/// <summary>Converts all percentage and enum values to point equivalent.</summary>
/// <param name="fullWidth">container width to calculate percentage.</param>
/// <param name="fullHeight">container height to calculate percentage.</param>
/// <param name="outXValue">
///
/// <see cref="UnitValue"/>
/// to store processed xPosition.
/// </param>
/// <param name="outYValue">
///
/// <see cref="UnitValue"/>
/// to store processed yPosition.
/// </param>
public virtual void CalculatePositionValues(float fullWidth, float fullHeight, UnitValue outXValue, UnitValue
outYValue)
{
int posMultiplier = ParsePositionXToUnitValueAndReturnMultiplier(outXValue);
if (posMultiplier == 0 && xShift != null && Math.Abs(xShift.GetValue()) > EPS)
{
outXValue.SetValue(0);
}
else
{
outXValue.SetValue(CalculateValue(outXValue, fullWidth) + CalculateValue(xShift, fullWidth) * posMultiplier
);
}
outXValue.SetUnitType(UnitValue.POINT);
posMultiplier = ParsePositionYToUnitValueAndReturnMultiplier(outYValue);
if (posMultiplier == 0 && yShift != null && Math.Abs(yShift.GetValue()) > EPS)
{
outYValue.SetValue(0);
}
else
{
outYValue.SetValue(CalculateValue(outYValue, fullHeight) + CalculateValue(yShift, fullHeight) * posMultiplier
);
}
outYValue.SetUnitType(UnitValue.POINT);
}
/// <summary>
/// Parses positionY to
/// <see cref="UnitValue"/>.
/// </summary>
/// <param name="outValue">
///
/// <see cref="UnitValue"/>
/// in which positionY will be parsed
/// </param>
/// <returns>multiplier by which the yShift will be multiplied</returns>
private int ParsePositionYToUnitValueAndReturnMultiplier(UnitValue outValue)
{
outValue.SetUnitType(UnitValue.PERCENT);
switch (positionY)
{
case BackgroundPosition.PositionY.TOP: {
outValue.SetValue(0);
return(1);
}
case BackgroundPosition.PositionY.BOTTOM: {
outValue.SetValue(FULL_VALUE);
return(-1);
}
case BackgroundPosition.PositionY.CENTER: {
outValue.SetValue(HALF_VALUE);
return(0);
}
default: {
return(0);
}
}
}