On-screen keyboard #6
Description
Implement on-screen keyboard.
Must have the following:
- 4 levels (disable, exit only, exit and start/select, all)
- D-Pad, AB keys, Select/Start keys have separate toggle modes that, once enabled, tapping the keys on screen will toggle the key state on and off.
- Adaptive to various screen resolutions --- at least 320x240 and 480x272 should just work.
Toggle mode is required not only because we are dealing with resistive touch screen which lacks multitouch capability, but also because that touch and hold massively reduces performance across all known Besta RTOS devices with a touch screen.