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using System.Text;
using Android.Graphics;
using Android.Text;
using Android.Text.Style;
using Android.Util;
using Android.Widget;
namespace Xamarin.Forms.Platform.Android
{
public static class FormattedStringExtensions
{
public static SpannableString ToAttributed(this FormattedString formattedString, Font defaultFont, Color defaultForegroundColor, TextView view)
{
if (formattedString == null)
return null;
var builder = new StringBuilder();
foreach (Span span in formattedString.Spans)
{
if (span.Text == null)
continue;
builder.Append(span.Text);
}
var spannable = new SpannableString(builder.ToString());
var c = 0;
foreach (Span span in formattedString.Spans)
{
if (span.Text == null)
continue;
int start = c;
int end = start + span.Text.Length;
c = end;
if (span.ForegroundColor != Color.Default)
{
spannable.SetSpan(new ForegroundColorSpan(span.ForegroundColor.ToAndroid()), start, end, SpanTypes.InclusiveExclusive);
}
else if (defaultForegroundColor != Color.Default)
{
spannable.SetSpan(new ForegroundColorSpan(defaultForegroundColor.ToAndroid()), start, end, SpanTypes.InclusiveExclusive);
}
if (span.BackgroundColor != Color.Default)
{
spannable.SetSpan(new BackgroundColorSpan(span.BackgroundColor.ToAndroid()), start, end, SpanTypes.InclusiveExclusive);
}
if (!span.IsDefault())
#pragma warning disable 618
spannable.SetSpan(new FontSpan(span.Font, view), start, end, SpanTypes.InclusiveInclusive);
#pragma warning restore 618
else if (defaultFont != Font.Default)
spannable.SetSpan(new FontSpan(defaultFont, view), start, end, SpanTypes.InclusiveInclusive);
}
return spannable;
}
class FontSpan : MetricAffectingSpan
{
public FontSpan(Font font, TextView view)
{
Font = font;
TextView = view;
}
public Font Font { get; }
public TextView TextView { get; }
public override void UpdateDrawState(TextPaint tp)
{
Apply(tp);
}
public override void UpdateMeasureState(TextPaint p)
{
Apply(p);
}
void Apply(Paint paint)
{
paint.SetTypeface(Font.ToTypeface());
float value = Font.ToScaledPixel();
paint.TextSize = TypedValue.ApplyDimension(ComplexUnitType.Sp, value, TextView.Resources.DisplayMetrics);
}
}
}
}
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