public TextPosition getParagraphBackward(TextPosition position, TextAffinity?affinity = null)
{
var lineCount = this._textPainter.getLineCount();
Paragraph.LineRange line = null;
for (int i = lineCount - 1; i >= 0; --i)
{
line = this._textPainter.getLineRange(i);
if (i != 0 && !this._textPainter.getLineRange(i - 1).hardBreak)
{
continue;
}
if (line.start < position.offset)
{
break;
}
}
if (line == null)
{
return(new TextPosition(position.offset, affinity ?? position.affinity));
}
return(new TextPosition(line.start, affinity ?? position.affinity));
}
public TextPosition getParagraphForward(TextPosition position, TextAffinity?affinity = null)
{
var lineCount = this._textPainter.getLineCount();
Paragraph.LineRange line = null;
for (int i = 0; i < lineCount; ++i)
{
line = this._textPainter.getLineRange(i);
if (!line.hardBreak)
{
continue;
}
if (line.end > position.offset)
{
break;
}
}
if (line == null)
{
return(new TextPosition(position.offset, affinity ?? position.affinity));
}
return(new TextPosition(line.end, affinity ?? position.affinity));
}
