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9e76d7b603
- Also make sure a transition isn't invalidated right after it passed the validation test and before it proceeds
107 lines
4.3 KiB
Objective-C
107 lines
4.3 KiB
Objective-C
/* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "ASContextTransitioning.h"
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ASDISPLAYNODE_EXTERN_C_BEGIN
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void ASPerformBlockOnMainThread(void (^block)());
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void ASPerformBlockOnBackgroundThread(void (^block)()); // DISPATCH_QUEUE_PRIORITY_DEFAULT
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ASDISPLAYNODE_EXTERN_C_END
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@interface ASDisplayNode (Beta)
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+ (BOOL)usesImplicitHierarchyManagement;
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+ (void)setUsesImplicitHierarchyManagement:(BOOL)enabled;
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/** @name Layout */
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/**
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* @abstract Recursively ensures node and all subnodes are displayed.
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* @see Full documentation in ASDisplayNode+FrameworkPrivate.h
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*/
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- (void)recursivelyEnsureDisplaySynchronously:(BOOL)synchronously;
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/**
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* @abstract allow modification of a context before the node's content is drawn
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*
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* @discussion Set the block to be called after the context has been created and before the node's content is drawn.
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* You can override this to modify the context before the content is drawn. You are responsible for saving and
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* restoring context if necessary. Restoring can be done in contextDidDisplayNodeContent
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* This block can be called from *any* thread and it is unsafe to access any UIKit main thread properties from it.
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*/
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@property (nonatomic, strong) ASDisplayNodeContextModifier willDisplayNodeContentWithRenderingContext;
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/**
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* @abstract allow modification of a context after the node's content is drawn
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*/
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@property (nonatomic, strong) ASDisplayNodeContextModifier didDisplayNodeContentWithRenderingContext;
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/** @name Layout Transitioning */
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@property (nonatomic) BOOL usesImplicitHierarchyManagement;
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/**
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* @discussion A place to perform your animation. New nodes have been inserted here. You can also use this time to re-order the hierarchy.
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*/
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- (void)animateLayoutTransition:(id<ASContextTransitioning>)context;
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/**
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* @discussion A place to clean up your nodes after the transition
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*/
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- (void)didCompleteLayoutTransition:(id<ASContextTransitioning>)context;
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/**
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* @abstract Transitions the current layout with a new constrained size. Must be called on main thread.
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*
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* @param animated Animation is optional, but will still proceed through your `animateLayoutTransition` implementation with `isAnimated == NO`.
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*
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* @param shouldMeasureAsync Measure the layout asynchronously.
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*
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* @param measurementCompletion Optional completion block called only if a new layout is calculated.
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* It is called on main, right after the measurement and before -animateLayoutTransition:.
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*
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* @discussion If the passed constrainedSize is the the same as the node's current constrained size, this method is noop.
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*
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* @see animateLayoutTransition:
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*/
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- (void)transitionLayoutWithSizeRange:(ASSizeRange)constrainedSize
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animated:(BOOL)animated
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shouldMeasureAsync:(BOOL)shouldMeasureAsync
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measurementCompletion:(void(^)())completion;
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/**
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* @abstract Invalidates the current layout and begins a relayout of the node with the current `constrainedSize`. Must be called on main thread.
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*
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* @param animated Animation is optional, but will still proceed through your `animateLayoutTransition` implementation with `isAnimated == NO`.
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*
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* @param shouldMeasureAsync Measure the layout asynchronously.
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*
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* @param measurementCompletion Optional completion block called only if a new layout is calculated.
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* It is called right after the measurement and before -animateLayoutTransition:.
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*
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* @see animateLayoutTransition:
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*/
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- (void)transitionLayoutWithAnimation:(BOOL)animated
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shouldMeasureAsync:(BOOL)shouldMeasureAsync
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measurementCompletion:(void(^)())completion;
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/**
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* @abstract Currently used by ASNetworkImageNode and ASMultiplexImageNode to allow their placeholders to stay if they are loading an image from the network.
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* Otherwise, a display pass is scheduled and completes, but does not actually draw anything - and ASDisplayNode considers the element finished.
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*/
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- (BOOL)placeholderShouldPersist;
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/**
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* @abstract Cancels all performing layout transitions. Can be called on any thread.
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*/
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- (void)cancelLayoutTransitionsInProgress;
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@end
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