Swift UI Floating Window

ContentView.swift

struct ContentView: View {    
    @State var openWindow = false
    
    var body: some View {
        let window = FloatingWindow(
            isOpen: $openWindow,
            title: "Title",
            button: Text("ƒx").font(.system(size: 18, weight: .bold, design: .monospaced)),
            content: EmptyView()
        ).padding()
      
        return
            VStack {
              Spacer()
              HStack {
                Spacer()
                Text("Hello World")
                Spacer()
              }
              Spacer()
            }
            .animation(nil)
            .overlay(window, alignment: .bottomLeading)
            .edgesIgnoringSafeArea(.all)
    }
}

FloatingWindow.swift

struct FloatingWindow<ButtonView:View, ContentView:View>: View {
    
    @Binding var isOpen:Bool
    
    @State var offset:CGSize = .zero
    @State var tempOffset:CGSize = .zero
    
    var title:String?
    let button:ButtonView
    let content:ContentView
    
    let anim:Animation = Animation.spring().speed(1.8)
    
    func toggle(){
        withAnimation(self.anim) { self.isOpen.toggle() }
    }
    
    var body: some View {
        VStack(spacing: 0) {
            HStack {
                Button(action: toggle){
                    button
                    if isOpen && title != nil {
                        Text(title!)
                            .fontWeight(.semibold)
                            .opacity(0.7)
                            .transition(.opacity)
                    }
                }
                .accentColor(.orange)
                .frame(height: 54)
                .frame(minWidth: 54)
                .disabled(isOpen)
                
                if isOpen {
                    Spacer()
                    Button(action: toggle){
                        Image(systemName: "arrow.down.right.and.arrow.up.left")
                            .rotationEffect(Angle(degrees: 90))
                            .foregroundColor(.orange)
                            .font(.system(size: 22, weight: .semibold, design: .monospaced))
                    }.transition(.opacity)
                }
            }
            .padding(.horizontal, isOpen ? 14 : 0)
            .background(LinearGradient.charcoal)
            .zIndex(2)
            .gesture(
                DragGesture(coordinateSpace: .global).onChanged({ g in
                    self.offset = self.tempOffset + g.translation
                }).onEnded({ g in
                    withAnimation(self.anim) {
                        self.offset.width = self.offset.width.clamp(0, 65)
                        self.offset.height = self.offset.height.clamp(-660, 0)
                        self.tempOffset = self.offset
                    }
                })
            )
            
            if isOpen {
                content
                    .zIndex(1)
                    .overlay(Divider(), alignment: .top)
                    .transition(.opacity)
            }
        }
        .frame(maxWidth: isOpen ? 440 : 54)
        .background(Color.black)
        .colorScheme(.dark)
        .cornerRadius(isOpen ? 10 : 27)
        .shadow(radius: 10)
        .overlay(
            RoundedRectangle(cornerRadius: isOpen ? 10 : 27)
                .stroke(lineWidth: 0.5)
                .foregroundColor(Color.gray.opacity(0.6))
        )
        .offset(isOpen ? offset : .zero)
    }
}

// Allows short hand for adding two CGSizes together

func +(lhs: CGSize, rhs: CGSize) -> CGSize {
    CGSize(width: lhs.width + rhs.width, height: lhs.height + rhs.height)
}

Hi elislade, I'm getting a
Referencing operator function '+' on 'FloatingPoint' requires that 'CGSize' conform to 'FloatingPoint'
self.offset = self.tempOffset + g.translation

do you happen to know whats going on? Thank you

Sorry, I didn't include my custom CGSize operator. func +(lhs: CGSize, rhs: CGSize) -> CGSize { CGSize(width: lhs.width + rhs.width, height: lhs.height + rhs.height) }

Thanks for response elislade !! Now there's another error
self.offset.width = self.offset.width.clamp(0, 65)
self.offset.height = self.offset.height.clamp(-660, 0)
Value of type 'CGFloat' has no member 'clamp'
hope you can help again tyty!