private void GetLspanFor(int pos, out RichTextBoxLayoutSpan lspan, out int lspanIndex, out int charIndexInLspan)
{
var nextLspanIndex = Enumerable.Range(0, LayoutSpans.Count).Where(x => pos < LayoutSpans[x].TextAbsPosition).FirstOrNull() ?? LayoutSpans.Count;
lspanIndex = nextLspanIndex - 1;
lspan = LayoutSpans[lspanIndex];
charIndexInLspan = pos - lspan.TextAbsPosition;
}
private bool TryGetClosestSpanAt(Vector2 point, out RichTextBoxLayoutSpan lspan)
{
if (LayoutSpans.Count == 0)
{
lspan = default(RichTextBoxLayoutSpan);
return(false);
}
lspan = LayoutSpans.Minimal(x => x.DistanceFrom(point));
return(true);
}
private void FlushStrip(BuildingContext context, int paragraphIndex, float tabOffset, SubList <Subspan> subspans, bool isFirstStrip, bool isLastStrip)
{
// todo: consider direction
var paragraph = context.Text.Paragraphs[paragraphIndex];
//if (!isLastStrip)
// subspans = TrimEnd(subspans);
var commonSize = MeasureSubspans(context, subspans);
var stripSize = new Size2(context.RemainingShape.Width, commonSize.Height);
if (paragraph.Style.Alignment != RtParagraphAlignment.Justify || isLastStrip)
{
// todo: tabs
var mergedSubspans = MergeSubspans(subspans);
var newRectangles = new RichTextBoxLayoutSpan[mergedSubspans.Count];
var strip = AaRectangle2.FromCornerAndDimensions(
context.StripStartPoint.X, context.StripStartPoint.Y,
commonSize.Width, commonSize.Height);
var rectOffsetX = context.StripStartPoint.X + tabOffset;
var charIndex = 0;
for (var i = 0; i < mergedSubspans.Count; i++)
{
var subspan = mergedSubspans[i];
var subspanSize = MeasureSubspan(subspan);
var charWidths = subspan.Text.Select(x => measurer.GetCharSize(x, subspan.Style).Width).ToArray();
var subspanWidthWithoutKerning = charWidths.Sum();
var kerningAdjustment = subspanSize.Width / subspanWidthWithoutKerning;
var adjustedCharWidths = charWidths.Select(x => x * kerningAdjustment).ToArray();
var charOffsets = Enumerable.Range(0, subspan.Text.Length).Select(x => adjustedCharWidths.Take(x).Sum()).ToArray();
newRectangles[i] = new RichTextBoxLayoutSpan
{
TextRelPosition = subspan.TextRelPosition,
TextAbsPosition = context.Text.GetGlobalIndex(subspan.TextRelPosition),
Bounds = new AaRectangle2(
new Vector2(rectOffsetX, context.StripStartPoint.Y),
new Vector2(rectOffsetX + subspanSize.Width, context.StripStartPoint.Y + commonSize.Height)),
Strip = strip,
CharOffsets = charOffsets,
Text = subspan.Text,
Style = subspan.Style,
Embedding = subspan.Embedding,
EmbeddingHandler = subspan.EmbeddingHandler,
EmbeddingImage = subspan.EmbeddingImage
};
rectOffsetX += subspanSize.Width;
charIndex += subspan.Text.Length;
}
var adjustment = 0f;
switch (paragraph.Style.Alignment)
{
case RtParagraphAlignment.Left:
break;
case RtParagraphAlignment.Center:
var leftCenterX = rectOffsetX / 2;
var stripCenter = stripSize.Width / 2;
adjustment = stripCenter - leftCenterX;
break;
case RtParagraphAlignment.Right:
adjustment = stripSize.Width - rectOffsetX;
break;
case RtParagraphAlignment.Justify:
default:
throw new ArgumentOutOfRangeException();
}
for (var i = 0; i < newRectangles.Length; i++)
{
newRectangles[i].Bounds.Center.X += adjustment;
}
context.LayoutSpans.AddRange(newRectangles);
context.RemainingShape = new AaRectangle2(context.RemainingShape.MinMin + Vector2.UnitY * stripSize.Height,
context.RemainingShape.MaxMax);
if (isFirstStrip)
{
// todo: adjust for other directions
var bulletStr = paragraph.Style.ListStyle.GetIconFor(paragraph.Style.TabCount, /*todo*/ 0);
FlushBullet(context, new Vector2(tabOffset, strip.MaxY), bulletStr, subspans.First().Style);
}
}
else
{
throw new NotImplementedException();
}
}
private static int GetPositionInLspan(Vector2 point, RichTextBoxLayoutSpan lspan)
{
return(lspan.TextAbsPosition + lspan.ClosestIndexFor(point.X));
}
public bool TryGetSpanAt(Vector2 point, out RichTextBoxLayoutSpan lspan)
{
return(TryGetClosestSpanAt(point, out lspan) && lspan.Bounds.ContainsPoint(point));
}
