From: John Arbuckle Date: Fri, 25 Sep 2015 22:14:00 +0000 (+0100) Subject: ui/cocoa.m: prevent stuck key situation X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3b178b7130ecf4005cd73d0c40e964c9d0d31a48;p=qemu.git ui/cocoa.m: prevent stuck key situation When the user puts QEMU in the background while holding down a key, QEMU will not receive the keyup event when the user lets go of the key. When the user goes back to QEMU, QEMU will think the key is still down causing stuck key symptoms. This patch fixes this problem by releasing all down keys when QEMU goes into the background. Signed-off-by: John Arbuckle Message-id: 7A3FA6EE-84C8-4422-A786-C899B7229D32@gmail.com Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- diff --git a/ui/cocoa.m b/ui/cocoa.m index 7c64e1a5aa..d436780faf 100644 --- a/ui/cocoa.m +++ b/ui/cocoa.m @@ -304,6 +304,7 @@ static void handleAnyDeviceErrors(Error * err) - (float) cdx; - (float) cdy; - (QEMUScreen) gscreen; +- (void) raiseAllKeys; @end QemuCocoaView *cocoaView; @@ -798,6 +799,24 @@ QemuCocoaView *cocoaView; - (float) cdx {return cdx;} - (float) cdy {return cdy;} - (QEMUScreen) gscreen {return screen;} + +/* + * Makes the target think all down keys are being released. + * This prevents a stuck key problem, since we will not see + * key up events for those keys after we have lost focus. + */ +- (void) raiseAllKeys +{ + int index; + const int max_index = ARRAY_SIZE(modifiers_state); + + for (index = 0; index < max_index; index++) { + if (modifiers_state[index]) { + modifiers_state[index] = 0; + qemu_input_event_send_key_number(dcl->con, index, false); + } + } +} @end @@ -955,6 +974,13 @@ QemuCocoaView *cocoaView; return NO; } +/* Called when QEMU goes into the background */ +- (void) applicationWillResignActive: (NSNotification *)aNotification +{ + COCOA_DEBUG("QemuCocoaAppController: applicationWillResignActive\n"); + [cocoaView raiseAllKeys]; +} + - (void)startEmulationWithArgc:(int)argc argv:(char**)argv { COCOA_DEBUG("QemuCocoaAppController: startEmulationWithArgc\n");