[gtk/wip/ebassi/constraint-layout: 4/5] window: Create a GtkConstraintSolver

[Emmanuele Bassi <ebassi src gnome org>]

commit 7e9b0c8fb0fae313d3be542068bf21d2b9199c9f
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 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index de59910b0c..0039fe5326 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -282,6 +282,8 @@ typedef struct
   GskRenderer *renderer;
 
   GList *foci;
+
+  GtkConstraintSolver *constraint_solver;
 } GtkWindowPrivate;
 
 #ifdef GDK_WINDOWING_X11
@@ -1893,6 +1895,8 @@ gtk_window_init (GtkWindow *window)
   gtk_widget_add_controller (widget, priv->key_controller);
 
   add_actions (window);
+
+  priv->constraint_solver = gtk_constraint_solver_new ();
 }
 
 static GtkGesture *
@@ -2360,6 +2364,15 @@ gtk_window_root_get_renderer (GtkRoot *root)
   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_root_get_surface_transform (GtkRoot *root,
                                        int     *x,
@@ -2384,6 +2397,7 @@ gtk_window_root_interface_init (GtkRootInterface *iface)
   iface->get_display = gtk_window_root_get_display;
   iface->get_renderer = gtk_window_root_get_renderer;
   iface->get_surface_transform = gtk_window_root_get_surface_transform;
+  iface->get_constraint_solver = gtk_window_root_get_constraint_solver;
 }
 
 /**
@@ -4782,6 +4796,7 @@ 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);