1 files changed, 48 insertions, 0 deletions
diff --git a/platform/macos/app/MapDocument.m b/platform/macos/app/MapDocument.m
index 03557caca2..23bc652229 100644
--- a/platform/macos/app/MapDocument.m
+++ b/platform/macos/app/MapDocument.m
@@ -641,6 +641,51 @@ NS_ARRAY_OF(id <MGLAnnotation>) *MBXFlattenedShapes(NS_ARRAY_OF(id <MGLAnnotatio
                                     repeats:YES];
 }
 
+
+- (id<MGLAnnotation>)randomOffscreenPointAnnotation {
+
+    NSPredicate *pointAnnotationPredicate = [NSPredicate predicateWithBlock:^BOOL(id  _Nullable evaluatedObject, NSDictionary<NSString *,id> * _Nullable bindings) {
+        return [evaluatedObject isKindOfClass:[MGLPointAnnotation class]];
+    }];
+
+    NSArray *annotations = [self.mapView.annotations filteredArrayUsingPredicate:pointAnnotationPredicate];
+
+    if (annotations.count == 0) {
+        return nil;
+    }
+
+    // NOTE: self.mapView.visibleAnnotations occasionally returns nil - see
+    // https://github.com/mapbox/mapbox-gl-native/issues/11296
+    NSArray *visibleAnnotations = [self.mapView.visibleAnnotations filteredArrayUsingPredicate:pointAnnotationPredicate];
+
+    NSLog(@"Number of visible point annotations = %ld", visibleAnnotations.count);
+
+    if (visibleAnnotations.count == annotations.count) {
+        return nil;
+    }
+
+    NSMutableArray *invisibleAnnotations = [annotations mutableCopy];
+
+    if (visibleAnnotations.count > 0) {
+        [invisibleAnnotations removeObjectsInArray:visibleAnnotations];
+    }
+
+    // Now pick a random offscreen annotation.
+    uint32_t index = arc4random_uniform((uint32_t)invisibleAnnotations.count);
+    return invisibleAnnotations[index];
+}
+
+- (IBAction)selectOffscreenPointAnnotation:(id)sender {
+    id<MGLAnnotation> annotation = [self randomOffscreenPointAnnotation];
+    if (annotation) {
+        [self.mapView selectAnnotation:annotation];
+
+        // Alternative method to select the annotation. These two should do the same thing.
+        //     self.mapView.selectedAnnotations = @[annotation];
+        NSAssert(self.mapView.selectedAnnotations.firstObject, @"The annotation was not selected");
+    }
+}
+
 - (void)updateAnimatedAnnotation:(NSTimer *)timer {
     DroppedPinAnnotation *annotation = timer.userInfo;
     double angle = timer.fireDate.timeIntervalSinceReferenceDate;
@@ -1111,6 +1156,9 @@ NS_ARRAY_OF(id <MGLAnnotation>) *MBXFlattenedShapes(NS_ARRAY_OF(id <MGLAnnotatio
     if (menuItem.action == @selector(insertGraticuleLayer:)) {
         return ![self.mapView.style sourceWithIdentifier:@"graticule"];
     }
+    if (menuItem.action == @selector(selectOffscreenPointAnnotation:)) {
+        return YES;
+    }
     if (menuItem.action == @selector(showAllAnnotations:) || menuItem.action == @selector(removeAllAnnotations:)) {
         return self.mapView.annotations.count > 0;
     }