[sysprof] Eliminate as many signal emissions as we can from footreestore.c

[Søren Sandmann Pedersen <ssp src gnome org>]

commit 6849c1472d415ecc3612b80c5301458441acee5b
Author: Søren Sandmann Pedersen <ssp redhat com>
Date:   Mon Aug 17 05:45:46 2009 -0400

    Eliminate as many signal emissions as we can from footreestore.c

 footreestore.c  |   59 +++++++++++++++++++++++++++++++++++-------------------
 footreestore.h  |    6 +++++
 treeviewutils.c |   30 ++++++++++++++++-----------
 3 files changed, 62 insertions(+), 33 deletions(-)
---
diff --git a/footreestore.c b/footreestore.c
index 1629e6c..e2ab611 100644
--- a/footreestore.c
+++ b/footreestore.c
@@ -233,6 +233,11 @@ foo_tree_store_init (FooTreeStore *tree_store)
   tree_store->sort_list = NULL;
   tree_store->sort_column_id = GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID;
   tree_store->columns_dirty = FALSE;
+
+  tree_store->row_changed_id = g_signal_lookup ("row_changed", GTK_TYPE_TREE_MODEL);
+  tree_store->row_inserted_id = g_signal_lookup ("row_inserted", GTK_TYPE_TREE_MODEL);
+  tree_store->row_has_child_toggled_id = g_signal_lookup ("row_has_child_toggled", GTK_TYPE_TREE_MODEL);
+  tree_store->rows_reordered_id = g_signal_lookup ("rows_reordered", GTK_TYPE_TREE_MODEL);
 }
 
 /**
@@ -1059,11 +1064,13 @@ foo_tree_store_set_valist (FooTreeStore *tree_store,
 
   if (emit_signal)
     {
-      GtkTreePath *path;
-
-      path = foo_tree_store_get_path (GTK_TREE_MODEL (tree_store), iter);
-      gtk_tree_model_row_changed (GTK_TREE_MODEL (tree_store), path, iter);
-      gtk_tree_path_free (path);
+      if (g_signal_has_handler_pending (tree_store, tree_store->row_changed_id, 0, FALSE))
+	{
+	  GtkTreePath *path;
+	  path = foo_tree_store_get_path (GTK_TREE_MODEL (tree_store), iter);
+	  gtk_tree_model_row_changed (GTK_TREE_MODEL (tree_store), path, iter);
+	  gtk_tree_path_free (path);
+	}
     }
 }
 
@@ -1182,7 +1189,6 @@ foo_tree_store_insert (FooTreeStore *tree_store,
 		       GtkTreeIter  *parent,
 		       gint          position)
 {
-  GtkTreePath *path;
   GNode *parent_node;
   GNode *new_node;
 
@@ -1204,20 +1210,26 @@ foo_tree_store_insert (FooTreeStore *tree_store,
   iter->user_data = new_node;
   g_node_insert (parent_node, position, new_node);
 
-  path = foo_tree_store_get_path (GTK_TREE_MODEL (tree_store), iter);
-  gtk_tree_model_row_inserted (GTK_TREE_MODEL (tree_store), path, iter);
-
-  if (parent_node != tree_store->root)
+  if (g_signal_has_handler_pending (tree_store, tree_store->row_inserted_id, 0, FALSE) ||
+      g_signal_has_handler_pending (tree_store, tree_store->row_has_child_toggled_id, 0, FALSE))
     {
-      if (new_node->prev == NULL && new_node->next == NULL)
-        {
-          gtk_tree_path_up (path);
-          gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (tree_store), path, parent);
-        }
+      GtkTreePath *path;
+  
+      path = foo_tree_store_get_path (GTK_TREE_MODEL (tree_store), iter);
+      gtk_tree_model_row_inserted (GTK_TREE_MODEL (tree_store), path, iter);
+  
+      if (parent_node != tree_store->root)
+	{
+	  if (new_node->prev == NULL && new_node->next == NULL)
+	    {
+	      gtk_tree_path_up (path);
+	      gtk_tree_model_row_has_child_toggled (GTK_TREE_MODEL (tree_store), path, parent);
+	    }
+	}
+      
+      gtk_tree_path_free (path);
     }
 
-  gtk_tree_path_free (path);
-
   validate_tree ((FooTreeStore*)tree_store);
 }
 
@@ -2850,10 +2862,15 @@ foo_tree_store_sort_helper (FooTreeStore *tree_store,
 
   iter.stamp = tree_store->stamp;
   iter.user_data = parent;
-  path = foo_tree_store_get_path (GTK_TREE_MODEL (tree_store), &iter);
-  gtk_tree_model_rows_reordered (GTK_TREE_MODEL (tree_store),
-				 path, &iter, new_order);
-  gtk_tree_path_free (path);
+
+  if (g_signal_has_handler_pending (tree_store, tree_store->row_inserted_id, 0, FALSE))
+    {
+      path = foo_tree_store_get_path (GTK_TREE_MODEL (tree_store), &iter);
+      gtk_tree_model_rows_reordered (GTK_TREE_MODEL (tree_store),
+				     path, &iter, new_order);
+      gtk_tree_path_free (path);
+    }
+  
   g_free (new_order);
   g_array_free (sort_array, TRUE);
 
diff --git a/footreestore.h b/footreestore.h
index a79e5da..bac0312 100644
--- a/footreestore.h
+++ b/footreestore.h
@@ -56,6 +56,12 @@ struct _FooTreeStore
   GtkTreeIterCompareFunc GSEAL (default_sort_func);
   gpointer GSEAL (default_sort_data);
   GDestroyNotify GSEAL (default_sort_destroy);
+
+  guint row_changed_id;
+  guint row_inserted_id;
+  guint row_has_child_toggled_id;
+  guint rows_reordered_id;
+  
   guint GSEAL (columns_dirty) : 1;
 };
 
diff --git a/treeviewutils.c b/treeviewutils.c
index 99b8807..7511daf 100644
--- a/treeviewutils.c
+++ b/treeviewutils.c
@@ -256,26 +256,32 @@ tree_view_set_model_with_default_sort (GtkTreeView  *view,
 				       int           model_column,
 				       GtkSortType   default_sort)
 {
-    gboolean	     was_sorted = FALSE;
-    int		     old_column;
-    GtkSortType	     old_type;
+    int		     column;
+    GtkSortType	     type;
     GtkTreeSortable *old_model;
     GtkAdjustment   *adjustment;
     
     old_model = GTK_TREE_SORTABLE (gtk_tree_view_get_model (view));
     
-    if (old_model)
+    if (!(old_model && gtk_tree_sortable_get_sort_column_id (
+	      GTK_TREE_SORTABLE (old_model), &column, &type)))
     {
-	was_sorted = gtk_tree_sortable_get_sort_column_id (
-	    GTK_TREE_SORTABLE (old_model), &old_column, &old_type);
+	column = model_column;
+	type = default_sort;
     }
-    
+
+    /* Setting the sort column here prevents the "rows_reordered"
+     * signal from being emitted when the model is attached to
+     * a treeview. This is desirable because at that point there
+     * is a handler attached, which means the signal will actually
+     * be emitted.
+     */
+    gtk_tree_sortable_set_sort_column_id (
+	GTK_TREE_SORTABLE (model), column, type);
+
     gtk_tree_view_set_model (view, model);
-    
-    if (was_sorted)
-	tree_view_set_sort_column (view, old_column, old_type);
-    else
-	tree_view_set_sort_column (view, model_column, default_sort);
+
+    tree_view_set_sort_column (view, column, type);
     
     /* Workaround for GTK+ crack, see bug 405625 */
     adjustment = gtk_tree_view_get_vadjustment (view);