Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / LinkUtilities.cs / 1 / LinkUtilities.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System; using System.Drawing; using System.Windows.Forms; using Microsoft.Win32; using System.Globalization; using System.Security.Permissions; internal class LinkUtilities { // IE fonts and colors static Color ielinkColor = Color.Empty; static Color ieactiveLinkColor = Color.Empty; static Color ievisitedLinkColor = Color.Empty; const string IESettingsRegPath = "Software\\Microsoft\\Internet Explorer\\Settings"; public const string IEMainRegPath = "Software\\Microsoft\\Internet Explorer\\Main"; const string IEAnchorColor = "Anchor Color"; const string IEAnchorColorVisited = "Anchor Color Visited"; const string IEAnchorColorHover = "Anchor Color Hover"; ////// /// Retrieves a named IE color from the registry. There are constants at the top /// of this file of the valid names to retrieve. /// private static Color GetIEColor(string name) { // SECREVIEW : We are just reading the IE color settings from the registry... // // SECUNDONE : This assert doesn't work... assert everything for now... // //new RegistryPermission(RegistryPermissionAccess.Read, "HKCU\\" + IESettingsRegPath).Assert(); new RegistryPermission(PermissionState.Unrestricted).Assert(); try { RegistryKey key = Registry.CurrentUser.OpenSubKey(IESettingsRegPath); if (key != null) { // Since this comes from the registry, be very careful about its contents. // string s = (string)key.GetValue(name); if (s != null) { string[] rgbs = s.Split(new char[] {','}); int[] rgb = new int[3]; int nMax = Math.Min(rgb.Length, rgbs.Length); //NOTE: if we can't parse rgbs[i], rgb[i] will be set to 0. for (int i = 0; i < nMax; i++) { int.TryParse(rgbs[i], out rgb[i]); } return Color.FromArgb(rgb[0], rgb[1], rgb[2]); } } if (string.Equals(name, IEAnchorColor, StringComparison.OrdinalIgnoreCase)) { return Color.Blue; } else if (string.Equals(name, IEAnchorColorVisited, StringComparison.OrdinalIgnoreCase)) { return Color.Purple; } else if (string.Equals(name, IEAnchorColorHover, StringComparison.OrdinalIgnoreCase)) { return Color.Red; } else { return Color.Red; } } finally { System.Security.CodeAccessPermission.RevertAssert(); } } public static Color IELinkColor { get { if (ielinkColor.IsEmpty) { ielinkColor = GetIEColor(IEAnchorColor); } return ielinkColor; } } public static Color IEActiveLinkColor { get { if (ieactiveLinkColor.IsEmpty) { ieactiveLinkColor = GetIEColor(IEAnchorColorHover); } return ieactiveLinkColor; } } public static Color IEVisitedLinkColor { get { if (ievisitedLinkColor.IsEmpty) { ievisitedLinkColor = GetIEColor(IEAnchorColorVisited); } return ievisitedLinkColor; } } ////// /// Retrieves the IE settings for link behavior from the registry. /// public static LinkBehavior GetIELinkBehavior() { // SECREVIEW : We are just reading the IE color settings from the registry... // // SECUNDONE : This assert doesn't work... assert everything for now... // //new RegistryPermission(RegistryPermissionAccess.Read, "HKCU\\" + IEMainRegPath).Assert(); new RegistryPermission(PermissionState.Unrestricted).Assert(); try { RegistryKey key = Registry.CurrentUser.OpenSubKey(IEMainRegPath); if (key != null) { string s = (string)key.GetValue("Anchor Underline"); if (s != null && string.Compare(s, "no", true, CultureInfo.InvariantCulture) == 0) { return LinkBehavior.NeverUnderline; } if (s != null && string.Compare(s, "hover", true, CultureInfo.InvariantCulture) == 0) { return LinkBehavior.HoverUnderline; } else { return LinkBehavior.AlwaysUnderline; } } } finally { System.Security.CodeAccessPermission.RevertAssert(); } return LinkBehavior.AlwaysUnderline; } public static void EnsureLinkFonts(Font baseFont, LinkBehavior link, ref Font linkFont, ref Font hoverLinkFont) { if (linkFont != null && hoverLinkFont != null) { return; } bool underlineLink = true; bool underlineHover = true; if (link == LinkBehavior.SystemDefault) { link = GetIELinkBehavior(); } switch (link) { case LinkBehavior.AlwaysUnderline: underlineLink = true; underlineHover = true; break; case LinkBehavior.HoverUnderline: underlineLink = false; underlineHover = true; break; case LinkBehavior.NeverUnderline: underlineLink = false; underlineHover = false; break; } Font f = baseFont; // We optimize for the "same" value (never & always) to avoid creating an // extra font object. // if (underlineHover == underlineLink) { FontStyle style = f.Style; if (underlineHover) { style |= FontStyle.Underline; } else { style &= ~FontStyle.Underline; } hoverLinkFont = new Font(f, style); linkFont = hoverLinkFont; } else { FontStyle hoverStyle = f.Style; if (underlineHover) { hoverStyle |= FontStyle.Underline; } else { hoverStyle &= ~FontStyle.Underline; } hoverLinkFont = new Font(f, hoverStyle); FontStyle linkStyle = f.Style; if (underlineLink) { linkStyle |= FontStyle.Underline; } else { linkStyle &= ~FontStyle.Underline; } linkFont = new Font(f, linkStyle); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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