[gtk+/wip/matthiasc/monitor] Add a GdkMonitor::invalidate signal

[Matthias Clasen <matthiasc src gnome org>]

commit 194d73f43226d5b7251360455e42e2e6e54bda30
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Apr 11 20:57:43 2016 -0400

    Add a GdkMonitor::invalidate signal
    
    This can be used to track when a monitor object is dropped by the
    backend, without having to listen to display signals.

 gdk/gdkmonitor.c        |   22 ++++++++++++++++++++++
 gdk/gdkmonitorprivate.h |    1 +
 2 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkmonitor.c b/gdk/gdkmonitor.c
index deddb52..e5c5d5b 100644
--- a/gdk/gdkmonitor.c
+++ b/gdk/gdkmonitor.c
@@ -47,6 +47,7 @@
  * - provide a persistent id (if the backend allows)
  * - convert win32
  * - convert quartz
+ * - convert mir
  */
 enum {
   PROP_0,
@@ -65,6 +66,13 @@ enum {
 
 static GParamSpec *props[LAST_PROP] = { NULL, };
 
+enum {
+  INVALIDATE,
+  LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL] = { 0 };
+
 G_DEFINE_TYPE (GdkMonitor, gdk_monitor, G_TYPE_OBJECT)
 
 static void
@@ -238,6 +246,14 @@ gdk_monitor_class_init (GdkMonitorClass *class)
                        G_PARAM_READABLE);
 
   g_object_class_install_properties (object_class, LAST_PROP, props);
+
+  signals[INVALIDATE] = g_signal_new ("invalidate",
+                                      G_TYPE_FROM_CLASS (object_class),
+                                      G_SIGNAL_RUN_FIRST,
+                                      0,
+                                      NULL, NULL,
+                                      g_cclosure_marshal_VOID__VOID,
+                                      G_TYPE_NONE, 0);
 }
 
 /**
@@ -587,3 +603,9 @@ gdk_monitor_set_subpixel_layout (GdkMonitor        *monitor,
 
   g_object_notify (G_OBJECT (monitor), "subpixel-layout");
 }
+
+void
+gdk_monitor_invalidate (GdkMonitor *monitor)
+{
+  g_signal_emit (monitor, signals[INVALIDATE], 0);
+}
diff --git a/gdk/gdkmonitorprivate.h b/gdk/gdkmonitorprivate.h
index 0d63113..c76b59c 100644
--- a/gdk/gdkmonitorprivate.h
+++ b/gdk/gdkmonitorprivate.h
@@ -72,6 +72,7 @@ void            gdk_monitor_set_refresh_rate    (GdkMonitor *monitor,
                                                  int         refresh_rate);
 void            gdk_monitor_set_subpixel_layout (GdkMonitor        *monitor,
                                                  GdkSubpixelLayout  subpixel);
+void            gdk_monitor_invalidate          (GdkMonitor *monitor);
 
 G_END_DECLS