Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / WebBrowserHelper.cs / 1 / WebBrowserHelper.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System.Runtime.Serialization.Formatters.Binary; using System.Threading; using System.Configuration.Assemblies; using System.Runtime.Remoting; using System.Runtime.InteropServices; using System.Runtime.Serialization; using System.ComponentModel; using System.Diagnostics; using System; using System.Reflection; using System.Globalization; using System.Security.Permissions; using Microsoft.Win32; using System.Collections; using System.Collections.Specialized; using System.IO; using System.Drawing; using System.Windows.Forms.Design; using System.Windows.Forms.ComponentModel; using System.Windows.Forms.ComponentModel.Com2Interop; using System.ComponentModel.Design; using System.Windows.Forms; using System.Drawing.Imaging; using System.Drawing.Design; namespace System.Windows.Forms { // // This class contains static properties/methods that are internal. // It also has types that make sense only for ActiveX hosting classes. // In other words, this is a helper class for the ActiveX hosting classes. // internal static class WebBrowserHelper { // // Types: // // // Enumeration of the different states of the ActiveX control internal enum AXState { Passive = 0, // Not loaded Loaded = 1, // Loaded, but no server [ocx created] Running = 2, // Server running, invisible [depersisted] InPlaceActive = 4, // Server in-place active [visible] UIActive = 8 // Used only by WebBrowserSiteBase } // // Enumeration of the different Edit modes internal enum AXEditMode { None = 0, // object not being edited Object = 1, // object provided an edit verb and we invoked it Host = 2 // we invoked our own edit verb }; // // Enumeration of Selection Styles internal enum SelectionStyle { NotSelected = 0, Selected = 1, Active = 2 }; // // Static members: // // // BitVector32 masks for various internal state flags. internal static readonly int sinkAttached = BitVector32.CreateMask(); internal static readonly int manualUpdate = BitVector32.CreateMask(sinkAttached); internal static readonly int setClientSiteFirst = BitVector32.CreateMask(manualUpdate); internal static readonly int addedSelectionHandler = BitVector32.CreateMask(setClientSiteFirst); internal static readonly int siteProcessedInputKey = BitVector32.CreateMask(addedSelectionHandler); internal static readonly int inTransition = BitVector32.CreateMask(siteProcessedInputKey); internal static readonly int processingKeyUp = BitVector32.CreateMask(inTransition); internal static readonly int isMaskEdit = BitVector32.CreateMask(processingKeyUp); internal static readonly int recomputeContainingControl = BitVector32.CreateMask(isMaskEdit); // // Gets the LOGPIXELSX of the screen DC. private static int logPixelsX = -1; private static int logPixelsY = -1; private const int HMperInch = 2540; // // Special guids private static Guid ifont_Guid = typeof(UnsafeNativeMethods.IFont).GUID; internal static Guid windowsMediaPlayer_Clsid = new Guid("{22d6f312-b0f6-11d0-94ab-0080c74c7e95}"); internal static Guid comctlImageCombo_Clsid = new Guid("{a98a24c0-b06f-3684-8c12-c52ae341e0bc}"); internal static Guid maskEdit_Clsid = new Guid("{c932ba85-4374-101b-a56c-00aa003668dc}"); // // Window message to check if we have already sub-classed internal static readonly int REGMSG_MSG = SafeNativeMethods.RegisterWindowMessage(Application.WindowMessagesVersion + "_subclassCheck"); internal const int REGMSG_RETVAL = 123; // // Static helper methods: // internal static int Pix2HM(int pix, int logP) { return(HMperInch * pix + ( logP >> 1)) / logP; } internal static int HM2Pix(int hm, int logP) { return(logP * hm + HMperInch / 2) / HMperInch; } // // We cache LOGPIXELSX for optimization internal static int LogPixelsX { get { if (logPixelsX == -1) { IntPtr hDC = UnsafeNativeMethods.GetDC(NativeMethods.NullHandleRef); if (hDC != IntPtr.Zero) { logPixelsX = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(null, hDC), NativeMethods.LOGPIXELSX); UnsafeNativeMethods.ReleaseDC(NativeMethods.NullHandleRef, new HandleRef(null, hDC)); } } return logPixelsX; } } internal static void ResetLogPixelsX() { logPixelsX = -1; } // // We cache LOGPIXELSY for optimization internal static int LogPixelsY { get { if (logPixelsY == -1) { IntPtr hDC = UnsafeNativeMethods.GetDC(NativeMethods.NullHandleRef); if (hDC != IntPtr.Zero) { logPixelsY = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(null, hDC), NativeMethods.LOGPIXELSY); UnsafeNativeMethods.ReleaseDC(NativeMethods.NullHandleRef, new HandleRef(null, hDC)); } } return logPixelsY; } } internal static void ResetLogPixelsY() { logPixelsY = -1; } // // Gets the selection service from the control's site internal static ISelectionService GetSelectionService(Control ctl) { ISite site = ctl.Site; if (site != null) { Object o = site.GetService(typeof(ISelectionService)); Debug.Assert(o == null || o is ISelectionService, "service must implement ISelectionService"); if (o is ISelectionService) { return(ISelectionService) o; } } return null; } // // Returns a big COMRECT internal static NativeMethods.COMRECT GetClipRect() { return new NativeMethods.COMRECT(new Rectangle(0, 0, 32000, 32000)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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