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Fixed duplicate key press/release events on iOS

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When a hardware keyboard is attached, it can take over 100 ms for the keyboard event to generate text input. In that case we want to record that we recently received a keyboard event so we don't synthesize duplicate virtual key press/release events for the input text.

(cherry picked from commit 648de4f9b8ebcf9e794aba2ec2955d129167c48b)
This commit is contained in:
Sam Lantinga 2023-08-02 01:08:00 -07:00
parent 030bb7282a
commit 38c63afd64
3 changed files with 29 additions and 9 deletions
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31
src/events/SDL_keyboard.c
View file

@ -34,7 +34,8 @@
/* Global keyboard information */
#define KEYBOARD_HARDWARE 0x01
#define KEYBOARD_AUTORELEASE 0x02
#define KEYBOARD_VIRTUAL 0x02
#define KEYBOARD_AUTORELEASE 0x04
typedef struct SDL_Keyboard SDL_Keyboard;
@ -47,6 +48,7 @@ struct SDL_Keyboard
Uint8 keystate[SDL_NUM_SCANCODES];
SDL_Keycode keymap[SDL_NUM_SCANCODES];
SDL_bool autorelease_pending;
Uint32 hardware_timestamp;
};
static SDL_Keyboard SDL_keyboard;
@ -865,7 +867,9 @@ static int SDL_SendKeyboardKeyInternal(Uint8 source, Uint8 state, SDL_Scancode s
keycode = keyboard->keymap[scancode];
}
if (source == KEYBOARD_AUTORELEASE) {
if (source == KEYBOARD_HARDWARE) {
keyboard->hardware_timestamp = SDL_GetTicks();
} else if (source == KEYBOARD_AUTORELEASE) {
keyboard->autorelease_pending = SDL_TRUE;
}
@ -965,20 +969,25 @@ int SDL_SendKeyboardUnicodeKey(Uint32 ch)
if (mod & KMOD_SHIFT) {
/* If the character uses shift, press shift down */
SDL_SendKeyboardKey(SDL_PRESSED, SDL_SCANCODE_LSHIFT);
SDL_SendKeyboardKeyInternal(KEYBOARD_VIRTUAL, SDL_PRESSED, SDL_SCANCODE_LSHIFT, SDLK_UNKNOWN);
}
/* Send a keydown and keyup for the character */
SDL_SendKeyboardKey(SDL_PRESSED, code);
SDL_SendKeyboardKey(SDL_RELEASED, code);
SDL_SendKeyboardKeyInternal(KEYBOARD_VIRTUAL, SDL_PRESSED, code, SDLK_UNKNOWN);
SDL_SendKeyboardKeyInternal(KEYBOARD_VIRTUAL, SDL_RELEASED, code, SDLK_UNKNOWN);
if (mod & KMOD_SHIFT) {
/* If the character uses shift, release shift */
SDL_SendKeyboardKey(SDL_RELEASED, SDL_SCANCODE_LSHIFT);
SDL_SendKeyboardKeyInternal(KEYBOARD_VIRTUAL, SDL_RELEASED, SDL_SCANCODE_LSHIFT, SDLK_UNKNOWN);
}
return 0;
}
int SDL_SendVirtualKeyboardKey(Uint8 state, SDL_Scancode scancode)
{
return SDL_SendKeyboardKeyInternal(KEYBOARD_VIRTUAL, state, scancode, SDLK_UNKNOWN);
}
int SDL_SendKeyboardKey(Uint8 state, SDL_Scancode scancode)
{
return SDL_SendKeyboardKeyInternal(KEYBOARD_HARDWARE, state, scancode, SDLK_UNKNOWN);
@ -1007,6 +1016,13 @@ void SDL_ReleaseAutoReleaseKeys(void)
}
keyboard->autorelease_pending = SDL_FALSE;
}
if (keyboard->hardware_timestamp) {
/* Keep hardware keyboard "active" for 250 ms */
if (SDL_TICKS_PASSED(SDL_GetTicks(), keyboard->hardware_timestamp + 250)) {
keyboard->hardware_timestamp = 0;
}
}
}
SDL_bool SDL_HardwareKeyboardKeyPressed(void)
@ -1019,7 +1035,8 @@ SDL_bool SDL_HardwareKeyboardKeyPressed(void)
return SDL_TRUE;
}
}
return SDL_FALSE;
return keyboard->hardware_timestamp ? SDL_TRUE : SDL_FALSE;
}
int SDL_SendKeyboardText(const char *text)

3
src/events/SDL_keyboard_c.h
View file

@ -52,6 +52,9 @@ extern void SDL_SetKeyboardFocus(SDL_Window *window);
*/
extern int SDL_SendKeyboardUnicodeKey(Uint32 ch);
/* Send a key from a virtual key source, like an on-screen keyboard */
extern int SDL_SendVirtualKeyboardKey(Uint8 state, SDL_Scancode scancode);
/* Send a keyboard key event */
extern int SDL_SendKeyboardKey(Uint8 state, SDL_Scancode scancode);
extern int SDL_SendKeyboardKeyAutoRelease(SDL_Scancode scancode);

4
src/video/uikit/SDL_uikitviewcontroller.m
View file

@ -467,8 +467,8 @@ SDL_HideHomeIndicatorHintChanged(void *userdata, const char *name, const char *o
size_t deleteLength = SDL_utf8strlen([[committedText substringFromIndex:matchLength] UTF8String]);
while (deleteLength > 0) {
/* Send distinct down and up events for each backspace action */
SDL_SendKeyboardKey(SDL_PRESSED, SDL_SCANCODE_BACKSPACE);
SDL_SendKeyboardKey(SDL_RELEASED, SDL_SCANCODE_BACKSPACE);
SDL_SendVirtualKeyboardKey(SDL_PRESSED, SDL_SCANCODE_BACKSPACE);
SDL_SendVirtualKeyboardKey(SDL_RELEASED, SDL_SCANCODE_BACKSPACE);
--deleteLength;
}
}