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Adds support for having multiple interface state delegates. (#979)
* Adds support for having multiple interface state delegates. Hopefully in a performant way. * Switch to respondsToSelector for int del instead of separate object * Add CHANGELOG * Make ASDisplayNode+InterfaceState.h public * Huy's comments * Don't even bother removing since it's a weak hash table.
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| // | ||
| // ASDisplayNode+InterfaceState.h | ||
| // Texture | ||
| // | ||
| // Copyright (c) 2017-present, Pinterest, Inc. All rights reserved. | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
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| /** | ||
| * 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 loading, display, and visibility (the latter for animations or other onscreen-only effects). | ||
| * | ||
| * The defualt state, ASInterfaceStateNone, means that the element is not predicted to be onscreen soon and | ||
| * preloading should not be performed. Swift: use [] for the default behavior. | ||
| */ | ||
| typedef NS_OPTIONS(NSUInteger, ASInterfaceState) | ||
| { | ||
| /** The element is not predicted to be onscreen soon and preloading should not be performed */ | ||
| ASInterfaceStateNone = 0, | ||
| /** The element may be added to a view soon that could become visible. Measure the layout, including size calculation. */ | ||
| ASInterfaceStateMeasureLayout = 1 << 0, | ||
| /** The element is likely enough to come onscreen that disk and/or network data required for display should be fetched. */ | ||
| ASInterfaceStatePreload = 1 << 1, | ||
| /** The element is very likely to become visible, and concurrent rendering should be executed for any -setNeedsDisplay. */ | ||
| ASInterfaceStateDisplay = 1 << 2, | ||
| /** 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 << 3, | ||
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| /** | ||
| * The node is not contained in a cell but it is in a window. | ||
| * | ||
| * Currently we only set `interfaceState` to other values for | ||
| * nodes contained in table views or collection views. | ||
| */ | ||
| ASInterfaceStateInHierarchy = ASInterfaceStateMeasureLayout | ASInterfaceStatePreload | ASInterfaceStateDisplay | ASInterfaceStateVisible, | ||
| }; | ||
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| @protocol ASInterfaceStateDelegate <NSObject> | ||
| @optional | ||
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| /** | ||
| * @abstract Called whenever any bit in the ASInterfaceState bitfield is changed. | ||
| * @discussion Subclasses may use this to monitor when they become visible, should free cached data, and much more. | ||
| * @see ASInterfaceState | ||
| */ | ||
| - (void)interfaceStateDidChange:(ASInterfaceState)newState fromState:(ASInterfaceState)oldState; | ||
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| /** | ||
| * @abstract Called whenever the node becomes visible. | ||
| * @discussion Subclasses may use this to monitor when they become visible. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)didEnterVisibleState; | ||
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| /** | ||
| * @abstract Called whenever the node is no longer visible. | ||
| * @discussion Subclasses may use this to monitor when they are no longer visible. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)didExitVisibleState; | ||
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| /** | ||
| * @abstract Called whenever the the node has entered the display state. | ||
| * @discussion Subclasses may use this to monitor when a node should be rendering its content. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)didEnterDisplayState; | ||
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| /** | ||
| * @abstract Called whenever the the node has exited the display state. | ||
| * @discussion Subclasses may use this to monitor when a node should no longer be rendering its content. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)didExitDisplayState; | ||
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| /** | ||
| * @abstract Called whenever the the node has entered the preload state. | ||
| * @discussion Subclasses may use this to monitor data for a node should be preloaded, either from a local or remote source. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)didEnterPreloadState; | ||
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| /** | ||
| * @abstract Called whenever the the node has exited the preload state. | ||
| * @discussion Subclasses may use this to monitor whether preloading data for a node should be canceled. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)didExitPreloadState; | ||
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| /** | ||
| * @abstract Called when the node has completed applying the layout. | ||
| * @discussion Can be used for operations that are performed after layout has completed. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)nodeDidLayout; | ||
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| /** | ||
| * @abstract Called when the node loads. | ||
| * @discussion Can be used for operations that are performed after the node's view is available. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)nodeDidLoad; | ||
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| /** | ||
| * @abstract Indicates that the receiver and all subnodes have finished displaying. | ||
| * @discussion May be called more than once, for example if the receiver has a network image node. | ||
| * This is called after the first display pass even if network image nodes have not downloaded anything | ||
| * (text would be done, and other nodes that are ready to do their final display). Each render of | ||
| * every progressive jpeg network node would cause this to be called, so this hook could be called up to | ||
| * 1 + (pJPEGcount * pJPEGrenderCount) times. The render count depends on how many times the downloader calls | ||
| * the progressImage block. | ||
| * @note This method is guaranteed to be called on main. | ||
| */ | ||
| - (void)hierarchyDisplayDidFinish; | ||
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| @end |
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