[gnome-games] ui: Add DevelopersView widget

[Adrien Plazas <aplazas src gnome org>]

commit f843b9661ca2768ea039a68ac11f86ff0be0ecf8
Author: 1PunMan <saurabhsingh412 gmail com>
Date:   Wed Aug 1 23:16:12 2018 +0530

    ui: Add DevelopersView widget
    
    This widget will allow the display of games grouped by the developers
    available.

 src/meson.build             |  1 +
 src/ui/developers-view.vala | 50 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
---
diff --git a/src/meson.build b/src/meson.build
index e46f2f4c..62772da6 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -128,6 +128,7 @@ vala_sources = [
   'ui/collection-icon-view.vala',
   'ui/collection-header-bar.vala',
   'ui/developer-list-item.vala',
+  'ui/developers-view.vala',
   'ui/display-box.vala',
   'ui/display-header-bar.vala',
   'ui/dummy-display.vala',
diff --git a/src/ui/developers-view.vala b/src/ui/developers-view.vala
new file mode 100644
index 00000000..454d0109
--- /dev/null
+++ b/src/ui/developers-view.vala
@@ -0,0 +1,50 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+private class Games.DevelopersView : SidebarView {
+       private GenericSet<Developer> developers = new GenericSet<Developer> (Developer.hash, 
Developer.equal);
+       private ulong developer_changed_id;
+
+       private void invalidate_developer (Developer developer){
+               if (!developers.contains (developer)) {
+                       developers.add (developer);
+                       var developer_list_item = new DeveloperListItem (developer);
+                       list_box.add (developer_list_item);
+               }
+       }
+
+       protected override void game_added (Game game) {
+               var developer = game.get_developer ();
+
+               developer_changed_id = developer.changed.connect ((source) => {
+                       invalidate_developer (source);
+               });
+
+               // FIXME: Currently developers are fetched in sync and there is
+               // a need to check non GriloDeveloper objects, update this function
+               // if necessary.
+               if (!(developer is GriloDeveloper)) {
+                       if (developers.contains (developer))
+                               return;
+
+                       developers.add (developer);
+                       var listbox_item = new DeveloperListItem (developer);
+                       list_box.add (listbox_item);
+               }
+       }
+
+       protected override void invalidate (Gtk.ListBoxRow row_item) {
+               var row = row_item.get_child () as DeveloperListItem;
+               var developer = row.developer;
+               collection_view.filtering_developer = developer;
+       }
+
+       protected override int sort_rows (Gtk.ListBoxRow row1, Gtk.ListBoxRow row2) {
+               var item1 = row1.get_child () as DeveloperListItem;
+               var item2 = row2.get_child () as DeveloperListItem;
+
+               assert (item1 != null);
+               assert (item2 != null);
+
+               return item1.label.collate (item2.label);
+       }
+}