Refs #2538: Added Elggy event system. Javascript boot sequence mimics PHP.

git-svn-id: http://code.elgg.org/elgg/trunk@7186 36083f99-b078-4883-b0ff-0f9b5a30f544

1 files changed, 65 insertions, 0 deletions

diff --git a/engine/js/lib/events.js b/engine/js/lib/events.js
new file mode 100644
index 000000000..358dd6280
--- /dev/null
+++ b/engine/js/lib/events.js
@@ -0,0 +1,65 @@
+elgg.provide('elgg.config.events');
+elgg.provide('elgg.config.events.all');
+elgg.provide('elgg.config.events.all.all');
+
+elgg.register_event_handler = function(event, type, callback, priority) {
+	elgg.assertTypeOf('string', event);
+	elgg.assertTypeOf('string', event);
+	elgg.assertTypeOf('function', callback);
+	
+	if (!event || !type) {
+		return false;
+	}
+	
+	elgg.provide('elgg.config.events.' + event + '.' + type);
+
+	var events = elgg.config.events;
+	
+	if (!(events[event][type] instanceof elgg.ElggPriorityList)) {
+		events[event][type] = new elgg.ElggPriorityList();
+	}
+
+	return events[event][type].insert(callback, priority);
+};
+
+elgg.trigger_event = function(event, type, object) {
+	elgg.assertTypeOf('string', event);
+	elgg.assertTypeOf('string', event);
+
+	elgg.provide('elgg.config.events.' + event + '.' + type);
+	elgg.provide('elgg.config.events.all.' + type);
+	elgg.provide('elgg.config.events.' + event + '.all');
+	elgg.provide('elgg.config.events.all.all');
+	
+	var events = elgg.config.events;
+	
+	var callEventHandler = function(handler) { 
+		return handler(event, type, object) !== false; 
+	};
+	
+	if (events[event][type] instanceof elgg.ElggPriorityList) {
+		if (!events[event][type].every(callEventHandler)) {
+			return false;
+		}
+	}
+	
+	if (events['all'][type] instanceof elgg.ElggPriorityList) {
+		if (!events['all'][type].every(callEventHandler)) {
+			return false;
+		}
+	}
+	
+	if (events[event]['all'] instanceof elgg.ElggPriorityList) {
+		if (!events[event]['all'].every(callEventHandler)) {
+			return false;
+		}
+	}
+	
+	if (events['all']['all'] instanceof elgg.ElggPriorityList) {
+		if (!events['all']['all'].every(callEventHandler)) {
+			return false;
+		}
+	}
+		
+	return true;
+};
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