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96 lines
2.9 KiB
Plaintext
96 lines
2.9 KiB
Plaintext
/* Copyright (c) 2015-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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#import "ASAbstractLayoutController.h"
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#include <vector>
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#import "ASAssert.h"
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@interface ASAbstractLayoutController () {
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std::vector<ASRangeTuningParameters> _tuningParameters;
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}
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@end
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@implementation ASAbstractLayoutController
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- (instancetype)init
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{
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if (!(self = [super init])) {
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return nil;
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}
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_tuningParameters = std::vector<ASRangeTuningParameters>(ASLayoutRangeTypeCount);
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_tuningParameters[ASLayoutRangeTypePreload] = {
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.leadingBufferScreenfuls = 3,
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.trailingBufferScreenfuls = 2
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};
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_tuningParameters[ASLayoutRangeTypeRender] = {
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.leadingBufferScreenfuls = 2,
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.trailingBufferScreenfuls = 1
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};
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return self;
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}
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#pragma mark - Tuning Parameters
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- (ASRangeTuningParameters)tuningParametersForRangeType:(ASLayoutRangeType)rangeType
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{
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ASDisplayNodeAssert(rangeType < _tuningParameters.size(), @"Requesting a range that is OOB for the configured tuning parameters");
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return _tuningParameters[rangeType];
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}
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- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeType:(ASLayoutRangeType)rangeType
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{
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ASDisplayNodeAssert(rangeType < _tuningParameters.size(), @"Requesting a range that is OOB for the configured tuning parameters");
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_tuningParameters[rangeType] = tuningParameters;
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}
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// Support for the deprecated tuningParameters property
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- (ASRangeTuningParameters)tuningParameters
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{
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return [self tuningParametersForRangeType:ASLayoutRangeTypeRender];
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}
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// Support for the deprecated tuningParameters property
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- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters
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{
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[self setTuningParameters:tuningParameters forRangeType:ASLayoutRangeTypeRender];
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}
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#pragma mark - Index Path Range Support
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// Support for deprecated method
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- (BOOL)shouldUpdateForVisibleIndexPath:(NSArray *)indexPaths viewportSize:(CGSize)viewportSize
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{
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return [self shouldUpdateForVisibleIndexPaths:indexPaths viewportSize:viewportSize rangeType:ASLayoutRangeTypeRender];
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}
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// Support for the deprecated method
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- (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection viewportSize:(CGSize)viewportSize
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{
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return [self indexPathsForScrolling:scrollDirection viewportSize:viewportSize rangeType:ASLayoutRangeTypeRender];
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}
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#pragma mark - Abstract
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- (BOOL)shouldUpdateForVisibleIndexPaths:(NSArray *)indexPaths viewportSize:(CGSize)viewportSize rangeType:(ASLayoutRangeType)rangeType
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{
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ASDisplayNodeAssertNotSupported();
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return NO;
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}
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- (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection viewportSize:(CGSize)viewportSize rangeType:(ASLayoutRangeType)rangeType
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{
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ASDisplayNodeAssertNotSupported();
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return nil;
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}
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@end
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