ui/cocoa: user friendly characters for release mouse

While mouse is grabbed, window title contains a hint for the user what
keyboard keys to press to release the mouse. Make that hint text a bit
more user friendly for a Mac user:

 - Replace "Ctrl" and "Alt" by appropriate symbols for those keyboard
   keys typically displayed for them on a Mac (encode those symbols by
   using UTF-8 characters).

 - Drop " + " in between the keys, as that's not common on macOS for
   documenting keyboard shortcuts.

 - Convert lower case "g" to upper case "G", as that's common on macOS.

 - Add one additional space at start and end of key stroke set, to
   visually separate the key strokes from the rest of the text.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <E1pAClj-0003Jo-OB@lizzy.crudebyte.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/ui/cocoa.m b/ui/cocoa.m
index e915c34..289a2b1 100644
--- a/ui/cocoa.m
+++ b/ui/cocoa.m
@@ -72,6 +72,9 @@
 
 #define cgrect(nsrect) (*(CGRect *)&(nsrect))
 
+#define UC_CTRL_KEY "\xe2\x8c\x83"
+#define UC_ALT_KEY "\xe2\x8c\xa5"
+
 typedef struct {
     int width;
     int height;
@@ -1135,9 +1138,9 @@ static CGEventRef handleTapEvent(CGEventTapProxy proxy, CGEventType type, CGEven
 
     if (!isFullscreen) {
         if (qemu_name)
-            [normalWindow setTitle:[NSString stringWithFormat:@"QEMU %s - (Press ctrl + alt + g to release Mouse)", qemu_name]];
+            [normalWindow setTitle:[NSString stringWithFormat:@"QEMU %s - (Press  " UC_CTRL_KEY " " UC_ALT_KEY " G  to release Mouse)", qemu_name]];
         else
-            [normalWindow setTitle:@"QEMU - (Press ctrl + alt + g to release Mouse)"];
+            [normalWindow setTitle:@"QEMU - (Press  " UC_CTRL_KEY " " UC_ALT_KEY " G  to release Mouse)"];
     }
     [self hideCursor];
     CGAssociateMouseAndMouseCursorPosition(isAbsoluteEnabled);