1 files changed, 55 insertions, 0 deletions
diff --git a/platform/macos/src/MGLAttributionButton.mm b/platform/macos/src/MGLAttributionButton.mm
new file mode 100644
index 0000000000..ed8bb18a66
--- /dev/null
+++ b/platform/macos/src/MGLAttributionButton.mm
@@ -0,0 +1,55 @@
+#import "MGLAttributionButton.h"
+#import "MGLAttributionInfo.h"
+
+#import "NSBundle+MGLAdditions.h"
+#import "NSString+MGLAdditions.h"
+
+@implementation MGLAttributionButton
+
+- (instancetype)initWithAttributionInfo:(MGLAttributionInfo *)info {
+    if (self = [super initWithFrame:NSZeroRect]) {
+        self.bordered = NO;
+        self.bezelStyle = NSRegularSquareBezelStyle;
+        
+        // Extract any prefix consisting of intellectual property symbols.
+        NSScanner *scanner = [NSScanner scannerWithString:info.title.string];
+        NSCharacterSet *symbolSet = [NSCharacterSet characterSetWithCharactersInString:@"©℗®℠™ &"];
+        NSString *symbol;
+        [scanner scanCharactersFromSet:symbolSet intoString:&symbol];
+        
+        // Remove the underline from the symbol for aesthetic reasons.
+        NSMutableAttributedString *title = info.title.mutableCopy;
+        [title removeAttribute:NSUnderlineStyleAttributeName range:NSMakeRange(0, symbol.length)];
+        
+        self.attributedTitle = title;
+        [self sizeToFit];
+        
+        _URL = info.URL;
+        if (_URL) {
+            self.toolTip = _URL.absoluteString;
+        }
+        
+        self.target = self;
+        self.action = @selector(openURL:);
+    }
+    return self;
+}
+
+- (BOOL)wantsLayer {
+    return YES;
+}
+
+- (void)resetCursorRects {
+    if (self.URL) {
+        // The whole button gets a pointing hand cursor, just like a hyperlink.
+        [self addCursorRect:self.bounds cursor:[NSCursor pointingHandCursor]];
+    }
+}
+
+- (IBAction)openURL:(__unused id)sender {
+    if (self.URL) {
+        [[NSWorkspace sharedWorkspace] openURL:self.URL];
+    }
+}
+
+@end