61 lines
2.2 KiB
Objective-C
61 lines
2.2 KiB
Objective-C
/*
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* Copyright [2023] [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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// DoricSliderNode.m
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// Doric
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//
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// Created by jingpeng.wang on 2023/6/13.
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//
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#import "DoricSliderLayout.h"
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@implementation DoricSliderLayout
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- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect {
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NSArray *attributes = [super layoutAttributesForElementsInRect:rect];
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CGRect visitRect = {self.collectionView.contentOffset,self.collectionView.bounds.size};
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NSMutableArray *attributesCopy = [NSMutableArray array];
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for (UICollectionViewLayoutAttributes *attribute in attributes) {
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UICollectionViewLayoutAttributes *attributeCopy = [attribute copy];
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[attributesCopy addObject:attributeCopy];
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}
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for (UICollectionViewLayoutAttributes *attribute in attributesCopy) {
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CGFloat distance = CGRectGetMidX(visitRect) - attribute.center.x;
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float diff = fabs(distance);
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CATransform3D scaleTransform = CATransform3DIdentity;
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if (diff >= 0 && diff <= self.galleryItemWidth) {
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float scale = 1 - (1 - self.galleryMinScale) * (diff / self.galleryItemWidth);
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scaleTransform = CATransform3DMakeScale(scale, scale, scale);
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attribute.alpha = 1 - (1 - self.galleryMinAlpha) * (diff / self.galleryItemWidth);
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} else {
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float scale = self.galleryMinScale;
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scaleTransform = CATransform3DMakeScale(scale, scale, scale);
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attribute.alpha = self.galleryMinAlpha;
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}
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attribute.transform3D = scaleTransform;
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}
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return attributesCopy;
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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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@end
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