[evince] libview: "<Ctrl>Home/End" move the caret to the start/end of the document

[Carlos Garcia Campos <carlosgc src gnome org>]

commit dd62504bb3febbc52d223a27171951a920625024
Author: Antia Puentes <apuentes igalia com>
Date:   Wed Jul 23 16:51:33 2014 +0200

    libview: "<Ctrl>Home/End" move the caret to the start/end of the document
    
    https://bugzilla.gnome.org/show_bug.cgi?id=724273

 libview/ev-view.c |   57 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 55 insertions(+), 2 deletions(-)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index 3c5eea6..4c346e9 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -3498,6 +3498,29 @@ ev_view_pend_cursor_blink (EvView *view)
                                                                 (GSourceFunc)blink_cb, view);
 }
 
+static void
+preload_pages_for_caret_navigation (EvView *view)
+{
+       gint n_pages;
+
+       if (!view->document)
+               return;
+
+       /* Upload to the cache the first and last pages,
+        * this information is needed to position the cursor
+        * in the beginning/end of the document, for example
+        * when pressing <Ctr>Home/End
+        */
+       n_pages = ev_document_get_n_pages (view->document);
+
+       /* For documents with at least 3 pages, those are already cached anyway */
+       if (n_pages > 0 && n_pages <= 3)
+               return;
+
+       ev_page_cache_ensure_page (view->page_cache, 0);
+       ev_page_cache_ensure_page (view->page_cache, n_pages - 1);
+}
+
 /**
  * ev_view_supports_caret_navigation:
  * @view: a #EvView
@@ -3538,6 +3561,9 @@ ev_view_set_caret_navigation_enabled (EvView   *view,
 
        if (view->caret_enabled != enabled) {
                view->caret_enabled = enabled;
+               if (view->caret_enabled)
+                       preload_pages_for_caret_navigation (view);
+
                ev_view_check_cursor_blink (view);
 
                if (cursor_is_in_visible_page (view))
@@ -5366,6 +5392,23 @@ cursor_go_to_previous_page (EvView *view)
 }
 
 static gboolean
+cursor_go_to_document_start (EvView *view)
+{
+       view->cursor_page = 0;
+       return cursor_go_to_page_start (view);
+}
+
+static gboolean
+cursor_go_to_document_end (EvView *view)
+{
+       if (!view->document)
+               return FALSE;
+
+       view->cursor_page = ev_document_get_n_pages (view->document) - 1;
+       return cursor_go_to_page_end (view);
+}
+
+static gboolean
 cursor_backward_char (EvView *view)
 {
        PangoLogAttr *log_attrs = NULL;
@@ -5671,6 +5714,12 @@ ev_view_move_cursor (EvView         *view,
                else if (count < 0)
                        cursor_go_to_line_start (view);
                break;
+       case GTK_MOVEMENT_BUFFER_ENDS:
+               if (count > 0)
+                       cursor_go_to_document_end (view);
+               else if (count < 0)
+                       cursor_go_to_document_start (view);
+               break;
        default:
                g_assert_not_reached ();
        }
@@ -6861,6 +6910,8 @@ ev_view_class_init (EvViewClass *class)
        add_move_binding_keypad (binding_set, GDK_KEY_Down,  0, GTK_MOVEMENT_DISPLAY_LINES, 1);
        add_move_binding_keypad (binding_set, GDK_KEY_Home,  0, GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);
        add_move_binding_keypad (binding_set, GDK_KEY_End,   0, GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);
+       add_move_binding_keypad (binding_set, GDK_KEY_Home,  GDK_CONTROL_MASK, GTK_MOVEMENT_BUFFER_ENDS, -1);
+       add_move_binding_keypad (binding_set, GDK_KEY_End,   GDK_CONTROL_MASK, GTK_MOVEMENT_BUFFER_ENDS, 1);
 
         add_scroll_binding_keypad (binding_set, GDK_KEY_Left,  0, GTK_SCROLL_STEP_BACKWARD, 
GTK_ORIENTATION_HORIZONTAL);
         add_scroll_binding_keypad (binding_set, GDK_KEY_Right, 0, GTK_SCROLL_STEP_FORWARD, 
GTK_ORIENTATION_HORIZONTAL);
@@ -7255,7 +7306,10 @@ ev_view_document_changed_cb (EvDocumentModel *model,
 
                        ev_view_set_loading (view, FALSE);
                        setup_caches (view);
-                }
+
+                       if (view->caret_enabled)
+                               preload_pages_for_caret_navigation (view);
+               }
 
                current_page = ev_document_model_get_page (model);
                if (view->current_page != current_page) {
@@ -7264,7 +7318,6 @@ ev_view_document_changed_cb (EvDocumentModel *model,
                        view->pending_scroll = SCROLL_TO_KEEP_POSITION;
                        gtk_widget_queue_resize (GTK_WIDGET (view));
                }
-
                view_update_scale_limits (view);
        }
 }