LineMetrics.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 / MS / Internal / Text / LineMetrics.cs / 1305600 / LineMetrics.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: LineMetrics.cs 
//
// Description: Cached metrics of a text line. 
// 
// History:
//  04/25/2003 : [....] - moving from Avalon branch. 
//
//---------------------------------------------------------------------------

using System; 
using System.Diagnostics;
using System.Windows; 
using System.Windows.Media; 
using System.Windows.Media.TextFormatting;
namespace MS.Internal.Text 
{
    // ---------------------------------------------------------------------
    // Storage for metrics of a formatted line.
    // --------------------------------------------------------------------- 
    internal struct LineMetrics
    { 
        // ------------------------------------------------------------------ 
        // Constructor.
        // 
        //      wrappingWidth - wrapping width for the line
        //      length - number or characters in the line
        //      width - width of the line
        //      height - height of the line 
        //      baseline - baseline of the line
        //      hasInlineObjects - has inline objects? 
        // ----------------------------------------------------------------- 
        internal LineMetrics(
#if DEBUG 
                    double wrappingWidth,
#endif
                    int length,
                    double width, 
                    double height,
                    double baseline, 
                    bool hasInlineObjects, 
                    TextLineBreak textLineBreak)
        { 
#if DEBUG
            _wrappingWidth = wrappingWidth;
#endif
            _start = 0; 
            _width  = width;
            _height = height; 
            _baseline = baseline; 
            _textLineBreak = textLineBreak;
 
            _packedData = ((uint) length & LengthMask) | (hasInlineObjects ? HasInlineObjectsMask : 0);
        }

        internal LineMetrics(LineMetrics source, double start, double width) 
        {
#if DEBUG 
            _wrappingWidth = source.WrappingWidth; 
#endif
            _start = start; 
            _width = width;

            _height = source.Height;
            _baseline = source.Baseline; 
            _textLineBreak = source.TextLineBreak;
 
            _packedData = source._packedData | HasBeenUpdatedMask; 
        }
 
        /// 
        /// Disposes linebreak object
        /// 
        internal LineMetrics Dispose(bool returnUpdatedMetrics) 
        {
            if(_textLineBreak != null) 
            { 
                _textLineBreak.Dispose();
                if (returnUpdatedMetrics) 
                {
                    return new LineMetrics(
#if DEBUG
                        _wrappingWidth, 
#endif
                        Length, 
                        _width, 
                        _height,
                        _baseline, 
                        HasInlineObjects,
                        null);
                }
            } 
            return this;
        } 
 

#if DEBUG 
        // ------------------------------------------------------------------
        // Wrapping width for the line.
        // ------------------------------------------------------------------
        internal double WrappingWidth { get { return _wrappingWidth; } } 
        private double _wrappingWidth;
#endif 
 
        // -----------------------------------------------------------------
        // Number or characters in the line. 
        // ------------------------------------------------------------------
        internal int Length { get { return (int) (_packedData & LengthMask); } }
        private uint _packedData;
 
        // -----------------------------------------------------------------
        // Width of the line. 
        // ----------------------------------------------------------------- 
        internal double Width
        { 
            get { Debug.Assert((_packedData & HasBeenUpdatedMask) != 0); return _width; }
        }
        private double _width;
 
        // -----------------------------------------------------------------
        // Height of the line. 
        // ------------------------------------------------------------------ 
        internal double Height { get { return _height; } }
        private double _height; 

        // -----------------------------------------------------------------
        // Start of the line. Distance from paragraph edge to line start.
        // ------------------------------------------------------------------ 
        internal double Start
        { 
            get { Debug.Assert((_packedData & HasBeenUpdatedMask) != 0); return _start; } 
        }
        private double _start; 

        // ------------------------------------------------------------------
        // Baseline offset of the line.
        // ----------------------------------------------------------------- 
        internal double Baseline { get { return _baseline; } }
        private double _baseline; 
 
        // ------------------------------------------------------------------
        // Has inline objects? 
        // -----------------------------------------------------------------
        internal bool HasInlineObjects { get { return (_packedData & HasInlineObjectsMask) != 0; } }

        // ----------------------------------------------------------------- 
        // Line break for formatting. (Line Break In)
        // ----------------------------------------------------------------- 
        internal TextLineBreak TextLineBreak { get { return _textLineBreak; } } 
        private TextLineBreak _textLineBreak;
 
        private static readonly uint HasBeenUpdatedMask = 0x40000000;
        private static readonly uint LengthMask = 0x3FFFFFFF;
        private static readonly uint HasInlineObjectsMask = 0x80000000;
    } 
}

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

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