[gnome-music/wip/mschraal/selection-fixes: 2/4] window: Add active-view property

[Marinus Schraal <mschraal src gnome org>]

commit d1cc29b29b2134bcf08a994f61c3c4ef04130ae2
Author: Marinus Schraal <mschraal gnome org>
Date:   Fri Oct 4 16:31:19 2019 +0200

    window: Add active-view property
    
    Property that indicates the currently active view.

 gnomemusic/window.py | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/gnomemusic/window.py b/gnomemusic/window.py
index d805e992..efe4c4bb 100644
--- a/gnomemusic/window.py
+++ b/gnomemusic/window.py
@@ -55,6 +55,7 @@ class Window(Gtk.ApplicationWindow):
 
     __gtype_name__ = "Window"
 
+    active_view = GObject.Property(type=GObject.GObject, default=None)
     selected_items_count = GObject.Property(type=int, default=0, minimum=0)
     selection_mode = GObject.Property(type=bool, default=False)
 
@@ -166,6 +167,8 @@ class Window(Gtk.ApplicationWindow):
         # if some music is available, populate stack with mainviews,
         # show stack and set empty_view to empty_search_view
         self.views[View.EMPTY] = EmptyView()
+        self._stack.connect(
+            "notify::visible-child", self._on_stack_visible_child_changed)
         self._stack.add_named(self.views[View.EMPTY], "emptyview")
 
         # Add the 'background' styleclass so it properly hides the
@@ -224,6 +227,9 @@ class Window(Gtk.ApplicationWindow):
         else:
             self._switch_to_empty_view()
 
+    def _on_stack_visible_child_changed(self, klass, value):
+        self.props.active_view = self._stack.props.visible_child
+
     def _on_tracker_available(self, klass, value):
         grilo = self._app.props.coremodel.props.grilo
         new_state = grilo.props.tracker_available