TextServicesDisplayAttribute.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / TextServicesDisplayAttribute.cs / 1 / TextServicesDisplayAttribute.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: TextServicesDisplayAttribute 
//
// History: 
//  08/01/2003 : [....] - Ported from dotnet tree.
//
//---------------------------------------------------------------------------
 
using System.Runtime.InteropServices;
using System.Windows.Threading; 
 
using System.Collections;
using System.Diagnostics; 
using System.Windows.Media;
using System.Windows.Input;
using System.Windows.Documents;
using MS.Win32; 

using System; 
 
namespace System.Windows.Documents
{ 
    //-----------------------------------------------------
    //
    //  TextServicesDisplayAttribute class
    // 
    //-----------------------------------------------------
 
    ///  
    ///   The helper class to wrap TF_DISPLAYATTRIBUTE.
    ///  
    internal class TextServicesDisplayAttribute
    {
        //------------------------------------------------------
        // 
        //  Constructors
        // 
        //----------------------------------------------------- 

        internal TextServicesDisplayAttribute(UnsafeNativeMethods.TF_DISPLAYATTRIBUTE attr) 
        {
            _attr = attr;
        }
 
        //------------------------------------------------------
        // 
        //  Internal Method 
        //
        //------------------------------------------------------ 

        /// 
        ///   Check if this is empty.
        ///  
        internal bool IsEmptyAttribute()
        { 
            if (_attr.crText.type != UnsafeNativeMethods.TF_DA_COLORTYPE.TF_CT_NONE || 
                _attr.crBk.type != UnsafeNativeMethods.TF_DA_COLORTYPE.TF_CT_NONE ||
                _attr.crLine.type != UnsafeNativeMethods.TF_DA_COLORTYPE.TF_CT_NONE || 
                _attr.lsStyle != UnsafeNativeMethods.TF_DA_LINESTYLE.TF_LS_NONE)
                return false;

            return true; 
        }
 
        ///  
        ///   Apply the display attribute to to the given range.
        ///  
        internal void Apply(ITextPointer start, ITextPointer end)
        {
            //
            // 

 
 
#if NOT_YET
            if (_attr.crText.type != UnsafeNativeMethods.TF_DA_COLORTYPE.TF_CT_NONE) 
            {
            }

            if (_attr.crBk.type != UnsafeNativeMethods.TF_DA_COLORTYPE.TF_CT_NONE) 
            {
            } 
 
            if (_attr.lsStyle != UnsafeNativeMethods.TF_DA_LINESTYLE.TF_LS_NONE)
            { 
            }
#endif

        } 

        ///  
        ///   Convert TF_DA_COLOR to Color. 
        /// 
        internal static Color GetColor(UnsafeNativeMethods.TF_DA_COLOR dacolor) 
        {

            if (dacolor.type == UnsafeNativeMethods.TF_DA_COLORTYPE.TF_CT_SYSCOLOR)
            { 
                return GetSystemColor(dacolor.indexOrColorRef);
            } 
            else if (dacolor.type == UnsafeNativeMethods.TF_DA_COLORTYPE.TF_CT_COLORREF) 
            {
                int color = dacolor.indexOrColorRef; 
                uint argb = (uint)FromWin32Value(color);
                return Color.FromArgb((byte)((argb&0xff000000)>>24), (byte)((argb&0x00ff0000)>>16),(byte)((argb&0x0000ff00)>>8), (byte)(argb&0x000000ff));
            }
 
            return Color.FromArgb(0xff,0,0,0);
        } 
 
        /// 
        /// Line color of the composition line draw 
        /// 
        internal Color LineColor
        {
            get 
            {
                return GetColor(_attr.crLine); 
            } 
        }
 
        /// 
        /// Line style of the composition line draw
        /// 
        internal UnsafeNativeMethods.TF_DA_LINESTYLE LineStyle 
        {
            get 
            { 
                return _attr.lsStyle;
            } 
        }

        /// 
        /// Line bold of the composition line draw 
        /// 
        internal bool IsBoldLine 
        { 
            get
            { 
                return _attr.fBoldLine;
            }
        }
 
        /**
         * Shift count and bit mask for A, R, G, B components 
         */ 
        private const int AlphaShift  = 24;
        private const int RedShift    = 16; 
        private const int GreenShift  = 8;
        private const int BlueShift   = 0;

        private const int Win32RedShift    = 0; 
        private const int Win32GreenShift  = 8;
        private const int Win32BlueShift   = 16; 
 
        private static int Encode(int alpha, int red, int green, int blue)
        { 
            return red << RedShift | green << GreenShift | blue << BlueShift | alpha << AlphaShift;
        }

        private static int FromWin32Value(int value) 
        {
            return Encode(255, 
                (value >> Win32RedShift) & 0xFF, 
                (value >> Win32GreenShift) & 0xFF,
                (value >> Win32BlueShift) & 0xFF); 
        }

        /// 
        ///     Query for system colors. 
        /// 
        /// Same parameter as Win32's GetSysColor 
        /// The system color. 
        private static Color GetSystemColor(int index)
        { 
            uint argb;

            int color = SafeNativeMethods.GetSysColor(index);
 
            argb = (uint)FromWin32Value(color);
            return Color.FromArgb((byte)((argb&0xff000000)>>24), (byte)((argb&0x00ff0000)>>16),(byte)((argb&0x0000ff00)>>8), (byte)(argb&0x000000ff)); 
        } 

        //----------------------------------------------------- 
        //
        //  Private Field
        //
        //------------------------------------------------------ 

        private UnsafeNativeMethods.TF_DISPLAYATTRIBUTE _attr; 
    } 

} 

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