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Synthesize a missing touch-up event. 

If a touch-down event is received for an existing touch-ID, that
probably means the operating system lost it, and that the missing
touch-up should be synthesized, to keep the client state coherent.
This commit is contained in:
ulatekh 2022-01-21 17:10:09 -07:00 committed by Sam Lantinga
parent d2456b6e4c
commit 8f8b14cbb6
1 changed files with 3 additions and 2 deletions
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5
src/events/SDL_touch.c
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@ -302,8 +302,9 @@ SDL_SendTouch(SDL_TouchID id, SDL_FingerID fingerid, SDL_Window * window,
finger = SDL_GetFinger(touch, fingerid); finger = SDL_GetFinger(touch, fingerid);
if (down) { if (down) {
if (finger) { if (finger) {
/* This finger is already down */ /* This finger is already down.
return 0; Assume the finger-up for the previous touch was lost, and send it. */
SDL_SendTouch(id, fingerid, window, SDL_FALSE, x, y, pressure);
} }
if (SDL_AddFinger(touch, fingerid, x, y, pressure) < 0) { if (SDL_AddFinger(touch, fingerid, x, y, pressure) < 0) {