/// <summary>
/// Constructs a <code>LineBreakMeasurer</code> for the specified text.
/// </summary>
/// <param name="text"> the text for which this <code>LineBreakMeasurer</code>
/// produces <code>TextLayout</code> objects; the text must contain
/// at least one character; if the text available through
/// <code>iter</code> changes, further calls to this
/// <code>LineBreakMeasurer</code> instance are undefined (except,
/// in some cases, when <code>insertChar</code> or
/// <code>deleteChar</code> are invoked afterward - see below) </param>
/// <param name="breakIter"> the <seealso cref="BreakIterator"/> which defines line
/// breaks </param>
/// <param name="frc"> contains information about a graphics device which is
/// needed to measure the text correctly;
/// text measurements can vary slightly depending on the
/// device resolution, and attributes such as antialiasing; this
/// parameter does not specify a translation between the
/// <code>LineBreakMeasurer</code> and user space </param>
/// <exception cref="IllegalArgumentException"> if the text has less than one character </exception>
/// <seealso cref= LineBreakMeasurer#insertChar </seealso>
/// <seealso cref= LineBreakMeasurer#deleteChar </seealso>
public LineBreakMeasurer(AttributedCharacterIterator text, BreakIterator breakIter, FontRenderContext frc)
{
if (text.EndIndex - text.BeginIndex < 1)
{
throw new IllegalArgumentException("Text must contain at least one character.");
}
this.BreakIter = breakIter;
this.Measurer = new TextMeasurer(text, frc);
this.Limit = text.EndIndex;
this.Pos = this.Start = text.BeginIndex;
CharIter = new CharArrayIterator(Measurer.Chars, this.Start);
this.BreakIter.SetText(CharIter);
}
internal LineLayout NextLine()
{
if (_currentPos < _currentRun && !Format.NoWrap)
{
return(NextTextLayoutFromMeasurer());
}
_charsConsumed += _currentRun;
if (_charsConsumed >= _s.Length)
{
return(null);
}
string s;
int lineBreakIndex = _s.IndexOf(NewLine, _charsConsumed);
if (lineBreakIndex >= 0)
{
s = _s.Substring(_charsConsumed, lineBreakIndex - _charsConsumed + NewLine.Length);
}
else
{
s = _s.Substring(_charsConsumed);
}
_currentRun = s.Length;
_currentPos = 0;
text.AttributedString aS = new text.AttributedString(s);
// TODO: add more attribs according to StringFormat
aS.addAttribute(font.TextAttribute.FONT, _font.NativeObject);
if ((_font.Style & FontStyle.Underline) != FontStyle.Regular)
{
aS.addAttribute(font.TextAttribute.UNDERLINE, font.TextAttribute.UNDERLINE_ON);
}
if ((_font.Style & FontStyle.Strikeout) != FontStyle.Regular)
{
aS.addAttribute(font.TextAttribute.STRIKETHROUGH, font.TextAttribute.STRIKETHROUGH_ON);
}
text.AttributedCharacterIterator charIter = aS.getIterator();
_measurer = new font.TextMeasurer(charIter, _frc);
return(NextTextLayoutFromMeasurer());
}
internal LineLayout NextLine() {
if (_currentPos < _currentRun && !Format.NoWrap)
return NextTextLayoutFromMeasurer();
_charsConsumed += _currentRun;
if (_charsConsumed >= _s.Length)
return null;
string s;
int lineBreakIndex = _s.IndexOf(NewLine, _charsConsumed);
if (lineBreakIndex >= 0) {
s = _s.Substring(_charsConsumed, lineBreakIndex - _charsConsumed + NewLine.Length);
}
else
s = _s.Substring(_charsConsumed);
_currentRun = s.Length;
_currentPos = 0;
text.AttributedString aS = new text.AttributedString(s);
// TODO: add more attribs according to StringFormat
aS.addAttribute(font.TextAttribute.FONT, _font.NativeObject);
if((_font.Style & FontStyle.Underline) != FontStyle.Regular)
aS.addAttribute(font.TextAttribute.UNDERLINE, font.TextAttribute.UNDERLINE_ON);
if((_font.Style & FontStyle.Strikeout) != FontStyle.Regular)
aS.addAttribute(font.TextAttribute.STRIKETHROUGH, font.TextAttribute.STRIKETHROUGH_ON);
text.AttributedCharacterIterator charIter = aS.getIterator();
_measurer = new font.TextMeasurer(charIter, _frc);
return NextTextLayoutFromMeasurer();
}