[libdazzle] tree: add support for expanded icon-names

[Christian Hergert <chergert src gnome org>]

commit 06131c2f3212691cb2c2f9d33225dc2fe7eebe24
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jul 21 23:21:55 2017 -0700

    tree: add support for expanded icon-names

 src/tree/dzl-tree-node.c    |   25 ++++++++++++++++++++++++-
 src/tree/dzl-tree-private.h |    1 +
 src/tree/dzl-tree.c         |   22 +++++++++++++++++++++-
 3 files changed, 46 insertions(+), 2 deletions(-)
---
diff --git a/src/tree/dzl-tree-node.c b/src/tree/dzl-tree-node.c
index c3225af..bef6a21 100644
--- a/src/tree/dzl-tree-node.c
+++ b/src/tree/dzl-tree-node.c
@@ -33,6 +33,7 @@ struct _DzlTreeNode
   gchar             *text;
   DzlTree           *tree;
   GQuark             icon_name;
+  GQuark             expanded_icon_name;
   GIcon             *gicon;
   GList             *emblems;
   guint              use_markup : 1;
@@ -53,6 +54,7 @@ G_DEFINE_TYPE (DzlTreeNode, dzl_tree_node, G_TYPE_INITIALLY_UNOWNED)
 enum {
   PROP_0,
   PROP_CHILDREN_POSSIBLE,
+  PROP_EXPANDED_ICON_NAME,
   PROP_ICON_NAME,
   PROP_GICON,
   PROP_ITEM,
@@ -710,6 +712,10 @@ dzl_tree_node_get_property (GObject    *object,
       g_value_set_boolean (value, dzl_tree_node_get_children_possible (node));
       break;
 
+    case PROP_EXPANDED_ICON_NAME:
+      g_value_set_string (value, _dzl_tree_node_get_expanded_icon (node));
+      break;
+
     case PROP_ICON_NAME:
       g_value_set_string (value, g_quark_to_string (node->icon_name));
       break;
@@ -761,6 +767,10 @@ dzl_tree_node_set_property (GObject      *object,
       dzl_tree_node_set_children_possible (node, g_value_get_boolean (value));
       break;
 
+    case PROP_EXPANDED_ICON_NAME:
+      node->expanded_icon_name = g_quark_from_string (g_value_get_string (value));
+      break;
+
     case PROP_ICON_NAME:
       dzl_tree_node_set_icon_name (node, g_value_get_string (value));
       break;
@@ -815,7 +825,12 @@ dzl_tree_node_class_init (DzlTreeNodeClass *klass)
                           FALSE,
                           (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 
-
+  properties [PROP_EXPANDED_ICON_NAME] =
+    g_param_spec_string ("expanded-icon-name",
+                         "Expanded Icon Name",
+                         "The icon-name to use when the row is expanded",
+                         NULL,
+                         (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 
   /**
    * DzlTreeNode:icon-name:
@@ -1157,3 +1172,11 @@ dzl_tree_node_is_root (DzlTreeNode *node)
 
   return node->parent == NULL;
 }
+
+const gchar *
+_dzl_tree_node_get_expanded_icon (DzlTreeNode *node)
+{
+  g_return_val_if_fail (DZL_IS_TREE_NODE (node), NULL);
+
+  return g_quark_to_string (node->expanded_icon_name);
+}
diff --git a/src/tree/dzl-tree-private.h b/src/tree/dzl-tree-private.h
index 99122f3..22ce170 100644
--- a/src/tree/dzl-tree-private.h
+++ b/src/tree/dzl-tree-private.h
@@ -51,6 +51,7 @@ void         _dzl_tree_node_set_tree           (DzlTreeNode    *node,
                                                 DzlTree        *tree);
 void         _dzl_tree_node_set_parent         (DzlTreeNode    *node,
                                                 DzlTreeNode    *parent);
+const gchar *_dzl_tree_node_get_expanded_icon  (DzlTreeNode    *node);
 gboolean     _dzl_tree_node_get_needs_build    (DzlTreeNode    *node);
 void         _dzl_tree_node_set_needs_build    (DzlTreeNode    *node,
                                                 gboolean        needs_build);
diff --git a/src/tree/dzl-tree.c b/src/tree/dzl-tree.c
index cc287b0..d16c25b 100644
--- a/src/tree/dzl-tree.c
+++ b/src/tree/dzl-tree.c
@@ -364,14 +364,34 @@ pixbuf_func (GtkCellLayout   *cell_layout,
 {
   g_autoptr(DzlTreeNode) node = NULL;
   g_autoptr(GIcon) old_icon = NULL;
+  DzlTree *self = data;
+  GtkTreePath *tree_path;
+  gboolean expanded;
   GIcon *icon;
 
   g_assert (GTK_IS_CELL_LAYOUT (cell_layout));
   g_assert (GTK_IS_CELL_RENDERER_PIXBUF (cell));
   g_assert (GTK_IS_TREE_MODEL (tree_model));
+  g_assert (DZL_IS_TREE (self));
   g_assert (iter != NULL);
 
   gtk_tree_model_get (tree_model, iter, 0, &node, -1);
+
+  tree_path = gtk_tree_model_get_path (tree_model, iter);
+  expanded = gtk_tree_view_row_expanded (GTK_TREE_VIEW (self), tree_path);
+  gtk_tree_path_free (tree_path);
+
+  if (expanded)
+    {
+      const gchar *icon_name = _dzl_tree_node_get_expanded_icon (node);
+
+      if (icon_name != NULL)
+        {
+          g_object_set (cell, "icon-name", icon_name, NULL);
+          return;
+        }
+    }
+
   icon = dzl_tree_node_get_gicon (node);
   g_object_get (cell, "gicon", &old_icon, NULL);
   if (icon != old_icon)
@@ -972,7 +992,7 @@ dzl_tree_init (DzlTree *self)
   priv->cell_pixbuf = cell;
   g_object_bind_property (self, "show-icons", cell, "visible", 0);
   gtk_cell_layout_pack_start (column, cell, FALSE);
-  gtk_cell_layout_set_cell_data_func (column, cell, pixbuf_func, NULL, NULL);
+  gtk_cell_layout_set_cell_data_func (column, cell, pixbuf_func, self, NULL);
 
   cell = g_object_new (GTK_TYPE_CELL_RENDERER_TEXT,
                        "ellipsize", PANGO_ELLIPSIZE_NONE,