/// <summary>
/// Recursives the prepare spannable indexes.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="text">The text.</param>
/// <param name="size">The size.</param>
/// <param name="builder">The builder.</param>
/// <param name="modules">The modules.</param>
/// <param name="start">The start.</param>
/// <exception cref="System.ArgumentException">
/// Unknown resource + stroke + in \ + text + \
/// or
/// Unknown resource + stroke + in \ + text + \
/// or
/// Unknown resource + stroke + in \ + text + \
/// or
/// Unknown resource + stroke + in \ + text + \
/// or
/// Unknown expression + stroke + in \ + text + \
/// </exception>
private static void RecursivePrepareSpannableIndexes(Context context, String text, Single size, SpannableStringBuilder builder, IList <IIconModule> modules, Int32 start)
{
// Try to find a {...} in the string and extract expression from it
var stringText = builder.ToString();
var startIndex = stringText.IndexOf("{", start, StringComparison.Ordinal);
if (startIndex == -1)
{
return;
}
var endIndex = stringText.IndexOf("}", startIndex, StringComparison.Ordinal) + 1;
var expression = stringText.Substring(startIndex + 1, endIndex - 2);
// Split the expression and retrieve the icon key
var strokes = expression.Split(' ');
var key = strokes[0];
// Loop through the descriptors to find a key match
IIconModule module = null;
IIcon icon = null;
for (var i = 0; i < modules.Count; i++)
{
module = modules[i];
icon = module.GetIcon(key);
if (icon != null)
{
break;
}
}
// If no match, ignore and continue
if (icon == null)
{
RecursivePrepareSpannableIndexes(context, text, size, builder, modules, endIndex);
return;
}
// See if any more stroke within {} should be applied
var iconSizePx = spToPx(context, size);
var iconColor = Int32.MaxValue;
var iconSizeRatio = -1f;
var spin = false;
var baselineAligned = false;
for (var i = 1; i < strokes.Length; i++)
{
var stroke = strokes[i];
// Look for "spin"
if (stroke.Equals("spin", StringComparison.OrdinalIgnoreCase))
{
spin = true;
}
// Look for "baseline"
else if (stroke.Equals("baseline", StringComparison.OrdinalIgnoreCase))
{
baselineAligned = true;
}
// Look for an icon size
else if (Regex.IsMatch(stroke, "([0-9]*(\\.[0-9]*)?)dp"))
{
iconSizePx = dpToPx(context, Convert.ToSingle(stroke.Substring(0, stroke.Length - 2)));
}
else if (Regex.IsMatch(stroke, "([0-9]*(\\.[0-9]*)?)sp"))
{
iconSizePx = spToPx(context, Convert.ToSingle(stroke.Substring(0, stroke.Length - 2)));
}
else if (Regex.IsMatch(stroke, "([0-9]*)px"))
{
iconSizePx = Convert.ToInt32(stroke.Substring(0, stroke.Length - 2));
}
else if (Regex.IsMatch(stroke, "@dimen/(.*)"))
{
iconSizePx = GetPxFromDimen(context, context.PackageName, stroke.Substring(7));
if (iconSizePx < 0)
{
throw new ArgumentException("Unknown resource " + stroke + " in \"" + text + "\"");
}
}
else if (Regex.IsMatch(stroke, "@android:dimen/(.*)"))
{
iconSizePx = GetPxFromDimen(context, ANDROID_PACKAGE_NAME, stroke.Substring(15));
if (iconSizePx < 0)
{
throw new ArgumentException("Unknown resource " + stroke + " in \"" + text + "\"");
}
}
else if (Regex.IsMatch(stroke, "([0-9]*(\\.[0-9]*)?)%"))
{
iconSizeRatio = Convert.ToSingle(stroke.Substring(0, stroke.Length - 1)) / 100f;
}
// Look for an icon color
else if (Regex.IsMatch(stroke, "#([0-9A-Fa-f]{6}|[0-9A-Fa-f]{8})"))
{
iconColor = Color.ParseColor(stroke);
}
else if (Regex.IsMatch(stroke, "@color/(.*)"))
{
iconColor = GetColorFromResource(context, context.PackageName, stroke.Substring(7));
if (iconColor == Int32.MaxValue)
{
throw new ArgumentException("Unknown resource " + stroke + " in \"" + text + "\"");
}
}
else if (Regex.IsMatch(stroke, "@android:color/(.*)"))
{
iconColor = GetColorFromResource(context, ANDROID_PACKAGE_NAME, stroke.Substring(15));
if (iconColor == Int32.MaxValue)
{
throw new ArgumentException("Unknown resource " + stroke + " in \"" + text + "\"");
}
}
else
{
throw new ArgumentException("Unknown expression " + stroke + " in \"" + text + "\"");
}
}
// Replace the character and apply the typeface
builder = (SpannableStringBuilder)builder.Replace(startIndex, endIndex, "" + icon.Character);
builder.SetSpan(new CustomTypefaceSpan(icon, module.ToTypeface(context), iconSizePx, iconSizeRatio, iconColor, spin, baselineAligned), startIndex, startIndex + 1, SpanTypes.InclusiveExclusive);
RecursivePrepareSpannableIndexes(context, text, size, builder, modules, startIndex);
}
