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7dd94a6102
Introduce `ASTableView`, a UITableView subclass that uses `ASCellNode` instead of UITableViewCell. Add working range support via `ASRangeController`, which observes the visible range, maintains a working range, and handles most ASDK machinery. ASRangeController is loosely-enough coupled that it should be easily adapted to UICollectionView if that's desired in the future. Notable considerations in the ASRangeController architecture: * There's no sense rewriting UITableView -- the real win comes from using nodes instead of UITableViewCells (easily parallelisable computation, large number of cells vs. few table views, etc.). So, use a UITableView with empty cells, using UITableViewCell's contentView as a host for arbitrary node hierarchies. * Instead of lazy-loading cells the instant they're needed by UITableView, load them in advance. Preload a substantial number of nodes in the direction of scroll, as well as a small buffer in the other direction. * Maintain compatibility with UITableView's API, with one primary change -- consumer code yields configured ASCellNodes, not UITableViewCells. * Don't use -tableView:heightForRowAtIndexPath:. Nodes already compute their preferred sizes and cache results for use at layout-time, so ASTableView uses their calculatedSizes directly. * Corollary: ASTableView is only aware of nodes that have been sized. This means that, if a cell appears onscreen, it has layout data and can display a "realistic placeholder", e.g. by making its subnodes' background colour grey. Other improvements: * Remove dead references and update headers (fixes #7, #20). * Rename `-[ASDisplayNode sizeToFit:]` to `-measure:` and fix `constrainedSizeForCalulatedSize` typo (fixes #15). * Rename `-willAppear` and `-didDisappear` to `-willEnterHierarchy` and `-didExitHierarchy`. Remove `-willDisappear` -- it was redundant, and there was no counterpart `-didAppear`. * Rename `viewLoaded` to `nodeLoaded`.
110 lines
4.0 KiB
Objective-C
110 lines
4.0 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 <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASRangeController.h>
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#import <AsyncDisplayKit/ASTableViewProtocols.h>
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@class ASCellNode;
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@protocol ASTableViewDataSource;
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@protocol ASTableViewDelegate;
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/**
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* Node-based table view.
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*
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* ASTableView is a version of UITableView that uses nodes -- specifically, ASCellNode subclasses -- with asynchronous
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* pre-rendering instead of synchronously loading UITableViewCells.
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*/
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@interface ASTableView : UITableView
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@property (nonatomic, weak) id<ASTableViewDataSource> asyncDataSource;
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@property (nonatomic, weak) id<ASTableViewDelegate> asyncDelegate;
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/**
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* Tuning parameters for the working range.
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*
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* Defaults to a trailing buffer of one screenful and a leading buffer of two screenfuls.
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*/
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@property (nonatomic, assign) ASRangeTuningParameters rangeTuningParameters;
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/**
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* Reload everything from scratch, destroying the working range and all cached nodes.
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*
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* @warning This method is substantially more expensive than UITableView's version.
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*/
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- (void)reloadData;
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/**
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* WARNING: ASTableView's update/editing support is not yet implemented. Use of these methods will fire an assertion.
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*
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* This initial version of ASTableView only supports appending nodes (see below). If you'd like to see full-fledged
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* support for data source updates and interactive editing, please file a GitHub issue -- AsyncDisplayKit can do it,
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* we just haven't built it out yet. :]
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*/
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//- (void)beginUpdates;
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//- (void)endUpdates;
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//
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//- (void)insertSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
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//- (void)deleteSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
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//- (void)reloadSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation;
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//- (void)moveSection:(NSInteger)section toSection:(NSInteger)newSection;
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//
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//- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
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//- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
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//- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
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//- (void)moveRowAtIndexPath:(NSIndexPath *)indexPath toIndexPath:(NSIndexPath *)newIndexPath;
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//
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//- (void)setEditing:(BOOL)editing;
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//- (void)setEditing:(BOOL)editing animated:(BOOL)animated;
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/**
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* Append nodes.
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*
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* As with UITableView, the asyncDataSource must be updated to reflect the new nodes before this method is called.
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*
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* @param indexPaths Ordered array of index paths corresponding to the nodes to be added.
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*/
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- (void)appendNodesWithIndexPaths:(NSArray *)indexPaths;
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@end
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/**
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* This is a node-based UITableViewDataSource.
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*/
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@protocol ASTableViewDataSource <ASCommonTableViewDataSource, NSObject>
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/**
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* Similar to -tableView:cellForRowAtIndexPath:.
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*
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* Return a node for display at this indexpath. Must be thread-safe (can be called on the main thread or a background
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* queue) and should not implement reuse (it will be called once per row). Unlike UITableView's version, this method
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* is not called when the row is about to display.
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*/
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- (ASCellNode *)tableView:(ASTableView *)tableView nodeForRowAtIndexPath:(NSIndexPath *)indexPath;
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@end
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/**
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* This is a node-based UITableViewDelegate.
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*
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* Note that -tableView:heightForRowAtIndexPath: has been removed; instead, your custom ASCellNode subclasses are
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* responsible for deciding their preferred onscreen height in -calculateSizeThatFits:.
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*/
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@protocol ASTableViewDelegate <ASCommonTableViewDelegate, NSObject>
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@optional
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- (void)tableView:(UITableView *)tableView willDisplayNodeForRowAtIndexPath:(NSIndexPath *)indexPath;
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- (void)tableView:(UITableView *)tableView didEndDisplayingNodeForRowAtIndexPath:(NSIndexPath*)indexPath;
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@end
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