// Callback invoked when VectorHeight changes
private static void onVectorHeightChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
SharpDisplay self = (SharpDisplay)d;
AdvancedLength new_height = (AdvancedLength)e.NewValue;
if (self.IsLoaded)
{
updateActualVectorSize(self, self.VectorWidth, new_height);
}
}
// Recompute the Vector's ActualWidth and ActualSize base on current size conditions
private static void updateActualVectorSize(SharpDisplay self, AdvancedLength new_width, AdvancedLength new_height)
{
self.VectorStretch = Stretch.Fill;
if (new_width.Unit == AdvancedLength.UnitType.Auto || new_height.Unit == AdvancedLength.UnitType.Auto)
{
self.VectorStretch = Stretch.Uniform;
}
self.ActualVectorHeight = self.computeActualVectorSize(new_height, self.ActualHeight);
self.ActualVectorWidth = self.computeActualVectorSize(new_width, self.ActualWidth);
}
public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
{
if (destinationType != typeof(string))
{
throw new Exception("Unable to convert an AdvancedLength object to " + destinationType + "!");
}
AdvancedLength len = (AdvancedLength)value;
if (len == null)
{
return(null);
}
return(this.ToString());
}
//This function should ONLY be invoked from updateVectorSize() (in c# 7 this can be turned into a local function)
private double computeActualVectorSize(AdvancedLength len, double container_len)
{
switch (len.Unit)
{
case AdvancedLength.UnitType.Auto:
return(double.NaN); //In Auto mode, we set the Vector width (or length) to NaN and let the Vector.Strech = Uniform take care of the ActualWidth(or length)
case AdvancedLength.UnitType.Percent:
return(len.Value * container_len / 100);
case AdvancedLength.UnitType.Pixel:
return(len.Value);
case AdvancedLength.UnitType.Star:
return(container_len);
default:
throw new InvalidEnumArgumentException("Unhandled value: " + len.Unit);
}
}
