Make "Quit" button work on "q" or "Escape" key press

Previously I only had a key equivalent on the "Escape" key because you
can only set a single key equivalent. But I wanted the "Quit" button to
work on both "Escape" and "q" presses.

I tried to do this by overriding `performKeyEquivalent:`:

    - (BOOL)performKeyEquivalent:(NSEvent *)theEvent
    {
        if ([[theEvent characters] isEqualToString:@"q"] ||
            [theEvent keyCode] == kVK_Escape) {
        NSLog(@"%@", theEvent);
            return YES;
        }

        return [super performKeyEquivalent:theEvent];
    }

The method was called and it logged correctly, but the `IBAction`
wouldn't run. Maybe this doesn't work for what I want it to? Can't
figure out what the problem is.

Didn't want to deal any more so just overrode `keyDown:` instead and got
rid of the `IBAction`, just terminating the application in code.

3 files changed, 39 insertions, 7 deletions

diff --git a/CopyMailto/Base.lproj/MainMenu.xib b/CopyMailto/Base.lproj/MainMenu.xib
index 9fd9f26..8b9ca42 100644
--- a/CopyMailto/Base.lproj/MainMenu.xib
+++ b/CopyMailto/Base.lproj/MainMenu.xib
@@ -107,19 +107,13 @@ DQ
                             <action selector="copyEmailToClipboard:" target="Voe-Tx-rLC" id="uX1-7A-IwJ"/>
                         </connections>
                     </button>
-                    <button verticalHuggingPriority="750" misplaced="YES" id="dF9-KQ-ymU">
+                    <button verticalHuggingPriority="750" misplaced="YES" id="dF9-KQ-ymU" customClass="QuitButton">
                         <rect key="frame" x="328" y="13" width="66" height="32"/>
                         <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxY="YES"/>
                         <buttonCell key="cell" type="push" title="Quit" bezelStyle="rounded" alignment="center" borderStyle="border" imageScaling="proportionallyDown" inset="2" id="aJz-qw-lxS">
                             <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
                             <font key="font" metaFont="system"/>
-                            <string key="keyEquivalent" base64-UTF8="YES">
-Gw
-</string>
                         </buttonCell>
-                        <connections>
-                            <action selector="terminate:" target="-1" id="M3t-iK-CjQ"/>
-                        </connections>
                     </button>
                 </subviews>
             </view>
diff --git a/CopyMailto/QuitButton.h b/CopyMailto/QuitButton.h
new file mode 100644
index 0000000..73c2e9d
--- /dev/null
+++ b/CopyMailto/QuitButton.h
@@ -0,0 +1,16 @@
+//
+//  QuitButton.h
+//  CopyMailto
+//
+//  Created by tw on 9/5/18.
+//  Copyright © 2018 tw. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+#import <Carbon/Carbon.h>
+
+@interface QuitButton : NSButton
+
+- (void)keyDown:(NSEvent *)theEvent;
+
+@end
diff --git a/CopyMailto/QuitButton.m b/CopyMailto/QuitButton.m
new file mode 100644
index 0000000..8b8bb52
--- /dev/null
+++ b/CopyMailto/QuitButton.m
@@ -0,0 +1,22 @@
+//
+//  QuitButton.m
+//  CopyMailto
+//
+//  Created by tw on 9/5/18.
+//  Copyright © 2018 tw. All rights reserved.
+//
+
+#import "QuitButton.h"
+
+@implementation QuitButton
+
+// Quit the application on "q" or "Escape"
+- (void)keyDown:(NSEvent *)theEvent
+{
+    if ([[theEvent characters] isEqualToString:@"q"] ||
+        [theEvent keyCode] == kVK_Escape) {
+        [NSApp terminate:self];
+    }
+}
+
+@end