[gnome-tetravex/arnaudb/wip/gtk4: 48/49] Adapt to DrawingArea API.

[Arnaud B. <arnaudb src gnome org>]

commit 475ab31f2f09eb55355a048cff8fd8d85d1275aa
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Tue Aug 4 16:21:19 2020 +0200

    Adapt to DrawingArea API.

 src/puzzle-view.vala | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/src/puzzle-view.vala b/src/puzzle-view.vala
index d4376f4..de41b21 100644
--- a/src/puzzle-view.vala
+++ b/src/puzzle-view.vala
@@ -196,7 +196,7 @@ private class PuzzleView : Gtk.DrawingArea
         init_mouse ();
         init_keyboard ();
         set_draw_func (draw);
-        size_allocate.connect (on_size_allocate);
+        resize.connect (on_resize);
 
         animation_timer.start ();
     }
@@ -339,12 +339,10 @@ private class PuzzleView : Gtk.DrawingArea
     }
 
     internal const double gap_factor = 0.5;
-    private inline void on_size_allocate ()
+    private inline void on_resize (int allocated_width, int allocated_height)
     {
         if (puzzle_init_done)
         {
-            int allocated_width  = get_allocated_width ();
-            int allocated_height = get_allocated_height ();
             /* Fit in with a half tile border and spacing between boards */
             uint width  = (uint) (allocated_width  / (2 * puzzle.size + 1.0 + /* 1 × */ gap_factor));
             uint height = (uint) (allocated_height / (puzzle.size + 1.0));