public DetailViewController(RSSFeedItem item)
: base(UITableViewStyle.Grouped, null, true)
{
var attributes = new NSAttributedStringDocumentAttributes();
attributes.DocumentType = NSDocumentType.HTML;
attributes.StringEncoding = NSStringEncoding.UTF8;
var error = new NSError();
var htmlString = new NSAttributedString(item.Description, attributes, ref error);
Root = new RootElement(item.Title)
{
new Section {
new StringElement(item.Author),
new StringElement(item.PublishDate),
new StyledMultilineElement(htmlString),
new HtmlElement("Full Article", item.Link)
}
};
NavigationItem.RightBarButtonItem = new UIBarButtonItem(UIBarButtonSystemItem.Action, async delegate
{
var message = item.Title + " " + item.Link + " #PlanetXamarin";
var social = new UIActivityViewController(new NSObject[] { new NSString(message) },
new UIActivity[] { new UIActivity() });
PresentViewController(social, true, null);
});
}
private void UpdateText()
{
if (Control == null || Element == null)
{
return;
}
var isHtml = HtmlLabel.GetIsHtml(Element);
if (!isHtml)
{
return;
}
var removeTags = HtmlLabel.GetRemoveHtmlTags(Element);
if (removeTags)
{
Control.Text = HtmlToText.ConvertHtml(Control.Text);
}
else
{
var value = Element.Text ?? string.Empty;
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var myHtmlData = NSData.FromString(value, NSStringEncoding.Unicode);
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
SetNeedsDisplay();
}
public static NSAttributedString ToAttributedString(this NSString source)
{
try
{
NSError error = null;
var data = NSData.FromString(source, NSStringEncoding.UTF8);
var attributes = new NSAttributedStringDocumentAttributes
{
DocumentType = NSDocumentType.HTML,
StringEncoding = NSStringEncoding.UTF8,
};
var attributedString = new NSAttributedString(data, attributes, ref error);
if (error != null)
{
return(new NSAttributedString());
}
return(attributedString);
}
catch
{
return(new NSAttributedString());
}
}
void UpdateTextHtml()
{
string text = Element.Text ?? string.Empty;
#if __MOBILE__
var attr = new NSAttributedStringDocumentAttributes
{
DocumentType = NSDocumentType.HTML
};
NSError nsError = null;
Control.AttributedText = new NSAttributedString(text, attr, ref nsError);
#else
var attr = new NSAttributedStringDocumentAttributes
{
DocumentType = NSDocumentType.HTML
};
var htmlData = new NSMutableData();
htmlData.SetData(text);
Control.AttributedStringValue = new NSAttributedString(htmlData, attr, out _);
#endif
_perfectSizeValid = false;
}
protected override void OnElementChanged(ElementChangedEventArgs <Label> e)
{
base.OnElementChanged(e);
var view = (HtmlFormattedLabel)Element;
if (view == null)
{
return;
}
if (view.Text == null)
{
return;
}
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
attr.StringEncoding = NSStringEncoding.UTF8;
//Append the html string with a style tag. This will make the fontsize and fontfamily attribute on a label work on HtmlFormattedLabel
var styles = @"<style>body{font - family: " + Element.FontFamily + "; font-size:" + Element.FontSize + "px;}</style>";
var htmlStringWithStyle = Element.Text + styles;
var myHtmlData = NSData.FromString(htmlStringWithStyle, NSStringEncoding.UTF8);
Control.Lines = 0;
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Label.TextProperty.PropertyName)
{
if (Control != null && Element != null && !string.IsNullOrWhiteSpace(Element.Text))
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
attr.StringEncoding = NSStringEncoding.UTF8;
if (Element.Text != null && Element.Text != "")
{
//Append the html string with a style tag. This will make the fontsize and fontfamily attribute on a label work on HtmlFormattedLabel
var styles = @"<style>body{font - family: " + Element.FontFamily + "; font-size:" + Element.FontSize + "px;}</style>";
var htmlStringWithStyle = Element.Text + styles;
var myHtmlData = NSData.FromString(htmlStringWithStyle, NSStringEncoding.UTF8);
Control.Lines = 0;
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
}
}
}
// <summary>
/// Set maxFontSize for accessibility - large text
/// </summary>
/// <param name="label"></param>
/// <param name="fontType"></param>
/// <param name="rawText"></param>
/// <param name="lineHeight"></param>
/// <param name="fontSize"></param>
/// <param name="maxFontSize"></param>
/// <param name="alignment"></param>
public static void InitUITextViewWithSpacingAndUrl(UITextView label, FontType fontType, string rawText, double lineHeight, float fontSize, float maxFontSize, UITextAlignment alignment = UITextAlignment.Left)
{
//Defining attibutes inorder to format the embedded link
NSAttributedStringDocumentAttributes documentAttributes = new NSAttributedStringDocumentAttributes {
DocumentType = NSDocumentType.HTML
};
documentAttributes.StringEncoding = NSStringEncoding.UTF8;
NSError error = null;
NSAttributedString attributedString = new NSAttributedString(NSData.FromString(rawText, NSStringEncoding.UTF8), documentAttributes, ref error);
NSMutableParagraphStyle paragraphStyle = new NSMutableParagraphStyle();
paragraphStyle.LineHeightMultiple = new nfloat(lineHeight);
paragraphStyle.Alignment = alignment;
NSMutableAttributedString text = new NSMutableAttributedString(attributedString);
NSRange range = new NSRange(0, text.Length);
text.AddAttribute(UIStringAttributeKey.ParagraphStyle, paragraphStyle, range);
text.AddAttribute(UIStringAttributeKey.Font, Font(fontType, fontSize, maxFontSize), range);
label.AttributedText = text;
label.TextColor = UIColor.White;
label.WeakLinkTextAttributes = new NSDictionary(UIStringAttributeKey.ForegroundColor, "#FADC5D".ToUIColor(), UIStringAttributeKey.UnderlineStyle, new NSNumber(1));
}
void initResizableText()
{
//ATT fpr HTML
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
contentLabel = new UILabel(new CGRect(24, 0, 720, 100));
contentLabel.LineBreakMode = UILineBreakMode.WordWrap;
contentLabel.TextColor = source.Color; // UIColor.Purple;
contentLabel.Font = UIFont.FromName(fontName, 24);
//contentLabel.Text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. quis nostrud exercitation END";
//contentLabel.Text = source.Paragraph ;
var myHtmlText = source.Paragraph; //"<b>Hello</b> <i>Everyone</i> ÆØÅ";
var myHtmlData = NSData.FromString(myHtmlText, NSStringEncoding.Unicode);
contentLabel.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
contentLabel.Font = UIFont.FromName(fontName, 24);
contentHeight = YConstants.ResizeHeigthWithText(contentLabel, maxHeight: 960f);
authorLabel = new UILabel(new CGRect(24, contentHeight + 12, 500, 24));
authorLabel.LineBreakMode = UILineBreakMode.WordWrap;
authorLabel.TextColor = UIColor.Gray;
authorLabel.Font = UIFont.FromName(fontName, 16);
//authorLabel.Text = "Author de la frase";
authorLabel.Text = source.Author;
authorHeight = YConstants.ResizeHeigthWithText(authorLabel, maxHeight: 960f);
borderHeight = authorHeight + contentHeight + 12;
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
EdgesForExtendedLayout = UIRectEdge.None;
UIScrollView scrollView = new UIScrollView();
scrollView.TranslatesAutoresizingMaskIntoConstraints = false;
View.AddSubview(scrollView);
TextContentLabel = new UILabel();
TextContentLabel.Lines = 0;
TextContentLabel.TranslatesAutoresizingMaskIntoConstraints = false;
scrollView.AddSubview(TextContentLabel);
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
TextContentLabel.AttributedText = new NSAttributedString(TextToView, attr, ref nsError);
var viewsDictionary = NSDictionary.FromObjectsAndKeys(new NSObject[] { scrollView, TextContentLabel }, new NSObject[] { new NSString("scrollView"), new NSString("TextContentLabel") });
scrollView.AddConstraints(NSLayoutConstraint.FromVisualFormat("H:|[TextContentLabel(scrollView)]|", 0, null, viewsDictionary));
scrollView.AddConstraints(NSLayoutConstraint.FromVisualFormat("V:|[TextContentLabel]|", 0, null, viewsDictionary));
View.AddConstraints(NSLayoutConstraint.FromVisualFormat("H:|-[scrollView]-|", 0, null, viewsDictionary));
View.AddConstraints(NSLayoutConstraint.FromVisualFormat("V:|-[scrollView]-|", 0, null, viewsDictionary));
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
var view = (HtmlLabel)Element;
if (view == null || string.IsNullOrEmpty(view.Text))
{
return;
}
UITextView textView;
if (Control == null)
{
textView = new UITextView();
SetNativeControl(textView);
}
else if (e.PropertyName == Label.TextProperty.PropertyName)
{
if (Element != null && !string.IsNullOrWhiteSpace(Element.Text))
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var text = "<style>body{font-family: '" + this.Control.Font.Name + "'; font-size:" + this.Control.Font.PointSize + "px;}</style>" + view.Text;
var myHtmlData = NSData.FromString(ParseText(text), NSStringEncoding.Unicode);
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
}
}
protected override void OnElementChanged(ElementChangedEventArgs <Label> e)
{
base.OnElementChanged(e);
#if __ANDROID__
if ((int)Build.VERSION.SdkInt >= 24)
{
Control?.SetText(Html.FromHtml(Element.Text, FromHtmlOptions.ModeLegacy), TextView.BufferType.Spannable); // SDK >= Android N
}
else
{
Control?.SetText(Html.FromHtml(Element.Text), TextView.BufferType.Spannable);
}
#elif __IOS__
if (Control != null && !string.IsNullOrWhiteSpace(Element?.Text))
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var myHtmlData = NSData.FromString(Element.Text, NSStringEncoding.Unicode);
Control.Lines = 0;
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
#elif WINDOWS_UWP
//TODO: Not sure what is needed here to render HTML on UWP
// Looks like what I need might be here:
// https://github.com/ryanvalentin/UWP-RichTextControls/blob/master/RichTextControls/RichTextControls/Generators/HtmlXamlGenerator.cs
#endif
}
private NSMutableAttributedString ApplyStylingToText(string text, FontType fontType, double lineHeight = 1.28, int fontSize = 16, int maxFontSize = 22, bool isLink = false)
{
//Wraps the string containing HTML, with styling tags inorder to ensure correct font, color, size.
string html = HtmlWrapper.HtmlForLabelWithText(text, 16, false, false, "#ffffff");
//Defining document type as HTML, set string encoding and formats an attributed string with these.
NSAttributedStringDocumentAttributes documentAttributes = new NSAttributedStringDocumentAttributes {
DocumentType = NSDocumentType.HTML
};
documentAttributes.StringEncoding = NSStringEncoding.UTF8;
NSError error = null;
NSAttributedString attributedString = new NSAttributedString(NSData.FromString(html, NSStringEncoding.UTF8), documentAttributes, ref error);
NSMutableAttributedString attributedTextToAppend = new NSMutableAttributedString(attributedString);
attributedTextToAppend.DeleteRange(new NSRange(attributedTextToAppend.Length - 1, 1));
NSMutableParagraphStyle paragraphStyle = new NSMutableParagraphStyle
{
LineHeightMultiple = new nfloat(lineHeight)
};
NSRange range = new NSRange(0, attributedTextToAppend.Length);
attributedTextToAppend.AddAttribute(UIStringAttributeKey.ParagraphStyle, paragraphStyle, range);
attributedTextToAppend.AddAttribute(UIStringAttributeKey.Font, Font(fontType, fontSize, maxFontSize), range);
//Add a hyperlink to this text, makes text clickable
if (isLink)
{
attributedTextToAppend.AddAttribute(UIStringAttributeKey.Link, new NSUrl("https://www." + text), range);
}
return(attributedTextToAppend);
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
NSAttributedStringDocumentAttributes documentAttributes = new NSAttributedStringDocumentAttributes
{
DocumentType = NSDocumentType.HTML, StringEncoding = NSStringEncoding.UTF8
};
NSError error = null;
NSAttributedString attributedString =
new NSAttributedString(NSData.FromString(ForceUpdateViewModel.FORCE_UPDATE_MESSAGE, NSStringEncoding.UTF8), documentAttributes, ref error);
if (error != null)
{
LogUtils.LogMessage(Enums.LogSeverity.ERROR, error.LocalizedDescription);
}
//Ensuring text is resiezed correctly when font size is increased
StyleUtil.InitLabekWithSpacingAndHTMLFormatting(
TextLabel, StyleUtil.FontType.FontBold, attributedString, 1.28, 24, 30, UITextAlignment.Center);
TextLabel.TextColor = ColorHelper.TEXT_COLOR_ON_BACKGROUND;
StyleUtil.InitButtonStyling(AppStoreLinkButton, ForceUpdateViewModel.FORCE_UPDATE_BUTTON_APPSTORE_IOS);
AppStoreLinkButton.AccessibilityTraits = UIAccessibilityTrait.Link;
FhiLogo.AccessibilityLabel = ForceUpdateViewModel.SMITTESPORING_FHI_LOGO_ACCESSIBILITY;
TextLabel.AccessibilityLabel = AccessibilityUtils.RemovePoorlySpokenSymbolsString(ForceUpdateViewModel.FORCE_UPDATE_MESSAGE);
}
protected override NSAttributedString Convert(string value, Type targetType, object parameter, CultureInfo culture)
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
//var label = parameter as UILabel;
//nfloat red = 0.0f;
//nfloat green = 0.0f;
//nfloat blue = 0.0f;
//nfloat alpha = 0.0f;
//label.TextColor.GetRGBA(out red, out green, out blue, out alpha);
//var stringWithFont = value + string.Format(
// "<style>body{{font-family: '{0}'; font-size:{1}px; color:rgb({2}, {3}, {4})}}</style>"
// , label.Font.Name
// , label.Font.PointSize
// , red * 255
// , green * 255
// , blue * 255);
var htmlData = NSData.FromString(value, NSStringEncoding.UTF8);
var attrStr = new NSAttributedString(htmlData, attr, ref nsError);
return(attrStr);
}
public DetailViewController(RSSFeedItem item)
: base(UITableViewStyle.Grouped, null, true)
{
var attributes = new NSAttributedStringDocumentAttributes();
attributes.DocumentType = NSDocumentType.HTML;
attributes.StringEncoding = NSStringEncoding.UTF8;
var error = new NSError();
var htmlString = new NSAttributedString(item.Description, attributes, ref error);
Root = new RootElement(item.Title) {
new Section{
new StringElement(item.Author),
new StringElement(item.PublishDate),
new StyledMultilineElement(htmlString),
new HtmlElement("Full Article", item.Link)
}
};
NavigationItem.RightBarButtonItem = new UIBarButtonItem(UIBarButtonSystemItem.Action, async delegate
{
var message = item.Title + " " + item.Link + " #PlanetXamarin";
var social = new UIActivityViewController(new NSObject[] { new NSString(message)},
new UIActivity[] { new UIActivity() });
PresentViewController(social, true, null);
});
}
private void CreateAttributedString(UILabel control, string html)
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var fontDescriptor = control.Font.FontDescriptor.VisibleName;
var fontFamily = fontDescriptor.ToLower().Contains("system") ? "-apple-system,system-ui,BlinkMacSystemFont,Segoe UI" : control.Font.FamilyName;
html += "<style> body{ font-family: " + fontFamily + ";}</style>";
// --------------
var myHtmlData = NSData.FromString(html, NSStringEncoding.Unicode);
// control.Lines = 0;
var mutable = new NSMutableAttributedString(new NSAttributedString(myHtmlData, attr, ref nsError));
if (mutable.MutableString.HasSuffix(new NSString("\n")))
{
mutable.DeleteRange(new NSRange(mutable.MutableString.Length - 1, 1));
}
var links = new List <LinkData>();
control.AttributedText = mutable;
}
public void EmitText(FormattedText text)
{
if (text.Attributes.Count == 0)
{
EmitText(text.Text, RichTextInlineStyle.Normal);
return;
}
var s = text.ToAttributedString();
var options = new NSAttributedStringDocumentAttributes();
options.DocumentType = NSDocumentType.HTML;
var exclude = NSArray.FromObjects(new [] { "doctype", "html", "head", "meta", "xml", "body", "p" });
options.Dictionary [NSExcludedElementsDocumentAttribute] = exclude;
NSError err;
var d = s.GetData(new NSRange(0, s.Length), options, out err);
var str = (string)NSString.FromData(d, NSStringEncoding.UTF8);
//bool first = true;
foreach (string line in str.Split(lineSplitChars, StringSplitOptions.None))
{
//if (!first) {
// xmlWriter.WriteStartElement ("br");
// xmlWriter.WriteEndElement ();
//} else
// first = false;
xmlWriter.WriteRaw(line);
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Label.TextProperty.PropertyName)
{
if (Control != null && Element != null && !string.IsNullOrWhiteSpace(Element.Text))
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
Control.TextColor.GetRGBA(out nfloat r, out nfloat g, out nfloat b, out nfloat a);
var textColor = string.Format("#{0:X2}{1:X2}{2:X2}", (int)(r * 255.0), (int)(g * 255.0), (int)(b * 255.0));
var font = Control.Font;
var fontName = font.Name;
var fontSize = font.PointSize;
var htmlContents = "<span style=\"font-family: '" + fontName + "'; color: " + textColor + "; font-size: " + fontSize + "\">" + Element.Text + "</span>";
var myHtmlData = NSData.FromString(htmlContents, NSStringEncoding.Unicode);
Control.Lines = 0;
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
}
}
protected override void OnElementChanged(ElementChangedEventArgs <Label> e)
{
base.OnElementChanged(e);
if (e.NewElement == null)
{
return;
}
if (Control == null)
{
return;
}
Control.Font = Font.RobotoLight(15f);
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var text = e.NewElement.Text;
//I wrap the text here with the default font and size
text = "<style>body{font-family: '" + this.Control.Font.Name + "'; font-size:" + this.Control.Font.PointSize + "px;}</style>" + text;
var myHtmlData = NSData.FromString(text, NSStringEncoding.Unicode);
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
var view = (HyperLinkControl)Element;
if (view == null)
{
return;
}
UITextView textView;
if (Control == null)
{
textView = new UITextView();
SetNativeControl(textView);
}
else if (e.PropertyName == Label.TextProperty.PropertyName)
{
if (Element != null && !string.IsNullOrWhiteSpace(Element.Text))
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var myHtmlData = NSData.FromString(view.Text, NSStringEncoding.Unicode);
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
}
}
private void SetHtmlText()
{
var element = (this.Element as AppLabel);
if ((element != null) && (!String.IsNullOrEmpty(element.HtmlText)))
{
try
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
nfloat r, g, b, a;
var elementColor = element.TextColor.ToUIColor();
elementColor.GetRGBA(out r, out g, out b, out a);
var textColor = string.Format("#{0:X2}{1:X2}{2:X2}", (int)(r * 255.0), (int)(g * 255.0), (int)(b * 255.0));
var html = element.HtmlText + String.Format("<style>body{{font-family: '{0}'; font-size:{1}px; color:{2}}}</style>", this.Control.Font.Name, this.Control.Font.PointSize, textColor);
var myHtmlData = NSData.FromString(html, NSStringEncoding.Unicode);
var attributedString = new NSAttributedString(myHtmlData, attr, ref nsError);
this.Control.AttributedText = attributedString;
}
catch (Exception exception)
{
Console.WriteLine(exception.Message);
}
}
}
public override UIView GetViewForHeader(UITableView tableView, nint section)
{
UITableViewCell header = new UITableViewCell(UITableViewCellStyle.Default, HeaderIdentifier);
header.TextLabel.Font = Styles.SetHelveticaFont(17);
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
if (section == 0)
{
var html = String.Format(AppDelegate.LanguageBundle.GetLocalizedString("alerts_not_read"), "<b><font color='red'>" + alerts.Where(x => !x.Read).Count().ToString() + "</font></b>");
var htmlStyle = string.Format("<style>body{{font-family:'{0}'; font-size:{1}px;}}</style>",
header.TextLabel.Font.FamilyName,
header.TextLabel.Font.PointSize);
var modifiedFont = String.Format("{0}{1}", htmlStyle, html);
header.TextLabel.AttributedText = new NSAttributedString(new NSString(modifiedFont).Encode(NSStringEncoding.Unicode, true), attr, ref nsError);
}
else
{
var html = String.Format(AppDelegate.LanguageBundle.GetLocalizedString("alerts_read"), "<b><font color='red'>" + alerts.Where(x => x.Read).Count().ToString() + "</font></b>");
var htmlStyle = string.Format("<style>body{{font-family:'{0}'; font-size:{1}px;}}</style>",
header.TextLabel.Font.FamilyName,
header.TextLabel.Font.PointSize);
var modifiedFont = String.Format("{0}{1}", htmlStyle, html);
header.TextLabel.AttributedText = new NSAttributedString(new NSString(modifiedFont).Encode(NSStringEncoding.Unicode, true), attr, ref nsError);
}
return(header);
}
private void UpdateText()
{
if (Control == null || Element == null)
{
return;
}
var isHtml = HtmlLabel.GetIsHtml(Element);
if (!isHtml)
{
return;
}
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var removeTags = HtmlLabel.GetRemoveHtmlTags(Element);
var text = removeTags ?
HtmlToText.ConvertHtml(Control.Text) :
Element.Text;
var helper = new LabelRendererHelper(Element, text);
var htmlData = NSData.FromString(helper.ToString(), NSStringEncoding.Unicode);
Control.AttributedText = new NSAttributedString(htmlData, attr, ref nsError);
SetNeedsDisplay();
}
protected override void OnElementPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName.Equals("Text") && Control != null)
{
// http://forums.xamarin.com/discussion/15530/nsattributedstringdocumentattributes-exception-on-ios-6
NSParagraphStyle ps = NSParagraphStyle.Default;
NSDictionary dict = new NSMutableDictionary() { {
UIStringAttributeKey.Font,
((ExtendedLabel)Element).Font.ToUIFont()
},
};
var attr = new NSAttributedStringDocumentAttributes(dict);
var nsError = new NSError();
// This line announces, that content is html.
attr.DocumentType = NSDocumentType.HTML;
attr.StringEncoding = NSStringEncoding.UTF8;
var html = ((ExtendedLabel)Element).TextExt + Environment.NewLine;
NSString htmlString = new NSString(html);
NSData htmlData = htmlString.Encode(NSStringEncoding.UTF8);
NSAttributedString attrStr = new NSAttributedString(htmlData, attr, out dict, ref nsError);
Control.AttributedText = attrStr;
Control.SizeToFit();
Control.SetNeedsLayout();
Element.HeightRequest = Control.Bounds.Height;
return;
}
if (e.PropertyName == "Height" || e.PropertyName == "Width")
{
// We calculate the correct height, because of the attributed string, Xamarin.Forms don't do it correct
var width = (float)((ExtendedLabel)Element).Width;
// Only do this, if we have a valid width
if (width != -1)
{
var rect = Control.AttributedText.GetBoundingRect(new CoreGraphics.CGSize(width, float.MaxValue), NSStringDrawingOptions.UsesLineFragmentOrigin | NSStringDrawingOptions.UsesFontLeading, null);
if (rect.Height != ((ExtendedLabel)Element).Height)
{
((ExtendedLabel)Element).HeightRequest = rect.Height;
}
}
}
base.OnElementPropertyChanged(sender, e);
}
private void SetHtmlText()
{
if (Control is UILabel label && Element is Label formLabel)
{
var documentAttributes = new NSAttributedStringDocumentAttributes();
documentAttributes.DocumentType = NSDocumentType.HTML;
var error = new NSError();
label.AttributedText = new NSAttributedString(formLabel.Text, documentAttributes, ref error);
}
}
public string FromHtml(string htmlFormat)
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var myHtmlData = NSData.FromString(htmlFormat, NSStringEncoding.Unicode);
return(new NSAttributedString(myHtmlData, attr, ref nsError).Value);
}
private void SetHtmlText(string text)
{
var attr = new NSAttributedStringDocumentAttributes {
DocumentType = NSDocumentType.HTML
};
var nsError = new NSError();
_textView.Editable = false;
_textView.AttributedText = new NSAttributedString(text, attr, ref nsError);
_textView.DataDetectorTypes = UIDataDetectorType.All;
}
public static NSAttributedString GetHTMLFormattedText(string toBeFormatted, string fontFace = "HelveticaNeue", float fontSize = 5, string fontColor = "#757575", bool center = false)
{
NSError error = null;
var formattedText = center ? $"<font face ='{fontFace}' size ={fontSize} color='{fontColor}'<center>{toBeFormatted}</center></font>"
: $"<font face ='{fontFace}' size ={fontSize} color='{fontColor}'<justify>{toBeFormatted}</justify></font>";
var attributes = new NSAttributedStringDocumentAttributes {
DocumentType = NSDocumentType.HTML, StringEncoding = NSStringEncoding.UTF8
};
return(new NSAttributedString(formattedText, attributes, ref error));
}
protected override void Bind()
{
base.Bind();
NSError error = null;
var documentAttributes = new NSAttributedStringDocumentAttributes {
DocumentType = NSDocumentType.HTML, StringEncoding = NSStringEncoding.UTF8
};
var attributedString = new NSAttributedString(Element.Html, documentAttributes, ref error);
HtmlLabel.AttributedText = attributedString;
}
private void CreateAttributedString(UILabel control, string html)
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
// --------------
// 02-01-2018 : Fix for default font family => https://github.com/matteobortolazzo/HtmlLabelPlugin/issues/9
var fontDescriptor = control.Font.FontDescriptor.VisibleName;
var fontFamily = fontDescriptor.ToLower().Contains("system") ? "-apple-system,system-ui,BlinkMacSystemFont,Segoe UI" : control.Font.FamilyName;
html += "<style> body{ font-family: " + fontFamily + ";}</style>";
// --------------
var myHtmlData = NSData.FromString(html, NSStringEncoding.Unicode);
// control.Lines = 0;
var mutable = new NSMutableAttributedString(new NSAttributedString(myHtmlData, attr, ref nsError));
var links = new List <LinkData>();
control.AttributedText = mutable;
// make a list of all links:
mutable.EnumerateAttributes(new NSRange(0, mutable.Length), NSAttributedStringEnumeration.LongestEffectiveRangeNotRequired, (NSDictionary attrs, NSRange range, ref bool stop) =>
{
foreach (var a in attrs) // should use attrs.ContainsKey(something) instead
{
if (a.Key.ToString() != "NSLink")
{
continue;
}
links.Add(new LinkData(range, a.Value.ToString()));
return;
}
});
// Set up a Gesture recognizer:
if (links.Count <= 0)
{
return;
}
control.UserInteractionEnabled = true;
var tapGesture = new UITapGestureRecognizer((tap) =>
{
var url = DetectTappedUrl(tap, (UILabel)tap.View, links);
if (url != null)
{
// open the link:
Device.OpenUri(new Uri(url));
}
});
control.AddGestureRecognizer(tapGesture);
}
public static string AttributedStringToHtml(NSAttributedString attributedString)
{
var range = new NSRange(0, attributedString.Length);
var dictionary = new NSAttributedStringDocumentAttributes();
dictionary.DocumentType = NSDocumentType.HTML;
NSError error = new NSError();
var data = attributedString.GetDataFromRange(range, dictionary, ref error);
var htmlString = new NSString(data, NSStringEncoding.UTF8);
var cleanHtml = CleanHtml(htmlString);
return(cleanHtml);
}
private void UpdateElement()
{
if (Control != null && Element != null && !string.IsNullOrWhiteSpace(Element.Text))
{
var attr = new NSAttributedStringDocumentAttributes();
var nsError = new NSError();
attr.DocumentType = NSDocumentType.HTML;
var myHtmlData = NSData.FromString(Element.Text, NSStringEncoding.Unicode);
Control.Lines = 0;
Control.AttributedText = new NSAttributedString(myHtmlData, attr, ref nsError);
}
}
public DetailViewController(RSSFeedItem item)
: base(UITableViewStyle.Grouped, null, true)
{
var attributes = new NSAttributedStringDocumentAttributes();
attributes.DocumentType = NSDocumentType.HTML;
attributes.StringEncoding = NSStringEncoding.UTF8;
var error = new NSError();
var htmlString = new NSAttributedString(item.Description, attributes, ref error);
Root = new RootElement(item.Title) {
new Section{
new StringElement(item.Author),
new StringElement(item.PublishDate),
new StyledMultilineElement(htmlString),
new HtmlElement("Full Article", item.Link)
}
};
}
/// <summary>
/// Converts HTML-formatted data to a string that contains the text content extracted from the HTML.
/// </summary>
/// <param name="html">A String containing HTML-formatted data.</param>
/// <returns>A String of text content.</returns>
public static string ConvertToText(string html)
{
// the platform implementations don't strip out unordered lists so we'll replace with bullet characters
int i = 0;
int i2;
while (i > -1)
{
i = html.IndexOf("<li");
if (i > -1)
{
i2 = html.IndexOf(">", i);
if (i2 > -1)
{
html = html.Replace(html.Substring(i, (i2 - i) + 1), "<p>• ");
}
}
}
i = 0;
while (i > -1)
{
i = html.IndexOf("<ul");
if (i > -1)
{
i2 = html.IndexOf(">", i);
if (i2 > -1)
{
html = html.Replace(html.Substring(i, (i2 - i) + 1), "");
}
}
}
i = 0;
while (i > -1)
{
i = html.IndexOf("<img");
if (i > -1)
{
i2 = html.IndexOf(">", i);
if (i2 > -1)
{
html = html.Replace(html.Substring(i, (i2 - i) + 1), "");
}
}
}
html = html.Replace("</ul>", "");
html = html.Replace("</li>", "<p/>");
#if __ANDROID__
ISpanned sp = Android.Text.Html.FromHtml(html);
return sp.ToString().Trim();
#elif __IOS__ || __TVOS__
byte[] data = global::System.Text.Encoding.UTF8.GetBytes(html);
NSData d = NSData.FromArray(data);
NSAttributedStringDocumentAttributes importParams = new NSAttributedStringDocumentAttributes();
importParams.DocumentType = NSDocumentType.HTML;
NSError error = new NSError();
error = null;
NSDictionary dict = new NSDictionary();
var attrString = new NSAttributedString(d, importParams, out dict, ref error);
return attrString.Value;
#elif WINDOWS_UWP || WINDOWS_APP || WINDOWS_PHONE_APP || WINDOWS_PHONE_81
return Windows.Data.Html.HtmlUtilities.ConvertToText(html);
#elif WINDOWS_PHONE || WIN32
return global::System.Net.WebUtility.HtmlDecode(Regex.Replace(html, "<(.|\n)*?>", ""));
#else
throw new global::System.PlatformNotSupportedException();
#endif
}
