[gnome-games/wip/exalm/tnum: 23/24] collection-view: Show number of selected games in headerbar

[Alexander Mikhaylenko <alexm src gnome org>]

commit a2879adaf3ae94b183c7eb8366f3258a5d3e14c2
Author: Neville <nevilleantony98 gmail com>
Date:   Sat Aug 15 18:13:40 2020 +0530

    collection-view: Show number of selected games in headerbar
    
    shows "Selected n items" in selection mode headerbar which is handy to
    keep track of selected games.
    
    Fixes #302.
    
    Fixes #303

 data/ui/collection-view.ui  | 11 +++++++----
 src/ui/collection-view.vala | 24 +++++++++++++++---------
 2 files changed, 22 insertions(+), 13 deletions(-)
---
diff --git a/data/ui/collection-view.ui b/data/ui/collection-view.ui
index 0b82ea4e8..b54c94dad 100644
--- a/data/ui/collection-view.ui
+++ b/data/ui/collection-view.ui
@@ -368,10 +368,13 @@
                     <property name="visible">True</property>
                     <property name="spacing">6</property>
                     <child>
-                      <object class="GtkLabel">
+                      <object class="GtkLabel" id="selection_mode_label">
                         <property name="visible">True</property>
                         <property name="label" translatable="yes">Click on items to select them</property>
                         <property name="ellipsize">end</property>
+                        <attributes>
+                          <attribute name="font-features" value="tnum=1"/>
+                        </attributes>
                       </object>
                     </child>
                     <child>
@@ -437,7 +440,7 @@
                     <property name="visible">True</property>
                     <property name="is-selection-mode" bind-source="GamesCollectionView" 
bind-property="is-selection-mode"/>
                     <signal name="game-activated" handler="on_game_activated"/>
-                    <signal name="selected-items-changed" handler="update_selection_action_bar"/>
+                    <signal name="selected-items-changed" handler="on_selected_items_changed"/>
                   </object>
                   <packing>
                     <property name="name">games</property>
@@ -452,7 +455,7 @@
                     <property name="is-selection-mode" bind-source="GamesCollectionView" 
bind-property="is-selection-mode"/>
                     <signal name="game-activated" handler="on_game_activated"/>
                     <signal name="notify::is-subview-open" handler="update_selection_availability"/>
-                    <signal name="selected-items-changed" handler="update_selection_action_bar"/>
+                    <signal name="selected-items-changed" handler="on_selected_items_changed"/>
                   </object>
                   <packing>
                     <property name="name">platform</property>
@@ -467,7 +470,7 @@
                     <property name="is-selection-mode" bind-source="GamesCollectionView" 
bind-property="is-selection-mode"/>
                     <property name="is-search-mode" bind-source="GamesCollectionView" 
bind-property="search-mode" bind-flags="bidirectional"/>
                     <signal name="game-activated" handler="on_game_activated"/>
-                    <signal name="selected-items-changed" handler="update_selection_action_bar"/>
+                    <signal name="selected-items-changed" handler="on_selected_items_changed"/>
                     <signal name="notify::is-subpage-open" handler="update_bottom_bar"/>
                   </object>
                   <packing>
diff --git a/src/ui/collection-view.vala b/src/ui/collection-view.vala
index 8be154108..f91b615c0 100644
--- a/src/ui/collection-view.vala
+++ b/src/ui/collection-view.vala
@@ -56,6 +56,8 @@ private class Games.CollectionView : Gtk.Box, UiView {
        private Gtk.Popover rename_popover;
        [GtkChild]
        private Gtk.Label collection_rename_error_label;
+       [GtkChild]
+       private Gtk.Label selection_mode_label;
 
        private bool _is_view_active;
        public bool is_view_active {
@@ -345,7 +347,7 @@ private class Games.CollectionView : Gtk.Box, UiView {
                games_page.select_none ();
                collections_page.select_none ();
 
-               update_selection_action_bar ();
+               on_selected_items_changed ();
        }
 
        private void select_all () {
@@ -355,6 +357,8 @@ private class Games.CollectionView : Gtk.Box, UiView {
                        games_page.select_all ();
                else
                        collections_page.select_all ();
+
+               on_selected_items_changed ();
        }
 
        private void toggle_select () {
@@ -407,7 +411,7 @@ private class Games.CollectionView : Gtk.Box, UiView {
                        return;
                }
 
-               update_selection_action_bar ();
+               on_selected_items_changed ();
        }
 
        public void remove_collection () {
@@ -478,15 +482,17 @@ private class Games.CollectionView : Gtk.Box, UiView {
        }
 
        [GtkCallback]
-       private void update_selection_action_bar () {
-               Game[] games = {};
-               if (viewstack.visible_child == games_page)
-                       games = games_page.get_selected_games ();
-               else if (viewstack.visible_child == platforms_page)
-                       games = platforms_page.get_selected_games ();
+       private void on_selected_items_changed () {
+               var games = get_currently_selected_games ();
+
+               var length = games.length;
+               string label;
+               if (length != 0)
+                       label = ngettext ("Selected %d item", "Selected %d items", length).printf (length);
                else
-                       games = collections_page.get_selected_games ();
+                       label = _("Click on items to select them");
 
+               selection_mode_label.label = label;
                selection_action_bar.update (games);
        }