45 lines
1.3 KiB
Objective-C
45 lines
1.3 KiB
Objective-C
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import <UIKit/UIKit.h>
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@class IGListAdapter;
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@class IGListSectionController;
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NS_ASSUME_NONNULL_BEGIN
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/**
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Implement this protocol to receive working range events for a list.
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The working range is a range *near* the viewport in which you can begin preparing content for display. For example,
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you could begin decoding images, or warming text caches.
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*/
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NS_SWIFT_NAME(ListWorkingRangeDelegate)
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@protocol IGListWorkingRangeDelegate <NSObject>
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/**
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Notifies the delegate that an section controller will enter the working range.
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@param listAdapter The adapter controlling the list.
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@param sectionController The section controller entering the range.
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*/
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- (void)listAdapter:(IGListAdapter *)listAdapter sectionControllerWillEnterWorkingRange:(IGListSectionController *)sectionController;
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/**
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Notifies the delegate that an section controller exited the working range.
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@param listAdapter The adapter controlling the list.
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@param sectionController The section controller that exited the range.
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*/
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- (void)listAdapter:(IGListAdapter *)listAdapter sectionControllerDidExitWorkingRange:(IGListSectionController *)sectionController;
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@end
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NS_ASSUME_NONNULL_END
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