InputLanguageSource.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / InputLanguageSource.cs / 1305600 / InputLanguageSource.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: The source of the input language of the thread. 
//
// History: 
//  07/30/2003 : yutakas - ported from dotnet tree.
//
//---------------------------------------------------------------------------
using System.Security; 
using System.Security.Permissions;
using System.Collections; 
using System.Globalization; 
using System.Windows.Threading;
using System.Windows.Input; 
using System.Windows.Media;
using System.Runtime.InteropServices;
using System.Diagnostics;
 
using MS.Win32;
using MS.Utility; 
 
namespace System.Windows.Input
{ 
    //-----------------------------------------------------
    //
    //  InputLanguageSource class
    // 
    //-----------------------------------------------------
 
    ///  
    /// This is an internal. The source for input languages.
    ///  
    internal sealed class InputLanguageSource : IInputLanguageSource, IDisposable
    {
        //------------------------------------------------------
        // 
        //  Constructors
        // 
        //----------------------------------------------------- 

        ///  
        ///    This is an internal. The source for input languages.
        /// 
        internal InputLanguageSource(InputLanguageManager inputlanguagemanager)
        { 
            _inputlanguagemanager = inputlanguagemanager;
 
            // initialize the current input language. 
            _langid = (short)NativeMethods.IntPtrToInt32(SafeNativeMethods.GetKeyboardLayout(0));
 
            // store the dispatcher thread id. This will be used to call GetKeyboardLayout() from
            // other thread.
            _dispatcherThreadId = SafeNativeMethods.GetCurrentThreadId();
 
            // Register source
            _inputlanguagemanager.RegisterInputLanguageSource(this); 
        } 

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

        #region Public Methods 
 
        /// 
        ///    Dispose method. 
        /// 
        public void Dispose()
        {
             if (_ipp != null) 
                 Uninitialize();
        } 
 
        /// 
        ///    IIInputLanguageSource.Initialize() 
        ///    This creates ITfInputProcessorProfile object and advice sink.
        /// 
        public void Initialize()
        { 
            EnsureInputProcessorProfile();
        } 
 
        /// 
        ///    IIInputLanguageSource.Uninitialize() 
        ///    This releases ITfInputProcessorProfile object and unadvice sink.
        /// 
        public void Uninitialize()
        { 
            if (_ipp != null)
            { 
                _ipp.Uninitialize(); 
                _ipp = null;
            } 
        }

        #endregion Public Methods
 
        //-----------------------------------------------------
        // 
        //  Public Properties 
        //
        //------------------------------------------------------ 

        /// 
        ///    returns the current input language of this win32 thread.
        ///  
        public CultureInfo CurrentInputLanguage
        { 
            get 
            {
                return new CultureInfo(_CurrentInputLanguage); 
            }
            set
            {
                _CurrentInputLanguage = (short)value.LCID; 
            }
        } 
 
        /// 
        ///    returns the list of the available input languages of this win32 thread. 
        /// 
        public IEnumerable InputLanguageList
        {
             get 
             {
                EnsureInputProcessorProfile(); 
 
                if (_ipp == null)
                { 
                    ArrayList al = new ArrayList();
                    al.Add(CurrentInputLanguage);
                    return al;
                } 
                return _ipp.InputLanguageList;
             } 
        } 

        //----------------------------------------------------- 
        //
        //  Internal Methods
        //
        //----------------------------------------------------- 

        ///  
        ///    The input language change call back from the sink. 
        /// 
        internal bool OnLanguageChange(short langid) 
        {
            if (_langid != langid)
            {
                // Call InputLanguageManager if its current source is this. 
                if (InputLanguageManager.Current.Source == this)
                { 
                    return InputLanguageManager.Current.ReportInputLanguageChanging(new CultureInfo(langid), new CultureInfo(_langid)); 
                }
            } 

            return true;
        }
 
        /// 
        ///    The input language changed call back from the sink. 
        ///  
        internal void OnLanguageChanged()
        { 
            short langid = _CurrentInputLanguage;
            if (_langid != langid)
            {
                short prevlangid = _langid; 
                _langid = langid;
 
                // Call InputLanguageManager if its current source is this. 
                if (InputLanguageManager.Current.Source == this)
                { 
                    InputLanguageManager.Current.ReportInputLanguageChanged(new CultureInfo(langid), new CultureInfo(prevlangid));
                }
            }
        } 

        //----------------------------------------------------- 
        // 
        //  Private Method
        // 
        //------------------------------------------------------

        /// 
        ///    This creates ITfInputProcessorProfile object and advice sink. 
        /// 
        ///  
        /// Critical - calls unmanaged code (initializing input) 
        /// TreatAsSafe - ok to call any number of times
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        private void EnsureInputProcessorProfile()
        {
            // _ipp has been initialzied. Don't do this again. 
            if (_ipp != null)
                return; 
 
            // We don't need to initialize _ipp if there is onlyone keyboard layout.
            // Only one input language is available. 
            if (SafeNativeMethods.GetKeyboardLayoutList(0, null) <= 1)
                return;

            Debug.Assert(_ipp == null, "_EnsureInputProcesoorProfile has been called."); 

            InputLanguageProfileNotifySink lpns; 
            lpns = new InputLanguageProfileNotifySink(this); 
            _ipp= new InputProcessorProfiles();
 
            if (!_ipp.Initialize(lpns))
            {
                _ipp = null;
            } 
        }
 
        //----------------------------------------------------- 
        //
        //  Private Properties 
        //
        //------------------------------------------------------

        ///  
        ///    The current input language in LANGID of this win32 thread.
        ///  
        private short _CurrentInputLanguage 
        {
            get 
            {
                // Return input language of the dispatcher thread.
                return (short)NativeMethods.IntPtrToInt32(SafeNativeMethods.GetKeyboardLayout(_dispatcherThreadId));
            } 
            set
            { 
                EnsureInputProcessorProfile(); 

                if (_ipp != null) 
                {
                    _ipp.CurrentInputLanguage = value;
                }
            } 
        }
 
        //------------------------------------------------------ 
        //
        //  Private Fields 
        //
        //-----------------------------------------------------

        #region Private Fields 

        // the current input language in LANGID. 
        private short _langid; 

        // The dispatcher thread id. 
        private int _dispatcherThreadId;

        // the connected input language manager.
        InputLanguageManager _inputlanguagemanager; 

        // the reference to ITfInputProcessorProfile. 
        InputProcessorProfiles _ipp; 

        #endregion Private Fields 

    }

} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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InputLanguageSource.cs source code in C# .NET

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