send focus change

1 files changed, 34 insertions, 1 deletions

diff --git a/src/helpers/MiscFunctions.cpp b/src/helpers/MiscFunctions.cpp
index 484bbbfc..9974ab46 100644
--- a/src/helpers/MiscFunctions.cpp
+++ b/src/helpers/MiscFunctions.cpp
@@ -8,4 +8,37 @@ void addWLSignal(wl_signal* pSignal, wl_listener* pListener, void* pOwner, std::
     wl_signal_add(pSignal, pListener);
 
     Debug::log(LOG, "Registered signal for owner %x: %x -> %x (owner: %s)", pOwner, pSignal, pListener, ownerString.c_str());
-}
\ No newline at end of file
+}
+
+void handleNoop(struct wl_listener *listener, void *data) {
+    // Do nothing
+}
+
+void wlr_signal_emit_safe(struct wl_signal *signal, void *data) {
+    struct wl_listener cursor;
+    struct wl_listener end;
+
+    /* Add two special markers: one cursor and one end marker. This way, we know
+	 * that we've already called listeners on the left of the cursor and that we
+	 * don't want to call listeners on the right of the end marker. The 'it'
+	 * function can remove any element it wants from the list without troubles.
+	 * wl_list_for_each_safe tries to be safe but it fails: it works fine
+	 * if the current item is removed, but not if the next one is. */
+    wl_list_insert(&signal->listener_list, &cursor.link);
+    cursor.notify = handleNoop;
+    wl_list_insert(signal->listener_list.prev, &end.link);
+    end.notify = handleNoop;
+
+    while (cursor.link.next != &end.link) {
+        struct wl_list *pos = cursor.link.next;
+        struct wl_listener *l = wl_container_of(pos, l, link);
+
+        wl_list_remove(&cursor.link);
+        wl_list_insert(pos, &cursor.link);
+
+        l->notify(l, data);
+    }
+
+    wl_list_remove(&cursor.link);
+    wl_list_remove(&end.link);
+}