[gtk/wip/ebassi/constraint-layout: 93/105] window: Create a GtkConstraintSolver

[Emmanuele Bassi <ebassi src gnome org>]

commit e7cd3d46332fb0ec8b267f96381bbc896a2a8656
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Apr 9 14:22:19 2019 +0100

    window: Create a GtkConstraintSolver
    
    Implement the GtkRoot getter for GtkConstraintSolver.

 gtk/gtkwindow.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 3730841f36..dab50be990 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -281,6 +281,8 @@ typedef struct
   GskRenderer *renderer;
 
   GList *foci;
+
+  GtkConstraintSolver *constraint_solver;
 } GtkWindowPrivate;
 
 #ifdef GDK_WINDOWING_X11
@@ -1883,6 +1885,9 @@ gtk_window_init (GtkWindow *window)
   g_signal_connect_swapped (priv->key_controller, "key-released",
                             G_CALLBACK (gtk_window_key_released), window);
   gtk_widget_add_controller (widget, priv->key_controller);
+
+  /* Shared constraint solver */
+  priv->constraint_solver = gtk_constraint_solver_new ();
 }
 
 static GtkGesture *
@@ -2353,6 +2358,15 @@ gtk_window_native_get_renderer (GtkNative *native)
   return priv->renderer;
 }
 
+static GtkConstraintSolver *
+gtk_window_root_get_constraint_solver (GtkRoot *root)
+{
+  GtkWindow *self = GTK_WINDOW (root);
+  GtkWindowPrivate *priv = gtk_window_get_instance_private (self);
+
+  return priv->constraint_solver;
+}
+
 static void
 gtk_window_native_get_surface_transform (GtkNative *native,
                                          int       *x,
@@ -2381,6 +2395,7 @@ static void
 gtk_window_root_interface_init (GtkRootInterface *iface)
 {
   iface->get_display = gtk_window_root_get_display;
+  iface->get_constraint_solver = gtk_window_root_get_constraint_solver;
 }
 
 static void
@@ -4723,6 +4738,7 @@ gtk_window_finalize (GObject *object)
       priv->mnemonics_display_timeout_id = 0;
     }
 
+  g_clear_object (&priv->constraint_solver);
   g_clear_object (&priv->renderer);
 
   G_OBJECT_CLASS (gtk_window_parent_class)->finalize (object);