public static MediaDefinition Lookup(EMediaFeatureName Name)
{
if (CssDefinitions.MediaDefinitions.TryGetValue(Name, out MediaDefinition def))
{
return(def);
}
return(null);
}
// private bool IsNegated = false;
#endregion
#region Constructors
/// <summary>
/// Creates a new 'boolean' type media feature
/// </summary>
/// <param name="name"></param>
public MediaFeature(EMediaFeatureName Name)
{
Context = EMediaFeatureContext.Boolean;
MediaDefinition def = MediaDefinition.Lookup(Name);
if (def != null)
{
IsValid = true;
/* if an allowed type is keywords and 'none' is an option then we match it against that keyword */
if (0 != (def.AllowedTypes & ECssValueTypes.KEYWORD) && def.KeywordWhitelist.Contains("none"))
{
Values = new CssValue[] { CssValue.From(Name), CssValue.None };
}
else if (0 != (def.AllowedTypes & ECssValueTypes.INTEGER))
{
Values = new CssValue[] { CssValue.From(Name), CssValue.From(0) };
}
else if (0 != (def.AllowedTypes & ECssValueTypes.DIMENSION))
{
Values = new CssValue[] { CssValue.From(Name), CssValue.From(0, ECssUnit.PX) };
}
else if (0 != (def.AllowedTypes & ECssValueTypes.RESOLUTION))
{
Values = new CssValue[] { CssValue.From(Name), CssValue.From(0, ECssUnit.DPPX) };
}
}
else
{
/* This isnt a supported feature, therefore it should always evaluate to false */
IsValid = false;
}
/* For sanity just catch the case where we dont have values to compare here */
if (Values.Length <= 0)
{
IsValid = false;
}
}
static object Resolve_Media_Name_Value(Document document, EMediaFeatureName Name)
{
Screen screen = document.defaultView.screen;
switch (Name)
{
case EMediaFeatureName.AspectRatio:
case EMediaFeatureName.Min_AspectRatio:
case EMediaFeatureName.Max_AspectRatio:
{
return(screen.width / (double)screen.height);
}
case EMediaFeatureName.Width:
case EMediaFeatureName.Min_Width:
case EMediaFeatureName.Max_Width:
{
return(screen.width);
}
case EMediaFeatureName.Height:
case EMediaFeatureName.Min_Height:
case EMediaFeatureName.Max_Height:
{
return(screen.height);
}
case EMediaFeatureName.Color:
case EMediaFeatureName.Min_Color:
case EMediaFeatureName.Max_Color:
{
return(screen.colorDepth);
}
case EMediaFeatureName.Monochrome:
case EMediaFeatureName.Min_Monochrome:
case EMediaFeatureName.Max_Monochrome:
{
return(screen.monochromeDepth);
}
case EMediaFeatureName.ColorIndex:
case EMediaFeatureName.Min_ColorIndex:
case EMediaFeatureName.Max_ColorIndex:
{
return(screen.colorIndex);
}
case EMediaFeatureName.Grid:
{
return(screen.isGrid);
}
case EMediaFeatureName.Update:
{
return(screen.refreshRate);
}
default:
{
throw new NotImplementedException($"Media feature \"{Enum.GetName(typeof(EMediaFeatureName), Name)}\" is not implemented");
}
}
}
bool Compare_Keyword(Document document, EMediaFeatureName Name, string keyword)
{
switch (Name)
{
case EMediaFeatureName.Orientation:
{
if (Lookup.TryEnum(keyword, out EMediaOrientation outOrientation))
{
double width = (double)Resolve_Media_Name_Value(document, EMediaFeatureName.Width);
double height = (double)Resolve_Media_Name_Value(document, EMediaFeatureName.Height);
return((outOrientation == EMediaOrientation.Landscape) ? width >= height: height >= width);
}
}
break;
case EMediaFeatureName.Update:
{
if (Lookup.TryEnum(keyword, out EMediaUpdate outUpdateRate))
{
double refreshRate = (double)Resolve_Media_Name_Value(document, Name);
switch (outUpdateRate)
{
case EMediaUpdate.None:
{
return(0 == refreshRate);
}
case EMediaUpdate.Slow:
{
return(refreshRate < 20);
}
case EMediaUpdate.Fast:
{
return(refreshRate > 20);
}
}
}
}
break;
case EMediaFeatureName.Color:
case EMediaFeatureName.Min_Color:
case EMediaFeatureName.Max_Color:
{
return((ulong)Resolve_Media_Name_Value(document, Name) > 0);
}
case EMediaFeatureName.Monochrome:
case EMediaFeatureName.Min_Monochrome:
case EMediaFeatureName.Max_Monochrome:
{
return((ulong)Resolve_Media_Name_Value(document, Name) > 0);
}
case EMediaFeatureName.ColorIndex:
case EMediaFeatureName.Min_ColorIndex:
case EMediaFeatureName.Max_ColorIndex:
{
return((ulong)Resolve_Media_Name_Value(document, Name) > 0);
}
case EMediaFeatureName.Grid:
{
return((ulong)Resolve_Media_Name_Value(document, Name) > 0);
}
case EMediaFeatureName.Width:
case EMediaFeatureName.Min_Width:
case EMediaFeatureName.Max_Width:
{
return((long)Resolve_Media_Name_Value(document, Name) > 0);
}
case EMediaFeatureName.Height:
case EMediaFeatureName.Min_Height:
case EMediaFeatureName.Max_Height:
{
return((long)Resolve_Media_Name_Value(document, Name) > 0);
}
case EMediaFeatureName.AspectRatio:
case EMediaFeatureName.Min_AspectRatio:
case EMediaFeatureName.Max_AspectRatio:
{
return((double)Resolve_Media_Name_Value(document, Name) > 0);
}
}
return(false);
}
