[gnome-games] collections-main-page: Support selection mode

[Alexander Mikhaylenko <alexm src gnome org>]

commit 410d8552eb0efb29b97789fdb99b64149fd96fc2
Author: Neville <nevilleantony98 gmail com>
Date:   Fri Aug 21 16:17:19 2020 +0530

    collections-main-page: Support selection mode

 src/ui/collections-main-page.vala | 69 +++++++++++++++++++++++++++++++++++----
 1 file changed, 62 insertions(+), 7 deletions(-)
---
diff --git a/src/ui/collections-main-page.vala b/src/ui/collections-main-page.vala
index cb43e71ba..29bbd4820 100644
--- a/src/ui/collections-main-page.vala
+++ b/src/ui/collections-main-page.vala
@@ -3,9 +3,19 @@
 [GtkTemplate (ui = "/org/gnome/Games/ui/collections-main-page.ui")]
 private class Games.CollectionsMainPage : Gtk.Bin {
        public signal void collection_activated (Collection collection);
+       public signal void selected_items_changed ();
        public signal void gamepad_accepted ();
 
+       [GtkChild]
+       private Gtk.FlowBox flow_box;
+       [GtkChild]
+       private GamepadBrowse gamepad_browse;
+       [GtkChild]
+       private Gtk.ScrolledWindow scrolled_window;
+
        private Binding window_active_binding;
+       private GenericSet<CollectionIconView> selected_collections;
+
        private bool _is_active;
        public bool is_active {
                get { return _is_active; }
@@ -30,12 +40,7 @@ private class Games.CollectionsMainPage : Gtk.Bin {
                }
        }
 
-       [GtkChild]
-       private Gtk.FlowBox flow_box;
-       [GtkChild]
-       private GamepadBrowse gamepad_browse;
-       [GtkChild]
-       private Gtk.ScrolledWindow scrolled_window;
+       public bool is_selection_mode { get; set; }
 
        static construct {
                set_css_name ("gamescollectionsmainpage");
@@ -43,6 +48,8 @@ private class Games.CollectionsMainPage : Gtk.Bin {
 
        construct {
                flow_box.max_children_per_line = uint.MAX;
+
+               selected_collections = new GenericSet<CollectionIconView> (CollectionIconView.hash, 
CollectionIconView.equal);
        }
 
        public bool has_collection_selected () {
@@ -69,7 +76,49 @@ private class Games.CollectionsMainPage : Gtk.Bin {
        }
 
        private Gtk.Widget add_collection (Object item) {
-               return new CollectionIconView (item as Collection);
+               var collection_icon_view = new CollectionIconView (item as Collection);
+               if (item is UserCollection) {
+                       bind_property ("is-selection-mode", collection_icon_view, "is-selection-mode", 
BindingFlags.DEFAULT);
+                       collection_icon_view.notify["checked"].connect (() => {
+                               assert (collection_icon_view.collection is UserCollection);
+
+                               if (collection_icon_view.checked)
+                                       selected_collections.add (collection_icon_view);
+                               else
+                                       selected_collections.remove (collection_icon_view);
+
+                               selected_items_changed ();
+                       });
+               }
+               else
+                       bind_property ("is-selection-mode", collection_icon_view, "sensitive", 
BindingFlags.INVERT_BOOLEAN);
+
+               return collection_icon_view;
+       }
+
+       public void select_none () {
+               foreach (var icon_view in selected_collections.get_values ())
+                       icon_view.checked = false;
+
+               selected_collections.remove_all ();
+               selected_items_changed ();
+       }
+
+       public void select_all () {
+               foreach (var child in flow_box.get_children ()) {
+                       var collection_icon_view = child as CollectionIconView;
+                       collection_icon_view.checked = collection_icon_view.collection is UserCollection;
+               }
+
+               selected_items_changed ();
+       }
+
+       public UserCollection[] get_selected_collections () {
+               UserCollection[] collections = {};
+               foreach (var collection_icon_view in selected_collections.get_values ())
+                       collections += collection_icon_view.collection as UserCollection;
+
+               return collections;
        }
 
        public bool gamepad_button_press_event (Manette.Event event) {
@@ -164,6 +213,12 @@ private class Games.CollectionsMainPage : Gtk.Bin {
        [GtkCallback]
        private void on_child_activated (Gtk.FlowBoxChild child) {
                var collection_icon_view = child as CollectionIconView;
+
+               if (is_selection_mode) {
+                       collection_icon_view.checked = !collection_icon_view.checked;
+                       return;
+               }
+
                if (collection_icon_view != null)
                        collection_activated (collection_icon_view.collection);
        }