EogThumbView: Set icon view columns to the real number of images

GtkIconView's layout code was redone in gtk+-3.4.3 and 3.4.4
breaking EogThumbView which would scale the thumbnails so small that
the thumbview would not be shown itself in single row mode.
This should work with gtk+-3.4.2 and earlier as well.

taken from:
https://git.gnome.org/browse/eog/commit/?id=888b5ed

1 files changed, 107 insertions, 0 deletions

diff --git a/src/eom-thumb-view.c b/src/eom-thumb-view.c
index 1a8f4f1..aba4eba 100644
--- a/src/eom-thumb-view.c
+++ b/src/eom-thumb-view.c
@@ -63,6 +63,8 @@ static void      eom_thumb_view_popup_menu          (EomThumbView      *widget,
 						     GdkEventButton    *event);
 
 #if GTK_CHECK_VERSION (3, 4, 3)
+static void      eom_thumb_view_update_columns (EomThumbView *view);
+
 G_DEFINE_TYPE_WITH_CODE (EomThumbView, eom_thumb_view, GTK_TYPE_ICON_VIEW,
 						 G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL));
 #endif
@@ -100,6 +102,9 @@ struct _EomThumbViewPrivate {
 
 #if GTK_CHECK_VERSION (3, 4, 3)
 	GtkOrientation orientation;
+	gint n_images;
+	gulong image_add_id;
+	gulong image_removed_id;
 #endif
 };
 
@@ -172,12 +177,29 @@ static void
 eom_thumb_view_dispose (GObject *object)
 {
 	EomThumbViewPrivate *priv = EOM_THUMB_VIEW (object)->priv;
+#if GTK_CHECK_VERSION (3, 4, 3)
+	GtkTreeModel *model;
+#endif
 
 	if (priv->visible_range_changed_id != 0) {
 		g_source_remove (priv->visible_range_changed_id);
 		priv->visible_range_changed_id = 0;
 	}
 
+#if GTK_CHECK_VERSION (3, 4, 3)
+	model = gtk_icon_view_get_model (GTK_ICON_VIEW (object));
+
+	if (model && priv->image_add_id != 0) {
+		g_signal_handler_disconnect (model, priv->image_add_id);
+		priv->image_add_id = 0;
+	}
+
+	if (model && priv->image_removed_id) {
+		g_signal_handler_disconnect (model, priv->image_removed_id);
+		priv->image_removed_id = 0;
+	}
+#endif
+
 	G_OBJECT_CLASS (eom_thumb_view_parent_class)->dispose (object);
 }
 
@@ -242,6 +264,9 @@ eom_thumb_view_set_property (GObject      *object,
 	{
 	case PROP_ORIENTATION:
 		view->priv->orientation = g_value_get_enum (value);
+#if GTK_CHECK_VERSION (3, 4, 3)
+		eom_thumb_view_update_columns (view);
+#endif
 		break;
 	default:
 		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@@ -684,6 +709,10 @@ eom_thumb_view_init (EomThumbView *thumbview)
 	thumbview->priv = EOM_THUMB_VIEW_GET_PRIVATE (thumbview);
 
 	thumbview->priv->visible_range_changed_id = 0;
+#if GTK_CHECK_VERSION (3, 4, 3)
+	thumbview->priv->image_add_id = 0;
+	thumbview->priv->image_removed_id = 0;
+#endif
 }
 
 /**
@@ -703,6 +732,45 @@ eom_thumb_view_new (void)
 	return GTK_WIDGET (thumbview);
 }
 
+#if GTK_CHECK_VERSION (3, 4, 3)
+static void
+eom_thumb_view_update_columns (EomThumbView *view)
+{
+	EomThumbViewPrivate *priv;
+
+	g_return_if_fail (EOM_IS_THUMB_VIEW (view));
+
+	priv = view->priv;
+
+	if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
+			gtk_icon_view_set_columns (GTK_ICON_VIEW (view),
+			                           priv->n_images);
+}
+
+static void
+eom_thumb_view_row_inserted_cb (GtkTreeModel    *tree_model,
+                                GtkTreePath     *path,
+                                GtkTreeIter     *iter,
+                                EomThumbView    *view)
+{
+	EomThumbViewPrivate *priv = view->priv;
+
+	priv->n_images++;
+	eom_thumb_view_update_columns (view);
+}
+
+static void
+eom_thumb_view_row_deleted_cb (GtkTreeModel    *tree_model,
+                               GtkTreePath     *path,
+                               EomThumbView    *view)
+{
+	EomThumbViewPrivate *priv = view->priv;
+
+	priv->n_images--;
+	eom_thumb_view_update_columns (view);
+}
+#endif
+
 /**
  * eom_thumb_view_set_model:
  * @thumbview: A #EomThumbView.
@@ -716,13 +784,52 @@ void
 eom_thumb_view_set_model (EomThumbView *thumbview, EomListStore *store)
 {
 	gint index;
+#if GTK_CHECK_VERSION (3, 4, 3)
+	EomThumbViewPrivate *priv;
+	GtkTreeModel *existing;
+#endif
 
 	g_return_if_fail (EOM_IS_THUMB_VIEW (thumbview));
 	g_return_if_fail (EOM_IS_LIST_STORE (store));
 
+#if GTK_CHECK_VERSION (3, 4, 3)
+	priv = thumbview->priv;
+
+	existing = gtk_icon_view_get_model (GTK_ICON_VIEW (thumbview));
+
+	if (existing != NULL) {
+		if (priv->image_add_id != 0) {
+			g_signal_handler_disconnect (existing,
+			                             priv->image_add_id);
+		}
+		if (priv->image_removed_id != 0) {
+			g_signal_handler_disconnect (existing,
+			                             priv->image_removed_id);
+
+		}
+	}
+
+	priv->image_add_id = g_signal_connect (G_OBJECT (store), "row-inserted",
+	                            G_CALLBACK (eom_thumb_view_row_inserted_cb),
+	                            thumbview);
+	priv->image_removed_id = g_signal_connect (G_OBJECT (store),
+	                             "row-deleted",
+	                             G_CALLBACK (eom_thumb_view_row_deleted_cb),
+	                             thumbview);
+
+	thumbview->priv->n_images = eom_list_store_length (store);
+#endif
+
 	index = eom_list_store_get_initial_pos (store);
 
+#if GTK_CHECK_VERSION (3, 4, 3)
+	gtk_icon_view_set_model (GTK_ICON_VIEW (thumbview),
+	                         GTK_TREE_MODEL (store));
+
+	eom_thumb_view_update_columns (thumbview);
+#else
 	gtk_icon_view_set_model (GTK_ICON_VIEW (thumbview), GTK_TREE_MODEL (store));
+#endif
 
 	if (index >= 0) {
 		GtkTreePath *path = gtk_tree_path_new_from_indices (index, -1);