internal static void SetAndFormatText(this TextBlock winTextBlock, Forms9Patch.Label f9pLabel, double altFontSize = -1)
{
var label = f9pLabel;
var textBlock = winTextBlock;
if (f9pLabel == null || textBlock == null)
{
return;
}
textBlock.Text = "";
textBlock.Inlines.Clear();
textBlock.FontSize = (altFontSize > 0 ? altFontSize : label.DecipheredFontSize());
textBlock.LineHeight = FontExtensions.LineHeightForFontSize(textBlock.FontSize);
textBlock.LineStackingStrategy = Windows.UI.Xaml.LineStackingStrategy.BaselineToBaseline;
textBlock.FontFamily = FontService.GetWinFontFamily(label.FontFamily);
if (label.Text != null)
{
textBlock.Text = label.Text;
return;
}
if (label.FormattedText != null)
{
var formattedText = label.FormattedText;
for (var i = 0; i < formattedText.Spans.Count; i++)
{
textBlock.Inlines.Add(formattedText.Spans[i].ToRun());
}
return;
}
var text = label.F9PFormattedString?.Text;
if (label.F9PFormattedString is HTMLMarkupString htmlMarkupString)
{
text = htmlMarkupString.UnmarkedText;
}
if (string.IsNullOrWhiteSpace(text) || text == label.F9PFormattedString?.Text)
{
// there isn't any markup!
textBlock.Text = text ?? "";
return;
}
#region Layout font-spans (MetaFonts)
var metaFonts = new List <MetaFont>();
var baseMetaFont = new MetaFont(
label.FontFamily,
textBlock.FontSize, //(altFontSize > 0 ? altFontSize : label.DecipheredFontSize()), //(label.FontSize < 0 ? (double)Windows.UI.Xaml.Application.Current.Resources["ControlContentThemeFontSize"] : label.FontSize)), //label.FontSize,
(label.FontAttributes & Xamarin.Forms.FontAttributes.Bold) > 0, //textBlock.FontWeight.Weight >= Windows.UI.Text.FontWeights.Bold.Weight,
(label.FontAttributes & Xamarin.Forms.FontAttributes.Italic) > 0, // (textBlock.FontStyle & Windows.UI.Text.FontStyle.Italic) > 0,
textColor: label.TextColor //,
//backgroundColor: label.BackgroundColor
);
var MathMetaFont = new MetaFont(baseMetaFont)
{
Family = "STIXGeneral" //FontService.ReconcileFontFamily("Forms9Patch.Resources.Fonts.STIXGeneral.otf", P42.Utils.ReflectionExtensions.GetAssembly(typeof(Forms9Patch.Label)))
};
for (int i = 0; i < text.Length; i++)
{
if (i + 1 < text.Length && text[i] == '\ud835' && text[i + 1] >= '\udc00' && text[i + 1] <= '\udeff')
{
metaFonts.Add(new MetaFont(MathMetaFont));
metaFonts.Add(new MetaFont(MathMetaFont)); // there are two because we're using a double byte unicode character
i++;
}
else
{
metaFonts.Add(new MetaFont(baseMetaFont));
}
}
#endregion
#region Apply non-font Spans
foreach (var span in label.F9PFormattedString._spans)
{
int spanStart = span.Start;
int spanEnd = span.End;
//spanEnd++;
if (spanEnd >= text.Length)
{
spanEnd = text.Length - 1;
}
for (int i = spanStart; i <= spanEnd; i++)
{
switch (span.Key)
{
case FontFamilySpan.SpanKey: // TextElement.FontFamily
var fontFamily = ((FontFamilySpan)span).FontFamilyName;
metaFonts[i].Family = fontFamily;
break;
case FontSizeSpan.SpanKey: // TextElement.FontSize
float size = ((FontSizeSpan)span).Size;
metaFonts[i].Size = (size < 0 ? metaFonts[i].Size * (-size) : size);
break;
case BoldSpan.SpanKey: // Bold span // TextElement.FontWeight (Thin, ExtraLight, Light, SemiLight, Normal, Medium, SemiBold, Bold, ExtraBold, Black, ExtraBlack)
metaFonts[i].Bold = true;
break;
case ItalicsSpan.SpanKey: // Italic span // TextElement.FontStyle (Normal, Italic, Oblique)
metaFonts[i].Italic = true;
break;
case FontColorSpan.SpanKey: // TextElement.Foreground
metaFonts[i].TextColor = ((FontColorSpan)span).Color;
break;
case UnderlineSpan.SpanKey: // Underline span // TextElement.TextDecorations = None, Strikethought, Underline
metaFonts[i].Underline = true;
break;
case StrikethroughSpan.SpanKey: // TextElement.TextDecorations = None, Strikethought, Underline
metaFonts[i].Strikethrough = true;
break;
case SuperscriptSpan.SpanKey: // Run with Typographic.Variants=FontVariants.Superscript while using Cambria
metaFonts[i].Baseline = FontBaseline.Superscript;
break;
case SubscriptSpan.SpanKey: // Run with Typographic.Varients=FontVariants.Subscript while using Cambria
metaFonts[i].Baseline = FontBaseline.Subscript;
break;
case NumeratorSpan.SpanKey: // no UWP solution - need to use SuperScript
metaFonts[i].Baseline = FontBaseline.Numerator;
break;
case DenominatorSpan.SpanKey: // no UWP solution - need to use Subscript
metaFonts[i].Baseline = FontBaseline.Denominator;
break;
case ActionSpan.SpanKey: // Hyperlink span ??
metaFonts[i].Action = new MetaFontAction((ActionSpan)span);
break;
case BackgroundColorSpan.SpanKey: // if Win10 fall creator's update, there is a solution: create TextHighlighter, set its BackgroundColor and add the Range (Start/End) to it's Ranges, and add to TextBlock.Highlighters
metaFonts[i].BackgroundColor = ((BackgroundColorSpan)span).Color;
break;
}
}
}
#endregion
#region Convert MetaFonts to InLines
var inlineColection = new List <Inline>();
// run through MetaFonts to see if we need to set new Font attributes
var lastMetaFont = baseMetaFont;
int startIndex = 0;
for (int i = 0; i < metaFonts.Count; i++)
{
var metaFont = metaFonts[i];
if (lastMetaFont != metaFont)
{
// we are at the start of a new span
if (i > 0) // && lastMetaFont != baseMetaFont)
{
AddInline(textBlock, label, lastMetaFont, text, startIndex, i - startIndex);
}
lastMetaFont = metaFont;
startIndex = i;
}
}
AddInline(textBlock, label, lastMetaFont, text, startIndex, text.Length - startIndex);
#endregion
}
static void AddInline(TextBlock textBlock, Forms9Patch.Label label, MetaFont metaFont, string text, int startIndex, int length)
{
var run = new Run();
run.Text = text.Substring(startIndex, length);
run.FontSize = metaFont.Size;
run.FontWeight = metaFont.Bold ? Windows.UI.Text.FontWeights.Bold : Windows.UI.Text.FontWeights.Normal;
run.FontStyle = metaFont.Italic ? Windows.UI.Text.FontStyle.Italic : Windows.UI.Text.FontStyle.Normal;
if (TextDecorationsPresent && metaFont.Strikethrough)
{
ApplyTextDecorations(run, Decoration.Strikethrough);
}
switch (metaFont.Baseline)
{
case FontBaseline.Numerator:
run.FontFamily = new Windows.UI.Xaml.Media.FontFamily("Cambria");
Typography.SetVariants(run, Windows.UI.Xaml.FontVariants.Superscript);
break;
case FontBaseline.Superscript:
run.FontFamily = new Windows.UI.Xaml.Media.FontFamily("Cambria");
Typography.SetVariants(run, Windows.UI.Xaml.FontVariants.Superscript);
break;
case FontBaseline.Denominator:
run.FontFamily = new Windows.UI.Xaml.Media.FontFamily("Cambria");
Typography.SetVariants(run, Windows.UI.Xaml.FontVariants.Subscript);
break;
case FontBaseline.Subscript:
run.FontFamily = new Windows.UI.Xaml.Media.FontFamily("Cambria");
Typography.SetVariants(run, Windows.UI.Xaml.FontVariants.Subscript);
break;
default:
if (metaFont.Family != null)
{
run.FontFamily = new Windows.UI.Xaml.Media.FontFamily(FontService.ReconcileFontFamily(metaFont.Family));
}
break;
}
if (!metaFont.BackgroundColor.IsDefaultOrTransparent())
{
try
{
textBlock.ApplyBackgroundColor(metaFont.BackgroundColor, startIndex, length);
}
catch (Exception)
{
//throw new Exception("It appears that this Xamarin.Forms.UWP app was built with a Windows TargetVersion < 10.0.16299.0 (Windows 10 Fall Creators Update). 10.0.16299.0 is needed to support Forms9Patch.Label.HtmlText background color attributes.", e);
}
}
if (metaFont.IsActionEmpty())
{
run.Foreground = new Windows.UI.Xaml.Media.SolidColorBrush(metaFont.TextColor.ToWindowsColor());
if (TextDecorationsPresent && metaFont.Underline)
{
ApplyTextDecorations(run, Decoration.Underline);
}
textBlock.Inlines.Add(run);
}
else
{
run.Foreground = new Windows.UI.Xaml.Media.SolidColorBrush(Xamarin.Forms.Color.Blue.ToWindowsColor());
if (TextDecorationsPresent)
{
ApplyTextDecorations(run, Decoration.Underline);
}
var hyperlink = new Hyperlink();
hyperlink.Inlines.Add(run);
hyperlink.Click += (Hyperlink sender, HyperlinkClickEventArgs args) => label.Tap(metaFont.Action.Id, metaFont.Action.Href);
textBlock.Inlines.Add(hyperlink);
}
}