[gtk/dnd-gestures-2: 99/100] label: Use gdk_drag_begin

[Matthias Clasen <matthiasc src gnome org>]

commit 7a0a0240aa9b0c5a8ee0ccd09d1de257d8f68752
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jan 6 16:00:32 2020 -0500

    label: Use gdk_drag_begin
    
    This is an attempt at doing drags without GtkDragSource

 gtk/gtklabel.c | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)
---
diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index 7a30e65d52..db0c841e2a 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -54,6 +54,8 @@
 #include "gtkpopovermenu.h"
 #include "gtknative.h"
 #include "gtkdragsource.h"
+#include "gtkdragicon.h"
+#include "gtkpicture.h"
 
 #include "a11y/gtklabelaccessibleprivate.h"
 
@@ -4716,19 +4718,35 @@ gtk_label_drag_gesture_update (GtkGestureDrag *gesture,
     {
       if (gtk_drag_check_threshold (widget, info->drag_start_x, info->drag_start_y, x, y))
        {
-          GtkDragSource *source;
+          GdkDrag *drag;
           GdkPaintable *paintable;
+          GdkSurface *surface;
           GdkDevice *device;
+          GtkWidget *drag_icon;
+          GtkWidget *picture;
 
-          source = gtk_drag_source_new ();
-          gtk_drag_source_set_content (source, info->provider);
+          surface = gtk_native_get_surface (gtk_widget_get_native (widget));
+          device = gtk_gesture_get_device (GTK_GESTURE (gesture));
+
+          drag = gdk_drag_begin (surface,
+                                 device,
+                                 info->provider,
+                                 GDK_ACTION_COPY,
+                                 info->drag_start_x,
+                                 info->drag_start_y);
+
+          drag_icon = gtk_drag_icon_new_for_drag (drag);
+          gtk_widget_show (drag_icon);
           paintable = get_selection_paintable (label);
-          gtk_drag_source_set_icon (source, paintable, 9, 0);
+          picture = gtk_picture_new_for_paintable (paintable);
+          gtk_picture_set_can_shrink (GTK_PICTURE (picture), FALSE);
           g_clear_object (&paintable); 
-          device = gtk_gesture_get_device (GTK_GESTURE (gesture));
-          gtk_drag_source_drag_begin (source, widget, device, info->drag_start_x, info->drag_start_y);
-          g_object_unref (source);
+          gtk_container_add (GTK_CONTAINER (drag_icon), picture);
+          g_object_ref_sink (drag_icon);
+          g_object_set_data_full (G_OBJECT (drag), "icon", drag_icon, (GDestroyNotify)gtk_widget_destroy);
 
+          g_object_unref (drag);
+          
          info->in_drag = FALSE;
        }
     }