Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Controls / ActiveXHelper.cs / 1305600 / ActiveXHelper.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // // // // Description: // Helper functions for ActiveX hosting // // Source copied from axhosthelper.cs // // // History // 04/17/05 KusumaV Created // //----------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Specialized; using System.Runtime.InteropServices; using System.Security; using MS.Win32; namespace MS.Internal.Controls { // // 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 class ActiveXHelper { // // Types: // // // Enumeration of the different states of the ActiveX control public enum ActiveXState { 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, // Server is UI active [ready to accept input] Open = 16 // Server is opened for editing [not used] } // // Static members: // // // BitVector32 masks for various internal state flags. public static readonly int sinkAttached = BitVector32.CreateMask(); public static readonly int inTransition = BitVector32.CreateMask(sinkAttached); public static readonly int processingKeyUp = BitVector32.CreateMask(inTransition); //[kusumav]These are from [....] code. These transforms were not working correctly //I used Avalon sizes but leaving these in here since they are used in TransformCoordinates //in ActiveXSite. It doesn't seem to be invoked by WebBrowser control // // Gets the LOGPIXELSX of the screen DC. private static int logPixelsX = -1; private static int logPixelsY = -1; private const int HMperInch = 2540; // Prevent compiler from generating public CTOR private ActiveXHelper() { } // // Static helper methods: // public static int Pix2HM(int pix, int logP) { return (HMperInch * pix + (logP >> 1)) / logP; } public static int HM2Pix(int hm, int logP) { return (logP * hm + HMperInch / 2) / HMperInch; } // // We cache LOGPIXELSX for optimization ////// Critical: This code calls critical code. /// TreatAsSafe: This information is safe to expose. /// public static int LogPixelsX { [SecurityCritical, SecurityTreatAsSafe] 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; } } public static void ResetLogPixelsX() { logPixelsX = -1; } // // We cache LOGPIXELSY for optimization ////// Critical: This code calls critical code. /// TreatAsSafe: This information is safe to expose. /// public static int LogPixelsY { [SecurityCritical, SecurityTreatAsSafe] 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; } } public static void ResetLogPixelsY() { logPixelsY = -1; } ////// Wraps a given managed object, expected to be enabled for IDispatch interop, in a native one that /// trivially delegates the IDispatch calls. This ensures that cross-context calls on the managed object /// occur on the same thread (assumed to be in an STA), not on some random RPC worker thread. /// ////// CLR objects are thread-agile. But nearly all COM objects we use are STA-bound, and we also need /// our implementations of COM interfaces to be called on the thread on which their object was created, /// often because of interacting with core WPF objects that also have thread affinity. /// Getting a CLR object to "stick to the right thread" when called from another context (like cross-process) /// turns out to be incredibly hard. [....] has solved the problem with StandardOleMarshalObject. /// Unfortunately, it wasn't designed to work in partial trust. And apart from that, it just doesn't /// seem to work cross-process, which is what we actually need for the WebOC hosting. /// There's also the ContextBoundObject family. A derived object could be made thread-bound. But this /// doesn't work for us either, because we get deadlocks. COM allows re-entrancy when "blocked" on an /// outgoing call from an STA, but ContextBoundObject apparently doesn't--it really blocks. /// ////// Critical because of SUC. /// Since wrapping a managed object in a native one that trivially delegates IDispatch calls is safe, /// a caller of this method can generally be marked SecurityTreatAsSafe. /// [SuppressUnmanagedCodeSecurity, SecurityCritical] [DllImport(ExternDll.PresentationHostDll, PreserveSig=false)] [return: MarshalAs(UnmanagedType.IDispatch)] internal static extern object CreateIDispatchSTAForwarder([MarshalAs(UnmanagedType.IDispatch)] object pDispatchDelegate); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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