[ios, macos] Deprecate -[MGLMapViewDelegate mapView:alphaForShapeAnnotation:] (#6706)

4 files changed, 21 insertions, 13 deletions

diff --git a/platform/macos/CHANGELOG.md b/platform/macos/CHANGELOG.md
index 9e5b861e82..5049a3aae8 100644
--- a/platform/macos/CHANGELOG.md
+++ b/platform/macos/CHANGELOG.md
@@ -30,6 +30,7 @@
 * Database errors are now logged to the console. ([#6291](https://github.com/mapbox/mapbox-gl-native/pull/6291))
 * Improved style parsing performance. ([#6170](https://github.com/mapbox/mapbox-gl-native/pull/6170))
 * Fixed a typo in the documentation for the MGLCompassDirectionFormatter class. ([#5879](https://github.com/mapbox/mapbox-gl-native/pull/5879))
+* Deprecated `-[MGLMapViewDelegate mapView:alphaForShapeAnnotation:]` in favor of specifying an alpha component via `-[MGLMapViewDelegate mapView:strokeColorForShapeAnnotation:]` or `-[MGLMapViewDelegate mapView:fillColorForPolygonAnnotation:]`. ([#6706](https://github.com/mapbox/mapbox-gl-native/pull/6706))
 
 ## 0.2.1 - July 19, 2016
 
diff --git a/platform/macos/app/MapDocument.m b/platform/macos/app/MapDocument.m
index 9c3abc1a1e..505678fcc2 100644
--- a/platform/macos/app/MapDocument.m
+++ b/platform/macos/app/MapDocument.m
@@ -826,8 +826,9 @@ NS_ARRAY_OF(id <MGLAnnotation>) *MBXFlattenedShapes(NS_ARRAY_OF(id <MGLAnnotatio
     }
 }
 
-- (CGFloat)mapView:(MGLMapView *)mapView alphaForShapeAnnotation:(MGLShape *)annotation {
-    return 0.8;
+- (NSColor *)mapView:(MGLMapView *)mapView fillColorForPolygonAnnotation:(MGLPolygon *)annotation {
+    NSColor *color = [[NSColor selectedMenuItemColor] colorUsingColorSpaceName:NSCalibratedRGBColorSpace];
+    return [color colorWithAlphaComponent:0.8];
 }
 
 @end
diff --git a/platform/macos/src/MGLMapView.mm b/platform/macos/src/MGLMapView.mm
index 2031173509..bd03af509d 100644
--- a/platform/macos/src/MGLMapView.mm
+++ b/platform/macos/src/MGLMapView.mm
@@ -2163,8 +2163,18 @@ public:
 #pragma mark MGLMultiPointDelegate methods
 
 - (double)alphaForShapeAnnotation:(MGLShape *)annotation {
+    // The explicit -mapView:alphaForShapeAnnotation: delegate method is deprecated
+    // but still used, if implemented. When not implemented, call the stroke or
+    // fill color delegate methods and pull the alpha from the returned color.
     if (_delegateHasAlphasForShapeAnnotations) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
         return [self.delegate mapView:self alphaForShapeAnnotation:annotation];
+#pragma clang diagnostic pop
+    } else if ([annotation isKindOfClass:[MGLPolygon class]]) {
+        return [self fillColorForPolygonAnnotation:(MGLPolygon *)annotation].a ?: 1.0;
+    } else if ([annotation isKindOfClass:[MGLShape class]]) {
+        return [self strokeColorForShapeAnnotation:annotation].a ?: 1.0;
     }
     return 1.0;
 }
diff --git a/platform/macos/src/MGLMapViewDelegate.h b/platform/macos/src/MGLMapViewDelegate.h
index c946624f11..c5af93f8ad 100644
--- a/platform/macos/src/MGLMapViewDelegate.h
+++ b/platform/macos/src/MGLMapViewDelegate.h
@@ -156,17 +156,7 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (nullable MGLAnnotationImage *)mapView:(MGLMapView *)mapView imageForAnnotation:(id <MGLAnnotation>)annotation;
 
-/**
- Returns the alpha value to use when rendering a shape annotation.
- 
- A value of 0.0 results in a completely transparent shape. A value of 1.0, the
- default, results in a completely opaque shape.
- 
- @param mapView The map view rendering the shape annotation.
- @param annotation The annotation being rendered.
- @return An alpha value between 0 and 1.0.
- */
-- (CGFloat)mapView:(MGLMapView *)mapView alphaForShapeAnnotation:(MGLShape *)annotation;
+- (CGFloat)mapView:(MGLMapView *)mapView alphaForShapeAnnotation:(MGLShape *)annotation __attribute__((deprecated("Use -mapView:strokeColorForShapeAnnotation: or -mapView:fillColorForPolygonAnnotation:.")));
 
 /**
  Returns the color to use when rendering the outline of a shape annotation.
@@ -174,6 +164,9 @@ NS_ASSUME_NONNULL_BEGIN
  The default stroke color is the selected menu item color. If a pattern color is
  specified, the result is undefined.
  
+ Opacity may be set by specifying an alpha component. The default alpha value is
+ `1.0` and results in a completely opaque stroke.
+ 
  @param mapView The map view rendering the shape annotation.
  @param annotation The annotation being rendered.
  @return A color to use for the shape outline.
@@ -186,6 +179,9 @@ NS_ASSUME_NONNULL_BEGIN
  The default fill color is the selected menu item color. If a pattern color is
  specified, the result is undefined.
  
+ Opacity may be set by specifying an alpha component. The default alpha value is
+ `1.0` and results in a completely opaque shape.
+ 
  @param mapView The map view rendering the polygon annotation.
  @param annotation The annotation being rendered.
  @return The polygon’s interior fill color.