[PATCH 2/2] ui/cocoa.m: Add ability to swap command/meta and options keys

[John Arbuckle <programmingkidx@gmail.com>]

For users who are use to using a Macintosh keyboard having to use a PC keyboard
can be a pain because the Command/meta and Option/Alt keys are switched. To
make life easier this option is added to allow the user to switch how the guest
reacts to each of these keys being pushed. It can make a Macintosh keyboard user
feel almost at home with a PC keyboard. The same could be said for PC keyboard
users who have to use a Macinosh keyboard.
Based on patch by Gustavo Noronha Silva <gustavo@noronha.dev.br>.

Signed-off-by: John Arbuckle <programmingkidx@gmail.com>
---
 ui/cocoa.m | 66 +++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 58 insertions(+), 8 deletions(-)

diff --git a/ui/cocoa.m b/ui/cocoa.m
index fdef9e9901..98596d5f38 100644
--- a/ui/cocoa.m
+++ b/ui/cocoa.m
@@ -116,6 +116,7 @@ static void cocoa_switch(DisplayChangeListener *dcl,
 
 static CFMachPortRef eventsTap = NULL;
 static CFRunLoopSourceRef eventsTapSource = NULL;
+static bool swap_command_option_keys = false;
 
 static void with_iothread_lock(CodeBlock block)
 {
@@ -810,12 +811,22 @@ - (bool) handleEventLocked:(NSEvent *)event
         qkbd_state_key_event(kbd, Q_KEY_CODE_CTRL_R, false);
     }
     if (!(modifiers & NSEventModifierFlagOption)) {
-        qkbd_state_key_event(kbd, Q_KEY_CODE_ALT, false);
-        qkbd_state_key_event(kbd, Q_KEY_CODE_ALT_R, false);
+        if (swap_command_option_keys) {
+            qkbd_state_key_event(kbd, Q_KEY_CODE_META_L, false);
+            qkbd_state_key_event(kbd, Q_KEY_CODE_META_R, false);
+        } else {
+            qkbd_state_key_event(kbd, Q_KEY_CODE_ALT, false);
+            qkbd_state_key_event(kbd, Q_KEY_CODE_ALT_R, false);
+        }
     }
     if (!(modifiers & NSEventModifierFlagCommand)) {
-        qkbd_state_key_event(kbd, Q_KEY_CODE_META_L, false);
-        qkbd_state_key_event(kbd, Q_KEY_CODE_META_R, false);
+        if (swap_command_option_keys) {
+            qkbd_state_key_event(kbd, Q_KEY_CODE_ALT, false);
+            qkbd_state_key_event(kbd, Q_KEY_CODE_ALT_R, false);
+        } else {
+            qkbd_state_key_event(kbd, Q_KEY_CODE_META_L, false);
+            qkbd_state_key_event(kbd, Q_KEY_CODE_META_R, false);
+        }
     }
 
     switch ([event type]) {
@@ -847,13 +858,22 @@ - (bool) handleEventLocked:(NSEvent *)event
 
                 case kVK_Option:
                     if (!!(modifiers & NSEventModifierFlagOption)) {
-                        [self toggleKey:Q_KEY_CODE_ALT];
+                        if (swap_command_option_keys) {
+                            [self toggleKey:Q_KEY_CODE_META_L];
+                        } else {
+                            [self toggleKey:Q_KEY_CODE_ALT];
+                        }
+
                     }
                     break;
 
                 case kVK_RightOption:
                     if (!!(modifiers & NSEventModifierFlagOption)) {
-                        [self toggleKey:Q_KEY_CODE_ALT_R];
+                        if (swap_command_option_keys) {
+                            [self toggleKey:Q_KEY_CODE_META_R];
+                        } else {
+                            [self toggleKey:Q_KEY_CODE_ALT_R];
+                        }
                     }
                     break;
 
@@ -861,14 +881,22 @@ - (bool) handleEventLocked:(NSEvent *)event
                 case kVK_Command:
                     if (isMouseGrabbed &&
                         !!(modifiers & NSEventModifierFlagCommand)) {
-                        [self toggleKey:Q_KEY_CODE_META_L];
+                        if (swap_command_option_keys) {
+                            [self toggleKey:Q_KEY_CODE_ALT];
+                        } else {
+                            [self toggleKey:Q_KEY_CODE_META_L];
+                        }
                     }
                     break;
 
                 case kVK_RightCommand:
                     if (isMouseGrabbed &&
                         !!(modifiers & NSEventModifierFlagCommand)) {
-                        [self toggleKey:Q_KEY_CODE_META_R];
+                        if (swap_command_option_keys) {
+                            [self toggleKey:Q_KEY_CODE_ALT_R];
+                        } else {
+                            [self toggleKey:Q_KEY_CODE_META_R];
+                        }
                     }
                     break;
             }
@@ -1188,6 +1216,7 @@ - (IBAction) do_about_menu_item: (id) sender;
 - (void)make_about_window;
 - (void)adjustSpeed:(id)sender;
 - (IBAction)doFullGrab:(id)sender;
+- (IBAction)doSwapCommandOptionKeys:(id)sender;
 @end
 
 @implementation QemuCocoaAppController
@@ -1669,6 +1698,22 @@ - (IBAction)doFullGrab:(id) sender
     }
 }
 
+// The action method to the "Options->Swap Command and Option Keys" menu item
+- (IBAction)doSwapCommandOptionKeys:(id)sender
+{
+    // If the menu item is not checked
+    if ([sender state] == NSControlStateValueOff) {
+        swap_command_option_keys = true;
+        [sender setState: NSControlStateValueOn];
+    }
+
+    // If the menu item is checked
+    else {
+        swap_command_option_keys = false;
+        [sender setState: NSControlStateValueOff];
+    }
+}
+
 @end
 
 @interface QemuApplication : NSApplication
@@ -1762,6 +1807,11 @@ static void create_initial_menus(void)
                          @"Full Keyboard Grab" action:@selector(doFullGrab:)
                                         keyEquivalent:@""] autorelease]];
 
+    [menu addItem: [[[NSMenuItem alloc] initWithTitle:
+                                                 @"Swap Command and Option Keys"
+                                               action:@selector(doSwapCommandOptionKeys:)
+                                        keyEquivalent:@""] autorelease]];
+
     menuItem = [[[NSMenuItem alloc] initWithTitle:@"Options" action:nil
                                     keyEquivalent:@""] autorelease];
     [menuItem setSubmenu:menu];
-- 
2.24.3 (Apple Git-128)