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Add ASLayoutRangeModeLowMemory

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This commit is contained in:
Michael Schneider
2016-03-09 14:40:40 -08:00
parent de4e4db671
commit bf822dee37
6 changed files with 93 additions and 14 deletions
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83
AsyncDisplayKit/Details/ASRangeController.mm
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@@ -9,6 +9,7 @@
#import "ASRangeController.h"
#import "ASAssert.h"
#import "ASWeakSet.h"
#import "ASDisplayNodeExtras.h"
#import "ASDisplayNodeInternal.h"
#import "ASMultiDimensionalArrayUtils.h"
@@ -32,6 +33,29 @@
@implementation ASRangeController
#pragma mark - NSObject
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
[self registerLowMemoryNotification];
});
}
#pragma mark - Class
+ (ASWeakSet *)rangeControllers
{
static ASWeakSet<ASRangeController *> *rangeController;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
rangeController = [[ASWeakSet alloc] init];
});
return rangeController;
}
#pragma mark - Lifecycle
- (instancetype)init
{
if (!(self = [super init])) {
@@ -42,6 +66,8 @@
_currentRangeMode = ASLayoutRangeModeInvalid;
_didUpdateCurrentRange = NO;
[[self.class rangeControllers] addObject:self];
return self;
}
@@ -52,6 +78,33 @@
}
}
#pragma mark - Low Memory Handling
+ (void)registerLowMemoryNotification
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(lowMemoryWarning) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
}
+ (void)lowMemoryWarning
{
#if ASRangeControllerAutomaticLowMemoryHandling
ASWeakSet *rangeControllers = [self rangeControllers];
for (ASRangeController *rangeController in rangeControllers) {
if (rangeController.dataSource == nil) {
continue;
}
ASInterfaceState interfaceState = [rangeController.dataSource interfaceStateForRangeController:rangeController];
if (ASInterfaceStateIncludesDisplay(interfaceState)) {
continue;
}
[rangeController updateCurrentRangeWithMode:ASLayoutRangeModeLowMemory];
}
#endif
}
#pragma mark - Core visible node range managment API
+ (ASLayoutRangeMode)rangeModeForInterfaceState:(ASInterfaceState)interfaceState
@@ -158,7 +211,9 @@
ASRangeTuningParameters parametersDisplay = [_layoutController tuningParametersForRangeMode:rangeMode
rangeType:ASLayoutRangeTypeDisplay];
if (ASRangeTuningParametersEqualToRangeTuningParameters(parametersDisplay, ASRangeTuningParametersZero)) {
if (rangeMode == ASLayoutRangeModeLowMemory) {
displayIndexPaths = [NSSet set];
} else if (ASRangeTuningParametersEqualToRangeTuningParameters(parametersDisplay, ASRangeTuningParametersZero)) {
displayIndexPaths = visibleIndexPaths;
} else if (ASRangeTuningParametersEqualToRangeTuningParameters(parametersDisplay, parametersFetchData)) {
displayIndexPaths = fetchDataIndexPaths;
@@ -193,8 +248,8 @@
// This can be done once there is an API to observe to (or be notified upon) interface state changes or pipeline enterings
[self registerForNotificationsForInterfaceStateIfNeeded:selfInterfaceState];
#if RangeControllerLoggingEnabled
NSMutableArray<NSIndexPath *> *modifiedIndexPaths = (RangeControllerLoggingEnabled ? [NSMutableArray array] : nil);
#if ASRangeControllerLoggingEnabled
NSMutableArray<NSIndexPath *> *modifiedIndexPaths = (ASRangeControllerLoggingEnabled ? [NSMutableArray array] : nil);
#endif
for (NSIndexPath *indexPath in allIndexPaths) {
@@ -216,14 +271,20 @@
// If selfInterfaceState isn't visible, then visibleIndexPaths represents what /will/ be immediately visible at the
// instant we come onscreen. So, fetch data and display all of those things, but don't waste resources preloading yet.
// We handle this as a separate case to minimize set operations for offscreen preloading, including containsObject:.
// Set Layout, Fetch Data, Display. DO NOT set Visible: even though these elements are in the visible range / "viewport",
// our overall container object is itself not visible yet. The moment it becomes visible, we will run the condition above.
if ([allCurrentIndexPaths containsObject:indexPath]) {
// We might be looking at an indexPath that was previously in-range, but now we need to clear it.
// In that case we'll just set it back to MeasureLayout. Only set Display | FetchData if in allCurrentIndexPaths.
interfaceState |= ASInterfaceStateDisplay;
// DO NOT set Visible: even though these elements are in the visible range / "viewport",
// our overall container object is itself not visible yet. The moment it becomes visible, we will run the condition above
// Set Layout, Fetch Data
interfaceState |= ASInterfaceStateFetchData;
if (rangeMode != ASLayoutRangeModeLowMemory) {
// Add Display.
// We might be looking at an indexPath that was previously in-range, but now we need to clear it.
// In that case we'll just set it back to MeasureLayout. Only set Display | FetchData if in allCurrentIndexPaths.
interfaceState |= ASInterfaceStateDisplay;
}
}
}
@@ -245,7 +306,7 @@
ASDisplayNodeAssert(node.hierarchyState & ASHierarchyStateRangeManaged, @"All nodes reaching this point should be range-managed, or interfaceState may be incorrectly reset.");
// Skip the many method calls of the recursive operation if the top level cell node already has the right interfaceState.
if (node.interfaceState != interfaceState) {
#if RangeControllerLoggingEnabled
#if ASRangeControllerLoggingEnabled
[modifiedIndexPaths addObject:indexPath];
#endif
[node recursivelySetInterfaceState:interfaceState];
@@ -261,7 +322,7 @@
_rangeIsValid = YES;
_queuedRangeUpdate = NO;
#if RangeControllerLoggingEnabled
#if ASRangeControllerLoggingEnabled
NSSet *visibleNodePathsSet = [NSSet setWithArray:visibleNodePaths];
BOOL setsAreEqual = [visibleIndexPaths isEqualToSet:visibleNodePathsSet];
NSLog(@"visible sets are equal: %d", setsAreEqual);