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50 lines
1.8 KiB
Objective-C
50 lines
1.8 KiB
Objective-C
/* Copyright (c) 2014-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 <Foundation/Foundation.h>
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/**
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* Each mode has a complete set of tuning parameters for range types.
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* Depending on some conditions (including interface state and direction of the scroll view, state of rendering engine, etc),
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* a range controller can choose which mode it should use at a given time.
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*/
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typedef NS_ENUM(NSUInteger, ASLayoutRangeMode) {
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/**
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* Minimum mode is used when a range controller should limit the amount of work it performs.
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* Thus, fewer views/layers are created and less data is fetched, saving system resources.
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* Range controller can automatically switch to full mode when conditions change.
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*/
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ASLayoutRangeModeMinimum = 0,
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/**
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* Normal/Full mode that a range controller uses to provide the best experience for end users.
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* This mode is usually used for an active scroll view.
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* A range controller under this requires more resources compare to minimum mode.
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*/
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ASLayoutRangeModeFull,
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/**
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* Low Memory mode is used when a range controller should limit the amount of work it performs to 0.
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* Thus, it discards most of the views/layers that are created and it is trying to save as much system
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* resources as possible.
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*/
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ASLayoutRangeModeLowMemory,
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ASLayoutRangeModeCount
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};
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#define ASLayoutRangeModeInvalid ASLayoutRangeModeCount
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typedef NS_ENUM(NSInteger, ASLayoutRangeType) {
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ASLayoutRangeTypeDisplay,
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ASLayoutRangeTypeFetchData,
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ASLayoutRangeTypeCount
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};
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#define ASLayoutRangeTypeRender ASLayoutRangeTypeDisplay
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#define ASLayoutRangeTypePreload ASLayoutRangeTypeFetchData
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