SwiftUI on macOS - handle single-click and double-click at the same time

Question

Consider this view in SwiftUI:

struct MyView: View {
    var body: some View {
        Rectangle()
            .fill(Color.blue)
            .frame(width: 200, height: 200)
            .onTapGesture {
                print("single clicked")
            }
    }
}

Now we're handling single-click. Say you wanna handle double-click too, but with a separate callback.

You have 2 options:

Add double click handler after single click - this doesn't work at all
Add double click handler before single click handler, this kinda works:

struct MyView: View {
    var body: some View {
        Rectangle()
            .fill(Color.blue)
            .frame(width: 200, height: 200)
            .onTapGesture(count: 2) {
                print("double clicked")
            }
            .onTapGesture {
                print("single clicked")
            }
    }
}

Double-click handler is called properly, but single-click handler is called after a delay of about 250ms.

Any ideas how to resolve this?

another approach with registering right tap gesture, here: stackoverflow.com/a/66432412/14998134 — swiftPunk
– swiftPunk, Commented Mar 2, 2021 at 3:44
In Monterey this means I get either a single or a double-click, which is exactly what I wanted. — green_knight
– green_knight, Commented Apr 29, 2022 at 8:46

Martijn Pieters · Accepted Answer · 2022-08-23 14:24:18Z

24

Here is possible approach (tested with Xcode 11.2 / macOS 10.15)

struct MyView: View {
    var body: some View {
        Rectangle()
            .fill(Color.blue)
            .frame(width: 200, height: 200)
            .gesture(TapGesture(count: 2).onEnded {
                print("double clicked")
            })
            .simultaneousGesture(TapGesture().onEnded {
                print("single clicked")
            })
    }
}

edited Aug 23, 2022 at 14:24

Martijn Pieters

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answered Jan 30, 2020 at 18:19

Asperi

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6 Comments

El Tomato Over a year ago

Hmm... It seems that you will get both called when you double-tap the rectangle.

ixany Over a year ago

Works as expected on macOS 11.2 (Big Sur).

Guy Brooker Over a year ago

Doesn't seem to work under macCatalyst though

swiftPunk Over a year ago

@ElTomato: there is a possible salvation for registering right tap gesture, here: stackoverflow.com/a/66432412/14998134

Klajd Deda Over a year ago

Works on Big Sur, 11.4

|

Accatyyc · Accepted Answer · 2022-04-05 12:52:27Z

The gesture-based solutions don't work correctly when selection is enabled on the List, since the first tap will delay the actual selection. I have made a double click modifier which works on any view and seems to solve it the way I expect in all cases:

extension View {
    /// Adds a double click handler this view (macOS only)
    ///
    /// Example
    /// ```
    /// Text("Hello")
    ///     .onDoubleClick { print("Double click detected") }
    /// ```
    /// - Parameters:
    ///   - handler: Block invoked when a double click is detected
    func onDoubleClick(handler: @escaping () -> Void) -> some View {
        modifier(DoubleClickHandler(handler: handler))
    }
}

struct DoubleClickHandler: ViewModifier {
    let handler: () -> Void
    func body(content: Content) -> some View {
        content.overlay {
            DoubleClickListeningViewRepresentable(handler: handler)
        }
    }
}

struct DoubleClickListeningViewRepresentable: NSViewRepresentable {
    let handler: () -> Void
    func makeNSView(context: Context) -> DoubleClickListeningView {
        DoubleClickListeningView(handler: handler)
    }
    func updateNSView(_ nsView: DoubleClickListeningView, context: Context) {}
}

class DoubleClickListeningView: NSView {
    let handler: () -> Void

    init(handler: @escaping () -> Void) {
        self.handler = handler
        super.init(frame: .zero)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func mouseDown(with event: NSEvent) {
        super.mouseDown(with: event)
        if event.clickCount == 2 {
            handler()
        }
    }
}

https://gist.github.com/joelekstrom/91dad79ebdba409556dce663d28e8297

This is the only way that I've managed to have a $selection and double click working. Kudos sir!

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