private int GetCharacterIndexAtPoint(Point point)
{
if (!_drawRect.Contains(point))
{
return(-1);
}
// Configure textContainer
var textContainer = new NSTextContainer();
textContainer.LineFragmentPadding = 0;
textContainer.LineBreakMode = LineBreakMode;
textContainer.MaximumNumberOfLines = (nuint)Lines;
textContainer.Size = _drawRect.Size;
// Configure layoutManager
var layoutManager = new NSLayoutManager();
layoutManager.AddTextContainer(textContainer);
// Configure textStorage
var textStorage = new NSTextStorage();
textStorage.SetString(AttributedText);
textStorage.AddLayoutManager(layoutManager);
textStorage.SetAttributes(
new UIStringAttributes()
{
Font = Font
},
new NSRange(0, textStorage.Length)
);
// Find the tapped character's index
var partialFraction = (nfloat)0;
var pointInTextContainer = new CGPoint(point.X - _drawRect.X, point.Y - _drawRect.Y);
var characterIndex = (int)layoutManager.CharacterIndexForPoint(pointInTextContainer, textContainer, ref partialFraction);
return(characterIndex);
}
void ResetAttributes(NSColor foregroundColorOverride = null)
{
// clear user attributes
TextStorage.SetAttributes(new NSDictionary(), new NSRange(0, TextStorage.Length));
var r = new NSRange(0, Text.Length);
TextStorage.SetString(new NSAttributedString(Text));
TextStorage.SetAlignment(TextAlignment.ToNSTextAlignment(), r);
if (Font != null)
{
// set a global font
TextStorage.AddAttribute(NSStringAttributeKey.Font, Font, r);
}
// paragraph style
TextContainer.LineBreakMode = TextTrimming == TextTrimming.WordElipsis ? NSLineBreakMode.TruncatingTail : NSLineBreakMode.ByWordWrapping;
var pstyle = NSParagraphStyle.DefaultParagraphStyle.MutableCopy() as NSMutableParagraphStyle;
pstyle.Alignment = TextAlignment.ToNSTextAlignment();
if (TextTrimming == TextTrimming.WordElipsis)
{
pstyle.LineBreakMode = NSLineBreakMode.TruncatingTail;
}
TextStorage.AddAttribute(NSStringAttributeKey.ParagraphStyle, pstyle, r);
// set foreground color override
if (foregroundColorOverride != null)
{
TextStorage.AddAttribute(NSStringAttributeKey.ForegroundColor, foregroundColorOverride, r);
}
// restore user attributes
foreach (var att in Attributes)
{
AddAttributeInternal(att);
}
}
