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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// Description:
// FixedTextBuilder contains heuristics to map fixed document elements
// into stream of flow text
//
namespace System.Windows.Documents
{
using MS.Internal.Documents;
using System.Windows.Controls; // UIElementCollection
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Markup;
using System.Windows.Shapes; // Glyphs
using System.Windows.Automation;
using System.Windows.Documents.DocumentStructures;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Text;
using System.IO;
using System.Xml;
using Path=System.Windows.Shapes.Path;
using MS.Utility;
//=====================================================================
/// <summary>
/// FixedTextBuilder contains heuristics to map fixed document elements
/// into stream of flow text.
/// </summary>
internal sealed class FixedTextBuilder
{
//--------------------------------------------------------------------
//
// Consts
//
//---------------------------------------------------------------------
#region Const
internal const char FLOWORDER_SEPARATOR = ' ';
#endregion Const
//--------------------------------------------------------------------
//
// Statics
//
//---------------------------------------------------------------------
#region Statics
// A list of CultureInfo that are always adjacent
internal static CultureInfo[] AdjacentLanguage =
{
new CultureInfo("zh-HANS"), // Chinese Simplified
new CultureInfo("zh-HANT"), // Chinese Traditional
new CultureInfo("zh-HK"), // Chinese Hong Kong SAR
new CultureInfo("zh-MO"), // Chinese Macao SAR
new CultureInfo("zh-CN"), // Chinese China
new CultureInfo("zh-SG"), // Chinese Singapore
new CultureInfo("zh-TW"), // Chinese `Taiwan
new CultureInfo("ja-JP"), // Japanese
new CultureInfo("ko-KR"), // Korean
new CultureInfo("th-TH") // Thai
};
internal static bool AlwaysAdjacent(CultureInfo ci)
{
foreach (CultureInfo cultureInfo in AdjacentLanguage)
{
if (ci.Equals(cultureInfo))
{
return true;
}
}
return false;
}
// obtained via Unicode 3.0 book: C0 Controls and Basic Latin.
// 0x002D/0x00AD and their related characters.
//
// NOTE it is okay to not getting accurate list as long as
// we deal with common cases since this is used in heuristic
// algorithm!
internal static ReadOnlySpan<char> HyphenSet =>
[
'\x002D', // Hyphen-Minus
'\x2010', // Hyphen
'\x2011', // Non-breaking Hyphen
'\x2012', // Figure-dash
'\x2013', // En-dash
'\x2212', // Minus Sign
'\x00AD' // Soft-Hyphen
];
internal static bool IsHyphen(char target) => HyphenSet.Contains(target);
// Space that was used in the heuristic algorithm.
internal static bool IsSpace(char target)
{
// Only the regular space character is considered
// space.
return (target == '\x0020');
}
#endregion Statics
//--------------------------------------------------------------------
//
// Connstructors
//
//---------------------------------------------------------------------
#region Constructors
internal FixedTextBuilder(FixedTextContainer container)
{
_container = container;
_Init();
}
#endregion Constructors
//--------------------------------------------------------------------
//
// Public Methods
//
//---------------------------------------------------------------------
//--------------------------------------------------------------------
//
// Public Properties
//
//---------------------------------------------------------------------
//--------------------------------------------------------------------
//
// Public Events
//
//---------------------------------------------------------------------
//--------------------------------------------------------------------
//
// Internal Methods
//
//---------------------------------------------------------------------
#region Internal Methods
//--------------------------------------------------------------------
// Virtualization
//---------------------------------------------------------------------
// Add virtual FlowNode to represent the page
internal void AddVirtualPage()
{
#if DEBUG
DocumentsTrace.FixedTextOM.Builder.Trace($"AppendVirtualPage {_pageStructures.Count}");
#endif
FixedPageStructure pageStructure = new FixedPageStructure(_pageStructures.Count);
#if DEBUG
pageStructure.FixedTextBuilder = this;
#endif
_pageStructures.Add(pageStructure);
// Insert the virtural FlowNode into the Flow Order.
_fixedFlowMap.FlowOrderInsertBefore(_fixedFlowMap.FlowEndEdge, pageStructure.FlowStart);
}
//--------------------------------------------------------------------
// Devirtualizing flow structure
//---------------------------------------------------------------------
// Making sure a page is devirtualized
// All function that takes FixedNode as parameter and asks for FlowPosition
// related content should call this functions first!!!
internal bool EnsureTextOMForPage(int pageIndex)
{
Debug.Assert(!_IsBoundaryPage(pageIndex));
FixedPageStructure pageStructure = _pageStructures[pageIndex];
if (!pageStructure.Loaded)
{
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordXPS, EventTrace.Event.WClientDRXEnsureOMBegin);
try
{
FixedPage page = _container.FixedDocument.SyncGetPage(pageIndex, false);
if (page == null)
return false;
Size pageSize = _container.FixedDocument.ComputePageSize(page);
page.Measure(pageSize);
page.Arrange(new Rect(new Point(0, 0), pageSize));
Debug.Assert(page != null);
Debug.Assert(page.IsInitialized);
bool constructSOM = true;
StoryFragments sf = page.GetPageStructure();
if (sf != null)
{
constructSOM = false;
FixedDSBuilder fb = new FixedDSBuilder(page, sf);
pageStructure.FixedDSBuilder = fb;
}
if (constructSOM)
{
FixedSOMPageConstructor pageConstructor = new FixedSOMPageConstructor(page, pageIndex);
pageStructure.PageConstructor = pageConstructor;
pageStructure.FixedSOMPage = pageConstructor.FixedSOMPage;
}
DocumentsTrace.FixedTextOM.Builder.Trace("_EnsureTextOMForPage Loading...");
_CreateFixedMappingAndElementForPage(pageStructure, page, constructSOM);
#if DEBUG
//
// Note: this debug verification is expensive. I have moved this code from FixedFlowMap.cs
// to reduce the rate is is called. Now it is called after each page is constructed and might
// still have effect on long documents and scrolling in page per stream case.
//
//FixedFlowMap.DebugVerifyMapping(true);
#endif
}
finally
{
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordXPS, EventTrace.Event.WClientDRXEnsureOMEnd);
}
return true;
}
#if DEBUG
FixedPage fixedPage = _container.FixedDocument.SyncGetPage(pageIndex, false);
fixedPage.FixedPageStructure = pageStructure;
#endif
return false;
}
//--------------------------------------------------------------------
// Fixed Document
//---------------------------------------------------------------------
// This could return null if FixedNode is an artificial boundary node
internal FixedPage GetFixedPage(FixedNode node)
{
FixedDocument doc = _container.FixedDocument;
return doc.SyncGetPageWithCheck(node.Page);
}
// This could return null if FixedNode is an artificial boundary node
internal Glyphs GetGlyphsElement(FixedNode node)
{
FixedPage page = GetFixedPage(node);
if (page != null)
{
return page.GetGlyphsElement(node);
}
return null;
}
//--------------------------------------------------------------------
// Hit Testing / Keyboard Navigation
//---------------------------------------------------------------------
// Given a fixed node, find its next/previous line
// count:
// in # of lines desired
// out # of lines remaining
// Return null if no next line
internal FixedNode[] GetNextLine(FixedNode currentNode, bool forward, ref int count)
{
if (_IsBoundaryPage(currentNode.Page))
{
return null;
}
EnsureTextOMForPage(currentNode.Page);
FixedPageStructure ps = _pageStructures[currentNode.Page];
if (_IsStartVisual(currentNode[1]))
{
FixedNode[] firstLine = ps.FirstLine;
if (firstLine == null)
{
return null;
}
currentNode = firstLine[0];
count--;
}
else if (_IsEndVisual(currentNode[1]))
{
FixedNode[] lastLine = ps.LastLine;
if (lastLine == null)
{
return null;
}
currentNode = lastLine[0];
count--;
}
FixedSOMTextRun run = _fixedFlowMap.MappingGetFixedSOMElement(currentNode, 0) as FixedSOMTextRun;
if (run == null)
{
return null;
}
int lineIndex = run.LineIndex;
return ps.GetNextLine(lineIndex, forward, ref count);
}
// Given a fixed node
// Return null is cannot get line
internal FixedNode[] GetLine(int pageIndex, Point pt)
{
EnsureTextOMForPage(pageIndex);
return _pageStructures[pageIndex].FindSnapToLine(pt);
}
// Find first line on page
internal FixedNode[] GetFirstLine(int pageIndex)
{
EnsureTextOMForPage(pageIndex);
return _pageStructures[pageIndex].FirstLine;
}
//-----------------------------------------------
// Fixed nodes ==> FlowPosition
//-----------------------------------------------
// Find out flow offset given fixed position
internal FlowPosition CreateFlowPosition(FixedPosition fixedPosition)
{
// make sure page has been loaded
EnsureTextOMForPage(fixedPosition.Page);
FixedSOMElement element = _fixedFlowMap.MappingGetFixedSOMElement(fixedPosition.Node, fixedPosition.Offset);
if (element != null)
{
FlowNode flow = element.FlowNode;
int fixedOffset = fixedPosition.Offset;
FixedSOMTextRun run = element as FixedSOMTextRun;
if (run != null && run.IsReversed)
{
fixedOffset = run.EndIndex - run.StartIndex - fixedOffset;
}
int offset = element.OffsetInFlowNode + fixedOffset - element.StartIndex;
return new FlowPosition(_container, flow, offset);
}
return null;
}
internal FlowPosition GetPageStartFlowPosition(int pageIndex)
{
EnsureTextOMForPage(pageIndex);
FlowNode fn = _pageStructures[pageIndex].FlowStart;
// Remove this assert once we start supporting element across page bounary
Debug.Assert(fn.Type == FlowNodeType.Start);
return new FlowPosition(_container, fn, 0);
}
internal FlowPosition GetPageEndFlowPosition(int pageIndex)
{
EnsureTextOMForPage(pageIndex);
// Remove this assert once we start supporting element across page bounary
FlowNode fn = _pageStructures[pageIndex].FlowEnd;
return new FlowPosition(_container, fn, 1);
}
//-----------------------------------------------
// FlowPosition ==> Fixed Nodes
//-----------------------------------------------
// This function can handle flow nodes that are mapped to fixed nodes (Object or Run type) and start and end nodes
internal bool GetFixedPosition(FlowPosition position, LogicalDirection textdir, out FixedPosition fixedp)
{
// Currently broken on empty page and on start/end flow nodes!
// Init out parameter
fixedp = new FixedPosition(FixedFlowMap.FixedStartEdge, 0);
int flowOffset;
FlowNode flow;
position.GetFlowNode(textdir, out flow, out flowOffset);
FixedSOMElement[] fixes = flow.FixedSOMElements;
if (fixes == null)
{
return false;
}
int loIndex = 0, hiIndex = fixes.Length - 1;
while (hiIndex > loIndex)
{
int index = (hiIndex + loIndex + 1) >> 1; // middle, round up -- guarantee hiIndex >= index > loIndex
if (fixes[index].OffsetInFlowNode > flowOffset)
{
hiIndex = index - 1;
}
else
{
loIndex = index;
}
}
FixedSOMElement element = fixes[loIndex];
FixedSOMTextRun run;
if (loIndex > 0 &&
textdir == LogicalDirection.Backward &&
element.OffsetInFlowNode == flowOffset)
{
//check if we should really be in the prior element
FixedSOMElement last = fixes[loIndex - 1];
int offsetInLast = flowOffset - last.OffsetInFlowNode + last.StartIndex;
if (offsetInLast == last.EndIndex)
{
run = last as FixedSOMTextRun;
if (run != null && run.IsReversed)
{
offsetInLast = run.EndIndex - run.StartIndex - offsetInLast;
}
fixedp = new FixedPosition(last.FixedNode, offsetInLast);
return true;
}
}
run = element as FixedSOMTextRun;
int fixedOffset = flowOffset - element.OffsetInFlowNode + element.StartIndex;
if (run != null && run.IsReversed)
{
fixedOffset = run.EndIndex - run.StartIndex - fixedOffset;
}
fixedp = new FixedPosition(element.FixedNode, fixedOffset);
return true;
}
// Find out fixed node given flow positions
internal bool GetFixedNodesForFlowRange(FlowPosition pStart,
FlowPosition pEnd,
out FixedSOMElement[] somElements,
out int firstElementStart,
out int lastElementEnd)
{
Debug.Assert(pStart.CompareTo(pEnd) < 0);
somElements = null;
firstElementStart = 0;
lastElementEnd = 0;
FlowNode[] flowNodes;
int charStart = 0;
int charEnd = -1;
int offsetStart;
int offsetEnd;
pStart.GetFlowNodes(pEnd, out flowNodes, out offsetStart, out offsetEnd);
if (flowNodes.Length <= 0)
{
return false;
}
ArrayList ar = new ArrayList();
FlowNode flowStart = flowNodes[0];
FlowNode flowEnd = flowNodes[flowNodes.Length - 1];
foreach (FlowNode flowScan in flowNodes)
{
int skipBefore = 0;
int stopAt = Int32.MaxValue;
if (flowScan == flowStart)
{
skipBefore = offsetStart;
}
if (flowScan == flowEnd)
{
stopAt = offsetEnd;
}
if (flowScan.Type == FlowNodeType.Object)
{
FixedSOMElement[] fixes = flowScan.FixedSOMElements;
Debug.Assert(fixes.Length == 1);
ar.Add(fixes[0]);
}
if (flowScan.Type == FlowNodeType.Run)
{
FixedSOMElement[] fixes = flowScan.FixedSOMElements;
foreach (FixedSOMElement element in fixes)
{
int startIndex = element.OffsetInFlowNode;
if (startIndex >= stopAt)
{
break;
}
int endIndex = startIndex + element.EndIndex - element.StartIndex;
if (endIndex <= skipBefore)
{
continue;
}
ar.Add(element);
if (skipBefore >= startIndex && flowScan == flowStart)
{
charStart = element.StartIndex + skipBefore - startIndex;
}
if (stopAt <= endIndex && flowScan == flowEnd)
{
charEnd = element.StartIndex + stopAt - startIndex;
break;
}
else if (stopAt == endIndex + 1)
{
charEnd = element.EndIndex; //in case this ends at beginning of next node
}
}
}//endofifrun
}//endofforeach FlowNode
// This array could be empty! (Maybe...) Broken if it is.
somElements = (FixedSOMElement[])ar.ToArray(typeof(FixedSOMElement));
if (somElements.Length == 0)
{
return false;
}
if (flowStart.Type == FlowNodeType.Object)
{ // Image
firstElementStart = offsetStart;
}
else
{
firstElementStart = charStart;
}
if (flowEnd.Type == FlowNodeType.Object)
{
lastElementEnd = offsetEnd;
}
else
{
lastElementEnd = charEnd;
}
return true;
}
//-----------------------------------------------
// FlowPosition ==> Flow Content
//-----------------------------------------------
// Helper function to retrieve text from FixedNodes that are mapped
// to a flow run represented by a FlowPosition.
internal string GetFlowText(FlowNode flowNode)
{
Debug.Assert(flowNode.Type == FlowNodeType.Run);
StringBuilder sb = new StringBuilder();
FixedSOMElement[] fixes = flowNode.FixedSOMElements;
Debug.Assert(flowNode.Type == FlowNodeType.Run);
Debug.Assert(fixes != null);
foreach (FixedSOMTextRun element in fixes)
{
sb.Append(element.Text);
}
return sb.ToString();
}
internal static bool MostlyRTL(string s)
{
int RTL = 0;
int LTR = 0;
foreach (char c in s)
{
if (_IsRTL(c))
{
RTL++;
}
else if (c != ' ')
{
LTR++;
}
}
return (RTL > 0) && (LTR == 0 || (RTL / LTR >= 2));
}
//Decides whether two lines specified by line heights and a vertical distance between them is considered on the same line
//verticalDistance needs to be passed as top of line2 - top of line 1
internal static bool IsSameLine(double verticalDistance, double fontSize1, double fontSize2)
{
// According to spec for rubber band selection, to adjacent Glyphs are on same line if they have 50% overlap
double smallSize = (fontSize1 < fontSize2) ? fontSize1 : fontSize2;
double overlap = (verticalDistance > 0) ? (fontSize1 - verticalDistance) : (fontSize2 + verticalDistance);
return overlap / smallSize > .5;
}
//------------------------------------------------------------------------------
// Design Note (ZhenbinX - 2004/11/15) - Heuristic to test if two FixedSOMTextRun adjacent
// in geometry for the purpose of adding additional separator into non-adjacent runs.
// This algorithm bias toward NOT adding separator. The reason is artifically breaking
// a word is more annoying than missing a space between words.
//
// The following steps are applied in order:
// 1. If the two TextRun belong to two different languages, they are not
// adjacent. (A separator is needed)
// 2. If the TextRun belongs to a language that does not use space as separator,
// they are always adjacent. (Need additional input about Bidi and complext
// script here. Currently NOT adjacent).
// 3. If the two TextRuns belong to two different lines, they are NOT adjacent
// unless the end of the previous GlyphRun is HYPHEN.
// 3. For TextRuns on the same line:
// a. If the last character of the previous run is SPACE, they are adjacent.
// b. If they are in different Bidi embedding level, they are NOT adjacent.
// c. If the distance between their InkBoundingBox is greater than 1/4 of
// the BoundingBox of the preceeding GlyphRun, they are NOT adjacent.
// (This can be tweaked to use step function in the future!).
// All others are adjacent Glyphs!
//
//------------------------------------------------------------------------------
internal static bool IsNonContiguous(CultureInfo ciPrev,
CultureInfo ciCurrent,
bool isSidewaysPrev,
bool isSidewaysCurrent,
string strPrev,
string strCurrent,
GlyphComparison comparison)
{
if (ciPrev != ciCurrent)
{
return true;
}
if (AlwaysAdjacent(ciPrev))
{
return false;
}
if (isSidewaysPrev != isSidewaysCurrent)
{
return true; // not adjacent
}
if (strPrev.Length == 0 || strCurrent.Length == 0)
{
return false; // adjacent
}
if (!isSidewaysPrev)
{ // Horizontal Lines
int textLength = strPrev.Length;
char lastChar = strPrev[textLength - 1];
if (IsSpace(lastChar))
{
return false; // adjacent
}
if (comparison == GlyphComparison.DifferentLine ||
comparison == GlyphComparison.Unknown)
{
// Different Line
if (!IsHyphen(lastChar))
{
return true; // non adjacent
}
}
else
{
return comparison != GlyphComparison.Adjacent;
}
}
return false; // Default is adjacent
}
#endregion Internal Methods
//--------------------------------------------------------------------
//
// Internal Properties
//
//---------------------------------------------------------------------
#region Internal Properties
internal FixedFlowMap FixedFlowMap
{
get
{
return _fixedFlowMap;
}
}
#if DEBUG
internal FixedTextContainer FixedTextContainer
{
get
{
return _container;
}
}
#endif
#endregion Internal Propeties
//--------------------------------------------------------------------
//
// Private Methods
//
//---------------------------------------------------------------------
#region Private Methods
//--------------------------------------------------------------------
// Initilization
//---------------------------------------------------------------------
private void _Init()
{
// Initialize Id
_nextScopeId = FixedFlowMap.FlowOrderScopeIdStart;
// Create empty mapping
_fixedFlowMap = new FixedFlowMap();
//
_pageStructures = new List<FixedPageStructure>();
}
//--------------------------------------------------------------------
// Heuristics
//
// Design Note (ZhenbinX):
// Page boundary is artificially represented by a pair
// of FixedNodes. Start of Page uses int.MinValue as
// its glyphs index, while End of Page uses int.MaxValue
// as its glyphs index. All users of FixedNode needs
// to be aware of such articifical index and special case
// so that the "fake" glyphs indice are not used to access
// children. One should always use FixedPage.GetGlyphs
// instead of using FixedPage's logical children collection
// directly, and should always check for possible null return.
//
// The page boundaries, however, are mapped to a FlowNodeType.Run
// instead of any other FlowNodeType. This is to be
// consistent with the general principal that non-run type
// FlowNode has no corresponding FixedNode.
//
// Each FlowNode, if it is of type FlowNodeType.Run, contains
// a cookie that is the run length.
//---------------------------------------------------------------------
// Helper function for efficient creation of FixedNode used during pre-order walking.
// current index is @ childIndex
// depending on nesting level, the prefix can be hold at
// 1. no prefix (level1)
// 2. level1Index
// 3. pathPrefix.
//
FixedNode _NewFixedNode(int pageIndex, int nestingLevel, int level1Index, int[] pathPrefix, int childIndex)
{
if (nestingLevel == 1)
{
return FixedNode.Create(pageIndex, nestingLevel, childIndex, -1, null);
}
else if (nestingLevel == 2)
{
return FixedNode.Create(pageIndex, nestingLevel, level1Index, childIndex, null);
}
else
{
// For deeply nested path, we need to append current childIndex to a pathPrefix
// to form the entire childPath.
Debug.Assert(pathPrefix != null);
int[] newPath = new int[pathPrefix.Length + 1];
pathPrefix.CopyTo(newPath, 0);
newPath[newPath.Length - 1] = childIndex;
return FixedNode.Create(pageIndex, nestingLevel, -1, -1, newPath);
}
}
// Helper function to get Paths with ImageBrushes
private bool _IsImage(object o)
{
System.Windows.Shapes.Path p = o as System.Windows.Shapes.Path;
if (p != null)
{
return p.Fill is ImageBrush && p.Data != null;
}
return o is Image;
}
private bool _IsNonContiguous(FixedSOMTextRun prevRun, FixedSOMTextRun currentRun, GlyphComparison comparison)
{
Debug.Assert(prevRun != null);
Debug.Assert(currentRun != null);
if (prevRun.FixedNode == currentRun.FixedNode)
{
return currentRun.StartIndex != prevRun.EndIndex;
}
return IsNonContiguous(prevRun.CultureInfo,
currentRun.CultureInfo,
prevRun.IsSideways,
currentRun.IsSideways,
prevRun.Text,
currentRun.Text,
comparison);
}
private GlyphComparison _CompareGlyphs(Glyphs glyph1, Glyphs glyph2)
{
GlyphComparison comparison = GlyphComparison.DifferentLine;
if (glyph1 == glyph2)
{
comparison = GlyphComparison.SameLine;
}
else if (glyph1 != null && glyph2 != null)
{
GlyphRun run1 = glyph1.ToGlyphRun();
GlyphRun run2 = glyph2.ToGlyphRun();
if (run1 != null && run2 != null)
{
Rect box1 = run1.ComputeAlignmentBox();
box1.Offset(glyph1.OriginX, glyph1.OriginY);
Rect box2 = run2.ComputeAlignmentBox();
box2.Offset(glyph2.OriginX, glyph2.OriginY);
bool LTR1 = ((glyph1.BidiLevel & 1) == 0);
bool LTR2 = ((glyph2.BidiLevel & 1) == 0);
GeneralTransform transform = glyph2.TransformToVisual(glyph1);
Point prevPt = LTR1 ? box1.TopRight : box1.TopLeft;
Point currentPt = LTR2 ? box2.TopLeft : box2.TopRight;
if (transform != null)
{
transform.TryTransform(currentPt, out currentPt);
}
if (IsSameLine(currentPt.Y - prevPt.Y, box1.Height, box2.Height))
{
comparison = GlyphComparison.SameLine;
if (LTR1 == LTR2)
{
double xDistance = Math.Abs(currentPt.X - prevPt.X);
double maxHeight = Math.Max(box1.Height, box2.Height);
if (xDistance / maxHeight < .05)
{
comparison = GlyphComparison.Adjacent;
}
}
}
}
}
return comparison;
}
// Apply heuristics
// Create FlowNode structure
// Create Fixed to Flow mapping
// Create FixedElement
private void _CreateFixedMappingAndElementForPage(FixedPageStructure pageStructure, FixedPage page, bool constructSOM)
{
List<FixedNode> fixedNodes = new List<FixedNode>();
_GetFixedNodes(pageStructure,
page.Children,
1,
-1,
null,
constructSOM,
fixedNodes,
Matrix.Identity);
FlowModelBuilder flowBuilder = new FlowModelBuilder(this, pageStructure, page);
flowBuilder.FindHyperlinkPaths(page);
if (constructSOM)
{
pageStructure.FixedSOMPage.MarkupOrder = fixedNodes;
pageStructure.ConstructFixedSOMPage(fixedNodes);
_CreateFlowNodes(pageStructure.FixedSOMPage, flowBuilder);
pageStructure.PageConstructor = null;
}
else
{
pageStructure.FixedDSBuilder.ConstructFlowNodes(flowBuilder, fixedNodes);
}
flowBuilder.FinishMapping();
#if DEBUG
pageStructure.FixedNodes = fixedNodes;
//flowBuilder.DumpToFile("FlowDump_Page_" + pageStructure.PageIndex.ToString() + ".xml");
#endif
}
private void _GetFixedNodes(
FixedPageStructure pageStructure,
IEnumerable oneLevel,
int nestingLevel, // the level of nesting
int level1Index, // if nesting level == 2, this is leve1 1 index
int[] pathPrefix, // if nesting level > 2, this is used to represent prefix, otherwise it is null
bool constructLines,
List<FixedNode> fixedNodes, // start empty, nodes will be added to this list
Matrix transform
)
{
int pageIndex = pageStructure.PageIndex;
DocumentsTrace.FixedTextOM.Builder.Trace($"_FlowOrderAnalysis P{pageIndex}-L[{pageIndex}]");
int currentScopeId = _NewScopeId();
// Create per run fixed nodes
IFrameworkInputElement namedNode;
int childIndex = 0;
IEnumerator elements = oneLevel.GetEnumerator();
while (elements.MoveNext())
{
if (!constructLines)
{
namedNode = elements.Current as IFrameworkInputElement;
if (namedNode != null && namedNode.Name != null && namedNode.Name.Length != 0)
{
pageStructure.FixedDSBuilder.BuildNameHashTable(namedNode.Name,
elements.Current as UIElement,
fixedNodes.Count);
}
}
if (_IsImage(elements.Current) ||
(elements.Current is Glyphs && (elements.Current as Glyphs).MeasurementGlyphRun != null))
{
fixedNodes.Add(
_NewFixedNode(pageIndex, nestingLevel, level1Index, pathPrefix, childIndex)
);
// GlyphRuns are non contiguous due to Image
}
else if (constructLines && elements.Current is Path)
{
pageStructure.PageConstructor.ProcessPath(elements.Current as Path, transform);
}
else if (elements.Current is Canvas)
{
Transform localTransform = Transform.Identity;
// Drill down to next level
IEnumerable children;
Canvas canvas = elements.Current as Canvas;
children = canvas.Children;
localTransform = canvas.RenderTransform;
if (localTransform == null)
{
localTransform = Transform.Identity;
}
if (children != null)
{
int[] newPathPrefix = null;
if (nestingLevel >= 2)
{
// anything more than two level deep, we need to use path array
if (nestingLevel == 2)
{
Debug.Assert(pathPrefix == null);
Debug.Assert(level1Index >= 0);
newPathPrefix = new int[2];
newPathPrefix[0] = level1Index;
}
else
{
newPathPrefix = new int[pathPrefix.Length + 1];
pathPrefix.CopyTo(newPathPrefix, 0);
}
// Append the childIndex to newPathPrefix.
Debug.Assert(newPathPrefix != null);
newPathPrefix[newPathPrefix.Length - 1] = childIndex;
}
#if DEBUG
else
{
Debug.Assert(pathPrefix == null && newPathPrefix == null);
}
#endif
_GetFixedNodes(
pageStructure,
children,
(nestingLevel + 1), // go to next nesting level
(nestingLevel == 1 ? childIndex : -1), // use this index if we are going from 1 to 2
newPathPrefix, // otherwise use this path prefix
constructLines,
fixedNodes,
localTransform.Value * transform
);
}//endofElementIsCanvas
}
childIndex++;
}
}
private void _CreateFlowNodes(FixedSOMPage somPage, FlowModelBuilder flowBuilder)
{
flowBuilder.AddStartNode(FixedElement.ElementType.Section);
somPage.SetRTFProperties(flowBuilder.FixedElement);
foreach (FixedSOMContainer container in somPage.SemanticBoxes)
{
_CreateFlowNodes(container, flowBuilder);
}
//Add the remaining hyperlinks at the end of the page
flowBuilder.AddLeftoverHyperlinks();
flowBuilder.AddEndNode();
}
//We will need to have a special case for an empty page
private void _CreateFlowNodes(FixedSOMContainer node, FlowModelBuilder flowBuilder)
{
FixedElement.ElementType[] elementsForNode = node.ElementTypes;
foreach (FixedElement.ElementType type in elementsForNode)
{
flowBuilder.AddStartNode(type);
node.SetRTFProperties(flowBuilder.FixedElement);
}
List<FixedSOMSemanticBox> children = node.SemanticBoxes;
foreach (FixedSOMSemanticBox box in children)
{
if (box is FixedSOMElement)
{
flowBuilder.AddElement((FixedSOMElement)box);
}
else if (box is FixedSOMContainer)
{
_CreateFlowNodes((FixedSOMContainer)box, flowBuilder);
}
else
{
Debug.Assert(false);
}
}
foreach (FixedElement.ElementType type in elementsForNode)
{
flowBuilder.AddEndNode();
}
}
//--------------------------------------------------------------------
// Fixed Document
//---------------------------------------------------------------------
private bool _IsStartVisual(int visualIndex)
{
return visualIndex == FixedFlowMap.FixedOrderStartVisual;
}
private bool _IsEndVisual(int visualIndex)
{
return visualIndex == FixedFlowMap.FixedOrderEndVisual;
}
private bool _IsBoundaryPage(int pageIndex)
{
return ( pageIndex == FixedFlowMap.FixedOrderStartPage
|| pageIndex == FixedFlowMap.FixedOrderEndPage
);
}
// Advance the scope ID -- called when a new flow scope is needed.
// the scope ID is used to identify the flow scope in flow order.
//
// For instance:
// <Start Id=1> <TextRun Id=1> <Image Id=2> <TextRun Id=1> <TextRun Id=1> <End Id=1>
// All Id =1 consists of one scope while Id=2 opens a new scope (in this case a nested scope).
//
private int _NewScopeId()
{
return _nextScopeId++;
}
private static bool _IsRTL(char c)
{
/*return (c > 0x590 && c < 0x780) ||
(c >= 0xFB1D && c <= 0xFDFD) ||
(c >= 0xFE70 && c <= 0xFEFC);*/
return (c >= 0x5D0 && c <= 0x60B) ||
(c == 0x60D) ||
(c >= 0x61B && c <= 0x64A) ||
(c >= 0x66D && c <= 0x6D5 && c != 0x670) ||
(c == 0x6DD) || (c == 0x6E5) || (c == 0x6E6) ||
(c == 0x6EE) || (c == 0x6EF) ||
(c >= 0x6FA && c <= 0x70D) ||
(c == 0x710) || (c >= 0x712 && c <= 0x72F) ||
(c >= 0x74D && c <= 0x7A5) || (c == 0x7B1) ||
(c == 0xFB1D) || (c >= 0xFB1F && c <= 0xFD3D && c != 0xFB29) ||
(c >= 0xFD50 && c <= 0xFDFC) || (c >= 0xFE70 && c <= 0xFEFC);
}
#endregion Private Methods
//--------------------------------------------------------------------
//
// Private Properties
//
//---------------------------------------------------------------------
#region Private Properties
#endregion Private Properties
//--------------------------------------------------------------------
//
// Private Fields
//
//---------------------------------------------------------------------
#region Private Fields
private readonly FixedTextContainer _container; // page container
private List<FixedPageStructure> _pageStructures; // contain all FixedPageStructure for each page.
private int _nextScopeId; // Next FlowNode ScopeId
private FixedFlowMap _fixedFlowMap;
private static bool[] _cTable = new bool[] { true, //0x5BF //Combining marks table
false, true, true, false, // 0x5C0 - 3
true, true, false, true, //0x5C4
true, true, //0x6D6 - 7
true, true, true, true, //0x6D8 - B
true, false, false, true, //C - F
true, true, true, true, //0x6E0 - 3
true, false, false, true, //0x6E4 - 7
true, false, true, true, //0x6E8 - B
true, true //C, D
};
#endregion Private Fields
//--------------------------------------------------------------------
//
// Private Class
//
//--------------------------------------------------------------------
#region Private Class
internal sealed class FlowModelBuilder
{
private sealed class LogicalHyperlink
{
public LogicalHyperlink(Uri uri, Geometry geom, UIElement uiElement)
{
_uiElement = uiElement;
_uri = uri;
_geometry = geom;
_boundingRect = geom.Bounds; //Get bounding rect
_used = false;
}
public Uri Uri
{
get
{
return _uri;
}
}
public Geometry Geometry
{
get
{
return _geometry;
}
}
public Rect BoundingRect
{
get
{
return _boundingRect;
}
}
public UIElement UIElement
{
get
{
return _uiElement;
}
}
public bool Used
{
get
{
return _used;
}
set
{
_used = value;
}
}
private UIElement _uiElement;
private Uri _uri;
private Geometry _geometry;
private Rect _boundingRect;
private bool _used;
}
private sealed class LogicalHyperlinkContainer : IEnumerable<LogicalHyperlink>
{
public LogicalHyperlinkContainer()
{
_hyperlinks = new List<LogicalHyperlink>();
}
IEnumerator<LogicalHyperlink> IEnumerable<LogicalHyperlink>.GetEnumerator()
{
return _hyperlinks.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return _hyperlinks.GetEnumerator();
}
public void AddLogicalHyperlink(Uri uri, Geometry geometry, UIElement uiElement)
{
LogicalHyperlink hyperlink = new LogicalHyperlink(uri, geometry, uiElement);
_hyperlinks.Add(hyperlink);
}
//Returns a Uri that is associated with a SOMElement if there is one
//Also returns the actual UIElement as an output variable if a Path with NavigateUri
//is used to make this SOMElement look like an actual hyperlink
public Uri GetUri(FixedSOMElement element, FixedPage p, out UIElement shadowElement)
{
shadowElement = null;
UIElement e = p.GetElement(element.FixedNode) as UIElement;
if (e == null)
{
Debug.Assert(false);
return null;
}
LogicalHyperlink logicalHyperlink = null;
Uri relUri = FixedPage.GetNavigateUri(e);
if (relUri == null && _hyperlinks.Count > 0)
{
Transform t = e.TransformToAncestor(p) as Transform;
Geometry g;
if (e is Glyphs)
{
GlyphRun run = ((Glyphs)e).ToGlyphRun();
Rect designRect = run.ComputeAlignmentBox();
designRect.Offset(run.BaselineOrigin.X, run.BaselineOrigin.Y);
g = new RectangleGeometry(designRect);
}
else if (e is Path)
{
g = ((Path)e).Data;
}
else
{
Debug.Assert(e is Image);
Image im = (Image)e;
g = new RectangleGeometry(new Rect(0, 0, im.Width, im.Height));
}
logicalHyperlink = _GetHyperlinkFromGeometry(g, t);
if (logicalHyperlink != null)
{
relUri = logicalHyperlink.Uri;
shadowElement = logicalHyperlink.UIElement;
}
}
if (relUri == null)
{
return null;
}
return FixedPage.GetLinkUri(p, relUri);
}
//Marks the hyperlink associated with a specific UIElement as "used"
public void MarkAsUsed(UIElement uiElement)
{
for (int i=0; i<_hyperlinks.Count; i++)
{
LogicalHyperlink hyperlink = _hyperlinks[i];
if (hyperlink.UIElement == uiElement)
{
hyperlink.Used = true;
break;
}
}
}
private LogicalHyperlink _GetHyperlinkFromGeometry(Geometry geom, Transform t)
{
Geometry g = geom;
if (t != null && !t.Value.IsIdentity)
{
g = PathGeometry.CreateFromGeometry(geom);
g.Transform = t;
}
double minArea = g.GetArea() * .99;
Rect r = g.Bounds;
for (int i = 0; i < _hyperlinks.Count; i++)
{
// do fast rect overlap before doing more expensive geometric comparison
if (r.IntersectsWith(_hyperlinks[i].BoundingRect))
{
Geometry combined = Geometry.Combine(g, _hyperlinks[i].Geometry, GeometryCombineMode.Intersect, Transform.Identity);
if (combined.GetArea() > minArea)
{
return _hyperlinks[i];
}
}
}
return null;
}
private List<LogicalHyperlink> _hyperlinks;
}
public FlowModelBuilder(FixedTextBuilder builder, FixedPageStructure pageStructure, FixedPage page)
{
_builder = builder;
_container = builder._container;
_pageIndex = pageStructure.PageIndex;
_textRuns = new List<FixedSOMTextRun>();
_flowNodes = new List<FlowNode>();
_fixedNodes = new List<FixedNode>();
_nodesInLine = new List<FixedNode>();
_lineResults = new List<FixedLineResult>();
_endNodes = new Stack();
_fixedElements = new Stack();
_mapping = builder._fixedFlowMap;
_pageStructure = pageStructure;
_currentFixedElement = _container.ContainerElement;
_lineLayoutBox = Rect.Empty;
_logicalHyperlinkContainer = new LogicalHyperlinkContainer();
_fixedPage = page;
#if DEBUG
_dumpDoc = new XmlDocument();
_currentDumpNode = _dumpDoc.CreateElement("FlowModel");
_dumpDoc.AppendChild(_currentDumpNode);
#endif
}
public void FindHyperlinkPaths(FrameworkElement elem)
{
//we are only interested in hyperlinks created by putting Path on top of a Gyphs element
Debug.Assert(elem is FixedPage || elem is Canvas);
IEnumerable children = LogicalTreeHelper.GetChildren(elem);
foreach (UIElement child in children)
{
Canvas canvas = child as Canvas;
if (canvas != null)
{
FindHyperlinkPaths(canvas);
}
if (!(child is Path) || ((Path)child).Fill is ImageBrush)
{
// ignore these, these are content
continue;
}
Uri navUri = FixedPage.GetNavigateUri(child);
if (navUri != null && ((Path)child).Data != null)
{
Transform trans = child.TransformToAncestor(_fixedPage) as Transform;
Geometry geom = ((Path)child).Data;
if (trans != null && !trans.Value.IsIdentity)
{
geom = PathGeometry.CreateFromGeometry(geom);
geom.Transform = trans;
}
_logicalHyperlinkContainer.AddLogicalHyperlink(navUri, geom, child);
}
}
}
public void AddLeftoverHyperlinks()
{
foreach (LogicalHyperlink hyperlink in _logicalHyperlinkContainer)
{
if (!hyperlink.Used)
{
_AddStartNode(FixedElement.ElementType.Paragraph);
_AddStartNode(FixedElement.ElementType.Hyperlink);
_currentFixedElement.SetValue(Hyperlink.NavigateUriProperty, hyperlink.Uri);
_currentFixedElement.SetValue(FixedElement.HelpTextProperty, (String) (hyperlink.UIElement.GetValue(AutomationProperties.HelpTextProperty)));
_currentFixedElement.SetValue(FixedElement.NameProperty, (String) (hyperlink.UIElement.GetValue(AutomationProperties.NameProperty)));
_AddEndNode();
_AddEndNode();
}
}
}
//Use this for start tags
public void AddStartNode(FixedElement.ElementType type)
{
_FinishTextRun(true);
_FinishHyperlink();
_AddStartNode(type);
}
public void AddEndNode()
{
_FinishTextRun(false);
_FinishHyperlink();
_AddEndNode();
}
//Use this for images and text runs -- generates necessary flow nodes
public void AddElement(FixedSOMElement element)
{
FixedPage page = _builder.GetFixedPage(element.FixedNode);
UIElement shadowHyperlink;
Uri navUri = _logicalHyperlinkContainer.GetUri(element, page, out shadowHyperlink);
if (element is FixedSOMTextRun)
{
// Will add code to get font info for rich copy here
FixedSOMTextRun run = element as FixedSOMTextRun;
bool createNewRun = (_currentRun == null) || (!run.HasSameRichProperties(_currentRun))
|| navUri != _currentNavUri || (navUri != null && navUri.ToString() != _currentNavUri.ToString());
if (createNewRun)
{
if (_currentRun != null)
{
//Close existing inline tag
FixedSOMFixedBlock parent = run.FixedBlock;
FixedSOMTextRun lastRun = _textRuns[_textRuns.Count - 1];
Glyphs currentRunGlyph = _builder.GetGlyphsElement(lastRun.FixedNode);
Glyphs glyphs = _builder.GetGlyphsElement(run.FixedNode);
GlyphComparison comparison = _builder._CompareGlyphs(currentRunGlyph, glyphs);
bool addSpace = false;
if (_builder._IsNonContiguous(lastRun, run, comparison))
{
addSpace = true;
}
_FinishTextRun(addSpace);
}
_SetHyperlink(navUri, run.FixedNode, shadowHyperlink);
//Open new Run tag and set RTF props
_AddStartNode(FixedElement.ElementType.Run);
run.SetRTFProperties(_currentFixedElement);
_currentRun = run;
}
_textRuns.Add((FixedSOMTextRun)element);
if (_fixedNodes.Count == 0 || _fixedNodes[_fixedNodes.Count - 1] != element.FixedNode)
{
_fixedNodes.Add(element.FixedNode);
}
}
else if (element is FixedSOMImage)
{
FixedSOMImage image = (FixedSOMImage)element;
_FinishTextRun(true);
_SetHyperlink(navUri, image.FixedNode, shadowHyperlink);
_AddStartNode(FixedElement.ElementType.InlineUIContainer);
FlowNode flowImageNode = new FlowNode(_NewScopeId(), FlowNodeType.Object, null);
// Create a new FixedElement to represent this new node.
_container.OnNewFlowElement(_currentFixedElement,
FixedElement.ElementType.Object,
new FlowPosition(_container, flowImageNode, 0),
new FlowPosition(_container, flowImageNode, 1),
image.Source,
_pageIndex
);
_flowNodes.Add(flowImageNode);
// Do fixed/flow mapping for image
element.FlowNode = flowImageNode;
flowImageNode.FixedSOMElements = new FixedSOMElement[] { element };
_mapping.AddFixedElement(element);
// Do we need this?
_fixedNodes.Add(element.FixedNode);
//copy automation properties
FixedElement fElement = (FixedElement)flowImageNode.Cookie;
fElement.SetValue(FixedElement.NameProperty, image.Name);
fElement.SetValue(FixedElement.HelpTextProperty, image.HelpText);
_AddEndNode();
}
else
{
Debug.Assert(false);
}
}
public void FinishMapping()
{
_FinishLine();
_mapping.MappingReplace(_pageStructure.FlowStart, _flowNodes);
_pageStructure.SetFlowBoundary(_flowNodes[0], _flowNodes[_flowNodes.Count-1]);
_pageStructure.SetupLineResults(_lineResults.ToArray());
}
#if DEBUG
public void DumpToFile(string file)
{
//_dumpDoc.Save(file);
StringWriter writer = new StringWriter();
_dumpDoc.Save(writer);
}
private void DumpFlowNode(FlowNode node)
{
FixedElement element = node.Cookie as FixedElement;
if (element != null)
{
XmlElement newDumpNode = _dumpDoc.CreateElement(element.Type.Name);
newDumpNode.SetAttribute("id", node.ScopeId.ToString());
_currentDumpNode.AppendChild(newDumpNode);
_currentDumpNode = newDumpNode;
}
else
{
//Run
int nodeLength = (int) node.Cookie;
_currentDumpNode.SetAttribute("Cookie", nodeLength.ToString());
FixedSOMElement[] somElems = node.FixedSOMElements;
if (somElems!=null)
{
StringBuilder strBuilder = new StringBuilder();
foreach (FixedSOMElement somElem in somElems)
{
FixedSOMTextRun run = somElem as FixedSOMTextRun;
if (run != null)
{
strBuilder.Append(run.Text);
}
}
_currentDumpNode.InnerText = strBuilder.ToString();
}
}
}
#endif
private void _AddStartNode(FixedElement.ElementType type)
{
FlowNode startNode = new FlowNode(_NewScopeId(), FlowNodeType.Start, _pageIndex);
FlowNode endNode = new FlowNode(_NewScopeId(), FlowNodeType.End, _pageIndex);
// add fixed element
_container.OnNewFlowElement(_currentFixedElement, //_container.ContainerElement,
type,
new FlowPosition(_container, (FlowNode)startNode, 1),
new FlowPosition(_container, (FlowNode)endNode, 0),
null,
_pageIndex
);
// Create fixed element
_fixedElements.Push(_currentFixedElement);
_currentFixedElement = (FixedElement)startNode.Cookie;
_flowNodes.Add(startNode);
_endNodes.Push(endNode);
#if DEBUG
DumpFlowNode(startNode);
#endif
}
private void _AddEndNode()
{
_flowNodes.Add((FlowNode)_endNodes.Pop());
_currentFixedElement = (FixedElement)_fixedElements.Pop();
#if DEBUG
_currentDumpNode = (XmlElement) _currentDumpNode.ParentNode;
#endif
}
private void _FinishTextRun(bool addSpace)
{
if (_textRuns.Count > 0)
{
int textRunLength = 0;
FixedSOMTextRun run = null;
for (int i=0; i<_textRuns.Count; i++)
{
run = _textRuns[i];
Glyphs glyphs = _builder.GetGlyphsElement(run.FixedNode);
GlyphComparison comparison = _builder._CompareGlyphs(_lastGlyphs, glyphs);
if (comparison == GlyphComparison.DifferentLine)
{
_FinishLine();
}
_lastGlyphs = glyphs;
_lineLayoutBox.Union(run.BoundingRect);
run.LineIndex = _lineResults.Count;
if (_nodesInLine.Count == 0 || _nodesInLine[_nodesInLine.Count - 1] != run.FixedNode)
{
_nodesInLine.Add(run.FixedNode);
}
textRunLength += run.EndIndex - run.StartIndex;
Debug.Assert(run.EndIndex - run.StartIndex == run.Text.Length);
if (i>0 && _builder._IsNonContiguous(_textRuns[i-1], run, comparison))
{
_textRuns[i-1].Text = $"{_textRuns[i - 1].Text} ";
textRunLength++;
}
}
if (addSpace && run.Text.Length>0 && !run.Text.EndsWith(" ", StringComparison.Ordinal) && !IsHyphen(run.Text[run.Text.Length - 1]))
{
run.Text = $"{run.Text} ";
textRunLength ++;
}
if (textRunLength != 0)
{
FlowNode flowNodeRun = new FlowNode(_NewScopeId(), FlowNodeType.Run, textRunLength);
// Add list of text runs to flow node
flowNodeRun.FixedSOMElements = _textRuns.ToArray();
int offset = 0;
foreach (FixedSOMTextRun textRun in _textRuns)
{
textRun.FlowNode = flowNodeRun;
textRun.OffsetInFlowNode = offset;
_mapping.AddFixedElement(textRun);
offset += textRun.Text.Length;
}
//Debug.Assert(offset == textRunLength);
_flowNodes.Add(flowNodeRun);
#if DEBUG
DumpFlowNode(flowNodeRun);
#endif
// clear the list
_textRuns.Clear();
}
}
//Close the inline tag if any
if (_currentRun != null)
{
_AddEndNode();
_currentRun = null;
}
}
private void _FinishHyperlink()
{
if (_currentNavUri != null)
{
_AddEndNode(); // </Hyperlink>
_currentNavUri = null;
}
}
private void _SetHyperlink(Uri navUri, FixedNode node, UIElement shadowHyperlink)
{
if (navUri != _currentNavUri || (navUri != null && navUri.ToString() != _currentNavUri.ToString()))
{
if (_currentNavUri != null)
{
_AddEndNode(); // </Hyperlink>
}
if (navUri != null)
{
_AddStartNode(FixedElement.ElementType.Hyperlink);
_currentFixedElement.SetValue(Hyperlink.NavigateUriProperty, navUri);
UIElement uiElement = _fixedPage.GetElement(node) as UIElement;
Debug.Assert(uiElement != null);
if (uiElement != null)
{
_currentFixedElement.SetValue(FixedElement.HelpTextProperty, (String) (uiElement.GetValue(AutomationProperties.HelpTextProperty)));
_currentFixedElement.SetValue(FixedElement.NameProperty, (String) (uiElement.GetValue(AutomationProperties.NameProperty)));
if (shadowHyperlink != null)
{
_logicalHyperlinkContainer.MarkAsUsed(shadowHyperlink);
}
}
}
_currentNavUri = navUri;
}
}
private void _FinishLine()
{
if (_nodesInLine.Count > 0)
{
FixedLineResult newLineResult = new FixedLineResult(_nodesInLine.ToArray(), _lineLayoutBox);
Debug.Assert(newLineResult != null);
_lineResults.Add(newLineResult);
_nodesInLine.Clear();
_lineLayoutBox = Rect.Empty;
}
}
private int _NewScopeId()
{
return _builder._nextScopeId++;
}
public FixedElement FixedElement
{
get
{
return _currentFixedElement;
}
}
private int _pageIndex;
private FixedTextContainer _container;
private FixedTextBuilder _builder;
private List<FixedSOMTextRun> _textRuns;
private List<FlowNode> _flowNodes;
private List<FixedNode> _fixedNodes;
private List<FixedNode> _nodesInLine;
private List<FixedLineResult> _lineResults;
private Rect _lineLayoutBox;
private Stack _endNodes;
private Stack _fixedElements;
private FixedElement _currentFixedElement;
private FixedFlowMap _mapping;
private FixedPageStructure _pageStructure;
private Glyphs _lastGlyphs;
private FixedSOMTextRun _currentRun;
private LogicalHyperlinkContainer _logicalHyperlinkContainer;
private FixedPage _fixedPage;
private Uri _currentNavUri;
#if DEBUG
private XmlDocument _dumpDoc;
private XmlElement _currentDumpNode;
#endif
}
internal enum GlyphComparison
{
DifferentLine,
SameLine,
Adjacent, //also on same line
Unknown
}
#endregion
}
}
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