MbpInfo.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PtsHost / MbpInfo.cs / 1305600 / MbpInfo.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: MbpInfo.cs 
//
// Description: Provides paragraph level margin collapsing support. 
// 
//---------------------------------------------------------------------------
 
using System;
using System.Windows;                       // DependencyObject
using System.Windows.Documents;             // Block
using MS.Internal.Text;                     // TextDpi 
using System.Windows.Media;                 // Brush
using MS.Internal.PtsHost.UnsafeNativeMethods;  // Pts 
 
namespace MS.Internal.PtsHost
{ 
    /// 
    /// Provides services for MBP handling.
    /// 
    internal sealed class MbpInfo 
    {
        ///  
        /// Get MbpInfo from DependencyObject. 
        /// 
        /// DependencyObject for which MBP properties are retrieved. 
        internal static MbpInfo FromElement(DependencyObject o)
        {
            if (o is Block || o is AnchoredBlock || o is TableCell || o is ListItem)
            { 
                MbpInfo mbp = new MbpInfo((TextElement)o);
                double lineHeight = DynamicPropertyReader.GetLineHeightValue(o); 
 
                if (mbp.IsMarginAuto)
                { 
                    ResolveAutoMargin(mbp, o, lineHeight);
                }
                if (mbp.IsPaddingAuto)
                { 
                    ResolveAutoPadding(mbp, o, lineHeight);
                } 
 
                return mbp;
            } 

            return _empty;
        }
 

        ///  
        /// Mirrors margin 
        /// 
        internal void MirrorMargin() 
        {
            ReverseFlowDirection(ref _margin);
        }
 
        /// 
        /// Mirrors border and padding 
        ///  
        internal void MirrorBP()
        { 
            ReverseFlowDirection(ref _border);
            ReverseFlowDirection(ref _padding);
        }
 
        /// 
        /// Reverses flow direction for a given thickness 
        ///  
        private static void ReverseFlowDirection(ref Thickness thickness)
        { 
            double temp = thickness.Left;
            thickness.Left = thickness.Right;
            thickness.Right = temp;
        } 

        ///  
        /// Static constructor. 
        /// 
        static MbpInfo() 
        {
            _empty = new MbpInfo();
        }
 
        /// 
        /// Private constructor. 
        ///  
        private MbpInfo()
        { 
            _margin = new Thickness();
            _border = new Thickness();
            _padding = new Thickness();
            _borderBrush = new SolidColorBrush(); 
        }
 
        ///  
        /// Constructor.
        ///  
        /// Block for which MBP properties are retrieved.
        private MbpInfo(TextElement block)
        {
            _margin  = (Thickness)block.GetValue(Block.MarginProperty); 
            _border  = (Thickness)block.GetValue(Block.BorderThicknessProperty);
            _padding = (Thickness)block.GetValue(Block.PaddingProperty); 
            _borderBrush = (Brush)block.GetValue(Block.BorderBrushProperty); 
        }
 
        /// 
        /// Resolve Auto values for Margin.
        /// 
        private static void ResolveAutoMargin(MbpInfo mbp, DependencyObject o, double lineHeight) 
        {
            Thickness defaultMargin; 
            if (o is Paragraph) 
            {
                DependencyObject parent = ((Paragraph)o).Parent; 
                if (parent is ListItem || parent is TableCell || parent is AnchoredBlock)
                {
                    defaultMargin = new Thickness(0);
                } 
                else
                { 
                    defaultMargin = new Thickness(0, lineHeight, 0, lineHeight); 
                }
            } 
            else if (o is Table || o is List)
            {
                defaultMargin = new Thickness(0, lineHeight, 0, lineHeight);
            } 
            else if (o is Figure || o is Floater)
            { 
                defaultMargin = new Thickness(0.5 * lineHeight); 
            }
            else 
            {
                defaultMargin = new Thickness(0);
            }
            mbp.Margin = new Thickness( 
                Double.IsNaN(mbp.Margin.Left) ? defaultMargin.Left : mbp.Margin.Left,
                Double.IsNaN(mbp.Margin.Top) ? defaultMargin.Top : mbp.Margin.Top, 
                Double.IsNaN(mbp.Margin.Right) ? defaultMargin.Right : mbp.Margin.Right, 
                Double.IsNaN(mbp.Margin.Bottom) ? defaultMargin.Bottom : mbp.Margin.Bottom);
        } 

        /// 
        /// Resolve Auto values for Padding.
        ///  
        private static void ResolveAutoPadding(MbpInfo mbp, DependencyObject o, double lineHeight)
        { 
            Thickness defaultPadding; 
            if (o is Figure || o is Floater)
            { 
                defaultPadding = new Thickness(0.5 * lineHeight);
            }
            else if (o is List)
            { 
                defaultPadding = ListMarkerSourceInfo.CalculatePadding((List)o, lineHeight);
            } 
            else 
            {
                defaultPadding = new Thickness(0); 
            }
            mbp.Padding = new Thickness(
                Double.IsNaN(mbp.Padding.Left) ? defaultPadding.Left : mbp.Padding.Left,
                Double.IsNaN(mbp.Padding.Top) ? defaultPadding.Top : mbp.Padding.Top, 
                Double.IsNaN(mbp.Padding.Right) ? defaultPadding.Right : mbp.Padding.Right,
                Double.IsNaN(mbp.Padding.Bottom) ? defaultPadding.Bottom : mbp.Padding.Bottom); 
        } 

        ///  
        /// Combined value of left Margin, Border and Padding.
        /// 
        internal int MBPLeft
        { 
            get { return TextDpi.ToTextDpi(_margin.Left) + TextDpi.ToTextDpi(_border.Left) + TextDpi.ToTextDpi(_padding.Left); }
        } 
 
        /// 
        /// Combined value of right Margin, Border and Padding. 
        /// 
        internal int MBPRight
        {
            get { return TextDpi.ToTextDpi(_margin.Right) + TextDpi.ToTextDpi(_border.Right) + TextDpi.ToTextDpi(_padding.Right); } 
        }
 
        ///  
        /// Combined value of top Margin, Border and Padding.
        ///  
        internal int MBPTop
        {
            get { return TextDpi.ToTextDpi(_margin.Top) + TextDpi.ToTextDpi(_border.Top) + TextDpi.ToTextDpi(_padding.Top); }
        } 

        ///  
        /// Combined value of top Margin, Border and Padding. 
        /// 
        internal int MBPBottom 
        {
            get { return TextDpi.ToTextDpi(_margin.Bottom) + TextDpi.ToTextDpi(_border.Bottom) + TextDpi.ToTextDpi(_padding.Bottom); }
        }
 
        /// 
        /// Combined value of left Border and Padding. 
        ///  
        internal int BPLeft
        { 
            get { return TextDpi.ToTextDpi(_border.Left) + TextDpi.ToTextDpi(_padding.Left); }
        }

        ///  
        /// Combined value of right Border and Padding.
        ///  
        internal int BPRight 
        {
            get { return TextDpi.ToTextDpi(_border.Right) + TextDpi.ToTextDpi(_padding.Right); } 
        }

        /// 
        /// Combined value of top Border and Padding. 
        /// 
        internal int BPTop 
        { 
            get { return TextDpi.ToTextDpi(_border.Top) + TextDpi.ToTextDpi(_padding.Top); }
        } 

        /// 
        /// Combined value of bottom Border and Padding.
        ///  
        internal int BPBottom
        { 
            get { return TextDpi.ToTextDpi(_border.Bottom) + TextDpi.ToTextDpi(_padding.Bottom); } 
        }
 
        /// 
        /// Left Border
        /// 
        internal int BorderLeft 
        {
            get { return TextDpi.ToTextDpi(_border.Left); } 
        } 

        ///  
        /// Right Border
        /// 
        internal int BorderRight
        { 
            get { return TextDpi.ToTextDpi(_border.Right); }
        } 
 
        /// 
        /// Top Border 
        /// 
        internal int BorderTop
        {
            get { return TextDpi.ToTextDpi(_border.Top); } 
        }
 
        ///  
        /// Bottom Border
        ///  
        internal int BorderBottom
        {
            get { return TextDpi.ToTextDpi(_border.Bottom); }
        } 

        ///  
        /// Left margin. 
        /// 
        internal int MarginLeft 
        {
            get { return TextDpi.ToTextDpi(_margin.Left); }
        }
 
        /// 
        /// Right margin. 
        ///  
        internal int MarginRight
        { 
            get { return TextDpi.ToTextDpi(_margin.Right); }
        }

        ///  
        /// top  margin.
        ///  
        internal int MarginTop 
        {
            get { return TextDpi.ToTextDpi(_margin.Top); } 
        }

        /// 
        /// Bottom margin. 
        /// 
        internal int MarginBottom 
        { 
            get { return TextDpi.ToTextDpi(_margin.Bottom); }
        } 

        /// 
        /// Margin thickness.
        ///  
        internal Thickness Margin
        { 
            get { return _margin; } 
            set { _margin = value; }
        } 

        /// 
        /// Border thickness.
        ///  
        internal Thickness Border
        { 
            get { return _border; } 
            set { _border = value; }
        } 

        internal Thickness Padding
        {
            get { return _padding; } 
            set { _padding = value; }
        } 
 
        /// 
        /// Border brush. 
        /// 
        internal Brush BorderBrush
        {
            get { return _borderBrush; } 
        }
 
        ///  
        /// Whether any padding value is Auto.
        ///  
        private bool IsPaddingAuto
        {
            get
            { 
                return (
                    Double.IsNaN(_padding.Left) || 
                    Double.IsNaN(_padding.Right) || 
                    Double.IsNaN(_padding.Top) ||
                    Double.IsNaN(_padding.Bottom)); 
            }
        }

        ///  
        /// Whether any margin value is Auto.
        ///  
        private bool IsMarginAuto 
        {
            get 
            {
                return (
                    Double.IsNaN(_margin.Left) ||
                    Double.IsNaN(_margin.Right) || 
                    Double.IsNaN(_margin.Top) ||
                    Double.IsNaN(_margin.Bottom)); 
            } 
        }
 
        /// 
        /// Margin thickness.
        /// 
        private Thickness _margin; 

        ///  
        /// Border thickness. 
        /// 
        private Thickness _border; 

        /// 
        /// Padding thickness.
        ///  
        private Thickness _padding;
 
        ///  
        /// Border brush.
        ///  
        private Brush _borderBrush;

        /// 
        /// Empty MBPInfo instance. 
        /// 
        private static MbpInfo _empty; 
    } 
}
 

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

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