110 lines
3.6 KiB
Objective-C
Executable File
110 lines
3.6 KiB
Objective-C
Executable File
/*
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MIT License (MIT)
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Copyright (c) 2015 Clement CN Tsang
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#import "CTAssetsGridViewLayout.h"
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@implementation CTAssetsGridViewLayout
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- (instancetype)initWithContentSize:(CGSize)contentSize traitCollection:(UITraitCollection *)traits
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{
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if (self = [super init])
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{
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CGFloat scale = traits.displayScale;
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NSInteger numberOfColumns = [self numberOfColumnsForTraitCollection:traits];
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CGFloat onePixel = (scale == 3.0) ? (2.0 / scale) : (1.0 / scale);
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// spacing is as small as possible
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self.minimumInteritemSpacing = onePixel;
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self.minimumLineSpacing = onePixel;
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// total spaces between items (in pixel)
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CGFloat spaces = self.minimumInteritemSpacing * (numberOfColumns - 1);
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// item length (in pixel)
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CGFloat length = (scale * (contentSize.width - spaces)) / numberOfColumns;
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// remaining spaces (in pixel) after rounding the length to integer
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CGFloat insets = (length - floor(length)) * numberOfColumns;
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// round the length to integer (in pixel)
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length = floor(length);
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// divide insets to two
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CGFloat left = insets / 2;
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CGFloat right = insets / 2;
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// adjust if insets is odd
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if (fmodf(insets, 2.0) == 1.0f)
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{
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left -= 0.5;
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right += 0.5;
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}
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// left / right insets (in point, 2 decimal)
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left = floorf(left / scale * 100) / 100;
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right = floorf(right / scale * 100) / 100;
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// item length (in point, 2 decimal)
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length = floorf(length / scale * 100) / 100;
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self.sectionInset = UIEdgeInsetsMake(0, left, 0, right);
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self.itemSize = CGSizeMake(length, length);
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self.footerReferenceSize = CGSizeMake(contentSize.width, floor(length * 2/3));
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}
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return self;
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}
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- (NSInteger)numberOfColumnsForTraitCollection:(UITraitCollection *)traits
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{
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switch (traits.userInterfaceIdiom) {
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case UIUserInterfaceIdiomPad:
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{
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return 6;
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break;
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}
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case UIUserInterfaceIdiomPhone:
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{
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// iPhone 6+ landscape
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if (traits.horizontalSizeClass == UIUserInterfaceSizeClassRegular)
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return 4;
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// iPhone landscape
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else if (traits.verticalSizeClass == UIUserInterfaceSizeClassCompact)
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return 6;
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// iPhone portrait
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else
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return 4;
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break;
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}
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default:
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return 4;
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break;
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}
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}
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@end
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