dix: Add a callback chain for window property state change

This will be used by in-server features that need to react to property
changes. The first one will be _XWAYLAND_ALLOW_COMMITS.

Signed-off-by: Adam Jackson <ajax@redhat.com>
[Pekka: add commit message body]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

1 files changed, 9 insertions, 0 deletions

diff --git a/dix/property.c b/dix/property.c
index 3447bca89..ff1d6693b 100644
--- a/dix/property.c
+++ b/dix/property.c
@@ -105,10 +105,17 @@ dixLookupProperty(PropertyPtr *result, WindowPtr pWin, Atom propertyName,
     return rc;
 }
 
+CallbackListPtr PropertyStateCallback;
+
 static void
 deliverPropertyNotifyEvent(WindowPtr pWin, int state, PropertyPtr pProp)
 {
     xEvent event;
+    PropertyStateRec rec = {
+        .win = pWin,
+        .prop = pProp,
+        .state = state
+    };
     UpdateCurrentTimeIf();
     event = (xEvent) {
         .u.property.window = pWin->drawable.id,
@@ -117,6 +124,8 @@ deliverPropertyNotifyEvent(WindowPtr pWin, int state, PropertyPtr pProp)
         .u.property.time = currentTime.milliseconds,
     };
     event.u.u.type = PropertyNotify;
+
+    CallCallbacks(&PropertyStateCallback, &rec);
     DeliverEvents(pWin, &event, 1, (WindowPtr) NULL);
 }