// Helper for PasteTextFragment
private static void PasteMergeableTextFragment(TextElement fragment, TextRange range, TextPointer insertionPosition)
{
TextPointer fragmentStart;
TextPointer fragmentEnd;
if (fragment is Span)
{
// Split structure at insertion point in target
insertionPosition = TextRangeEdit.SplitFormattingElements(insertionPosition, /*keepEmptyFormatting:*/false);
Invariant.Assert(insertionPosition.Parent is Paragraph, "insertionPosition must be in a scope of a Paragraph after splitting formatting elements");
// Move the whole Span into the insertion point
fragment.RepositionWithContent(insertionPosition);
// Store edge positions of inserted content
fragmentStart = fragment.ElementStart;
fragmentEnd = fragment.ElementEnd;
// Remove wrapper from a tree
fragment.Reposition(null, null);
ValidateMergingPositions(typeof(Inline), fragmentStart, fragmentEnd);
// Transfer inheritable contextual properties
ApplyContextualProperties(fragmentStart, fragmentEnd, fragment);
}
else
{
// Correct leading nested List elements in the fragment
CorrectLeadingNestedLists((Section)fragment);
// Split a paragraph at insertion position
bool needFirstParagraphMerging = SplitParagraphForPasting(ref insertionPosition);
// Move the whole Section into the insertion point
fragment.RepositionWithContent(insertionPosition);
// Store edge positions of inserted content
fragmentStart = fragment.ElementStart;
fragmentEnd = fragment.ElementEnd.GetPositionAtOffset(0, LogicalDirection.Forward); // need forward orientation to stick with the following content during merge at fragmentStart position
// And unwrap the root Section
fragment.Reposition(null, null);
ValidateMergingPositions(typeof(Block), fragmentStart, fragmentEnd);
// Transfer inheritable contextual properties
ApplyContextualProperties(fragmentStart, fragmentEnd, fragment);
// Merge paragraphs on fragment boundaries
if (needFirstParagraphMerging)
{
MergeParagraphsAtPosition(fragmentStart, /*mergingOnFragmentStart:*/true);
}
// Get an indication that we need to merge last paragraph
if (!((Section)fragment).HasTrailingParagraphBreakOnPaste)
{
MergeParagraphsAtPosition(fragmentEnd, /*mergingOnFragmentStart:*/false);
}
}
//
// For paragraph pasting move range end to the following paragraph, because
// it must include an ending paragraph break (in case of no-merging)
if (fragment is Section && ((Section)fragment).HasTrailingParagraphBreakOnPaste)
{
fragmentEnd = fragmentEnd.GetInsertionPosition(LogicalDirection.Forward);
}
// Select pasted content
range.Select(fragmentStart, fragmentEnd);
}
/// <summary>
/// Inserts a TextElement at this TextPointer's position.
/// </summary>
/// <param name="textElement">
/// ContentElement to insert.
/// </param>
/// <remarks>
/// The LogicalDirection property specifies whether this TextPointer
/// will be positioned before or after the TextElement.
/// </remarks>
/// <exception cref="ArgumentException">
/// Throws ArgumentException is textElement is not valid
/// according to flow schema.
/// </exception>
/// <exception cref="InvalidOperationException">
/// Throws InvalidOperationException if textElement cannot be inserted
/// at this position because it belongs to another tree.
/// </exception>
internal void InsertTextElement(TextElement textElement)
{
Invariant.Assert(textElement != null);
_tree.EmptyDeadPositionList();
SyncToTreeGeneration();
ValidationHelper.ValidateChild(this, textElement, "textElement");
if (textElement.Parent != null)
{
throw new InvalidOperationException(SR.Get(SRID.TextPointer_CannotInsertTextElementBecauseItBelongsToAnotherTree));
}
textElement.RepositionWithContent(this);
}
