//--------------------------------------------------------------------
// Highlight compositing
//---------------------------------------------------------------------
private void _OnHighlightChanged(object sender, HighlightChangedEventArgs args)
{
Debug.Assert(sender != null);
Debug.Assert(args != null);
Debug.Assert(args.Ranges != null);
#if DEBUG
{
Highlights highlights = this.Highlights;
StaticTextPointer highlightTransitionPosition;
StaticTextPointer highlightRangeStart;
object selected;
DocumentsTrace.FixedDocumentSequence.Highlights.Trace("===BeginNewHighlightRange===");
highlightTransitionPosition = ((ITextContainer)this).CreateStaticPointerAtOffset(0);
while (true)
{
// Move to the next highlight start.
if (!highlights.IsContentHighlighted(highlightTransitionPosition, LogicalDirection.Forward))
{
highlightTransitionPosition = highlights.GetNextHighlightChangePosition(highlightTransitionPosition, LogicalDirection.Forward);
// No more highlights?
if (highlightTransitionPosition.IsNull)
{
break;
}
}
// highlightTransitionPosition is at the start of a new highlight run.
selected = highlights.GetHighlightValue(highlightTransitionPosition, LogicalDirection.Forward, typeof(TextSelection));
// Save the start position and find the end.
highlightRangeStart = highlightTransitionPosition;
highlightTransitionPosition = highlights.GetNextHighlightChangePosition(highlightTransitionPosition, LogicalDirection.Forward);
Invariant.Assert(!highlightTransitionPosition.IsNull, "Highlight start not followed by highlight end!");
// Store the highlight.
if (selected != DependencyProperty.UnsetValue)
{
DocumentsTrace.FixedDocumentSequence.Highlights.Trace(string.Format("HightlightRange {0}-{1}", highlightRangeStart.ToString(), highlightTransitionPosition.ToString()));
if (highlightRangeStart.GetPointerContext(LogicalDirection.Forward) != TextPointerContext.Text)
{
DocumentsTrace.FixedDocumentSequence.Highlights.Trace("<HighlightNotOnText>");
}
else
{
char[] sb = new char[256];
TextPointerBase.GetTextWithLimit(highlightRangeStart.CreateDynamicTextPointer(LogicalDirection.Forward), LogicalDirection.Forward, sb, 0, 256, highlightTransitionPosition.CreateDynamicTextPointer(LogicalDirection.Forward));
DocumentsTrace.FixedDocumentSequence.TextOM.Trace(string.Format("HightlightContent [{0}]", new String(sb)));
}
}
}
DocumentsTrace.FixedDocumentSequence.TextOM.Trace("===EndNewHighlightRange===");
}
#endif
Debug.Assert(args.Ranges.Count > 0 && ((TextSegment)args.Ranges[0]).Start.CompareTo(((TextSegment)args.Ranges[0]).End) < 0);
// For each change range we received, we need to figure out
// affected child TextContainer, and notify it with appropriate
// ranges that are in the child's address space.
//
// We only fire one highlight change notification for any child
// TextContainer even if there is multiple change ranges fall
// into the same child TextContainer.
//
// We scan the ranges and the child TextContainer in the same loop,
// moving forward two scanning pointers and at boundary of each
// TextContainer, we fire a change notification.
//
int idxScan = 0;
DocumentSequenceTextPointer tsScan = null;
ChildDocumentBlock cdbScan = null;
List <TextSegment> rangeArray = new List <TextSegment>(4);
while (idxScan < args.Ranges.Count)
{
TextSegment ts = (TextSegment)args.Ranges[idxScan];
DocumentSequenceTextPointer tsEnd = (DocumentSequenceTextPointer)ts.End;
ITextPointer tpChildStart, tpChildEnd;
ChildDocumentBlock lastBlock;
// If tsScan == null, we were done with previous range,
// so we are going to set tsScan to begining of this range.
// Otherwise the previous range was split so we will simply
// start from what was left over from previous loop.
if (tsScan == null)
{
tsScan = (DocumentSequenceTextPointer)ts.Start;
}
lastBlock = cdbScan;
cdbScan = tsScan.ChildBlock;
if (lastBlock != null && cdbScan != lastBlock && !(lastBlock.ChildContainer is NullTextContainer) && rangeArray.Count != 0)
{
// This range is in a different block, so take care of old blocks first
lastBlock.ChildHighlightLayer.RaiseHighlightChangedEvent(new ReadOnlyCollection <TextSegment>(rangeArray));
rangeArray.Clear();
}
tpChildStart = tsScan.ChildPointer;
if (tsEnd.ChildBlock != cdbScan)
{
// If this range crosses blocks, we are done with current block
tpChildEnd = tsScan.ChildPointer.TextContainer.End;
if (tpChildStart.CompareTo(tpChildEnd) != 0)
{
rangeArray.Add(new TextSegment(tpChildStart, tpChildEnd));
}
// Notify child container
if (!(cdbScan.ChildContainer is NullTextContainer) && rangeArray.Count != 0)
{
cdbScan.ChildHighlightLayer.RaiseHighlightChangedEvent(new ReadOnlyCollection <TextSegment>(rangeArray));
}
// Move on to next block;
cdbScan = cdbScan.NextBlock;
tsScan = new DocumentSequenceTextPointer(cdbScan, cdbScan.ChildContainer.Start);
rangeArray.Clear();
}
else
{
// Otherwise we need to go on to see if there is more ranges
// fall withing the same block. Simply add this change range
tpChildEnd = tsEnd.ChildPointer;
if (tpChildStart.CompareTo(tpChildEnd) != 0)
{
rangeArray.Add(new TextSegment(tpChildStart, tpChildEnd));
}
// Move on to next range
idxScan++;
tsScan = null;
}
}
// Fire change notification for the last child block.
if (rangeArray.Count > 0 && (!(cdbScan == null || cdbScan.ChildContainer is NullTextContainer)))
{
cdbScan.ChildHighlightLayer.RaiseHighlightChangedEvent(new ReadOnlyCollection <TextSegment>(rangeArray));
}
}