[gtk+] flowbox: Use a CSS node for rubberband drawing

[Matthias Clasen <matthiasc src gnome org>]

commit 6c7f4b78b5652a04db8cb138c785c7efa6bc3a8c
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 10 00:50:42 2015 -0500

    flowbox: Use a CSS node for rubberband drawing
    
    Use a CSS node with name rubberband to draw the rubberband
    selection.

 gtk/gtkflowbox.c |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkflowbox.c b/gtk/gtkflowbox.c
index 6b553df..5c5cb86 100644
--- a/gtk/gtkflowbox.c
+++ b/gtk/gtkflowbox.c
@@ -56,6 +56,7 @@
  *
  * GtkFlowBox uses a single CSS node with name flowbox. GtkFlowBoxChild
  * uses a single CSS node with name flowboxchild.
+ * For rubberband selection, a subnode with name rubberband is used.
  */
 
 #include <config.h>
@@ -67,6 +68,7 @@
 #include "gtkintl.h"
 #include "gtkcssnodeprivate.h"
 #include "gtkwidgetprivate.h"
+#include "gtkstylecontextprivate.h"
 
 #include "a11y/gtkflowboxaccessibleprivate.h"
 #include "a11y/gtkflowboxchildaccessible.h"
@@ -813,9 +815,10 @@ struct _GtkFlowBoxPrivate {
   GtkGesture        *multipress_gesture;
   GtkGesture        *drag_gesture;
 
-  gboolean           rubberband_select;
   GtkFlowBoxChild   *rubberband_first;
   GtkFlowBoxChild   *rubberband_last;
+  GtkCssNode        *rubberband_node;
+  gboolean           rubberband_select;
   gboolean           rubberband_modify;
   gboolean           rubberband_extend;
 
@@ -2564,8 +2567,7 @@ gtk_flow_box_draw (GtkWidget *widget,
       cairo_save (cr);
 
       context = gtk_widget_get_style_context (widget);
-      gtk_style_context_save (context);
-      gtk_style_context_add_class (context, GTK_STYLE_CLASS_RUBBERBAND);
+      gtk_style_context_save_to_node (context, priv->rubberband_node);
 
       iter1 = CHILD_PRIV (priv->rubberband_first)->iter;
       iter2 = CHILD_PRIV (priv->rubberband_last)->iter;
@@ -2637,7 +2639,7 @@ gtk_flow_box_draw (GtkWidget *widget,
           cairo_append_path (cr, path);
           cairo_path_destroy (path);
 
-          state = gtk_widget_get_state_flags (widget);
+          state = gtk_style_context_get_state (context);
 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
           gtk_style_context_get_border_color (context, state, &border_color);
 G_GNUC_END_IGNORE_DEPRECATIONS
@@ -2863,6 +2865,7 @@ gtk_flow_box_drag_gesture_update (GtkGestureDrag *gesture,
   GtkFlowBoxPrivate *priv = BOX_PRIV (box);
   gdouble start_x, start_y;
   GtkFlowBoxChild *child;
+  GtkCssNode *widget_node;
 
   gtk_gesture_drag_get_start_point (gesture, &start_x, &start_y);
 
@@ -2871,6 +2874,13 @@ gtk_flow_box_drag_gesture_update (GtkGestureDrag *gesture,
     {
       priv->rubberband_select = TRUE;
       priv->rubberband_first = gtk_flow_box_find_child_at_pos (box, start_x, start_y);
+  
+      widget_node = gtk_widget_get_css_node (GTK_WIDGET (box));
+      priv->rubberband_node = gtk_css_node_new ();
+      gtk_css_node_set_name (priv->rubberband_node, I_("rubberband"));
+      gtk_css_node_set_parent (priv->rubberband_node, widget_node);
+      gtk_css_node_set_state (priv->rubberband_node, gtk_css_node_get_state (widget_node));
+      g_object_unref (priv->rubberband_node);
 
       /* Grab focus here, so Escape-to-stop-rubberband  works */
       gtk_flow_box_update_cursor (box, priv->rubberband_first);
@@ -3028,6 +3038,9 @@ gtk_flow_box_stop_rubberband (GtkFlowBox *box)
   priv->rubberband_first = NULL;
   priv->rubberband_last = NULL;
 
+  gtk_css_node_set_parent (priv->rubberband_node, NULL);
+  priv->rubberband_node = NULL;
+
   remove_autoscroll (box);
 
   gtk_widget_queue_draw (GTK_WIDGET (box));