/// <summary>
/// Creates a text style run that has overrides applied. Only overrides with equal TextStyle.
/// If optimizeForShaping is <c>true</c> Foreground is ignored.
/// </summary>
/// <param name="text">The text to create the run for.</param>
/// <param name="defaultTextStyle">The default text style for segments that don't have an override.</param>
/// <param name="textStyleOverrides">The text style overrides.</param>
/// <returns>
/// The created text style run.
/// </returns>
private static TextStyleRun CreateTextStyleRunWithOverride(ReadOnlySlice <char> text,
TextStyle defaultTextStyle, IReadOnlyList <TextStyleRun> textStyleOverrides)
{
if (textStyleOverrides == null || textStyleOverrides.Count == 0)
{
return(new TextStyleRun(new TextPointer(text.Start, text.Length), defaultTextStyle));
}
var currentTextStyle = defaultTextStyle;
var hasOverride = false;
var i = 0;
var length = 0;
for (; i < textStyleOverrides.Count; i++)
{
var styleOverride = textStyleOverrides[i];
var textPointer = styleOverride.TextPointer;
if (textPointer.End < text.Start)
{
continue;
}
if (textPointer.Start > text.End)
{
length = text.Length;
break;
}
if (textPointer.Start > text.Start)
{
if (styleOverride.Style.TextFormat != currentTextStyle.TextFormat ||
!currentTextStyle.Foreground.Equals(styleOverride.Style.Foreground))
{
length = Math.Min(Math.Abs(textPointer.Start - text.Start), text.Length);
break;
}
}
length += Math.Min(text.Length - length, textPointer.Length);
if (hasOverride)
{
continue;
}
hasOverride = true;
currentTextStyle = styleOverride.Style;
}
if (length < text.Length && i == textStyleOverrides.Count)
{
if (currentTextStyle.Foreground.Equals(defaultTextStyle.Foreground) &&
currentTextStyle.TextFormat == defaultTextStyle.TextFormat)
{
length = text.Length;
}
}
if (length != text.Length)
{
text = text.Take(length);
}
return(new TextStyleRun(new TextPointer(text.Start, length), currentTextStyle));
}
public ShapedTextRun(ReadOnlySlice <char> text, TextStyle style) : this(
TextShaper.Current.ShapeText(text, style.TextFormat), style)
{
}
public ShapedTextRun(GlyphRun glyphRun, TextStyle style)
{
Text = glyphRun.Characters;
Style = style;
GlyphRun = glyphRun;
}
public TextCharacters(ReadOnlySlice <char> text, TextStyle style)
{
Text = text;
Style = style;
}
