Make GtkDragIcon public

This is needed if we want to use gdk_drag_begin
for one-off drags, without a GtkDragSource.

gtk/gtk.h

@@ -91,6 +91,7 @@
 #include <gtk/gtkdebug.h>
 #include <gtk/gtkdialog.h>
 #include <gtk/gtkdragdest.h>
+#include <gtk/gtkdragicon.h>
 #include <gtk/gtkdragsource.h>
 #include <gtk/gtkdrawingarea.h>
 #include <gtk/gtkeditable.h>

gtk/gtkdragicon.c

@@ -23,6 +23,8 @@
 #include "gtkintl.h"
 #include "gtkwidgetprivate.h"
 #include "gtkcssnodeprivate.h"
+#include "gtknativeprivate.h"
+#include "gtkpicture.h"
 
 
 struct _GtkDragIcon
@@ -374,6 +376,44 @@ gtk_drag_icon_new (void)
   return g_object_new (GTK_TYPE_DRAG_ICON, NULL);
 }
 
+GtkWidget *
+gtk_drag_icon_new_for_drag (GdkDrag *drag)
+{
+  GtkWidget *icon;
+
+  g_return_val_if_fail (GDK_IS_DRAG (drag), NULL);
+
+  icon = g_object_new (GTK_TYPE_DRAG_ICON, NULL);
+
+  gtk_drag_icon_set_surface (GTK_DRAG_ICON (icon), gdk_drag_get_drag_surface (drag));
+
+  return icon;
+}
+
+void
+gtk_drag_icon_set_from_paintable (GdkDrag      *drag,
+                                  GdkPaintable *paintable,
+                                  int           hot_x,
+                                  int           hot_y)
+{
+  GtkWidget *icon;
+  GtkWidget *picture;
+
+  gdk_drag_set_hotspot (drag, hot_x, hot_y);
+
+  icon = gtk_drag_icon_new_for_drag (drag);
+
+  picture = gtk_picture_new_for_paintable (paintable);
+  gtk_picture_set_can_shrink (GTK_PICTURE (picture), FALSE);
+  gtk_container_add (GTK_CONTAINER (icon), picture);
+
+  g_object_set_data_full (G_OBJECT (drag),
+                          "icon",
+                          g_object_ref_sink (icon),
+                          (GDestroyNotify)gtk_widget_destroy);
+  gtk_widget_show (icon);
+}
+
 void
 gtk_drag_icon_set_surface (GtkDragIcon *icon,
                            GdkSurface  *surface)

gtk/gtkdragicon.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright © 2020 Matthias Clasen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte@gnome.org>
+ */
+
+#ifndef __GTK_DRAG_ICON_H__
+#define __GTK_DRAG_ICON_H__
+
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gio/gio.h>
+#include <gtk/gtkwidget.h>
+#include <gtk/gtkcontainer.h>
+
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_DRAG_ICON (gtk_drag_icon_get_type ())
+
+G_DECLARE_FINAL_TYPE (GtkDragIcon, gtk_drag_icon, GTK, DRAG_ICON, GtkContainer)
+
+GDK_AVAILABLE_IN_ALL
+GtkWidget *     gtk_drag_icon_new_for_drag (GdkDrag *drag);
+GDK_AVAILABLE_IN_ALL
+void            gtk_drag_icon_set_from_paintable (GdkDrag      *drag,
+                                                  GdkPaintable *paintable,
+                                                  int           hot_x,
+                                                  int           hot_y);
+
+G_END_DECLS
+
+
+#endif /* __GTK_DRAG_ICON_H__ */

gtk/gtkdragiconprivate.h

@@ -26,14 +26,10 @@
 #define __GTK_DRAG_ICON_PRIVATE_H__
 
 #include <gio/gio.h>
-#include <gtk/gtk.h>
+#include <gtk/gtkdragicon.h>
 
 G_BEGIN_DECLS
 
-#define GTK_TYPE_DRAG_ICON (gtk_drag_icon_get_type ())
-
-G_DECLARE_FINAL_TYPE (GtkDragIcon, gtk_drag_icon, GTK, DRAG_ICON, GtkContainer)
-
 GtkWidget *     gtk_drag_icon_new                          (void);
 
 void            gtk_drag_icon_set_surface                  (GtkDragIcon *icon,