[gnome-music/wip/jfelder/searchview-new-style: 13/15] searchview: Limit artists results to one row

[Jean Felder <jfelder src gnome org>]

commit ff223e351301f084f4286849b6f7e88350ee8009
Author: Jean Felder <jfelder src gnome org>
Date:   Mon Aug 5 01:33:18 2019 +0200

    searchview: Limit artists results to one row
    
    Artist results need to be displayed on only one row (a row can have up
    to 6 results). But, on smaller screens, the row can be changed into
    multiple rows. In that event, the latest results should be hidden to
    display only one row.
    
    Fix the issue by listening to the "size-allocate" signal of the
    flowbox. If the window is too small, the latest results are hidden. If
    the window becomes wider, they are displayed again.

 gnomemusic/views/searchview.py | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
---
diff --git a/gnomemusic/views/searchview.py b/gnomemusic/views/searchview.py
index 8335e11c..a7f5b5dd 100644
--- a/gnomemusic/views/searchview.py
+++ b/gnomemusic/views/searchview.py
@@ -102,6 +102,8 @@ class SearchView(Gtk.Stack):
             "items-changed", self._on_artist_model_items_changed)
         self._artist_flowbox.bind_model(
             self._artist_filter, self._create_artist_widget)
+        self._artist_flowbox.connect(
+            "size-allocate", self._on_artist_flowbox_size_allocate)
         self._on_artist_model_items_changed(self._artist_filter, 0, 0, 0)
 
         self._player = self._application.props.player
@@ -263,6 +265,36 @@ class SearchView(Gtk.Stack):
             child = self._album_flowbox.get_child_at_index(i)
             child.props.visible = True
 
+    def _on_artist_flowbox_size_allocate(self, widget, allocation, data=None):
+        nb_children = self._artist_filter.get_n_items()
+        if nb_children == 0:
+            return
+
+        first_child = self._album_flowbox.get_child_at_index(0)
+        child_height = first_child.get_allocation().height
+        if allocation.height > 1.5 * child_height:
+            for i in range(nb_children - 1, -1, -1):
+                child = self._artist_flowbox.get_child_at_index(i)
+                if child.props.visible is True:
+                    child.props.visible = False
+                    return
+
+        children_hidden = False
+        for idx in range(nb_children):
+            child = self._artist_flowbox.get_child_at_index(idx)
+            if not child.props.visible:
+                children_hidden = True
+                break
+        if children_hidden is False:
+            return
+
+        last_child = self._artist_flowbox.get_child_at_index(idx - 1)
+        last_child_allocation = last_child.get_allocation()
+        child_width = last_child_allocation.width
+        if (last_child_allocation.x + 2 * child_width) < allocation.width:
+            child = self._artist_flowbox.get_child_at_index(idx)
+            child.props.visible = True
+
     @Gtk.Template.Callback()
     def _on_album_activated(self, widget, child, user_data=None):
         corealbum = child.props.corealbum