[four-in-a-row/arnaudb/wip/gtk4: 91/92] Adapt to HeaderBar API.

[Arnaud B. <arnaudb src gnome org>]

commit 6c6a68b2c3e225a863dc1a709f42bc4d6d352e10
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon May 4 14:43:07 2020 +0200

    Adapt to HeaderBar API.

 src/four-in-a-row.vala |  5 ++++-
 src/game-window.vala   | 23 +++++++++++------------
 2 files changed, 15 insertions(+), 13 deletions(-)
---
diff --git a/src/four-in-a-row.vala b/src/four-in-a-row.vala
index 566eaaa..fa84845 100644
--- a/src/four-in-a-row.vala
+++ b/src/four-in-a-row.vala
@@ -746,7 +746,10 @@ private class FourInARow : Gtk.Application
 
     private void set_status_message (string? message)
     {
-        window.set_subtitle (message);
+        if (message == null)
+            window.set_subtitle ("");
+        else
+            window.set_subtitle ((!) message);
     }
 
     private class NextMove
diff --git a/src/game-window.vala b/src/game-window.vala
index 3c699f2..2897d98 100644
--- a/src/game-window.vala
+++ b/src/game-window.vala
@@ -83,9 +83,8 @@ private class GameWindow : AdaptativeWindow, AdaptativeWidget
         /* window config */
         install_ui_action_entries ();
         program_name = name;
-        set_title (name);
         if (!is_extra_thin)
-            headerbar.set_title (name);
+            set_title (name);
         info_button.set_menu_model (app_menu);
 
         /* add widgets */
@@ -207,12 +206,12 @@ private class GameWindow : AdaptativeWindow, AdaptativeWidget
 //        headerbar.set_subtitle (null);
 //    }
 
-    internal void set_subtitle (string? subtitle)
+    internal void set_subtitle (string subtitle)
     {
         if (!is_extra_thin)
-            headerbar.set_title (subtitle);
+            set_title (subtitle);
         last_subtitle = subtitle;
-        if (subtitle == null)
+        if (subtitle == "")
             actionbar.set_visibility (false);
         else
         {
@@ -265,7 +264,7 @@ private class GameWindow : AdaptativeWindow, AdaptativeWidget
 
         if (is_extra_thin)
         {
-            headerbar.set_title (null);
+            set_title ("");
             if (game_widget_1 != null)
                 ((!) game_widget_1).hide ();
         }
@@ -275,9 +274,9 @@ private class GameWindow : AdaptativeWindow, AdaptativeWidget
                 ((!) game_widget_1).show ();
             string? panel_name = stack.get_visible_child_name ();
             if (panel_name != null && (!) panel_name == "start-box")
-                headerbar.set_title (program_name);
+                set_title (program_name);
             else
-                headerbar.set_title (last_subtitle);
+                set_title (last_subtitle);
         }
     }
 
@@ -285,11 +284,11 @@ private class GameWindow : AdaptativeWindow, AdaptativeWidget
     * * Showing the Stack
     \*/
 
-    private string? last_subtitle = null;
+    private string last_subtitle = "";
     private void show_new_game_screen ()
     {
         if (!is_extra_thin)
-            headerbar.set_title (program_name);
+            set_title (program_name);
         actionbar.set_visibility (false);
 
         stack.set_visible_child_name ("start-box");
@@ -306,7 +305,7 @@ private class GameWindow : AdaptativeWindow, AdaptativeWidget
     private void show_view ()
     {
         if (!is_extra_thin)
-            headerbar.set_title (last_subtitle);
+            set_title (last_subtitle);
         actionbar.set_visibility (true);
 
         stack.set_visible_child_name ("game-box");
@@ -348,7 +347,7 @@ private class GameWindow : AdaptativeWindow, AdaptativeWidget
         if (stack_child == null || (!) stack_child != "start-box")
             return;
 
-        last_subtitle = null;
+        last_subtitle = "";
         game_finished = false;
 
         undo_action.set_enabled (false);