using System.Windows;
using System.Windows.Data;

namespace ShrlAlgo.Toolkit.Mvvm
{
    public static class BindingHelper
    {
        public static Binding GetBinding(this FrameworkElement element, DependencyProperty dependencyProperty)
        {
            var expression = element.GetBindingExpression(dependencyProperty);
            if (expression == null)
            {
                return null;
            }
            return expression.ParentBinding;
           
        }
        /// <summary>
        /// 获取绑定的源(模型视图)属性类型
        /// </summary>
        /// <param name="element"></param>
        /// <param name="dependencyProperty"></param>
        /// <returns></returns>
        public static Type GetBindingPropertyType(this FrameworkElement element, DependencyProperty dependencyProperty)
        {
            var binding = element.GetBindingExpression(dependencyProperty);
            var source = binding.ResolvedSource;
            var prop = source.GetType().GetProperty(binding.ResolvedSourcePropertyName);
            return prop.PropertyType;
        }
        /// <summary>
        /// 设置绑定
        /// </summary>
        /// <param name="element">wpf框架元素</param>
        /// <param name="dependencyProperty">依赖属性</param>
        /// <param name="propertyName">视图模型属性</param>
        /// <param name="sourceData">视图模型</param>
        public static void SetBinding(this FrameworkElement element,DependencyProperty dependencyProperty,string propertyName,object sourceData)
        {
            var description = new Binding() { Path = new PropertyPath(propertyName), Source = sourceData };
            element.SetBinding(dependencyProperty, description);
        }
    }
}