SwiftUI gestures in the toolbar area ignored - swift

Question

I'd like to implement a custom slider SwiftUI component and put it on the toolbar area of a SwiftUI Mac app. However the gesture of the control gets ignored as the system's window moving gesture takes priority. This problem does not occur for the system UI controls, like Slider or Button.
How to fix the code below so the slider works in the toolbar area as well, not just inside the window similar to the default SwiftUI components?
struct MySlider: View {
#State var offset: CGFloat = 0.0
var body: some View {
GeometryReader { gr in
let thumbSize = gr.size.height
let maxValue = (gr.size.width - thumbSize) / 2.0
let gesture = DragGesture(minimumDistance: 0).onChanged { v in
self.offset = max(min(v.translation.width, maxValue), -maxValue)
}
ZStack {
Capsule()
Circle()
.foregroundColor(Color.yellow)
.frame(width: thumbSize, height: thumbSize)
.offset(x: offset)
.highPriorityGesture(gesture)
}
}.frame(width: 100, height: 20)
}
}
struct ContentView: View {
#State var value = 0.5
var body: some View {
MySlider()
.toolbar {
MySlider()
Slider(value: $value).frame(width: 100, height: 20)
}.frame(width: 500, height: 100)
}
}

Answer 1

Looks like design limitation (or not implemented yet feature - Apple does not see such view as user interaction capable item).
A possible workaround is to wrap you active element into button style. The button as a container interpreted as user-interaction-able area but all drawing and handling is in your code.
Tested with Xcode 13.2 / macOS 12.2
Note: no changes in your slider logic
struct MySlider: View {
var body: some View {
Button("") {}.buttonStyle(SliderButtonStyle())
}
struct SliderButtonStyle: ButtonStyle {
func makeBody(configuration: Configuration) -> some View {
MySliderContent()
}
struct MySliderContent: View {
#State var offset: CGFloat = 0.0
var body: some View {
GeometryReader { gr in
let thumbSize = gr.size.height
let maxValue = (gr.size.width - thumbSize) / 2.0
let gesture = DragGesture(minimumDistance: 0).onChanged { v in
self.offset = max(min(v.translation.width, maxValue), -maxValue)
}
ZStack {
Capsule()
Circle()
.foregroundColor(Color.yellow)
.frame(width: thumbSize, height: thumbSize)
.offset(x: offset)
.highPriorityGesture(gesture)
}
}.frame(width: 100, height: 20)
}
}
}
}