93 lines
3.3 KiB
Objective-C
93 lines
3.3 KiB
Objective-C
#import "MLNSource.h"
|
||
|
||
#include <memory>
|
||
|
||
NS_ASSUME_NONNULL_BEGIN
|
||
|
||
@protocol MLNStylable;
|
||
|
||
namespace mbgl {
|
||
namespace style {
|
||
class Source;
|
||
}
|
||
} // namespace mbgl
|
||
|
||
// A struct to be stored in the `peer` member of mbgl::style::Source, in order to implement
|
||
// object identity. We don't store a MLNSource pointer directly because that doesn't
|
||
// interoperate with ARC. The inner pointer is weak in order to avoid a reference cycle for
|
||
// "pending" MLNSources, which have a strong owning pointer to the mbgl::style::Source.
|
||
struct SourceWrapper {
|
||
__weak MLNSource *source;
|
||
};
|
||
|
||
/**
|
||
Assert that the style source is valid.
|
||
|
||
This macro should be used at the beginning of any public-facing instance method
|
||
of ``MLNSource`` and its subclasses. For private methods, an assertion is more appropriate.
|
||
*/
|
||
#define MLNAssertStyleSourceIsValid() \
|
||
do { \
|
||
if (!self.rawSource) { \
|
||
[NSException raise:MLNInvalidStyleSourceException \
|
||
format:@"This source got invalidated after the style change"]; \
|
||
} \
|
||
} while (NO);
|
||
|
||
@class MLNMapView;
|
||
|
||
@interface MLNSource (Private)
|
||
|
||
/**
|
||
Initializes and returns a source with a raw pointer to the backing store,
|
||
associated with a style.
|
||
*/
|
||
- (instancetype)initWithRawSource:(mbgl::style::Source *)rawSource
|
||
stylable:(nullable id<MLNStylable>)stylable;
|
||
|
||
/**
|
||
Initializes and returns a source with an owning pointer to the backing store,
|
||
unassociated from a style.
|
||
*/
|
||
- (instancetype)initWithPendingSource:(std::unique_ptr<mbgl::style::Source>)pendingSource;
|
||
|
||
/**
|
||
A raw pointer to the mbgl object, which is always initialized, either to the
|
||
value returned by `mbgl::Map getSource`, or for independently created objects,
|
||
to the pointer value held in `pendingSource`. In the latter case, this raw
|
||
pointer value stays even after ownership of the object is transferred via
|
||
`mbgl::Map addSource`.
|
||
*/
|
||
@property (nonatomic, readonly) mbgl::style::Source *rawSource;
|
||
|
||
/**
|
||
The stylable object whose style currently contains the source.
|
||
|
||
If the source is not currently part of any stylable object’s style, this
|
||
property is set to `nil`.
|
||
*/
|
||
@property (nonatomic, readonly, weak) id<MLNStylable> stylable;
|
||
|
||
/**
|
||
Adds the mbgl source that this object represents to the mbgl map.
|
||
Once a mbgl source is added, ownership of the object is transferred to the
|
||
`mbgl::Map` and this object no longer has an active unique_ptr reference to the
|
||
`mbgl::Source`. If this object's mbgl source is in that state, the mbgl source
|
||
can still be changed but the changes will not be visible until the ``MLNSource``
|
||
is added back to the map via ``MLNStyle/addSource:`` and styled with a
|
||
``MLNLayer``.
|
||
*/
|
||
- (void)addToStylable:(id<MLNStylable>)mapView;
|
||
|
||
/**
|
||
Removes the mbgl source that this object represents from the mbgl map.
|
||
When a mbgl source is removed, ownership of the object is transferred back
|
||
to the ``MLNSource`` instance and the unique_ptr reference is valid again. It is
|
||
safe to add the source back to the style after it is removed.
|
||
*/
|
||
- (BOOL)removeFromStylable:(id<MLNStylable>)mapView error:(NSError *__nullable *__nullable)outError;
|
||
|
||
@end
|
||
|
||
NS_ASSUME_NONNULL_END
|