DSFQuickActionBar

A spotlight-inspired quick action bar for macOS.

I've seen this in other mac applications (particularly Spotlight and Boop) and it's very useful and convenient.

• macOS AppKit Swift Support
• macOS AppKit SwiftUI Support
• Completely keyboard navigable
• Optional keyboard shortcuts
• Asynchronous API to avoid beachballing on complex queries.

You can present a quick action bar in the context of a window (where it will be centered above and within the bounds of the window as is shown in the image above) or centered in the current screen (like Spotlight currently does).

You can find macOS demo apps in the Demos subfolder.

• Simple Demo - a simple AppKit application demonstrating a synchronous quick action bar using AppKit, SwiftUI and custom cell types
• Doco Demo - AppKit demo used for generating images for the website
• Faux Spotlight - An AppKit demo showing asynchronous searching support using MDItemQuery()
• SwiftUI Demo - A SwiftUI demonstration
• StatusBar Item Demo - Demonstrates displaying a quick action bar from a statusbar item (in the menu).

1. Present the quick action bar, automatically focussing on the edit field so your hands can stay on the keyboard
2. User starts typing in the search field
3. For each change to the search term -
   1. The contentSource will be asked for the item(s) that 'match' the search term (itemsForSearchTerm). The items request is asynchronous, and can be completed at any point in the future (as long as it hasn't been cancelled by another search request)
   2. For each item, the contentSource will be asked to provide a view which will appear in the result table for that item (viewForItem)
   3. When the user either double-clicks on, or presses the return key on a selected item row, the contentSource will be provided with the item (didActivateItem)
4. The quick action bar will automatically dismiss if
   1. The user clicks outside the quick action bar (ie. it loses focus)
   2. The user presses the escape key
   3. The user double-clicks an item in the result table
   4. The user selects a row and presses 'return'

You present a quick action bar by :-

1. creating an instance of DSFQuickActionBar
2. set the content source on the instance
3. call the present method.

Call the present method on the quick action bar instance.

The contentSource (DSFQuickActionBarContentSource) provides the content and feedback for the quick action bar. The basic mechanism is similar to NSTableViewDataSource/NSTableViewDelegate in that the control will :-

1. query the contentSource for items matching a search term (itemsForSearchTerm)
2. ask the contentSource for a view for each displayed item (viewForItem)
3. indicate that the user has pressed/clicked a selection in the results.
4. (optional) indicate to the contentSource that the quick action bar has been dismissed.

func quickActionBar(_ quickActionBar: DSFQuickActionBar, itemsForSearchTermTask task: DSFQuickActionBar.SearchTask)

Called when the control needs a array of items to display within the control that match a search term. The definition of 'match' is entirely up to you - you can perform any check you want.

The task object contains the search term and a completion block to call when the search results become available. If the search text changes during an asynchronous search call the task is marked as invalid and the result will be ignored.

If you have code using the old synchronous API, it's relatively straightforward to convert your existing code to the new api.

func quickActionBar(_ quickActionBar: DSFQuickActionBar, itemsForSearchTermTask task: DSFQuickActionBar.SearchTask)
   let results = countryNames.filter { $0.name.startsWith(task.searchTerm) }
   task.complete(with: results)
}

var currentSearch: SomeRemoteSearchMechanism?
func quickActionBar(_ quickActionBar: DSFQuickActionBar, itemsForSearchTermTask task: DSFQuickActionBar.SearchTask)
   currentSearch?.cancel()
   currentSearch = SomeRemoteSearchMechanism(task.searchTerm) { [weak self] results in
      task.complete(with: results)
      self?.currentSearch = nil
   }
}

func quickActionBar(_ quickActionBar: DSFQuickActionBar, viewForItem item: AnyHashable, searchTerm: String) -> NSView?

Return the view to be displayed in the row for the item. The search term is also provided to allow the view to be customized for the search term (eg. highlighting the match in the name)

func quickActionBar(_ quickActionBar: DSFQuickActionBar, canSelectItem item: AnyHashable) -> Bool

Called when a item will be selected (eg. by keyboard navigation or clicking). Return false if this row should not be selected (eg. it's a separator)

func quickActionBar(_ quickActionBar: DSFQuickActionBar, didSelectItem item: AnyHashable)

Called when an item is selected within the list.

// Swift
func quickActionBar(_ quickActionBar: DSFQuickActionBar, didActivateItem item: AnyHashable)

Indicates the user activated an item in the result list. The 'item' parameter is the item that was selected by the user

func quickActionBarDidCancel(_ quickActionBar: DSFQuickActionBar)

Called if the user cancels the quick action bar (eg. by hitting the esc key or clicking outside the bar)

class ViewController: NSViewController {
   let quickActionBar = DSFQuickActionBar()
   override func viewDidLoad() {
      super.viewDidLoad()

      // Set the content source for the quick action bar
      quickActionBar.contentSource = self
   }

   @IBAction func selectFilter(_ sender: Any) {
      // Present the quick action bar
      quickActionBar.present(placeholderText: "Search for filters…")
   }
}

// ContentSource delegate calls
extension ViewController: DSFQuickActionBarContentSource {
   func quickActionBar(_ quickActionBar: DSFQuickActionBar, itemsForSearchTerm searchTerm: String) -> [AnyHashable] {
      return Filter.search(searchTerm)
   }

   func quickActionBar(_ quickActionBar: DSFQuickActionBar, viewForItem item: AnyHashable, searchTerm: String) -> NSView? {
      guard let filter = item as? Filter else { fatalError() }
      // For the demo, just return a simple text field with the filter's name
      return NSTextField(labelWithString: filter.userPresenting)
   }

   func quickActionBar(_ quickActionBar: DSFQuickActionBar, didActivateItem item: AnyHashable) {
      Swift.print("Activated item \(item as? Filter)")
   }
   
   func quickActionBarDidCancel(_ quickActionBar: DSFQuickActionBar) {
      Swift.print("Cancelled!")
   }
}

// the datasource for the Quick action bar. Each filter represents a CIFilter
struct Filter: Hashable, CustomStringConvertible {
   let name: String // The name is unique within our dataset, thus the default equality will be enough to uniquely identify
   var userPresenting: String { return CIFilter.localizedName(forFilterName: self.name) ?? self.name }
   var description: String { name }

   // All of the available filters
   static var AllFilters: [Filter] = {
      let filterNames = CIFilter.filterNames(inCategory: nil).sorted()
      return filterNames.map { name in Filter(name: name) }
   }()

   // Return filters matching the search term
   static func search(_ searchTerm: String) -> [Filter] {
      if searchTerm.isEmpty { return AllFilters }
      return Filter.AllFilters
         .filter { $0.userPresenting.localizedCaseInsensitiveContains(searchTerm) }
         .sorted(by: { a, b in a.userPresenting < b.userPresenting })
   }
}

The SwiftUI implementation is a View. You 'install' the quick action bar just like you would any other SwiftUI view. The QuickActionBar view is zero-sized, and does not display content within the view its installed on.

QuickActionBar<IdentifyingObject, IdentifyingObjectView>

The QuickActionBar template parameters represent

• IdentifyingObject is the type of the object (eg. URL)
• IdentifyingObjectView is the type of View used to represent IdentifyingObject in the results list (eg. Text)

You present the quick action bar by setting the visible parameter to true.

For example :-

@State var quickActionBarVisible = false
@State var selectedItem: URL = URL(...)
...
VStack {
   Button("Show Quick Action Bar") {
      quickActionBarVisible = true
   }
   QuickActionBar<URL, Text>(
      location: .window,
      visible: $quickActionBarVisible,
      selectedItem: $selectedItem,
      placeholderText: "Open Quickly",
      itemsForSearchTerm: { searchTask in
         let results = /* array of matching URLs */
         searchTask.complete(with: results)
      },
      viewForItem: { url, searchTerm in
         Text(url.path)
      }
   )
   .onChange(of: selectedItem) { newValue in
      Swift.print("Selected item \(newValue)")
   }
}
...

struct DocoContentView: View {
   // Binding to update when the user selects a filter
   @State var selectedFilter: Filter?
   // Binding to show/hide the quick action bar
   @State var quickActionBarVisible = false

   var body: some View {
      VStack {
         Button("Show Quick Action Bar") {
            quickActionBarVisible = true
         }
         QuickActionBar<Filter, Text>(
            location: .screen,
            visible: $quickActionBarVisible,
            selectedItem: $selectedFilter,
            placeholderText: "Open Quickly...",
            itemsForSearchTerm: { searchTask in
               let results = filters__.search(searchTask.searchTerm)
               searchTask.complete(with: results)
            },
            viewForItem: { filter, searchTerm in
               Text(filter.userPresenting)
            }
         )
      }
   }
}

/// The unique object used as the quick action bar item
struct Filter: Hashable, CustomStringConvertible {
   let name: String // The name is unique within our dataset, therefore it will be our identifier
   var userPresenting: String { return CIFilter.localizedName(forFilterName: self.name) ?? self.name }
   var description: String { name }
}

class Filters {
   // If true, displays all of the filters if the search term is empty
   var showAllIfEmpty = true

   // All the filters
   var all: [Filter] = {
      let filterNames = CIFilter.filterNames(inCategory: nil).sorted()
      return filterNames.map { name in Filter(name: name) }
   }()

   // Return filters matching the search term
   func search(_ searchTerm: String) -> [Filter] {
      if searchTerm.isEmpty && showAllIfEmpty { return all }
      return all
         .filter { $0.userPresenting.localizedCaseInsensitiveContains(searchTerm) }
         .sorted(by: { a, b in a.userPresenting < b.userPresenting })
   }
}

let filters__ = Filters()

MIT. Use it and abuse it for anything you want, just attribute my work. Let me know if you do use it somewhere, I'd love to hear about it!

MIT License

Copyright © 2022 Darren Ford

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