[gnome-photos] organize-collection-model: Add the placeholder methods

[Debarshi Ray <debarshir src gnome org>]

commit 5affe97ae21397dd9d8ee1e0c47b0e20f1a82edf
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Apr 27 17:31:39 2012 +0200

    organize-collection-model: Add the placeholder methods

 src/photos-organize-collection-model.c |   70 ++++++++++++++++++++++++++++++++
 src/photos-organize-collection-model.h |    6 +++
 2 files changed, 76 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-organize-collection-model.c b/src/photos-organize-collection-model.c
index acbc82c..83094c9 100644
--- a/src/photos-organize-collection-model.c
+++ b/src/photos-organize-collection-model.c
@@ -27,6 +27,7 @@
 
 struct _PhotosOrganizeCollectionModelPrivate
 {
+  GtkTreeRowReference *placeholder_ref;
   PhotosBaseManager *manager;
   gulong coll_added_id;
   gulong coll_removed_id;
@@ -65,6 +66,17 @@ photos_organize_collection_model_dispose (GObject *object)
 
 
 static void
+photos_organize_collection_model_finalize (GObject *object)
+{
+  PhotosOrganizeCollectionModel *self = PHOTOS_ORGANIZE_COLLECTION_MODEL (object);
+
+  gtk_tree_row_reference_free (self->priv->placeholder_ref);
+
+  G_OBJECT_CLASS (photos_organize_collection_model_parent_class)->finalize (object);
+}
+
+
+static void
 photos_organize_collection_model_init (PhotosOrganizeCollectionModel *self)
 {
   PhotosOrganizeCollectionModelPrivate *priv;
@@ -99,6 +111,7 @@ photos_organize_collection_model_class_init (PhotosOrganizeCollectionModelClass
   GObjectClass *object_class = G_OBJECT_CLASS (class);
 
   object_class->dispose = photos_organize_collection_model_dispose;
+  object_class->finalize = photos_organize_collection_model_finalize;
 
   g_type_class_add_private (class, sizeof (PhotosOrganizeCollectionModelPrivate));
 }
@@ -111,6 +124,31 @@ photos_organize_collection_model_new (void)
 }
 
 
+GtkTreePath *
+photos_organize_collection_model_add_placeholder (PhotosOrganizeCollectionModel *self)
+{
+  PhotosOrganizeCollectionModelPrivate *priv = self->priv;
+  GtkTreeIter iter;
+  GtkTreePath *placeholder_path;
+
+  photos_organize_collection_model_remove_placeholder (self);
+
+  gtk_list_store_append (GTK_LIST_STORE (self), &iter);
+  gtk_list_store_set (GTK_LIST_STORE (self),
+                      &iter,
+                      PHOTOS_ORGANIZE_MODEL_ID, PHOTOS_COLLECTION_PLACEHOLDER_ID,
+                      PHOTOS_ORGANIZE_MODEL_NAME, "",
+                      PHOTOS_ORGANIZE_MODEL_STATE, PHOTOS_ORGANIZE_COLLECTION_STATE_ACTIVE,
+                      -1);
+
+  placeholder_path = gtk_tree_model_get_path (GTK_TREE_MODEL (self), &iter);
+  if (placeholder_path != NULL)
+    priv->placeholder_ref = gtk_tree_row_reference_new (GTK_TREE_MODEL (self), placeholder_path);
+
+  return placeholder_path;
+}
+
+
 void
 photos_organize_collection_model_destroy (PhotosOrganizeCollectionModel *self)
 {
@@ -128,3 +166,35 @@ photos_organize_collection_model_destroy (PhotosOrganizeCollectionModel *self)
       priv->coll_removed_id = 0;
     }
 }
+
+
+GtkTreePath *
+photos_organize_collection_model_forget_placeholder (PhotosOrganizeCollectionModel *self)
+{
+  PhotosOrganizeCollectionModelPrivate *priv = self->priv;
+  GtkTreePath *path;
+
+  path = gtk_tree_row_reference_get_path (priv->placeholder_ref);
+  gtk_tree_row_reference_free (priv->placeholder_ref);
+  priv->placeholder_ref = NULL;
+  return path;
+}
+
+
+void
+photos_organize_collection_model_remove_placeholder (PhotosOrganizeCollectionModel *self)
+{
+  PhotosOrganizeCollectionModelPrivate *priv = self->priv;
+  GtkTreeIter placeholder_iter;
+  GtkTreePath *placeholder_path;
+
+  if (priv->placeholder_ref == NULL)
+    return;
+
+  placeholder_path = gtk_tree_row_reference_get_path (priv->placeholder_ref);
+  if (gtk_tree_model_get_iter (GTK_TREE_MODEL (self), &placeholder_iter, placeholder_path))
+    gtk_list_store_remove (GTK_LIST_STORE (self), &placeholder_iter);
+
+  gtk_tree_row_reference_free (priv->placeholder_ref);
+  priv->placeholder_ref = NULL;
+}
diff --git a/src/photos-organize-collection-model.h b/src/photos-organize-collection-model.h
index 1c4de92..90abbd1 100644
--- a/src/photos-organize-collection-model.h
+++ b/src/photos-organize-collection-model.h
@@ -83,8 +83,14 @@ GType             photos_organize_collection_model_get_type               (void)
 
 GtkListStore     *photos_organize_collection_model_new                    (void);
 
+GtkTreePath      *photos_organize_collection_model_add_placeholder        (PhotosOrganizeCollectionModel *self);
+
 void              photos_organize_collection_model_destroy                (PhotosOrganizeCollectionModel *self);
 
+GtkTreePath      *photos_organize_collection_model_forget_placeholder     (PhotosOrganizeCollectionModel *self);
+
+void              photos_organize_collection_model_remove_placeholder     (PhotosOrganizeCollectionModel *self);
+
 G_END_DECLS
 
 #endif /* PHOTOS_ORGANIZE_COLLECTION_MODEL_H */