using System.ComponentModel;

namespace CoreUnit.Scanner.UserControl.ScannerCanvas
{
    public class ScannerParamConverter : ExpandableObjectConverter
    {
        public override bool CanConvertFrom(ITypeDescriptorContext context, System.Type sourceType)
        {
            if (sourceType == typeof(string)) return true;
            return base.CanConvertFrom(context, sourceType);
        }

        public override bool CanConvertTo(ITypeDescriptorContext context, System.Type destinationType)
        {
            if (destinationType == typeof(ScannerParam)) return true;
            return base.CanConvertTo(context, destinationType);
        }

        public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
        {
            return base.ConvertFrom(context, culture, value);
        }

        public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, System.Type destinationType)
        {
            if (destinationType == typeof(System.String) && ((int)value != -1)) {
                // 이 부분이 Property Grid의 Title value를 지정하는 곳 입니다.
                ScannerParam item = ScannerCanvasUserCtrl.ScannerParams[(int)value];
                value = string.Format("  {0:D3}  {1}", item.No + 1, item.Description);
            } else {
                if ((int)value == -1) value = null; //ScannerParamNo의 초기값이 -1이므로, -1값이 표시되지 않도록 구성함.
            }

            return base.ConvertTo(context, culture, value, destinationType);
        }
    }
}