AsyncDisplayKit/AsyncDisplayKit/ASDisplayNodeExtras.mm at master · SummerXZX/AsyncDisplayKit · GitHub

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// ASDisplayNodeExtras.mm

// AsyncDisplayKit

// This source code is licensed under the BSD-style license found in the

// LICENSE file in the root directory of this source tree. An additional grant

// of patent rights can be found in the PATENTS file in the same directory.

#import "ASDisplayNodeExtras.h"

#import "ASDisplayNodeInternal.h"

#import "ASDisplayNode+FrameworkPrivate.h"

#import <queue>

extern ASInterfaceState ASInterfaceStateForDisplayNode(ASDisplayNode *displayNode, UIWindow *window)

{

ASDisplayNodeCAssert(![displayNode isLayerBacked], @"displayNode must not be layer backed as it may have a nil window");

if (displayNode && [displayNode supportsRangeManagedInterfaceState]) {

// Directly clear the visible bit if we are not in a window. This means that the interface state is,

// if not already, about to be set to invisible as it is not possible for an element to be visible

// while outside of a window.

ASInterfaceState interfaceState = displayNode.interfaceState;

return (window == nil ? (interfaceState &= (~ASInterfaceStateVisible)) : interfaceState);

} else {

// For not range managed nodes we might be on our own to try to guess if we're visible.

return (window == nil ? ASInterfaceStateNone : (ASInterfaceStateVisible | ASInterfaceStateDisplay));

}

extern ASDisplayNode *ASLayerToDisplayNode(CALayer *layer)

{

return layer.asyncdisplaykit_node;

}

extern ASDisplayNode *ASViewToDisplayNode(UIView *view)

{

return view.asyncdisplaykit_node;

}

extern void ASDisplayNodePerformBlockOnEveryNode(CALayer *layer, ASDisplayNode *node, void(^block)(ASDisplayNode *node))

{

if (!node) {

ASDisplayNodeCAssertNotNil(layer, @"Cannot recursively perform with nil node and nil layer");

ASDisplayNodeCAssertMainThread();

node = ASLayerToDisplayNode(layer);

}

if (node) {

block(node);

}

if (!layer && [node isNodeLoaded] && ASDisplayNodeThreadIsMain()) {

layer = node.layer;

}

if (layer) {

/// NOTE: The docs say `sublayers` returns a copy, but it does not.

/// See: http://stackoverflow.com/questions/14854480/collection-calayerarray-0x1ed8faa0-was-mutated-while-being-enumerated

for (CALayer *sublayer in [[layer sublayers] copy]) {

ASDisplayNodePerformBlockOnEveryNode(sublayer, nil, block);

}

} else if (node) {

for (ASDisplayNode *subnode in [node subnodes]) {

ASDisplayNodePerformBlockOnEveryNode(nil, subnode, block);

}

extern void ASDisplayNodePerformBlockOnEveryNodeBFS(ASDisplayNode *node, void(^block)(ASDisplayNode *node))

{

// Queue used to keep track of subnodes while traversing this layout in a BFS fashion.

std::queue<ASDisplayNode *> queue;

queue.push(node);

while (!queue.empty()) {

node = queue.front();

queue.pop();

block(node);

// Add all subnodes to process in next step

for (int i = 0; i < node.subnodes.count; i++)

queue.push(node.subnodes[i]);

}

extern void ASDisplayNodePerformBlockOnEverySubnode(ASDisplayNode *node, void(^block)(ASDisplayNode *node))

{

for (ASDisplayNode *subnode in node.subnodes) {

ASDisplayNodePerformBlockOnEveryNode(nil, subnode, block);

}

ASDisplayNode *ASDisplayNodeFindFirstSupernode(ASDisplayNode *node, BOOL (^block)(ASDisplayNode *node))

{

CALayer *layer = node.layer;

while (layer) {

node = ASLayerToDisplayNode(layer);

if (block(node)) {

return node;

}

layer = layer.superlayer;

}

return nil;

}

__kindof ASDisplayNode *ASDisplayNodeFindFirstSupernodeOfClass(ASDisplayNode *start, Class c)

{

return ASDisplayNodeFindFirstSupernode(start, ^(ASDisplayNode *n) {

return [n isKindOfClass:c];

});

}

static void _ASCollectDisplayNodes(NSMutableArray *array, CALayer *layer)

{

ASDisplayNode *node = ASLayerToDisplayNode(layer);

if (nil != node) {

[array addObject:node];

}

for (CALayer *sublayer in layer.sublayers)

_ASCollectDisplayNodes(array, sublayer);

}

extern NSArray<ASDisplayNode *> *ASCollectDisplayNodes(ASDisplayNode *node)

{

NSMutableArray *list = [NSMutableArray array];

for (CALayer *sublayer in node.layer.sublayers) {

_ASCollectDisplayNodes(list, sublayer);

}

return list;

}

#pragma mark - Find all subnodes

static void _ASDisplayNodeFindAllSubnodes(NSMutableArray *array, ASDisplayNode *node, BOOL (^block)(ASDisplayNode *node))

{

if (!node)

return;

for (ASDisplayNode *subnode in node.subnodes) {

if (block(subnode)) {

[array addObject:subnode];

}

_ASDisplayNodeFindAllSubnodes(array, subnode, block);

}

extern NSArray<ASDisplayNode *> *ASDisplayNodeFindAllSubnodes(ASDisplayNode *start, BOOL (^block)(ASDisplayNode *node))

{

NSMutableArray *list = [NSMutableArray array];

_ASDisplayNodeFindAllSubnodes(list, start, block);

return list;

}

extern NSArray<__kindof ASDisplayNode *> *ASDisplayNodeFindAllSubnodesOfClass(ASDisplayNode *start, Class c)

{

return ASDisplayNodeFindAllSubnodes(start, ^(ASDisplayNode *n) {

return [n isKindOfClass:c];

});

}

#pragma mark - Find first subnode

static ASDisplayNode *_ASDisplayNodeFindFirstNode(ASDisplayNode *startNode, BOOL includeStartNode, BOOL (^block)(ASDisplayNode *node))

{

for (ASDisplayNode *subnode in startNode.subnodes) {

ASDisplayNode *foundNode = _ASDisplayNodeFindFirstNode(subnode, YES, block);

if (foundNode) {

return foundNode;

}

if (includeStartNode && block(startNode))

return startNode;

return nil;

}

extern __kindof ASDisplayNode *ASDisplayNodeFindFirstNode(ASDisplayNode *startNode, BOOL (^block)(ASDisplayNode *node))

{

return _ASDisplayNodeFindFirstNode(startNode, YES, block);

}

extern __kindof ASDisplayNode *ASDisplayNodeFindFirstSubnode(ASDisplayNode *startNode, BOOL (^block)(ASDisplayNode *node))

{

return _ASDisplayNodeFindFirstNode(startNode, NO, block);

}

extern __kindof ASDisplayNode *ASDisplayNodeFindFirstSubnodeOfClass(ASDisplayNode *start, Class c)

{

return ASDisplayNodeFindFirstSubnode(start, ^(ASDisplayNode *n) {

return [n isKindOfClass:c];

});

}

static inline BOOL _ASDisplayNodeIsAncestorOfDisplayNode(ASDisplayNode *possibleAncestor, ASDisplayNode *possibleDescendant)

{

ASDisplayNode *supernode = possibleDescendant;

while (supernode) {

if (supernode == possibleAncestor) {

return YES;

}

supernode = supernode.supernode;

}

return NO;

}

extern ASDisplayNode *ASDisplayNodeFindClosestCommonAncestor(ASDisplayNode *node1, ASDisplayNode *node2)

{

ASDisplayNode *possibleAncestor = node1;

while (possibleAncestor) {

if (_ASDisplayNodeIsAncestorOfDisplayNode(possibleAncestor, node2)) {

break;

}

possibleAncestor = possibleAncestor.supernode;

}

ASDisplayNodeCAssertNotNil(possibleAncestor, @"Could not find a common ancestor between node1: %@ and node2: %@", node1, node2);

return possibleAncestor;

}

extern ASDisplayNode *ASDisplayNodeUltimateParentOfNode(ASDisplayNode *node)

{

// node <- supernode on each loop

// previous <- node on each loop where node is not nil

// previous is the final non-nil value of supernode, i.e. the root node

ASDisplayNode *previousNode = node;

while ((node = [node supernode])) {

previousNode = node;

}

return previousNode;

}

#pragma mark - Placeholders

UIColor *ASDisplayNodeDefaultPlaceholderColor()

{

static UIColor *defaultPlaceholderColor;

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

defaultPlaceholderColor = [UIColor colorWithWhite:0.95 alpha:1.0];

});

return defaultPlaceholderColor;

}

UIColor *ASDisplayNodeDefaultTintColor()

{

static UIColor *defaultTintColor;

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

defaultTintColor = [UIColor colorWithRed:0.0 green:0.478 blue:1.0 alpha:1.0];

});

return defaultTintColor;

}

#pragma mark - Hierarchy Notifications

void ASDisplayNodeDisableHierarchyNotifications(ASDisplayNode *node)

{

[node __incrementVisibilityNotificationsDisabled];

}

void ASDisplayNodeEnableHierarchyNotifications(ASDisplayNode *node)

{

[node __decrementVisibilityNotificationsDisabled];

}

AsyncDisplayKit/AsyncDisplayKit/ASDisplayNodeExtras.mm at master · SummerXZX/AsyncDisplayKit · GitHub

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