[gnome-boxes/wip/feborges/flowbox: 11/13] collection: Insert items sorted

[Felipe Borges <felipeborges src gnome org>]

commit 10bf17c16acf617570fce746f8a7c61fcd84df73
Author: Felipe Borges <felipeborges gnome org>
Date:   Wed Dec 20 17:54:50 2017 +0100

    collection: Insert items sorted
    
    This way we will be able to get rid of GtkListBox.sort_func and
    do the sorting at the model side when ListView will be binded to
    Collection directly.

 src/collection.vala |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/collection.vala b/src/collection.vala
index 91cb74c..078be0e 100644
--- a/src/collection.vala
+++ b/src/collection.vala
@@ -50,7 +50,13 @@ private class Boxes.Collection: GLib.Object {
     }
 
     public void add_item (CollectionItem item) {
-        items.append (item);
+        items.insert_sorted (item, (item1, item2) => {
+            if (item1 == null || item2 == null)
+                return 0;
+
+            return (item1 as CollectionItem).compare (item2 as CollectionItem);
+        });
+
         item_added (item);
     }