[libdazzle] tree-node: add support for setting foreground color

[Christian Hergert <chergert src gnome org>]

commit 8226d617fa4fba32b1fc747015187c46ca9d41b0
Author: Christian Hergert <chergert redhat com>
Date:   Sun Dec 10 23:59:04 2017 -0800

    tree-node: add support for setting foreground color
    
    This allows specifying a foreground color for a row. Currently,
    that only supports the text field. We may want something in the
    future that allows more control over the pango attr list, but
    I'd prefer to avoid the attr lists for now.

 src/tree/dzl-tree-node.c |   62 ++++++++++++++++++++++++++++++++++++++++++---
 src/tree/dzl-tree-node.h |    5 +++
 src/tree/dzl-tree.c      |    4 ++-
 3 files changed, 65 insertions(+), 6 deletions(-)
---
diff --git a/src/tree/dzl-tree-node.c b/src/tree/dzl-tree-node.c
index 7f033aa..16f4e18 100644
--- a/src/tree/dzl-tree-node.c
+++ b/src/tree/dzl-tree-node.c
@@ -19,6 +19,7 @@
 #define G_LOG_DOMAIN "dzl-tree-node"
 
 #include <glib/gi18n.h>
+#include <string.h>
 
 #include "tree/dzl-tree.h"
 #include "tree/dzl-tree-node.h"
@@ -34,18 +35,21 @@ struct _DzlTreeNode
   GObject           *item;
   gchar             *text;
   DzlTree           *tree;
+
   GIcon             *gicon;
   GList             *emblems;
-
   GQuark             icon_name;
   GQuark             expanded_icon_name;
 
-  guint              use_markup : 1;
-  guint              needs_build_children : 1;
-  guint              is_dummy : 1;
+  GdkRGBA            foreground_rgba;
+
   guint              children_possible : 1;
-  guint              use_dim_label : 1;
+  guint              is_dummy : 1;
+  guint              foreground_rgba_set : 1;
+  guint              needs_build_children : 1;
   guint              reset_on_collapse : 1;
+  guint              use_dim_label : 1;
+  guint              use_markup : 1;
 };
 
 typedef struct
@@ -1312,3 +1316,51 @@ dzl_tree_node_nth_child (DzlTreeNode *self,
 
   return NULL;
 }
+
+/**
+ * dzl_tree_node_get_foreground_rgba:
+ * @self: a #DzlTreeNode
+ *
+ * Gets the foreground-rgba to use for row text.
+ *
+ * If %NULL, the default foreground color should be used.
+ *
+ * Returns: (nullable) (transfer none): A #GdkRGBA or %NULL
+ *
+ * Since: 3.28
+ */
+const GdkRGBA *
+dzl_tree_node_get_foreground_rgba (DzlTreeNode *self)
+{
+  g_return_val_if_fail (DZL_IS_TREE_NODE (self), NULL);
+
+  if (self->foreground_rgba_set)
+    return &self->foreground_rgba;
+
+  return NULL;
+}
+
+/**
+ * dzl_tree_node_set_foreground_rgba:
+ * @self: a #DzlTreeNode
+ * @foreground_rgba: (nullable): A #GdkRGBA or %NULL
+ *
+ * Sets the foreground-rgba to be used by the row text.
+ *
+ * If @foreground_rgba is %NULL, the value is reset to the default.
+ *
+ * Since: 3.28
+ */
+void
+dzl_tree_node_set_foreground_rgba (DzlTreeNode   *self,
+                                   const GdkRGBA *foreground_rgba)
+{
+  g_return_if_fail (DZL_IS_TREE_NODE (self));
+
+  if (foreground_rgba != NULL)
+    self->foreground_rgba = *foreground_rgba;
+  else
+    memset (&self->foreground_rgba, 0, sizeof self->foreground_rgba);
+
+  self->foreground_rgba_set = !!foreground_rgba;
+}
diff --git a/src/tree/dzl-tree-node.h b/src/tree/dzl-tree-node.h
index 096b12c..40d39f0 100644
--- a/src/tree/dzl-tree-node.h
+++ b/src/tree/dzl-tree-node.h
@@ -128,6 +128,11 @@ gboolean        dzl_tree_node_get_reset_on_collapse (DzlTreeNode            *sel
 DZL_AVAILABLE_IN_3_28
 void            dzl_tree_node_set_reset_on_collapse (DzlTreeNode            *self,
                                                      gboolean                reset_on_collapse);
+DZL_AVAILABLE_IN_3_28
+const GdkRGBA  *dzl_tree_node_get_foreground_rgba   (DzlTreeNode            *self);
+DZL_AVAILABLE_IN_3_28
+void            dzl_tree_node_set_foreground_rgba   (DzlTreeNode            *self,
+                                                     const GdkRGBA          *foreground_rgba);
 
 G_END_DECLS
 
diff --git a/src/tree/dzl-tree.c b/src/tree/dzl-tree.c
index 3cbe798..6662687 100644
--- a/src/tree/dzl-tree.c
+++ b/src/tree/dzl-tree.c
@@ -460,7 +460,7 @@ text_func (GtkCellLayout   *cell_layout,
 
   if (node)
     {
-      GdkRGBA *rgba = NULL;
+      const GdkRGBA *rgba = NULL;
       const gchar *text;
       gboolean use_markup;
 
@@ -469,6 +469,8 @@ text_func (GtkCellLayout   *cell_layout,
 
       if (dzl_tree_node_get_use_dim_label (node))
         rgba = &priv->dim_foreground;
+      else
+        rgba = dzl_tree_node_get_foreground_rgba (node);
 
       g_object_set (cell,
                     use_markup ? "markup" : "text", text,