[gtk/dnd-gestures-2] dragicon: Add docs

[Matthias Clasen <matthiasc src gnome org>]

commit a51ee20ed9700c4632ad3abfa2f311624ea18b14
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 9 00:50:33 2020 -0500

    dragicon: Add docs

 gtk/gtkdragicon.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
---
diff --git a/gtk/gtkdragicon.c b/gtk/gtkdragicon.c
index 48ac83d3a1..ae36e1e1dc 100644
--- a/gtk/gtkdragicon.c
+++ b/gtk/gtkdragicon.c
@@ -27,6 +27,21 @@
 #include "gtkpicture.h"
 
 
+/**
+ * SECTION:gtkdragicon
+ * @Short_description: A toplevel to use as drag icon
+ * @Title: GtkDragIcon
+ *
+ * GtkDragIcon is a #GtkNative implementation with the sole purpose
+ * to serve as a drag icon during DND operations. A drag icon moves
+ * with the pointer during a drag operation and is destroyed when
+ * the drag ends.
+ *
+ * To set up a drag icon and associate it with an ongoing drag operation,
+ * use gtk_drag_icon_set_from_paintable(). It is also possible to create
+ * a GtkDragIcon with gtk_drag_icon_new_for_drag(() and populate it
+ * with widgets yourself.
+ */
 struct _GtkDragIcon
 {
   GtkWidget parent_instance;
@@ -376,6 +391,14 @@ gtk_drag_icon_new (void)
   return g_object_new (GTK_TYPE_DRAG_ICON, NULL);
 }
 
+/**
+ * gtk_drag_icon_new_for_drag:
+ * @drag: a #GtkDrag
+ *
+ * Creates a #GtkDragIcon and associates it with the drag operation.
+ *
+ * Returns: the new #GtkDragIcon
+ */
 GtkWidget *
 gtk_drag_icon_new_for_drag (GdkDrag *drag)
 {
@@ -390,6 +413,17 @@ gtk_drag_icon_new_for_drag (GdkDrag *drag)
   return icon;
 }
 
+/**
+ * gtk_drag_icon_set_from_paintable:
+ * @drag: a #GdkDrag
+ * @paintable: a #GdkPaintable to display
+ * @hot_x: X coordinate of the hotspot
+ * @hot_y: Y coordinate of the hotspot
+ *
+ * Creates a #GtkDragIcon that shows @paintable, and associates
+ * it with the drag operation. The hotspot position on the paintable
+ * is aligned with the hotspot of the cursor.
+ */
 void
 gtk_drag_icon_set_from_paintable (GdkDrag      *drag,
                                   GdkPaintable *paintable,