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Initial attempt at implementing Display Traits

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Initial attempt to get display traits working with ASEnvironment.

To get proper ASDisplayTraits support, you must use an ASViewController. The ASViewController implements UITraitCollection-related methods (`traitCollectionDidChange:`, `willTransitionToTraitCollection:withTransitionCoordinator:`, viewWillTransitionToSize:withTransitionCoordinator`) to update the internal ASDisplayTraits and propagate them to subnodes.

ASTableNode and ASCollectionNode don't actually have their cells as subnodes, so a little bit of trickery is involved (on `setEnvironment:` the table/collection node gets its data controllers completedNodes and propagates the new traits. see `ASDisplayTraitsCollectionTableSetEnvironmentState`). The data controller also passes the current display traits when creating new cells.

ASViewController also supports the ability to return a custom set of display traits. So if you have a modal dialog that should always be told it is in a compact size class, you can set the override block before displaying the VC.

A new example, called Display Traits, has been added. It shows how display traits can be used in a ASViewController with a normal ASDisplayNode as its root, as well as in ASViewControllers hosting table nodes and collection nodes. There is also an example of overriding the default display traits of a VC.

Please provide feedback!
This commit is contained in:
rcancro
2016-04-25 16:59:00 -07:00
parent 495f32f0ef
commit 8bb4eba080
37 changed files with 1535 additions and 68 deletions
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7
AsyncDisplayKit/Private/ASEnvironmentInternal.h
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@@ -12,7 +12,8 @@
#pragma once
BOOL ASEnvironmentStatePropagationEnabled();
BOOL ASEnvironmentStateUpwardPropagationEnabled();
BOOL ASEnvironmentStateDownwardPropagationEnabled();
#pragma mark - Set and get extensible values for layout options
@@ -45,10 +46,12 @@ static const struct ASEnvironmentStateExtensions ASEnvironmentDefaultStateExtens
static const struct ASEnvironmentLayoutOptionsState ASEnvironmentDefaultLayoutOptionsState = {};
ASEnvironmentState ASEnvironmentMergeObjectAndState(ASEnvironmentState environmentState, ASEnvironmentLayoutOptionsState state, ASEnvironmentStatePropagation propagation);
static const struct ASEnvironmentHierarchyState ASEnvironmentDefaultHierarchyState = {};
ASEnvironmentState ASEnvironmentMergeObjectAndState(ASEnvironmentState environmentState, ASEnvironmentHierarchyState state, ASEnvironmentStatePropagation propagation);
static const struct ASDisplayTraits ASEnvironmentDefaultDisplayTraits = {};
ASEnvironmentState ASEnvironmentMergeObjectAndState(ASEnvironmentState environmentState, ASDisplayTraits state, ASEnvironmentStatePropagation propagation);
#pragma mark - Propagation