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Commit9a7b776

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chore: improve performance of indeterminate spinner (#184)
A user reported a constant 10% CPU usage whilst the Cursor svg failed to load. It turns out unnecessarily tying a looping animation to some state in SwiftUI is a bad idea. If you want to render a looping animation that's not tied to some state, you should use the CoreAnimation framework. In this case, we use a `CABasicAnimation`.We leave the determinate spinner unmodified, as it by definition must be tied to some SwiftUI state.Before:![before](https://github.com/user-attachments/assets/aadd00bd-d779-456d-9a2a-d72e24b085b1)After:![after](https://github.com/user-attachments/assets/ca788653-fbb2-469b-8bc8-2c0e5361945f)
1 parentf8a5ca5 commit9a7b776

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1 file changed

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‎Coder-Desktop/Coder-Desktop/Views/CircularProgressView.swift

Lines changed: 67 additions & 25 deletions
Original file line numberDiff line numberDiff line change
@@ -8,45 +8,35 @@ struct CircularProgressView: View {
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varprimaryColor:Color=.secondary
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varbackgroundColor:Color=.secondary.opacity(0.3)
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@Stateprivatevarrotation=0.0
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@StateprivatevartrimAmount:CGFloat=0.15
13-
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varautoCompleteThreshold:Float?
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varautoCompleteDuration:TimeInterval?
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varbody:someView{
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ZStack{
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// Background circle
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Circle()
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.stroke(backgroundColor, style:StrokeStyle(lineWidth: strokeWidth, lineCap:.round))
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.frame(width: diameter, height: diameter)
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Group{
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iflet value{
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// Determinate gauge
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iflet value{
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ZStack{
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Circle()
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.stroke(backgroundColor, style:StrokeStyle(lineWidth: strokeWidth, lineCap:.round))
20+
2621
Circle()
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.trim(from:0, to:CGFloat(displayValue(for: value)))
2823
.stroke(primaryColor, style:StrokeStyle(lineWidth: strokeWidth, lineCap:.round))
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.frame(width: diameter, height: diameter)
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.rotationEffect(.degrees(-90))
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.animation(autoCompleteAnimation(for: value), value: value)
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}else{
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// Indeterminate gauge
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Circle()
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.trim(from:0, to: trimAmount)
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.stroke(primaryColor, style:StrokeStyle(lineWidth: strokeWidth, lineCap:.round))
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.frame(width: diameter, height: diameter)
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.rotationEffect(.degrees(rotation))
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}
27+
.frame(width: diameter, height: diameter)
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}else{
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IndeterminateSpinnerView(
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diameter: diameter,
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strokeWidth: strokeWidth,
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primaryColor:NSColor(primaryColor),
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backgroundColor:NSColor(backgroundColor)
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)
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.frame(width: diameter, height: diameter)
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}
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}
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.frame(width: diameter+ strokeWidth*2, height: diameter+ strokeWidth*2)
43-
.onAppear{
44-
if value==nil{
45-
withAnimation(.linear(duration:0.8).repeatForever(autoreverses:false)){
46-
rotation=360
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}
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}
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}
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}
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5242
privatefunc displayValue(for value:Float)->Float{
@@ -78,3 +68,55 @@ extension CircularProgressView {
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return view
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}
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}
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// We note a constant >10% CPU usage when using a SwiftUI rotation animation that
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// repeats forever, while this implementation, using Core Animation, uses <1% CPU.
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structIndeterminateSpinnerView:NSViewRepresentable{
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vardiameter:CGFloat
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varstrokeWidth:CGFloat
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varprimaryColor:NSColor
78+
varbackgroundColor:NSColor
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80+
func makeNSView(context _:Context)->NSView{
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letview=NSView(frame:NSRect(x:0, y:0, width: diameter, height: diameter))
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view.wantsLayer=true
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84+
guardlet viewLayer= view.layerelse{return view}
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letfullPath=NSBezierPath(
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ovalIn:NSRect(x:0, y:0, width: diameter, height: diameter)
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).cgPath
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90+
letbackgroundLayer=CAShapeLayer()
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backgroundLayer.path= fullPath
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backgroundLayer.strokeColor= backgroundColor.cgColor
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backgroundLayer.fillColor=NSColor.clear.cgColor
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backgroundLayer.lineWidth= strokeWidth
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viewLayer.addSublayer(backgroundLayer)
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letforegroundLayer=CAShapeLayer()
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foregroundLayer.frame= viewLayer.bounds
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foregroundLayer.path= fullPath
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foregroundLayer.strokeColor= primaryColor.cgColor
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foregroundLayer.fillColor=NSColor.clear.cgColor
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foregroundLayer.lineWidth= strokeWidth
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foregroundLayer.lineCap=.round
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foregroundLayer.strokeStart=0
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foregroundLayer.strokeEnd=0.15
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viewLayer.addSublayer(foregroundLayer)
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109+
letrotationAnimation=CABasicAnimation(keyPath:"transform.rotation")
110+
rotationAnimation.fromValue=0
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rotationAnimation.toValue=2* Double.pi
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rotationAnimation.duration=1.0
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rotationAnimation.repeatCount=.infinity
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rotationAnimation.isRemovedOnCompletion=false
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116+
foregroundLayer.add(rotationAnimation, forKey:"rotationAnimation")
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return view
119+
}
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func updateNSView(_:NSView, context _:Context){}
122+
}

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