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Run the entire Cocoa messagebox function on the main thread. 

This fixes bug https://github.com/libsdl-org/SDL/issues/4420
This commit is contained in:
Sam Lantinga 2021-07-27 14:57:18 -07:00
parent dfd3f30e88
commit 51c61d7cdf
2 changed files with 19 additions and 10 deletions
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27
src/video/cocoa/SDL_cocoamessagebox.m
View File

@ -89,10 +89,8 @@
@end
/* Display a Cocoa message box */
int
Cocoa_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
{ @autoreleasepool
static void
Cocoa_ShowMessageBoxImpl(const SDL_MessageBoxData *messageboxdata, int *buttonid, int *returnValue)
{
Cocoa_RegisterApp();
@ -133,11 +131,8 @@ Cocoa_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
SDLMessageBoxPresenter* presenter = [[[SDLMessageBoxPresenter alloc] initWithParentWindow:messageboxdata->window] autorelease];
[presenter performSelectorOnMainThread:@selector(showAlert:)
withObject:alert
waitUntilDone:YES];
[presenter showAlert:alert];
int returnValue = 0;
NSInteger clicked = presenter->clicked;
if (clicked >= NSAlertFirstButtonReturn) {
clicked -= NSAlertFirstButtonReturn;
@ -145,10 +140,24 @@ Cocoa_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
clicked = messageboxdata->numbuttons - 1 - clicked;
}
*buttonid = buttons[clicked].buttonid;
*returnValue = 0;
} else {
returnValue = SDL_SetError("Did not get a valid `clicked button' id: %ld", (long)clicked);
*returnValue = SDL_SetError("Did not get a valid `clicked button' id: %ld", (long)clicked);
}
}
/* Display a Cocoa message box */
int
Cocoa_ShowMessageBox(const SDL_MessageBoxData *messageboxdata, int *buttonid)
{ @autoreleasepool
{
__block int returnValue = 0;
if ([NSThread isMainThread]) {
Cocoa_ShowMessageBoxImpl(messageboxdata, buttonid, &returnValue);
} else {
dispatch_sync(dispatch_get_main_queue(), ^{ Cocoa_ShowMessageBoxImpl(messageboxdata, buttonid, &returnValue); });
}
return returnValue;
}}

2
test/testmessage.c
View File

@ -197,7 +197,7 @@ main(int argc, char *argv[])
success = SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
"Simple MessageBox",
"This is a simple error MessageBox with a parent window",
"This is a simple error MessageBox with a parent window. Press a key or close the window after dismissing this messagebox.",
window);
if (success == -1) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Error Presenting MessageBox: %s\n", SDL_GetError());