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35 lines
1.5 KiB
Objective-C
35 lines
1.5 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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/// Each mode has a complete set of tuning parameters for range types.
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/// Depends 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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typedef NS_ENUM(NSUInteger, ASLayoutRangeMode) {
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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, less views/layers are created and less data is fetched.
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/// Range controller can automatically switch to full mode when conditions changed.
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ASLayoutRangeModeMinimum = 0,
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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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ASLayoutRangeModeFull,
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ASLayoutRangeModeCount
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};
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typedef NS_ENUM(NSInteger, ASLayoutRangeType) {
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ASLayoutRangeTypeVisible = 0,
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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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