private static void recursivePrepareSpannableIndexes(Context context, string fullText, SpannableStringBuilder text, IList<IconFontDescriptorWrapper> iconFontDescriptors, int start)
{
// Try to find a {...} in the string and extract expression from it
string stringText = text.ToString();
int startIndex = stringText.IndexOf("{", start, StringComparison.Ordinal);
if (startIndex == -1)
{
return;
}
int endIndex = stringText.IndexOf("}", startIndex, StringComparison.Ordinal) + 1;
string expression = stringText.Substring(startIndex + 1, endIndex - 1 - (startIndex + 1));
// Split the expression and retrieve the icon key
string[] strokes = expression.Split(" ", true);
string key = strokes[0];
// Loop through the descriptors to find a key match
IconFontDescriptorWrapper iconFontDescriptor = null;
Icon icon = null;
for (int i = 0; i < iconFontDescriptors.Count; i++)
{
iconFontDescriptor = iconFontDescriptors[i];
icon = iconFontDescriptor.getIcon(key);
if (icon != null)
{
break;
}
}
// If no match, ignore and continue
if (icon == null)
{
recursivePrepareSpannableIndexes(context, fullText, text, iconFontDescriptors, endIndex);
return;
}
// See if any more stroke within {} should be applied
float iconSizePx = -1;
int iconColor = int.MaxValue;
float iconSizeRatio = -1;
bool spin = false;
for (int i = 1; i < strokes.Length; i++)
{
string stroke = strokes[i];
// Look for "spin"
if (stroke.Equals("spin", StringComparison.CurrentCultureIgnoreCase))
{
spin = true;
}
// Look for an icon size
else if (stroke.matches("([0-9]*(\\.[0-9]*)?)dp"))
{
iconSizePx = dpToPx(context, Convert.ToSingle(stroke.Substring(0, stroke.Length - 2)));
}
else if (stroke.matches("([0-9]*(\\.[0-9]*)?)sp"))
{
iconSizePx = spToPx(context, Convert.ToSingle(stroke.Substring(0, stroke.Length - 2)));
}
else if (stroke.matches("([0-9]*)px"))
{
iconSizePx = Convert.ToInt32(stroke.Substring(0, stroke.Length - 2));
}
else if (stroke.matches("@dimen/(.*)"))
{
iconSizePx = getPxFromDimen(context, stroke.Substring(7));
if (iconSizePx < 0)
{
throw new System.ArgumentException("Unknown resource " + stroke + " in \"" + fullText + "\"");
}
}
else if (stroke.matches("([0-9]*(\\.[0-9]*)?)%"))
{
iconSizeRatio = Convert.ToSingle(stroke.Substring(0, stroke.Length - 1)) / 100f;
}
// Look for an icon color
else if (stroke.matches("#([0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})"))
{
iconColor = Color.parseColor(stroke);
}
else if (stroke.matches("@color/(.*)"))
{
iconColor = getColorFromResource(context, stroke.Substring(7));
if (iconColor == int.MaxValue)
{
throw new System.ArgumentException("Unknown resource " + stroke + " in \"" + fullText + "\"");
}
}
else
{
throw new System.ArgumentException("Unknown expression " + stroke + " in \"" + fullText + "\"");
}
}
// Replace the character and apply the typeface
text = text.replace(startIndex, endIndex, "" + icon.character());
text.setSpan(new CustomTypefaceSpan(icon, iconFontDescriptor.getTypeface(context), iconSizePx, iconSizeRatio, iconColor, spin), startIndex, startIndex + 1, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
recursivePrepareSpannableIndexes(context, fullText, text, iconFontDescriptors, startIndex);
}
