Issue #437
Normal
Use Omnia for itemId extension
HeaderCell.swift
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| final class HeaderCell: NSView, NSCollectionViewSectionHeaderView {
let label: NSTextField = withObject(NSTextField(labelWithString: "")) {
$0.textColor = R.color.header
$0.font = R.font.header
$0.alignment = .left
$0.lineBreakMode = .byTruncatingTail
}
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
addSubviews([label])
activate(
label.anchor.centerY,
label.anchor.left.constant(8)
)
}
required init?(coder: NSCoder) {
fatalError()
}
}
|
ViewController.swift
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| collectionView.register(
HeaderCell.self,
forSupplementaryViewOfKind: NSCollectionView.elementKindSectionHeader,
withIdentifier: HeaderCell.itemId
)
func collectionView(_ collectionView: NSCollectionView, viewForSupplementaryElementOfKind kind: NSCollectionView.SupplementaryElementKind, at indexPath: IndexPath) -> NSView {
if kind == NSCollectionView.elementKindSectionHeader {
let view = collectionView.makeSupplementaryView(
ofKind: kind,
withIdentifier: HeaderCell.itemId,
for: indexPath
) as! HeaderCell
let menu = app.menus[indexPath.section]
view.label.stringValue = menu.name
return view
} else {
return NSView()
}
}
|
In generic subclass
If use CollectionViewHandler from Omnia, then need to add @objc due to a bug in Swift compiler for subclassing generic class
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| @objc (collectionView:viewForSupplementaryElementOfKind:atIndexPath:)
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MyHandler.swift
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| import AppKit
import Omnia
class MyHandler: CollectionViewHandler<App.Key, KeyCell> {
override init() {
super.init()
layout.headerReferenceSize = NSSize(width: 300, height: 30)
collectionView.register(
HeaderCell.self,
forSupplementaryViewOfKind: NSCollectionView.elementKindSectionHeader,
withIdentifier: HeaderCell.itemId
)
}
@objc (collectionView:viewForSupplementaryElementOfKind:atIndexPath:)
func collectionView(_ collectionView: NSCollectionView, viewForSupplementaryElementOfKind kind: NSCollectionView.SupplementaryElementKind, at indexPath: IndexPath) -> NSView {
if kind == NSCollectionView.elementKindSectionHeader {
let view = collectionView.makeSupplementaryView(
ofKind: kind,
withIdentifier: HeaderCell.itemId,
for: indexPath
) as! HeaderCell
let menu = app.menus[indexPath.section]
view.label.stringValue = menu.name
return view
} else {
return NSView()
}
}
}
|
Use Omnia
Use CollectionViewSectionHandler from Omnia
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| class SectionHandler: CollectionViewSectionHandler<App.Key, KeyCell, HeaderCell> {
}
sectionHandler.configureHeader = { section, view in
view.label.stringValue = section.name
}
sectionHandler.configure = { item, cell in
cell.shortcutLabel.stringValue = item.shortcut
cell.nameLabel.stringValue = item.name
}
sectionHandler.itemSize = { [weak self] in
guard let self = self else {
return .zero
}
let width = self.sectionHandler.collectionView.frame.size.width
- self.sectionHandler.layout.sectionInset.left
- self.sectionHandler.layout.sectionInset.right
return CGSize(width: width, height: 18)
}
|
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