private RectangleF[] MeasureStringParts(CharacterRange[] range, Graphics g, string str, Style style)
{
UpdateTabStop(str, style);
stringFormat.SetMeasurableCharacterRanges(range);
Region[] regn = g.MeasureCharacterRanges(str, FontCache.get(style),
RectangleF.Empty, stringFormat);
return(Array.ConvertAll(regn, rgn => rgn.GetBounds(g)));
}
private void UpdateTabStop(string str, Style style)
{
var tabCount = countTabs(str);
if (tabCount <= 0)
{
return;
}
var tabString = new string(' ', ViewStyle.TabSize);
var tabSize = surface.Graphics.MeasureString(tabString, FontCache.get(style), 0, stringFormat);
stringFormat.SetTabStops(0, new[] { tabSize.Width });
}
private RectangleF DrawStringPart(CharacterRange range, Graphics g, string str, Style style, float offset)
{
string part = str.Substring(range.First, range.Length);
UpdateTabStop(part, style);
RectangleF size = MeasureStringPart(range, g, str, style);
if (!style.Background.IsEmpty)
{
RectangleF textRect = size;
textRect.X = 0;
textRect.Offset(offset, 0);
g.FillRectangle(BrushCache.getSolid(style.Background), textRect);
}
g.DrawString(part, FontCache.get(style), BrushCache.getForeground(style), offset, 0, stringFormat);
return(size);
}