using System.Windows.Controls;

namespace ECMonitor.MVVM
{
	public class WPFAssist
	{
		/// <summary>
		/// 获取DataGrid的所有行是否存在验证错误。
		/// </summary>
		/// <param name="dg">要检查的DataGrid实例</param>
		/// <returns>true 有错，false 无错</returns>
		public static bool GetDataGridRowsHasError(DataGrid dg)
		{
			bool hasError = false;
			ValidationError err = null;
			for (int i = 0; i < dg.Items.Count; i++)
			{
				DataGridRow row = (DataGridRow)dg.ItemContainerGenerator.ContainerFromIndex(i);
				hasError = Validation.GetHasError(row);
				if (hasError)
				{
					break;
				}
			}
			return hasError;
		}

		/// <summary>
		/// 获取DataGrid的第一个被发现的验证错误结果。
		/// </summary>
		/// <param name="dg">被检查的DataGrid实例。</param>
		/// <returns>错误结果。</returns>
		public static ValidationError GetDataGridRowsFirstError(DataGrid dg)
		{
			bool hasError = false;
			ValidationError err = null;
			for (int i = 0; i < dg.Items.Count; i++)
			{
				DataGridRow row = (DataGridRow)dg.ItemContainerGenerator.ContainerFromIndex(i);
				hasError = Validation.GetHasError(row);
				if (hasError)
				{
					err = Validation.GetErrors(row)[0];
					break;
				}
			}
			return err;
		}
	}
}