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8bb4eba080
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!
80 lines
3.5 KiB
Objective-C
80 lines
3.5 KiB
Objective-C
/*
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* 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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*/
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#import "ASEnvironment.h"
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#pragma once
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BOOL ASEnvironmentStateUpwardPropagationEnabled();
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BOOL ASEnvironmentStateDownwardPropagationEnabled();
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#pragma mark - Set and get extensible values for layout options
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void _ASEnvironmentLayoutOptionsExtensionSetBoolAtIndex(id<ASEnvironment> object, int idx, BOOL value);
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BOOL _ASEnvironmentLayoutOptionsExtensionGetBoolAtIndex(id<ASEnvironment> object, int idx);
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void _ASEnvironmentLayoutOptionsExtensionSetIntegerAtIndex(id<ASEnvironment> object, int idx, NSInteger value);
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NSInteger _ASEnvironmentLayoutOptionsExtensionGetIntegerAtIndex(id<ASEnvironment> object, int idx);
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void _ASEnvironmentLayoutOptionsExtensionSetEdgeInsetsAtIndex(id<ASEnvironment> object, int idx, UIEdgeInsets value);
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UIEdgeInsets _ASEnvironmentLayoutOptionsExtensionGetEdgeInsetsAtIndex(id<ASEnvironment> object, int idx);
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#pragma mark - Traversing an ASEnvironment Tree
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void ASEnvironmentPerformBlockOnObjectAndChildren(id<ASEnvironment> object, void(^block)(id<ASEnvironment> object));
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void ASEnvironmentPerformBlockOnObjectAndParents(id<ASEnvironment> object, void(^block)(id<ASEnvironment> object));
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#pragma mark -
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enum class ASEnvironmentStatePropagation { DOWN, UP };
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#pragma mark - Merging
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static const struct ASEnvironmentStateExtensions ASEnvironmentDefaultStateExtensions = {};
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static const struct ASEnvironmentLayoutOptionsState ASEnvironmentDefaultLayoutOptionsState = {};
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ASEnvironmentState ASEnvironmentMergeObjectAndState(ASEnvironmentState environmentState, ASEnvironmentLayoutOptionsState state, ASEnvironmentStatePropagation propagation);
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static const struct ASEnvironmentHierarchyState ASEnvironmentDefaultHierarchyState = {};
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ASEnvironmentState ASEnvironmentMergeObjectAndState(ASEnvironmentState environmentState, ASEnvironmentHierarchyState state, ASEnvironmentStatePropagation propagation);
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static const struct ASDisplayTraits ASEnvironmentDefaultDisplayTraits = {};
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ASEnvironmentState ASEnvironmentMergeObjectAndState(ASEnvironmentState environmentState, ASDisplayTraits state, ASEnvironmentStatePropagation propagation);
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#pragma mark - Propagation
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template <typename ASEnvironmentStateType>
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void ASEnvironmentStatePropagateDown(id<ASEnvironment> object, ASEnvironmentStateType state) {
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ASEnvironmentPerformBlockOnObjectAndChildren(object, ^(id<ASEnvironment> node) {
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object.environmentState = ASEnvironmentMergeObjectAndState(object.environmentState, state, ASEnvironmentStatePropagation::DOWN);
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});
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}
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template <typename ASEnvironmentStateType>
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void ASEnvironmentStatePropagateUp(id<ASEnvironment> object, ASEnvironmentStateType state) {
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ASEnvironmentPerformBlockOnObjectAndParents(object, ^(id<ASEnvironment> node) {
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object.environmentState = ASEnvironmentMergeObjectAndState(object.environmentState, state, ASEnvironmentStatePropagation::UP);
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});
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}
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template <typename ASEnvironmentStateType>
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void ASEnvironmentStateApply(id<ASEnvironment> object, ASEnvironmentStateType& state, ASEnvironmentStatePropagation propagate) {
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if (propagate == ASEnvironmentStatePropagation::DOWN) {
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ASEnvironmentStatePropagateUp(object, state);
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} else if (propagate == ASEnvironmentStatePropagation::UP) {
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ASEnvironmentStatePropagateDown(object, state);
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}
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}
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