private string DetectTappedUrl(UIGestureRecognizer tap, UILabel label, IEnumerable <LinkData> linkList)
{
// Create instances of NSLayoutManager, NSTextContainer and NSTextStorage
var layoutManager = new NSLayoutManager();
var textContainer = new NSTextContainer();
var textStorage = new NSTextStorage();
textStorage.SetString(label.AttributedText);
// Configure layoutManager and textStorage
layoutManager.AddTextContainer(textContainer);
textStorage.AddLayoutManager(layoutManager);
// Configure textContainer
textContainer.LineFragmentPadding = 0;
textContainer.LineBreakMode = label.LineBreakMode;
textContainer.MaximumNumberOfLines = (nuint)label.Lines;
var labelSize = label.Bounds.Size;
textContainer.Size = labelSize;
// Find the tapped character location and compare it to the specified range
var locationOfTouchInLabel = tap.LocationInView(label);
var textBoundingBox = layoutManager.GetUsedRectForTextContainer(textContainer);
var textContainerOffset = new CGPoint((labelSize.Width - textBoundingBox.Size.Width) * 0.0 - textBoundingBox.Location.X,
(labelSize.Height - textBoundingBox.Size.Height) * 0.0 - textBoundingBox.Location.Y);
nfloat labelX;
switch (Element.HorizontalTextAlignment)
{
case TextAlignment.End:
labelX = locationOfTouchInLabel.X - (labelSize.Width - textBoundingBox.Size.Width);
break;
case TextAlignment.Center:
labelX = locationOfTouchInLabel.X - (labelSize.Width - textBoundingBox.Size.Width) / 2;
break;
default:
labelX = locationOfTouchInLabel.X;
break;
}
var locationOfTouchInTextContainer = new CGPoint(labelX - textContainerOffset.X, locationOfTouchInLabel.Y - textContainerOffset.Y);
nfloat partialFraction = 0;
var indexOfCharacter = (nint)layoutManager.CharacterIndexForPoint(locationOfTouchInTextContainer, textContainer, ref partialFraction);
foreach (var link in linkList)
{
// Xamarin version of NSLocationInRange?
if ((indexOfCharacter >= link.Range.Location) && (indexOfCharacter < link.Range.Location + link.Range.Length))
{
return(link.Url);
}
}
return(null);
}
// NOTE: this method only works with single line UILabels, or multi-line labels with left aligned text
// Potential fix found on timbroder's comment on https://stackoverflow.com/questions/1256887/create-tap-able-links-in-the-nsattributedstring-of-a-uilabel
// Based on https://stackoverflow.com/questions/1256887/create-tap-able-links-in-the-nsattributedstring-of-a-uilabel
// Based on https://samwize.com/2016/03/04/how-to-create-multiple-tappable-links-in-a-uilabel/
/// <summary>
/// Determines whether the tap is within the NSRange targetRange. Returns true if so, otherwise returns false.
/// </summary>
/// <returns><c>true</c>, if tap was within the targetRange of the label, <c>false</c> otherwise.</returns>
/// <param name="label">The label containing the text.</param>
/// <param name="targetRange">The target range of the tappable text within the label.</param>
/// <param name="gestureRecognizer">Gesture recognizer.</param>
/// <param name="textAlignment">Text alignment of the label.</param>
public static bool DidTapAttributedTextInLabel(UILabel label, NSRange targetRange, UIGestureRecognizer gestureRecognizer, UITextAlignment textAlignment)
{
NSLayoutManager layoutManager = new NSLayoutManager();
NSTextContainer textContainer = new NSTextContainer(CGSize.Empty);
NSTextStorage textStorage = new NSTextStorage();
textStorage.SetString(label.AttributedText);
// Configure layoutManager and textStorage
layoutManager.AddTextContainer(textContainer);
textStorage.AddLayoutManager(layoutManager);
// Configure textContainer
textContainer.LineFragmentPadding = 0.0f;
textContainer.LineBreakMode = label.LineBreakMode;
textContainer.MaximumNumberOfLines = (System.nuint)label.Lines;
CGSize labelSize = label.Bounds.Size;
textContainer.Size = labelSize;
// Find the tapped character location and compare it to the specified range
CGPoint locationOfTouchInLabel = gestureRecognizer.LocationInView(label);
CGRect textBoundingBox = layoutManager.GetUsedRectForTextContainer(textContainer);
// Change based on the UITextAlignment enum
float multiplier;
if (textAlignment == UITextAlignment.Center)
{
multiplier = 0.5f;
}
else if (textAlignment == UITextAlignment.Right)
{
multiplier = 1.0f;
}
else
{
// textAlignment is Left, Natural, or Justified
multiplier = 0.0f;
}
CGPoint textContainerOffset = new CGPoint(
((labelSize.Width - textBoundingBox.Size.Width) * multiplier - textBoundingBox.Location.X),
((labelSize.Height - textBoundingBox.Size.Height) * multiplier - textBoundingBox.Location.Y)
);
CGPoint locationOfTouchInTextContainer = new CGPoint(locationOfTouchInLabel.X - textContainerOffset.X, locationOfTouchInLabel.Y - textContainerOffset.Y);
nfloat partialFraction = 0;
int indexOfCharacter = (int)layoutManager.CharacterIndexForPoint(locationOfTouchInTextContainer, textContainer, ref partialFraction);
// Xamarin version of the function NSLocationInRange (Swift equivalent is to call ```NSLocationInRange(indexOfCharacter, targetRange);``` )
// Credit to https://forums.xamarin.com/discussion/56484/need-to-put-html-into-a-label
bool isInRange = (indexOfCharacter >= targetRange.Location) && (indexOfCharacter <= targetRange.Location + targetRange.Length);
return(isInRange);
}
int IndexAtPoint(Point point)
{
var cgPoint = new CGPoint(point.X, point.Y - Control.Frame.Y);
// init text storage
var textStorage = new NSTextStorage();
//if (Control.AttributedText != null)
var attrText = new NSAttributedString(Control.AttributedText);
textStorage.SetString(attrText);
/*
* else
* {
* var attrString = new NSMutableAttributedString(Control.Text);
* attrString.AddAttribute(UIStringAttributeKey.Font, Control.Font, new NSRange(0, Control.Text.Length));
* textStorage.SetString(attrString);
* }
*/
// init layout manager
var layoutManager = new NSLayoutManager();
textStorage.AddLayoutManager(layoutManager);
// init text container
var textContainer = new NSTextContainer(new CGSize(Control.Frame.Width, Control.Frame.Height * 2));
textContainer.LineFragmentPadding = 0;
textContainer.MaximumNumberOfLines = (nuint)ControlLines;
textContainer.LineBreakMode = UILineBreakMode.WordWrap;//Control.LineBreakMode;
//if (Control.LineBreakMode == UILineBreakMode.TailTruncation || Control.LineBreakMode == UILineBreakMode.HeadTruncation || Control.LineBreakMode == UILineBreakMode.MiddleTruncation)
// textContainer.LineBreakMode = UILineBreakMode.WordWrap;
textContainer.Size = new CGSize(Control.Frame.Width, Control.Frame.Height * 2);
layoutManager.AddTextContainer(textContainer);
layoutManager.AllowsNonContiguousLayout = true;
//layoutManager.SetTextContainer(textContainer,new NSRange(0,Control.AttributedText.Length));
//layoutManager.UsesFontLeading = true;
//layoutManager.EnsureLayoutForCharacterRange(new NSRange(0,Control.AttributedText.Length));
//layoutManager.EnsureLayoutForTextContainer(textContainer);
nfloat partialFraction = 0;
var characterIndex = layoutManager.CharacterIndexForPoint(cgPoint, textContainer, ref partialFraction);
//[self.layoutManager drawGlyphsForGlyphRange:NSMakeRange(0, self.textStorage.length) atPoint:CGPointMake(0, 0)];
//layoutManager.DrawGlyphs(new NSRange(0,Control.AttributedText.Length),Control.Frame.Location);
return((int)characterIndex);
}
private int GetCharacterIndexAtPoint(Point point)
{
if (!_drawRect.Contains(point))
{
return(-1);
}
// 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, _layoutManager.TextContainers.FirstOrDefault(), ref partialFraction);
return(characterIndex);
}
void LabelTapped(UITapGestureRecognizer gestureRecognizer)
{
var locationOfTouch = gestureRecognizer.LocationInView(gestureRecognizer.View);
nfloat f = 0;
var indexOfCharacter = _layoutManager.CharacterIndexForPoint(locationOfTouch, _textContainer, ref f);
_styledTextPartList.ForEach(part =>
{
if (Convert.ToInt32(indexOfCharacter) >= part.Key && Convert.ToInt32(indexOfCharacter) < part.Key + part.Value.Text.Length - 1)
{
part.Value.Command?.Execute(part.Value.CommandParameter);
}
});
}
public nuint GetIndexFromCoordinates(double x, double y)
{
using (var TextLayout = new NSLayoutManager())
{
TextLayout.AddTextContainer(TextContainer);
TextStorage.AddLayoutManager(TextLayout);
TextLayout.GlyphRangeForBoundingRect(new CGRect(CGPoint.Empty, TextContainer.Size), TextContainer);
nfloat fraction = 0;
var index = TextLayout.CharacterIndexForPoint(new CGPoint(x, y), TextContainer, ref fraction);
TextStorage.RemoveLayoutManager(TextLayout);
TextLayout.RemoveTextContainer(0);
return(index);
}
}
private int GetCharacterIndexAtPoint(Point point)
{
if (!_drawRect.Contains(point))
{
return(-1);
}
// Find the tapped character's index
var partialFraction = (nfloat)0;
var pointInTextContainer = new CGPoint(point.X - _drawRect.X, point.Y - _drawRect.Y);
#pragma warning disable CS0618 // Type or member is obsolete (For VS2017 compatibility)
var characterIndex = (int)_layoutManager.CharacterIndexForPoint(pointInTextContainer, _layoutManager.TextContainers.FirstOrDefault(), ref partialFraction);
#pragma warning restore CS0618 // Type or member is obsolete
return(characterIndex);
}
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);
}
private NSRange?AttributedTextRangeForPoint(CGPoint point)
{
var layoutManager = new NSLayoutManager();
var textContainer = new NSTextContainer(CGSize.Empty)
{
LineFragmentPadding = 0.0f,
LineBreakMode = LineBreakMode,
MaximumNumberOfLines = (nuint)Lines,
Size = Bounds.Size
};
layoutManager.AddTextContainer(textContainer);
var textStorage = new NSTextStorage();
textStorage.SetString(AttributedText);
textStorage.AddLayoutManager(layoutManager);
var textBoundingBox = layoutManager.GetUsedRectForTextContainer(textContainer);
var textContainerOffset = new CGPoint(
(Bounds.Width - textBoundingBox.Width) * 0.5f - textBoundingBox.GetMinX(),
(Bounds.Height - textBoundingBox.Height) * 0.5f - textBoundingBox.GetMinY());
var locationOfTouchInTextContainer = new CGPoint(point.X - textContainerOffset.X,
point.Y - textContainerOffset.Y);
var frac = new nfloat(0.0f);
var indexOfCharacter = layoutManager.CharacterIndexForPoint(locationOfTouchInTextContainer,
textContainer, ref frac);
foreach (var pair in _handlerDictionary)
{
var range = pair.Key;
if (range.LocationInRange((int)indexOfCharacter))
{
return(range);
}
}
return(null);
}
bool didTapAttributedTextInLabel(UITapGestureRecognizer tap, UILabel label, NSRange targetRange)
{
var layoutManager = new NSLayoutManager();
var textContainer = new NSTextContainer(CGSize.Empty);
var textStorage = new NSTextStorage();
textStorage.SetString(label.AttributedText);
layoutManager.AddTextContainer(textContainer);
textStorage.AddLayoutManager(layoutManager);
textContainer.LineFragmentPadding = 0;
textContainer.LineBreakMode = label.LineBreakMode;
textContainer.MaximumNumberOfLines = (nuint)label.Lines;
var labelSize = label.Bounds.Size;
textContainer.Size = labelSize;
var locationOfTouchInLabel = tap.LocationInView(label);
var textBoundingBox = layoutManager.GetUsedRectForTextContainer(textContainer);
var textContainerOffset = new CGPoint((labelSize.Width - textBoundingBox.Size.Width) * 0.5 - textBoundingBox.Location.X,
(labelSize.Height - textBoundingBox.Size.Height) * 0.5 - textBoundingBox.Location.Y);
var locationOfTouchInTextContainer = new CGPoint(locationOfTouchInLabel.X - textContainerOffset.X,
locationOfTouchInLabel.Y - textContainerOffset.Y);
nfloat partialFraction = 1;
var indexOfCharacter = layoutManager.CharacterIndexForPoint(locationOfTouchInTextContainer, textContainer, ref partialFraction);
if (((nint)indexOfCharacter >= targetRange.Location) && ((nint)indexOfCharacter < targetRange.Location + targetRange.Length))
{
return(true);
}
return(false);
}
private string DetectTappedUrl(UIGestureRecognizer tap, UILabel label, IEnumerable <LinkData> linkList)
{
// Creates instances of NSLayoutManager, NSTextContainer and NSTextStorage
var layoutManager = new NSLayoutManager();
var textContainer = new NSTextContainer();
var textStorage = new NSTextStorage();
textStorage.SetString(label.AttributedText);
// Configures layoutManager and textStorage
layoutManager.AddTextContainer(textContainer);
textStorage.AddLayoutManager(layoutManager);
// Configures textContainer
textContainer.LineFragmentPadding = 0;
textContainer.LineBreakMode = label.LineBreakMode;
textContainer.MaximumNumberOfLines = (nuint)label.Lines;
var labelSize = label.Bounds.Size;
textContainer.Size = labelSize;
// Finds the tapped character location and compare it to the specified range
var locationOfTouchInLabel = tap.LocationInView(label);
var textBoundingBox = layoutManager.GetUsedRectForTextContainer(textContainer);
var textContainerOffset = new CGPoint((labelSize.Width - textBoundingBox.Size.Width) * 0.0 - textBoundingBox.Location.X,
(labelSize.Height - textBoundingBox.Size.Height) * 0.0 - textBoundingBox.Location.Y);
nfloat labelX;
switch (Element.HorizontalTextAlignment)
{
case TextAlignment.End:
labelX = locationOfTouchInLabel.X - (labelSize.Width - textBoundingBox.Size.Width);
break;
case TextAlignment.Center:
labelX = locationOfTouchInLabel.X - (labelSize.Width - textBoundingBox.Size.Width) / 2;
break;
default:
labelX = locationOfTouchInLabel.X;
break;
}
var locationOfTouchInTextContainer = new CGPoint(labelX - textContainerOffset.X, locationOfTouchInLabel.Y - textContainerOffset.Y);
nfloat partialFraction = 0;
var indexOfCharacter = (nint)layoutManager.CharacterIndexForPoint(locationOfTouchInTextContainer, textContainer, ref partialFraction);
nint scaledIndexOfCharacter = 0;
// Problem is that method CharacterIndexForPoint always returns index based on UILabel font
// ".SFUIText" which is the default Helvetica iOS font
// HACK is to scale indexOfCharacter for 13% because NeoSans-Light is narrower font than ".SFUIText"
if (label.Font.Name == "NeoSans-Light")
{
scaledIndexOfCharacter = (nint)(indexOfCharacter * 1.13);
}
// HelveticaNeue font family works perfect until character position in the string is more than 2000 chars
// some uncosnsistent behaviour
// if string has <b> tag than label.Font.Name from HelveticaNeue-Thin goes to HelveticaNeue-Bold
if (label.Font.Name.StartsWith("HelveticaNeue", StringComparison.InvariantCulture))
{
scaledIndexOfCharacter = (nint)(indexOfCharacter * 1.02);
}
foreach (var link in linkList)
{
var rangeLength = link.Range.Length;
var tolerance = 0;
if (label.Font.Name == "NeoSans-Light")
{
rangeLength = (nint)(rangeLength * 1.13);
tolerance = 25;
indexOfCharacter = scaledIndexOfCharacter;
}
if (label.Font.Name.StartsWith("HelveticaNeue", StringComparison.InvariantCulture))
{
if (link.Range.Location > 2000)
{
indexOfCharacter = scaledIndexOfCharacter;
}
}
// Xamarin version of NSLocationInRange?
if ((indexOfCharacter >= (link.Range.Location - tolerance)) && (indexOfCharacter < (link.Range.Location + rangeLength + tolerance)))
{
return(link.Url);
}
}
return(null);
}
private string DetectTappedUrl(UIGestureRecognizer tap, UILabel label, IEnumerable <LinkData> linkList)
{
var layoutManager = new NSLayoutManager();
var textContainer = new NSTextContainer();
var textStorage = new NSTextStorage();
textStorage.SetString(label.AttributedText);
layoutManager.AddTextContainer(textContainer);
textStorage.AddLayoutManager(layoutManager);
textContainer.LineFragmentPadding = 0;
textContainer.LineBreakMode = label.LineBreakMode;
textContainer.MaximumNumberOfLines = (nuint)label.Lines;
var labelSize = label.Bounds.Size;
textContainer.Size = labelSize;
var locationOfTouchInLabel = tap.LocationInView(label);
var textBoundingBox = layoutManager.GetUsedRectForTextContainer(textContainer);
var textContainerOffset = new CGPoint(
(labelSize.Width - textBoundingBox.Size.Width) * 0.0 - textBoundingBox.Location.X,
(labelSize.Height - textBoundingBox.Size.Height) * 0.0 - textBoundingBox.Location.Y);
nfloat labelX;
switch (Element.HorizontalTextAlignment)
{
case TextAlignment.End:
labelX = locationOfTouchInLabel.X - (labelSize.Width - textBoundingBox.Size.Width);
break;
case TextAlignment.Center:
labelX = locationOfTouchInLabel.X - (labelSize.Width - textBoundingBox.Size.Width) / 2;
break;
default:
labelX = locationOfTouchInLabel.X;
break;
}
var locationOfTouchInTextContainer = new CGPoint(labelX - textContainerOffset.X,
locationOfTouchInLabel.Y - textContainerOffset.Y);
nfloat partialFraction = 0;
var indexOfCharacter = (nint)layoutManager.CharacterIndexForPoint(locationOfTouchInTextContainer,
textContainer, ref partialFraction);
nint scaledIndexOfCharacter = 0;
if (label.Font.Name == "NeoSans-Light")
{
scaledIndexOfCharacter = (nint)(indexOfCharacter * 1.13);
}
if (label.Font.Name.StartsWith("HelveticaNeue", StringComparison.InvariantCulture))
{
scaledIndexOfCharacter = (nint)(indexOfCharacter * 1.02);
}
foreach (var link in linkList)
{
var rangeLength = link.Range.Length;
var tolerance = 0;
if (label.Font.Name == "NeoSans-Light")
{
rangeLength = (nint)(rangeLength * 1.13);
tolerance = 25;
indexOfCharacter = scaledIndexOfCharacter;
}
if (label.Font.Name.StartsWith("HelveticaNeue", StringComparison.InvariantCulture))
{
if (link.Range.Location > 2000)
{
indexOfCharacter = scaledIndexOfCharacter;
}
}
// Xamarin version of NSLocationInRange?
if ((indexOfCharacter >= (link.Range.Location - tolerance)) &&
(indexOfCharacter < (link.Range.Location + rangeLength + tolerance)))
{
return(link.Url);
}
}
return(null);
}
