ui/cocoa.m: move ungrab to ctrl-alt-g

Currently the cocoa user interface relis on the user pushing
control-alt to ungrab the mouse.  This is patch changes the key
combination to control-alt-g to be in line with the GTK user
interface.
Signed-off-by: NJohn Arbuckle <programmingkidx@gmail.com>
Message-id: 20171102213907.11443-1-programmingkidx@gmail.com
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

ui/cocoa.m

@@ -674,10 +674,6 @@ QemuCocoaView *cocoaView;
                 }
             }
 
-            // release Mouse grab when pressing ctrl+alt
-            if (([event modifierFlags] & NSEventModifierFlagControl) && ([event modifierFlags] & NSEventModifierFlagOption)) {
-                [self ungrabMouse];
-            }
             break;
         case NSEventTypeKeyDown:
             keycode = cocoa_keycode_to_qemu([event keyCode]);
@@ -690,14 +686,23 @@ QemuCocoaView *cocoaView;
 
             // default
 
-            // handle control + alt Key Combos (ctrl+alt is reserved for QEMU)
+            // handle control + alt Key Combos (ctrl+alt+[1..9,g] is reserved for QEMU)
             if (([event modifierFlags] & NSEventModifierFlagControl) && ([event modifierFlags] & NSEventModifierFlagOption)) {
-                switch (keycode) {
-
-                    // enable graphic console
-                    case Q_KEY_CODE_1 ... Q_KEY_CODE_9: // '1' to '9' keys
-                        console_select(keycode - Q_KEY_CODE_1);
-                        break;
+                NSString *keychar = [event charactersIgnoringModifiers];
+                if ([keychar length] == 1) {
+                    char key = [keychar characterAtIndex:0];
+                    switch (key) {
+
+                        // enable graphic console
+                        case '1' ... '9':
+                            console_select(key - '0' - 1); /* ascii math */
+                            return;
+
+                        // release the mouse grab
+                        case 'g':
+                            [self ungrabMouse];
+                            return;
+                    }
                 }
 
             // handle keys for graphic console
@@ -840,9 +845,9 @@ QemuCocoaView *cocoaView;
 
     if (!isFullscreen) {
         if (qemu_name)
-            [normalWindow setTitle:[NSString stringWithFormat:@"QEMU %s - (Press ctrl + alt to release Mouse)", qemu_name]];
+            [normalWindow setTitle:[NSString stringWithFormat:@"QEMU %s - (Press ctrl + alt + g to release Mouse)", qemu_name]];
         else
-            [normalWindow setTitle:@"QEMU - (Press ctrl + alt to release Mouse)"];
+            [normalWindow setTitle:@"QEMU - (Press ctrl + alt + g to release Mouse)"];
     }
     [self hideCursor];
     if (!isAbsoluteEnabled) {