[gtk+] textview: Use a CSS node for selection rendering

[Matthias Clasen <matthiasc src gnome org>]

commit bb786ac2404e99bfd14097006724dde177e0220d
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 10 21:18:10 2015 -0500

    textview: Use a CSS node for selection rendering
    
    Use a CSS node with name selection, like we do for entries
    and labels. Unlike those widgets, we currently don't user
    gtk_render_background, but just use the background color.
    That will require more effort.

 gtk/gtktextdisplay.c |   16 +++++++---------
 gtk/gtktextview.c    |   33 ++++++++++++++++++++++++++++++---
 2 files changed, 37 insertions(+), 12 deletions(-)
---
diff --git a/gtk/gtktextdisplay.c b/gtk/gtktextdisplay.c
index 6b5dbf4..24372d2 100644
--- a/gtk/gtktextdisplay.c
+++ b/gtk/gtktextdisplay.c
@@ -596,6 +596,8 @@ get_selected_clip (GtkTextRenderer    *text_renderer,
   return clip_region;
 }
 
+extern GtkCssNode *gtk_text_view_get_selection_node (GtkTextView *text_view);
+
 static void
 render_para (GtkTextRenderer    *text_renderer,
              GtkTextLineDisplay *line_display,
@@ -603,7 +605,6 @@ render_para (GtkTextRenderer    *text_renderer,
              int                 selection_end_index)
 {
   GtkStyleContext *context;
-  GtkStateFlags state;
   PangoLayout *layout = line_display->layout;
   int byte_offset = 0;
   PangoLayoutIter *iter;
@@ -611,6 +612,7 @@ render_para (GtkTextRenderer    *text_renderer,
   int screen_width;
   GdkRGBA selection;
   gboolean first = TRUE;
+  GtkCssNode *selection_node;
 
   iter = pango_layout_get_iter (layout);
 
@@ -624,14 +626,11 @@ render_para (GtkTextRenderer    *text_renderer,
   screen_width = line_display->total_width;
 
   context = gtk_widget_get_style_context (text_renderer->widget);
-  gtk_style_context_save (context);
-
-  state = gtk_style_context_get_state (context);
-  state |= GTK_STATE_FLAG_SELECTED;
-  gtk_style_context_set_state (context, state);
+  selection_node = gtk_text_view_get_selection_node ((GtkTextView*)text_renderer->widget);
+  gtk_style_context_save_to_node (context, selection_node);
 
 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
-  gtk_style_context_get_background_color (context, state, &selection);
+  gtk_style_context_get_background_color (context, gtk_style_context_get_state (context), &selection);
 G_GNUC_END_IGNORE_DEPRECATIONS
 
  gtk_style_context_restore (context);
@@ -825,9 +824,8 @@ G_GNUC_END_IGNORE_DEPRECATIONS
                 {
                   GdkRGBA color;
 
-                  state = gtk_style_context_get_state (context);
 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
-                  gtk_style_context_get_background_color (context, state, &color);
+                  gtk_style_context_get_background_color (context, gtk_style_context_get_state (context), 
&color);
 G_GNUC_END_IGNORE_DEPRECATIONS
 
                   gdk_cairo_set_source_rgba (cr, &color);
diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index 773a87f..b2db5ce 100644
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -233,6 +233,8 @@ struct _GtkTextViewPrivate
   GtkGesture *multipress_gesture;
   GtkGesture *drag_gesture;
 
+  GtkCssNode *selection_node;
+
   /* Default style settings */
   gint pixels_above_lines;
   gint pixels_below_lines;
@@ -1737,6 +1739,18 @@ gtk_text_view_init (GtkTextView *text_view)
   g_signal_connect (priv->drag_gesture, "drag-end",
                     G_CALLBACK (gtk_text_view_drag_gesture_end),
                     widget);
+
+  priv->selection_node = gtk_css_node_new ();
+  gtk_css_node_set_name (priv->selection_node, I_("selection"));
+  gtk_css_node_set_parent (priv->selection_node, priv->text_window->css_node);
+  gtk_css_node_set_state (priv->selection_node, gtk_css_node_get_state (priv->text_window->css_node));
+  g_object_unref (priv->selection_node);
+}
+
+GtkCssNode *
+gtk_text_view_get_selection_node (GtkTextView *text_view)
+{
+  return text_view->priv->selection_node;
 }
 
 static void
@@ -4838,6 +4852,7 @@ gtk_text_view_state_flags_changed (GtkWidget     *widget,
                                    GtkStateFlags  previous_state)
 {
   GtkTextView *text_view = GTK_TEXT_VIEW (widget);
+  GtkTextViewPrivate *priv = text_view->priv;
   GdkCursor *cursor;
 
   if (gtk_widget_get_realized (widget))
@@ -4847,12 +4862,12 @@ gtk_text_view_state_flags_changed (GtkWidget     *widget,
       else
         cursor = NULL;
 
-      gdk_window_set_cursor (text_view->priv->text_window->bin_window, cursor);
+      gdk_window_set_cursor (priv->text_window->bin_window, cursor);
 
       if (cursor)
       g_object_unref (cursor);
 
-      text_view->priv->mouse_cursor_obscured = FALSE;
+      priv->mouse_cursor_obscured = FALSE;
     }
 
   if (!gtk_widget_is_sensitive (widget))
@@ -4860,7 +4875,19 @@ gtk_text_view_state_flags_changed (GtkWidget     *widget,
       /* Clear any selection */
       gtk_text_view_unselect (text_view);
     }
-  
+
+  gtk_css_node_set_state (priv->text_window->css_node, gtk_widget_get_state (widget));
+  gtk_css_node_set_state (priv->selection_node, gtk_widget_get_state (widget));
+
+  if (priv->left_window)
+    gtk_css_node_set_state (priv->left_window->css_node, gtk_widget_get_state (widget));
+  if (priv->right_window)
+    gtk_css_node_set_state (priv->right_window->css_node, gtk_widget_get_state (widget));
+  if (priv->top_window)
+    gtk_css_node_set_state (priv->top_window->css_node, gtk_widget_get_state (widget));
+  if (priv->bottom_window)
+    gtk_css_node_set_state (priv->bottom_window->css_node, gtk_widget_get_state (widget));
+
   gtk_widget_queue_draw (widget);
 }