[gnome-music/wip/jfelder/remove-gtk-dialog-run-usage: 2/2] lastfmdialog: Use response signal instead of the run method

[Jean Felder <jfelder src gnome org>]

commit a72b2496c7cb917aee8e3fed69772a4f21c5f53e
Author: Jean Felder <jfelder src gnome org>
Date:   Mon Jan 10 17:35:49 2022 +0100

    lastfmdialog: Use response signal instead of the run method
    
    gtk_dialog_run has been removed in gtk4.

 gnomemusic/application.py | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)
---
diff --git a/gnomemusic/application.py b/gnomemusic/application.py
index c92a6aa1e..b5dff88dd 100644
--- a/gnomemusic/application.py
+++ b/gnomemusic/application.py
@@ -30,6 +30,7 @@
 # code, but you are not obligated to do so.  If you do not wish to do so,
 # delete this exception statement from your version.
 
+from typing import Optional
 from gettext import gettext as _
 
 from gi.repository import Gtk, Gio, GLib, Gdk, GObject
@@ -78,6 +79,8 @@ class Application(Gtk.Application):
         self._lastfm_scrobbler = LastFmScrobbler(self)
         self._player = Player(self)
 
+        self._lastfm_dialog: Optional[LastfmDialog] = None
+
         InhibitSuspend(self)
         PauseOnSuspend(self._player)
 
@@ -208,10 +211,21 @@ class Application(Gtk.Application):
         except GLib.Error:
             self._log.message("Help handler not available.")
 
-    def _lastfm_account(self, action, param):
-        lastfm_dialog = LastfmDialog(self._window, self._lastfm_scrobbler)
-        lastfm_dialog.run()
-        lastfm_dialog.destroy()
+    def _lastfm_account(
+            self, action: Gio.SimpleAction,
+            param: Optional[GLib.Variant]) -> None:
+
+        def on_response(dialog: LastfmDialog, response_id: int) -> None:
+            if not self._lastfm_dialog:
+                return
+
+            self._lastfm_dialog.destroy()
+            self._lastfm_dialog = None
+
+        self._lastfm_dialog = LastfmDialog(
+            self._window, self._lastfm_scrobbler)
+        self._lastfm_dialog.connect("response", on_response)
+        self._lastfm_dialog.present()
 
     def _about(self, action, param):
         about = AboutDialog()