aistudio-wpf-diagram/AIStudio.Wpf.DiagramDesigner/Converters/Converters.cs

using System;
using System.ComponentModel;
using System.Globalization;
using System.Windows;
using System.Windows.Data;

namespace AIStudio.Wpf.DiagramDesigner.Converters
{
    #region Half 
    public class HalfConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var doubleValue = (value as double?).GetValueOrDefault();

            return doubleValue / 2;
        }

        public object ConvertBack(object value, Type targetTypes, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }
    #endregion

    #region String IsNullOrEmpty
    public class IsNullOrEmptyConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return string.IsNullOrEmpty((string)value);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }
    #endregion

    #region True -> False
    public class BoolInverseConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return !(bool)value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }
    #endregion

    #region True -> Visible Or Collpased
    public class BoolToVisibleConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return (bool)value ? Visibility.Visible : Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }

    public class BoolToInvisibleConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return (bool)value ? Visibility.Collapsed : Visibility.Visible;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }
    #endregion

    #region object try to convert to image (if is uri)
    public class IconConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null || !(value.GetType() == typeof(string)))
                return value;

            var iconString = value as string;

            if (!string.IsNullOrEmpty(iconString) && Uri.IsWellFormedUriString(iconString, UriKind.RelativeOrAbsolute))
            {
                var image = new System.Windows.Controls.Image()
                {
                    Source = new System.Windows.Media.Imaging.BitmapImage(new Uri(iconString, UriKind.RelativeOrAbsolute)),
                };
                System.Windows.Media.RenderOptions.SetBitmapScalingMode(image, System.Windows.Media.BitmapScalingMode.HighQuality);
                return image;
            }
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }
    #endregion

    #region Double -> GridLength
    public class GridLengthConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var length = value?.ToString();
            try
            {
                return (GridLength)TypeDescriptor.GetConverter(typeof(GridLength)).ConvertFromString(length);
            }
            catch
            {
                return new GridLength(1, GridUnitType.Auto);
            }
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }
    #endregion

    #region Combiner
    public class MultiCombinerConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            return values.Clone();
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            return new object[] { DependencyProperty.UnsetValue, DependencyProperty.UnsetValue };
        }
    }
    #endregion

    #region NotAlignmentCenter
    public class NotAlignmentCenterConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is HorizontalAlignment)
            {
                var alignment = (HorizontalAlignment)value;
                return alignment != HorizontalAlignment.Center;
            }
            else if (value is VerticalAlignment)
            {
                var alignment = (VerticalAlignment)value;
                return alignment != VerticalAlignment.Center;
            }
            else
                return true;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }
    #endregion
}