### Function

# GdkWayland WaylandToplevelExported

since: 4.0

#### Declaration

    void
    (* GdkWaylandToplevelExported) (
      GdkToplevel* toplevel,
      const char* handle,
      gpointer user_data
    )

#### Description [src]

Callback that gets called when the handle for a surface has been obtained from the Wayland compositor.

This callback is used in `gdk_wayland_toplevel_export_handle()`.

The `handle` can be passed to other processes, for the purpose of marking surfaces as transient for out-of-process surfaces.

Available since: 4.0

#### Parameters

`toplevel`

  Type: `GdkWaylandToplevel`

  The `GdkToplevel` that is exported.

  The data is owned by the caller of the function.

`handle`

  Type: `const char*`

  The handle.

  The data is owned by the caller of the function.
  The value is a NUL terminated UTF-8 string.

`user_data`

  Type: `gpointer`

  User data that was passed to `gdk_wayland_toplevel_export_handle()`

  The argument can be `NULL`.
  The data is owned by the caller of the function.