[gtk+] Update testtextview.c to use draw_layer

[Alexander Larsson <alexl src gnome org>]

commit 341108d4fc93217c0aa3cf634e8d84bf79604c30
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Jul 28 21:19:31 2014 +0200

    Update testtextview.c to use draw_layer
    
    This fixes a regression in the test from the revert in
    commit 4fe051bb4a017d2840f2b0f4299512971f17a837.

 tests/testtextview.c |   39 +++++++++++++++++++++++++++++++++++----
 1 files changed, 35 insertions(+), 4 deletions(-)
---
diff --git a/tests/testtextview.c b/tests/testtextview.c
index 22fe524..c46a59b 100644
--- a/tests/testtextview.c
+++ b/tests/testtextview.c
@@ -3,6 +3,36 @@
 #include "config.h"
 #include <gtk/gtk.h>
 
+typedef struct {
+  GtkTextView parent;
+} MyTextView;
+
+typedef struct {
+  GtkTextViewClass parent_class;
+} MyTextViewClass;
+
+G_DEFINE_TYPE (MyTextView, my_text_view, GTK_TYPE_TEXT_VIEW);
+
+static void draw_background (GtkWidget *widget, cairo_t *cr);
+
+static void
+my_text_view_init (MyTextView *text_view)
+{
+}
+
+static void my_text_view_draw_layer (GtkWidget         *widget,
+                                    GtkTextViewLayer   layer,
+                                    cairo_t           *cr)
+{
+  if (layer == GTK_TEXT_VIEW_LAYER_BELOW)
+    draw_background (widget, cr);
+}
+
+static void
+my_text_view_class_init (MyTextViewClass *klass)
+{
+  GTK_TEXT_VIEW_CLASS (klass)->draw_layer = my_text_view_draw_layer;
+}
 
 static void
 create_tags (GtkTextBuffer *buffer)
@@ -138,10 +168,14 @@ get_checkered (void)
 static void
 draw_background (GtkWidget *widget, cairo_t *cr)
 {
+  GdkRectangle visible_rect;
   cairo_pattern_t *pat;
 
   cairo_save (cr);
 
+  gtk_text_view_get_visible_rect (GTK_TEXT_VIEW (widget), &visible_rect);
+  cairo_translate (cr, -visible_rect.x, -visible_rect.y);
+
   cairo_set_source_rgb (cr, CHECK_DARK, CHECK_DARK, CHECK_DARK);
   cairo_paint (cr);
 
@@ -166,7 +200,7 @@ main (int argc, char **argv)
 
   window   = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   sw       = gtk_scrolled_window_new (NULL, NULL);
-  textview = gtk_text_view_new ();
+  textview = g_object_new (my_text_view_get_type (), NULL);
   buffer   = gtk_text_view_get_buffer (GTK_TEXT_VIEW (textview));
   button   = gtk_button_new_with_label ("Fixed Child");
   button2   = gtk_button_new_with_label ("Flowed Child");
@@ -195,9 +229,6 @@ main (int argc, char **argv)
   gtk_text_view_add_child_at_anchor (GTK_TEXT_VIEW (textview),
                                      button2, anchor);
 
-  g_signal_connect (textview, "draw",
-                   G_CALLBACK (draw_background), NULL);
-
   gtk_widget_show (window);
 
   gtk_main ();