[gnome-music/wip/jfelder/albumview-rubberband] albumviews: Add rubberband selection

[Jean Felder <jfelder src gnome org>]

commit 568670f9a41f985942b3b02cb71ed649536f9e0d
Author: Jean Felder <jfelder src gnome org>
Date:   Thu Jan 24 17:44:25 2019 +0100

    albumviews: Add rubberband selection

 data/org.gnome.Music.css       |  5 +++++
 data/ui/AlbumCover.ui          |  3 +++
 gnomemusic/views/albumsview.py | 20 ++++++++++++++++++--
 3 files changed, 26 insertions(+), 2 deletions(-)
---
diff --git a/data/org.gnome.Music.css b/data/org.gnome.Music.css
index f5ea3b7b..ad86e82e 100644
--- a/data/org.gnome.Music.css
+++ b/data/org.gnome.Music.css
@@ -5,6 +5,11 @@
 /* AlbumCover */
 .albumcover-artist-label {
     font-size: smaller;
+    color: @theme_fg_color;
+}
+
+.albumcover-title-label {
+    color: @theme_fg_color;
 }
 
 /* By default in Adwaita dark this is not transparent */
diff --git a/data/ui/AlbumCover.ui b/data/ui/AlbumCover.ui
index 46d21b3c..bbae5682 100644
--- a/data/ui/AlbumCover.ui
+++ b/data/ui/AlbumCover.ui
@@ -51,6 +51,9 @@
             <property name="ellipsize">middle</property>
             <property name="max_width_chars">20</property>
             <property name="lines">2</property>
+            <style>
+              <class name="albumcover-title-label"/>
+            </style>
           </object>
         </child>
         <child>
diff --git a/gnomemusic/views/albumsview.py b/gnomemusic/views/albumsview.py
index 4e0edf4f..c89d2fd6 100644
--- a/gnomemusic/views/albumsview.py
+++ b/gnomemusic/views/albumsview.py
@@ -23,7 +23,7 @@
 # delete this exception statement from your version.
 
 from gettext import gettext as _
-from gi.repository import GObject, Gtk
+from gi.repository import GLib, GObject, Gtk
 
 from gnomemusic import log
 from gnomemusic.grilo import grilo
@@ -70,12 +70,14 @@ class AlbumsView(BaseView):
     def _setup_view(self):
         self._view = Gtk.FlowBox(
             homogeneous=True, hexpand=True, halign=Gtk.Align.FILL,
-            valign=Gtk.Align.START, selection_mode=Gtk.SelectionMode.NONE,
+            valign=Gtk.Align.START, selection_mode=Gtk.SelectionMode.MULTIPLE,
             margin=18, row_spacing=12, column_spacing=6,
             min_children_per_line=1, max_children_per_line=20)
 
         self._view.get_style_context().add_class('content-view')
         self._view.connect('child-activated', self._on_child_activated)
+        self._view.connect(
+            'selected-children-changed', self._on_selected_children_changed)
 
         scrolledwin = Gtk.ScrolledWindow()
         scrolledwin.add(self._view)
@@ -102,6 +104,20 @@ class AlbumsView(BaseView):
         self._headerbar.props.subtitle = utils.get_artist_name(item)
         self.set_visible_child(self._album_widget)
 
+    @log
+    def _on_selected_children_changed(self, widget):
+        def select_children():
+            if self._headerbar.props.state == HeaderBar.State.CHILD:
+                return
+
+            if not self.props.selection_mode:
+                self.props.selection_mode = True
+
+            for child in self._view.get_selected_children():
+                child.props.selected = True
+
+        GLib.idle_add(select_children)
+
     @log
     def populate(self):
         self._window.notifications_popup.push_loading()