gtk: Add a GTK_STATE_FLAG_WINDOW_UNFOCUSED widget state flag

This allows themes to style widgets differently according to whether the
toplevel window they are in is presented as focused.

https://bugzilla.gnome.org/show_bug.cgi?id=661428

gtk/gtkcssprovider.c

@@ -2007,6 +2007,7 @@ parse_selector_pseudo_class (GtkCssScanner  *scanner,
     { "inconsistent", 0, GTK_STATE_FLAG_INCONSISTENT },
     { "focused",      0, GTK_STATE_FLAG_FOCUSED },
     { "focus",        0, GTK_STATE_FLAG_FOCUSED },
+    { "window-unfocused", 0, GTK_STATE_FLAG_WINDOW_UNFOCUSED },
     { NULL, }
   }, nth_child_classes[] = {
     { "first",        GTK_REGION_FIRST, 0 },

gtk/gtkcssselector.c

@@ -153,7 +153,8 @@ _gtk_css_selector_print (const GtkCssSelector *selector,
         "selected",
         "insensitive",
         "inconsistent",
-        "focus"
+        "focus",
+        "window-unfocused"
       };
       guint i;
 

gtk/gtkenums.h

@@ -842,6 +842,7 @@ typedef enum
  * @GTK_STATE_FLAG_INSENSITIVE: Widget is insensitive.
  * @GTK_STATE_FLAG_INCONSISTENT: Widget is inconsistent.
  * @GTK_STATE_FLAG_FOCUSED: Widget has the keyboard focus.
+ * @GTK_STATE_FLAG_WINDOW_UNFOCUSED: Widget's toplevel window is unfocused.
  *
  * Describes a widget state.
  */
@@ -853,7 +854,8 @@ typedef enum
   GTK_STATE_FLAG_SELECTED     = 1 << 2,
   GTK_STATE_FLAG_INSENSITIVE  = 1 << 3,
   GTK_STATE_FLAG_INCONSISTENT = 1 << 4,
-  GTK_STATE_FLAG_FOCUSED      = 1 << 5
+  GTK_STATE_FLAG_FOCUSED      = 1 << 5,
+  GTK_STATE_FLAG_WINDOW_UNFOCUSED = 1 << 6
 } GtkStateFlags;
 
 /**

gtk/gtkwidget.c

@@ -307,13 +307,14 @@
 
 #define WIDGET_CLASS(w)	 GTK_WIDGET_GET_CLASS (w)
 
+#define GTK_STATE_FLAGS_BITS 7
+
 struct _GtkWidgetPrivate
 {
-  /* The state of the widget. There are actually only
+  /* The state of the widget. Needs to be able to hold all GtkStateFlags bits
-   * 5 widget states (defined in "gtkenums.h")
+   * (defined in "gtkenums.h").
-   * so 3 bits.
    */
-  guint state_flags : 6;
+  guint state_flags : GTK_STATE_FLAGS_BITS;
 
   guint direction             : 2;
 
@@ -529,7 +530,7 @@ enum {
 
 struct _GtkStateData
 {
-  guint         flags : 6;
+  guint         flags : GTK_STATE_FLAGS_BITS;
   guint         operation : 2;
   guint		use_forall : 1;
 };

gtk/gtkwindow.c

@@ -474,6 +474,8 @@ static void gtk_window_get_preferred_height   (GtkWidget           *widget,
 					       gint                *minimum_size,
 					       gint                *natural_size);
 
+static void ensure_state_flag_window_unfocused (GtkWidget *widget);
+
 G_DEFINE_TYPE_WITH_CODE (GtkWindow, gtk_window, GTK_TYPE_BIN,
                          G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
 						gtk_window_buildable_interface_init))
@@ -4817,6 +4819,8 @@ gtk_window_map (GtkWidget *widget)
     gtk_window_set_focus_visible (window, gtk_window_get_focus_visible (priv->transient_parent));
   else
     gtk_window_set_focus_visible (window, visible_focus == GTK_POLICY_ALWAYS);
+
+  ensure_state_flag_window_unfocused (widget);
 }
 
 static gboolean
@@ -5463,6 +5467,9 @@ gtk_window_state_event (GtkWidget           *widget,
 {
   update_grip_visibility (GTK_WINDOW (widget));
 
+  if (event->changed_mask & GDK_WINDOW_STATE_FOCUSED)
+    ensure_state_flag_window_unfocused (widget);
+
   return FALSE;
 }
 
@@ -9618,3 +9625,21 @@ gtk_window_set_has_user_ref_count (GtkWindow *window,
 
   window->priv->has_user_ref_count = setting;
 }
+
+static void
+ensure_state_flag_window_unfocused (GtkWidget *widget)
+{
+  GdkWindow *window;
+  gboolean window_focused = TRUE;
+
+  window = gtk_widget_get_window (widget);
+
+  window_focused = gdk_window_get_state (window) & GDK_WINDOW_STATE_FOCUSED;
+
+  if (!window_focused)
+    gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_WINDOW_UNFOCUSED, FALSE);
+  else
+    gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_WINDOW_UNFOCUSED);
+
+  gtk_widget_queue_draw (widget);
+}