Add more defensive code to avoid accessing GtkIconView's cell area before it exists.

Adding these cases here to cater to icon view subclasses that want to
access icon view APIs from the instance structure initializer instead
of properly waiting for the super class to initialize and adding renderers
from the ->constructor() vfunc.

diff --git a/gtk/gtkiconview.c b/gtk/gtkiconview.c
index 3d8d606b9bb3bb03f6580ae6ea9974c9a150a4ab..44d0ed5761b8ead112a61e83a549c11352a87559 100644 (file)
--- a/gtk/gtkiconview.c
+++ b/gtk/gtkiconview.c
@@ -392,6 +392,8 @@ static void                 gtk_icon_view_remove_editable                (GtkCel
 static void                 gtk_icon_view_context_changed                (GtkCellAreaContext     *context,
                                                                          GParamSpec             *pspec,
                                                                          GtkIconView            *icon_view);
+static void                 update_text_cell                             (GtkIconView            *icon_view);
+static void                 update_pixbuf_cell                           (GtkIconView            *icon_view);
 
 /* Source side drag signals */
 static void gtk_icon_view_drag_begin       (GtkWidget        *widget,
@@ -2884,11 +2886,14 @@ gtk_icon_view_invalidate_sizes (GtkIconView *icon_view)
                  (GFunc)gtk_icon_view_item_invalidate_size, NULL);
 
   /* Reset the context */
-  g_signal_handler_block (icon_view->priv->cell_area_context, 
-                         icon_view->priv->context_changed_id);
-  gtk_cell_area_context_reset (icon_view->priv->cell_area_context);
-  g_signal_handler_unblock (icon_view->priv->cell_area_context, 
-                           icon_view->priv->context_changed_id);
+  if (icon_view->priv->cell_area_context)
+    {
+      g_signal_handler_block (icon_view->priv->cell_area_context, 
+                             icon_view->priv->context_changed_id);
+      gtk_cell_area_context_reset (icon_view->priv->cell_area_context);
+      g_signal_handler_unblock (icon_view->priv->cell_area_context, 
+                               icon_view->priv->context_changed_id);
+    }
 
   /* Re-layout the items */
   gtk_icon_view_queue_layout (icon_view);
@@ -3258,7 +3263,12 @@ gtk_icon_view_row_changed (GtkTreeModel *model,
   if (gtk_tree_path_get_depth (path) > 1)
     return;
 
-  gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+  /* An icon view subclass might add it's own model and populate
+   * things at init() time instead of waiting for the constructor() 
+   * to be called 
+   */
+  if (icon_view->priv->cell_area)
+    gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
 
   /* Here we can use a "grow-only" strategy for optimization
    * and only invalidate a single item and queue a relayout
@@ -4121,6 +4131,9 @@ gtk_icon_view_ensure_cell_area (GtkIconView *icon_view,
   priv->context_changed_id =
     g_signal_connect (priv->cell_area_context, "notify",
                       G_CALLBACK (gtk_icon_view_context_changed), icon_view);
+
+  update_text_cell (icon_view);
+  update_pixbuf_cell (icon_view);
 }
 
 static GtkCellArea *
@@ -4881,6 +4894,9 @@ gtk_icon_view_get_model (GtkIconView *icon_view)
 static void
 update_text_cell (GtkIconView *icon_view)
 {
+  if (!icon_view->priv->cell_area)
+    return;
+
   if (icon_view->priv->text_column == -1 &&
       icon_view->priv->markup_column == -1)
     {
@@ -4931,6 +4947,9 @@ update_text_cell (GtkIconView *icon_view)
 static void
 update_pixbuf_cell (GtkIconView *icon_view)
 {
+  if (!icon_view->priv->cell_area)
+    return;
+
   if (icon_view->priv->pixbuf_column == -1)
     {
       if (icon_view->priv->pixbuf_cell != NULL)
@@ -5001,8 +5020,8 @@ gtk_icon_view_set_text_column (GtkIconView *icon_view,
       icon_view->priv->text_column = column;
     }
 
-
-  gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+  if (icon_view->priv->cell_area)
+    gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
 
   update_text_cell (icon_view);
 
@@ -5064,7 +5083,8 @@ gtk_icon_view_set_markup_column (GtkIconView *icon_view,
       icon_view->priv->markup_column = column;
     }
 
-  gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+  if (icon_view->priv->cell_area)
+    gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
 
   update_text_cell (icon_view);
 
@@ -5124,7 +5144,8 @@ gtk_icon_view_set_pixbuf_column (GtkIconView *icon_view,
       icon_view->priv->pixbuf_column = column;
     }
 
-  gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+  if (icon_view->priv->cell_area)
+    gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
 
   update_pixbuf_cell (icon_view);
 
@@ -5441,11 +5462,15 @@ gtk_icon_view_set_item_orientation (GtkIconView    *icon_view,
     {
       icon_view->priv->item_orientation = orientation;
 
-      if (GTK_IS_ORIENTABLE (icon_view->priv->cell_area))
-       gtk_orientable_set_orientation (GTK_ORIENTABLE (icon_view->priv->cell_area), 
-                                       icon_view->priv->item_orientation);
+      if (icon_view->priv->cell_area)
+       {
+         if (GTK_IS_ORIENTABLE (icon_view->priv->cell_area))
+           gtk_orientable_set_orientation (GTK_ORIENTABLE (icon_view->priv->cell_area), 
+                                           icon_view->priv->item_orientation);
+
+         gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+       }
 
-      gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
       gtk_icon_view_invalidate_sizes (icon_view);
 
       update_text_cell (icon_view);
@@ -5543,7 +5568,9 @@ gtk_icon_view_set_item_width (GtkIconView *icon_view,
     {
       icon_view->priv->item_width = item_width;
       
-      gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+      if (icon_view->priv->cell_area)
+       gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+
       gtk_icon_view_invalidate_sizes (icon_view);
       
       update_text_cell (icon_view);
@@ -5592,9 +5619,11 @@ gtk_icon_view_set_spacing (GtkIconView *icon_view,
     {
       icon_view->priv->spacing = spacing;
 
-      gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+      if (icon_view->priv->cell_area)
+       gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+
       gtk_icon_view_invalidate_sizes (icon_view);
-      
+
       g_object_notify (G_OBJECT (icon_view), "spacing");
     }  
 }
@@ -5637,9 +5666,11 @@ gtk_icon_view_set_row_spacing (GtkIconView *icon_view,
     {
       icon_view->priv->row_spacing = row_spacing;
 
-      gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+      if (icon_view->priv->cell_area)
+       gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+
       gtk_icon_view_invalidate_sizes (icon_view);
-      
+
       g_object_notify (G_OBJECT (icon_view), "row-spacing");
     }  
 }
@@ -5682,9 +5713,11 @@ gtk_icon_view_set_column_spacing (GtkIconView *icon_view,
     {
       icon_view->priv->column_spacing = column_spacing;
 
-      gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+      if (icon_view->priv->cell_area)
+       gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+
       gtk_icon_view_invalidate_sizes (icon_view);
-      
+
       g_object_notify (G_OBJECT (icon_view), "column-spacing");
     }  
 }
@@ -5728,9 +5761,11 @@ gtk_icon_view_set_margin (GtkIconView *icon_view,
     {
       icon_view->priv->margin = margin;
 
-      gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+      if (icon_view->priv->cell_area)
+       gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+
       gtk_icon_view_invalidate_sizes (icon_view);
-      
+
       g_object_notify (G_OBJECT (icon_view), "margin");
     }  
 }
@@ -5773,9 +5808,11 @@ gtk_icon_view_set_item_padding (GtkIconView *icon_view,
     {
       icon_view->priv->item_padding = item_padding;
 
-      gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+      if (icon_view->priv->cell_area)
+       gtk_cell_area_stop_editing (icon_view->priv->cell_area, TRUE);
+
       gtk_icon_view_invalidate_sizes (icon_view);
-      
+
       g_object_notify (G_OBJECT (icon_view), "item-padding");
     }  
 }