better deferred call

lib/ace/lib/lang.js

@@ -134,7 +134,7 @@ exports.getMatchOffsets = function(string, regExp) {
     return matches;
 };
 
-
+/* deprecated */
 exports.deferredCall = function(fcn) {
 
     var timer = null;
@@ -166,4 +166,39 @@ exports.deferredCall = function(fcn) {
     return deferred;
 };
 
+
+exports.delayedCall = function(fcn, defaultTimeout) {
+    var timer = null;
+    var callback = function() {
+        timer = null;
+        fcn();
+    };
+
+    var _self = function(timeout) {
+        timer && clearTimeout(timer);
+        timer = setTimeout(callback, timeout || defaultTimeout);
+    };
+
+    _self.delay = delayed;
+    _self.schedule = function(timeout) {
+        if (timer == null)
+            timer = setTimeout(callback, timeout || 0);
+    };
+
+    _self.call = function() {
+        this.cancel();
+        fcn();
+    };
+
+    _self.cancel = function() {
+        timer && clearTimeout(timer);
+        timer = null;
+    };
+
+    _self.isPending = function() {
+        return timer;
+    };
+
+    return _self;
+};
 });