private float MeasureLineHeight(LineSpan line)
{
float height = 0.0F;
foreach (var span in line.TextSpans)
{
styleStack.PushStyle(span.Style);
var font = styleStack.GetFont(defaultFont);
height = Math.Max(
height,
font.Height + styleStack.GetNumber(s => s.PaddingTop) +
styleStack.GetNumber(s => s.PaddingBottom));
styleStack.PopStyle();
}
return(height);
}
private RectangleF CharPositionToClient(Graphics g, TextPointer pos, LayoutSpan span, StyleStack styleStack)
{
var iChar = pos.Character;
styleStack.PushStyle(span.Style);
var font = styleStack.GetFont(defaultFont);
var textStub = span.Text.Substring(0, iChar);
var sz = MeasureText(g, textStub, font);
var x = sz.Width + span.ContentExtent.Left;
var width = 1;
styleStack.PopStyle();
return(new RectangleF(x, span.ContentExtent.Top, width, span.ContentExtent.Height));
}
private int GetCharPosition(Graphics g, Point ptClient, LayoutSpan span, StyleStack styleStack)
{
var x = ptClient.X - span.ContentExtent.Left;
var textStub = span.Text;
int iLow = 0;
int iHigh = textStub.Length;
styleStack.PushStyle(span.Style);
var font = styleStack.GetFont(defaultFont);
var sz = MeasureText(g, textStub, font);
float xLow = 0;
float xHigh = sz.Width;
while (iLow < iHigh - 1)
{
int iMid = iLow + (iHigh - iLow) / 2;
textStub = span.Text.Substring(0, iMid);
sz = MeasureText(g, textStub, font);
if (x < sz.Width)
{
iHigh = iMid;
xHigh = sz.Width;
}
else
{
iLow = iMid;
xLow = sz.Width;
}
}
styleStack.PopStyle();
var cx = xHigh - xLow;
if (x - xLow > cx)
{
return(iHigh);
}
else
{
return(iLow);
}
}
private void PaintLine(LayoutLine line)
{
this.line = line;
// Paint the last piece of the line
RectangleF rcTrailer = line.Extent;
float xMax = 0;
if (line.Spans.Length > 0)
{
xMax = line.Spans[line.Spans.Length - 1].ContentExtent.Right;
}
var cx = extent.Width - xMax;
if (cx > 0)
{
rcTrailer.X = xMax;
rcTrailer.Width = cx;
graphics.FillRectangle(
styleStack.GetBackground(defaultBgColor),
rcTrailer);
}
for (int iSpan = 0; iSpan < line.Spans.Length; ++iSpan)
{
this.span = line.Spans[iSpan];
this.styleStack.PushStyle(span.Style);
var pos = new TextPointer(line.Position, iSpan, 0);
var insideSelection =
outer.ComparePositions(selStart, pos) <= 0 &&
outer.ComparePositions(pos, selEnd) < 0;
this.fg = styleStack.GetForegroundColor(defaultFgColor);
this.bg = styleStack.GetBackground(defaultBgColor);
this.font = styleStack.GetFont(defaultFont);
this.rcContent = span.ContentExtent;
this.rcTotal = span.PaddedExtent;
if (!insideSelection)
{
if (selStart.Line == line.Position && selStart.Span == iSpan)
{
// Selection starts inside the current span. Write
// any unselected text first.
if (selStart.Character > 0)
{
DrawTextSegment(0, selStart.Character, false);
}
if (selEnd.Line == line.Position && selEnd.Span == iSpan)
{
// Selection ends inside the current span. Write
// selected text.
DrawTextSegment(selStart.Character, selEnd.Character - selStart.Character, true);
DrawTrailingTextSegment(selEnd.Character, false);
}
else
{
// Select all the way to the end of the span.
DrawTrailingTextSegment(selStart.Character, true);
}
}
else
{
// Not in selection at all.
DrawText(span.Text, false);
}
}
else
{
// Inside selection. Does it end?
if (selEnd.Line == line.Position && selEnd.Span == iSpan)
{
// Selection ends inside the current span. Write
// selected text.
DrawTextSegment(0, selEnd.Character, true);
DrawTrailingTextSegment(selEnd.Character, false);
}
else
{
DrawText(span.Text, true);
}
}
#if DEBUG
var text = span.Text;
if (line.Position == selStart.Line &&
iSpan == selStart.Span)
{
var textFrag = text.Substring(0, selStart.Character);
var sz = outer.MeasureText(graphics, textFrag, font);
graphics.FillRectangle(
Brushes.Red,
span.ContentExtent.Left + sz.Width, line.Extent.Top,
1, line.Extent.Height);
}
if (line.Position == selEnd.Line &&
iSpan == selEnd.Span)
{
var textFrag = text.Substring(0, selEnd.Character);
var sz = outer.MeasureText(graphics, textFrag, font);
graphics.FillRectangle(
Brushes.Blue,
span.ContentExtent.Left + sz.Width, line.Extent.Top,
1, line.Extent.Height);
}
#endif
styleStack.PopStyle();
}
}