Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / WebColorConverter.cs / 1 / WebColorConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.Drawing; using System.Text; using System.Web.Util; using System.Web.UI; using System.Globalization; using System.Security.Permissions; ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class WebColorConverter : ColorConverter { private static Hashtable htmlSysColorTable; ////// /// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value is string) { string colorText = ((string)value).Trim(); Color c = Color.Empty; // empty color if (String.IsNullOrEmpty(colorText)) return c; // #RRGGBB notation is handled by ColorConverter if (colorText[0] == '#') { return base.ConvertFrom(context, culture, value); } // special case. HTML requires LightGrey, but System.Drawing.KnownColor has LightGray if (StringUtil.EqualsIgnoreCase(colorText, "LightGrey")) { return Color.LightGray; } // System color if (htmlSysColorTable == null) { InitializeHTMLSysColorTable(); } object o = htmlSysColorTable[colorText]; if (o != null) { return (Color)o; } } // ColorConverter handles all named and KnownColors return base.ConvertFrom(context, culture, value); } ////// /// public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if (destinationType == typeof(string)) { if (value != null) { Color c = (Color)value; if (c == Color.Empty) { return String.Empty; } /* if (c.IsKnownColor) { // Handle Web system colors and any 'special' named colors string colorString = null; switch (c.ToKnownColor()) { case KnownColor.ActiveBorder: colorString = "ActiveBorder"; break; case KnownColor.ActiveCaption: colorString = "ActiveCaption"; break; case KnownColor.AppWorkspace: colorString = "AppWorkspace"; break; case KnownColor.Desktop: colorString = "Background"; break; case KnownColor.Control: colorString = "ButtonFace"; break; case KnownColor.ControlLight: colorString = "ButtonHighlight"; break; case KnownColor.ControlDark: colorString = "ButtonShadow"; break; case KnownColor.ControlText: colorString = "ButtonText"; break; case KnownColor.ActiveCaptionText: colorString = "CaptionText"; break; case KnownColor.GrayText: colorString = "GrayText"; break; case KnownColor.HotTrack: case KnownColor.Highlight: colorString = "Highlight"; break; case KnownColor.HighlightText: colorString = "HighlightText"; break; case KnownColor.InactiveBorder: colorString = "InactiveBorder"; break; case KnownColor.InactiveCaption: colorString = "InactiveCaption"; break; case KnownColor.InactiveCaptionText: colorString = "InactiveCaptionText"; break; case KnownColor.Info: colorString = "InfoBackground"; break; case KnownColor.InfoText: colorString = "InfoText"; break; case KnownColor.Menu: colorString = "Menu"; break; case KnownColor.MenuText: colorString = "MenuText"; break; case KnownColor.ScrollBar: colorString = "Scrollbar"; break; case KnownColor.ControlDarkDark: colorString = "ThreeDDarkShadow"; break; case KnownColor.ControlLightLight: colorString = "ButtonHighlight"; break; case KnownColor.Window: colorString = "Window"; break; case KnownColor.WindowFrame: colorString = "WindowFrame"; break; case KnownColor.WindowText: colorString = "WindowText"; break; case KnownColor.LightGray: colorString = "LightGrey"; break; } if (colorString != null) { return colorString; } } */ if (c.IsKnownColor == false) { // in the Web scenario, colors should be formatted in #RRGGBB notation StringBuilder sb = new StringBuilder("#", 7); sb.Append((c.R).ToString("X2", CultureInfo.InvariantCulture)); sb.Append((c.G).ToString("X2", CultureInfo.InvariantCulture)); sb.Append((c.B).ToString("X2", CultureInfo.InvariantCulture)); return sb.ToString(); } } } return base.ConvertTo(context, culture, value, destinationType); } private static void InitializeHTMLSysColorTable() { Hashtable t = new Hashtable(StringComparer.OrdinalIgnoreCase); t["activeborder"] = Color.FromKnownColor(KnownColor.ActiveBorder); t["activecaption"] = Color.FromKnownColor(KnownColor.ActiveCaption); t["appworkspace"] = Color.FromKnownColor(KnownColor.AppWorkspace); t["background"] = Color.FromKnownColor(KnownColor.Desktop); t["buttonface"] = Color.FromKnownColor(KnownColor.Control); t["buttonhighlight"] = Color.FromKnownColor(KnownColor.ControlLightLight); t["buttonshadow"] = Color.FromKnownColor(KnownColor.ControlDark); t["buttontext"] = Color.FromKnownColor(KnownColor.ControlText); t["captiontext"] = Color.FromKnownColor(KnownColor.ActiveCaptionText); t["graytext"] = Color.FromKnownColor(KnownColor.GrayText); t["highlight"] = Color.FromKnownColor(KnownColor.Highlight); t["highlighttext"] = Color.FromKnownColor(KnownColor.HighlightText); t["inactiveborder"] = Color.FromKnownColor(KnownColor.InactiveBorder); t["inactivecaption"] = Color.FromKnownColor(KnownColor.InactiveCaption); t["inactivecaptiontext"] = Color.FromKnownColor(KnownColor.InactiveCaptionText); t["infobackground"] = Color.FromKnownColor(KnownColor.Info); t["infotext"] = Color.FromKnownColor(KnownColor.InfoText); t["menu"] = Color.FromKnownColor(KnownColor.Menu); t["menutext"] = Color.FromKnownColor(KnownColor.MenuText); t["scrollbar"] = Color.FromKnownColor(KnownColor.ScrollBar); t["threeddarkshadow"] = Color.FromKnownColor(KnownColor.ControlDarkDark); t["threedface"] = Color.FromKnownColor(KnownColor.Control); t["threedhighlight"] = Color.FromKnownColor(KnownColor.ControlLight); t["threedlightshadow"] = Color.FromKnownColor(KnownColor.ControlLightLight); t["window"] = Color.FromKnownColor(KnownColor.Window); t["windowframe"] = Color.FromKnownColor(KnownColor.WindowFrame); t["windowtext"] = Color.FromKnownColor(KnownColor.WindowText); htmlSysColorTable = t; } } }
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