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/* Copyright (c) 2014-present, Facebook, Inc.
* All rights reserved.
*
* 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"
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]) {
layer = node.layer;
}
if (layer) {
for (CALayer *sublayer in [layer sublayers]) {
ASDisplayNodePerformBlockOnEveryNode(sublayer, nil, block);
}
} else if (node) {
for (ASDisplayNode *subnode in [node subnodes]) {
ASDisplayNodePerformBlockOnEveryNode(nil, subnode, block);
}
}
}
extern void ASDisplayNodePerformBlockOnEverySubnode(ASDisplayNode *node, void(^block)(ASDisplayNode *node))
{
for (ASDisplayNode *subnode in node.subnodes) {
ASDisplayNodePerformBlockOnEveryNode(nil, subnode, block);
}
}
id ASDisplayNodeFind(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;
}
id ASDisplayNodeFindClass(ASDisplayNode *start, Class c)
{
return ASDisplayNodeFind(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 *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:node];
}
_ASDisplayNodeFindAllSubnodes(array, subnode, block);
}
}
extern NSArray *ASDisplayNodeFindAllSubnodes(ASDisplayNode *start, BOOL (^block)(ASDisplayNode *node))
{
NSMutableArray *list = [NSMutableArray array];
_ASDisplayNodeFindAllSubnodes(list, start, block);
return list;
}
extern NSArray *ASDisplayNodeFindAllSubnodesOfClass(ASDisplayNode *start, Class c)
{
return ASDisplayNodeFindAllSubnodes(start, ^(ASDisplayNode *n) {
return [n isKindOfClass:c];
});
}
#pragma mark - Find first subnode
static ASDisplayNode *_ASDisplayNodeFindFirstSubnode(ASDisplayNode *startNode, BOOL includeStartNode, BOOL (^block)(ASDisplayNode *node))
{
for (ASDisplayNode *subnode in startNode.subnodes) {
ASDisplayNode *foundNode = _ASDisplayNodeFindFirstSubnode(subnode, YES, block);
if (foundNode) {
return foundNode;
}
}
if (includeStartNode && block(startNode))
return startNode;
return nil;
}
extern id ASDisplayNodeFindFirstSubnode(ASDisplayNode *startNode, BOOL (^block)(ASDisplayNode *node))
{
return _ASDisplayNodeFindFirstSubnode(startNode, NO, block);
}
extern id ASDisplayNodeFindFirstSubnodeOfClass(ASDisplayNode *start, Class c)
{
return ASDisplayNodeFindFirstSubnode(start, ^(ASDisplayNode *n) {
return [n isKindOfClass:c];
});
}
static inline BOOL _ASDisplayNodeIsAncestorOfDisplayNode(ASDisplayNode *possibleAncestor, ASDisplayNode *possibleDescendent)
{
ASDisplayNode *supernode = possibleDescendent;
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];
}