IME improvements proposal

[isage]

There are platforms (psvita / switch), where on-screen keyboard takes whole screen and have no way to provide SDL_TEXTEDITING event. Instead, those support setting initial text and dialog title. They also allow to set dialog type (e.g. text, numeric, etc.)

Proposal is to have something like SDL_StartTextInputAdvanced(const char* title, const char* initial_text, SDL_ImeType type);
That also requires different from SDL_TEXTINPUT event, because SDL_TEXTINPUT works properly only in conjunction with SDL_TEXTEDITING.

This was requested by devilutionX developers, so here's real life usage example:
When creating new player character, engine generates initial name for it, which player can change.
Problem 1: right now it's impossible to pass such name to OSK.
Problem 2: After user finishes text input in OSK, OSK sends SDL_TEXTINPUT event with whole text. So while on desktop platforms this works well, because there's SDL_TEXTEDITING event, and if user removed/edited initial name - that's handled, on vita and switch that leads to text from OSK being appended to initial player name instead, as engine doesn't/can't know if initial name was edited/removed.

[slouken]

Do you have a proposed patch that implements this, and a test program to verify it?

[isage]

Nope

[icculus]

This is bumping out of 2.0.18, but I would like to do something like this for the Switch branch sooner than later, so I might take a stab at it for 2.0.20.

[slouken]

SDL 2.0 is now in maintenance mode, and all inactive issues are being closed. If this issue is impacting you, please feel free to reopen it with additional information.