UICollectionViewLayout CreateLayout()
{
var itemSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(1),
NSCollectionLayoutDimension.CreateFractionalHeight(1));
var item = NSCollectionLayoutItem.Create(itemSize);
var groupSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(1),
NSCollectionLayoutDimension.CreateAbsolute(44));
var group = NSCollectionLayoutGroup.CreateHorizontal(groupSize, item);
var section = NSCollectionLayoutSection.Create(group);
section.InterGroupSpacing = 5;
section.ContentInsets = new NSDirectionalEdgeInsets(0, 10, 0, 10);
var headerFooterSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(1),
NSCollectionLayoutDimension.CreateAbsolute(44));
var sectionHeader = NSCollectionLayoutBoundarySupplementaryItem.Create(headerFooterSize, sectionHeaderElementKind, NSRectAlignment.Top);
var sectionFooter = NSCollectionLayoutBoundarySupplementaryItem.Create(headerFooterSize, sectionFooterElementKind, NSRectAlignment.Bottom);
sectionHeader.PinToVisibleBounds = true;
sectionHeader.ZIndex = 2;
section.BoundarySupplementaryItems = new [] { sectionHeader, sectionFooter };
var layout = new UICollectionViewCompositionalLayout(section);
return(layout);
}
UICollectionViewLayout CreateLayout()
{
var config = new UICollectionViewCompositionalLayoutConfiguration {
InterSectionSpacing = 20
};
return(new UICollectionViewCompositionalLayout(SectionProviderHandler, config));
NSCollectionLayoutSection SectionProviderHandler(nint sectionIndex, INSCollectionLayoutEnvironment layoutEnvironment)
{
var itemSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(1),
NSCollectionLayoutDimension.CreateFractionalHeight(1));
var item = NSCollectionLayoutItem.Create(itemSize);
// if we have the space, adapt and go 2-up + peeking 3rd item
var groupFractionalWidth = layoutEnvironment.Container.EffectiveContentSize.Width > 500 ? 0.425f : 0.85f;
var groupSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(groupFractionalWidth),
NSCollectionLayoutDimension.CreateAbsolute(250));
var group = NSCollectionLayoutGroup.CreateHorizontal(groupSize, item);
var section = NSCollectionLayoutSection.Create(group);
section.OrthogonalScrollingBehavior = UICollectionLayoutSectionOrthogonalScrollingBehavior.Continuous;
section.InterGroupSpacing = 20;
section.ContentInsets = new NSDirectionalEdgeInsets(0, 20, 0, 20);
var titleSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(1),
NSCollectionLayoutDimension.CreateEstimated(44));
var titleSupplementary = NSCollectionLayoutBoundarySupplementaryItem.Create(titleSize, titleElementKind, NSRectAlignment.Top);
section.BoundarySupplementaryItems = new [] { titleSupplementary };
return(section);
}
}
// +-----------------------------------------------------+
// | +---------------------------------+ +-----------+ |
// | | | | | |
// | | | | | |
// | | | | 1 | |
// | | | | | |
// | | | | | |
// | | | +-----------+ |
// | | 0 | |
// | | | +-----------+ |
// | | | | | |
// | | | | | |
// | | | | 2 | |
// | | | | | |
// | | | | | |
// | +---------------------------------+ +-----------+ |
// +-----------------------------------------------------+
UICollectionViewLayout CreateLayout()
{
var config = new UICollectionViewCompositionalLayoutConfiguration {
InterSectionSpacing = 20
};
return(new UICollectionViewCompositionalLayout(SectionProviderHandler, config));
NSCollectionLayoutSection SectionProviderHandler(nint sectionIndex, INSCollectionLayoutEnvironment layoutEnvironment)
{
var sectionKind = SectionKind.GetSectionKind(sectionIndex);
var leadingItemSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(.7f),
NSCollectionLayoutDimension.CreateFractionalHeight(1));
var leadingItem = NSCollectionLayoutItem.Create(leadingItemSize);
leadingItem.ContentInsets = new NSDirectionalEdgeInsets(10, 10, 10, 10);
var trailingItemSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(1),
NSCollectionLayoutDimension.CreateFractionalHeight(.3f));
var trailingItem = NSCollectionLayoutItem.Create(trailingItemSize);
trailingItem.ContentInsets = new NSDirectionalEdgeInsets(10, 10, 10, 10);
var trailingGroupSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(.3f),
NSCollectionLayoutDimension.CreateFractionalHeight(1));
var trailingGroup = NSCollectionLayoutGroup.CreateVertical(trailingGroupSize, trailingItem, 2);
var orthogonallyScrolls = sectionKind.GetOrthogonalScrollingBehavior() != UICollectionLayoutSectionOrthogonalScrollingBehavior.None;
var containerGroupFractionalWidth = orthogonallyScrolls ? .85f : 1;
var containerGroupSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(containerGroupFractionalWidth),
NSCollectionLayoutDimension.CreateFractionalHeight(.4f));
var containerGroup = NSCollectionLayoutGroup.CreateHorizontal(containerGroupSize, leadingItem, trailingGroup);
var section = NSCollectionLayoutSection.Create(containerGroup);
section.OrthogonalScrollingBehavior = sectionKind.GetOrthogonalScrollingBehavior();
var sectionHeaderSize = NSCollectionLayoutSize.Create(NSCollectionLayoutDimension.CreateFractionalWidth(1),
NSCollectionLayoutDimension.CreateAbsolute(44));
var sectionHeader = NSCollectionLayoutBoundarySupplementaryItem.Create(sectionHeaderSize, headerElementKind, NSRectAlignment.Top);
section.BoundarySupplementaryItems = new [] { sectionHeader };
return(section);
}
}