Merge the Events module (branches/struggleyb/libdom-events) back to trunk. :)

svn path=/trunk/dom/; revision=9236

1 files changed, 62 insertions, 0 deletions

diff --git a/src/events/event_listener.c b/src/events/event_listener.c
new file mode 100644
index 0000000..3c3c14c
--- /dev/null
+++ b/src/events/event_listener.c
@@ -0,0 +1,62 @@
+/*
+ * This file is part of libdom.
+ * Licensed under the MIT License,
+ *                http://www.opensource.org/licenses/mit-license.php
+ * Copyright 2009 Bo Yang <struggleyb.nku@gmail.com>
+ */
+
+#include "events/event_listener.h"
+#include "core/document.h"
+
+/**
+ * Create an EventListener
+ *
+ * \param doc       The document object
+ * \param handler   The event function
+ * \param pw        The private data
+ * \param listener  The returned EventListener
+ * \return DOM_NO_ERR on success, DOM_NO_MEM_ERR on memory exhaustion.
+ */
+dom_exception dom_event_listener_create(struct dom_document *doc,
+		handle_event handler, void *pw, dom_event_listener **listener)
+{
+	dom_event_listener *ret = (dom_event_listener *) _dom_document_alloc(
+			doc, NULL, sizeof(dom_event_listener));
+	if (ret == NULL)
+		return DOM_NO_MEM_ERR;
+	
+	ret->handler = handler;
+	ret->pw = pw;
+	ret->refcnt = 1;
+	ret->doc = doc;
+
+	*listener = ret;
+
+	return DOM_NO_ERR;
+}
+
+/**
+ * Claim a new reference on the listener object
+ *
+ * \param listener  The EventListener object
+ */
+void dom_event_listener_ref(dom_event_listener *listener)
+{
+	listener->refcnt++;
+}
+
+/**
+ * Release a reference on the listener object
+ *
+ * \param listener  The EventListener object
+ */
+void dom_event_listener_unref(dom_event_listener *listener)
+{
+	if (listener->refcnt > 0)
+		listener->refcnt--;
+
+	if (listener->refcnt == 0)
+		_dom_document_alloc(listener->doc, listener,
+				sizeof(dom_event_listener));
+}
+