A SwiftUI-style DSL for generating NSMenu instances for AppKit.
I'd done this for DSFAppKitBuilder and thought I'd pull it out into its own micro-framework.
Creates a menu with 'cut, copy, paste, separator, clear selection' with enablers and actions
let menu = NSMenu {
MenuItem("Cut")
.enabled { [weak self] in self?.hasSelection ?? false }
.onAction { [weak self] in /* perform cut action */ }
MenuItem("Copy")
.enabled { [weak self] in self?.hasSelection ?? false }
.onAction { [weak self] in /* perform copy action */ }
MenuItem("Paste")
.enabled { [weak self] in self?.clipboardHasText ?? false }
.onAction { [weak self] in /* perform paste action */ }
Separator()
MenuItem("Clear selection")
.onAction { [weak self] in /* clear the current selection */ }
}
menu.popUp(
positioning: nil,
at: .init(x: sender.bounds.minX, y: sender.bounds.maxY),
in: sender
)Bigger Example
// A fictional NSViewController that displays an interactive position matrix
let positionMatrixViewController = PositionMatrixViewController()
// A menu to be displayed as a submenu of the main menu
private lazy var presets = Menu {
MenuItem("Github")
.onAction { [weak self] in
// Change the style to github
}
}
MenuItem("BitBucket")
.onAction { [weak self] in
// Change the style to bitbucket
}
}
}
let menu = Menu {
MenuItem("Convert tabs to spaces")
.onAction { [weak self] in /* perform tabs to spaces */ }
MenuItem("Convert spaces to tabs")
.onAction { [weak self] in /* perform spaces to tabs */ }
Separator()
ViewItem("Position Matrix", positionMatrixViewController)
Separator()
MenuItem("Preset Styles", subMenu: presets)
}A basic separator.
A standard menu item, providing
- setting the title (
.title()) - setting the enabled status (
.enabled()) - setting the attributedTitle (
.attributedTitle()) - setting the state (on, off, mixed) (
.state()) - setting the shortcut key (
.shortcutKey()) - setting the indentation level (
.indentationLevel()) - setting the NSUserInterfaceItemIdentifier identifier (
.identifier()) - setting the basic image (
.image()) - setting the state images (
.stateImage())
The MenuItemCollection menu item is a mechanism for creating a menu item for each 'object' in a collection of objects.
For example, you might have a collection of names to add to a menu, you can use a MenuItemCollection object
to iterate over the collection and generate a series of menu items for each collection item.
MenuItemCollection(1...4) { [weak self] item in
MenuItem("Item \(item)")
.tag(item)
.onAction {
Swift.print("\(item)")
}
Separator()
}A view item contains a custom view. The view can either come from an NSViewController or a SwiftUI view.
The ViewItem inherits from MenuItem so it gets all the properties provided by MenuItem
ViewItem("NSViewController menu item title", /* some NSViewController */)If you want to supply an action to a ViewItem, you'll need to manually trigger the action as part of your
custom NSViewController instance
override func mouseUp(with event: NSEvent) {
super.mouseUp(with: event)
self.performActionForViewItemAndDismiss()
}ViewItem("SwiftUI View menu item title", /* some SwiftUI view */)SwiftUI view example
Integrating a SwiftUI view is straightforward, however getting values in and out of the view can get a little tricky.
class SwiftUIModel {
var doubleValue: Double = 20
}
struct SwiftUIMenuItemView: View {
let model: SwiftUIModel
@State var currentValue: Double
init(model: SwiftUIModel) {
self.model = model
currentValue = model.doubleValue
}
var body: some View {
let valueBinding = Binding<Double>(
get: {
self.currentValue
},
set: {
self.currentValue = $0
self.model.doubleValue = $0
}
)
VStack(alignment: .leading, spacing: 0) {
Text("Using a SwiftUI view").font(.callout)
HStack {
Slider(value: valueBinding, in: 0 ... 100).controlSize(.small)
.frame(maxWidth: .infinity)
Text("\(currentValue, specifier: "%.1f")")
.frame(maxWidth: 38)
}
}
.padding(EdgeInsets(top: 4, leading: 12, bottom: 4, trailing: 12))
}
}
let menu = NSMenu {
ViewItem("SwiftUI", SwiftUIMenuItemView(model: swiftUIModel))
}MIT. Use it for anything you want, just attribute my work if you do. Let me know if you do use it somewhere, I'd love to hear about it!
MIT License
Copyright (c) 2022 Darren Ford
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.