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Add default handler for Alt+Tab while keyboard grab is enabled 

By default, we will minimize the window when we receive Alt+Tab with a
full-screen keyboard grabbed window to allow the user to escape the
full-screen application.

Some applications like remote desktop clients may want to handle Alt+Tab
themselves, so provide an opt-out via SDL_HINT_ALLOW_ALT_TAB_WHILE_GRABBED=0.
This commit is contained in:
Cameron Gutman 2021-01-27 20:41:36 -06:00
parent 9d70711342
commit 79cd8cab08
2 changed files with 30 additions and 0 deletions
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13
include/SDL_hints.h
View File

@ -1587,6 +1587,19 @@ extern "C" {
*/
#define SDL_HINT_AUDIO_DEVICE_STREAM_NAME "SDL_AUDIO_DEVICE_STREAM_NAME"
/**
* \brief Specify the behavior of Alt+Tab while the keyboard is grabbed.
*
* By default, SDL emulates Alt+Tab functionality while the keyboard is grabbed
* and your window is full-screen. This prevents the user from getting stuck in
* your application if you've enabled keyboard grab.
*
* The variable can be set to the following values:
* "0" - SDL will not handle Alt+Tab. Your application is responsible
for handling Alt+Tab while the keyboard is grabbed.
* "1" - SDL will minimize your window when Alt+Tab is pressed (default)
*/
#define SDL_HINT_ALLOW_ALT_TAB_WHILE_GRABBED "SDL_ALLOW_ALT_TAB_WHILE_GRABBED"
/**
* \brief Override for SDL_GetPreferredLocales()

17
src/events/SDL_keyboard.c
View File

@ -22,6 +22,7 @@
/* General keyboard handling code for SDL */
#include "SDL_hints.h"
#include "SDL_timer.h"
#include "SDL_events.h"
#include "SDL_events_c.h"
@ -799,6 +800,22 @@ SDL_SendKeyboardKeyInternal(Uint8 source, Uint8 state, SDL_Scancode scancode)
event.key.windowID = keyboard->focus ? keyboard->focus->id : 0;
posted = (SDL_PushEvent(&event) > 0);
}
/* If the keyboard is grabbed and the grabbed window is in full-screen,
minimize the window when we receive Alt+Tab, unless the application
has explicitly opted out of this behavior. */
if (keycode == SDLK_TAB &&
state == SDL_PRESSED &&
(keyboard->modstate & KMOD_ALT) &&
keyboard->focus &&
(keyboard->focus->flags & SDL_WINDOW_KEYBOARD_GRABBED) &&
(keyboard->focus->flags & SDL_WINDOW_FULLSCREEN) &&
SDL_GetHintBoolean(SDL_HINT_ALLOW_ALT_TAB_WHILE_GRABBED, SDL_TRUE)) {
/* We will temporarily forfeit our grab by minimizing our window,
allowing the user to escape the application */
SDL_MinimizeWindow(keyboard->focus);
}
return (posted);
}