public void BackgroundImageLinearGradientWithSide()
{
var source = "background-image: linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet)";
var property = ParseDeclaration(source);
Assert.IsTrue(property.HasValue);
Assert.IsFalse(property.IsInitial);
var value = property.RawValue as CssListValue;
Assert.IsNotNull(value);
Assert.AreEqual(1, value.Items.Length);
var gradient = value.Items[0] as CssLinearGradientValue;
Assert.IsFalse(gradient.IsRepeating);
Assert.AreEqual(Angle.Quarter, gradient.Angle);
var stops = gradient.Stops.ToArray();
Assert.AreEqual(7, stops.Length);
Assert.AreEqual(CssColors.GetColor("red").Value, stops[0].Color);
Assert.AreEqual(CssColors.GetColor("orange").Value, stops[1].Color);
Assert.AreEqual(CssColors.GetColor("yellow").Value, stops[2].Color);
Assert.AreEqual(CssColors.GetColor("green").Value, stops[3].Color);
Assert.AreEqual(CssColors.GetColor("blue").Value, stops[4].Color);
Assert.AreEqual(CssColors.GetColor("indigo").Value, stops[5].Color);
Assert.AreEqual(CssColors.GetColor("violet").Value, stops[6].Color);
}
public void BackgroundImageLinearGradientNoAngle()
{
var source = "background-image: linear-gradient(yellow, blue 20%, #0f0)";
var property = ParseDeclaration(source);
Assert.IsTrue(property.HasValue);
Assert.IsFalse(property.IsInitial);
var value = property.RawValue as CssListValue;
Assert.IsNotNull(value);
Assert.AreEqual(1, value.Items.Length);
var gradient = value.Items[0] as CssLinearGradientValue;
Assert.IsFalse(gradient.IsRepeating);
Assert.AreEqual(Angle.Half, gradient.Angle);
Assert.AreEqual(3, gradient.Stops.Count());
Assert.AreEqual(CssColors.GetColor("yellow").Value, gradient.Stops.First().Color);
Assert.AreEqual(CssColors.GetColor("blue").Value, gradient.Stops.Skip(1).First().Color);
Assert.AreEqual(Color.FromRgb(0, 255, 0), gradient.Stops.Skip(2).First().Color);
}
public static (string hexColor, float opacity) GetHexColorAndFloatOpacity(string colorText, List <string> warnings)
{
colorText = colorText.Trim();
if (colorText.StartsWith("url("))
{
throw new ArgumentException("Need to handle URL colors before getting to this point!");
}
if (colorText.StartsWith("rgb"))
{
colorText = colorText.Trim(')');
var tokens = colorText.Split(new char[] { '(', ' ', ',' }).ToArray();
tokens = tokens.Where(t => !string.IsNullOrWhiteSpace(t)).ToArray();
if (tokens.Length < 4)
{
warnings.AddWarning("Assuming color is black because could not parse color text [" + colorText + "]");
return("#000", float.NaN);
}
string hexColor = "#";
if (tokens.Length > 3)
{
var rToken = tokens[1].Trim();
if (ParseColorNumberToken(rToken) is string rHex)
{
hexColor += rHex;
}
else
{
warnings.AddWarning("Assuming color is black because could not parse red token [" + rToken + "] in color text [" + colorText + "]");
return("#000", float.NaN);
}
var gToken = tokens[2].Trim();
if (ParseColorNumberToken(gToken) is string gHex)
{
hexColor += gHex;
}
else
{
warnings.AddWarning("Assuming color is black because could not parse green token [" + gToken + "] in color text [" + colorText + "]");
return("#000", float.NaN);
}
var bToken = tokens[3].Trim();
if (ParseColorNumberToken(bToken) is string bHex)
{
hexColor += bHex;
}
else
{
warnings.AddWarning("Assuming color is black because could not parse blue token [" + bToken + "] in color text [" + colorText + "]");
return("#000", float.NaN);
}
if (tokens.Length > 4)
{
var aToken = tokens[4].Trim();
if (aToken.EndsWith("%"))
{
if (float.TryParse(aToken, out float alpha))
{
return(hexColor, alpha);
}
}
else if (float.TryParse(aToken, out float alpha))
{
return(hexColor, alpha / 255f);
}
warnings.AddWarning("Ignoring opacity because could not parse alpha token [" + aToken + "] in color text [" + colorText + "]");
}
return(hexColor, float.NaN);
}
}
if (colorText.StartsWith("#"))
{
if (colorText.Length == 4 || colorText.Length == 7)
{
return(colorText, float.NaN);
}
if (colorText.Length == 5)
{
var aHex = colorText.Substring(1, 1);
var aInt = Convert.ToInt16(aHex);
var aFloat = aInt / 15;
return("#" + colorText.Substring(2), aFloat);
}
if (colorText.Length == 9)
{
var aHex = colorText.Substring(1, 2);
var aInt = Convert.ToInt16(aHex);
var aFloat = aInt / 255f;
return("#" + colorText.Substring(3), aFloat);
}
}
else if (colorText == "transparent")
{
return("#000", 0);
}
else if (CssColors.ContainsKey(colorText.ToLower()))// (CssColors.TryGetValue(colorText, out string cssHexColor))
{
return(CssColors[colorText.ToLower()], float.NaN);
}
else if (colorText == "inherit")
{
return("inherit", float.NaN);
}
warnings.AddWarning("Could not parse color text [" + colorText + "] so assuming black.");
return("#000", float.NaN);
}