394 lines
14 KiB
Objective-C
394 lines
14 KiB
Objective-C
/*
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* Copyright [2019] [Doric.Pub]
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//
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// Created by pengfei.zhou on 2019/11/28.
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//
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#import "DoricFlowLayoutNode.h"
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#import "DoricFlowLayoutItemNode.h"
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#import "DoricExtensions.h"
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#import <JavaScriptCore/JavaScriptCore.h>
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@protocol DoricFlowLayoutDelegate
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- (CGFloat)doricFlowLayoutItemHeightAtIndexPath:(NSIndexPath *)indexPath;
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- (CGFloat)doricFlowLayoutItemWidthAtIndexPath:(NSIndexPath *)indexPath;
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- (CGFloat)doricFlowLayoutColumnSpace;
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- (CGFloat)doricFlowLayoutRowSpace;
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- (NSInteger)doricFlowLayoutColumnCount;
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@end
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@interface DoricFlowLayout : UICollectionViewLayout
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@property(nonatomic, readonly) NSInteger columnCount;
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@property(nonatomic, readonly) CGFloat columnSpace;
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@property(nonatomic, readonly) CGFloat rowSpace;
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@property(nonatomic, strong) NSMutableDictionary <NSNumber *, NSNumber *> *columnHeightInfo;
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@property(nonatomic, weak) id <DoricFlowLayoutDelegate> delegate;
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@end
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@implementation DoricFlowLayout
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- (instancetype)init {
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if (self = [super init]) {
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_columnHeightInfo = [NSMutableDictionary new];
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}
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return self;
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}
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- (NSInteger)columnCount {
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return self.delegate.doricFlowLayoutColumnCount ?: 2;
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}
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- (CGFloat)columnSpace {
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return self.delegate.doricFlowLayoutColumnSpace ?: 0;
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}
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- (CGFloat)rowSpace {
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return self.delegate.doricFlowLayoutRowSpace ?: 0;
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}
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- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds {
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return YES;
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}
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- (void)prepareLayout {
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[super prepareLayout];
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for (int i = 0; i < self.columnCount; i++) {
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self.columnHeightInfo[@(i)] = @(0);
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}
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}
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- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect {
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for (int i = 0; i < self.columnCount; i++) {
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self.columnHeightInfo[@(i)] = @(0);
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}
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NSMutableArray *array = [NSMutableArray array];
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NSInteger count = [self.collectionView numberOfItemsInSection:0];
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for (int i = 0; i < count; i++) {
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UICollectionViewLayoutAttributes *attrs = [self layoutAttributesForItemAtIndexPath:[NSIndexPath indexPathForItem:i inSection:0]];
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[array addObject:attrs];
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}
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return array;
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}
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- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath {
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NSNumber *minYOfColumn = @(0);
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for (NSNumber *key in self.columnHeightInfo.allKeys) {
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if ([self.columnHeightInfo[key] floatValue] < [self.columnHeightInfo[minYOfColumn] floatValue]) {
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minYOfColumn = key;
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}
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}
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CGFloat width = [self.delegate doricFlowLayoutItemWidthAtIndexPath:indexPath];
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CGFloat height = [self.delegate doricFlowLayoutItemHeightAtIndexPath:indexPath];
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CGFloat x = (width + self.columnSpace) * [minYOfColumn integerValue];
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CGFloat y = [self.columnHeightInfo[minYOfColumn] floatValue];
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if (y > 0) {
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y += self.rowSpace;
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}
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if (width == self.collectionView.width) {
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CGFloat maxY = 0;
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for (NSNumber *column in self.columnHeightInfo.allValues) {
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maxY = MAX(maxY, [column floatValue]);
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}
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y = maxY + self.rowSpace;
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} else {
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self.columnHeightInfo[minYOfColumn] = @(y + height);
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}
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UICollectionViewLayoutAttributes *attrs = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];
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attrs.frame = CGRectMake(x, y, width, height);
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return attrs;
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}
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- (CGSize)collectionViewContentSize {
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CGFloat width = self.collectionView.width;
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CGFloat height = 0;
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for (NSNumber *column in self.columnHeightInfo.allValues) {
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height = MAX(height, [column floatValue]);
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}
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return CGSizeMake(width, height);
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}
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@end
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@interface DoricFlowLayoutViewCell : UICollectionViewCell
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@property(nonatomic, strong) DoricFlowLayoutItemNode *viewNode;
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@end
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@implementation DoricFlowLayoutViewCell
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@end
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@interface DoricFlowLayoutView : UICollectionView
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@end
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@implementation DoricFlowLayoutView
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- (CGSize)sizeThatFits:(CGSize)size {
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if (self.subviews.count > 0) {
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CGFloat width = size.width;
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CGFloat height = size.height;
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for (UIView *child in self.subviews) {
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CGSize childSize = [child measureSize:size];
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width = MAX(childSize.width, width);
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height = MAX(childSize.height, height);
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}
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return CGSizeMake(width, height);
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}
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return size;
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}
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- (void)layoutSelf:(CGSize)targetSize {
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[super layoutSelf:targetSize];
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[self reloadData];
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}
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@end
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@interface DoricFlowLayoutNode () <UICollectionViewDataSource, UICollectionViewDelegate, DoricFlowLayoutDelegate>
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@property(nonatomic, strong) NSMutableDictionary <NSNumber *, NSString *> *itemViewIds;
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@property(nonatomic, strong) NSMutableDictionary <NSNumber *, NSValue *> *itemSizeInfo;
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@property(nonatomic, assign) NSUInteger itemCount;
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@property(nonatomic, assign) NSUInteger batchCount;
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@property(nonatomic, assign) NSUInteger columnCount;
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@property(nonatomic, assign) CGFloat columnSpace;
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@property(nonatomic, assign) CGFloat rowSpace;
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@property(nonatomic, copy) NSString *renderItemFuncId;
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@property(nonatomic, copy) NSString *onLoadMoreFuncId;
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@property(nonatomic, copy) NSString *loadMoreViewId;
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@property(nonatomic, assign) BOOL loadMore;
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@property(nonatomic, strong) NSMutableSet <DoricDidScrollBlock> *didScrollBlocks;
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@end
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@implementation DoricFlowLayoutNode
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- (instancetype)initWithContext:(DoricContext *)doricContext {
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if (self = [super initWithContext:doricContext]) {
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_itemViewIds = [NSMutableDictionary new];
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_itemSizeInfo = [NSMutableDictionary new];
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_batchCount = 15;
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_columnCount = 2;
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}
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return self;
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}
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- (UICollectionView *)build {
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DoricFlowLayout *flowLayout = [[DoricFlowLayout alloc] init];
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flowLayout.delegate = self;
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return [[[DoricFlowLayoutView alloc] initWithFrame:CGRectZero
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collectionViewLayout:flowLayout]
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also:^(UICollectionView *it) {
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it.backgroundColor = [UIColor whiteColor];
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it.pagingEnabled = YES;
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it.delegate = self;
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it.dataSource = self;
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[it registerClass:[DoricFlowLayoutViewCell class] forCellWithReuseIdentifier:@"doricCell"];
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[it registerClass:[DoricFlowLayoutViewCell class] forCellWithReuseIdentifier:@"doricLoadMoreCell"];
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}];
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}
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- (void)blendView:(UICollectionView *)view forPropName:(NSString *)name propValue:(id)prop {
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if ([@"columnSpace" isEqualToString:name]) {
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self.columnSpace = [prop floatValue];
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[self.view.collectionViewLayout invalidateLayout];
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} else if ([@"rowSpace" isEqualToString:name]) {
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self.rowSpace = [prop floatValue];
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[self.view.collectionViewLayout invalidateLayout];
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} else if ([@"columnCount" isEqualToString:name]) {
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self.columnCount = [prop unsignedIntegerValue];
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[self.view reloadData];
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[self.view.collectionViewLayout invalidateLayout];
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} else if ([@"itemCount" isEqualToString:name]) {
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self.itemCount = [prop unsignedIntegerValue];
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[self.view reloadData];
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} else if ([@"renderItem" isEqualToString:name]) {
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if ([self.renderItemFuncId isEqualToString:prop]) {
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} else {
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[self.itemViewIds removeAllObjects];
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[self clearSubModel];
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[self.view reloadData];
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self.renderItemFuncId = prop;
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}
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} else if ([@"batchCount" isEqualToString:name]) {
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self.batchCount = [prop unsignedIntegerValue];
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} else if ([@"onLoadMore" isEqualToString:name]) {
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self.onLoadMoreFuncId = prop;
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} else if ([@"loadMoreView" isEqualToString:name]) {
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self.loadMoreViewId = prop;
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} else if ([@"loadMore" isEqualToString:name]) {
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self.loadMore = [prop boolValue];
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} else {
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[super blendView:view forPropName:name propValue:prop];
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}
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}
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- (NSDictionary *)itemModelAt:(NSUInteger)position {
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if (position >= self.itemCount) {
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return [self subModelOf:self.loadMoreViewId];
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}
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NSString *viewId = self.itemViewIds[@(position)];
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if (viewId && viewId.length > 0) {
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return [self subModelOf:viewId];
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} else {
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DoricAsyncResult *result = [self callJSResponse:@"renderBunchedItems", @(position), @(self.batchCount), nil];
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JSValue *models = [result waitUntilResult];
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NSArray *array = [models toArray];
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[array enumerateObjectsUsingBlock:^(NSDictionary *obj, NSUInteger idx, BOOL *stop) {
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NSString *thisViewId = obj[@"id"];
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[self setSubModel:obj in:thisViewId];
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NSUInteger pos = position + idx;
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self.itemViewIds[@(pos)] = thisViewId;
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}];
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return array[0];
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}
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}
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- (DoricViewNode *)subNodeWithViewId:(NSString *)viewId {
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__block DoricViewNode *ret = nil;
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[self.doricContext.driver ensureSyncInMainQueue:^{
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for (UICollectionViewCell *collectionViewCell in self.view.visibleCells) {
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if ([collectionViewCell isKindOfClass:[DoricFlowLayoutViewCell class]]) {
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DoricFlowLayoutItemNode *node = ((DoricFlowLayoutViewCell *) collectionViewCell).viewNode;
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if ([viewId isEqualToString:node.viewId]) {
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ret = node;
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break;
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}
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}
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}
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}];
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return ret;
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}
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- (void)blendSubNode:(NSDictionary *)subModel {
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dispatch_async(dispatch_get_main_queue(), ^{
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NSString *viewId = subModel[@"id"];
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DoricViewNode *viewNode = [self subNodeWithViewId:viewId];
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if (viewNode) {
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[viewNode blend:subModel[@"props"]];
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} else {
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NSMutableDictionary *model = [[self subModelOf:viewId] mutableCopy];
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[self recursiveMixin:subModel to:model];
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[self setSubModel:model in:viewId];
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}
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[self.itemViewIds enumerateKeysAndObjectsUsingBlock:^(NSNumber *_Nonnull key, NSString *_Nonnull obj, BOOL *_Nonnull stop) {
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if ([viewId isEqualToString:obj]) {
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*stop = YES;
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NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[key integerValue] inSection:0];
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[UIView performWithoutAnimation:^{
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[self.view reloadItemsAtIndexPaths:@[indexPath]];
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}];
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}
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}];
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});
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}
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- (void)callItem:(NSUInteger)position size:(CGSize)size {
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NSValue *old = self.itemSizeInfo[@(position)];
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if (old && CGSizeEqualToSize([old CGSizeValue], size)) {
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return;
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}
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self.itemSizeInfo[@(position)] = [NSValue valueWithCGSize:size];
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[self.view.collectionViewLayout invalidateLayout];
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}
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- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
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return self.itemCount + (self.loadMore ? 1 : 0);
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}
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- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
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NSUInteger position = (NSUInteger) indexPath.row;
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NSDictionary *model = [self itemModelAt:position];
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NSDictionary *props = model[@"props"];
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DoricFlowLayoutViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"doricCell" forIndexPath:indexPath];
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if (!cell.viewNode) {
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DoricFlowLayoutItemNode *itemNode = [[DoricFlowLayoutItemNode alloc] initWithContext:self.doricContext];
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[itemNode initWithSuperNode:self];
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cell.viewNode = itemNode;
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[cell.contentView addSubview:itemNode.view];
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}
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DoricFlowLayoutItemNode *node = cell.viewNode;
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node.viewId = model[@"id"];
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[node blend:props];
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CGFloat width = (collectionView.width - (self.columnCount - 1) * self.columnSpace) / self.columnCount;
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CGSize size = [node.view measureSize:CGSizeMake(width, collectionView.height)];
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if (position > 0 && position >= self.itemCount && self.onLoadMoreFuncId) {
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size = CGSizeMake(collectionView.width, size.height);
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[self callJSResponse:self.onLoadMoreFuncId, nil];
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}
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[node.view layoutSelf:size];
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[self callItem:position size:size];
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return cell;
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}
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- (CGFloat)doricFlowLayoutItemHeightAtIndexPath:(NSIndexPath *)indexPath {
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NSUInteger position = (NSUInteger) indexPath.row;
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NSValue *value = self.itemSizeInfo[@(position)];
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if (value) {
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return [value CGSizeValue].height;
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} else {
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return 100;
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}
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}
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- (CGFloat)doricFlowLayoutItemWidthAtIndexPath:(NSIndexPath *)indexPath {
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NSUInteger position = (NSUInteger) indexPath.row;
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NSValue *value = self.itemSizeInfo[@(position)];
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if (value) {
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return [value CGSizeValue].width;
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} else {
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return 100;
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}
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}
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- (CGFloat)doricFlowLayoutColumnSpace {
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return self.columnSpace;
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}
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- (CGFloat)doricFlowLayoutRowSpace {
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return self.rowSpace;
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}
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- (NSInteger)doricFlowLayoutColumnCount {
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return self.columnCount;
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}
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
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for (DoricDidScrollBlock block in self.didScrollBlocks) {
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block(scrollView);
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}
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}
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- (NSMutableSet<DoricDidScrollBlock> *)didScrollBlocks {
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if (!_didScrollBlocks) {
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_didScrollBlocks = [NSMutableSet new];
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}
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return _didScrollBlocks;
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}
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- (void)addDidScrollBlock:(__nonnull DoricDidScrollBlock)didScrollListener {
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[self.didScrollBlocks addObject:didScrollListener];
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}
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- (void)removeDidScrollBlock:(__nonnull DoricDidScrollBlock)didScrollListener {
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[self.didScrollBlocks removeObject:didScrollListener];
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}
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@end
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