[core, ios, macos] Added layers and sources properties to MGLStyle

Added new layers and sources properties to MGLStyle that contain all the style’s layers and sources, respectively. These properties are KVC-compliant with all the mutable to-many methods. Layers are ordered from topmost to bottommost, for consistency with Cocoa APIs where front/first means top and back/last means bottom.

Also added storage for mbgl::style::Source in MGLSource proper for wrapping AnnotationSource. Until the style finishes loading, its name property is set to nil.

Fixes #6003.

1 files changed, 9 insertions, 1 deletions

diff --git a/src/mbgl/map/map.cpp b/src/mbgl/map/map.cpp
index bd1de6f180..68c20a3132 100644
--- a/src/mbgl/map/map.cpp
+++ b/src/mbgl/map/map.cpp
@@ -803,6 +803,10 @@ AnnotationIDs Map::queryPointAnnotations(const ScreenBox& box) {
 
 #pragma mark - Style API
 
+std::vector<style::Source*> Map::getSources() {
+    return impl->style ? impl->style->getSources() : std::vector<style::Source*>();
+}
+
 style::Source* Map::getSource(const std::string& sourceID) {
     if (impl->style) {
         impl->styleMutated = true;
@@ -825,8 +829,12 @@ std::unique_ptr<Source> Map::removeSource(const std::string& sourceID) {
     }
     return nullptr;
 }
+    
+std::vector<style::Layer*> Map::getLayers() {
+    return impl->style ? impl->style->getLayers() : std::vector<style::Layer*>();
+}
 
-style::Layer* Map::getLayer(const std::string& layerID) {
+Layer* Map::getLayer(const std::string& layerID) {
     if (impl->style) {
         impl->styleMutated = true;
         return impl->style->getLayer(layerID);