TextServicesPropertyRanges.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 / Framework / System / Windows / Documents / TextServicesPropertyRanges.cs / 1305600 / TextServicesPropertyRanges.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: TextServicesPropertyRanges.cs 
//
// History: 
//  08/01/2003 : yutakas - Ported from dotnet tree.
//
//---------------------------------------------------------------------------
 
using System;
using System.Runtime.InteropServices; 
using System.Windows.Threading; 
using System.Security;
using System.Security.Permissions; 

using System.Collections;
using System.Diagnostics;
using System.Windows.Media; 
using System.Windows.Input;
using System.Windows.Documents; 
using MS.Win32; 

namespace System.Windows.Documents 
{
    //-----------------------------------------------------
    //
    //  TextServicesPropertyRanges class 
    //
    //----------------------------------------------------- 
 
    /// 
    ///   The base class for property ranges of EditRecord 
    /// 
    internal class TextServicesPropertyRanges
    {
        //------------------------------------------------------ 
        //
        //  Constructors 
        // 
        //-----------------------------------------------------
 
        internal TextServicesPropertyRanges(
            TextStore textstore,
            Guid guid)
        { 
            _guid = guid;
            _textstore = textstore; 
        } 

        //------------------------------------------------------ 
        //
        //  Internal Method
        //
        //------------------------------------------------------ 

        ///  
        ///    OnRange virtual method. 
        /// 
        internal virtual void OnRange(UnsafeNativeMethods.ITfProperty property, 
                                      int ecReadonly,
                                      UnsafeNativeMethods.ITfRange range)
        {
        } 

        ///  
        ///    Calback function for TextEditSink 
        ///    we track the property change here.
        ///  
        /// 
        /// Critical - calls unmanaged code, commits raw input to the system
        /// 
        [SecurityCritical] 
        internal virtual void OnEndEdit(UnsafeNativeMethods.ITfContext context,
                                        int ecReadOnly, 
                                        UnsafeNativeMethods.ITfEditRecord editRecord) 
        {
            int fetched; 
            UnsafeNativeMethods.IEnumTfRanges ranges;
            UnsafeNativeMethods.ITfProperty prop = null;

            ranges = GetPropertyUpdate(editRecord); 

            UnsafeNativeMethods.ITfRange [] outRanges; 
            outRanges = new UnsafeNativeMethods.ITfRange[1]; 
            while (ranges.Next(1, outRanges, out fetched) == 0)
            { 
                //
                // check the element has enabled dynamic property.
                //
                ITextPointer start; 
                ITextPointer end;
 
                ConvertToTextPosition(outRanges[0], out start, out end); 

                if (prop == null) 
                    context.GetProperty(ref _guid, out prop);

                UnsafeNativeMethods.IEnumTfRanges rangesProp;
 
                if (prop.EnumRanges(ecReadOnly, out rangesProp, outRanges[0]) == 0)
                { 
                    UnsafeNativeMethods.ITfRange [] outRangesProp; 
                    outRangesProp = new UnsafeNativeMethods.ITfRange[1];
                    while (rangesProp.Next(1, outRangesProp, out fetched) == 0) 
                    {
                        OnRange(prop, ecReadOnly, outRangesProp[0]);
                        Marshal.ReleaseComObject(outRangesProp[0]);
                    } 
                    Marshal.ReleaseComObject(rangesProp);
                } 
 
                Marshal.ReleaseComObject(outRanges[0]);
 
            }
            Marshal.ReleaseComObject(ranges);
            if (prop != null)
                Marshal.ReleaseComObject(prop); 
        }
 
        //----------------------------------------------------- 
        //
        //  Protected Method 
        //
        //------------------------------------------------------

        ///  
        ///    Convert ITfRange to two TextPositions.
        ///  
        ///  
        /// Critical - calls unmanaged code (GetExtent)
        ///  
        [SecurityCritical]
        protected void ConvertToTextPosition(UnsafeNativeMethods.ITfRange range,
                                               out ITextPointer start,
                                               out ITextPointer end) 
        {
            UnsafeNativeMethods.ITfRangeACP rangeACP; 
            int startIndex; 
            int length;
 
            rangeACP = range as UnsafeNativeMethods.ITfRangeACP;
            rangeACP.GetExtent(out startIndex, out length);

            if (length < 0) 
            {
                // Cicero bug!  Length should never be less than zero. 
                start = null; 
                end = null;
            } 
            else
            {
                start = _textstore.CreatePointerAtCharOffset(startIndex, LogicalDirection.Forward);
                end = _textstore.CreatePointerAtCharOffset(startIndex + length, LogicalDirection.Forward); 
            }
        } 
 
        /// 
        ///    Get Cicero property value. 
        /// 
        /// 
        /// Critical - calls unmanaged code (GetValue) and expose the returned object directly.
        ///            It could be any variant in a Cicero property in general. 
        ///            non Avalon derived class is blocked by link demand
        ///  
        [UIPermissionAttribute(SecurityAction.LinkDemand, Unrestricted= true)] 
        [SecurityCritical]
        protected static Object GetValue(int ecReadOnly, UnsafeNativeMethods.ITfProperty property, UnsafeNativeMethods.ITfRange range) 
        {
            if (property == null)
                return null;
 
            Object obj;
            property.GetValue(ecReadOnly, range, out obj); 
 
            return obj;
        } 

        /// 
        ///    Get ranges that the property is changed.
        ///  
        /// 
        /// Critical - unsafe block to manipulate a pointer of a pointer to GUID. 
        ///  
        [SecurityCritical]
        private UnsafeNativeMethods.IEnumTfRanges GetPropertyUpdate( 
                                UnsafeNativeMethods.ITfEditRecord editRecord)
        {
            UnsafeNativeMethods.IEnumTfRanges ranges;
 
            unsafe
            { 
                fixed (Guid *pguid = &_guid) 
                {
                    // 
                    //


 

 
 

 



 

                    IntPtr p = (IntPtr)pguid; 
                    editRecord.GetTextAndPropertyUpdates(0, ref p, 1, out ranges); 
                }
            } 
            return ranges;
        }

        //----------------------------------------------------- 
        //
        //  Protected Properties 
        // 
        //-----------------------------------------------------
 
        /// 
        ///    GUID of ITfProperty
        /// 
        protected Guid Guid 
        {
            get 
            { 
                return _guid;
            } 
        }

        /// 
        ///    Return TextStore that is associated to this property. 
        /// 
        protected TextStore TextStore 
        { 
            get
            { 
                return _textstore;
            }
        }
 
        //-----------------------------------------------------
        // 
        //  Private Field 
        //
        //------------------------------------------------------ 

        // GUID of ITfProperty
        private Guid _guid;
 
        // The refrence of TextStore.
        private TextStore _textstore; 
    } 
}

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

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