible for number of objects greater than
 1000

---
 src/ObjBrowser/OB_Browser.cxx | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/ObjBrowser/OB_Browser.cxx b/src/ObjBrowser/OB_Browser.cxx
index e0e649a4d..b8c30eb3c 100755
--- a/src/ObjBrowser/OB_Browser.cxx
+++ b/src/ObjBrowser/OB_Browser.cxx
@@ -415,12 +415,18 @@ void OB_Browser::select( const QModelIndexList& indexes, const bool on, const bo
   myView->blockSignals( true );
 
   QModelIndex idx;
-  bool first = true;
 
   if ( !indexes.isEmpty() ) {
+    QItemSelection mysel;
     foreach( idx, indexes ) {
-      select( idx, on, first ? keepSelection : true );
-      first = false;
+      mysel.select(idx,idx);
+    }
+    if ( myView->selectionModel() ) {
+      QItemSelectionModel::SelectionFlags f = on ? QItemSelectionModel::Select : QItemSelectionModel::Deselect;
+      f = f | QItemSelectionModel::Rows;
+      if ( !keepSelection )
+        f = f | QItemSelectionModel::Clear;
+      myView->selectionModel()->select( mysel, f );
     }
   }
   else if ( !keepSelection ) {
-- 
2.39.2