public TextSelection(int baseOffset, int extentOffset, TextAffinity affinity = TextAffinity.downstream,
bool isDirectional = false) : base(baseOffset < extentOffset ? baseOffset : extentOffset,
baseOffset < extentOffset ? extentOffset : baseOffset)
{
this.baseOffset = baseOffset;
this.extentOffset = extentOffset;
this.affinity = affinity;
this.isDirectional = isDirectional;
}
protected override InlineSpan getSpanForPositionVisitor(TextPosition position, Accumulator offset)
{
if (text == null)
{
return(null);
}
TextAffinity affinity = position.affinity;
int targetOffset = position.offset;
int endOffset = offset.value + text.Length;
if (offset.value == targetOffset && affinity == TextAffinity.downstream ||
offset.value < targetOffset && targetOffset < endOffset ||
endOffset == targetOffset && affinity == TextAffinity.upstream)
{
return(this);
}
offset.increment(text.Length);
return(null);
}
public TextPosition(int offset, TextAffinity affinity = TextAffinity.downstream) {
this.offset = offset;
this.affinity = affinity;
}
public static TextSelection collapsed(int offset, TextAffinity affinity = TextAffinity.downstream)
{
return(new TextSelection(offset, offset, affinity, false));
}
public PositionWithAffinity(int p, TextAffinity a)
{
this.position = p;
this.affinity = a;
}
