TextComposition.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Input / TextComposition.cs / 1 / TextComposition.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: TextComposition class is the object that contains 
//              the input text. The text from keyboard input 
//              is packed in this class when TextInput event is generated.
//              And this class also packs the state of the composition text when 
//              the input text is being composed (for EA input, Speech).
//
// History:
//  11/18/2003 : [....] created 
//
//--------------------------------------------------------------------------- 
 
using System;
using System.ComponentModel; 
using System.Diagnostics;
using System.Text;
using System.Windows.Threading;
using System.Windows; 
using System.Security;
using System.Security.Permissions; 
using MS.Win32; 

using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID;

namespace System.Windows.Input
{ 
    //-----------------------------------------------------
    // 
    //  TextCompositionAutoComplete enum 
    //
    //----------------------------------------------------- 

    /// 
    /// The switch for automatic termination of the text composition
    ///  
    public enum TextCompositionAutoComplete
    { 
        ///  
        /// AutomaticComplete is off.
        ///  
        Off = 0,

        /// 
        /// AutomaticComplete is on. 
        /// TextInput event will be generated automatically by TextCompositionManager after
        /// TextInputStart event is processed. 
        ///  
        On  = 1,
    } 

    internal enum TextCompositionStage
    {
        ///  
        /// The composition is not started yet.
        ///  
        None = 0, 

        ///  
        /// The composition has started.
        /// 
        Started  = 1,
 
        /// 
        /// The composition has completed or canceled. 
        ///  
        Done  = 2,
    } 

    /// 
    ///     Text Composition class contains the result text of the text input and the state of the composition text.
    ///  
    public class TextComposition : DispatcherObject
    { 
        //------------------------------------------------------ 
        //
        //  Constructors 
        //
        //-----------------------------------------------------

        #region Constructors 

        ///  
        ///     The constrcutor of TextComposition class. 
        /// 
        public TextComposition(InputManager inputManager, IInputElement source, string resultText) : this(inputManager, source,  resultText, TextCompositionAutoComplete.On) 
        {
        }

        ///  
        ///     The constrcutor of TextComposition class.
        ///  
        ///  
        ///     Critical: This code peeks Into InputManager.Current
        ///     PublicOK: It does not expose the InputManager and keyboard device is safe to expose 
        /// 
        [SecurityCritical]
        public TextComposition(InputManager inputManager, IInputElement source, string resultText, TextCompositionAutoComplete autoComplete) : this(inputManager, source, resultText, autoComplete, InputManager.Current.PrimaryKeyboardDevice)
        { 
            // We should avoid using Enum.IsDefined for performance and correct versioning.
            if ((autoComplete != TextCompositionAutoComplete.Off) && 
                (autoComplete != TextCompositionAutoComplete.On)) 
            {
                throw new InvalidEnumArgumentException("TextCompositionAutoComplete", 
                                                       (int)autoComplete,
                                                       typeof(TextCompositionAutoComplete));
            }
        } 

        // 
        // An internal constructore to specify InputDevice directly. 
        //
        /// 
        ///     Critical - stores critical data ( _inputManager).
        ///     TreatAsSafe - inputmanager is stored in a non-public critical member. Usage of InputManager is tracked.
        ///
        [SecurityCritical, SecurityTreatAsSafe ] 
        internal TextComposition(InputManager inputManager, IInputElement source, string resultText, TextCompositionAutoComplete autoComplete, InputDevice inputDevice)
        { 
            _inputManager = inputManager; 

            _inputDevice = inputDevice; 

            if (resultText == null)
            {
                throw new ArgumentException(SR.Get(SRID.TextComposition_NullResultText)); 
            }
 
            _resultText = resultText; 
            _compositionText = "";
            _systemText = ""; 
            _systemCompositionText = "";
            _controlText = "";

            _autoComplete = autoComplete; 

            _stage = TextCompositionStage.None; 
 
            // source of this text composition.
            _source = source; 
        }

        #endregion Constructors
 
        //------------------------------------------------------
        // 
        //  Public Methods 
        //
        //------------------------------------------------------ 

        /// 
        ///     Finalize the composition.
        ///  
        /// 
        ///     Callers must have UIPermission(PermissionState.Unrestricted) to call this API. 
        ///  
        /// 
        ///    Critical: Calls into CompleteComposition 
        ///    PublicOk: This operation is blocked from external consumers via a link demand
        /// 
        [SecurityCritical]
        [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] 
        public virtual void Complete()
        { 
//             VerifyAccess(); 

            TextCompositionManager.CompleteComposition(this); 
        }

        //-----------------------------------------------------
        // 
        //  Public Properties
        // 
        //------------------------------------------------------ 

        ///  
        ///     The result text of the text input.
        /// 
        [CLSCompliant(false)]
        public string Text 
        {
            get 
            { 
//                 VerifyAccess();
                return _resultText; 
            }
            protected set
            {
//                 VerifyAccess(); 
                _resultText = value;
            } 
        } 

        ///  
        ///     The current composition text.
        /// 
        [CLSCompliant(false)]
        public string CompositionText 
        {
            get 
            { 
//                 VerifyAccess();
                return _compositionText; 
            }

            protected set
            { 
//                 VerifyAccess();
                _compositionText = value; 
            } 
        }
 
        /// 
        ///     The current system text.
        /// 
        [CLSCompliant(false)] 
        public string SystemText
        { 
            get 
            {
//                 VerifyAccess(); 
                return _systemText;
            }

            protected set 
            {
//                 VerifyAccess(); 
                _systemText = value; 
            }
        } 

        /// 
        ///     The current system text.
        ///  
        [CLSCompliant(false)]
        public string ControlText 
        { 
            get
            { 
//                 VerifyAccess();
                return _controlText;
            }
 
            protected set
            { 
//                 VerifyAccess(); 
                _controlText = value;
            } 
        }

        /// 
        ///     The current system text. 
        /// 
        [CLSCompliant(false)] 
        public string SystemCompositionText 
        {
            get 
            {
//                 VerifyAccess();
                return _systemCompositionText;
            } 

            protected set 
            { 
//                 VerifyAccess();
                _systemCompositionText = value; 
            }
        }

        ///  
        ///     The switch for automatic termination.
        ///  
        public TextCompositionAutoComplete AutoComplete 
        {
            get 
            {
//                 VerifyAccess();
                return _autoComplete;
            } 
        }
 
 
        //-----------------------------------------------------
        // 
        //  Public Events
        //
        //-----------------------------------------------------
 
        //-----------------------------------------------------
        // 
        //  Protected Methods 
        //
        //------------------------------------------------------ 

        //-----------------------------------------------------
        //
        //  Internal Methods 
        //
        //------------------------------------------------------ 
 
        /// 
        ///     The current composition text. 
        /// 
        internal void SetText(string resultText)
        {
            _resultText = resultText; 
        }
 
        ///  
        ///     The current composition text.
        ///  
        internal void SetCompositionText(string compositionText)
        {
            _compositionText = compositionText;
        } 

 
        ///  
        ///     Convert this composition to system composition.
        ///  
        internal void MakeSystem()
        {
            _systemText = _resultText;
            _systemCompositionText = _compositionText; 

            _resultText = ""; 
            _compositionText = ""; 
            _controlText = "";
        } 

        /// 
        ///     Convert this composition to system composition.
        ///  
        internal void MakeControl()
        { 
            // Onlt control char should be in _controlText. 
            Debug.Assert((_resultText.Length == 1) && Char.IsControl(_resultText[0]));
 
            _controlText = _resultText;

            _resultText = "";
            _systemText = ""; 
            _compositionText = "";
            _systemCompositionText = ""; 
        } 

        ///  
        ///     Clear all the current texts.
        /// 
        internal void ClearTexts()
        { 
            _resultText = "";
            _compositionText = ""; 
            _systemText = ""; 
            _systemCompositionText = "";
            _controlText = ""; 
        }

        //------------------------------------------------------
        // 
        //  Internal Properties
        // 
        //----------------------------------------------------- 

        ///  
        ///     The source of this text composition.
        /// 
        internal IInputElement Source
        { 
            get
            { 
                return _source; 
            }
        } 

        // return the input device for this text composition.
        internal InputDevice _InputDevice
        { 
            get {return _inputDevice;}
        } 
 
        // return the input manager for this text composition.
        /// 
        ///  Gives out critical data.
        ///

        internal InputManager _InputManager 
        {
            [SecurityCritical] 
            get 
            {
                return _inputManager; 
            }
        }

        // the stage of this text composition 
        internal TextCompositionStage Stage
        { 
            get {return _stage;} 
            set {_stage = value;}
        } 

        //------------------------------------------------------
        //
        //  Internal Events 
        //
        //----------------------------------------------------- 
 
        //-----------------------------------------------------
        // 
        //  Private Methods
        //
        //-----------------------------------------------------
 
        //------------------------------------------------------
        // 
        //  Private Properties 
        //
        //----------------------------------------------------- 

        //------------------------------------------------------
        //
        //  Private Fields 
        //
        //------------------------------------------------------ 
 
        // InputManager for this TextComposition.
        /// 
        ///     Critical data. InputManager ctor is critical.
        ///
        [SecurityCritical]
        private readonly InputManager _inputManager; 

        // InputDevice for this TextComposition. 
        private readonly InputDevice _inputDevice; 

        // The finalized and result string. 
        private string _resultText;

        // The composition string.
        private string _compositionText; 

        // The system string. 
        private string _systemText; 

        // The control string. 
        private string _controlText;

        // The system composition string.
        private string _systemCompositionText; 

        // If this is true, TextComposition Manager will terminate the compositon automatically. 
        private readonly TextCompositionAutoComplete _autoComplete; 

        // TextComposition stage. 
        private TextCompositionStage _stage;

        // source of this text composition.
        private IInputElement _source; 
    }
} 

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