From aea706230d19d61e40e4481a1a1f1b09c426dd70 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
Date: Thu, 18 Aug 2016 12:57:17 +0800
Subject: [PATCH] MetaWaylandSurface: Add 'unmapped' signal

Meant to be used by users of MetaWaylandSurface's that need to know
when the surface was unmapped. So far only emitted by shell surfaces
(surfaces with MetaWindow's).

https://bugzilla.gnome.org/show_bug.cgi?id=769786
---
 src/wayland/meta-wayland-surface.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index 210f77172..765f06e06 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -120,6 +120,7 @@ G_DEFINE_TYPE (MetaWaylandSurfaceRoleDND,
 
 enum {
   SURFACE_DESTROY,
+  SURFACE_UNMAPPED,
   N_SURFACE_SIGNALS
 };
 
@@ -1100,9 +1101,14 @@ void
 meta_wayland_surface_set_window (MetaWaylandSurface *surface,
                                  MetaWindow         *window)
 {
+  gboolean was_unmapped = surface->window && !window;
+
   surface->window = window;
   sync_reactive (surface);
   sync_drag_dest_funcs (surface);
+
+  if (was_unmapped)
+    g_signal_emit (surface, surface_signals[SURFACE_UNMAPPED], 0);
 }
 
 static void
@@ -1855,6 +1861,14 @@ meta_wayland_surface_class_init (MetaWaylandSurfaceClass *klass)
                   0, NULL, NULL,
                   g_cclosure_marshal_VOID__VOID,
                   G_TYPE_NONE, 0);
+
+  surface_signals[SURFACE_UNMAPPED] =
+    g_signal_new ("unmapped",
+                  G_TYPE_FROM_CLASS (object_class),
+                  G_SIGNAL_RUN_LAST,
+                  0, NULL, NULL,
+                  g_cclosure_marshal_VOID__VOID,
+                  G_TYPE_NONE, 0);
 }
 
 static void