DefaultTextStoreTextComposition.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / DefaultTextStoreTextComposition.cs / 1305600 / DefaultTextStoreTextComposition.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: DefaultTextStoreTextComposition class is the composition 
//              object for the input in DefaultTextStore. 
//              Cicero's composition injected to DefaulteTextStore is
//              represent by this DefaultTextStoreTextComposition. 
//              This has custom Complete method to control
//              Cicero's composiiton.
//
// History: 
//  04/01/2004 : yutakas created
// 
//--------------------------------------------------------------------------- 

using System; 
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Threading;
using System.Windows; 
using System.Security;
 
using MS.Win32; 

namespace System.Windows.Input 
{

    /// 
    ///     DefaultTextStoreTextComposition class implements Complete for 
    ///     the composition in DefaultTextStore.
    ///  
    internal class DefaultTextStoreTextComposition : TextComposition 
    {
 
        //-----------------------------------------------------
        //
        //  ctor
        // 
        //-----------------------------------------------------
 
        ///  
        ///     ctor
        ///  
        ///
        ///     Critical - calls base ctor - which in turn stores the inputmanager that's critical.
        ///
        [SecurityCritical] 
        internal DefaultTextStoreTextComposition(InputManager inputManager, IInputElement source, string text, TextCompositionAutoComplete autoComplete) : base(inputManager, source, text, autoComplete)
        { 
        } 

        //------------------------------------------------------ 
        //
        //  Public Interface Methods
        //
        //----------------------------------------------------- 

        ///  
        ///     Finalize the composition. 
        ///     This does not call base.Complete() because TextComposition.Complete()
        ///     will call TextServicesManager.CompleteComposition() directly to generate TextCompositionEvent. 
        ///     We finalize Cicero's composition and DefaultTextStore will automatically
        ///     generate the proper TextComposition events.
        /// 
        ///  
        ///   Critical: This completes the composition and in doing so calls GetTransitionaryContext which gives it ITfContext
        ///   TreatAsSafe: The context is not exposed, neither are the other members 
        ///  
        [SecurityCritical,SecurityTreatAsSafe]
        public override void Complete() 
        {
//             VerifyAccess();

            UnsafeNativeMethods.ITfContext context = GetTransitoryContext(); 
            UnsafeNativeMethods.ITfContextOwnerCompositionServices compositionService = context as UnsafeNativeMethods.ITfContextOwnerCompositionServices;
            UnsafeNativeMethods.ITfCompositionView composition = GetComposition(context); 
 
            if (composition != null)
            { 
                // Terminate composition if there is a composition view.
                compositionService.TerminateComposition(composition);
                Marshal.ReleaseComObject(composition);
            } 

            Marshal.ReleaseComObject(context); 
 
        }
 
        //------------------------------------------------------
        //
        //  private Methods
        // 
        //------------------------------------------------------
 
        ///  
        ///     Get the base ITfContext of the transitory document.
        ///  
        /// 
        ///   Critical: This exposes ITfContext which has unsecure methods
        /// 
        [SecurityCritical] 
        private UnsafeNativeMethods.ITfContext GetTransitoryContext()
        { 
            DefaultTextStore defaultTextStore = DefaultTextStore.Current; 
            UnsafeNativeMethods.ITfDocumentMgr doc = defaultTextStore.TransitoryDocumentManager;
            UnsafeNativeMethods.ITfContext context; 

            doc.GetBase(out context);

            Marshal.ReleaseComObject(doc); 
            return context;
        } 
 
        /// 
        ///     Get ITfContextView of the context. 
        /// 
        ///
        ///     Critical: calls Marshal.ReleaseComObject which has a LinkDemand
        ///	TreatAsSafe: can't pass in arbitrary COM object to release 
        ///
        [SecurityCritical, SecurityTreatAsSafe] 
        private UnsafeNativeMethods.ITfCompositionView GetComposition(UnsafeNativeMethods.ITfContext context) 
        {
            UnsafeNativeMethods.ITfContextComposition contextComposition; 
            UnsafeNativeMethods.IEnumITfCompositionView enumCompositionView;
            UnsafeNativeMethods.ITfCompositionView[] compositionViews = new UnsafeNativeMethods.ITfCompositionView[1];
            int fetched;
 
            contextComposition = (UnsafeNativeMethods.ITfContextComposition)context;
            contextComposition.EnumCompositions(out enumCompositionView); 
 
            enumCompositionView.Next(1, compositionViews, out fetched);
 
            Marshal.ReleaseComObject(enumCompositionView);
            return compositionViews[0];

        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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