1 files changed, 68 insertions, 0 deletions
diff --git a/platform/macos/app/DroppedPinAnnotation.m b/platform/macos/app/DroppedPinAnnotation.m
new file mode 100644
index 0000000000..5b19fd7401
--- /dev/null
+++ b/platform/macos/app/DroppedPinAnnotation.m
@@ -0,0 +1,68 @@
+#import "DroppedPinAnnotation.h"
+
+#import "LocationCoordinate2DTransformer.h"
+#import "TimeIntervalTransformer.h"
+
+#import <Mapbox/Mapbox.h>
+
+static MGLCoordinateFormatter *DroppedPinCoordinateFormatter;
+
+@implementation DroppedPinAnnotation {
+    NSTimer *_timer;
+    NSTimeInterval _priorShownTimeInterval;
+    NSDate *_dateShown;
+    
+    NSValueTransformer *_timeIntervalTransformer;
+}
+
++ (void)initialize {
+    if (self == [DroppedPinAnnotation class]) {
+        DroppedPinCoordinateFormatter = [[MGLCoordinateFormatter alloc] init];
+    }
+}
+
+- (instancetype)init {
+    if (self = [super init]) {
+        _timeIntervalTransformer = [NSValueTransformer valueTransformerForName:
+                                    NSStringFromClass([TimeIntervalTransformer class])];
+        [self update:nil];
+    }
+    return self;
+}
+
+- (void)dealloc {
+    [self pause];
+}
+
+- (void)setCoordinate:(CLLocationCoordinate2D)coordinate {
+    super.coordinate = coordinate;
+    [self update:nil];
+}
+
+- (NSTimeInterval)elapsedShownTime {
+    return _priorShownTimeInterval - _dateShown.timeIntervalSinceNow;
+}
+
+- (void)resume {
+    _dateShown = [NSDate date];
+    _timer = [NSTimer scheduledTimerWithTimeInterval:1
+                                              target:self
+                                            selector:@selector(update:)
+                                            userInfo:nil
+                                             repeats:YES];
+}
+
+- (void)pause {
+    [_timer invalidate];
+    _timer = nil;
+    _priorShownTimeInterval -= _dateShown.timeIntervalSinceNow;
+    _dateShown = nil;
+}
+
+- (void)update:(NSTimer *)timer {
+    NSString *coordinate = [DroppedPinCoordinateFormatter stringFromCoordinate:self.coordinate];
+    NSString *elapsedTime = [_timeIntervalTransformer transformedValue:@(self.elapsedShownTime)];
+    self.subtitle = [NSString stringWithFormat:@"%@\nSelected for %@", coordinate, elapsedTime];
+}
+
+@end