[goffice] gui: install goffice.css for all widgets.

[Morten Welinder <mortenw src gnome org>]

commit 68684d5d96a111c520f27af37e70c9d023009dc1
Author: Morten Welinder <terra gnome org>
Date:   Tue Dec 5 20:27:08 2017 -0500

    gui: install goffice.css for all widgets.

 ChangeLog                 |    5 +++++
 goffice/gtk/goffice-gtk.c |   25 ++++++++++++++++++++-----
 goffice/gtk/goffice.css   |   14 ++++++++++++++
 3 files changed, 39 insertions(+), 5 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index f3eb887..6bcff9b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-12-05  Morten Welinder  <terra gnome org>
+
+       * goffice/gtk/goffice-gtk.c (_go_gtk_widget_add_css_provider):
+       Install the css provider screen-wide.
+
 2017-12-02  Morten Welinder  <terra gnome org>
 
        * goffice/gtk/go-rotation-sel.c (cb_rotate_canvas_realize): Use
diff --git a/goffice/gtk/goffice-gtk.c b/goffice/gtk/goffice-gtk.c
index 91ce5b1..8c3641b 100644
--- a/goffice/gtk/goffice-gtk.c
+++ b/goffice/gtk/goffice-gtk.c
@@ -1635,6 +1635,21 @@ go_gtk_widget_render_icon_pixbuf (GtkWidget   *widget,
 }
 
 static GtkCssProvider *css_provider;
+static GSList *css_provider_screens;
+
+static void
+cb_screen_changed (GtkWidget *widget)
+{
+       GdkScreen *screen = gtk_widget_get_screen (widget);
+
+       if (!screen || g_slist_find (css_provider_screens, screen))
+               return;
+
+       css_provider_screens = g_slist_prepend (css_provider_screens, screen);
+       gtk_style_context_add_provider_for_screen (screen, css_provider,
+                                                  GTK_STYLE_PROVIDER_PRIORITY_FALLBACK);
+}
+
 
 void
 _go_gtk_widget_add_css_provider (GtkWidget *w)
@@ -1647,15 +1662,15 @@ _go_gtk_widget_add_css_provider (GtkWidget *w)
                gtk_css_provider_load_from_data (css_provider, data, -1, NULL);
        }
 
-       // NOTE: This applies to *just* this widget.
-       gtk_style_context_add_provider
-               (gtk_widget_get_style_context (w),
-                GTK_STYLE_PROVIDER (css_provider),
-                GTK_STYLE_PROVIDER_PRIORITY_FALLBACK);
+       g_signal_connect (w, "screen-changed",
+                         G_CALLBACK (cb_screen_changed), NULL);
+       cb_screen_changed (w);
 }
 
 void
 _go_gtk_shutdown (void)
 {
        g_clear_object (&css_provider);
+       g_slist_free (css_provider_screens);
+       css_provider_screens = NULL;
 }
diff --git a/goffice/gtk/goffice.css b/goffice/gtk/goffice.css
index f5be9b2..95da1d5 100644
--- a/goffice/gtk/goffice.css
+++ b/goffice/gtk/goffice.css
@@ -6,6 +6,7 @@
  */
 
 /* ------------------------------------------------------------------------- */
+/* Gtk 3.19 and earlier: */
 
 GORotationSel GocCanvas {
   background-image: none;
@@ -16,3 +17,16 @@ GO3DRotationSel GocCanvas {
   background-image: none;
   background-color: white;
 }
+
+/* ------------------------------------------------------------------------- */
+/* Gtk 3.20 and later: */
+
+rotationselector canvas {
+  background-image: none;
+  background-color: white;
+}
+
+rotation3dselector canvas {
+  background-image: none;
+  background-color: white;
+}