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Introduce ASInterfaceState on ASDisplayNode.

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Later, this will be added to ASViewController.  Right now it is not hooked up to drive anything.
It will become the codepath that drives calls like -fetchData and -clearContents.
This commit is contained in:
Scott Goodson
2015-11-16 11:36:10 -08:00
parent bd4b8601ba
commit ff0e94b4e1
3 changed files with 36 additions and 0 deletions
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22
AsyncDisplayKit/ASDisplayNode.h
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@@ -32,6 +32,27 @@ typedef CALayer *(^ASDisplayNodeLayerBlock)();
*/
typedef void (^ASDisplayNodeDidLoadBlock)(ASDisplayNode *node);
/**
Interface state is available on ASDisplayNode and ASViewController, and
allows checking whether a node is in an interface situation where it is prudent to trigger certain
actions: measurement, data fetching, display, and visibility (the latter for animations or other onscreen-only effects).
*/
typedef NS_OPTIONS(NSUInteger, ASInterfaceState)
{
/** The element is not predicted to be onscreen soon and preloading should not be performed */
ASInterfaceStateNone = 1 << 0,
/** The element may be added to a view soon that could become visible. Measure the layout, including size calculation. */
ASInterfaceStateMeasureLayout = 1 << 1,
/** The element is likely enough to come onscreen that disk and/or network data required for display should be fetched. */
ASInterfaceStateFetchData = 1 << 2,
/** The elemant is very likely to become visible, and concurrent rendering should be executed for any -setNeedsDisplay. */
ASInterfaceStateDisplay = 1 << 3,
/** The element is physically onscreen by at least 1 pixel.
In practice, all other bit fields should also be set when this flag is set. */
ASInterfaceStateVisible = 1 << 4,
};
/**
* An `ASDisplayNode` is an abstraction over `UIView` and `CALayer` that allows you to perform calculations about a view
* hierarchy off the main thread, and could do rendering off the main thread as well.
@@ -160,6 +181,7 @@ typedef void (^ASDisplayNodeDidLoadBlock)(ASDisplayNode *node);
*/
@property (nonatomic, readonly, retain) CALayer *layer;
@property (nonatomic, readwrite) ASInterfaceState interfaceState;
/** @name Managing dimensions */