[gnome-music/wip/jfelder/searchview-new-style: 5/9] searchview: Hide a section if search results is empty

[Marinus Schraal <mschraal src gnome org>]

commit 720ed2c54760ac7bbd30a8dc91cb190759a983db
Author: Jean Felder <jfelder src gnome org>
Date:   Sun Aug 4 02:03:44 2019 +0200

    searchview: Hide a section if search results is empty

 data/ui/SearchView.ui          |  6 +++---
 gnomemusic/views/searchview.py | 27 +++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 3 deletions(-)
---
diff --git a/data/ui/SearchView.ui b/data/ui/SearchView.ui
index 35460787..ae443837 100644
--- a/data/ui/SearchView.ui
+++ b/data/ui/SearchView.ui
@@ -19,7 +19,7 @@
             <property name="orientation">vertical</property>
             <property name="visible">True</property>
             <child>
-              <object class="GtkBox">
+              <object class="GtkBox" id="_artist_header">
                 <property name="halign">fill</property>
                 <property name="hexpand">True</property>
                 <property name="homogeneous">True</property>
@@ -65,7 +65,7 @@
               </object>
             </child>
             <child>
-              <object class="GtkBox">
+              <object class="GtkBox" id="_album_header">
                 <property name="halign">fill</property>
                 <property name="hexpand">True</property>
                 <property name="homogeneous">True</property>
@@ -111,7 +111,7 @@
               </object>
             </child>
             <child>
-              <object class="GtkBox">
+              <object class="GtkBox" id="_songs_header">
                 <property name="halign">fill</property>
                 <property name="hexpand">True</property>
                 <property name="homogeneous">True</property>
diff --git a/gnomemusic/views/searchview.py b/gnomemusic/views/searchview.py
index 8d381beb..9ec3e75f 100644
--- a/gnomemusic/views/searchview.py
+++ b/gnomemusic/views/searchview.py
@@ -49,9 +49,12 @@ class SearchView(Gtk.Stack):
     selected_items_count = GObject.Property(type=int, default=0, minimum=0)
     selection_mode = GObject.Property(type=bool, default=False)
 
+    _album_header = Gtk.Template.Child()
     _album_flowbox = Gtk.Template.Child()
+    _artist_header = Gtk.Template.Child()
     _artist_flowbox = Gtk.Template.Child()
     _search_results = Gtk.Template.Child()
+    _songs_header = Gtk.Template.Child()
     _songs_listbox = Gtk.Template.Child()
 
     def __repr__(self):
@@ -82,13 +85,22 @@ class SearchView(Gtk.Stack):
         self._artist_filter.set_filter_func(
             self._core_filter, self._artist_model, 6)
 
+        self._model.connect_after(
+            "items-changed", self._on_model_items_changed)
         self._songs_listbox.bind_model(self._model, self._create_song_widget)
+        self._on_model_items_changed(self._model, 0, 0, 0)
 
+        self._album_filter.connect_after(
+            "items-changed", self._on_album_model_items_changed)
         self._album_flowbox.bind_model(
             self._album_filter, self._create_album_widget)
+        self._on_album_model_items_changed(self._album_filter, 0, 0, 0)
 
+        self._artist_filter.connect_after(
+            "items-changed", self._on_artist_model_items_changed)
         self._artist_flowbox.bind_model(
             self._artist_filter, self._create_artist_widget)
+        self._on_artist_model_items_changed(self._artist_filter, 0, 0, 0)
 
         self._player = self._application.props.player
 
@@ -165,6 +177,21 @@ class SearchView(Gtk.Stack):
 
         return artist_tile
 
+    def _on_album_model_items_changed(self, model, position, removed, added):
+        items_found = model.get_n_items() > 0
+        self._album_header.props.visible = items_found
+        self._album_flowbox.props.visible = items_found
+
+    def _on_artist_model_items_changed(self, model, position, removed, added):
+        items_found = model.get_n_items() > 0
+        self._artist_header.props.visible = items_found
+        self._artist_flowbox.props.visible = items_found
+
+    def _on_model_items_changed(self, model, position, removed, added):
+        items_found = model.get_n_items() > 0
+        self._songs_header.props.visible = items_found
+        self._songs_listbox.props.visible = items_found
+
     def _song_activated(self, widget, event):
         mod_mask = Gtk.accelerator_get_default_mod_mask()
         if ((event.get_state() & mod_mask) == Gdk.ModifierType.CONTROL_MASK