This revision was broken. Disregard, I'm re-sending.

On Tue, Aug 8, 2017 at 10:45 AM, Matt Hoosier <matt.hoos...@gmail.com>
wrote:

> It's useful for the shell implementation to know when these change,
> for example to relay the information on to taskbars or similar.
>
> To avoid ABI changes or the need to make the weston_desktop_surface
> definition public, new functions are introduced for attaching
> listeners to these signals.
>
> Signed-off-by: Matt Hoosier <matt.hoos...@gmail.com>
> ---
>  libweston-desktop/libweston-desktop.h |  6 ++++++
>  libweston-desktop/surface.c           | 21 +++++++++++++++++++++
>  2 files changed, 27 insertions(+)
>
> diff --git a/libweston-desktop/libweston-desktop.h
> b/libweston-desktop/libweston-desktop.h
> index 03b04c7b..e38257e5 100644
> --- a/libweston-desktop/libweston-desktop.h
> +++ b/libweston-desktop/libweston-desktop.h
> @@ -164,6 +164,12 @@ weston_desktop_surface_set_size(struct
> weston_desktop_surface *surface,
>                                 int32_t width, int32_t height);
>  void
>  weston_desktop_surface_close(struct weston_desktop_surface *surface);
> +void
> +weston_desktop_surface_add_title_listener(struct weston_desktop_surface
> *surface,
> +                                         struct wl_listener *listener);
> +void
> +weston_desktop_surface_add_app_id_listener(struct weston_desktop_surface
> *surface,
> +                                          struct wl_listener *listener);
>
>  void *
>  weston_desktop_surface_get_user_data(struct weston_desktop_surface
> *surface);
> diff --git a/libweston-desktop/surface.c b/libweston-desktop/surface.c
> index d3be9364..97a455c6 100644
> --- a/libweston-desktop/surface.c
> +++ b/libweston-desktop/surface.c
> @@ -64,6 +64,8 @@ struct weston_desktop_surface {
>                 char *title;
>                 char *app_id;
>                 pid_t pid;
> +               struct wl_signal title_signal;
> +               struct wl_signal app_id_signal;
>         };
>         struct {
>                 struct weston_desktop_surface *parent;
> @@ -287,6 +289,9 @@ weston_desktop_surface_create(struct weston_desktop
> *desktop,
>         wl_list_init(&surface->view_list);
>         wl_list_init(&surface->grab_link);
>
> +       wl_signal_init(&surface->title_signal);
> +       wl_signal_init(&surface->app_id_signal);
> +
>         return surface;
>  }
>
> @@ -511,6 +516,20 @@ weston_desktop_surface_close(struct
> weston_desktop_surface *surface)
>
>  surface->implementation_data);
>  }
>
> +WL_EXPORT void
> +weston_desktop_surface_add_title_listener(struct weston_desktop_surface
> *surface,
> +                                         struct wl_listener *listener)
> +{
> +       wl_signal_add(&surface->title_signal, listener);
> +}
> +
> +WL_EXPORT void
> +weston_desktop_surface_add_app_id_listener(struct weston_desktop_surface
> *surface,
> +                                          struct wl_listener *listener)
> +{
> +       wl_signal_add(&surface->app_id_signal, listener);
> +}
> +
>  struct weston_desktop_surface *
>  weston_desktop_surface_from_client_link(struct wl_list *link)
>  {
> @@ -687,6 +706,7 @@ weston_desktop_surface_set_title(struct
> weston_desktop_surface *surface,
>
>         free(surface->title);
>         surface->title = tmp;
> +       wl_signal_emit(&surface->title_signal, surface->title);
>  }
>
>  void
> @@ -701,6 +721,7 @@ weston_desktop_surface_set_app_id(struct
> weston_desktop_surface *surface,
>
>         free(surface->app_id);
>         surface->app_id = tmp;
> +       wl_signal_emit(&surface->app_id_signal, surface->app_id);
>  }
>
>  void
> --
> 2.13.3
>
>
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