Yes I had a look at Font.getGlyph(). Yes it returns null when no character is found. But Unicode is BIG and I wanted to avoid iterating through all possible unicode values since most likely the wildcard range of supported characters for a given field will be very small.
What I've done is extend the GeneratedFont class (FontTableAccessor : public GeneratedFont), and create two public accessors for ConstFont.glyphList and ConstFont.listSize.
Then I used the ApplicationFontProvider (fontProvider) to get the Generated font for the typography I'm interested in, then down-cast it to my new class extension.
Class heirarchy looks like this:
FONT -> CONSTFONT -> GENERATEDFONT -> FONTTABLEACCESSOR
- ConstFont is the home of glyphList and listSize (the information we're after).
- GeneratedFont is created for each typography when Designer generates code.
- FONT gets returned by the ApplicationFontProvider we can access from user code in the model.
- FontTableAccessor is my small addition to get at the protected members I needed.
FontTableAccessor* fontTableAccessor = (static_cast<FontTableAccessor*> fontProvider.getFont(Typography::XLARGE)));
const touchgfx::GlyphNode * glyphList = fontTableAccessor->getGlyphList();
int glyphTableSize = fontTableAccessor->getListSize();
for (int i = 0; i < glyphTableSize; i++)
{
// compare current character to glyphList[i].unicode
// then return glyphList[i+1].unicode (with some additional logic to make it circular)
}
