public override object Create()
{
var tl = new DroidTextLayoutBackend();
return(tl);
}
public void Wrap(DroidTextLayoutBackend layout, AG.Paint paint)
{
var text = layout.Text;
var metrics = paint.GetFontMetrics();
Baseline = -metrics.Top;
LineHeight = -metrics.Ascent + metrics.Descent;
LineY = -metrics.Ascent; //- (metrics.Ascent + metrics.Descent);
var charWidths = new float[text.Length];
paint.GetTextWidths(text, charWidths);
var iLf = text.IndexOfAny(new char[] { '\n', '\r' });
HasLineFeed = iLf >= 0;
var textWidth = charWidths.Sum();
if (!HasLineFeed && (layout.Height <= 0 || layout.Height <= LineHeight) && (layout.Width <= 0 || textWidth <= layout.Width))
{
LineWidth = textWidth;
SingleLine(this);
}
else
{
MaxHeight = PreferedSize.Height > 0 ? PreferedSize.Height : (layout.Height <= 0 ? float.MaxValue : layout.Height);
MaxWidth = PreferedSize.Width > 0 ? PreferedSize.Width : (layout.Width <= 0 ? textWidth : layout.Width);
CursorPos = 0;
LineStart = 0;
while (LineY <= MaxHeight && CursorPos < text.Length)
{
LineWidth = 0f;
var whitePosY = -1f;
var whitepos = -1;
var newLine = false;
while (CursorPos < text.Length)
{
newLine = text [CursorPos] == '\n';
if (text [CursorPos] == '\r')
{
CursorPos++;
continue;
}
if (newLine)
{
break;
}
if (char.IsWhiteSpace(text [CursorPos]))
{
whitepos = CursorPos;
whitePosY = LineWidth;
}
LineWidth += charWidths [CursorPos];
if (LineWidth > MaxWidth)
{
if (whitepos > 0)
{
CursorPos = whitepos;
LineWidth = whitePosY;
}
break;
}
CursorPos++;
}
Action line = () => {
MultiLine(this);
LineY += LineHeight;
};
line();
CursorPos++;
LineStart = CursorPos;
if (newLine && CursorPos == text.Length)
{
line();
}
}
}
}
