IVH树视图不确定状态不起作用

Question

我已经实现了ivhtreeview。选择和取消选择都可以正常工作。但是，当我取消选中子节点时，父节点不会被更新为不确定状态，但是父复选框也未被选中。

下面是我的代码，

app.config(['ivhTreeviewOptionsProvider',
    function (ivhTreeviewOptionsProvider) {
        ivhTreeviewOptionsProvider.set({
            defaultSelectedState: true,
            validate: true,
        });
}])

app.directive('asciiBox', ['ivhTreeviewMgr', 'ivhTreeviewBfs', function (ivhTreeviewMgr, ivhTreeviewBfs) {
    return {
        restrict: 'AE',
        require: '^ivhTreeview',
        template: [
            '<span class="ivh-treeview-checkbox-wrapper">',
            '<input type="checkbox" checked="checked" class="ivh-treeview-checkbox" ng-model="node.selected"  ng-change="trvw.select(node, node.selected)"/><label class="checkboxHelper">&nbsp;</label></span >',
            '',
        ].join('\n'),
        link: function (scope, element, attrs, trvw) {
            element.on('click', function () {
                ivhTreeviewMgr.select(scope.trvw.root(), scope.node, scope.node.selected);
                scope.$apply();
            });
        }
    };
}]);

View:


 <div class="treeview" ivh-treeview="nodes"
                 ivh-treeview-expand-to-depth="0"
                 ivh-treeview-id-attribute="'Code'" 
                 ivh-treeview-label-attribute="'Name'"
                 ivh-treeview-children-attribute="'children'"
                 ivh-treeview-node-tpl="tpl" 
                 ivh-treeview-default-selected-state="true" ivh-treeview-selected-attribute="'selected'">
            </div>

创建了一个JSBIN，但是其复选框不确定，可以正常工作:( http://jsbin.com/vihomes/edit?html,js,output

1. 如果您看下面的图片，该复选框后面的蓝色背景是我为该复选框定制的样式，这没有反映在上述JSBIN链接中。

2. 如果您观察父节点和子节点的状态，则不确定是否起作用