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102 lines
3.3 KiB
Plaintext
102 lines
3.3 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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#import "ASAssert.h"
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#include <vector>
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extern ASRangeTuningParameters const ASRangeTuningParametersZero = {};
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extern BOOL ASRangeTuningParametersEqualToRangeTuningParameters(ASRangeTuningParameters lhs, ASRangeTuningParameters rhs)
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{
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return lhs.leadingBufferScreenfuls == rhs.leadingBufferScreenfuls && lhs.trailingBufferScreenfuls == rhs.trailingBufferScreenfuls;
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}
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@interface ASAbstractLayoutController () {
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std::vector<std::vector<ASRangeTuningParameters>> _tuningParameters;
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CGSize _viewportSize;
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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<std::vector<ASRangeTuningParameters>> (ASLayoutRangeModeCount, std::vector<ASRangeTuningParameters> (ASLayoutRangeTypeCount));
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_tuningParameters[ASLayoutRangeModeMinimum][ASLayoutRangeTypeDisplay] = {
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.leadingBufferScreenfuls = 0.25,
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.trailingBufferScreenfuls = 0.25
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};
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_tuningParameters[ASLayoutRangeModeMinimum][ASLayoutRangeTypeFetchData] = {
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.leadingBufferScreenfuls = 1,
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.trailingBufferScreenfuls = 1
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};
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_tuningParameters[ASLayoutRangeModeFull][ASLayoutRangeTypeDisplay] = {
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.leadingBufferScreenfuls = 1.5,
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.trailingBufferScreenfuls = 0.75
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};
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_tuningParameters[ASLayoutRangeModeFull][ASLayoutRangeTypeFetchData] = {
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.leadingBufferScreenfuls = 3,
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.trailingBufferScreenfuls = 2
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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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return [self tuningParametersForRangeMode:ASLayoutRangeModeFull rangeType:rangeType];
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}
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- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeType:(ASLayoutRangeType)rangeType
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{
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return [self setTuningParameters:tuningParameters forRangeMode:ASLayoutRangeModeFull rangeType:rangeType];
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}
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- (ASRangeTuningParameters)tuningParametersForRangeMode:(ASLayoutRangeMode)rangeMode rangeType:(ASLayoutRangeType)rangeType
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{
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ASDisplayNodeAssert(rangeMode < _tuningParameters.size() && rangeType < _tuningParameters[rangeMode].size(),
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@"Requesting a range that is OOB for the configured tuning parameters");
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return _tuningParameters[rangeMode][rangeType];
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}
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- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeMode:(ASLayoutRangeMode)rangeMode rangeType:(ASLayoutRangeType)rangeType
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{
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ASDisplayNodeAssert(rangeMode < _tuningParameters.size() && rangeType < _tuningParameters[rangeMode].size(),
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@"Setting a range that is OOB for the configured tuning parameters");
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_tuningParameters[rangeMode][rangeType] = tuningParameters;
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}
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#pragma mark - Abstract Index Path Range Support
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- (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection rangeMode:(ASLayoutRangeMode)rangeMode 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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- (void)setViewportSize:(CGSize)viewportSize
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{
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_viewportSize = viewportSize;
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}
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- (CGSize)viewportSize
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{
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return _viewportSize;
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}
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@end
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