|
public CompareTo ( |
||
| position | ||
| return | int | |
//---------------------------
// public static methods
//---------------------------
/// <summary>
/// resolves text effect on a text range to a list of text effect targets.
/// The method will walk the text and perform the following task:
/// 1) For each continous block of text, create a text effect targeting the scoping element
/// 2) For the text effect created, calculate the starting cp index and cp count for the effect
///
/// The method will create freezable copy of the TextEffect passed in and fill in
/// CharacterIndex and Count for the range.
/// </summary>
/// <param name="startPosition">starting text pointer</param>
/// <param name="endPosition">end text pointer</param>
/// <param name="effect">effect that is apply on the text</param>
public static TextEffectTarget[] Resolve(
TextPointer startPosition,
TextPointer endPosition,
TextEffect effect
)
{
if (effect == null)
throw new ArgumentNullException("effect");
ValidationHelper.VerifyPositionPair(startPosition, endPosition);
TextPointer effectStart = new TextPointer(startPosition);
// move to the first character symbol at or after Start position
MoveToFirstCharacterSymbol(effectStart);
TextEffect effectCopy;
List<TextEffectTarget> list = new List<TextEffectTarget>();
// we will now traverse the TOM and resolve text effects to the immediate parent
// of the characters. We are effectively applying the text effect onto
// block of continous text.
while (effectStart.CompareTo(endPosition) < 0)
{
// create a copy of the text effect
// so that we can set the CharacterIndex and Count
effectCopy = effect.Clone();
// create a position
TextPointer continuousTextEnd = new TextPointer(effectStart);
// move the position to the end of the continuous text block
MoveToFirstNonCharacterSymbol(continuousTextEnd, endPosition);
// make sure we are not out of the range
continuousTextEnd = (TextPointer)TextPointerBase.Min(continuousTextEnd, endPosition);
// set the character index to be the distance from the Start
// of this text block to the Start of the text container
effectCopy.PositionStart = effectStart.TextContainer.Start.GetOffsetToPosition(effectStart);
// count is the distance from the text block start to end
effectCopy.PositionCount = effectStart.GetOffsetToPosition(continuousTextEnd);
list.Add(
new TextEffectTarget(
effectStart.Parent,
effectCopy
)
);
// move the effectStart to the beginning of the next text block.
effectStart = continuousTextEnd;
MoveToFirstCharacterSymbol(effectStart);
}
return list.ToArray();
}
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
//------------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal methods.
/// <summary>
/// Writes the container into the specified XmlWriter.
/// </summary>
internal void Write(TextPointer start, TextPointer end, XmlWriter writer)
{
System.Diagnostics.Debug.Assert(start != null);
System.Diagnostics.Debug.Assert(end != null);
System.Diagnostics.Debug.Assert(start.CompareTo(end) <= 0);
System.Diagnostics.Debug.Assert(writer != null);
WriteContainer(start, end, writer);
}
// move to the first non-character symbol, but not pass beyond the limit
private static void MoveToFirstNonCharacterSymbol(
TextPointer navigator, // navigator to move
TextPointer stopHint // don't move further if we already pass beyond this point
)
{
while (navigator.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text &&
navigator.CompareTo(stopHint) < 0 &&
navigator.MoveToNextContextPosition(LogicalDirection.Forward))
{
;
}
}
private static int GetCharOffsetToPosition(InlineCollection inlineCollection, TextPointer position, out TextPointer result)
{
int offset = 0;
foreach (var inline in inlineCollection)
{
offset += GetCharOffsetToPosition(inline, position, out result);
if (result == null || result.CompareTo(position) >= 0)
return offset;
}
result = null;
return offset;
}
private static int GetCharOffsetToPosition(BlockCollection blockCollection, TextPointer position, out TextPointer result)
{
int offset = 0;
foreach (var block in blockCollection)
{
offset += GetCharOffsetToPosition(block, position, out result);
if (result == null || result.CompareTo(position) >= 0)
return offset;
}
result = null;
return offset;
}
public static int GetCharOffsetToPosition(this FlowDocument document, TextPointer position)
{
if (document == null)
throw new ArgumentNullException("document");
if (position == null)
throw new ArgumentNullException("position");
if (position.CompareTo(document.ContentStart) == 0)
return 0;
TextPointer result;
return GetCharOffsetToPosition(document.Blocks, position, out result);
}
internal override Rect[] GetCharacterRects(TextPointer startPointer, TextPointer endPointer)
{
if (!invalidatedCache && cachedStartP != null && startPointer.CompareTo(cachedStartP) == 0)
{
return cachedRects;
}
else
{
cachedRects = base.GetCharacterRects(startPointer, endPointer);
cachedStartP = startPointer;
invalidatedCache = false;
}
return cachedRects;
}
// Token: 0x06003E2C RID: 15916 RVA: 0x0011D638 File Offset: 0x0011B838
internal static TextTreeDeleteContentUndoUnit CreateDeleteContentUndoUnit(TextContainer tree, TextPointer start, TextPointer end)
{
if (start.CompareTo(end) == 0)
{
return(null);
}
UndoManager orClearUndoManager = TextTreeUndo.GetOrClearUndoManager(tree);
if (orClearUndoManager == null)
{
return(null);
}
TextTreeDeleteContentUndoUnit textTreeDeleteContentUndoUnit = new TextTreeDeleteContentUndoUnit(tree, start, end);
orClearUndoManager.Add(textTreeDeleteContentUndoUnit);
return(textTreeDeleteContentUndoUnit);
}
// Adds a DeleteContentUndoUnit to the open parent undo unit, if any.
// Called by TextContainer.DeleteContent.
internal static TextTreeDeleteContentUndoUnit CreateDeleteContentUndoUnit(TextContainer tree, TextPointer start, TextPointer end)
{
UndoManager undoManager;
TextTreeDeleteContentUndoUnit undoUnit;
if (start.CompareTo(end) == 0)
return null;
undoManager = GetOrClearUndoManager(tree);
if (undoManager == null)
return null;
undoUnit = new TextTreeDeleteContentUndoUnit(tree, start, end);
undoManager.Add(undoUnit);
return undoUnit;
}
/// <summary>Initializes a new instance of the <see cref="T:System.Windows.Documents.Hyperlink" /> class, taking two <see cref="T:System.Windows.Documents.TextPointer" /> objects that indicate the beginning and end of a selection of content to be contained by the new <see cref="T:System.Windows.Documents.Hyperlink" />.</summary>
/// <param name="start">A <see cref="T:System.Windows.Documents.TextPointer" /> indicating the beginning of a selection of content to be contained by the new <see cref="T:System.Windows.Documents.Hyperlink" />.</param>
/// <param name="end">A <see cref="T:System.Windows.Documents.TextPointer" /> indicating the end of a selection of content to be contained by the new <see cref="T:System.Windows.Documents.Hyperlink" />.</param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="start" /> or <paramref name="end" /> is <see langword="null" />.</exception>
/// <exception cref="T:System.ArgumentException">
/// <paramref name="start" /> and <paramref name="end" /> do not resolve to a range of content suitable for enclosure by a <see cref="T:System.Windows.Documents.Span" /> element; for example, if <paramref name="start" /> and <paramref name="end" /> indicate positions in different paragraphs.</exception>
// Token: 0x0600301F RID: 12319 RVA: 0x000D8A18 File Offset: 0x000D6C18
public Hyperlink(TextPointer start, TextPointer end) : base(start, end)
{
TextPointer textPointer = base.ContentStart.CreatePointer();
TextPointer contentEnd = base.ContentEnd;
while (textPointer.CompareTo(contentEnd) < 0)
{
Hyperlink hyperlink = textPointer.GetAdjacentElement(LogicalDirection.Forward) as Hyperlink;
if (hyperlink != null)
{
hyperlink.Reposition(null, null);
}
else
{
textPointer.MoveToNextContextPosition(LogicalDirection.Forward);
}
}
}
//-------------------------------------------------------------------
//
// Internal Methods
//
//-------------------------------------------------------------------
#region Internal Methods
/// <summary>
/// Returns the integer "index" of a specified ListItem that is an immediate child of
/// this List. This index is defined to be a sequential counter of ListElementItems only
/// (skipping other elements) among this List's immediate children.
///
/// The list item index of the first child of type ListItem is specified by
/// this.StartListIndex, which has a default value of 1.
///
/// The index returned by this method is used in the formation of some ListItem
/// markers such as "(b)" and "viii." (as opposed to others, like disks and wedges,
/// which are not sequential-position-dependent).
/// </summary>
/// <param name="item">The item whose index is to be returned.</param>
/// <returns>Returns the index of a specified ListItem.</returns>
internal int GetListItemIndex(ListItem item)
{
// Check for valid arg
if (item == null)
{
throw new ArgumentNullException("item");
}
if (item.Parent != this)
{
throw new InvalidOperationException(SR.Get(SRID.ListElementItemNotAChildOfList));
}
// Count ListItem siblings (not other element types) back to first item.
int itemIndex = StartIndex;
TextPointer textNav = new TextPointer(this.ContentStart);
while (textNav.CompareTo(this.ContentEnd) != 0)
{
// ListItem is a content element, so look for ElementStart runs only
if (textNav.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementStart)
{
DependencyObject element = textNav.GetAdjacentElementFromOuterPosition(LogicalDirection.Forward);
if (element is ListItem)
{
if (element == item)
{
break;
}
if (itemIndex < int.MaxValue)
{
++itemIndex;
}
}
// Skip entire content element content, because we are looking
// only for immediate children.
textNav.MoveToPosition(((TextElement)element).ElementEnd);
}
else
{
textNav.MoveToNextContextPosition(LogicalDirection.Forward);
}
}
return(itemIndex);
}
// Checks whether two paragraphs are meargeable.
// To be meargeable they need to be separated by s sequence of closing, then opening
// tags only.
// And all tags must be Sections/Lists/ListItems only.
internal static bool ParagraphsAreMergeable(Block firstParagraphOrBlockUIContainer, Block secondParagraphOrBlockUIContainer)
{
if (firstParagraphOrBlockUIContainer == null || secondParagraphOrBlockUIContainer == null ||
firstParagraphOrBlockUIContainer == secondParagraphOrBlockUIContainer)
{
return(false); // nothing to merge
}
TextPointer position = firstParagraphOrBlockUIContainer.ElementEnd;
TextPointer startOfSecondParagraph = secondParagraphOrBlockUIContainer.ElementStart;
// Skip and check all closing tags (if any)
while (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementEnd)
{
if (!TextSchema.AllowsParagraphMerging(position.Parent.GetType()))
{
return(false); // Crossing hard-structured element. Paragraphs are not meargeable.
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
// Skip and check all opening tags (if any)
while (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementStart)
{
if (position.CompareTo(startOfSecondParagraph) == 0)
{
// Successfully skipped all tags, and reached the seconfParagraph.
// The paragraphs are meargeable.
return(true);
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
if (!TextSchema.AllowsParagraphMerging(position.Parent.GetType()))
{
return(false); // Crossing hardd-structured element. Paragraphs are not meargeable.
}
}
// Non-tag run found. Paragraphs are not meargeable.
return(false);
}
/// <summary>
/// Creates a new Hyperlink instance covering existing content.
/// </summary>
/// <param name="start">
/// Start position of the new Hyperlink.
/// </param>
/// <param name="end">
/// End position of the new Hyperlink.
/// </param>
/// <remarks>
/// start and end must both be parented by the same Paragraph, otherwise
/// the method will raise an ArgumentException.
/// </remarks>
public Hyperlink(TextPointer start, TextPointer end) : base(start, end)
{
// After inserting this Hyperlink, we need to extract any child Hyperlinks.
TextPointer navigator = this.ContentStart.CreatePointer();
TextPointer stop = this.ContentEnd;
while (navigator.CompareTo(stop) < 0)
{
Hyperlink hyperlink = navigator.GetAdjacentElement(LogicalDirection.Forward) as Hyperlink;
if (hyperlink != null)
{
hyperlink.Reposition(null, null);
}
else
{
navigator.MoveToNextContextPosition(LogicalDirection.Forward);
}
}
}
// Adds a DeleteContentUndoUnit to the open parent undo unit, if any.
// Called by TextContainer.DeleteContent.
internal static TextTreeDeleteContentUndoUnit CreateDeleteContentUndoUnit(TextContainer tree, TextPointer start, TextPointer end)
{
UndoManager undoManager;
TextTreeDeleteContentUndoUnit undoUnit;
if (start.CompareTo(end) == 0)
{
return(null);
}
undoManager = GetOrClearUndoManager(tree);
if (undoManager == null)
{
return(null);
}
undoUnit = new TextTreeDeleteContentUndoUnit(tree, start, end);
undoManager.Add(undoUnit);
return(undoUnit);
}
// Token: 0x060031B9 RID: 12729 RVA: 0x000DBB64 File Offset: 0x000D9D64
internal int GetListItemIndex(ListItem item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (item.Parent != this)
{
throw new InvalidOperationException(SR.Get("ListElementItemNotAChildOfList"));
}
int num = this.StartIndex;
TextPointer textPointer = new TextPointer(base.ContentStart);
while (textPointer.CompareTo(base.ContentEnd) != 0)
{
if (textPointer.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementStart)
{
DependencyObject adjacentElementFromOuterPosition = textPointer.GetAdjacentElementFromOuterPosition(LogicalDirection.Forward);
if (adjacentElementFromOuterPosition is ListItem)
{
if (adjacentElementFromOuterPosition == item)
{
break;
}
if (num < 2147483647)
{
num++;
}
}
textPointer.MoveToPosition(((TextElement)adjacentElementFromOuterPosition).ElementEnd);
}
else
{
textPointer.MoveToNextContextPosition(LogicalDirection.Forward);
}
}
return(num);
}
/// <summary>
/// Find the input string within the document, starting at the specified position.
/// </summary>
/// <param name="position">the current text position</param>
/// <param name="input">input text</param>
/// <returns>An <see cref="TextRange"/> representing the (next) matching string within the text container. Null if there are no matches.</returns>
public TextRange FindNext(ref TextPointer position, String input)
{
FindText(input);
foreach (var result in _searchHits)
{
if (position.CompareTo(result.End) < 0)
{
position = result.Start;
double top = this.PointToScreen(position.GetLineStartPosition(0).GetCharacterRect(LogicalDirection.Forward).TopLeft).Y + this.PointFromScreen(new System.Windows.Point(0, 0)).Y;
Trace.WriteLine(string.Format(" Top: {0}, CharOffset: {1}", top, position));
ScrollViewer.ScrollToVerticalOffset(ScrollViewer.VerticalOffset + top);
position = result.End;
return result;
}
}
return null;
}
// Token: 0x06003922 RID: 14626 RVA: 0x001031AC File Offset: 0x001013AC
private static void MoveToFirstNonCharacterSymbol(TextPointer navigator, TextPointer stopHint)
{
while (navigator.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text && navigator.CompareTo(stopHint) < 0 && navigator.MoveToNextContextPosition(LogicalDirection.Forward))
{
}
}
// ....................................................................
//
// Row editing
//
// ....................................................................
#region Row Editing
/// <summary>
/// Checks whether the given TextPointer is at row end position, where text insertion is impossible
/// and returns a following position where text insertion or pasting is valid.
/// New paragraphs is creeated at the end of TextContainer if necessary.
/// </summary>
internal static TextPointer EnsureInsertionPosition(TextPointer position)
{
Invariant.Assert(position != null, "null check: position");
// Normalize the pointer
position = position.GetInsertionPosition(position.LogicalDirection);
if (!TextPointerBase.IsAtInsertionPosition(position))
{
// There is no insertion positions in the whole document at all.
// Generate minimally necessary content to ensure at least one insertion position.
position = CreateInsertionPositionInIncompleteContent(position);
}
else
{
// Check if position is at one of special structural boundary positions, where we can potentially have an
// insertion position and create one.
if (position.IsAtRowEnd)
{
// Find a next insertion position within the scope of the parent table.
Table currentTable = TextRangeEditTables.GetTableFromPosition(position);
position = GetAdjustedRowEndPosition(currentTable, position);
if (position.CompareTo(currentTable.ElementEnd) == 0)
{
// The range is at the end of table which is the last block of text container OR
// next insertion position crossed table boundary.
// In both cases, we want to insert a paragraph after table end and move our insertion position there.
position = CreateImplicitParagraph(currentTable.ElementEnd);
}
}
Invariant.Assert(!position.IsAtRowEnd, "position is not expected to be at RowEnd anymore");
// Note that this is not an else if, because our next insertion position (if it is within the same table),
// can fall into one of the following cases. We need to handle it.
if (TextPointerBase.IsInBlockUIContainer(position))
{
BlockUIContainer blockUIContainer = (BlockUIContainer)position.Parent;
bool insertBefore = position.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart;
position = insertBefore
? CreateImplicitParagraph(blockUIContainer.ElementStart)
: CreateImplicitParagraph(blockUIContainer.ElementEnd);
// Clean potentialy incomplete content
if (blockUIContainer.IsEmpty)
{
blockUIContainer.RepositionWithContent(null);
}
}
else if (TextPointerBase.IsBeforeFirstTable(position) || TextPointerBase.IsAtPotentialParagraphPosition(position))
{
position = CreateImplicitParagraph(position);
}
else if (TextPointerBase.IsAtPotentialRunPosition(position))
{
position = CreateImplicitRun(position);
}
}
Invariant.Assert(TextSchema.IsInTextContent(position), "position must be in text content now");
return position;
}
/// <summary>
/// Deletes all equi-scoped segments of content from start TextPointer
/// up to fragment root. Thus clears one half of a fragment.
/// The other half remains untouched.
/// All elements whose boundaries are crossed by this range
/// remain in the tree (except for emptied formatting elements).
/// </summary>
/// <param name="start">
/// A position from which content clearinng starts.
/// All content segments between this position and a fragment
/// root will be deleted.
/// </param>
/// <param name="end">
/// A position indicating the other boundary of a fragment.
/// This position is used for fragment root identification.
/// </param>
private static void DeleteEquiScopedContent(TextPointer start, TextPointer end)
{
// Validate parameters
Invariant.Assert(start != null, "null check: start");
Invariant.Assert(end != null, "null check: end");
if (start.CompareTo(end) == 0)
{
return;
}
if (start.Parent == end.Parent)
{
DeleteContentBetweenPositions(start, end);
return;
}
// Identify directional parameters
LogicalDirection direction;
LogicalDirection oppositeDirection;
TextPointerContext enterScopeSymbol;
TextPointerContext leaveScopeSymbol;
ElementEdge edgeBeforeElement;
ElementEdge edgeAfterElement;
if (start.CompareTo(end) < 0)
{
direction = LogicalDirection.Forward;
oppositeDirection = LogicalDirection.Backward;
enterScopeSymbol = TextPointerContext.ElementStart;
leaveScopeSymbol = TextPointerContext.ElementEnd;
edgeBeforeElement = ElementEdge.BeforeStart;
edgeAfterElement = ElementEdge.AfterEnd;
}
else
{
direction = LogicalDirection.Backward;
oppositeDirection = LogicalDirection.Forward;
enterScopeSymbol = TextPointerContext.ElementEnd;
leaveScopeSymbol = TextPointerContext.ElementStart;
edgeBeforeElement = ElementEdge.AfterEnd;
edgeAfterElement = ElementEdge.BeforeStart;
}
// previousPosition will store a location where nondeleted content starts
TextPointer previousPosition = new TextPointer(start);
// nextPosition runs toward other end until level change -
// so that we could delete all content from previousPosition
// to nextPosition at once.
TextPointer nextPosition = new TextPointer(start);
// Run nextPosition forward until the very end of affected range
while (nextPosition.CompareTo(end) != 0)
{
Invariant.Assert(direction == LogicalDirection.Forward && nextPosition.CompareTo(end) < 0 || direction == LogicalDirection.Backward && nextPosition.CompareTo(end) > 0,
"Inappropriate position ordering");
Invariant.Assert(previousPosition.Parent == nextPosition.Parent, "inconsistent position Parents: previous and next");
TextPointerContext pointerContext = nextPosition.GetPointerContext(direction);
if (pointerContext == TextPointerContext.Text || pointerContext == TextPointerContext.EmbeddedElement)
{
// Add this run to a collection of equi-scoped content
nextPosition.MoveToNextContextPosition(direction);
// Check if we went too far and return a little to end if necessary
if (direction == LogicalDirection.Forward && nextPosition.CompareTo(end) > 0 || direction == LogicalDirection.Backward && nextPosition.CompareTo(end) < 0)
{
Invariant.Assert(nextPosition.Parent == end.Parent, "inconsistent poaition Parents: next and end");
nextPosition.MoveToPosition(end);
break;
}
}
else if (pointerContext == enterScopeSymbol)
{
// Jump over the element and continue collecting equi-scoped content
nextPosition.MoveToNextContextPosition(direction);
((ITextPointer)nextPosition).MoveToElementEdge(edgeAfterElement);
// If our range crosses the element then we stop before its opening tag
if (direction == LogicalDirection.Forward && nextPosition.CompareTo(end) >= 0 || direction == LogicalDirection.Backward && nextPosition.CompareTo(end) <= 0)
{
nextPosition.MoveToNextContextPosition(oppositeDirection);
((ITextPointer)nextPosition).MoveToElementEdge(edgeBeforeElement);
break;
}
}
else if (pointerContext == leaveScopeSymbol)
{
// Delete preceding content and continue on outer level
DeleteContentBetweenPositions(previousPosition, nextPosition);
if (!ExtractEmptyFormattingElements(previousPosition))
{
// Continue on outer level
Invariant.Assert(nextPosition.GetPointerContext(direction) == leaveScopeSymbol, "Unexpected context of nextPosition");
nextPosition.MoveToNextContextPosition(direction);
}
previousPosition.MoveToPosition(nextPosition);
}
else
{
Invariant.Assert(false, "Not expecting None context here");
Invariant.Assert(pointerContext == TextPointerContext.None, "Unknown pointer context");
break;
}
}
Invariant.Assert(previousPosition.Parent == nextPosition.Parent, "inconsistent Parents: previousPosition, nextPosition");
DeleteContentBetweenPositions(previousPosition, nextPosition);
}
/// <summary>
/// Creates a new Span instance covering existing content.
/// </summary>
/// <param name="start">
/// Start position of the new Span.
/// </param>
/// <param name="end">
/// End position of the new Span.
/// </param>
/// <remarks>
/// start and end must both be parented by the same Paragraph, otherwise
/// the method will raise an ArgumentException.
/// </remarks>
public Span(TextPointer start, TextPointer end)
{
if (start == null)
{
throw new ArgumentNullException("start");
}
if (end == null)
{
throw new ArgumentNullException("start");
}
if (start.TextContainer != end.TextContainer)
{
throw new ArgumentException(SR.Get(SRID.InDifferentTextContainers, "start", "end"));
}
if (start.CompareTo(end) > 0)
{
throw new ArgumentException(SR.Get(SRID.BadTextPositionOrder, "start", "end"));
}
start.TextContainer.BeginChange();
try
{
start = TextRangeEditTables.EnsureInsertionPosition(start);
Invariant.Assert(start.Parent is Run);
end = TextRangeEditTables.EnsureInsertionPosition(end);
Invariant.Assert(end.Parent is Run);
if (start.Paragraph != end.Paragraph)
{
throw new ArgumentException(SR.Get(SRID.InDifferentParagraphs, "start", "end"));
}
// If start or end positions have a Hyperlink ancestor, we cannot split them.
Inline nonMergeableAncestor;
if ((nonMergeableAncestor = start.GetNonMergeableInlineAncestor()) != null)
{
throw new InvalidOperationException(SR.Get(SRID.TextSchema_CannotSplitElement, nonMergeableAncestor.GetType().Name));
}
if ((nonMergeableAncestor = end.GetNonMergeableInlineAncestor()) != null)
{
throw new InvalidOperationException(SR.Get(SRID.TextSchema_CannotSplitElement, nonMergeableAncestor.GetType().Name));
}
TextElement commonAncestor = TextElement.GetCommonAncestor((TextElement)start.Parent, (TextElement)end.Parent);
while (start.Parent != commonAncestor)
{
start = SplitElement(start);
}
while (end.Parent != commonAncestor)
{
end = SplitElement(end);
}
if (start.Parent is Run)
{
start = SplitElement(start);
}
if (end.Parent is Run)
{
end = SplitElement(end);
}
Invariant.Assert(start.Parent == end.Parent);
Invariant.Assert(TextSchema.IsValidChild(/*position*/ start, /*childType*/ typeof(Span)));
this.Reposition(start, end);
}
finally
{
start.TextContainer.EndChange();
}
}
internal static bool UnindentListItems(TextRange range)
{
// If listitems in this range cross a list boundary, we cannot unindent them.
if (!IsRangeWithinSingleList(range))
{
return(false);
}
ListItem firstListItem = TextPointerBase.GetListItem(range.Start);
ListItem lastListItem = TextPointerBase.GetListItem((TextPointer)TextRangeEdit.GetAdjustedRangeEnd(range.Start, range.End));
// At this point it is possible that lastListItem is a child of
// firstListItem.
//
// This is due to a special case in IsRangeWithinSingleList
// which allows the input TextRange to cross List boundaries only
// in the case where the TextRange ends adjacent to an insertion
// position at the same level as the start, e.g.:
//
// - parent item
// - start item (range starts here)
// - child item (range ends here)
// <start item must not have any siblings>
//
// Here we check for that special case and ensure that
// lastListItem is at the same level as firstListItem.
TextElement parent = (TextElement)lastListItem.Parent;
while (parent != firstListItem.Parent)
{
lastListItem = parent as ListItem;
parent = (TextElement)parent.Parent;
}
if (lastListItem == null)
{
// This can happen if the input is a fragment, a collection
// of ListItems not parented by an outer List.
return(false);
}
// Cut wrapping list before startListItem
if (firstListItem.PreviousListItem != null)
{
TextRangeEdit.SplitElement(firstListItem.ElementStart);
}
// Cut wrapping list after endListItem
if (lastListItem.NextListItem != null)
{
TextRangeEdit.SplitElement(lastListItem.ElementEnd);
}
// Remove List wrapper from selected items
List unindentedList = (List)firstListItem.Parent;
// Check whether we have outer ListItem
ListItem outerListItem = unindentedList.Parent as ListItem;
if (outerListItem != null)
{
// Selected items belong to a nested list.
// So we need to pull them to the level of enclosing ListItem, i.e. cut this ListItem.
// In this case we also need to include trailing list into the last of selected items
// Remove a wrapping List from selected items
unindentedList.Reposition(null, null);
// Remember end position of outerListItem to pull any trailing list or other blocks into the last of selected listitems
TextPointer outerListItemEnd = outerListItem.ContentEnd;
if (outerListItem.ContentStart.CompareTo(firstListItem.ElementStart) == 0)
{
// There is nothing before first list item; so outer list item would be empty - just delete it
outerListItem.Reposition(null, null);
}
else
{
// Wrap all stuff preceding firstListItem in outerListItem
outerListItem.Reposition(outerListItem.ContentStart, firstListItem.ElementStart);
}
if (outerListItemEnd.CompareTo(lastListItem.ElementEnd) == 0)
{
// There are no following siblings to pull into last selected item; do nothing.
}
else
{
// Pull trailing items (following siblings to the selected ones) into the last selected item
// Remember a position to merge any trailing list after lastListItem
TextPointer mergePosition = lastListItem.ContentEnd;
// Reposition last selectd ListItem so that it includes trailing list (or other block) as its children
lastListItem.Reposition(lastListItem.ContentStart, outerListItemEnd);
// Merge any trailing list with a sublist outdented with our listitem
MergeLists(mergePosition);
}
}
else
{
// Selected items are not in nested list.
// We need to simply unwrap them and convert to paragraphs
TextPointer start = unindentedList.ElementStart;
TextPointer end = unindentedList.ElementEnd;
// Save the list's FlowDirection value, to apply later to its children.
object listFlowDirectionValue = unindentedList.GetValue(Paragraph.FlowDirectionProperty);
// Remove a wrapping List from selected items
unindentedList.Reposition(null, null);
// Remove ListItems from all selected items
ListItem listItem = firstListItem;
while (listItem != null)
{
ListItem nextListItem = listItem.ElementEnd.GetAdjacentElement(LogicalDirection.Forward) as ListItem;
// If this is an empty <ListItem></ListItem>, insert an explicit paragraph in it before deleting the list item.
if (listItem.ContentStart.CompareTo(listItem.ContentEnd) == 0)
{
TextRangeEditTables.EnsureInsertionPosition(listItem.ContentStart);
}
listItem.Reposition(null, null);
listItem = listItem == lastListItem ? null : nextListItem;
}
// Apply FlowDirection of the list just deleted to all its children.
TextRangeEdit.SetParagraphProperty(start, end, Paragraph.FlowDirectionProperty, listFlowDirectionValue);
// Merge lists on boundaries
MergeLists(start);
MergeLists(end);
}
return(true);
}
// Token: 0x06003B85 RID: 15237 RVA: 0x0010F26C File Offset: 0x0010D46C
internal static bool UnindentListItems(TextRange range)
{
if (!TextRangeEditLists.IsRangeWithinSingleList(range))
{
return(false);
}
ListItem listItem = TextPointerBase.GetListItem(range.Start);
ListItem listItem2 = TextPointerBase.GetListItem((TextPointer)TextRangeEdit.GetAdjustedRangeEnd(range.Start, range.End));
for (TextElement textElement = (TextElement)listItem2.Parent; textElement != listItem.Parent; textElement = (TextElement)textElement.Parent)
{
listItem2 = (textElement as ListItem);
}
if (listItem2 == null)
{
return(false);
}
if (listItem.PreviousListItem != null)
{
TextRangeEdit.SplitElement(listItem.ElementStart);
}
if (listItem2.NextListItem != null)
{
TextRangeEdit.SplitElement(listItem2.ElementEnd);
}
List list = (List)listItem.Parent;
ListItem listItem3 = list.Parent as ListItem;
if (listItem3 != null)
{
list.Reposition(null, null);
TextPointer contentEnd = listItem3.ContentEnd;
if (listItem3.ContentStart.CompareTo(listItem.ElementStart) == 0)
{
listItem3.Reposition(null, null);
}
else
{
listItem3.Reposition(listItem3.ContentStart, listItem.ElementStart);
}
if (contentEnd.CompareTo(listItem2.ElementEnd) != 0)
{
TextPointer contentEnd2 = listItem2.ContentEnd;
listItem2.Reposition(listItem2.ContentStart, contentEnd);
TextRangeEditLists.MergeLists(contentEnd2);
}
}
else
{
TextPointer elementStart = list.ElementStart;
TextPointer elementEnd = list.ElementEnd;
object value = list.GetValue(Block.FlowDirectionProperty);
list.Reposition(null, null);
ListItem listItem5;
for (ListItem listItem4 = listItem; listItem4 != null; listItem4 = ((listItem4 == listItem2) ? null : listItem5))
{
listItem5 = (listItem4.ElementEnd.GetAdjacentElement(LogicalDirection.Forward) as ListItem);
if (listItem4.ContentStart.CompareTo(listItem4.ContentEnd) == 0)
{
TextRangeEditTables.EnsureInsertionPosition(listItem4.ContentStart);
}
listItem4.Reposition(null, null);
}
TextRangeEdit.SetParagraphProperty(elementStart, elementEnd, Block.FlowDirectionProperty, value);
TextRangeEditLists.MergeLists(elementStart);
TextRangeEditLists.MergeLists(elementEnd);
}
return(true);
}
/// <summary>
/// Applies a property to a range between start and end positions.
/// </summary>
/// <param name="start">
/// TextPointer identifying start of affected range.
/// </param>
/// <param name="end">
/// TextPointer identifying end of affected range.
/// </param>
/// <param name="formattingProperty">
/// A dependency property whose value is supposed to applied to a range.
/// </param>
/// <param name="value">
/// A value for a property to apply.
/// </param>
/// <param name="propertyValueAction">
/// Specifies how to use the value - as absolute, as increment or a decrement.
/// </param>
internal static void SetInlineProperty(TextPointer start, TextPointer end, DependencyProperty formattingProperty, object value, PropertyValueAction propertyValueAction)
{
// Check for corner case when we have siple text run with all properties set as requested.
// This case is iportant optimization for Backspace-Type scenario, when Springload formatting applies for nothing for 50 properties
if (start.CompareTo(end) >= 0 ||
propertyValueAction == PropertyValueAction.SetValue &&
start.Parent is Run &&
start.Parent == end.Parent && TextSchema.ValuesAreEqual(start.Parent.GetValue(formattingProperty), value))
{
return;
}
// Remove unnecessary spans on range ends - to optimize resulting markup
RemoveUnnecessarySpans(start);
RemoveUnnecessarySpans(end);
if (TextSchema.IsStructuralCharacterProperty(formattingProperty))
{
SetStructuralInlineProperty(start, end, formattingProperty, value);
}
else
{
SetNonStructuralInlineProperty(start, end, formattingProperty, value, propertyValueAction);
}
}
// Helper that walks paragraphs between start and end positions, applying passed formattingProperty value on them.
private static void ApplyStructuralInlinePropertyAcrossParagraphs(TextPointer start, TextPointer end, DependencyProperty formattingProperty, object value)
{
// We assume to call this method only for paragraph crossing case
Invariant.Assert(start.Paragraph != null);
Invariant.Assert(start.Paragraph.ContentEnd.CompareTo(end) < 0);
// Apply to first Paragraph
SetStructuralInlineProperty(start, start.Paragraph.ContentEnd, formattingProperty, value);
start = start.Paragraph.ElementEnd;
// Apply to last paragraph
if (end.Paragraph != null)
{
SetStructuralInlineProperty(end.Paragraph.ContentStart, end, formattingProperty, value);
end = end.Paragraph.ElementStart;
}
// Now, loop through paragraphs between start and end positions
while (start != null && start.CompareTo(end) < 0)
{
if (start.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart &&
start.Parent is Paragraph)
{
Paragraph paragraph = (Paragraph)start.Parent;
// Apply property to paragraph just found.
SetStructuralInlineProperty(paragraph.ContentStart, paragraph.ContentEnd, formattingProperty, value);
// Jump to Paragraph end to skip Inline formatting tags.
start = paragraph.ElementEnd;
}
start = start.GetNextContextPosition(LogicalDirection.Forward);
}
}
private static void ApplyStructuralInlinePropertyAcrossRun(TextPointer start, TextPointer end, Run run, DependencyProperty formattingProperty, object value)
{
if (start.CompareTo(end) == 0)
{
// When the range is empty we should ignore the command, except
// for the case of empty Run which can be encountered in empty paragraphs
if (run.IsEmpty)
{
run.SetValue(formattingProperty, value);
}
}
else
{
// Split elements at start and end boundaries.
start = SplitFormattingElements(start, /*keepEmptyFormatting:*/false, /*limitingAncestor*/run.Parent as TextElement);
end = SplitFormattingElements(end, /*keepEmptyFormatting:*/false, /*limitingAncestor*/run.Parent as TextElement);
run = (Run)start.GetAdjacentElement(LogicalDirection.Forward);
run.SetValue(formattingProperty, value);
}
// Clear property value from all ancestors of this Run.
FixupStructuralPropertyEnvironment(run, formattingProperty);
}
// Helper that walks Run and Span elements between start and end positions,
// clearing value of passed formattingProperty on them.
//
private static void ClearPropertyValueFromSpansAndRuns(TextPointer start, TextPointer end, DependencyProperty formattingProperty)
{
// Normalize start position forward.
start = start.GetPositionAtOffset(0, LogicalDirection.Forward);
// Move to next context position before entering loop below,
// since in the loop we look backward.
start = start.GetNextContextPosition(LogicalDirection.Forward);
while (start != null && start.CompareTo(end) < 0)
{
if (start.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart &&
TextSchema.IsFormattingType(start.Parent.GetType())) // look for Run/Span elements
{
start.Parent.ClearValue(formattingProperty);
// Remove unnecessary Spans around this position, delete empty formatting elements (if any)
// and merge with adjacent inlines if they have identical set of formatting properties.
MergeFormattingInlines(start);
}
start = start.GetNextContextPosition(LogicalDirection.Forward);
}
}
// Finds a Run element with ElementStart at or after the given pointer
// Creates Runs at potential run positions if encounters some.
private static Run GetNextRun(TextPointer pointer, TextPointer limit)
{
Run run = null;
while (pointer != null && pointer.CompareTo(limit) < 0)
{
if (pointer.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementStart &&
(run = pointer.GetAdjacentElement(LogicalDirection.Forward) as Run) != null)
{
break;
}
if (TextPointerBase.IsAtPotentialRunPosition(pointer))
{
pointer = TextRangeEditTables.EnsureInsertionPosition(pointer);
Invariant.Assert(pointer.Parent is Run);
run = pointer.Parent as Run;
break;
}
// Advance the scanning pointer
pointer = pointer.GetNextContextPosition(LogicalDirection.Forward);
}
return run;
}
/// <summary>
/// Helper for TextContainer.DeleteContent allowing arbitrary
/// order of positions and doinng nothing in case of empty range.
/// Removes remaining empty formatting elements - if they not inside empty blocks.
/// </summary>
/// <param name="one">
/// One of content boundary positions. May precede or follow the TextPointer two.
/// Must belong to the same scope as TextPointer two.
/// </param>
/// <param name="two">
/// Another content boundary position. May precede or follow the TextPointer one.
/// Must belong to the same scope as TextPointer one.
/// </param>
/// <returns>
/// true if surrounding formatting elements have beed deleted as a side effect.
/// </returns>
private static bool DeleteContentBetweenPositions(TextPointer one, TextPointer two)
{
Invariant.Assert(one.Parent == two.Parent, "inconsistent Parents: one and two");
if (one.CompareTo(two) < 0)
{
one.TextContainer.DeleteContentInternal(one, two);
}
else if (one.CompareTo(two) > 0)
{
two.TextContainer.DeleteContentInternal(two, one);
}
Invariant.Assert(one.CompareTo(two) == 0, "Positions one and two must be equal now");
return false;
}
public static TextRange FindText(TextPointer findContainerStartPosition, TextPointer findContainerEndPosition, String input, FindFlags flags, CultureInfo cultureInfo)
{
TextRange textRange = null;
if (findContainerStartPosition.CompareTo(findContainerEndPosition) < 0)
{
try
{
if (findMethod == null)
{
findMethod = typeof(FrameworkElement).Assembly.GetType("System.Windows.Documents.TextFindEngine").
GetMethod("Find", BindingFlags.Static | BindingFlags.Public);
}
textRange = findMethod.Invoke(null,
new Object[] { findContainerStartPosition,
findContainerEndPosition,
input,
flags,
CultureInfo.CurrentCulture
}) as TextRange;
}
catch (ApplicationException)
{
textRange = null;
}
}
return textRange;
}
/// <summary>Initializes a new instance of the <see cref="T:System.Windows.Documents.Span" /> class, taking two <see cref="T:System.Windows.Documents.TextPointer" /> objects that indicate the beginning and end of a selection of content that the new <see cref="T:System.Windows.Documents.Span" /> will contain.</summary>
/// <param name="start">A <see cref="T:System.Windows.Documents.TextPointer" /> that indicates the beginning of a selection of content that the new <see cref="T:System.Windows.Documents.Span" /> will contain.</param>
/// <param name="end">A <see cref="T:System.Windows.Documents.TextPointer" /> that indicates the end of a selection of content that the new <see cref="T:System.Windows.Documents.Span" /> will contain.</param>
/// <exception cref="T:System.ArgumentNullException">Raised when <paramref name="start" /> or <paramref name="end" /> is null.</exception>
/// <exception cref="T:System.ArgumentException">Raised when <paramref name="start" /> and <paramref name="end" /> do not resolve to a range of content suitable for enclosure by a <see cref="T:System.Windows.Documents.Span" /> element; for example, if <paramref name="start" /> and <paramref name="end" /> indicate positions in different paragraphs.</exception>
// Token: 0x06003543 RID: 13635 RVA: 0x000F1218 File Offset: 0x000EF418
public Span(TextPointer start, TextPointer end)
{
if (start == null)
{
throw new ArgumentNullException("start");
}
if (end == null)
{
throw new ArgumentNullException("start");
}
if (start.TextContainer != end.TextContainer)
{
throw new ArgumentException(SR.Get("InDifferentTextContainers", new object[]
{
"start",
"end"
}));
}
if (start.CompareTo(end) > 0)
{
throw new ArgumentException(SR.Get("BadTextPositionOrder", new object[]
{
"start",
"end"
}));
}
start.TextContainer.BeginChange();
try
{
start = TextRangeEditTables.EnsureInsertionPosition(start);
Invariant.Assert(start.Parent is Run);
end = TextRangeEditTables.EnsureInsertionPosition(end);
Invariant.Assert(end.Parent is Run);
if (start.Paragraph != end.Paragraph)
{
throw new ArgumentException(SR.Get("InDifferentParagraphs", new object[]
{
"start",
"end"
}));
}
Inline nonMergeableInlineAncestor;
if ((nonMergeableInlineAncestor = start.GetNonMergeableInlineAncestor()) != null)
{
throw new InvalidOperationException(SR.Get("TextSchema_CannotSplitElement", new object[]
{
nonMergeableInlineAncestor.GetType().Name
}));
}
if ((nonMergeableInlineAncestor = end.GetNonMergeableInlineAncestor()) != null)
{
throw new InvalidOperationException(SR.Get("TextSchema_CannotSplitElement", new object[]
{
nonMergeableInlineAncestor.GetType().Name
}));
}
TextElement commonAncestor = TextElement.GetCommonAncestor((TextElement)start.Parent, (TextElement)end.Parent);
while (start.Parent != commonAncestor)
{
start = this.SplitElement(start);
}
while (end.Parent != commonAncestor)
{
end = this.SplitElement(end);
}
if (start.Parent is Run)
{
start = this.SplitElement(start);
}
if (end.Parent is Run)
{
end = this.SplitElement(end);
}
Invariant.Assert(start.Parent == end.Parent);
Invariant.Assert(TextSchema.IsValidChild(start, typeof(Span)));
base.Reposition(start, end);
}
finally
{
start.TextContainer.EndChange();
}
}
/// <summary>
/// Applies formatting properties for whole block elements.
/// </summary>
/// <param name="start">
/// a position within first block in sequence
/// </param>
/// <param name="end">
/// a positionn within last block in sequence
/// </param>
/// <param name="property">
/// property changed on blocks
/// </param>
/// <param name="value">
/// value for the property
/// </param>
/// <param name="propertyValueAction">
/// Specifies how to use the value - as absolute, as increment or a decrement.
/// </param>
internal static void SetParagraphProperty(TextPointer start, TextPointer end, DependencyProperty property, object value, PropertyValueAction propertyValueAction)
{
Invariant.Assert(start != null, "null check: start");
Invariant.Assert(end != null, "null check: end");
Invariant.Assert(start.CompareTo(end) <= 0, "expecting: start <= end");
Invariant.Assert(property != null, "null check: property");
// Exclude last opening tag to avoid affecting a paragraph following the selection
end = (TextPointer)TextRangeEdit.GetAdjustedRangeEnd(start, end);
// Expand start pointer to the beginning of the first paragraph/blockuicontainer
Block startParagraphOrBlockUIContainer = start.ParagraphOrBlockUIContainer;
if (startParagraphOrBlockUIContainer != null)
{
start = startParagraphOrBlockUIContainer.ContentStart;
}
// Applying FlowDirection requires splitting all containing lists on the range boundaries
// because the property is applied to whole List element (to affect bullet appearence)
if (property == Block.FlowDirectionProperty)
{
// Split any boundary lists if needed.
// We want to maintain the invariant that all lists and paragraphs within a list, have the same FlowDirection value.
// If paragraph FlowDirection command requests a different value of FlowDirection on parts of a list,
// we split the list to maintain this invariant.
if (!TextRangeEditLists.SplitListsForFlowDirectionChange(start, end, value))
{
// If lists at start and end cannot be split successfully, we cannot apply FlowDirection property to the paragraph content.
return;
}
// And expand range start to the beginning of the containing list
ListItem listItem = start.GetListAncestor();
if (listItem != null && listItem.List != null)
{
start = listItem.List.ElementStart;
}
}
// Walk all paragraphs in the affected segment. For FlowDirection property, also walk lists.
SetParagraphPropertyWorker(start, end, property, value, propertyValueAction);
}
/// <summary>
/// Makes sure that the content spanned by the range is totally deleted
/// including all structural elements and boundaries.
/// We need this method to be able to make the range empty for any kind of content.
/// This operation is straightforward for all kinds of ranges expect for
/// TableCellRange. For cell range it means merging all selected cells
/// and deleting the text content of resulting cell.
/// </summary>
internal static void DeleteContent(TextPointer start, TextPointer end)
{
// Order positions, as we do not to distinguish between anchor/moving ends in this operation;
// but the following code depends on start<=end ordering
if (start.CompareTo(end) > 0)
{
TextPointer whatWasEnd = end;
end = start;
start = whatWasEnd;
}
// Check whether we cross table structure boundaries
TableCell startCell;
TableCell endCell;
TableRow startRow;
TableRow endRow;
TableRowGroup startRowGroup;
TableRowGroup endRowGroup;
Table startTable;
Table endTable;
// We need to run a loop here because after boundary tables deletions
// we may encounter following tables, so that start/end range will be
// again table-crossing.
while (
start.CompareTo(end) < 0
&&
IdentifyTableElements(
/*anchorPosition:*/start, /*movingPosition:*/end,
/*includeCellAtMovingPosition:*/false,
out startCell, out endCell,
out startRow, out endRow,
out startRowGroup, out endRowGroup,
out startTable, out endTable))
{
if (startTable == null && endTable == null || startTable == endTable)
{
bool isTableCellRange;
List<TextSegment> textSegments = TextRangeEditTables.BuildTableRange(
/*anchorPosition:*/start,
/*movingPosition:*/end,
/*includeCellAtMovingPosition*/false,
out isTableCellRange);
if (isTableCellRange && textSegments != null)
{
// It is cell selection. Create the content of all selected cells
for (int i = 0; i < textSegments.Count; i++)
{
ClearTableCells(textSegments[i]);
}
// Collapse the range to bypass the folowing paragraph deletion
end = start;
}
else
{
// Our range is within one table, so we need to delete
// crossed row boundaries
// Find start row
if (startCell != null)
{
startRow = startCell.Row;
}
else if (startRow != null)
{
// do nothing here. we already have a start row for deletion.
}
else if (startRowGroup != null)
{
startRow = startRowGroup.Rows[0];
}
// Find end row
if (endCell != null)
{
endRow = startCell.Row;
}
else if (endRow != null)
{
// do nothing here. we already have an end row for deletion.
}
else if (endRowGroup != null)
{
endRow = endRowGroup.Rows[endRowGroup.Rows.Count - 1];
}
Invariant.Assert(startRow != null && endRow != null, "startRow and endRow cannot be null, since our range is within one table");
TextRange rowsSegment = new TextRange(startRow.ContentStart, endRow.ContentEnd);
TextRangeEditTables.DeleteRows(rowsSegment); // it will take care of rowspans
}
}
else
{
// Table boundary is crossed on one or both of edges.
// So we must delete half(s) of crossed table(s)
if (startRow != null)
{
// Table boundary is crossed on start edge.
// So we need to delete all rows from start to the end of this table.
// Store position immediately after the first table
start = startRow.Table.ElementEnd;
// Delete all rows from startRow to the very end of the table
TextRange rowsSegment = new TextRange(startRow.ContentStart, startRow.Table.ContentEnd);
TextRangeEditTables.DeleteRows(rowsSegment); // it will take care of rowspans
}
if (endRow != null)
{
// Table boundary is crossed on end egde.
// So we need to delete all rows from start of the table to this endRow.
// Store position immediately before the second table
end = endRow.Table.ElementStart;
// Delete all rows from the beginning of the table to endRow
TextRange rowsSegment = new TextRange(endRow.Table.ContentStart, endRow.ContentEnd);
TextRangeEditTables.DeleteRows(rowsSegment);
}
}
}
// Now that we do not cross table structure, we can apply simple paragraph content deletion.
// Delete remaining content between tables
if (start.CompareTo(end) < 0)
{
// Note that both start and end are not normalized here,
// which is important, say, when the block between deleted tables
// was another Table or something - we want to delete the whole thing, whatever it is
// and normalizting start/end would cross its boundary.
TextRangeEdit.DeleteParagraphContent(start, end);
}
}
// Validates that the sibling element at this position belong to expected itemType (Inline, Block, ListItem)
private static void ValidateMergingPositions(Type itemType, TextPointer start, TextPointer end)
{
if (start.CompareTo(end) < 0)
{
// Verify inner part
TextPointerContext forwardFromStart = start.GetPointerContext(LogicalDirection.Forward);
TextPointerContext backwardFromEnd = end.GetPointerContext(LogicalDirection.Backward);
Invariant.Assert(forwardFromStart == TextPointerContext.ElementStart, "Expecting first opening tag of pasted fragment");
Invariant.Assert(backwardFromEnd == TextPointerContext.ElementEnd, "Expecting last closing tag of pasted fragment");
Invariant.Assert(itemType.IsAssignableFrom(start.GetAdjacentElement(LogicalDirection.Forward).GetType()), "The first pasted fragment item is expected to be a " + itemType.Name);
Invariant.Assert(itemType.IsAssignableFrom(end.GetAdjacentElement(LogicalDirection.Backward).GetType()), "The last pasted fragment item is expected to be a " + itemType.Name);
// Veryfy outer part
TextPointerContext backwardFromStart = start.GetPointerContext(LogicalDirection.Backward);
TextPointerContext forwardFromEnd = end.GetPointerContext(LogicalDirection.Forward);
Invariant.Assert(backwardFromStart == TextPointerContext.ElementStart || backwardFromStart == TextPointerContext.ElementEnd || backwardFromStart == TextPointerContext.None, "Bad context preceding a pasted fragment");
Invariant.Assert(!(backwardFromStart == TextPointerContext.ElementEnd) || itemType.IsAssignableFrom(start.GetAdjacentElement(LogicalDirection.Backward).GetType()), "An element preceding a pasted fragment is expected to be a " + itemType.Name);
Invariant.Assert(forwardFromEnd == TextPointerContext.ElementStart || forwardFromEnd == TextPointerContext.ElementEnd || forwardFromEnd == TextPointerContext.None, "Bad context following a pasted fragment");
Invariant.Assert(!(forwardFromEnd == TextPointerContext.ElementStart) || itemType.IsAssignableFrom(end.GetAdjacentElement(LogicalDirection.Forward).GetType()), "An element following a pasted fragment is expected to be a " + itemType.Name);
}
}
// ------------------------------------------------------------------
// IContentHost Helpers
// ------------------------------------------------------------------
/// <summary>
/// Searches for an element in the _complexContent.TextContainer. If the element is found, returns the
/// position at which it is found. Otherwise returns null.
/// </summary>
/// <param name="e">
/// Element to be found.
/// </param>
/// <remarks>
/// We assume that this function is called from within text if the caller knows that _complexContent exists
/// and contains a TextContainer. Hence we assert for this condition within the function
/// </remarks>
private TextPointer FindElementPosition(IInputElement e)
{
// Parameter validation
Debug.Assert(e != null);
// Validate that this function is only called when a TextContainer exists as complex content
Debug.Assert(_complexContent.TextContainer is TextContainer);
TextPointer position;
// If e is a TextElement we can optimize by checking its TextContainer
if (e is TextElement)
{
if ((e as TextElement).TextContainer == _complexContent.TextContainer)
{
// Element found
position = new TextPointer((e as TextElement).ElementStart);
return position;
}
}
// Else: search for e in the complex content
position = new TextPointer((TextPointer)_complexContent.TextContainer.Start);
while (position.CompareTo((TextPointer)_complexContent.TextContainer.End) < 0)
{
// Search each position in _complexContent.TextContainer for the element
switch (position.GetPointerContext(LogicalDirection.Forward))
{
case TextPointerContext.EmbeddedElement:
DependencyObject embeddedObject = position.GetAdjacentElement(LogicalDirection.Forward);
if (embeddedObject is ContentElement || embeddedObject is UIElement)
{
if (embeddedObject == e as ContentElement || embeddedObject == e as UIElement)
{
return position;
}
}
break;
default:
break;
}
position.MoveByOffset(+1);
}
// Reached end of complex content without finding the element
return null;
}
// Applies one property to a range from start to end to simulate inheritance of this property from source conntext
private static void ApplyContextualProperty(Type targetType, TextPointer start, TextPointer end, DependencyProperty property, object value)
{
if (TextSchema.ValuesAreEqual(start.Parent.GetValue(property), value))
{
return; // The property at insertion position is the same as it was in source context. Nothing to do.
}
// Advance start pointer to enter pasted fragment
start = start.GetNextContextPosition(LogicalDirection.Forward);
while (start != null && start.CompareTo(end) < 0)
{
TextPointerContext passedContext = start.GetPointerContext(LogicalDirection.Backward);
if (passedContext == TextPointerContext.ElementStart)
{
TextElement element = (TextElement)start.Parent;
// Check if this element affects the property in question
if (element.ReadLocalValue(property) != DependencyProperty.UnsetValue ||
!TextSchema.ValuesAreEqual(element.GetValue(property), element.Parent.GetValue(property)))
{
// The element affects this property, so we can skip it
start = element.ElementEnd;
}
else if (targetType.IsAssignableFrom(element.GetType()))
{
start = element.ElementEnd;
if (targetType == typeof(Block) && start.CompareTo(end) > 0)
{
// Contextual properties should not apply to the last paragraph
// when it is merged with the following content -
// to avoid affecting the folowing visible content formatting.
break;
}
// This is topmost-level inline element which inherits this property.
// Set the value explicitly
if (!TextSchema.ValuesAreEqual(value, element.GetValue(property)))
{
element.ClearValue(property);
if (!TextSchema.ValuesAreEqual(value, element.GetValue(property)))
{
element.SetValue(property, value);
}
TextRangeEdit.MergeFormattingInlines(element.ElementStart);
}
}
else
{
// Traverse down into a structured (non-innline) element
start = start.GetNextContextPosition(LogicalDirection.Forward);
}
}
else
{
// Traverse up from any element
Invariant.Assert(passedContext != TextPointerContext.None, "TextPointerContext.None is not expected");
start = start.GetNextContextPosition(LogicalDirection.Forward);
}
}
}
/// <summary>
/// Find the corresponding <see cref="TextRange"/> instance
/// representing the input string given a specified text pointer position.
/// </summary>
/// <param name="position">the current text position</param>
/// <param name="textToFind">input text</param>
/// <param name="findOptions">the search option</param>
/// <returns>An <see cref="TextRange"/> instance represeneting the matching string withing the text container.</returns>
public TextRange GetTextRangeFromPosition(ref TextPointer position, String input, FindOptions findOptions)
{
Boolean matchCase = findOptions.MatchCase;
Boolean matchWholeWord = findOptions.MatchWholeWord;
TextRange textRange = null;
while (position != null)
{
if (position.CompareTo(inputDocument.ContentEnd) == 0) //到了文档结尾
{
break;
}
//是文本元素
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
String textRun = position.GetTextInRun(LogicalDirection.Forward); //读取文本
StringComparison stringComparison = matchCase ? StringComparison.CurrentCulture : StringComparison.CurrentCultureIgnoreCase;
//进行查找
Int32 indexInRun = textRun.IndexOf(input, stringComparison);
if (indexInRun >= 0) //找到了
{
position = position.GetPositionAtOffset(indexInRun); //移动文字指针到开头
TextPointer nextPointer = position.GetPositionAtOffset(input.Length); //设定匹配项尾文字指针
textRange = new TextRange(position, nextPointer);
if (matchWholeWord) //是全字匹配的话
{
if (IsWholeWord(textRange)) // 测试匹配项是否是一个单词
{
// 是一个完整的单词
break;
}
else
{
// 找到的不是一个完整的单词,继续在本Run元素中查找
position = position.GetPositionAtOffset(input.Length);
return GetTextRangeFromPosition(ref position, input, findOptions);
}
}
else
{
//不要求全字匹配
position = position.GetPositionAtOffset(input.Length);
break;
}
}
else
{
// 没找到匹配项,移到当前的Run元素之后 "textRun".
position = position.GetPositionAtOffset(textRun.Length);
}
}
else
{
//如果当前位置不是文本类型的元素,继续"前进",跳过这些非文本元素.
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
}
return textRange;
}
// Finds a Paragraph/BlockUIContainer/List element with ElementStart before or at the given pointer
// Creates implicit paragraphs at potential paragraph positions if needed
private static Block GetNextBlock(TextPointer pointer, TextPointer limit)
{
Block block = null;
while (pointer != null && pointer.CompareTo(limit) <= 0)
{
if (pointer.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart)
{
block = pointer.Parent as Block;
if (block is Paragraph || block is BlockUIContainer || block is List)
{
break;
}
}
if (TextPointerBase.IsAtPotentialParagraphPosition(pointer))
{
pointer = TextRangeEditTables.EnsureInsertionPosition(pointer);
block = pointer.Paragraph;
Invariant.Assert(block != null);
break;
}
// Advance the scanning pointer
pointer = pointer.GetNextContextPosition(LogicalDirection.Forward);
}
return block;
}
// Applies a whole property bag to a range from start to end to simulate inheritance of this property from source conntext
private static void ApplyContextualProperties(TextPointer start, TextPointer end, TextElement propertyBag)
{
Invariant.Assert(propertyBag.IsEmpty && propertyBag.Parent == null, "propertyBag is supposed to be an empty element outside any tree");
LocalValueEnumerator contextualProperties = propertyBag.GetLocalValueEnumerator();
while (start.CompareTo(end) < 0 && contextualProperties.MoveNext())
{
// Note: we repeatedly check for IsEmpty because the selection
// may become empty as a result of normalization after formatting
// (thai character sequence).
LocalValueEntry propertyEntry = contextualProperties.Current;
DependencyProperty property = propertyEntry.Property;
if (TextSchema.IsCharacterProperty(property) &&
TextSchema.IsParagraphProperty(property))
{
// In case a property is both an Inline and Paragraph property,
// propertyBag element type (section or span) decides how it should be applied.
if (TextSchema.IsBlock(propertyBag.GetType()))
{
ApplyContextualProperty(typeof(Block), start, end, property, propertyEntry.Value);
}
else
{
ApplyContextualProperty(typeof(Inline), start, end, property, propertyEntry.Value);
}
}
else if (TextSchema.IsCharacterProperty(property))
{
ApplyContextualProperty(typeof(Inline), start, end, property, propertyEntry.Value);
}
else if (TextSchema.IsParagraphProperty(property))
{
ApplyContextualProperty(typeof(Block), start, end, property, propertyEntry.Value);
}
}
// Merge formatting elements at end position
TextRangeEdit.MergeFormattingInlines(start);
TextRangeEdit.MergeFormattingInlines(end);
}
/// <summary>
/// Creates a new Span instance covering existing content.
/// </summary>
/// <param name="start">
/// Start position of the new Span.
/// </param>
/// <param name="end">
/// End position of the new Span.
/// </param>
/// <remarks>
/// start and end must both be parented by the same Paragraph, otherwise
/// the method will raise an ArgumentException.
/// </remarks>
public Span(TextPointer start, TextPointer end)
{
if (start == null)
{
throw new ArgumentNullException("start");
}
if (end == null)
{
throw new ArgumentNullException("start");
}
if (start.TextContainer != end.TextContainer)
{
throw new ArgumentException(SR.Get(SRID.InDifferentTextContainers, "start", "end"));
}
if (start.CompareTo(end) > 0)
{
throw new ArgumentException(SR.Get(SRID.BadTextPositionOrder, "start", "end"));
}
start.TextContainer.BeginChange();
try
{
start = TextRangeEditTables.EnsureInsertionPosition(start);
Invariant.Assert(start.Parent is Run);
end = TextRangeEditTables.EnsureInsertionPosition(end);
Invariant.Assert(end.Parent is Run);
if (start.Paragraph != end.Paragraph)
{
throw new ArgumentException(SR.Get(SRID.InDifferentParagraphs, "start", "end"));
}
// If start or end positions have a Hyperlink ancestor, we cannot split them.
Inline nonMergeableAncestor;
if ((nonMergeableAncestor = start.GetNonMergeableInlineAncestor()) != null)
{
throw new InvalidOperationException(SR.Get(SRID.TextSchema_CannotSplitElement, nonMergeableAncestor.GetType().Name));
}
if ((nonMergeableAncestor = end.GetNonMergeableInlineAncestor()) != null)
{
throw new InvalidOperationException(SR.Get(SRID.TextSchema_CannotSplitElement, nonMergeableAncestor.GetType().Name));
}
TextElement commonAncestor = TextElement.GetCommonAncestor((TextElement)start.Parent, (TextElement)end.Parent);
while (start.Parent != commonAncestor)
{
start = SplitElement(start);
}
while (end.Parent != commonAncestor)
{
end = SplitElement(end);
}
if (start.Parent is Run)
{
start = SplitElement(start);
}
if (end.Parent is Run)
{
end = SplitElement(end);
}
Invariant.Assert(start.Parent == end.Parent);
Invariant.Assert(TextSchema.IsValidChild(/*position*/start, /*childType*/typeof(Span)));
this.Reposition(start, end);
}
finally
{
start.TextContainer.EndChange();
}
}
/// <summary>
/// 根据搜索选项在文档中查找并替换全部匹配字串
/// </summary>
/// <param name="input">要查找的字串</param>
/// <param name="replacement">用于替换的字串</param>
/// <param name="findOptions">搜索选项 </param>
/// <returns>进行了替换的次数</returns>
/// <remarks>
/// 此方法将移动文字指针到最后位置
/// </remarks>
public int ReplaceAll(String input, String replacement, FindOptions findOptions)
{
int count = 0;
currentPosition = inputDocument.ContentStart;
while (currentPosition.CompareTo(inputDocument.ContentEnd) < 0)
{
TextRange textRange = Replace(input, replacement, findOptions);
if (textRange != null)
{
count++;
}
}
return count;
}
/// <summary>
/// UpdateAccessKey - Scans forward in the tree looking for the access key marker, replacing it with access key element. We only support one find.
/// </summary>
private void UpdateAccessKey()
{
TextPointer navigator = new TextPointer(TextContainer.Start);
while (!_accessKeyLocated && navigator.CompareTo(TextContainer.End) < 0 )
{
TextPointerContext symbolType = navigator.GetPointerContext(LogicalDirection.Forward);
switch (symbolType)
{
case TextPointerContext.Text:
string text = navigator.GetTextInRun(LogicalDirection.Forward);
int index = FindAccessKeyMarker(text);
if(index != -1 && index < text.Length - 1)
{
string keyText = StringInfo.GetNextTextElement(text, index + 1);
TextPointer keyEnd = navigator.GetPositionAtOffset(index + 1 + keyText.Length);
_accessKey = new Run(keyText);
_accessKey.Style = AccessKeyStyle;
RegisterAccessKey();
HasCustomSerializationStorage.SetValue(_accessKey, true);
_accessKeyLocated = true;
UninitializeTextContainerListener();
TextContainer.BeginChange();
try
{
TextPointer underlineStart = new TextPointer(navigator, index);
TextRangeEdit.DeleteInlineContent(underlineStart, keyEnd);
_accessKey.RepositionWithContent(underlineStart);
}
finally
{
TextContainer.EndChange();
InitializeTextContainerListener();
}
}
break;
}
navigator.MoveToNextContextPosition(LogicalDirection.Forward);
}
// Convert double _ to single _
navigator = new TextPointer(TextContainer.Start);
string accessKeyMarker = AccessKeyMarker.ToString();
string doubleAccessKeyMarker = accessKeyMarker + accessKeyMarker;
while (navigator.CompareTo(TextContainer.End) < 0)
{
TextPointerContext symbolType = navigator.GetPointerContext(LogicalDirection.Forward);
switch (symbolType)
{
case TextPointerContext.Text:
string text = navigator.GetTextInRun(LogicalDirection.Forward);
string nexText = text.Replace(doubleAccessKeyMarker, accessKeyMarker);
if (text != nexText)
{
TextPointer keyStart = new TextPointer(navigator, 0);
TextPointer keyEnd = new TextPointer(navigator, text.Length);
UninitializeTextContainerListener();
TextContainer.BeginChange();
try
{
keyEnd.InsertTextInRun(nexText);
TextRangeEdit.DeleteInlineContent(keyStart, keyEnd);
}
finally
{
TextContainer.EndChange();
InitializeTextContainerListener();
}
}
break;
}
navigator.MoveToNextContextPosition(LogicalDirection.Forward);
}
}
// Removes inline properties that affect formatting from the given range
internal static void CharacterResetFormatting(TextPointer start, TextPointer end)
{
if (start.CompareTo(end) < 0)
{
// Split formatting elements at range boundaries
start = SplitFormattingElements(start, /*keepEmptyFormatting:*/false, /*preserveStructuralFormatting*/true, /*limitingAncestor*/null);
end = SplitFormattingElements(end, /*keepEmptyFormatting:*/false, /*preserveStructuralFormatting*/true, /*limitingAncestor*/null);
while (start.CompareTo(end) < 0)
{
if (start.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.ElementStart)
{
// When entering a next element check whether we should clear its inline properties.
TextElement parent = (TextElement)start.Parent;
// Note we do cleaning for Inline elements only - so properties set on Paragraphs
// and other blocks will stay unchanged even if they set as local value.
if (parent is Span && parent.ContentEnd.CompareTo(end) > 0)
{
// Preserve Hyperlink/Span properties when it is partially selected
}
// We can't assume that custom types derived from Span, once their formatting
// properties are removed, can be transformed into a Span. So treat custom
// types as inlines, even if they're derived from Span.
else if (parent is Span && TextSchema.IsKnownType(parent.GetType()))
{
// Remember a position to merge inlines
TextPointer mergePosition = parent.ElementStart;
// Preserve only non-formatting properties of original span element.
Span newSpan = TransferNonFormattingInlineProperties((Span)parent);
if (newSpan != null)
{
newSpan.Reposition(parent.ElementStart, parent.ElementEnd);
mergePosition = newSpan.ElementStart;
}
// Throw away original span
parent.Reposition(null, null);
// Now that content has changed, we must try to merge inlines at this position
MergeFormattingInlines(mergePosition);
}
else if (parent is Inline)
{
ClearFormattingInlineProperties((Inline)parent);
// Now that properties may be removed we must try to merge this element with a preceding one
MergeFormattingInlines(parent.ElementStart);
}
}
start = start.GetNextContextPosition(LogicalDirection.Forward);
}
// At the end try ro merge elements at end position
MergeFormattingInlines(end);
}
}
private static List<TextSegment> BuildCrossTableSelection(
TextPointer anchorPosition, TextPointer movingPosition,
TableRow anchorRow, TableRow movingRow)
{
List<TextSegment> textSegments = new List<TextSegment>(1);
if (anchorPosition.CompareTo(movingPosition) < 0)
{
textSegments.Add(
NewNormalizedTextSegment(
anchorRow != null ? anchorRow.ContentStart : anchorPosition,
movingRow != null ? movingRow.ContentEnd : movingPosition));
}
else
{
textSegments.Add(
NewNormalizedTextSegment(
movingRow != null ? movingRow.ContentStart : movingPosition,
anchorRow != null ? anchorRow.ContentEnd : anchorPosition));
}
return textSegments;
}
