[gnome-robots/arnaudb/wip/gtk4: 35/45] Adapt to DrawingArea API.

[Arnaud B. <arnaudb src gnome org>]

commit 8775f2c5da93a80af29c3a24e0892b7e1534022e
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon May 25 20:45:46 2020 +0200

    Adapt to DrawingArea API.

 src/gnome-robots.c |  4 +---
 src/graphics.c     | 22 ++++++++++++----------
 src/graphics.h     |  7 +++++--
 3 files changed, 18 insertions(+), 15 deletions(-)
---
diff --git a/src/gnome-robots.c b/src/gnome-robots.c
index a248063..204cea4 100644
--- a/src/gnome-robots.c
+++ b/src/gnome-robots.c
@@ -390,9 +390,7 @@ activate (GtkApplication *app, gpointer user_data)
   make_cursors ();
 
   game_area = gtk_drawing_area_new ();
-  g_signal_connect (G_OBJECT (game_area), "configure-event",        G_CALLBACK (resize_cb), NULL);
-  g_signal_connect (G_OBJECT (game_area), "draw",                   G_CALLBACK (draw_cb),   NULL);
-  g_signal_connect (G_OBJECT (game_area), "destroy",                G_CALLBACK (gtk_widget_destroyed), 
&game_area);
+  gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (game_area), draw_cb, NULL, NULL);
 
   click_controller = gtk_gesture_click_new ();
   g_signal_connect (G_OBJECT (click_controller), "pressed", G_CALLBACK (mouse_cb), NULL);
diff --git a/src/graphics.c b/src/graphics.c
index fcbd2ab..fa1a23f 100644
--- a/src/graphics.c
+++ b/src/graphics.c
@@ -95,29 +95,33 @@ render_graphics (void)
   rerender_needed = FALSE;
 }
 
-gboolean
-resize_cb (GtkWidget * w, GdkEventConfigure * e, gpointer data)
+void
+resize_if_needed (int width, int height)
 {
   gint trial_width;
   gint trial_height;
 
-  trial_width = e->width / GAME_WIDTH;
-  trial_height = e->height / GAME_HEIGHT;
+  trial_width = width / GAME_WIDTH;
+  trial_height = height / GAME_HEIGHT;
 
   if ((trial_width != tile_width) || (trial_height != tile_height)) {
     tile_width = trial_width;
     tile_height = trial_height;
     rerender_needed = TRUE;
   }
-
-  return FALSE;
 }
 
-gboolean
-draw_cb (GtkWidget * w, cairo_t * cr, gpointer data)
+void
+draw_cb (GtkDrawingArea   *drawing_area,
+         cairo_t          *cr,
+         int               width,
+         int               height,
+         gpointer          user_data)
 {
   int i, j;
 
+  resize_if_needed (width, height);
+
   for (j = 0; j < GAME_HEIGHT; j++) {
     for (i = 0; i < GAME_WIDTH; i++) {
       draw_object (i, j, arena[i][j], cr);
@@ -125,8 +129,6 @@ draw_cb (GtkWidget * w, cairo_t * cr, gpointer data)
   }
 
   draw_bubble (cr);
-
-  return TRUE;
 }
 
 /**
diff --git a/src/graphics.h b/src/graphics.h
index 5ed44e2..ba327dd 100644
--- a/src/graphics.h
+++ b/src/graphics.h
@@ -10,8 +10,11 @@ extern gint tile_height;
 /**********************************************************************/
 /* Exported functions                                                 */
 /**********************************************************************/
-gboolean resize_cb (GtkWidget * w, GdkEventConfigure * e, gpointer data);
-gboolean draw_cb (GtkWidget * w, cairo_t * cr, gpointer data);
+void draw_cb (GtkDrawingArea   *drawing_area,
+              cairo_t          *cr,
+              int               width,
+              int               height,
+              gpointer          user_data);
 gboolean load_game_graphics (void);
 gboolean free_game_graphics (void);
 gint num_game_graphics (void);