Fix and improve cursor

www/common/sframe-common-cursor.js

@@ -0,0 +1,53 @@
+define([
+], function () {
+    var module = {};
+
+    module.create = function (Common) {
+        var exp = {};
+        var sframeChan = Common.getSframeChannel();
+        var metadataMgr = Common.getMetadataMgr();
+
+        var execCommand = function (cmd, data, cb) {
+            sframeChan.query('Q_CURSOR_COMMAND', {cmd: cmd, data: data}, function (err, obj) {
+                if (err || (obj && obj.error)) { return void cb(err || (obj && obj.error)); }
+                cb(void 0, obj);
+            });
+        };
+
+        exp.updateCursor = function (obj) {
+            execCommand('UPDATE', obj, function (err) {
+                if (err) { console.error(err); }
+            });
+        };
+
+        var messageHandlers = [];
+        exp.onCursorUpdate = function (handler) {
+            messageHandlers.push(handler);
+        };
+        var onMessage = function (data) {
+            messageHandlers.forEach(function (h) {
+                try {
+                    h(data);
+                } catch (e) {
+                    console.error(e);
+                }
+            });
+        };
+
+
+        sframeChan.on('EV_CURSOR_EVENT', function (obj) {
+            var cmd = obj.ev;
+            var data = obj.data;
+            if (cmd === 'MESSAGE') {
+                onMessage(data);
+                return;
+            }
+        });
+
+        return exp;
+    };
+
+    return module;
+});
+
+