[gnome-boxes] App: Add call_when_ready

[Alexander Larsson <alexl src gnome org>]

commit 7ce3c4e5fcb844473eafaf65d851737a2a4a02e1
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Jan 25 15:34:42 2013 +0100

    App: Add call_when_ready
    
    This makes it easy to queue calls until the app is in the ready
    state.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=692306

 src/app.vala |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/src/app.vala b/src/app.vala
index 437b1ca..fa869cb 100644
--- a/src/app.vala
+++ b/src/app.vala
@@ -65,6 +65,7 @@ private class Boxes.App: Boxes.UI {
     public Collection collection;
     public CollectionFilter filter;
 
+    private bool is_ready;
     public signal void ready (bool first_time);
     public signal void item_selected (CollectionItem item);
     private Boxes.Application application;
@@ -159,6 +160,7 @@ private class Boxes.App: Boxes.UI {
         });
         setup_sources.begin ((obj, result) => {
             setup_sources.end (result);
+            is_ready = true;
             var no_items = collection.items.length == 0;
             ready (no_items);
         });
@@ -167,6 +169,15 @@ private class Boxes.App: Boxes.UI {
         check_module_kvm_loaded.begin ();
     }
 
+    public delegate void CallReadyFunc (bool first_time);
+    public void call_when_ready (CallReadyFunc func) {
+        if (is_ready)
+            func (false);
+        ready.connect ((first_time) => {
+            func (first_time);
+        });
+    }
+
     public void activate () {
         window.present ();
     }