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Shuffle & Cleanup Stuff (#3080)
This commit is contained in:
Adlai Holler
GitHub
317
Source/ASViewController.mm
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317
Source/ASViewController.mm
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//
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// ASViewController.mm
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// AsyncDisplayKit
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//
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// Created by Huy Nguyen on 16/09/15.
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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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 <AsyncDisplayKit/ASViewController.h>
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#import <AsyncDisplayKit/ASAssert.h>
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#import <AsyncDisplayKit/ASAvailability.h>
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#import <AsyncDisplayKit/ASDisplayNode+FrameworkPrivate.h>
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#import <AsyncDisplayKit/ASLayout.h>
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#import <AsyncDisplayKit/ASTraitCollection.h>
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#import <AsyncDisplayKit/ASRangeControllerUpdateRangeProtocol+Beta.h>
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#import <AsyncDisplayKit/ASInternalHelpers.h>
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#define AS_LOG_VISIBILITY_CHANGES 0
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@implementation ASViewController
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{
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BOOL _ensureDisplayed;
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BOOL _automaticallyAdjustRangeModeBasedOnViewEvents;
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BOOL _parentManagesVisibilityDepth;
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NSInteger _visibilityDepth;
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BOOL _selfConformsToRangeModeProtocol;
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BOOL _nodeConformsToRangeModeProtocol;
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}
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- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
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{
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if (!(self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
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return nil;
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}
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[self _initializeInstance];
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return self;
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}
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- (instancetype)initWithCoder:(NSCoder *)aDecoder
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{
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if (!(self = [super initWithCoder:aDecoder])) {
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return nil;
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}
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[self _initializeInstance];
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return self;
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}
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- (instancetype)initWithNode:(ASDisplayNode *)node
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{
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if (!(self = [super initWithNibName:nil bundle:nil])) {
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return nil;
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}
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_node = node;
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[self _initializeInstance];
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return self;
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}
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- (void)_initializeInstance
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{
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if (_node == nil) {
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return;
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}
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_selfConformsToRangeModeProtocol = [self conformsToProtocol:@protocol(ASRangeControllerUpdateRangeProtocol)];
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_nodeConformsToRangeModeProtocol = [_node conformsToProtocol:@protocol(ASRangeControllerUpdateRangeProtocol)];
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_automaticallyAdjustRangeModeBasedOnViewEvents = _selfConformsToRangeModeProtocol || _nodeConformsToRangeModeProtocol;
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// In case the node will get loaded
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if (_node.nodeLoaded) {
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// Node already loaded the view
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[self view];
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} else {
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// If the node didn't load yet add ourselves as on did load observer to load the view in case the node gets loaded
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// before the view controller
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__weak __typeof__(self) weakSelf = self;
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[_node onDidLoad:^(__kindof ASDisplayNode * _Nonnull node) {
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if ([weakSelf isViewLoaded] == NO) {
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[weakSelf view];
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}
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}];
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}
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}
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- (void)dealloc
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{
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ASPerformBackgroundDeallocation(_node);
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}
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- (void)loadView
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{
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// Apple applies a frame and autoresizing masks we need. Allocating a view is not
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// nearly as expensive as adding and removing it from a hierarchy, and fortunately
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// we can avoid that here. Enabling layerBacking on a single node in the hierarchy
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// will have a greater performance benefit than the impact of this transient view.
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[super loadView];
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if (_node == nil) {
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return;
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}
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ASDisplayNodeAssertTrue(!_node.layerBacked);
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UIView *view = self.view;
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CGRect frame = view.frame;
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UIViewAutoresizing autoresizingMask = view.autoresizingMask;
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// We have what we need, so now create and assign the view we actually want.
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view = _node.view;
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_node.frame = frame;
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_node.autoresizingMask = autoresizingMask;
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self.view = view;
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// ensure that self.node has a valid trait collection before a subclass's implementation of viewDidLoad.
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// Any subnodes added in viewDidLoad will then inherit the proper environment.
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ASPrimitiveTraitCollection traitCollection = [self primitiveTraitCollectionForUITraitCollection:self.traitCollection];
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[self propagateNewTraitCollection:traitCollection];
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}
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- (void)viewWillLayoutSubviews
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{
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[super viewWillLayoutSubviews];
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// Before layout, make sure that our trait collection containerSize actually matches the size of our bounds.
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// If not, we need to update the traits and propagate them.
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CGSize boundsSize = self.view.bounds.size;
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if (CGSizeEqualToSize(self.node.primitiveTraitCollection.containerSize, boundsSize) == NO) {
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[UIView performWithoutAnimation:^{
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ASPrimitiveTraitCollection traitCollection = [self primitiveTraitCollectionForUITraitCollection:self.traitCollection];
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traitCollection.containerSize = boundsSize;
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// this method will call measure
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[self propagateNewTraitCollection:traitCollection];
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}];
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} else {
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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// Call layoutThatFits: to let the node prepare for a layout that will happen shortly in the layout pass of the view.
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// If the node's constrained size didn't change between the last layout pass it's a no-op
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[_node layoutThatFits:[self nodeConstrainedSize]];
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#pragma clang diagnostic pop
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}
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}
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- (void)viewDidLayoutSubviews
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{
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if (_ensureDisplayed && self.neverShowPlaceholders) {
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_ensureDisplayed = NO;
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[_node recursivelyEnsureDisplaySynchronously:YES];
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}
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[super viewDidLayoutSubviews];
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}
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ASVisibilityDidMoveToParentViewController;
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- (void)viewWillAppear:(BOOL)animated
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{
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[super viewWillAppear:animated];
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_ensureDisplayed = YES;
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// A layout pass is forced this early to get nodes like ASCollectionNode, ASTableNode etc.
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// into the hierarchy before UIKit applies the scroll view inset adjustments, if automatic subnode management
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// is enabled. Otherwise the insets would not be applied.
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[_node.view layoutIfNeeded];
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if (_parentManagesVisibilityDepth == NO) {
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[self setVisibilityDepth:0];
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}
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}
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ASVisibilitySetVisibilityDepth;
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ASVisibilityViewDidDisappearImplementation;
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ASVisibilityDepthImplementation;
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- (void)visibilityDepthDidChange
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{
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ASLayoutRangeMode rangeMode = ASLayoutRangeModeForVisibilityDepth(self.visibilityDepth);
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#if AS_LOG_VISIBILITY_CHANGES
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NSString *rangeModeString;
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switch (rangeMode) {
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case ASLayoutRangeModeMinimum:
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rangeModeString = @"Minimum";
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break;
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case ASLayoutRangeModeFull:
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rangeModeString = @"Full";
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break;
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case ASLayoutRangeModeVisibleOnly:
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rangeModeString = @"Visible Only";
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break;
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case ASLayoutRangeModeLowMemory:
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rangeModeString = @"Low Memory";
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break;
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default:
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break;
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}
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NSLog(@"Updating visibility of:%@ to: %@ (visibility depth: %d)", self, rangeModeString, self.visibilityDepth);
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#endif
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[self updateCurrentRangeModeWithModeIfPossible:rangeMode];
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}
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#pragma mark - Automatic range mode
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- (BOOL)automaticallyAdjustRangeModeBasedOnViewEvents
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{
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return _automaticallyAdjustRangeModeBasedOnViewEvents;
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}
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- (void)setAutomaticallyAdjustRangeModeBasedOnViewEvents:(BOOL)automaticallyAdjustRangeModeBasedOnViewEvents
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{
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if (automaticallyAdjustRangeModeBasedOnViewEvents != _automaticallyAdjustRangeModeBasedOnViewEvents) {
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if (automaticallyAdjustRangeModeBasedOnViewEvents && _selfConformsToRangeModeProtocol == NO && _nodeConformsToRangeModeProtocol == NO) {
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NSLog(@"Warning: automaticallyAdjustRangeModeBasedOnViewEvents set to YES in %@, but range mode updating is not possible because neither view controller nor node %@ conform to ASRangeControllerUpdateRangeProtocol.", self, _node);
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}
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_automaticallyAdjustRangeModeBasedOnViewEvents = automaticallyAdjustRangeModeBasedOnViewEvents;
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}
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}
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- (void)updateCurrentRangeModeWithModeIfPossible:(ASLayoutRangeMode)rangeMode
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{
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if (!_automaticallyAdjustRangeModeBasedOnViewEvents) {
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return;
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}
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if (_selfConformsToRangeModeProtocol) {
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id<ASRangeControllerUpdateRangeProtocol> rangeUpdater = (id<ASRangeControllerUpdateRangeProtocol>)self;
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[rangeUpdater updateCurrentRangeWithMode:rangeMode];
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}
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if (_nodeConformsToRangeModeProtocol) {
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id<ASRangeControllerUpdateRangeProtocol> rangeUpdater = (id<ASRangeControllerUpdateRangeProtocol>)_node;
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[rangeUpdater updateCurrentRangeWithMode:rangeMode];
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}
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}
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#pragma mark - Layout Helpers
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- (ASSizeRange)nodeConstrainedSize
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{
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return ASSizeRangeMake(self.view.bounds.size);
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}
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- (ASInterfaceState)interfaceState
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{
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return _node.interfaceState;
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}
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#pragma mark - ASTraitEnvironment
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- (ASPrimitiveTraitCollection)primitiveTraitCollectionForUITraitCollection:(UITraitCollection *)traitCollection
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{
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if (self.overrideDisplayTraitsWithTraitCollection) {
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ASTraitCollection *asyncTraitCollection = self.overrideDisplayTraitsWithTraitCollection(traitCollection);
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return [asyncTraitCollection primitiveTraitCollection];
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}
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ASDisplayNodeAssertMainThread();
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ASPrimitiveTraitCollection asyncTraitCollection = ASPrimitiveTraitCollectionFromUITraitCollection(traitCollection);
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asyncTraitCollection.containerSize = self.view.frame.size;
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return asyncTraitCollection;
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}
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- (void)propagateNewTraitCollection:(ASPrimitiveTraitCollection)traitCollection
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{
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ASPrimitiveTraitCollection oldTraitCollection = self.node.primitiveTraitCollection;
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if (ASPrimitiveTraitCollectionIsEqualToASPrimitiveTraitCollection(traitCollection, oldTraitCollection) == NO) {
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self.node.primitiveTraitCollection = traitCollection;
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NSArray<id<ASLayoutElement>> *children = [self.node sublayoutElements];
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for (id<ASLayoutElement> child in children) {
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ASTraitCollectionPropagateDown(child, traitCollection);
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}
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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// Once we've propagated all the traits, layout this node.
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// Remeasure the node with the latest constrained size – old constrained size may be incorrect.
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[_node layoutThatFits:[self nodeConstrainedSize]];
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#pragma clang diagnostic pop
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}
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}
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- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
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{
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[super traitCollectionDidChange:previousTraitCollection];
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ASPrimitiveTraitCollection traitCollection = [self primitiveTraitCollectionForUITraitCollection:self.traitCollection];
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traitCollection.containerSize = self.view.bounds.size;
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[self propagateNewTraitCollection:traitCollection];
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}
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- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
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{
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[super didRotateFromInterfaceOrientation:fromInterfaceOrientation];
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ASPrimitiveTraitCollection traitCollection = _node.primitiveTraitCollection;
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traitCollection.containerSize = self.view.bounds.size;
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[self propagateNewTraitCollection:traitCollection];
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}
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@end
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