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.
This converts the style property classes (CirclePaintProperties and so on) to the same tuple-based approach as gl::Attribute and gl::Uniform. The approach is outlined in https://github.com/mapbox/cpp/blob/master/C%2B%2B%20Structural%20Metaprogramming.md.
The main advantage of this approach is it allows writing algorithms that work on sets of style properties, without resorting to code generation or manually repetitive code. This lets us iterate on approaches to data-driven properties more easily.
Another advantage is that the cascading, unevaluated, and evaluated states of a set of properties exist as independent structures, instead of individual properties holding their own state. This is a more functional approach that makes data flow clearer and reduces state.
When a source or layer is removed transfer ownership back to the
caller so it can (optionally) take it. Preserve the behavior that
removing a CustomLayer triggers deinitialization. Deinitialize all
custom layers when a style is destroyed in case those layers are not
explicitly removed.
When a source or layer is removed transfer ownership back to the
caller so it can (optionally) take it. Preserve the behavior that
removing a CustomLayer triggers deinitialization. Deinitialize all
custom layers when a style is destroyed in case those layers are not
explicitly removed.
Otherwise, it can participate in unexpected conversions. Case in point: GlyphSet::insert was comparing the result of GlyphMetrics::operator bool() where it wanted to use operator==.
Implemented observer callbacks so the style knows when the source’s attribution changes and the map knows when the style’s attribution changes. Also implemented a getter for a tile source’s attribution.
Fixes#2723.
