public Boolean Validate(IMediaFeature feature, IRenderDevice renderDevice)
{
var defaultValue = new Length(1.0, Length.Unit.None);
var converter = feature.IsMinimum || feature.IsMaximum ? NaturalIntegerConverter : NaturalIntegerConverter.Option(defaultValue);
var index = converter.Convert(feature.Value);
if (index != null)
{
var desired = index.AsInt32();
var available = renderDevice.MonochromeBits;
if (feature.IsMaximum)
{
return(available <= desired);
}
else if (feature.IsMinimum)
{
return(available >= desired);
}
return(desired == available);
}
return(false);
}
public static Boolean Validate(this IMediaFeature feature, IRenderDevice device)
{
var validator = default(IFeatureValidator);
AssociatedValidators.TryGetValue(feature, out validator);
return(validator?.Validate(feature, device) ?? false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice renderDevice)
{
var defaultValue = new Length(1.0, Length.Unit.None);
var converter = feature.IsMinimum || feature.IsMaximum ? PositiveIntegerConverter : PositiveIntegerConverter.Option(defaultValue);
var color = converter.Convert(feature.Value);
if (color != null)
{
var desired = color.AsInt32();
var available = Math.Pow(renderDevice.ColorBits, 2);
if (feature.IsMaximum)
{
return(available <= desired);
}
else if (feature.IsMinimum)
{
return(available >= desired);
}
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice renderDevice)
{
var hover = HoverAbilityConverter.Convert(feature.Value);
if (hover != null)
{
var desired = hover.AsEnum <HoverAbility>();
//Nothing yet, so we assume we have a headless browser
return(desired == HoverAbility.None);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var grid = BinaryConverter.Convert(feature.Value);
if (grid != null)
{
var desired = grid.AsBoolean();
var available = device.IsGrid;
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice renderDevice)
{
var accuracy = PointerAccuracyConverter.Convert(feature.Value);
if (accuracy != null)
{
var desired = accuracy.AsEnum <PointerAccuracy>();
//Nothing yet, so we assume we have a headless browser
return(desired == PointerAccuracy.None);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var portrait = OrientationModeConverter.Convert(feature.Value);
if (portrait != null)
{
var desired = portrait.Is(CssKeywords.Portrait);
var available = device.DeviceHeight >= device.DeviceWidth;
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var interlace = ScanModeConverter.Convert(feature.Value);
if (interlace != null)
{
var desired = interlace.Is(CssKeywords.Interlace);
var available = device.IsInterlaced;
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var state = ScriptingStateConverter.Convert(feature.Value);
if (state != null)
{
var available = ScriptingState.None;
var desired = state.AsEnum <ScriptingState>();
if (device.IsScripting)
{
available = device.Category == DeviceCategory.Screen ? ScriptingState.Enabled : ScriptingState.InitialOnly;
}
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var length = LengthConverter.Convert(feature.Value);
if (length != null)
{
var desired = length.AsPixel();
var available = (Double)device.DeviceWidth;
if (feature.IsMaximum)
{
return(available <= desired);
}
else if (feature.IsMinimum)
{
return(available >= desired);
}
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice renderDevice)
{
var length = LengthConverter.Convert(feature.Value);
if (length != null)
{
var desired = length.AsPx(renderDevice, RenderMode.Vertical);
var available = (Double)renderDevice.ViewPortHeight;
if (feature.IsMaximum)
{
return(available <= desired);
}
else if (feature.IsMinimum)
{
return(available >= desired);
}
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var ratio = RatioConverter.Convert(feature.Value);
if (ratio != null)
{
var desired = ratio.AsNumber();
var available = device.ViewPortWidth / (Double)device.ViewPortHeight;
if (feature.IsMaximum)
{
return(available <= desired);
}
else if (feature.IsMinimum)
{
return(available >= desired);
}
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var value = NaturalNumberConverter.Convert(feature.Value);
if (value != null)
{
var desired = value.AsNumber();
var available = device.Resolution / 96f;
if (feature.IsMaximum)
{
return(available <= desired);
}
else if (feature.IsMinimum)
{
return(available >= desired);
}
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var res = ResolutionConverter.Convert(feature.Value);
if (res != null)
{
var desired = res.AsInt32();
var available = device.Resolution;
if (feature.IsMaximum)
{
return(available <= desired);
}
else if (feature.IsMinimum)
{
return(available >= desired);
}
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var frequency = UpdateFrequencyConverter.Convert(feature.Value);
if (frequency != null)
{
var desired = frequency.AsEnum <UpdateFrequency>();
var available = device.Frequency;
if (available >= 30)
{
return(desired == UpdateFrequency.Normal);
}
else if (available > 0)
{
return(desired == UpdateFrequency.Slow);
}
return(desired == UpdateFrequency.None);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
var converter = feature.IsMinimum || feature.IsMaximum ? NaturalIntegerConverter : NaturalIntegerConverter.Option(1);
var index = converter.Convert(feature.Value);
if (index != null)
{
var desired = index.AsInteger();
var available = device.ColorBits;
if (feature.IsMaximum)
{
return(available <= desired);
}
else if (feature.IsMinimum)
{
return(available >= desired);
}
return(desired == available);
}
return(false);
}
public Boolean Validate(IMediaFeature feature, IRenderDevice device)
{
return(true);
}
public static void AssociateValidator(this IMediaFeature feature, IFeatureValidator validator) => AssociatedValidators.Add(feature, validator);