Color extension class-ColorExtensions, devcolorextensions

Color extension class-ColorExtensions, devcolorextensions

/// <Summary> /// color extension class /// </summary> public static class ColorExtensions {// <summary> ///. NET pre-defined system Color cache list /// </summary> private static readonly Dictionary <int, Color> ColorCache; /// <summary> /// list of system color names with the same color code value // </summary> private static readonly Dictionary <int, string []> DuplicateColorNameCache; /// <summary> /// static constructor /// </summary> static ColorExtensions () {ColorCache = new Dictiona Ry <int, Color> (); DuplicateColorNameCache = new Dictionary <int, string []> (); Type type = typeof (Color); var properties = type. getProperties (BindingFlags. public | BindingFlags. static | BindingFlags. ignoreCase); foreach (var propertyInfo in properties) {var value = propertyInfo. getValue (null, null); if (value is Color) {var color = (Color) value; var intCode = color. toIntCode (); if (! ColorCache. containsKey (intCode) {ColorCache. add (intCode, color);} else {if (DuplicateColorNameCache. containsKey (intCode) {var values = DuplicateColorNameCache [intCode]. toList (); values. add (color. name); DuplicateColorNameCache [intCode] = values. toArray ();} else {string [] values = {ColorCache [intCode]. name, color. name}; DuplicateColorNameCache [intCode] = values ;}}}/// <summary> /// Returns the color value in decimal format. The value ranges from 0 ~ 16777215. /// <Para> for example, 0 indicates black and 16777215 indicates white. </Para> /// </summary> /// <param name = "color"> Color object </param> /// <returns> color value in decimal format </returns> public static int ToIntCode (this Color color) {int c = color. r; c = c | color. G <8; c = c | color. B <16; return c; // the following code is equivalent. // convert the code to a hexadecimal value and then a hexadecimal value. // var hexCode = color. toHexCode (false); // obtain the color code value in hexadecimal format // int intCode = Convert. toInt32 (hexCode, 16); // obtain the color code value in decimal format} // <summary> // return the color value in hexadecimal format. /// <Para> for example, Color. Gray (Gray) returns #808080. Color. fromArgb (192,192,192) returns # C0C0C0 </para> /// </summary> /// <param name = "color"> Color object </param> /// <param name = "isAddPrefix "> whether to add a prefix "#", the default value is true. </Param> // <returns> hexadecimal Color value </returns> public static string ToHexCode (this color, bool isAddPrefix = true) {return string. format ("{0} {1: X2} {2: X2} {3: X2}", isAddPrefix? "#": String. empty, color. r, color. g, color. b); // The following method is encountered. NET pre-defined color object, will return the color name, instead of the hexadecimal value. // Return ColorTranslator. toHtml (color) ;}/// <summary> // return the color code value supported by HTML. If the color is already predefined in HTML, the color name is returned, otherwise, the code value in hexadecimal format is returned. /// <Para> for example, Color. Gray (Gray) returns Gray. Color. fromArgb (192,192,192) returns # C0C0C0 (silver) </para> // <para> for example, this is because the color code value has been predefined in HTML, therefore, HTML supports the name value corresponding to the color code value. </Para> /// <para>. NET has three pairs of pre-defined color code values are the same, so when the input color object in the ARGB representation is in the pre-defined color range of the three pairs, only one color name in a pair is returned. </Para> /// <para> When You Need To Know another color name, you can </para> /// </summary> /// <param name = "color"> Color object </param> /// <returns> If the color is already predefined in HTML, otherwise, the code value in hexadecimal format </returns> public static string ToHtmlCode (this Color color) {int intCode = color. toIntCode (); if (ColorCache. containsKey (intCode) {return ColorTranslator. toHtml (ColorCache [intCode]);}/** the reason for this is that when the user uploads a Color object represented by ARGB. * After the above processing, the color name can be returned successfully. * Example: Color color1 = Color. gray; // Gray * Color color2 = Color. fromArgb (color1.A, color1.R, color1.G, color1. B); * color1.ToHtmlCode () returns "Gray" * color2.ToHtmlCode () returns "#808080 ". * In fact, the above two Color objects are equal. It is reasonable for these two objects to call the ToHtmlCode () Extension Method to return the same result. */Return ColorTranslator. ToHtml (color) ;}/// <summary> // gets an array of color names with the same code value. If no, null is returned. /// </Summary> /// <param name = "color"> Color object </param> /// <returns> returns an array of color names with the same code value, if no, null is returned. </Returns> public static string [] GetDuplicateColorNames (this Color color) {int intCode = color. toIntCode (); if (DuplicateColorNameCache. containsKey (intCode) {return DuplicateColorNameCache [intCode];} return null ;} /// <summary> /// convert the Color code value of the decimal format to the Color object // </summary> /// <param name = "intCode"> Color in decimal format code value </param> /// <returns> returns the Color object </returns> public static Color IntToColor (int intCode) {I F (ColorCache. containsKey (intCode) {return ColorCache [intCode];}/** the preceding processing is the same as the ToHtmlCode Method * first checks whether it is consistent.. NET pre-defined color match. If yes, return.. NET pre-defined color object (this object contains a color-friendly name that can be understood directly ). * If it does not match, the Color object represented by ARGB is returned. */String hexCode = Convert. toString (intCode, 16); return ColorTranslator. fromHtml ("#" + hexCode);} // <summary> // convert the color code value of the hexadecimal format starting with "#" or.. NET pre-defined Color name: Color object // </summary> /// <param name = "hexCodeOrColorName">. NET predefined Color name or hexadecimal Color code value starting with "#" </param> // <returns> </returns> public static Color HexOrNameToColor (string hexCodeOrColorName) {if (string. isNullOrEmpty (hexCodeOrColorName) {return Color. empty;} try {// This is hex code. if (hexCodeOrColorName [0] = '#') {string hexCode = hexCodeOrColorName. substring (1); int intCode = Convert. toInt32 (hexCode, 16); if (ColorCache. containsKey (intCode) {// return the Color object return ColorCache [intCode] with a friendly name;} // return the Color object return ColorTranslator in the argb format. fromHtml (hexCodeOrColorName);} // This is color name. return ColorTranslator. fromHtml (hexCodeOrColorName);} catch (Exception) {return Color. empty ;}}}