add icheck custom widget

Author: Andrew Telnov (DevExpress)

src/icheck.js

@@ -0,0 +1,46 @@
+import "./utils/surveyjs_importer.js";
+
+var widget = {
+    className: "iradio_square-blue",
+    name: "icheck",
+    isFit : function(question) {  var t = question.getType(); return t === 'radiogroup' || t === 'checkbox' || t === 'matrix'; },
+    isDefaultRender: true,
+    afterRender: function(question, el) {
+        var $el = $(el);
+        $(el).find('input').data({"iCheck": undefined});
+        $el.find('input').iCheck({
+          checkboxClass: widget.className,
+          radioClass: widget.className
+        });
+        var select = function() {
+            if(question.getType() != "matrix") {
+                $el.find("input[value=" + question.value + "]").iCheck('check');
+            } else {
+                question.generatedVisibleRows.forEach(function(row, index, rows) {
+                    if (row.value) {
+                      $(el).find("input[name='" + row.fullName  + "'][value=" + row.value + "]").iCheck('check');
+                    }
+                  });                
+            }
+        }
+        $el.find('input').on('ifChecked', function(event) {
+            if(question.getType() != "matrix") {
+                question.value = event.target.value;
+            } else {
+                question.generatedVisibleRows.forEach(function(row, index, rows) {
+                    if (row.fullName === event.target.name) {
+                      row.value = event.target.value
+                    }
+                });
+            }
+        });
+        question.valueChangedCallback = select;
+        select();
+    },
+    willUnmount: function(question, el) {
+        var $el = $(el);
+        $el.find('input').iCheck('destroy');
+    } 
+}
+
+Survey.CustomWidgetCollection.Instance.addCustomWidget(widget, "type");