[gtk+/wip/carlosg/event-delivery: 14/72] gtk: Implement cursor updates

[Timm Bäder <baedert src gnome org>]

commit b0f4fc99cd406e7138a89997a21ae82a442f0e61
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Mar 31 17:54:06 2017 +0200

    gtk: Implement cursor updates
    
    As we don't obey GdkWindow cursors anymore, someone must set those.
    Use the private Gtkwidget API at the moment.

 gtk/gtkmain.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index 3912749..2f45867 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -1307,6 +1307,23 @@ check_event_in_child_popover (GtkWidget *event_widget,
   return (popover_parent == grab_widget || gtk_widget_is_ancestor (popover_parent, grab_widget));
 }
 
+static void
+update_cursor (GtkWindow *toplevel,
+               GdkDevice *device,
+               GtkWidget *target)
+{
+  GdkCursor *cursor = NULL;
+
+  while (!cursor && target)
+    {
+      cursor = gtk_widget_get_cursor (target);
+      target = _gtk_widget_get_parent (target);
+    }
+
+  gdk_window_set_device_cursor (gtk_widget_get_window (GTK_WIDGET (toplevel)),
+                                device, cursor);
+}
+
 static GdkNotifyType
 get_virtual_notify_type (GdkNotifyType notify_type)
 {
@@ -1484,6 +1501,8 @@ handle_pointing_event (GdkEvent *event)
     case GDK_ENTER_NOTIFY:
       target = _gtk_toplevel_pick (toplevel, x, y, NULL, NULL);
       old_target = update_pointer_focus_state (toplevel, event, target);
+      if (event->type == GDK_MOTION_NOTIFY || event->type == GDK_ENTER_NOTIFY)
+        update_cursor (toplevel, device, target);
 
       /* Let it take the effective pointer focus anyway, as it may change due
        * to implicit grabs.