FigureHelper.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PtsHost / FigureHelper.cs / 1305600 / FigureHelper.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: FigureHelper.cs 
//
// Description: Helpers for figure formatting 
// 
// History:
//  02/07/2006 : ghermann - created 
//
//---------------------------------------------------------------------------
#pragma warning disable 1634, 1691  // avoid generating warnings about unknown
                                    // message numbers and unknown pragmas for PRESharp contol 
using System;
using System.Windows; 
using System.Windows.Media; 
using System.Windows.Documents;
 
using MS.Internal.Text;

namespace MS.Internal.PtsHost
{ 

    // --------------------------------------------------------------------- 
    // Helper services to assist formatting figure 
    // ---------------------------------------------------------------------
    internal static class FigureHelper 
    {

        // ------------------------------------------------------------------
        // Returns whether a vertical anchor is relative to page 
        // -----------------------------------------------------------------
        internal static bool IsVerticalPageAnchor(FigureVerticalAnchor verticalAnchor) 
        { 
            return verticalAnchor == FigureVerticalAnchor.PageTop ||
                   verticalAnchor == FigureVerticalAnchor.PageBottom || 
                   verticalAnchor == FigureVerticalAnchor.PageCenter;
        }

        // ------------------------------------------------------------------ 
        // Returns whether a vertical anchor is relative to content
        // ------------------------------------------------------------------ 
        internal static bool IsVerticalContentAnchor(FigureVerticalAnchor verticalAnchor) 
        {
            return verticalAnchor == FigureVerticalAnchor.ContentTop || 
                   verticalAnchor == FigureVerticalAnchor.ContentBottom ||
                   verticalAnchor == FigureVerticalAnchor.ContentCenter;
        }
 

        // ----------------------------------------------------------------- 
        // Returns whether a horizontal anchor is relative to page 
        // ------------------------------------------------------------------
        internal static bool IsHorizontalPageAnchor(FigureHorizontalAnchor horizontalAnchor) 
        {
            return horizontalAnchor == FigureHorizontalAnchor.PageLeft  ||
                   horizontalAnchor == FigureHorizontalAnchor.PageRight ||
                   horizontalAnchor == FigureHorizontalAnchor.PageCenter; 
        }
 
        // ----------------------------------------------------------------- 
        // Returns whether a horizontal anchor is relative to content
        // ----------------------------------------------------------------- 
        internal static bool IsHorizontalContentAnchor(FigureHorizontalAnchor horizontalAnchor)
        {
            return horizontalAnchor == FigureHorizontalAnchor.ContentLeft  ||
                   horizontalAnchor == FigureHorizontalAnchor.ContentRight || 
                   horizontalAnchor == FigureHorizontalAnchor.ContentCenter;
        } 
 
        // -----------------------------------------------------------------
        // Returns whether a horizontal anchor is relative to column 
        // ------------------------------------------------------------------
        internal static bool IsHorizontalColumnAnchor(FigureHorizontalAnchor horizontalAnchor)
        {
            return horizontalAnchor == FigureHorizontalAnchor.ColumnLeft  || 
                   horizontalAnchor == FigureHorizontalAnchor.ColumnRight ||
                   horizontalAnchor == FigureHorizontalAnchor.ColumnCenter; 
        } 

        // ----------------------------------------------------------------- 
        // Width figure size calculation
        // ------------------------------------------------------------------
        internal static double CalculateFigureWidth(StructuralCache structuralCache, Figure figure, FigureLength figureLength, out bool isWidthAuto)
        { 
            double value;
 
            isWidthAuto = figureLength.IsAuto ? true : false; 

            // Check figure's horizontal anchor. If anchored to page, use page width to format 

            FigureHorizontalAnchor horizontalAnchor = figure.HorizontalAnchor;

            if(figureLength.IsPage || (figureLength.IsAuto && IsHorizontalPageAnchor(horizontalAnchor))) 
            {
                value = structuralCache.CurrentFormatContext.PageWidth * figureLength.Value; 
            } 
            else if (figureLength.IsAbsolute)
            { 
                value = CalculateFigureCommon(figureLength);
            }
            else // figureLength.IsColumn || figureLength.IsContent || figureLength.IsAuto
            { 
                double columnWidth, gap, rule;
                int cColumns; 
 
                GetColumnMetrics(structuralCache, out cColumns, out columnWidth, out gap, out rule);
 
                if (figureLength.IsContent || (figureLength.IsAuto && IsHorizontalContentAnchor(horizontalAnchor)))
                {
                    // Use content width for figure
                    value = (columnWidth * cColumns + gap * (cColumns - 1)) * figureLength.Value; 
                }
                else // figureLength.IsColumn || figureLength.IsAuto 
                { 
                    // We do this to prevent a 2.0 columns from spanning 2.0 + gap, so we just check for edge
                    double lengthValue = figureLength.Value; 

                    int columnGapsSpanned = (int) lengthValue;
                    if(columnGapsSpanned == lengthValue && columnGapsSpanned > 0)
                    { 
                        columnGapsSpanned -= 1;
                    } 
 
                    value = (columnWidth * lengthValue) + gap * columnGapsSpanned;
                } 
            }

            Invariant.Assert(!DoubleUtil.IsNaN(value));
 
            return value;
        } 
 
        // ------------------------------------------------------------------
        // Height figure size calculation 
        // -----------------------------------------------------------------
        internal static double CalculateFigureHeight(StructuralCache structuralCache, Figure figure, FigureLength figureLength, out bool isHeightAuto)
        {
            double value; 

            if(figureLength.IsPage) 
            { 
                value = (structuralCache.CurrentFormatContext.PageHeight) * figureLength.Value;
            } 
            else if(figureLength.IsContent) // Column to be treated same as content
            {
                Thickness pageMargin = structuralCache.CurrentFormatContext.PageMargin;
 
                value = (structuralCache.CurrentFormatContext.PageHeight - pageMargin.Top - pageMargin.Bottom) * figureLength.Value;
            } 
            else if (figureLength.IsColumn) 
            {
                // Height is calculated based on column width, since column height is the same as content. Per spec. 
                // Retrieve all column metrics for current page
                int cColumns;
                double columnWidth;
                double gap; 
                double rule;
                FigureHelper.GetColumnMetrics(structuralCache, out cColumns, out columnWidth, out gap, out rule); 
 
                // We do this to prevent a 2.0 columns from spanning 2.0 + gap, so we just check for edge
                double lengthValue = figureLength.Value; 
                if (lengthValue > cColumns)
                {
                    lengthValue = cColumns;
                } 
                int columnGapsSpanned = (int)lengthValue;
                if (columnGapsSpanned == lengthValue && columnGapsSpanned > 0) 
                { 
                    columnGapsSpanned -= 1;
                } 

                value = (columnWidth * lengthValue) + gap * columnGapsSpanned;
            }
            else 
            {
                value = FigureHelper.CalculateFigureCommon(figureLength); 
            } 

            if(!DoubleUtil.IsNaN(value)) 
            {
                FigureVerticalAnchor verticalAnchor = figure.VerticalAnchor;

                // Value is in pixels. Now we limit value to max out depending on anchoring. 
                if(FigureHelper.IsVerticalPageAnchor(verticalAnchor))
                { 
                    value = Math.Max(1, Math.Min(value, structuralCache.CurrentFormatContext.PageHeight)); 
                }
                else // Column and paragraph anchoring still max out at content height 
                {
                    Thickness pageMargin = structuralCache.CurrentFormatContext.PageMargin;
                    value = Math.Max(1, Math.Min(value, structuralCache.CurrentFormatContext.PageHeight - pageMargin.Top - pageMargin.Bottom));
                } 

                TextDpi.EnsureValidPageWidth(ref value); 
 
                isHeightAuto = false;
            } 
            else
            {
                value = structuralCache.CurrentFormatContext.PageHeight;
                isHeightAuto = true; 
            }
 
            return value; 
        }
 

        // ------------------------------------------------------------------
        // Common figure size calculation
        // ----------------------------------------------------------------- 
        internal static double CalculateFigureCommon(FigureLength figureLength)
        { 
            double value; 

            if(figureLength.IsAuto) 
            {
                value = Double.NaN;
            }
            else if(figureLength.IsAbsolute) 
            {
                value = figureLength.Value; 
            } 
            else
            { 
                Invariant.Assert(false, "Unknown figure length type specified.");
                value = 0.0;
            }
 
            return value;
        } 
 

        // ----------------------------------------------------------------- 
        // Returns calculated column information -  count, width, gap and rule.
        // -----------------------------------------------------------------
        internal static void GetColumnMetrics(StructuralCache structuralCache, out int cColumns, out double width, out double gap, out double rule)
        { 
            ColumnPropertiesGroup columnProperties = new ColumnPropertiesGroup(structuralCache.PropertyOwner);
            FontFamily pageFontFamily = (FontFamily)structuralCache.PropertyOwner.GetValue(Block.FontFamilyProperty); 
            double lineHeight = DynamicPropertyReader.GetLineHeightValue(structuralCache.PropertyOwner); 
            double pageFontSize = (double)structuralCache.PropertyOwner.GetValue(Block.FontSizeProperty);
            Size pageSize = structuralCache.CurrentFormatContext.PageSize; 
            Thickness pageMargin = structuralCache.CurrentFormatContext.PageMargin;
            double pageWidth = pageSize.Width - (pageMargin.Left + pageMargin.Right);

            cColumns = PtsHelper.CalculateColumnCount(columnProperties, lineHeight, pageWidth, pageFontSize, pageFontFamily, true); 

            double freeSpace; 
            rule = columnProperties.ColumnRuleWidth; 
            PtsHelper.GetColumnMetrics(columnProperties, pageWidth,
                                       pageFontSize, pageFontFamily, true, cColumns, 
                                       ref lineHeight, out width, out freeSpace, out gap);

            if (columnProperties.IsColumnWidthFlexible && columnProperties.ColumnSpaceDistribution == ColumnSpaceDistribution.Between)
            { 
                width += freeSpace / cColumns;
            } 
 
            width = Math.Min(width, pageWidth);
        } 
    }

}
 
#pragma warning enable 1634, 1691
 

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

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