[gthumb] grid view: update the cursor position when the model changes

[Paolo Bacchilega <paobac src gnome org>]

commit f16ba104f9fa8a809be0d321addc344a1dadafd1
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Sep 11 09:54:41 2016 +0200

    grid view: update the cursor position when the model changes

 gthumb/gth-grid-view.c |   33 ++++++++++++++++++++-------------
 1 files changed, 20 insertions(+), 13 deletions(-)
---
diff --git a/gthumb/gth-grid-view.c b/gthumb/gth-grid-view.c
index eca433e..e6db2a6 100644
--- a/gthumb/gth-grid-view.c
+++ b/gthumb/gth-grid-view.c
@@ -1798,23 +1798,11 @@ gth_grid_view_draw (GtkWidget *widget,
 }
 
 
-static void
-_gth_grid_view_keep_focus_consistent (GthGridView *self)
-{
-       if (self->priv->focused_item > self->priv->n_items - 1)
-               self->priv->focused_item = - 1;
-}
-
-
 static gboolean
 gth_grid_view_focus_in (GtkWidget     *widget,
                        GdkEventFocus *event)
 {
-       GthGridView *self = GTH_GRID_VIEW (widget);
-
-       _gth_grid_view_keep_focus_consistent (self);
        gtk_widget_queue_draw (widget);
-
        return TRUE;
 }
 
@@ -2272,9 +2260,15 @@ model_row_deleted_cb (GtkTreeModel *tree_model,
                g_list_free (selected_link);
        }
 
+       /* update the cursor position */
+
+       if (pos < self->priv->focused_item)
+               self->priv->focused_item--;
+       else if (pos == self->priv->focused_item)
+               self->priv->focused_item = -1;
+
        /* relayout from the minimum changed position */
 
-       _gth_grid_view_keep_focus_consistent (self);
        _gth_grid_view_queue_relayout_from_position (self, pos);
 
        gth_grid_view_item_unref (GTH_GRID_VIEW_ITEM (link->data));
@@ -2319,6 +2313,11 @@ model_row_inserted_cb (GtkTreeModel *tree_model,
                        scan->data = GINT_TO_POINTER (selected_pos + 1);
        }
 
+       /* update the cursor position */
+
+       if (pos <= self->priv->focused_item)
+               self->priv->focused_item++;
+
        /* relayout from the minimum changed position */
 
        _gth_grid_view_queue_relayout_from_position (self, pos);
@@ -2339,6 +2338,7 @@ model_rows_reordered_cb (GtkTreeModel *tree_model,
        GList       *items;
        int          i;
        int          min_changed_pos;
+       gboolean     focused_updated = FALSE;
        GList       *scan;
 
        /* change the order of the items list */
@@ -2353,6 +2353,13 @@ model_rows_reordered_cb (GtkTreeModel *tree_model,
                if ((min_changed_pos == -1) && (old_pos != i))
                        min_changed_pos = i;
 
+               /* update the cursor position */
+
+               if (! focused_updated && (old_pos == self->priv->focused_item)) {
+                       self->priv->focused_item = i;
+                       focused_updated = TRUE;
+               }
+
                link = g_list_nth (self->priv->items, old_pos);
                g_return_if_fail (link != NULL);
                items = g_list_prepend (items, link->data);