Daniel Clark
119 lines
4.7 KiB
C#
119 lines
4.7 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System;
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using System.Globalization;
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using System.Reflection;
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using Windows.UI;
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using Color = Windows.UI.Color;
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namespace NotificationFlyout.Uwp.UI.Helpers
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{
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public static class ColorHelper
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{
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public static Color ToColor(this string colorString)
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{
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if (string.IsNullOrEmpty(colorString))
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{
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ThrowArgumentException();
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}
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if (colorString[0] == '#')
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{
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switch (colorString.Length)
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{
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case 9:
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{
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var cuint = Convert.ToUInt32(colorString.Substring(1), 16);
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var a = (byte)(cuint >> 24);
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var r = (byte)((cuint >> 16) & 0xff);
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var g = (byte)((cuint >> 8) & 0xff);
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var b = (byte)(cuint & 0xff);
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return Color.FromArgb(a, r, g, b);
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}
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case 7:
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{
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var cuint = Convert.ToUInt32(colorString.Substring(1), 16);
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var r = (byte)((cuint >> 16) & 0xff);
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var g = (byte)((cuint >> 8) & 0xff);
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var b = (byte)(cuint & 0xff);
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return Color.FromArgb(255, r, g, b);
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}
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case 5:
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{
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var cuint = Convert.ToUInt16(colorString.Substring(1), 16);
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var a = (byte)(cuint >> 12);
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var r = (byte)((cuint >> 8) & 0xf);
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var g = (byte)((cuint >> 4) & 0xf);
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var b = (byte)(cuint & 0xf);
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a = (byte)(a << 4 | a);
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r = (byte)(r << 4 | r);
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g = (byte)(g << 4 | g);
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b = (byte)(b << 4 | b);
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return Color.FromArgb(a, r, g, b);
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}
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case 4:
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{
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var cuint = Convert.ToUInt16(colorString.Substring(1), 16);
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var r = (byte)((cuint >> 8) & 0xf);
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var g = (byte)((cuint >> 4) & 0xf);
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var b = (byte)(cuint & 0xf);
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r = (byte)(r << 4 | r);
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g = (byte)(g << 4 | g);
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b = (byte)(b << 4 | b);
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return Color.FromArgb(255, r, g, b);
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}
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default: return ThrowFormatException();
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}
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}
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if (colorString.Length > 3 && colorString[0] == 's' && colorString[1] == 'c' && colorString[2] == '#')
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{
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var values = colorString.Split(',');
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if (values.Length == 4)
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{
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var scA = double.Parse(values[0].Substring(3), CultureInfo.InvariantCulture);
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var scR = double.Parse(values[1], CultureInfo.InvariantCulture);
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var scG = double.Parse(values[2], CultureInfo.InvariantCulture);
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var scB = double.Parse(values[3], CultureInfo.InvariantCulture);
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return Color.FromArgb((byte)(scA * 255), (byte)(scR * 255), (byte)(scG * 255), (byte)(scB * 255));
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}
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if (values.Length == 3)
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{
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var scR = double.Parse(values[0].Substring(3), CultureInfo.InvariantCulture);
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var scG = double.Parse(values[1], CultureInfo.InvariantCulture);
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var scB = double.Parse(values[2], CultureInfo.InvariantCulture);
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return Color.FromArgb(255, (byte)(scR * 255), (byte)(scG * 255), (byte)(scB * 255));
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}
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return ThrowFormatException();
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}
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var prop = typeof(Colors).GetTypeInfo().GetDeclaredProperty(colorString);
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if (prop != null)
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{
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return (Color)prop.GetValue(null);
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}
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return ThrowFormatException();
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static void ThrowArgumentException() => throw new ArgumentException("The parameter \"colorString\" must not be null or empty.");
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static Color ThrowFormatException() => throw new FormatException("The parameter \"colorString\" is not a recognized Color format.");
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}
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}
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} |