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

[Matthias Clasen <matthiasc src gnome org>]

commit 318269550bd8fdb243390a3624527b558bc37a1c
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 10 00:25:19 2015 -0500

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

 gtk/gtkiconview.c |   58 ++++++++++++++++++++++++++++++++++------------------
 1 files changed, 38 insertions(+), 20 deletions(-)
---
diff --git a/gtk/gtkiconview.c b/gtk/gtkiconview.c
index 143acb6..f919cd9 100644
--- a/gtk/gtkiconview.c
+++ b/gtk/gtkiconview.c
@@ -44,6 +44,9 @@
 #include "gtktreednd.h"
 #include "gtktypebuiltins.h"
 #include "gtkprivate.h"
+#include "gtkcssnodeprivate.h"
+#include "gtkwidgetprivate.h"
+#include "gtkstylecontextprivate.h"
 #include "a11y/gtkiconviewaccessibleprivate.h"
 
 /**
@@ -65,7 +68,9 @@
  *
  * # CSS nodes
  *
+ *
  * GtkIconView has a single CSS node with name iconview and style class .view.
+ * For rubberband selection, a subnode with name rubberband is used.
  */
 
 #define SCROLL_EDGE_SIZE 15
@@ -2537,35 +2542,48 @@ gtk_icon_view_start_rubberbanding (GtkIconView  *icon_view,
                                   gint          x,
                                   gint          y)
 {
+  GtkIconViewPrivate *priv = icon_view->priv;
   GList *items;
+  GtkCssNode *widget_node;
 
-  if (icon_view->priv->rubberband_device)
+  if (priv->rubberband_device)
     return;
 
-  for (items = icon_view->priv->items; items; items = items->next)
+  for (items = priv->items; items; items = items->next)
     {
       GtkIconViewItem *item = items->data;
 
       item->selected_before_rubberbanding = item->selected;
     }
-  
-  icon_view->priv->rubberband_x1 = x;
-  icon_view->priv->rubberband_y1 = y;
-  icon_view->priv->rubberband_x2 = x;
-  icon_view->priv->rubberband_y2 = y;
 
-  icon_view->priv->doing_rubberband = TRUE;
-  icon_view->priv->rubberband_device = device;
+  priv->rubberband_x1 = x;
+  priv->rubberband_y1 = y;
+  priv->rubberband_x2 = x;
+  priv->rubberband_y2 = y;
+
+  priv->doing_rubberband = TRUE;
+  priv->rubberband_device = device;
+
+  widget_node = gtk_widget_get_css_node (GTK_WIDGET (icon_view));
+  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);
 }
 
 static void
 gtk_icon_view_stop_rubberbanding (GtkIconView *icon_view)
 {
-  if (!icon_view->priv->doing_rubberband)
+  GtkIconViewPrivate *priv = icon_view->priv;
+
+  if (!priv->doing_rubberband)
     return;
 
-  icon_view->priv->doing_rubberband = FALSE;
-  icon_view->priv->rubberband_device = NULL;
+  priv->doing_rubberband = FALSE;
+  priv->rubberband_device = NULL;
+  gtk_css_node_set_parent (priv->rubberband_node, NULL);
+  priv->rubberband_node = NULL;
 
   gtk_widget_queue_draw (GTK_WIDGET (icon_view));
 }
@@ -3119,23 +3137,23 @@ gtk_icon_view_paint_item (GtkIconView     *icon_view,
 }
 
 static void
-gtk_icon_view_paint_rubberband (GtkIconView     *icon_view,
-                               cairo_t         *cr)
+gtk_icon_view_paint_rubberband (GtkIconView *icon_view,
+                               cairo_t     *cr)
 {
+  GtkIconViewPrivate *priv = icon_view->priv;
   GtkStyleContext *context;
   GdkRectangle rect;
 
   cairo_save (cr);
 
-  rect.x = MIN (icon_view->priv->rubberband_x1, icon_view->priv->rubberband_x2);
-  rect.y = MIN (icon_view->priv->rubberband_y1, icon_view->priv->rubberband_y2);
-  rect.width = ABS (icon_view->priv->rubberband_x1 - icon_view->priv->rubberband_x2) + 1;
-  rect.height = ABS (icon_view->priv->rubberband_y1 - icon_view->priv->rubberband_y2) + 1;
+  rect.x = MIN (priv->rubberband_x1, priv->rubberband_x2);
+  rect.y = MIN (priv->rubberband_y1, priv->rubberband_y2);
+  rect.width = ABS (priv->rubberband_x1 - priv->rubberband_x2) + 1;
+  rect.height = ABS (priv->rubberband_y1 - priv->rubberband_y2) + 1;
 
   context = gtk_widget_get_style_context (GTK_WIDGET (icon_view));
 
-  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);
 
   gdk_cairo_rectangle (cr, &rect);
   cairo_clip (cr);