public void CanConvertFrom()
{
SizeConverter r = new SizeConverter();
Assert.IsTrue(r.CanConvertFrom(typeof(string)));
Assert.IsFalse(r.CanConvertFrom(typeof(Size)));
}
public void CanConvertFrom()
{
_converter.CanConvertFrom(null, typeof(string)).Should().BeTrue();
_converter.CanConvertFrom(null, typeof(int)).Should().BeFalse();
_converter.CanConvertFrom(null, typeof(void)).Should().BeFalse();
_converter.CanConvertFrom(null, typeof(object)).Should().BeFalse();
_converter.CanConvertFrom(null, typeof(Size)).Should().BeFalse();
_converter.CanConvertFrom(null, typeof(SizeConverter)).Should().BeFalse();
}
/// <inheritdoc />
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
var desiredSize = Size.Empty;
// TargetVisual can be at index 1 or index 2, depending on the number of values passed
var targetVisual = values.Length == 2
? values[1] as Visual
: null;
if (targetVisual == null)
{
targetVisual = values.Length == 3
? values[2] as Visual
: null;
}
if (values.Length >= 2 &&
values[1] is Size desiredSizeFromIndex1)
{
desiredSize = desiredSizeFromIndex1;
}
else if (values.Length >= 2 &&
(values[1] is Visual) == false)
{
var possibleDesiredSizeValue = values[1];
object convertedValue;
if (sizeConverter.CanConvertFrom(possibleDesiredSizeValue.GetType()) &&
(convertedValue = sizeConverter.ConvertFrom(possibleDesiredSizeValue)) != null)
{
desiredSize = (Size)convertedValue;
}
else
{
desiredSize = Size.Empty;
}
}
//if (desiredSize.IsEmpty
// && targetVisual != null
// && targetVisual is FrameworkElement targetFrameworkElement
// && DoubleHelper.IsFinite(targetFrameworkElement.Width)
// && DoubleHelper.IsFinite(targetFrameworkElement.Height))
//{
// desiredSize = new Size(targetFrameworkElement.Width, targetFrameworkElement.Height);
//}
return(this.Convert(values[0], targetVisual, desiredSize, targetType));
}
/// <inheritdoc />
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
var desiredSize = Size.Empty;
var valuesLength = values.Length;
// TargetVisual can be at index 1 or index 2, depending on the number of values passed
var targetVisual = valuesLength == 2
? values[1] as Visual
: null;
if (targetVisual is null)
{
targetVisual = valuesLength == 3
? values[2] as Visual
: null;
}
if (valuesLength >= 2 &&
values[1] is Size desiredSizeFromIndex1)
{
desiredSize = desiredSizeFromIndex1;
}
else if (valuesLength >= 2 &&
(values[1] is Visual) == false)
{
var possibleDesiredSizeValue = values[1];
object?convertedValue;
if (possibleDesiredSizeValue is not null &&
sizeConverter.CanConvertFrom(possibleDesiredSizeValue.GetType()) &&
(convertedValue = sizeConverter.ConvertFrom(possibleDesiredSizeValue)) is not null)
{
desiredSize = (Size)convertedValue;
}
else
{
desiredSize = Size.Empty;
}
}
