internal PhysicalLineInfo(TextRange lineRange)
{
if (lineRange == null)
{
throw new ArgumentNullException("lineRange");
}
TextPointerOperations.DebugAssertIsSingleLine(lineRange);
var charPositions = TextPointerOperations.GetInsertionPositions(lineRange, LogicalDirection.Forward);
var charPositionPairs = PrevNext <TextPointer> .AsPrevNext(charPositions);
this.charHitTestInfo = from pair in charPositionPairs
select new PhysicalCharInfo(pair.Prev, pair.Next);
}
internal static IEnumerable <Rect> GetHighlightRects(TextRange range, IContentHost contentHost)
{
#if USE_APPROXIMATE_HIGHLIGHT_RECT
return(TextPointerOperations.GetHighlightRectanglesWithContentHost(
range,
TextPointerOperations.GetApproximateHighlightRectangles,
contentHost
));
#else
return(TextPointerOperations.GetHighlightRectanglesWithContentHost(
range,
TextPointerOperations.GetHighlightRectangles,
contentHost
));
#endif
}
private static IEnumerable <Rect> GetHighlightRectangleFromLines(
TextRange range,
Func <TextRange, IEnumerable <Rect> > getHilightRectFromLineRange
)
{
Assert.IsNotNull(range);
Assert.IsNotNull(getHilightRectFromLineRange);
IEnumerable <Rect[]> rectsPerLine =
from lineRange in TextPointerOperations.GetLineRanges(range)
select getHilightRectFromLineRange(lineRange).ToArray();
Rect[][] rectsPerLineArray = rectsPerLine.ToArray();
AlignLineTops(rectsPerLineArray);
return(MergeConsecutiveAdjacentRects(rectsPerLineArray.SelectMany(x => x)));
}
/// <remarks>
/// Can be quite slow for very, very long lines of text
/// </remarks>
private static TextPointer GetPositionFromPointByLinearScan(Point point, TextRange range, bool snapToText)
{
PhysicalCharInfo result = null;
var lineInfos = TextPointerOperations.GetPhysicalLines(range).ToArray();
switch (lineInfos.Length)
{
case 0:
{
result = snapToText ? new PhysicalCharInfo(range.Start) : null;
break;
}
case 1:
{
result = TopToBottomLineHitTest(lineInfos.First(), point, snapToText, range.Start);
break;
}
default:
{
// Optimization, scan the last line to quickly determine if the point is below the bottom line
result = BottomToTopLineHitTest(lineInfos.Last(), point, snapToText, range.End);
if (result == null)
{
// scan lines from top to bottom
var fwdLineResults = from lineInfo in lineInfos.Take(lineInfos.Length - 1)
select TopToBottomLineHitTest(lineInfo, point, snapToText, range.Start);
result = fwdLineResults.FirstOrDefault(x => x != null);
}
break;
}
}
Assert.Implies(snapToText, result != null);
return((result != null) ? result.NearPosition : null);
}