[evince] a11y: implement AtkDocument on EvViewAccessible

[Alejandro Piñeiro Iglesias <apinheiro src gnome org>]

commit c5c528dc8ec9d24845c21c3947581d7f7c1eb477
Author: Alejandro Piñeiro <apinheiro igalia com>
Date:   Thu Nov 28 17:55:04 2013 +0100

    a11y: implement AtkDocument on EvViewAccessible
    
    https://bugzilla.gnome.org/show_bug.cgi?id=719507

 libview/ev-view-accessible.c |   63 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 63 insertions(+), 0 deletions(-)
---
diff --git a/libview/ev-view-accessible.c b/libview/ev-view-accessible.c
index f4fc0fa..0412773 100644
--- a/libview/ev-view-accessible.c
+++ b/libview/ev-view-accessible.c
@@ -33,6 +33,7 @@
 static void ev_view_accessible_text_iface_init      (AtkTextIface      *iface);
 static void ev_view_accessible_action_iface_init    (AtkActionIface    *iface);
 static void ev_view_accessible_hypertext_iface_init (AtkHypertextIface *iface);
+static void ev_view_accessible_document_iface_init  (AtkDocumentIface  *iface);
 
 enum {
        ACTION_SCROLL_UP,
@@ -75,6 +76,7 @@ G_DEFINE_TYPE_WITH_CODE (EvViewAccessible, ev_view_accessible, GTK_TYPE_CONTAINE
                         G_IMPLEMENT_INTERFACE (ATK_TYPE_TEXT, ev_view_accessible_text_iface_init)
                         G_IMPLEMENT_INTERFACE (ATK_TYPE_ACTION, ev_view_accessible_action_iface_init)
                         G_IMPLEMENT_INTERFACE (ATK_TYPE_HYPERTEXT, ev_view_accessible_hypertext_iface_init)
+                        G_IMPLEMENT_INTERFACE (ATK_TYPE_DOCUMENT, ev_view_accessible_document_iface_init)
        )
 
 static gint
@@ -854,6 +856,46 @@ ev_view_accessible_set_selection (AtkText *text,
        return retval;
 }
 
+#if ATK_CHECK_VERSION (2, 11, 3)
+static gint
+ev_view_accessible_get_page_count (AtkDocument *atk_document)
+{
+       EvDocument *ev_document;
+       EvViewAccessiblePrivate* priv;
+
+       g_return_val_if_fail (EV_IS_VIEW_ACCESSIBLE (atk_document), -1);
+
+       priv = EV_VIEW_ACCESSIBLE (atk_document)->priv;
+       ev_document = ev_document_model_get_document (priv->model);
+
+       return ev_document == NULL ? -1 : ev_document_get_n_pages (ev_document);
+}
+
+static gint
+ev_view_accessible_get_current_page_number (AtkDocument *atk_document)
+{
+       GtkWidget *widget;
+
+       g_return_val_if_fail (EV_IS_VIEW_ACCESSIBLE (atk_document), -1);
+
+       widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (atk_document));
+       if (widget == NULL)
+               return -1;
+
+       /* +1 as user starts to count on 1, but evince starts on 0 */
+       return get_relevant_page (EV_VIEW (widget)) + 1;
+}
+#endif
+
+static void
+ev_view_accessible_document_iface_init (AtkDocumentIface *iface)
+{
+#if ATK_CHECK_VERSION (2, 11, 3)
+       iface->get_current_page_number = ev_view_accessible_get_current_page_number;
+       iface->get_page_count = ev_view_accessible_get_page_count;
+#endif
+}
+
 static void
 ev_view_accessible_text_iface_init (AtkTextIface * iface)
 {
@@ -1098,6 +1140,10 @@ ev_view_accessible_cursor_moved (EvView *view,
        if (priv->previous_cursor_page != page) {
                priv->previous_cursor_page = page;
                clear_cache (accessible);
+#if ATK_CHECK_VERSION (2, 11, 2)
+               /* +1 as user start to count on 1, but evince starts on 0 */
+               g_signal_emit_by_name (accessible, "page-changed", page + 1);
+#endif
        }
 
        g_signal_emit_by_name (accessible, "text-caret-moved", offset);
@@ -1117,6 +1163,14 @@ page_changed_cb (EvDocumentModel  *model,
                 EvViewAccessible *accessible)
 {
        clear_cache (accessible);
+
+#if ATK_CHECK_VERSION (2, 11, 2)
+       EvView *view;
+
+       view = EV_VIEW (gtk_accessible_get_widget (GTK_ACCESSIBLE (accessible)));
+       if (!ev_view_is_caret_navigation_enabled (view))
+               g_signal_emit_by_name (accessible, "page-changed", new_page + 1);
+#endif
 }
 
 static void
@@ -1130,6 +1184,15 @@ document_changed_cb (EvDocumentModel  *model,
                return;
 
        clear_cache (accessible);
+
+       /* Inside this callback the document is already loaded. We
+        * don't have here an "just before" and "just after"
+        * signal. We emit both in a row, as usual ATs uses reload to
+        * know that current content has changed, and load-complete to
+        * know that the content is already available.
+        */
+       g_signal_emit_by_name (accessible, "reload");
+       g_signal_emit_by_name (accessible, "load-complete");
 }
 
 void