From 8f5e7d2126c47b106e89462d93677aa8a9182e21 Mon Sep 17 00:00:00 2001
From: Fabian Guerra <fabian.guerra@mapbox.com>
Date: Wed, 12 Dec 2018 14:52:18 -0800
Subject: [ios, macos] Add enablePlacementTransitions to MGLStyle.

---
 platform/darwin/src/MGLStyle.h        |  7 +++++++
 platform/darwin/src/MGLStyle.mm       | 13 +++++++++++++
 platform/darwin/test/MGLStyleTests.mm | 20 ++++++++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/platform/darwin/src/MGLStyle.h b/platform/darwin/src/MGLStyle.h
index 7621db0ad5..2b2f0998d4 100644
--- a/platform/darwin/src/MGLStyle.h
+++ b/platform/darwin/src/MGLStyle.h
@@ -270,6 +270,13 @@ MGL_EXPORT
  */
 @property (nonatomic) MGLTransition transition;
 
+/**
+ A boolean value indicating whether label placement transitions are enabled.
+ 
+ The default value of this property is `YES`.
+ */
+@property (nonatomic, assign) BOOL enablePlacementTransitions;
+
 /**
  Returns a source with the given identifier in the current style.
 
diff --git a/platform/darwin/src/MGLStyle.mm b/platform/darwin/src/MGLStyle.mm
index df5f51102a..82fed5e922 100644
--- a/platform/darwin/src/MGLStyle.mm
+++ b/platform/darwin/src/MGLStyle.mm
@@ -534,6 +534,19 @@ static_assert(6 == mbgl::util::default_styles::numOrderedStyles,
     return MGLTransitionFromOptions(transitionOptions);
 }
 
+- (void)setEnablePlacementTransitions:(BOOL)enablePlacementTransitions
+{
+    mbgl::style::TransitionOptions transitionOptions = self.rawStyle->getTransitionOptions();
+    transitionOptions.enablePlacementTransitions = static_cast<bool>(enablePlacementTransitions);
+    self.rawStyle->setTransitionOptions(transitionOptions);
+}
+
+- (BOOL)enablePlacementTransitions
+{
+    mbgl::style::TransitionOptions transitionOptions = self.rawStyle->getTransitionOptions();
+    return transitionOptions.enablePlacementTransitions;
+}
+
 #pragma mark Style light
 
 - (void)setLight:(MGLLight *)light
diff --git a/platform/darwin/test/MGLStyleTests.mm b/platform/darwin/test/MGLStyleTests.mm
index 7330477126..ff075f63a6 100644
--- a/platform/darwin/test/MGLStyleTests.mm
+++ b/platform/darwin/test/MGLStyleTests.mm
@@ -470,4 +470,24 @@
     }
 }
 
+#pragma mark Transition tests
+
+- (void)testTransition
+{
+    MGLTransition transitionTest = MGLTransitionMake(5, 4);
+    
+    self.style.transition = transitionTest;
+    
+    XCTAssert(self.style.transition.delay == transitionTest.delay);
+    XCTAssert(self.style.transition.duration == transitionTest.duration);
+}
+
+- (void)testEnablePlacementTransition
+{
+    XCTAssertTrue(self.style.enablePlacementTransitions, @"The default value for enabling placement transitions should be YES.");
+    
+    self.style.enablePlacementTransitions = NO;
+    XCTAssertFalse(self.style.enablePlacementTransitions, @"Enabling placement transitions should be NO.");
+}
+
 @end
-- 
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